Journal articles: 'Port filtering'

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Pratiwi, Dwi Nurmasari, and Denar Regata Akbi. "Penerapan Metode Filtering Video Streaming dan Malware Pada Jaringan Local Area Network." Techno.Com 17, no. 4 (2018): 384–94. http://dx.doi.org/10.33633/tc.v17i4.1820.

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Jaringan komputer adalah jaringan penghubung komputer yang akan memberikan akses pada aplikasi layanan. Video Streaming merupakan layanan yang dapat mengkonsumsi bandwidth besar sehingga menyebabkan layanan akses lainnya tidak mendapatkan bandwidth yang cukup. Selain itu jaringan LAN sangat rentan sekali akan dimasuki oleh malware yang membuat jaringan sering down dan tidak stabil.Oleh karena itu, diperlukan adanya pengamanan jaringan dan filtering layanan. Dengan memanfaatkan router mikrotik dengan filtering port firewall dapat meminimalisir terjadinya penyebaran malware dan mengurangi penggunaan bandwidth. Metode Penelitiann yang dilakukan dengan studi literatur, perancangan, impelentasi, analisa pengujian. Hasil pengujian performansi sebelum implementasi filtering port pada jaringan LAN menunujukkan nilai bandwidth 98,04 Mbits, Jitter 0,046 ms, dan Packet loss 0,3 ms. Sedangkan pengujian nilai QoS setelah penerapan filtering port menunjukkan hasil bandwidth 364 Mbits, Jitter 0,022, dan packet loss 0,047. Performansi lebih stabil dan menunjukkan kinerja yang baik pada implementasi filteirng port video streaming. Hasil pengujian kenaikan dan penurunan nilai performansi masih dalam standart rekomendasii ITU-T.

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Pratiwi, Dwi. "Penerapan Metode Filtering Video Streaming dan Malware Pada Jaringan Local Area Network." SISTEMASI 7, no. 3 (2018): 230. http://dx.doi.org/10.32520/stmsi.v7i3.354.

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Jaringan komputer adalah jaringan penghubung komputer yang akan memberikan akses pada aplikasi layanan. Video Streaming merupakan layanan yang dapat mengkonsumsi bandwidth besar sehingga menyebabkan layanan akses lainnya tidak mendapatkan bandwidth yang cukup. Selain itu jaringan LAN sangat rentan sekali akan dimasuki oleh malware yang membuat jaringan sering down dan tidak stabil.Oleh karena itu, diperlukan adanya pengamanan jaringan dan filtering layanan. Dengan memanfaatkan router mikrotik dengan filtering port firewall dapat meminimalisir terjadinya penyebaran malware dan mengurangi penggunaan bandwidth. Metode Penelitiann yang dilakukan dengan studi literatur, perancangan, impelentasi, analisa pengujian. Hasil pengujian performansi sebelum implementasi filtering port pada jaringan LAN menunujukkan nilai bandwidth98,04 Mbits, Jitter 0,046 ms, dan Packet loss 0,3 ms. Sedangkan pengujian nilai QoS setelah penerapan filtering port menunjukkan hasil bandwidth 364 Mbits, Jitter 0,022, dan packet loss 0,047. Performansi lebih stabil dan menunjukkan kinerja yang baik pada implementasi filteirng port video streaming. Hasil pengujian kenaikan dan penurunan nilai performansi masih dalam standart rekomendasi ITU-T.

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Muhammad Rifqi Maulana and Abdul Kholiq. "ANALISIS DAN IMPLEMENTASI KEAMANAN JARINGAN MIKROTIK DENGAN METODE IP FILTERING DAN PORT KNOCKIING ( STUDI KASUS BAROKAH.NET )." JURNAL LIMITS 19, no. 02 (2023): 71–80. http://dx.doi.org/10.59134/jlmt.v19i02.199.

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Keamanan jaringan pada server sangat penting, karena server adalah titik utama dalam penyaluran jaringan internet, jika keamanan jaringan lemah maka orang yang tidak berkepentingan dapat dengan mudah melakukan serangan terhadap server, baik untuk mendapatkan internet secara gratis atau merubah sistem pada server. Di Barokah.net sistem keamanan yang digunakan hanya pada login ke akses server dan menggunakan IP Static untuk identitas pada modem client, seiring berjalannya waktu di temukan ip address illegal yang muncul pada daftar IP ARP Mikrotik dan penyerangan menggunakan Brute Force yang terdeteksi pada Log sistem Mikrotik. Berfokus pada masalah tersebut penggunaan metode IP Filtering dan Port Knocking pada server utama merupakan cara yang tepat untuk meningkatkan sistem keamanan jaringan, dimana IP Filtering dan Port Knocking akan memberikan sebuah daftardan autentikasi khusus agar perangkat yang ingin mendapatkan akses ke server dapat di perbolehkan oleh server. Sehingga metode IP Filtering dan Port Knocking dapat meningkatkan keamanan jaringan pada Barokah.net.

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Liu, Yun, Sheng Sun, and Lei Zhu. "Design of n-Way Wideband Filtering Power Dividers With Good Port–Port Isolation." IEEE Transactions on Microwave Theory and Techniques 69, no. 7 (2021): 3298–306. http://dx.doi.org/10.1109/tmtt.2021.3072365.

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Qian, Zhenyao, Yuan Chen, Chunmei Feng, and Wei Wang. "Compact Multi-Mode Filtering Power Divider with High Selectivity, Improved Stopband and In-band Isolation." Applied Computational Electromagnetics Society 35, no. 8 (2020): 936–40. http://dx.doi.org/10.47037/2020.aces.j.350813.

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This letter presents a new compact multi-mode filtering power divider (FPD) design based on co-shared FPD topology with sharp frequency selectivity, improved out-of-band harmonic rejection and port-to-port isolation. Power splitting and quasi-elliptic filtering functions are achieved by masterly integrating only one triple-mode resonator. By loading different open-circuited stubs at the input/output ports, multiple additional transmission zeros (TZs) are generated at both lower and upper stopband, resulting in an improved stopband performance. Meanwhile, a better port-to-port isolation is obtained by adopting frequency-dependent resistor-capacitor parallel isolation network. The proposed multi-mode FPD design stands out from those in the literature by both nice operation performance and compact topology with only one resonator. For demonstration purposes, one triple-mode FPD prototype and its improved one are implemented, respectively. Measured results exhibit the superiority of the FPD design.

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Chen, Xun, Yi Wang, Talal Skaik, and Qingfeng Zhang. "E-Plane Waveguide Filtering Six-Port Junction." IEEE Transactions on Microwave Theory and Techniques 69, no. 12 (2021): 5360–70. http://dx.doi.org/10.1109/tmtt.2021.3120094.

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Cao, Ziheng, Yun Liu, Chen Liang, and Irfan Majid. "Design of UWB Filtering Impedance Transformers and Power Dividers Using Stepped-Impedance Resonators." Electronics 12, no. 13 (2023): 2800. http://dx.doi.org/10.3390/electronics12132800.

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This study presents a novel design of ultra-wideband (UWB) impedance transformers and power dividers with filtering capabilities. Based on the UWB impedance matching network, the UWB filtering impedance transformers are designed, and the UWB filtering power dividers are achieved by impedance transforming one port of one or more impedance transformers. The transformers consist of a multi-mode stepped-impedance resonator (SIR) and defected ground structures (DGSs). The SIR is tightly coupled to two ports of different impedance levels via the unsymmetrical two-sided coupled lines and DGSs. In addition, two transformers that convert impedance from 50 Ω to 100 Ω are connected to form a UWB power divider with filtering function. The 25 Ω port of an impedance transformer with a 50 Ω to 25 Ω conversion is impedance matched to two 50 Ω ports connected in parallel, resulting in another power divider with filtering function. Thus, two prototype UWB impedance transformers from 50 Ω to 100 Ω and from 50 Ω to 25 Ω are designed and their corresponding power dividers are also designed and fabricated. The simulated and measured results are consistent, demonstrating good features, such as return loss greater than 10 dB and insertion loss less than 4.5 dB in the passband, UWB filtering capacity with out-of-band rejection greater than 20 dB, and compact size smaller than 1.2λ × 2.1λ (λ is the wavelength of the central frequency).

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Ando, Ruo, Youki Kadobayashi, Hiroki Takakura, and Hiroshi Itoh. "Understanding Traffic Patterns of Covid-19 IoC in Huge Academic Backbone Network SINET." International Journal of Network Security & Its Applications 13, no. 6 (2021): 23–36. http://dx.doi.org/10.5121/ijnsa.2021.13603.

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Recently, APT (Advanced Persistent Threats) groups are using the COVID-19 pandemic as part of their cyber operations. In response to cyber threat actors, IoCs (Indicators of Compromise) are being provided to help us take some countermeasures. In this paper, we analyse how the coronavirus-based cyber attack unfolded on the academic infrastructure network SINET (The Science Information Network) based on the passive measurement with IoC. SINET is Japan's academic information infrastructure network. To extract and analyze the traffic patterns of the COVID-19 attacker group, we implemented a data flow pipeline for handling huge session traffic data observed on SINET. The data flow pipeline provides three functions: (1) identification the direction of the traffic, (2) filtering the port numbers, and (3) generation of the time series data. From the output of our pipeline, it is clear that the attacker's traffic can be broken down into several patterns. To name a few, we have witnessed (1) huge burstiness (port 25: FTP and high port applications), (3) diurnal patterns (port 443: SSL), and (3) periodic patterns with low amplitude (port 25: SMTP) We can conclude that some unveiled patterns by our pipeline are informative to handling security operations of the academic backbone network. Particularly, we have found burstiness of high port and unknown applications with the number of session data ranging from 10,000 to 35,000. For understanding the traffic patterns on SINET, our data flow pipeline can utilize any IoC based on the list of IP address for traffic ingress/egress identification and port filtering.

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Ruo, Ando, Kadobayashi Youki, Takakura Hiroki, and Itoh Hiroshi. "UNDERSTANDING TRAFFIC PATTERNS OF COVID-19 IOC IN HUGE ACADEMIC BACKBONE NETWORK SINET." International Journal of Network Security & Its Applications (IJNSA) 13, no. 6 (2021): 23–36. https://doi.org/10.5281/zenodo.5771310.

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Recently, APT (Advanced Persistent Threats) groups are using the COVID-19 pandemic as part of their cyber operations. In response to cyber threat actors, IoCs (Indicators of Compromise) are being provided to help us take some countermeasures. In this paper, we analyse how the coronavirus-based cyber attack unfolded on the academic infrastructure network SINET (The Science Information Network) based on the passive measurement with IoC. SINET is Japan's academic information infrastructure network. To extract and analyze the traffic patterns of the COVID-19 attacker group, we implemented a data flow pipeline for handling huge session traffic data observed on SINET. The data flow pipeline provides three functions: (1) identification the direction of the traffic, (2) filtering the port numbers, and (3) generation of the time series data. From the output of our pipeline, it is clear that the attacker's traffic can be broken down into several patterns. To name a few, we have witnessed (1) huge burstiness (port 25: FTP and high port applications), (3) diurnal patterns (port 443: SSL), and (3) periodic patterns with low amplitude (port 25: SMTP) We can conclude that some unveiled patterns by our pipeline are informative to handling security operations of the academic backbone network. Particularly, we have found burstiness of high port and unknown applications with the number of session data ranging from 10,000 to 35,000. For understanding the traffic patterns on SINET, our data flow pipeline can utilize any IoC based on the list of IP address for traffic ingress/egress identification and port filtering.

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Wicaksono, Dwiki. "Firewall Sistem Keamanan Jaringan Menggunakan Firewall dengan Metode Port Blocking dan Firewall Filtering." JATISI (Jurnal Teknik Informatika dan Sistem Informasi) 9, no. 2 (2022): 1380–92. http://dx.doi.org/10.35957/jatisi.v9i2.2103.

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Firewall merupakan bagian penting dalam suatu keamanan jaringan dimana akses lalu lintas internet banyak digunakan dalam dunia pendidikan maupun pekerjaan. Dalam hal ini firewall sangat diperlukan untuk mengatur akses lalu lintas internet agar melindungi system dari ancaman dan serangan dari luar. Penelitian ini membahas tentang sistem keamanan jaringan menggunakan firewall dengan metode port blocking dan firewall filtering. Penelitian ini menggunakan router Mikrotik dan aplikasi Winbox meremote router untuk membuat rule firewall. Rule firewall berisi blocking port komunikasi yang rawan terhadap serangan virus dan malware, dan pembatasan akses lalu lintas internet menggunakan web proxy dengan memblock situs http dan https dalam suatu jaringan. Hasil penelitian ini diuji menggunakan aplikasi Nmap untuk melihat sisa port komunikasi yang terbuka dan menggunakan browser untuk mengakses web situs yang dialihkan dan di block. Dengan memaksimalkan dan mengoptimalkan kinerja firewall sebuah jaringan internet akan lebih aman dan meminimalisir ancaman serangan dari luar.

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Song, Haitao, Feifei Zhang, and Baoxing Duan. "Wideband Dual-Polarized Filtering Antennas Using Short-Circuited Coupling Structure for 4G/5G Multi-Input-Multi-Output (MIMO) Antenna Decoupling Design." Photonics 12, no. 3 (2025): 259. https://doi.org/10.3390/photonics12030259.

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A short-circuited coupling structure (SCCS) is proposed to obtain a gain-filtering response for dual-polarized antennas. A conventional dipole is designed with two intrinsic radiation nulls. By introducing an SCCS, an additional radiation null is obtained, and the impedance bandwidth of an antenna can be further improved. Based on this design principle, two dual-polarized filtering antennas are designed for 4G and 5G wireless communication devices. The impedance bandwidth of the proposed 4G filtering antenna is 1.63–2.97 GHz (|S11| < −15 dB), with four radiation nulls at 1.1 GHz, 3.25 GHz, 3.5 GHz, and 4.0 GHz. The impedance bandwidth of the proposed 5G filtering antenna is 3.23–4.21 GHz (|S33| < −15 dB), with four radiation nulls at 1.7 GHz, 2.5 GHz, 3 GHz, and 4.6 GHz. Further, the decoupling function of the SCCS on 4G/5G MIMO antenna designs is also discussed. When introducing an SCCS, the port isolation levels of two elements between the 4G and 5G antennas, as well as the adjacent 5G antennas, can be improved by 14 dB and 6 dB, respectively. The port isolation levels of five elements between the 4G and 5G antennas, as well as the adjacent 5G antennas, can be improved by 15.2 dB and 9.5 dB, respectively. This technique could also be a potential candidate for optical antenna designs in optical front-ends and other multi-wavelength fiber lasers with microstructures.

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Lee, Boyoung, Jongheun Lee, Gyuwon Lee, and Juseop Lee. "All-Port-Reflectionless Narrowband Filtering Power Divider Topology With Generic Equations." IEEE Transactions on Circuits and Systems I: Regular Papers 69, no. 4 (2022): 1417–26. http://dx.doi.org/10.1109/tcsi.2021.3133585.

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Chang, Yen-Jen, and Hsiang-Yu Lu. "Improving the performance of port range check for network packet filtering." ACM Transactions on Design Automation of Electronic Systems 19, no. 1 (2013): 1–21. http://dx.doi.org/10.1145/2523069.

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Wang, Weimin, Yana Zheng, Yongle Wu, Zheng Zhuang, and Yuanan Liu. "Wide-Band Filtering Three-Port Coupler With Inherent DC-Blocking Function." IEEE Access 7 (2019): 13170–77. http://dx.doi.org/10.1109/access.2019.2892995.

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Xue, Han, Weicheng Zhang, Chao Ni, and Xiping Lu. "Cross Product and Partitioned Filtering-Based Graham Convex Hull for Buoy Drifting Area Demarcating." Scientific Programming 2021 (November 29, 2021): 1–9. http://dx.doi.org/10.1155/2021/7713884.

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An improved Graham scan convex hull algorithm is designed using the convex hull region shrinkage algorithm and the sample selection decision algorithm. In the sorting of Graham scan convex hull algorithm, the cross-multiplication method is used instead of the operation of finding the polar angle, which avoids the high computational complexity of finding the inverse trigonometric function. When the polar angles are the same, that is, the two points are collinear, the points close to each other are deleted directly. Select the maximal horizontal ordinate point, minimal horizontal ordinate point, maximal longitudinal coordinate point, and minimal longitudinal coordinate point. Connect these points and obtain lines. The whole plane is divided into different regions. The points that are not on the convex hull are deleted, and the redundant points are removed. This can speed up the calculation of approximate convex hull boundary and shorten the time of convex hull calculation. The proposed algorithm is used for buoy drifting area demarcating. The offsets of the geometric center of the high-frequency position point and the distance from geometric center of high-frequency position of buoy to sinking stone are calculated. The experimental results show that the new algorithm can effectively accelerate the convex hull calculation. We use the convex hull process to compute the area of the drifting buoy position and discover that the drift area of the port hand buoy is similar. The drift area of the port hand buoys is similar. The drift area of the port hand buoy is greater than that of the port hand buoy.

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Tommi Alfian Armawan Sandi, Firmansyah Firmansyah, Sari Dewi, Eka Kusuma Pratama, and Rachmawati Darma Astuti. "Comparison of Port Security Switch Layer 2 MAC Address Dynamic With MAC Address Static Sticky." Inspiration: Jurnal Teknologi Informasi dan Komunikasi 12, no. 2 (2022): 65–75. http://dx.doi.org/10.35585/inspir.v12i2.8.

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Security and stability in a network service is a top priority for a network administrator. The slightest security vulnerability can make a very big threat in the stability of network services. The rise of cybercrime that intercepts access to a network service by performing ARP spoofing to imitate a client who has the right to access the network, with this happening it can be detrimental and disrupt network services. The application of MAC Address filtering to access network services is able to minimize the occurrence of cybercrime in the network. The filtering technique used is by registering the MAC address of each network service user who will connect to the network. This technique is able to recap the MAC Address on each device in the MAC Address table and is able to block access to clients whose MAC addresses are not registered. The test results obtained for the comparison of MAC Address filtering security using Dynamic with sticky MAC addresses are that the implementation of port security static sticky is considered better than the implementation of dynamic port security, where if there is a new client trying to access the network and the client's mac address is not registered then the client absolutely does not get access to network services.

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Liu, Xin Ning, Shu Fang Lu, and Li Li Tan. "Design of Highly Efficient Self-Adaptive H.264 Loop Filter." Applied Mechanics and Materials 58-60 (June 2011): 567–72. http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.567.

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A highly efficient, single-port SRAM-based loop filter based on H.264 is presented. Hybrid edge filtering order, efficient memory organization for both on-chip SRAM and transposition buffers, and five-stage pipeline architect are adopted in the design. Efficient transposition buffer organization reduces the gate counts and the memory access times. By using hybrid edge filtering order and alternating output memory update scenario, zero stall cycle in pipeline flow is realized. To balance on-chip memory size and bus bandwidth, the design can be configured to operate in on-chip memory and off-chip memory modes.

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Zwain, Haider, and Naser Alkhafaji. "Design of Novel Filtenna for Wireless Applications." Al-Furat Journal of Innovations in Electronics and Computer Engineering 3, no. 2 (2024): 203–15. http://dx.doi.org/10.46649/fjiece.v3.2.15a.24.5.2024.

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In this paper, a novel design based on a dual-mode ring resonator, the filtering balun, feeding the printed dipole antenna, the filter balun antenna (FBA), is presented. One port on the structure allows the signals to be phase-shifted 180 degrees from one unbalanced port to two balanced signals. The suggested designs use a single dual-mode ring resonator to operate as both a filter and a balun at the same time. Compact designs are achieved by applying feeding to the second layer. Another unique characteristic of the filtering balun is its ability to alter, based on perturbation size, the phase error and magnitude imbalance of the two balanced signals. With the use of the Advanced Design System (ADS) software, numerous structures have been developed, modeled, and evaluated. To achieve the highest performance, every section of the design is assessed and optimized. Because the substrate is a lossy type (FR4), the realized transmission coefficients, which are poorer than expected ideal values, make the suggested design a strong contender for narrow-band wireless applications. For S2,1 and S3,1, the signal is routed through two viasand fed into a dipole antenna in the opposite phase by employing the zero iteration for filtering the balun in the first layer to condense with the second layers. The antenna structure is a printed dipole antenna operating at 2.4 GHz

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Idwar, Faisal, Sahriar Hamza, and Junaidi Noh. "SISTEM KEAMANAN JARINGAN KOMPUTER MENGGUNAKAN METODE MAC FILTERING DENGAN WEB PROXY DAN MANAJEMEN BANDWIDTH DI SMA NEGERI 6 KOTA TERNETE." Jurnal Teknik Informatika (J-Tifa) 7, no. 2 (2024): 7–16. http://dx.doi.org/10.52046/j-tifa.v7i2.2227.

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Pada zaman modern seperti sekarang ini, perkembangan Teknologi Informasi (TI) sangat pesat, dibuktikan dengan semakin canggihnya dunia Teknologi Informasi dari waktu ke waktu. Dengan semakin canggihnya Teknologi Informasi saat ini memberikan kemudahan pada manusia dalam berkomunikasi. Jaringan komputer digunakan hampir semua orang tanpa terkecuali para Craker. Adanya maksud dan tujuan tertentu Cracker melakukan penyusupan melalui port-port yang terdapat pada jaringan sehingga dapat merugikan pemilik server dan jaringan komputer. Banyak organisasi menggunakan jaringan komputer untuk saling bertukar informasi dalam bentuk data, suara, video, dan masih banyak lagi.Dalam sebuah jaringan komputer, perangkat jaringan router memiliki fungsi sebagai firewall yang dapat digunakan untuk mengimplementasikan kebijakan keamanan di jaringan (site security policy) seperti saat pengguna melakukan aksi tertentu yang tidak diperbolehkan, maka firewall akan menggagalkan dan menolak aksi tersebut. Firewall juga memiliki fungsi sebagai filtering yang mewajibkan semua traffic yang berupa kumpulan data untuk disaring sesuai IP address dan nomor port sesuai kebijakan keamanan atau security.Upaya pengaturan bandwidth pun dibutuhkan agar penggunakan internet lebih baik, cepat akses, efektif dan efesien. Persyaratan tersebut ada pada sistem operasi mikrotik yang ditunjang dengan filtering web Menurut Sukridan Jumiati (2017:244) menyimpulkan bahwa “Jaringan internet yang ada saat ini dibeberapa tempat sering kali terjadi adanya dominasi bandwidth antar client yang diakibatkan salah satu atau beberapa client melakukan download sehingga akan mengganggu client lain. Untuk mengatasi permasalahan dominasi bandwidth yang terjadi, akan dilakukanlah pembagian bandwidth Dengan memanfaatkan router

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Šabanovič, Aleksandr, Jonas Matijošius, Dragan Marinković, et al. "Experimental Setup and Machine Learning-Based Prediction Model for Electro-Cyclone Filter Efficiency: Filtering of Ship Particulate Matter Emission." Atmosphere 16, no. 1 (2025): 103. https://doi.org/10.3390/atmos16010103.

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Ship emissions significantly impact air quality, particularly in coastal and port regions, contributing to elevated concentrations of PM2.5, and PM10, with varying effects observed across different locations. This study investigates the effectiveness of emission control policies, inland and port-specific contributions to air pollution, and the health risks posed by particulate matter (PM). A regression discontinuity model at Ningbo Port revealed that ship activities show moderate PM2.5 and PM10 variations. In Busan Port, container ships accounted for the majority of emissions, with social costs from pollutants estimated at USD 31.55 million annually. Inland shipping near the Yangtze River demonstrated significant PM contributions, emphasizing regional impacts. Health risks from PM2.5, a major global toxic pollutant, were highlighted, with links to respiratory, cardiovascular, and cognitive disorders. Advances in air purification technologies, including hybrid electrostatic filtration systems, have shown promising efficiency in removing submicron particles and toxic gases, reducing energy costs. In this paper, a random forest machine learning model developed to predict particulate concentrations post-cleaning demonstrated robust performance (MAE = 0.49 P/cm3, R2 = 0.97). These findings underscore the critical need for stringent emission controls, innovative filtration systems, and comprehensive monitoring to mitigate the environmental and health impacts of ship emissions.

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Wong, Yuk Shing, Shao Yong Zheng, and Wing Shing Chan. "MULTIFOLDED BANDWIDTH BRANCH LINE COUPLER WITH FILTERING CHARACTERISTIC USING COUPLED PORT FEEDING." Progress In Electromagnetics Research 118 (2011): 17–35. http://dx.doi.org/10.2528/pier11041401.

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Ramakrishnan, Bhakkiyalakshmi, and Vasanthi Murugiah Sivashanmugham. "Novel four-port reconfigurable filtering MIMO antenna for multi-standard automotive communications." AEU - International Journal of Electronics and Communications 146 (March 2022): 154108. http://dx.doi.org/10.1016/j.aeue.2022.154108.

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De Gasperis, P., C. Di Gregorio, R. Marcelli, and G. Miccoli. "Passband filtering of magnetostatic volume waves in two-port planar garnet devices." IEEE Transactions on Magnetics 21, no. 5 (1985): 1791–93. http://dx.doi.org/10.1109/tmag.1985.1064127.

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Wang, Yucheng, Fei Xiao, Yu Cao, Yong Zhang, and Xiaohong Tang. "Novel Wideband Microstrip Filtering Power Divider Using Multiple Resistors for Port Isolation." IEEE Access 7 (2019): 61868–73. http://dx.doi.org/10.1109/access.2019.2913093.

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Zulfikri, Achmad, Fauzan Prasetyo Eka Putra, Moh Abroril Huda, Hasbullah Hasbullah, Mahendra Mahendra, and Miftahus Surur. "Analisis Keamanan Jaringan Dari Serangan Malware Menggunakan Filtering Firewall Dengan Port Blocking." Digital Transformation Technology 3, no. 2 (2023): 857–63. http://dx.doi.org/10.47709/digitech.v3i2.3379.

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Jaringan komputer memiliki peranan penting dalam kegiatan belajar mengajar di sekolah, akan tetapi adapula dampak negatif yang ditimbulkan. Salah satunya rawan di serang oleh malware seperti virus dan lain sebagainya. Berdasarka permasalahan tersebut maka dilakukan penelitian yang bertujuan untuk mengatasi permasalahan-permasalahan disebabkan oleh penyebaran malware yang terdapat dalam jaringan. Salah satu dampak adanya malware dalam jaringan kampus adalah overload traffic bandwidth, sehingga menyebabkan kendala bandwidth yang cepat habis atau lalu lintas transfer data baik yang masuk maupun yang keluar menjadi lambat dari biasanya. Umumnya sebuah kampus atau universitas memiliki struktur jaringan yang didalamnya dikelola oleh satu atau lebih router di dalam mengelola jaringan dan bandwidth. Beberapa router memiliki kemampuan pengaturan firewall yang sudah cukum mumpuni namun perlu dikelola lebih spsesifik berdasarkan kebutuhan skala jaringan dan bandwidth yang tersedia. Dengan menciptakan rule-rule yang baik di dalam firewall akan lebih mudah dalam melakukan filtering terhadap lalu lintas trafik jaringan dan bandwidth sehingga dapat menciptakan keamanan dan kenyamanan pengguna jaringan dan bandwidth. Hasil penelitian ini menunjukkan kinerja dari mikrotik router board RB 1100 AHx2 yang dapat memfilter aktivitas malware dengan rule yang telah ditanamkan

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Nurfaishal, Muhammad Dzaky, and Yuma Akbar. "Analisis Efektivitas Keamanan Jaringan Layer 2: Port Security, VLAN Hopping, DHCP Snooping." Jurnal Indonesia : Manajemen Informatika dan Komunikasi 5, no. 3 (2024): 3278–90. http://dx.doi.org/10.35870/jimik.v5i3.975.

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In the industrial era 4.0, which is marked by the rapid progress of computer networks and the internet, network security at Layer 2 is part of the Data Link Layer in the OSI model, which is very important considering the increasing number of cyber threats. This research aims to compare the effectiveness of various security algorithms applied to Layer 2 switches, namely MAC Address Filtering with Port Security, VLAN Hopping Mitigation, and DHCP Snooping. Some of these methods have the function or purpose of creating MAC address filtering, port limitations, VLAN protection, ARP, etc. The device used to conduct this research is a Cisco Switch. This research uses an experimental approach by implementing each method in different network scenarios and comparing it with external data, measuring effectiveness based on attack detection and prevention, as well as its impact on network performance, then combining several of these methods into one scope. The results show that each method has its own advantages and disadvantages, which function to block various types of attacks such as Flooding, Snooping, and Rogue DHCP. It is highly recommended to combine all security methods into one integrated system.

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Zhang, Siran, Hongmei Liu, Shuyi Chen, Zhongbao Wang, and Shaojun Fang. "Synthesis of Wideband All-Frequency Absorptive Filtering Power Divider with High Selectivity and Flat Output Port Distributions." Electronics 12, no. 17 (2023): 3704. http://dx.doi.org/10.3390/electronics12173704.

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In this paper, a wideband absorptive filtering power divider (AFPD) which features the characteristics of high selectivity and flat output distributions is proposed. It is composed of one unequal width three-coupled line (TCL), two coupled lines (CLs), two stepped open-circuited stubs, two kinds of isolation resistors, and two types of absorptive branches. The design equations of the proposed AFPD are derived using an even-odd decomposition method, and parametric investigations are also performed. It is found that the passband bandwidth can be adjusted by the stepped open-circuited stub which generates two transmission zeros (TZs). By combining the TCL with the CLs, the passband bandwidth is effectively enlarged. In addition, two isolated resistors are utilized for achieving good isolation and output-port matching performance. Without affecting the passband responses, the input port absorptive feature within the whole frequency band can be obtained by loading the absorptive branches both on the input and output ports. For validation, an example operating at the center frequency of 2 GHz was modeled and tested. Results exhibit that the passband FBW reaches 72% under 1 dB criterion, which illustrates flat output port distributions. In addition, for 10 dB return loss, the input and output impedance matching bandwidths are 250% and 78%, respectively. The features of good filtering responses are demonstrated by realizing the rectangle coefficient of 1.24 and the out-of-band suppression of more than 20 dB.

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Chen, Yuxu, Mingwei Liu, Zhiqi Ao, Zhongkai Fan, and Zhuqing Liu. "Design of Grid Communication Data Gateway Filtering System Based on Microservice Architecture." Journal of Physics: Conference Series 2404, no. 1 (2022): 012036. http://dx.doi.org/10.1088/1742-6596/2404/1/012036.

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Abstract The grid communication data gateway filtering system has the problem of excessive memory overhead, so a grid communication data gateway filtering system based on micro-service architecture is designed. For the hardware part, the system can support mounting a U disk with a capacity of 16 G and above and use NAND FLASH to realize the expansion of solidified code and storage space. For the software part, the system can get the gateway communication parameters, calculate the bit rate of grid communication data transmission, and match a specific duty cycle. Besides, it can set the existing network port authentication mode according to the instructions, start the gateway filtering program, design the power grid communication data reliability judgment rule base, and optimize the filtering mode based on the micro-service architecture. The test results are that under the conditions of a different number of sensitive words, the average memory overhead of the designed system is 75.93 MB, indicating that the system has better overhead performance under the influence of the microservice architecture.

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Suhardono, Dovan, Bongga Arifwidodo, and Eka Wahyudi. "Teknik Keamanan Akses Internet Untuk Parenting Menggunakan Metode Packet Filtering Pada Mikrotik." Techno.Com 22, no. 4 (2023): 926–36. http://dx.doi.org/10.33633/tc.v22i4.9137.

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APJII melangsir data pada tahun 2021-2022 bahwa pengguna internet terus meningkat sebesar 77,02%. Kelompok usia 13 hingga 18 tahun merupakan data tertinggi pengguna akses internet. Sangat disayangkan usia tersebut pada dasarnya belum mengerti dampak dari pesatnya teknologi internet. Sehingga orang tua merupakan pengawas utama bagi anak saat menggunakan akses internet. Salah satu metode keamanan akses internet adalah metode packet filtering. Penelitian ini menggunakan metode packet filtering pada perangkat jaringan mikrotik kemudian menghasilkan notifikasi ketika terjadi pelanggaran. Informasi notifikasi akan diterima oleh administrator system melalui Telegram. Skenario penelitian ini menggunakan konfigurasi packet filtering dengan memasukkan alamat IP atau nomor port yang akan diblokir serta konfigurasi ke Telegram sebagai penerima notifikasi. Secara umum penelitian ini menunjukkan keberhasilan pemblokiran terhadap beberapa situs dan game online, serta memperoleh hasil waktu respon notifikasi dari bot Telegram yang lambat, dengan rata-rata sebesar 26,9 detik untuk media sosial dan 23,3 detik untuk game online

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Luo, Tuo, Pinqun Jiang, Guoxian Huang, and Dong Lin. "Design and simulation of low-ripple dual active bridge DC-DC converter." Journal of Physics: Conference Series 2803, no. 1 (2024): 012058. http://dx.doi.org/10.1088/1742-6596/2803/1/012058.

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Abstract In addressing the issue of excessive high-frequency current ripple at the output port caused by high-frequency switching in traditional dual active bridge DC-DC converters, a low-ripple dual active bridge DC-DC converter was designed by replacing its switching devices with a half-bridge submodule. This converter constructs a decoupling loop for alternating and direct current components on the bridge arms, allowing the alternating components to form a loop between the bridge arms without entering the direct current port, thereby eliminating high-frequency current ripple at the direct current output port. Consequently, the filtering capacitors parallel to the direct current port can be omitted, while also suppressing direct current fault currents. Due to the inherent capacitance structure of the submodule switching devices, soft-switching characteristics are preserved, and conversion efficiency is not compromised. Simulation results based on a MATLAB/Simulink model of 750 V and 10 kW demonstrate that the ripple of this converter is less than 0.07%, a 90% reduction compared to traditional converters, and effectively suppresses fault currents, thereby enhancing system safety.

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Lin, Xian-Jing, Ze-Ming Xie, and Pei-Sheng Zhang. "Integrated Filtering Microstrip Duplex Antenna Array with High Isolation." International Journal of Antennas and Propagation 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/4127943.

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This paper presents a 2 × 1 integrated filtering microstrip duplex antenna array with high isolation and same polarization. The antenna consists of two radiating patches fed by two T-shaped probes and a power distributing duplex network (PDDN). The PDDN is composed of two bandstop filters and a 180-degree phase shift power divider. And the PDDN is designed to achieve the functions of power division, frequency selectivity, and port isolation. A Transmission Line (TL) model is adopted to design the PDDN, and the detailed synthesis procedure is presented. For demonstration, the proposed antenna is designed and fabricated. The implemented antenna achieves an average gain of 10 dBi, a cross-polarization ratio of 20 dB, and an isolation of 35 dB within the operation band.

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Dong, Gaoya, Weimin Wang, Bo Zhang, and Yuanan Liu. "Wideband filtering power dividers with wide stopband rejection." International Journal of Microwave and Wireless Technologies 11, no. 1 (2018): 7–14. http://dx.doi.org/10.1017/s1759078718001459.

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AbstractA series of novel wideband filtering power dividers (WFPDs) with wide stopband rejection performances is proposed in this paper. The proposed WFPD structure consists of a parallel-coupled line, two transmission line (TL) sections, four loading terminations, and an isolation resistor. The coupled line is applied at the input port to provide wideband impedance transformation, while different types of loading terminations and TL sections are adopted to realize various out-of-band rejection performances. To verify the proposed concepts, three WFPDs operating at 3.0 GHz are designed and fabricated with 3 dB bandwidth of 79.7, 79.0, and 74.4%. In WFPD1, the measured out-of-band rejection of better than 13.4 dB extends to 2.57f0. Moreover, the measured out-of-band rejection of better than 17 dB extends to 2.47f0 (4.75f0) in WFPD2 (WFPD3), respectively. Good agreements between the simulated and measured results validate the presented ideas.

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Maulana, Muhammad Sony, and Muhammad Ryansyah. "Malware Security Menggunakan Filtering Firewall Dengan Metode Port Blocking Pada Mikrotik RB 1100AHx2." Jurnal Sistem dan Teknologi Informasi (JUSTIN) 6, no. 3 (2018): 112. http://dx.doi.org/10.26418/justin.v6i3.26716.

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Penelitian ini bertujuan untuk mengatasi permasalahan penyebaran malware yang terdapat dalam jaringan kampus. Salah satu dampak adanya malware dalam jaringan kampus adalah overload traffic bandwidth, sehingga menyebabkan kendala bandwidth yang cepat habis atau lalu lintas transfer data baik yang masuk maupun yang keluar menjadi lambat dari biasanya. Umumnya sebuah kampus atau universitas memiliki struktur jaringan yang didalamnya dikelola oleh satu atau lebih router di dalam mengelola jaringan dan bandwidth. Beberapa router memiliki kemampuan pengaturan firewall yang sudah cukum mumpuni namun perlu dikelola lebih spsesifik berdasarkan kebutuhan skala jaringan dan bandwidth yang tersedia. Dengan menciptakan rule-rule yang baik di dalam firewall akan lebih mudah dalam melakukan filtering terhadap lalu lintas trafik jaringan dan bandwidth sehingga dapat menciptakan keamanan dan kenyamanan pengguna jaringan dan bandwidth.

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Stepanishen, Peter R. "Wave‐vector‐frequency filtering characteristics of multilayer plate systems via two‐port methods." Journal of the Acoustical Society of America 78, S1 (1985): S53. http://dx.doi.org/10.1121/1.2022866.

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Chen, Wang, Gang Zhang, Shicheng Liu, and Jiquan Yang. "Synthesis of Multi-Port Filtering Power Divider for Mixed Topology Using Matrix Optimization." IEEE Transactions on Circuits and Systems II: Express Briefs 68, no. 1 (2021): 176–80. http://dx.doi.org/10.1109/tcsii.2020.3007217.

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Liu, Wei, Laisheng Zhang, and Fan Zhang. "Performance Analysis of Three-Wavelength Multi-Channel Photonic Crystal Filters of Different Sizes." Crystals 12, no. 1 (2022): 91. http://dx.doi.org/10.3390/cryst12010091.

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Multi-wavelength and multi-channel photonic crystal filters are designed with different sizes considered by using a two-dimensional quadric lattice photonic crystal structure to solve the problems of a multi-channel filter with structure complexity, single-wavelength download, and channel interference. The designed filter consists of a waveguide, reflection wall, multimode microcavity, and output port. Each port can download three different wavelengths. In the communication band from 1.500 to 1.600 μm, the transmittance of each channel is greater than 90%, and the filtering efficiency is high. The size of the non-simplified filter is only 27 μm × 17 μm. On the premise of ensuring low loss transmittance (that is, the transmittance of each port is changed by no more than 10% at the wavelength from 1.5–1.6 μm), the size of the filter can reach 15 μm × 7 μm. This design will greatly reduce the overall structure size of the filter and is suitable for multiplexing and demultiplexing in WDM systems.

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37

Schlonsak, Ruben, Jan-Philipp Schreiter, and Horst Hellbrück. "Bridge Detection in Autonomous Shipping: A YOLOv8 Approach with Autodistill and GroundedSAM." Journal of Physics: Conference Series 2867, no. 1 (2024): 012019. http://dx.doi.org/10.1088/1742-6596/2867/1/012019.

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Abstract Inland waterway transportation remains a crucial and cost-effective mode of global transport despite challenges such as skilled personnel shortages, increasing competition, and ecological impacts. Autonomous technology enhances vessel navigation, scheduling, safety, and efficiency, making it a viable solution for smart ship and port operations. Reliable object detection is essential for autonomous ships to navigate safely and avoid collisions with static structures like bridges, piers, bollards, and locks. This paper presents an innovative approach for training a network using the Autodistill pipeline for bridge detection and segmentation. We generate a labeled bridge dataset using GroundedSAM, which integrates Grounding DINO and the Segment Anything Model (SAM) to detect and segment regions based on text input. The system focuses on identifying ‘bridge’ and ‘water’ classes, producing high-quality labeled data. Manual filtering improves label quality, enhancing the training of the YOLOv8 model, known for its superior object detection capabilities. Our approach demonstrates high performance in accurately detecting bridges, confirmed through evaluations with and without manual filtering. To validate our solution’s feasibility in real-world applications, we deployed the model on a NVIDIA Jetson AGX Orin for performance evaluation. Future work will extend this approach to additional static and mobile objects relevant to smart ship and port operations, such as ship locks and various ship types.

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Ye, Hongquan. "FPGA-based Serial Port-controlled Frequency Adjustable Waveform Generator." Applied Science and Innovative Research 7, no. 4 (2023): p182. http://dx.doi.org/10.22158/asir.v7n4p182.

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This article explores the design, optimization, and applications of FPGA-based Direct Digital Synthesis (DDS) waveform generators. The DDS technology is widely used in signal generation and processing and is favored for its flexibility and precision. The paper discusses performance optimization strategies, focusing on enhancing frequency resolution, waveform quality, and phase accumulation speed. Suggestions include increasing phase accumulator’s bit width, optimizing the size of the phase lookup table, introducing frequency interpolation, and employing fast accumulation algorithms. Additionally, it delves into more applications such as high-precision testing, high-speed communication systems, multi-channel data synchronization, and multi-waveform outputs. The conclusion emphasizes the ongoing need for performance improvements and application advancements. Future directions include exploring higher-precision phase lookup table designs, sophisticated filtering, efficient accumulation algorithms, and leveraging advanced FPGA chips for broader application scope. Overall, FPGA-based DDS waveform generators exhibit significant potential across various domains, promising enhanced signal accuracy and adaptability.

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K.Ray, G. Singh, Nhat Truong Pham, P. Hakaew, P. Prabpal, and P. Yupapin. "All-optical Noise-free Circuit using Silicon Nonlinear Kerr Effect Space-Time Distortion Control." Journal of Industrial Technology and Innovation 1, no. 1 (2022): 246557. http://dx.doi.org/10.55674/snrujiti.v1i1.246557.

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A silicon microring resonator system designed for the optical noise-free circuit consists of a silicon microring with two nanorings at its sides and has the form of a Panda-ring resonator. From which the nonlinear Kerr effect is introduced for space-time distortion control. Firstly, the input light (bright soliton) of 1.50 m center wavelength fed into the system with suitable parameters. The space signal with three types of noise (white, blue- and pink) fed into the system for manipulation. Secondly, the controlled space-time signals multiplexed into the circuit via the add port, the successive filtering employed for noisy space-time signal filtering. The optimum space-time distortion formed by the space-time uncertainty saturation, where the squeezing of light was produced and the whispering gallery mode obtained. The novelty of this work is the use of the Pandaring circuit successive filtering with the space-time distortion control based on the circuit's nonlinear Kerr effect, which can achieve the optical noise-free circuit requirement. By using the Optiwave and MATLAB programs, the simulation results obtained. Results were plotted in time, frequency, and wavelength domains, respectively. The selected modulation time signal is femtosecond (fs), in which the noisy signals extracted from the resonant successive filtering signals.

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Xu, Yongping, Chaoyi Sun, Zhe Chen, et al. "Dual-Band Gysel Filtering Power Divider with a Frequency Transform Resonator and Microstrip/Slotline Phase Inverter." Electronics 14, no. 1 (2024): 61. https://doi.org/10.3390/electronics14010061.

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This paper presents a novel dual-band Gysel filtering power divider (FPD) with an excellent isolation performance and a significantly wide isolation bandwidth. Although Gysel power dividers have been extensively studied in the field of radio frequency (RF), the integration of filtering functionality and the expansion of isolation bandwidth remain challenging. The proposed design addresses these challenges by incorporating frequency transform resonators (FTRs) and a microstrip/slotline (M/S) phase inverter into the classic Gysel topology. The FTR is directly connected to the output port to provide a dual-band response, enabling the Gysel FPD to operate without external coupling between the resonator and the port. The M/S phase inverter is a dual-layer 180° phase shifter, designed to replace the conventional 180° transmission lines loaded between the two isolation resistors of the Gysel FPD, achieving a wide isolation bandwidth. To validate the proposed design method, a dual-band Gysel FPD with center frequencies of 1.4 GHz and 1.7 GHz is designed, fabricated, and measured. The measured results show that the in-band return loss is greater than 20 dB, and the in-band insertion loss is about 0.6 dB, and the amplitude and phase imbalance characteristics are good. In addition, the 20 dB-isolation fractional bandwidth achieves 97% (0.78–2.25 GHz). The measured results show excellent agreement with the simulation results, validating the effectiveness of the proposed design methodology.

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Xiaoning Ye and J. L. Drewniak. "FDTD modeling incorporating a two-port network for I/O line EMI filtering design." IEEE Transactions on Electromagnetic Compatibility 44, no. 1 (2002): 175–81. http://dx.doi.org/10.1109/15.990724.

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NUSANTARA, HARDI, ARIEF BUDI SANTIKO, and ACHMAD MUNIR. "Filtering Power Divider menggunakan Filter SIW untuk Aplikasi WLAN 5,8 GHz." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 9, no. 3 (2021): 703. http://dx.doi.org/10.26760/elkomika.v9i3.703.

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ABSTRAKDalam makalah ini dikembangkan sebuah pembagi daya yang terintegrasi dengan proses filtering yang dinamakan Filtering Power Divider (FPD) untuk mendapatkan ukuran perangkat yang compact. FPD yang diusulkan terdiri dari 2 buah Band Pass Filter (BPF) yang dirancang berdasarkan teknik Substrate Integrated Waveguide (SIW) untuk beroperasi pada frekuensi Wireless Local Area Network (WLAN) 5,8 GHz. Optimasi dilakukan dengan menggunakan sebuah perangkat lunak simulasi untuk menyelidiki pengaruh parameter filter yang berbeda terhadap proses pemfilteran serta tanggapan keluaran FPD. Substrat dielektrik Duroid 5880 dengan ketebalan 1,575 mm digunakan untuk merealisasi FPD dengan total dimensi 95 mm x 70 mm. FPD yang direalisasi memiliki tanggapan bandwidth sebesar 75 MHz pada rentang frekuensi 5,9 GHz hingga 5,975 GHz dan isolasi antar port keluaran sebesar 20 dB.Kata kunci: Band Pass Filter (BPF), filtering power divider, Substrate Integrated,Waveguide (SIW), Wireless Local Area Network (WLAN).ABSTRACTIn this paper power divider integrated with filtering process, named as Filtering Power Divider (FPD), is developed to achieve a compact size of the device. The proposed FPD is composed of 2 pieces of Band Pass Filter (BPF) designed based on Substrate Integrated Waveguide (SIW) to operate at the Wireless Local Area Network (WLAN) frequency of 5.8 GHz. The optimizations are carried out using a simulation software to investigate the effect of different filter parameters to the filtering process as well as to the output response of FPD. A Duroid 5880 dielectric substrate with the thickness of 1.575 mm is used to realized the FPD with the total dimensions of 95 mm x 70 mm. The realized FPD has a bandwidth response of 75 MHz in the frequency range of 5.9 GHz to 5.975 GHz and isolation between output ports is 20 dB.Keywords: Band Pass Filter (BPF); filtering power divider; Substrate Integrated Waveguide (SIW); Wireless Local Area Network (WLAN).

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Paquette, Alexandre, Joël Griesmar, Gabriel Lavoie, et al. "Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling." Applied Physics Letters 121, no. 12 (2022): 124001. http://dx.doi.org/10.1063/5.0114887.

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We present an efficient fabrication method for absorptive microwave filters based on Eccosorb CR-124. Filters are fabricated from readily available parts, and their cutoff frequency can be set by their length. They exhibit desirable properties such as a very large and deep stop band with rejection beyond 120 dB at least up to 40 GHz, more than 10 dB return loss in both the pass and the stop band, and an error-function shaped step response without overshoot. Measurements at very low temperatures show that the filters thermalize on a time scale of approximately 100 s, and that they can absorb power as high as 100 nW with their noise temperature staying remarkably low, below 100 mK. These properties make the filters ideal for cryogenic filtering and filtering of intermediate frequency port signals of mixers.

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Rizvi, Syed Naheel Raza, Md Abu Sufian, Wahaj Abbas Awan, Young Choi, Niamat Hussain, and Nam Kim. "A closely spaced two-port MIMO antenna with a radiation null for out-of-band suppressions for 5G Sub-6 GHz applications." PLOS ONE 19, no. 7 (2024): e0306446. http://dx.doi.org/10.1371/journal.pone.0306446.

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This paper presents the design and isolation enhancement of a filtering MIMO antenna with a radiation null for out-of-band suppressions suited for 5G sub-6 GHz communications. The MIMO antenna offers -10 dB impedance bandwidth functionality at the most prominent partial spectrum of the 5G NR n78 band for enabling wireless applications in base stations, ranging from 3.4 GHz to 3.61 GHz. To mitigate the redundancy of an RF filter and to achieve a strong filtering response, a radiation null is produced in the gain with four identical rectangular slots, which results in a significant gain drop of more than 8 dBi at the stopband. The geometrical design also allows 30 percent size reduction of single element. Subsequently, a closely spaced (0.11λ0) two-port MIMO antenna is implemented and with the utilization of the proposed rectangular shaped hollow stub parasitic element, the interelement isolation is significantly improved by more than 8 dB over the operational frequency range while retaining the filtering without any additional RF structure. The design simplification, peak gain of 5.4 dBi, near ideal response of diversity gain, ECC less than 0.03, congruency between simulated and measured results, and stable parameters make it a valuable choice for 3.5 GHz sub-6 GHz communications.

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Han, Xiao Min, Jian Min Wang, and Cong Cong Wang. "Ultrasonic Slurry Concentration Meter Design." Applied Mechanics and Materials 385-386 (August 2013): 488–91. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.488.

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This design is based on the theory of ultrasonic attenuation,design of pulp concentration is C8051F021 microcontroller as the core of the meter, And contains the ultrasonic transmitting circuit, receiving circuit, the power amplification circuit, detection shaping circuit, LCD display circuit, 485 communication circuit. In addition to the data processing by appropriate filtering software, shield the noise and clutter signal, the rich information of real-time display, and the measurement of data transmission in serial port to a PC through the analysis and comparison.

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Kabala, Piotr, and Dariusz Laskowski. "Analysis of Network Traffic Filtering / Analiza Filtracji Ruchu Sieciowego." Journal of KONBiN 33, no. 1 (2015): 41–60. http://dx.doi.org/10.1515/jok-2015-0004.

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Abstract The article consist of study on concept of Network Obstacle (firewall, FW) using PLD-Linux platform and available tools, implementation selected mechanism of security, also analysis the effectiveness of prepared Network Obstacle. Study on concept of Network Obstacle is based on Screened Subnet architecture. Testing effectiveness of network Obstacle was found in two fundamental parts. In the first part was examining the security of network obstacle, testing the resistance attempts of scanning port and the most common attacks. The second part of the research meant to show the influence of the Network Obstacle on time and delay of the realization of transaction for HTTP movement depending on level of the security and movement intensity generated by internal network users. Testing the effectiveness of FW was verify by testing the resistance in an attempt of scanning ports and attacks refusal of service (ICMP, SYN Flood), providing base of dispersed attacks DDoS. This part of the research had one aim, to show the influence FW on time and on delay of the realization the transaction for motion HTTP, depending on the security level and intensity of movement generated by the users of the internal network.

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Fang, Xinyu, Xiaowei Yao, Jing Xie, and Dun Liu. "Application of Kalman filter in wharf surface displacement of Beidou automatic monitoring." Journal of Physics: Conference Series 2621, no. 1 (2023): 012007. http://dx.doi.org/10.1088/1742-6596/2621/1/012007.

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Abstract To meet the requirements for real-time dynamic monitoring of wharf surface displacement, an automatic monitoring system based on Beidou satellite navigation was constructed, and it was applied to monitor the surface displacement of a wharf in Tianjin Port. Next, the sensible system noise of the Kalman filter state equation was determined by the simulation experiment. Finally, the monitoring data were processed and analyzed by Kalman filter. The results show that the accuracy of the monitoring data can be improved by more than 30% by Kalman filtering, particularly the elevation direction accuracy can reach more than 40%. The plane and elevation accuracy can be less than 1.5mm, after the Beidou automatic monitoring data has been processed by Kalman filtering, and this meets the needs for most engineering deformation monitoring. In a word, the Beidou automatic monitoring system is characterized by continuity, real-time and high precision, and can be applied to most engineering deformation monitoring requirements.

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Wu, Zeyu, Zihao Chen, and Kaixu Wang. "A Novel Compact Gysel Power Divider with Bandpass Filtering Responses." Electronics 12, no. 17 (2023): 3578. http://dx.doi.org/10.3390/electronics12173578.

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This study presents a novel compact design of the Gysel topology and a filtering power divider (FPD) that utilizes a coupling structure. The proposed design replaces the traditional four-quarter wavelength transmission lines of the Gysel power divider with transmission lines and lumped components, resulting in a significantly reduced circuit size. Furthermore, the introduction of this coupling structure ensures the integration of the filtering and power division functions. Two transmission zeros are created near the passband to enhance the frequency selectivity of the responses. Theoretical analysis is carried out, and closed-form equations are derived based on the even–odd-mode method. To validate the theory, a three-port equal Gysel FPD operating at 2 GHz was designed and fabricated. The simulated and measured results demonstrate that this FPD has good power splitting and filtering capability with the size of 0.15 λg × 0.25 λg (λg is the medium wavelength of the central frequency), which is a significant reduction compared to the existing Gysel FPDs. The simulated and measured results are presented to verify the theoretical derivation, demonstrating good features, such as a return loss greater than 15 dB, isolation greater than 15 dB, and an insertion loss of about 4.02 dB (3 + 1.02 dB) in the passband.

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Ari, Arzu, James B. Fink, and Sue Pilbeam. "Secondhand aerosol exposure during mechanical ventilation with and without expiratory filters: An in-vitro study." Indian Journal of Respiratory Care 05, no. 01 (2022): 677–82. http://dx.doi.org/10.5005/jp-journals-11010-05103.

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Background: Concerns have been expressed about risk of exposure to exhaled aerosols to ICU personnel. AIM: To quantify amount of aerosol collected at the exhaust outlet of mechanical ventilators operated with and without filters in the expiratory limb. Methods: Two categories of ventilators were tested: (1) Ventilators without Proprietary Filters: Servo-i (Maquet) and Galileo (Hamilton) and (2) Ventilator with proprietary filters: PB 840 (Covidien). Each ventilator was attached to a simple test lung and operated with VT 500 ml, RR 20 bpm, PIF 50 L/min, PEEP 5 cmH2O. Four separate doses of albuterol (2.5 mg/3mL) were administered via jet nebuliser (eValueMed, Tri-anim) placed at the “Y”. In Experiment A, a filter (Respirgard 303) was placed at the exhaust port. In Experiment B, two filters were attached to the ventilators without proprietary filters: (1) at the end of expiratory limb and (2) at the exhaust outlet. Drug was eluted from filters and measured using spectrophotometry. Results: Drug deposited at the exhaust port without expiratory filtering was >160 fold higher than with expiratory filtering. The collecting filter used in this study was less efficient than the proprietary filter designed for use with the ventilator. Regardless of type of filter used, placement of filter in the expiratory limb reduced secondhand aerosol exposure significantly. Conclusion: Risk of secondhand exposure to exhaled aerosol can account for >45% of nominal dose as well as droplet nuclei produced by patients. Using expiratory filters decreases risk of exposure to aerosol released to the atmosphere during mechanical ventilation.

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Tabi Fouda, Bernard Marie, Wenjun Zhang, Jacques Atangana, and Helene Carole Edima-Durand. "Development of a Key Method for the Optimization of Port Vessel Detection Based on an Improved Multi-Structural Morphology Approach." Journal of Marine Science and Engineering 12, no. 11 (2024): 1969. http://dx.doi.org/10.3390/jmse12111969.

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Abstract:

All over the world, many ports have implemented surveillance camera systems to monitor the vessels and activities around them. These types of systems are not very effective in accurately detecting activities around the port due to background noise and congestion interference at the sea surface. This is why it is difficult to accurately detect vessels, especially smaller vessels, when it turns dark. It is known that some vessels do not comply with maritime rules, particularly in port and safety zones; these must be detected to avoid incidents. For these reasons, in this study, we propose and develop an improved multi-structural morphology (IMSM) approach to eliminate all of this noise and interference so that vessels can be accurately detected in real time. With this new approach, the target vessel is separated from the sea surface background through the weighted morphological filtering of several datasets of structural components. Then, neighborhood-based adaptive fast median filtering is used to filter out impulse noise. Finally, a characteristic morphological model of the target vessel is established using the connected domain; this allows the sea surface congestion to be eliminated and the movement of vessels to be detected in real time. Multiple tests are carried out on a small and discrete area of moving vessels. The results from several collected datasets show that the proposed approach can effectively eliminate background noise and congestion interference in video monitoring. The detection accuracy rate and the processing time are improved by approximately 3.91% and 1.14 s, respectively.

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Journal articles on the topic 'Port filtering'

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