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Journal articles on the topic 'Point à point (PtP)'

Author: Grafiati

Published: 17 May 2025

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1

Wahyudi, Kaiji Sato, and Akira Shimokohbe. "Characteristics of practical control for point-to-point (PTP) positioning systems." Precision Engineering 27, no. 2 (April 2003): 157–69. http://dx.doi.org/10.1016/s0141-6359(02)00226-x.

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2

Fang, Ji Wen, Zhi Li Long, Lu Fan Zhang, Jian Dong Cai, and Long Sheng Nian. "Control Analysis of Point-to-Point Positioning Based on Macro-Micro Stage." Applied Mechanics and Materials 278-280 (January 2013): 1563–69. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.1563.

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Macro-micro stage can achieve large travel range and high precision positioning. The macro stage is driven by voice coil motor (VCM). The micro stage is actuated by the piezoelectric (PZT). The positioning theory of macro-micro stage is described. In this paper, the compensating method of point-to-point (PTP) positioning is divided into two types: compensation before steady state (CBS) and compensation after steady state (CAS). The different control strategies are applied to meet CAS and CBS. Because of the structure of macro-micro stage and the saturation of micro stage, switching control plays an important role in realizing high precision PTP motion. When the error of the macro stage is less than the threshold and also the system meets the switching conditions, the compensation signal is sent to the PZT control loop for high resolution compensation. Finally, the numerical simulation results show that the positioning accuracy of dual stage is higher than single macro stage and can reach nanometer scale.

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3

Abe, Akira. "Energy-Saving Breakthrough in the Point-to-Point Control of a Flexible Manipulator." Applied Sciences 14, no. 5 (February 22, 2024): 1788. http://dx.doi.org/10.3390/app14051788.

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This study aims to contribute academically valuable insights into energy-efficient drives for the positioning control of flexible structures. It focuses on the point-to-point (PTP) motion control of a flexible manipulator to suppress residual vibration and reduce driving energy simultaneously. The driving energy for PTP motion is influenced by the initial deflection of the flexible manipulator. Considering this phenomenon, the study proposes a trajectory planning method for the joint angle of a flexible manipulator. In this method, the evaluation function is defined as the sum of drive torques, and its minimization through particle swarm optimization generates an optimal trajectory that minimizes drive energy and suppresses residual vibration. Numerical simulations indicate that significant energy savings can be achieved by actively deforming the manipulator. These simulation results are corroborated by experimental data, which demonstrate the practical applicability and effectiveness of the proposed method.

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4

Wang, Xiaobang, Yang Yu, Siyu Li, Jie Zhang, and Zhijie Liu. "Point-to-Point-Based Optimization Method of Ballast Water Allocation for Revolving Floating Cranes with Experimental Verification." Journal of Marine Science and Engineering 12, no. 3 (March 1, 2024): 437. http://dx.doi.org/10.3390/jmse12030437.

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The Revolving Floating Crane (RFC) is a specialized engineering vessel crucial for offshore lifting operations, such as offshore platform construction and deep-water salvaging. It boasts impressive lifting capacity, good adaptability to various environmental conditions, and high operational efficiency. Conventionally, the safety and stability of RFC operations heavily depend on manual ballast water allocation, which is directly influenced by factors such as personnel status and sea conditions. These manual operations often result in reduced lifting efficiency, higher energy consumption, and compromised operational safety. In response, this paper introduces a ballast water-allocation approach based on the Point-to-Point (PTP) theory for the intelligent operation process of the RFC. The fundamental principles of the PTP theory are analyzed, and a method tailored to optimize ballast water allocation for RFC is proposed. Considering the unique characteristics of the ballast system and the specific requirements of lifting operations, an optimization model for PTP-based ballast water allocation is established. Numerical experiments are conducted to verify the efficacy and reliability of the proposed method. Comparing it to the conventional approaches, the results demonstrate a notable 17.75% reduction in energy consumption and an impressive 73.49% decrease in decision-making time, showcasing the superiority of the proposed approach. Finally, the engineering feasibility of the PTP-based optimization method for ballast water allocation is validated through actual lifting experiments, underscoring its potential to enhance RFC operations.

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5

Carabin, Giovanni, and Renato Vidoni. "Energy-saving optimization method for point-to-point trajectories planned via standard primitives in 1-DoF mechatronic systems." International Journal of Advanced Manufacturing Technology 116, no. 1-2 (June 17, 2021): 331–44. http://dx.doi.org/10.1007/s00170-021-07277-y.

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AbstractIn this work, an analytical methodology to minimize the energy expenditure of mechatronic systems performing point-to-point (PTP) trajectories based on well-known motion primitives is developed and validated. Both PTP trajectory profiles commonly used in industrial motor drives and more complex ones are investigated. Focusing on generic 1-DoF mechatronic systems moving a constant inertia load (e.g., elevators, cranes, CNC machines, Cartesian axis) and possibly equipped or retrofitted with regenerative devices, the consumed energy formulation is firstly derived. Then, the analytical optimization considering all the selected PTP trajectory profiles is computed and a generic closed-form solution is determined. Finally, numerical and experimental evaluations are done showing the effectiveness of the theoretical results and proposed methodology. In addition, all the different trajectories are compared with respect to energy consumption.

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6

Abe, Y., C. Hattori, M. Ito, M. Matsunaga, and T. Matsuoka. "Self-Dual Point and Unification." Progress of Theoretical Physics 102, no. 4 (October 1, 1999): 833–42. http://dx.doi.org/10.1143/ptp.102.833.

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7

., Wahyudi, Riza Muhida, and Momoh J. E. Salami. "Fuzzy Anti-windup Schemes for NCTF Control of Point-to-point (PTP) Positioning Systems." American Journal of Applied Sciences 4, no. 4 (April 1, 2007): 220–28. http://dx.doi.org/10.3844/ajassp.2007.220.228.

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8

Wahyudi, K. Sato, and A. Shimokohbe. "Robustness evaluation of three friction compensation methods for point-to-point (PTP) positioning systems." Robotics and Autonomous Systems 52, no. 2-3 (August 2005): 247–56. http://dx.doi.org/10.1016/j.robot.2005.03.004.

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9

Smith, L. J., G. Tabor, and J. Williams. "A retrospective case control study to investigate race level risk factors associated with horse falls in Irish point-to-point races." Comparative Exercise Physiology 14, no. 2 (June 6, 2018): 127–34. http://dx.doi.org/10.3920/cep170034.

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Horseracing as a high-risk sport can pose a significant risk to equine welfare. To date no epidemiological reviews of fall risk in horseracing have investigated the risks specific to point-to-point (PTP) racing. This study aimed to identify the main race level risk factors associated with horse falls in Irish PTP and to compare these to published findings for hurdle and steeplechase racing. The study used a retrospective case-control design. Relevant variables were identified and information was collated for all PTP races in the 2013/14 and 2014/15 seasons. Race-level variables were analysed through univariable analysis to inform multivariable model building. A final multivariable logistic regression model was refined, using fall/no fall as the dependent variable, through a backward stepwise process with variables retained if likelihood ratio test P-values were <0.05. During the study period 1,358 PTP races were recorded, 727 races (54%) included at least one horse fall. The fall frequency noted during the current study was 88/1000 starts. Race category impacted the odds of a fall occurring with all categories of maiden races having increased odds of falls compared to open races. Maiden races for 6 year olds and 6 and 7 year olds had the greatest chance of falling with 6.9 times increased odds. The chance of a race containing a fall increased 38% for each additional runner and was reduced by 25% for every horse that pulled up during the race. Using a larger data set could enable further sub-models to be developed. In the current study some of the variables had a low number of cases and/or controls which limited the analysis. Retrospective analysis of fall risk exposed some risk factors that have been previously identified in hurdle and steeplechase racing. The variables identified could inform future research and interventions aimed at improving horse and jockey safety whilst racing.

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10

Oono, Y. "Onsager's Principle from Large Deviation Point of View." Progress of Theoretical Physics 89, no. 5 (May 1, 1993): 973–83. http://dx.doi.org/10.1143/ptp/89.5.973.

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11

Souma, Wataru. "Non-Trivial Ultraviolet Fixed Point in Quantum Gravity." Progress of Theoretical Physics 102, no. 1 (July 1999): 181–95. http://dx.doi.org/10.1143/ptp.102.181.

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12

Mohamed, Ibrahim M. M., and Saif AL-Islam Ateeya AL-Salheen. "A survivable Point-to-Point (PTP) Wireless Transmission Based On Adaptive Coding and Modulation (ACM) Technique." Al-Mukhtar Journal of Engineering Research 7, no. 1 (May 10, 2024): 12–19. http://dx.doi.org/10.54172/jszswq55.

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Wireless transmission can be affected by severe weather conditions such as heavy rain. Such a temporary weather condition leads to decrease the received power and thus reduce the signal-to-noise ratio, which degrades the overall performance. In some cases, in which a high bit rate is being transmitted where a specific amount of signal-to-noise ratio is required, the wireless transmission drops down completely. Adaptive Coding and Modulation technique could provide the feature of adaptation during transmission. In Adaptive Coding and Modulation, transmission parameters such as modulation scheme and/ or code rate can be altered based on signal-to-noise ratio measurements. In this paper, a survivable point-to-point wireless transmission was established using Adaptive Coding and Modulation technology. A concentration on the Adaptive Modulation was made in this work by using the AF-11FX equipment which is capable of modulate carriers using different modulation schemes (QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM). In this context, the wireless point-to-point link was examined with and without the use of Adaptive Modulation. A survivable transmission was achieved in which an automatic switching mechanism is performed among the aforementioned modulation schemes based on signal-to-noise ratio measurements, which led to increase the average transmission rate.

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13

Wu, Bin, Hongxi Yin, Jie Qin, Chang Liu, Anliang Liu, Qi Shao, and Xiaoguang Xu. "Design and implementation of flexible TWDM-PON with PtP WDM overlay based on WSS for next-generation optical access networks." Modern Physics Letters B 30, no. 25 (September 20, 2016): 1650324. http://dx.doi.org/10.1142/s0217984916503243.

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Aiming at the increasing demand of the diversification services and flexible bandwidth allocation of the future access networks, a flexible passive optical network (PON) scheme combining time and wavelength division multiplexing (TWDM) with point-to-point wavelength division multiplexing (PtP WDM) overlay is proposed for the next-generation optical access networks in this paper. A novel software-defined optical distribution network (ODN) structure is designed based on wavelength selective switches (WSS), which can implement wavelength and bandwidth dynamical allocations and suits for the bursty traffic. The experimental results reveal that the TWDM-PON can provide 40 Gb/s downstream and 10 Gb/s upstream data transmission, while the PtP WDM-PON can support 10 GHz point-to-point dedicated bandwidth as the overlay complement system. The wavelengths of the TWDM-PON and PtP WDM-PON are allocated dynamically based on WSS, which verifies the feasibility of the proposed structure.

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14

Igarashi, H., Y. Takimoto, and T. Fujiwara. "On the Three-Point Couplings in Toda Field Theory." Progress of Theoretical Physics 99, no. 1 (January 1, 1998): 45–53. http://dx.doi.org/10.1143/ptp.99.45.

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15

Goda, M., K. Itagaki, and H. Yamada. "Particle Diffusion in Correlated Disordered Media near Transition Point." Progress of Theoretical Physics Supplement 126 (May 16, 2013): 363–66. http://dx.doi.org/10.1143/ptp.126.363.

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16

Minami, Y., and T. Kunihiro. "Dynamical Density Fluctuations around QCD Critical Point Based on Dissipative Relativistic Fluid Dynamics: Possible Fate of Mach Cone at the Critical Point." Progress of Theoretical Physics 122, no. 4 (October 1, 2009): 881–910. http://dx.doi.org/10.1143/ptp.122.881.

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17

Ishii, M. "Symmetry and the Singular Point Analysis for Ordinary Differential Equations." Progress of Theoretical Physics 87, no. 5 (May 1, 1992): 1075–86. http://dx.doi.org/10.1143/ptp/87.5.1075.

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18

Bejancu, A. "A New Point of View on General Kaluza-Klein Theories." Progress of Theoretical Physics 128, no. 3 (September 1, 2012): 541–85. http://dx.doi.org/10.1143/ptp.128.541.

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19

Burkhalter, R., M. Imachi, Y. Shinno, and H. Yoneyama. "CPN-1 Models with a Term and Fixed Point Action." Progress of Theoretical Physics 106, no. 3 (September 1, 2001): 613–40. http://dx.doi.org/10.1143/ptp.106.613.

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20

Okada, Kenkichi. "Generalized Phase Rule and Possible Singular Point Sets in Physical Systems." Progress of Theoretical Physics 78, no. 6 (December 1, 1987): 1236–41. http://dx.doi.org/10.1143/ptp.78.1236.

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21

Fujiwara, Y., A. Hosoya, and T. Mishima. "(2 + 1)-Dimensional Classical Gravity with Point Sources in Maximal Slice." Progress of Theoretical Physics 85, no. 6 (June 1, 1991): 1363–70. http://dx.doi.org/10.1143/ptp.85.1363.

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22

Suzuki, J. "2S + 1 State Vertex Model at a First Order Transition Point." Progress of Theoretical Physics 89, no. 2 (February 1, 1993): 345–54. http://dx.doi.org/10.1143/ptp/89.2.345.

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23

Kobayashi, T., H. Nakano, H. Terao, and Y. Yamada. "Large Mass Scale by Strong Gauge Dynamics with Infrared Fixed Point." Progress of Theoretical Physics 113, no. 2 (February 1, 2005): 413–27. http://dx.doi.org/10.1143/ptp.113.413.

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24

Takushi, E. "On the Existence of Gel-Glasslike Transition Point in Biopolymer Gels." Progress of Theoretical Physics Supplement 126 (May 16, 2013): 379–82. http://dx.doi.org/10.1143/ptp.126.379.

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25

Wang, Juan, Changcheng Chen, Mengsi Peng, Yizu Wang, Bao Wu, Yili Zheng, and Xueqiang Wang. "Intra- and Inter-Rater Reliability of Three Measurements for Assessing Tactile Acuity in Individuals with Chronic Low Back Pain." Evidence-Based Complementary and Alternative Medicine 2020 (November 24, 2020): 1–14. http://dx.doi.org/10.1155/2020/8367095.

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Objective. To investigate the intra- and inter-rater reliability of three measurements on painful and pain-free sides in participants with chronic low back pain (CLBP) at different ages. Methods. We recruited 60 participants with CLBP and divided them equally into a group of younger participants with chronic low back pain (18 ≤ age ≤ 35, Y-CLBP) and a group of older participants with chronic low back pain (36 ≤ age ≤ 65, O-CLBP). Participants were assessed by two testers within the same day (10 min interval), and one of the testers repeated the assessment program 24 h later. The intraclass correlation coefficient (ICC) was used to assess reliability. The Pearson correlation coefficient was used to analyze the correlation between tactile acuity and age, waistline, and pain-related variables. Results. In the Y-CLBP group, the intra-rater reliability of two-point discrimination (TPD), point-to-point test (PTP), and two-point estimation (TPE) on the painful and pain-free sides was good (ICC range: 0.74–0.85), whereas the inter-rater reliability of TPD, PTP, and TPE on the painful and pain-free sides was moderate to good (ICC range: 0.65–0.76). In the O-CLBP group, the intra-rater reliability of TPD, PTP, and TPE on the painful and pain-free sides was good (ICC range: 0.75–0.85), whereas the inter-rater reliability of TPD, PTP, and TPE on the painful and pain-free sides was moderate to good (ICC range: 0.70–0.85). Age, waistline, duration of pain, maximum pain, general pain, and unpleasant score caused by pain were positively correlated with tactile acuity thresholds (D-TPD, A-TPD, PTP, and TPE) (r > 0.365, p < 0.05 ). When BMI was controlled, age, waistline, and pain-related variables were positively correlated with tactile acuity thresholds (r > 0.388; p < 0.05 ). Conclusion. In the participants of Y-CLBP and O-CLBP groups, TPD, PTP, and TPE have moderate-to-good intra- and inter-rater reliability on the painful and pain-free sides of the fifth lumbar vertebrae.

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26

Pandey, Kaushlendra, Abhishek Gupta, Harpreet Dhillon, and Kanaka Perumalla. "Properties of a Random Bipartite Geometric Associator Graph Inspired by Vehicular Networks." Entropy 25, no. 12 (December 4, 2023): 1619. http://dx.doi.org/10.3390/e25121619.

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We consider a point process (PP) generated by superimposing an independent Poisson point process (PPP) on each line of a 2D Poisson line process (PLP). Termed PLP-PPP, this PP is suitable for modeling networks formed on an irregular collection of lines, such as vehicles on a network of roads and sensors deployed along trails in a forest. Inspired by vehicular networks in which vehicles connect with their nearest wireless base stations (BSs), we consider a random bipartite associator graph in which each point of the PLP-PPP is associated with the nearest point of an independent PPP through an edge. This graph is equivalent to the partitioning of PLP-PPP by a Poisson Voronoi tessellation (PVT) formed by an independent PPP. We first characterize the exact distribution of the number of points of PLP-PPP falling inside the ball centered at an arbitrary location in R2 as well as the typical point of PLP-PPP. Using these distributions, we derive cumulative distribution functions (CDFs) and probability density functions (PDFs) of kth contact distance (CD) and the nearest neighbor distance (NND) of PLP-PPP. As intermediate results, we present the empirical distribution of the perimeter and approximate distribution of the length of the typical chord of the zero-cell of this PVT. Using these results, we present two close approximations of the distribution of node degree of the random bipartite associator graph. In a vehicular network setting, this result characterizes the number of vehicles connected to each BS, which models its load. Since each BS has to distribute its limited resources across all the vehicles connected to it, a good statistical understanding of load is important for an efficient system design. Several applications of these new results to different wireless network settings are also discussed.

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27

Bădulescu, Dana. "Huxley’s “Jungle of Noise” in Point Counter Point." Revista Canaria de Estudios Ingleses, no. 84 (2022): 19–29. http://dx.doi.org/10.25145/j.recaesin.2022.84.02.

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Point Counter Point, Aldous Huxley’s experiment with the ”musicalisation of fiction” (PCP 384, –References to Point Counter Point will be abbreviated hereon in PCP–) was published in 1928, the end of a decade of post-war trauma, conflicting ideologies, proliferating scientific theories, new technologies and reckless hedonism. These amalgamated aspects found their expression in the novel’s cubist montage, contrapuntal orchestration and cynical tone. I argue that, in tandem with the experimental poetry and prose of Huxley’s contemporaries, Point Counter Point set the tone for a new literary culture on both sides of the Atlantic. This approach accounts for the novel’s experimental techniques and design, starting from the ”jungle of noise” (65) metaphor.

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28

S, Sreeja, and Sharu Susan Jacob. "A comparative study of pose estimation algorithms for visual navigation in autonomous robots." International Robotics & Automation Journal 9, no. 3 (December 29, 2023): 124–30. http://dx.doi.org/10.15406/iratj.2023.09.00274.

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Autonomous navigation is a research field that gives mobile robots the capacity to perform various tasks without human assistance. Autonomous navigation based on visual sensors can be used in GPS denied environments. Vision-based navigation performs feature detection, matching, and pose estimation using camera images. This paper presents a new approach to autonomous navigation for mobile robots using a Color-based Image Segmentation and Centroid Detection algorithm instead of traditional feature detection algorithms. The algorithm intentionally matches features across images using known feature points and uses conventional techniques such as Epipolar Geometry and Perspective-N-Points algorithms for camera pose estimation. The study includes camera calibration to estimate intrinsic parameters and their physical unit conversion ensuring accurate measurements. Experimental datasets are used to analyze the performance of the Epipolar geometry, Perspective-3-Point, and Efficient-Perspective-n-Point based pose estimation algorithms. To enhance accuracy, the P3P algorithm is modified to consider combinations of image points for pose estimation. The paper concludes with a comparative analysis between the original P3P algorithm and the modified version, providing valuable insights into their respective performances. Overall, the paper aims to provide a comparison of different pose estimation algorithms used for visual navigation. Keywords: pose estimation, visual navigation, camera calibration, perspective-n-point, efficient pnp, epipolar geometry Abbreviations PnP, perspective-n-point; P3P, perspective-3-point; EPnP, efficient perspective-n-point; SLAM, simultaneous localization and mapping; VO, visual odometry; GPS, global positioning system; SURF, speeded up robust features; SIFT, scale-invariant feature transform; EKF, extended kalman filter; RGB, red-green-blue; HSV, hue- saturation-value; CNN, convolutional neural network

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29

Hirayama, M., T. Hamada, and M. Hasegawa. "Non-Abelian Gauge Configuration with a Magnetic Field Concentrated at a Point." Progress of Theoretical Physics 98, no. 6 (December 1, 1997): 1391–95. http://dx.doi.org/10.1143/ptp.98.1391.

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30

Tsuji, A. "Holography of Two-Point Functions in the Spinning String/Spin Chain Correspondence." Progress of Theoretical Physics 117, no. 3 (March 1, 2007): 557–68. http://dx.doi.org/10.1143/ptp.117.557.

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31

Kubota, K. I., and H. Terao. "Dynamical Symmetry Breaking in QED3 from the Wilson RG Point of View." Progress of Theoretical Physics 105, no. 5 (May 1, 2001): 809–25. http://dx.doi.org/10.1143/ptp.105.809.

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32

Jung, Jiwon, Yunyoung Choi, and Younggoo Kwon. "Location-Aware Point-to-Point RPL in Indoor IR-UWB Networks." Electronics 9, no. 5 (May 22, 2020): 861. http://dx.doi.org/10.3390/electronics9050861.

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Wireless multi-hop ad hoc routing is one of the critical design factors that determine the network performance of various wireless IoT applications. IETF has standardized the point-to-point RPL (P2P-RPL) routing protocol to overcome the inefficient routing overheads of RPL. However, P2P-RPL propagates the route discovery forwarding packets throughout the whole network. P2P-RPL suffers from the high energy consumption and the huge route discovery overhead in low-power and lossy networks (LLNs). In this paper, we propose a novel Location-Aware P2P-RPL (LA P2P-RPL), which achieves the energy-efficient P2P data delivery without reducing the networking reliability. The proposed algorithm introduces the Impulse-Response UWB (IR-UWB) based cooperative multi-hop self localization algorithm and the Location-Aware P2P-RPL algorithm for Indoor IR-UWB based networks. To increase the localization accuracy, smartphone based Inertial Navigation System (INS) with particle filtering is used in indoor multi-hop environments. The performance evaluations for Location-Aware P2P-RPL algorithm are compared with the traditional P2P-RPL and the ER-RPL algorithm to show the significant performance improvements for route discovery overheads and energy consumptions in LLNs.

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33

Yamashita, M. "Ripped Phase and Critical Point of a System Showing Commensurate-Incommensurate Phase Transition." Progress of Theoretical Physics 78, no. 4 (October 1, 1987): 780–86. http://dx.doi.org/10.1143/ptp.78.780.

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34

Fukutaka, H., and T. Kashiwa. "Privileged Role of the Mid-Point Prescription in Path Integrations for Constrained Systems." Progress of Theoretical Physics 80, no. 1 (July 1, 1988): 151–61. http://dx.doi.org/10.1143/ptp.80.151.

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35

Park, Y., and Y. Yoon. "Exactly Solvable 1/r2 Extended Pauli-Hamiltonian for a Point Magnetic Vortex System." Progress of Theoretical Physics 95, no. 2 (February 1, 1996): 261–71. http://dx.doi.org/10.1143/ptp.95.261.

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36

Profilo, G., and G. Soliani. "Noether Invariants and Complete Lie-Point Symmetries for Equations of the Hill Type." Progress of Theoretical Physics 84, no. 5 (November 1, 1990): 974–92. http://dx.doi.org/10.1143/ptp/84.5.974.

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37

Sano, K. "Current-Voltage Characteristics for a Point Contact Composed of Two Different Peierls Conductors." Progress of Theoretical Physics 109, no. 1 (January 1, 2003): 11–17. http://dx.doi.org/10.1143/ptp.109.11.

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38

Lara Cueva, Román Alcides, and Daniel Mauricio Merino Jácome. "Modelización del canal inalámbrico para enlaces punto a punto empleando tecnología Zigbee en entornos exteriores - On Modeling Wireless Channel for point to point links by using Zigbee technology in Outdoors Scenarios." ReCIBE, Revista electrónica de Computación, Informática, Biomédica y Electrónica 6, no. 1 (December 6, 2017): 151–66. http://dx.doi.org/10.32870/recibe.v6i1.76.

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En el presente trabajo se realiza el modelización del canal de propagación para una red de comunicación punto a punto (PtP, del inglés Point-To-Point) entre dispositivos que utilizan tecnología ZigBee en entornos suburbanos a 2.4GHz, para poder brindar a la comunidad científica encargada de la planificación y dimensionamiento de redes, un modelo ajustado específicamente a redes con estas características que permitirá aumentar la eficiencia y disminuir los costos implícitos de las mismas. El modelo presentado fue obtenido al interpolar las mediciones de la potencia recibida (RSSI, del inglés Received Signal Strength Indicator) durante el despliegue de una red PtP de longitud variable de 2 a 160 metros, modificando la altura de los dispositivos en intervalos de 25 centímetros y ajustando las curvas resultantes a modelos matemáticos conocidos. En contraposición a diversos artículos de la literatura, nuestro modelo hace énfasis en el efecto causado por la altura de los dispositivos sobre la distancia a la cual se genera discontinuidad en el modelo de propagación, encontrándose que dicha discontinuidad describe un comportamiento exponencial decreciente donde a medida que la altura aumenta, la discontinuidad se aproxima al transmisor, hasta una distancia límite de 60 metros, a partir de la cual la altura de los dispositivos deja de influir en la distancia donde se produce la discontinuidad.Abstract: In the present work we are modeling a propagation channel for a point-to-point (PtP) communication network between devices, using ZigBee technology in 2.4 GHz and suburban environments, in order to provide tools for the scientific community that manage planning and sizing of networks, a model is adjusted specifically to networks with these characteristics that will allow to increase the efficiency and to reduce the implicit costs. The model presented is obtained by interpolating the Received Signal Strength Indicator (RSSI) during the deployment of a PtP network of variable length from 2 to 160 meters, modifying the height of the devices in intervals of 25 centimeters and adjusting the resulting curves to known mathematical models. In contrast to several articles in the literature, our model emphasizes the effect caused by the height of the devices over the distance to which discontinuity is generated in the propagation model, and it was found that this discontinuity describes a decreasing exponential behavior in the measure. And that the height increases, the discontinuity approaches the transmitter, up to a limit distance of 60 meters, from which the height of the devices ceases to influence the distance when the discontinuity occurs.Keywords: ZigBee, RSSI, modeling, wireless channel

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Supriyanto, Bambang, and Suharyanto Suharyanto. "Perancangan Jaringan VPN Menggunakan Metode Point To Point Tunneling Protocol." Jurnal Teknik Komputer 5, no. 2 (August 1, 2019): 235–40. http://dx.doi.org/10.31294/jtk.v5i2.5452.

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PT. Hail Otis Logistics is a Forwarding and Expedition Company that provides Custom Clearence Export and Import services as well as Shipping or Delivery from Partner Companies to Tanjung Priuk Port and vice versa. Currently PT. Hail Otis Logistics is sending company data using e-mail, so the company cannot yet ensure the security of the data sent. Due to the company's problems, designing a VPN is a means of communicating and transferring data securely and maintaining data validity. In this study VPN was built using the PPTP (Point To Point Tunneling Protocol) method to build a VPN network at PT. Hail Otis Logistics. Use PPTP because this method uses a protocol that allows point to point relationships that pass through the IP network. Results obtained in VPN development at PT. Hail Otis Logistics are VPN networks that can connect between headquarters and branch offices to transfer data safely. VPN development can provide security with encryption in every data communication.Keywords: PPTP, Network, VPN

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Tan, Shufeng, Qifei Wang, Ziwei Wan, and Fei Luo. "CRT-Based Clock Synchronization for Millimeter-Wave Communication with Asymmetric Propagation Delays." Electronics 13, no. 13 (June 21, 2024): 2441. http://dx.doi.org/10.3390/electronics13132441.

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The rapid advancement of millimeter-wave communication technology has presented new challenges for time synchronization, driven by the need for high-speed and low-latency data transmission. Ethernet synchronization technologies, such as Precise Time Protocol (PTP), have emerged to overcome the limitations of point-to-point architecture and enable precise synchronization across multiple devices. A key drawback of conventional PTP is its reliance on symmetric packet exchange delays, which may not hold in real-world scenarios where there is relative mobility between master and slave nodes, leading to asymmetric propagation delays and clock offset errors. To address this issue, a novel clock synchronization protocol that integrates Chinese Remainder Theory (CRT) has been proposed. This protocol enhances conventional PTP by incorporating distance estimation based on CRT using multi-carrier phase measurement. By combining a coarse estimation of one-way propagation delay from conventional PTP with a fine estimation of remainder distance from CRT, the protocol accurately determines the distance between master and slave nodes, reducing motion errors and enhancing clock synchronization accuracy. Simulation results indicate that the Root Mean Square Error (RMSE) of distance estimation remains below 10−5 meters, with a corresponding motion time error of approximately 0.01 picosecond.

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Inagaki, T., K. Ishikawa, and T. Muta. "Exact Solution of the Equation for Spinor Two-Point Functions in the Einstein Universe." Progress of Theoretical Physics 96, no. 4 (October 1, 1996): 847–52. http://dx.doi.org/10.1143/ptp.96.847.

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Takemoto, H., and A. Tohsaki. "Electrostatic Energy of an Aggregate of Point Charges with Periodicity in a Uniform Background." Progress of Theoretical Physics 111, no. 2 (February 1, 2004): 213–28. http://dx.doi.org/10.1143/ptp.111.213.

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Kim, Youngman, Fred Myhrer, and Kuniharu Kubodera. "Fixed-Point Analysis of the Low-Energy Constants in the Pion-Nucleon Chiral Lagrangian." Progress of Theoretical Physics 112, no. 2 (August 2004): 289–97. http://dx.doi.org/10.1143/ptp.112.289.

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Miyazima, S. "An Exact Percolation Point of Surface Filling in a Four-Dimensional Hyper-Cubic Lattice." Progress of Theoretical Physics 113, no. 6 (June 1, 2005): 1159–63. http://dx.doi.org/10.1143/ptp.113.1159.

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Yoshinaga, N., T. Mizusaki, A. Arima, and Y. D. Devi. "Microscopic Foundations of the Interacting Boson Model from the Shell-Model Point of View." Progress of Theoretical Physics Supplement 125 (May 16, 2013): 65–95. http://dx.doi.org/10.1143/ptp.125.65.

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Ito, N., and M. Suzuki. "Fractal Configurations of the Two- and Three-Dimensional Ising Models at the Critical Point." Progress of Theoretical Physics 77, no. 6 (June 1, 1987): 1391–401. http://dx.doi.org/10.1143/ptp.77.1391.

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Hirayama, T., and T. Hara. "A Calculation on the Self-Field of a Point Charge and the Unruh Effect." Progress of Theoretical Physics 103, no. 5 (May 1, 2000): 907–28. http://dx.doi.org/10.1143/ptp.103.907.

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Wang, Min, Shu Guang Zhang, Qiao Yun Sun, and Yu Zhang. "Resources Allocation Scheme Based on Mode Switch for Multicast Services in MBSFN." Applied Mechanics and Materials 543-547 (March 2014): 3044–48. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.3044.

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The multimedia broadcast and multicast services (MBMS) in 3GPP LTE is characterized by multicast broadcast single frequency network (MBSFN) operation. The multicast services are transmitted by single frequency network (SFN) mode, and the unicast services are delivered with point-to-point (PTP) mode. To avoid the network congestion of the multicast services in MBSFN, a novel resources allocation scheme (RAS) based on mode switch for the multicast services is proposed. The RAS takes advantages of the mode switch between SFN and PTP for the multicast services and minimizes the demanded radio resources of the maximum load cell. The simulation results show that the proposed RAS needs less demanded radio resources of the maximum load cell than SFN mode for all the multicast services.

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Benedetti, I., O. Chiavola, F. Palmieri, and L. Tundo. "Analysis of Flow Rate Distribution in Progressive Divider for Reciprocating Compressor Lubrication." Journal of Physics: Conference Series 2648, no. 1 (December 1, 2023): 012052. http://dx.doi.org/10.1088/1742-6596/2648/1/012052.

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Abstract Reciprocating compressors require a correct fluid delivery to each lubrication point. Lubricant defeat means higher component wear and damages, whereas lubricant excess leads to undesired contamination of the processed gas, energy waste and ambient pollution. Two main lubrication systems are used for reciprocating compressors, namely “Pump To Point” (PTP) and “Progressive Divider” (PD) systems. In the first one, there are as many pumps as lubrication points and on each pump unit it is possible to adjust the flow rate delivery. In the second one, a single pump delivers the lubricant to a volumetric flow divider, which provides the metered amount to each lubrication point. A Progressive Divider is modelled under lumped parameter approach, with the aim to highlight its sensitivity to the main operating parameters and to provide awareness about its available operating range. The model is built in Amesim environment and validated thanks to a specific experimental activity that allows to relate the distributed amounts to the lubrication points. The model allows to simulate the PD system under the typical conditions of reciprocating compressors, pointing out its sensitivity on the pressure unbalance among the lubrication points and on the fluid properties. The lumped parameter modelling of PD systems is found to provide reliable information on fluid distribution, effective for design and diagnose activities and for research and development in the field of hydraulic progressive dividers.

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Satryawati, Eka, Dwi Agung Pangestu, and Ade Surya Budiman. "IMPLEMENTASI VIRTUAL PRIVATE NETWOR MENGGUNAKAN POINT-TO-POINT TUNNELING PROTOCOL." JEIS: JURNAL ELEKTRO DAN INFORMATIKA SWADHARMA 2, no. 1 (January 28, 2022): 36–42. http://dx.doi.org/10.56486/jeis.vol2no1.160.

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Today's technological development is very rapid, especially in the field of network security. The field of network security is a matter that will be a very important part because the network security system is used to guarantee the confidentiality, theft, or burglary of data on a company. In its implementation, a VPN network (Virtual Private Network) uses a site-to-site Point to Point Tunel Protocol (PPTP) method to connect between two places that are located far apart. The main facility of using PPTP is being able to use a public-switched telephone network (PSTN) to build a VPN. At PT Indosis Integrasi Jakarta, the place where the author conducts research there are several problems that the author found, namely, when sending data between the head office and branch offices in Bandung, there is no security that ensures that the data is safe. With the current state of the network, uninterested parties will easily access or steal confidential company data.

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