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Journal articles on the topic 'Failed handoff'
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Donnelly, Michael J., Janelle M. Clauser, and Rochelle E. Tractenberg. "A Multicenter Intervention to Improve Ambulatory Care Handoffs at the End of Residency." Journal of Graduate Medical Education 6, no. 1 (2014): 112–16. http://dx.doi.org/10.4300/jgme-d-13-00139.1.
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Abstract Background Graduating residents transition their continuity clinic patients to junior colleagues every year, creating a vulnerable transition period for about 1 million patients nationally. Objective We examined a standardized, electronic template for handing off high-risk ambulatory patients by outgoing residents from 7 residencies within a large health care system, and compared handoff quantity and provider satisfaction for handoffs with and without that template. Methods Residents graduating in 2011 from 5 internal medicine, 1 family medicine, and 1 internal medicine-pediatrics residency programs in 1 health care system were randomized to a new electronic handoff process with a standardized intervention template or a free-text handoff. Expert reviewers independently evaluated all handoff notes, and providers were surveyed after follow-up appointments regarding use, helpfulness, and overall satisfaction with the handoffs. Results Fifty-two of 79 residents (66%) participated, performing 278 handoffs. Eighty-four patients (30%, 17 of 57) failed to follow up within the study period. For patients who followed up, providers read 61% (101 of 165) of the handoffs at the time of the visit. No significant difference existed between groups in the satisfaction of the follow up provider or the quality measure of the handoffs in our process. Expert agreement on which features make the handoff “helpful” was fair (κ = 0.34). Conclusions A standardized template did not improve handoff quantity or satisfaction compared with a free-text handoff. Practical handoff programs can be instituted into diverse residencies within a short time frame, with most residents taking part in creating the handoff formats.
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Dhivya, J. Josephine, and M. Ramaswami. "Ingenious Method for Conducive Handoff Appliance in Cognitive Radio Networks." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 6 (2018): 5195. http://dx.doi.org/10.11591/ijece.v8i6.pp5195-5202.
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Wireless communications deployed in the current epoch claims ceaseless connection among its users thereby leading to the investigation of Cognitive Radio Networks (CRN) which enables to make use of unallocated spectrum optimally and provides uninterrupted connection. Establishing interminable connectivity during the handoff process in spectrum mobility of CRN is a challenging task. This paper elucidates the optimization of handoff process carried out in CRN by incorporating an intelligent method. This includes fuzzy logic wherein the handoff parameters are processed thereby indicating the need of handoff. The proffered method also comprises of a part of genetic algorithm which yields fitness value for reducing the handoff occurrences and enhancing the overall performance of the system is promoted using cuckoo search which decides the mobile node from which the handoff process has to initiate based on the priority generated. This technique ensures that decision is taken ahead of link failure rather than range failure which are the key point in comparison to the existing system. Results obtained through the simulation are satisfactory in terms of delay, throughput, number of failed handoff and handoffs performed in comparison to the existing fuzzy based handoff process in CRN.
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Cesar, Hernandez, Giral Diego, and Salgado C. "Failed handoffs in collaborative Wi-Fi networks." TELKOMNIKA Telecommunication, Computing, Electronics and Control 18, no. 2 (2020): 669–75. https://doi.org/10.12928/TELKOMNIKA.v18i2. 14894.
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Cognitive radio networks enable a more efficient use of the radioelectric spectrum through dynamic access. Decentralized cognitive radio networks have gained popularity due to their advantages over centralized networks. The purpose of this article is to propose the collaboration between secondary users for cognitive Wi-Fi networks, in the form of two multi-criteria decision-making algorithms known as TOPSIS and VIKOR and assess their performance in terms of the number of failed handoffs. The comparative analysis is established under four different scenarios, according to the service class and the traffic level, within the Wi-Fi frequency band. The results show the performance evaluation obtained through simulations and experimental measurements, where the VIKOR algorithm has a better performance in terms of failed handoffs under different scenarios and collaboration levels.
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Girma, Solomon T., and Abinet G. Abebe. "Mobility Load Balancing in Cellular System with Multicriteria Handoff Algorithm." Advances in Fuzzy Systems 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/2795905.
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Efficient traffic load balancing algorithm is very important to serve more mobile users in the cellular networks. This paper is based on mobility load balancing handoff algorithm using fuzzy logic. The rank of the serving and the neighboring Base Transceiver Stations (BTSs) are calculated every half second with the help of measurement report from the two-ray propagation model. This algorithm is able to balance load of the BTS by handing off some ongoing calls on BTS’s edge of highly loaded BTS to move to overlapping underloaded BTS, such that the coverage area of loaded BTS virtually shrunk towards BTS center of a loaded sector. In case of low load scenarios, the coverage area of a BTS is presumed to be virtually widened to cover up to the partial serving area of neighboring BTS. This helps a highly loaded neighboring BTS or failed BTS due to power or transmission. Simulation shows that new call blocking and handoff blocking using the proposed algorithm are enhanced notably.
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Kettrey, Heather Hensman, Alyssa J. Davis, and Jessica Liberman. "“Consent Is F#@king Required”: Hashtag Feminism Surrounding Sexual Consent in a Culture of Postfeminist Contradictions." Social Media + Society 7, no. 4 (2021): 205630512110629. http://dx.doi.org/10.1177/20563051211062915.
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Hashtag feminism exists in a time of postfeminist contradictions marked by the simultaneous existence of popular feminism and popular misogyny. In one such contradiction, popular feminism has led women to expect the successful negotiation of sexual consent, while popular misogyny permits the circulation of traditional sexual scripts that disregard the necessity of consent. In this study, we analyze messages conveyed through digitized narratives of sexual consent posted on Tumblr, a social media site that is popular among feminist activists, to identify the ways that users construct meaning around the dissonance between expectations for consent and the inequalities that inhibit its negotiation. We specifically explore whether hashtag feminism navigates postfeminist contradictions in a way that simultaneously calls out misogyny and calls on feminism. We find that the Tumblr posts in our sample did both, albeit in a manner that failed to offer tangible solutions to the problem at hand. Calls on feminism were largely limited to tagging feminist allies and recirculating existing feminist campaigns. Thus, we argue that the hashtag ultimately became a handoff to a larger feminist abstraction. Future research should explore conditions under which activists link tangible issues, actors, and agendas to an otherwise abstract popular feminism.
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Hernandez, Cesar, Diego Giral, and C. Salgado. "Failed handoffs in collaborative Wi-Fi networks." TELKOMNIKA (Telecommunication Computing Electronics and Control) 18, no. 2 (2020): 669. http://dx.doi.org/10.12928/telkomnika.v18i2.14894.
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Giral, Diego, Cesar Hernández, and Enrique Rodríguez-Colina. "Spectrum Decision-Making in Collaborative Cognitive Radio Networks." Applied Sciences 10, no. 19 (2020): 6786. http://dx.doi.org/10.3390/app10196786.
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Spectral decision making is a function of the cognitive cycle. It aims to select spectral opportunities within a set of finite possibilities. Decision-making methodologies, based on collaborative information exchanges, are used to improve the selection process. For collaborative decision making to be efficient, decisions need to be analyzed based on the amount of information. Using little data can produce inefficient decisions, and taking a lot of data can result in high computational costs and delays. This document presents three contributions: the incorporation of a collaborative strategy for decision making, the implementation of real data, and the analysis of the amount of information through the number of failed handoffs. The collaborative model acts as a two-way information node, the information it coordinates corresponds to the Global System for Mobile Communications (GSM) band, and the amount of information to be shared is selected according to five levels of collaboration: 10%, 20%, 50%, 80%, and 100%, in which each percentage represents the total number of users that will be part of the process. The decision-making process is carried out by using two multi-criteria techniques: Feedback Fuzzy Analytical Hierarchical Process (FFAHP) and Simple Additive Weighting (SAW). The results are presented in two comparative analyses. The first performs the analysis using the number of failed handoffs. The second quantifies the level of collaboration for the number of failed handoffs. Based on the obtained percentage ratios, the information shared, and the average of increase rates, the level of collaboration that leads to efficient results is determined to be between 20% and 50% for the given number of failed handoffs.
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Diego, Giral, Hernandez Cesar, and Martinez Fredy. "Analysis and assessment software for multi-user collaborative cognitive radio networks." International Journal of Electrical and Computer Engineering (IJECE) 12, no. 4 (2022): 4507–20. https://doi.org/10.11591/ijece.v12i4.pp4507-4520.
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Computer simulations are without a doubt a useful methodology that allows to explore research queries and develop prototypes at lower costs and timeframes than those required in hardware processes. The simulation tools used in cognitive radio networks (CRN) are undergoing an active process. Currently, there is no stable simulator that enables to characterize every element of the cognitive cycle and the available tools are a framework for discrete-event software. This work presents the spectral mobility simulator in CRN called “App MultiColl-DCRN”, developed with MATLAB’s app designer. In contrast with other frameworks, the simulator uses real spectral occupancy data and simultaneously analyzes features regarding spectral mobility, decision-making, multi-user access, collaborative scenarios and decentralized architectures. Performance metrics include bandwidth, throughput level, number of failed handoffs, number of total handoffs, number of handoffs with interference, number of anticipated handoffs and number of perfect handoffs. The assessment of the simulator involves three scenarios: the first and second scenarios present a collaborative structure using the multi-criteria optimization and compromise solution (VIKOR) decision-making model and the naïve Bayes prediction technique respectively. The third scenario presents a multi-user structure and uses simple additive weighting (SAW) as a decision-making technique. The present development represents a contribution in the cognitive radio network field since there is currently no software with the same features.
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Hernandez, Cesar, Diego Giral, and Tania Vaca. "Performance evaluation of a proposal for spectrum assignment based on combinative distance-based assessment multicriteria strategy." International Journal of Electrical and Computer Engineering (IJECE) 14, no. 5 (2024): 5308. http://dx.doi.org/10.11591/ijece.v14i5.pp5308-5318.
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Cognitive radio networks offer an alternative to low spectral availability in some frequency bands due to their high demand for frequency channels. This article proposes to improve the spectral assignment based on the combinative distance-based assessment multicriteria algorithm. The metrics obtained are compared with a simple additive weighting algorithm and a RANDOM selection. To establish the algorithm 's performance, five quality-of-service metrics are used: number of handoffs, number of failed handoffs, average bandwidth, average throughput, and cumulative average delay. From the analysis of the results obtained, combinative distance-based assessment (CODAS) presented the best result for the cost metrics with the lowest levels, and for the benefit metrics, the highest levels were obtained.
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Fonfa, Ann. "Integrative oncology from the patient advocate perspective." Journal of Clinical Oncology 32, no. 26_suppl (2014): 133. http://dx.doi.org/10.1200/jco.2014.32.26_suppl.133.
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133 Background: As a 20+ year breast cancer survivor I sought to find and offer information on natural cancer strategies. At first I needed them for my own cancer protocol, then to help others Integrative Oncology refers to the simple, natural and non-toxic approaches that can reduce toxicity, possibly enhance the efficacy of conventional treatment, and create feelings of well-being and control in people dealing with cancer. Many studies, some from long ago, have pointed to the strong patient interest in Integrative Oncology (formerly known as CAM). Yet the professional oncology community’s knowledge has failed to keep up. Trained to seek level 1 studies, they have failed to note the preponderance of all the other evidence available supporting natural approaches. Due to cost, most natural products/substances are not reviewed at level 1 and probably will never be. Methods: We’ve created a simple program we call 3 Steps 4 Health, which offers anyone in cancer treatment a guide to improved health. We will present the research that backs up these simple ideas that can be incorporated into anyone’s protocol. We also have a handout to reduce toxicities that is evidence-based to help with those adverse effects that plague modern cancer patients. So many suffer from neuropathy – there are quite a few methods to protect or treat this with complementary therapies that can be integrated into conventional treatment. Results: ASCO has pointed to the value of Yoga, of ginger, and other natural approaches but oncology professionals have been slow to adopt or recommend. Conclusions: We will provide evidence-based information on integrative oncology and the 3 Steps 4 Health program.
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Falah, Fajrul. "Kepercayaan dan Hegemoni dalam Cerpen “Makelar” Karya Sri Lima R.N. (Kajian Hegemoni Gramsci)." Nusa: Jurnal Ilmu Bahasa dan Sastra 14, no. 2 (2019): 136. http://dx.doi.org/10.14710/nusa.14.2.136-146.
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This study aims to express the trust and hegemony in the "Broker" short story by Sri Lima R.N. This research is motivated by the idea that language in fiction or short stories is meaningful and indicated not to be neutral. The language in the short story, became the media for sending message content to the author as a reflection of the social community referred to. The approach used in this study is the sociology of literature, specific to the study of Gramsci hegemony. The research method used is descriptive qualitative. Research data obtained from text, words, phrases, sentences, contained in short stories related to trust and hegemony. The research data is then described and expressed based on the approach used. The results of the study show that there was a change in the characteristics of Handoko's character as a broker who was initially good, become opportunist. Brokerage profession is used as a tool to hegemony the public to get profits. Community trust in brokers and people who are considered smart also grow. However, Handoko's figure was eventually protested by people who had used their services and failed. Handoko or brokers run away from the protests and demands of the people.
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Fitri, Yuliani, and Haryati Octarini. "Pengembangan Handout dengan Pendekatan Problem Based Learning (PBL) untuk Meningkatkan Kemampuan Pemahaman Konsep Matematika Siswa Kelas VII SMP Negeri 25 Padang." Math Educa Journal 1, no. 1 (2020): 74–85. http://dx.doi.org/10.15548/mej.v1i1.1543.
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The study was aimed to develop teaching material, hand out, using problem based learning useful to increase concept understanding of junior high school students in grade VII. Product quality valued by validity and practicality aspects. This study is a kind of research and development with procedure referred to 4–D developing models; define, design, develop, disseminate. However, the study was conducted to development aspect due to the limitation of research. The subjects of the study were the students of the VII grade of SMPN 25 Padang with 32 students. Furthermore, final test was conducted to see the ability of students’ concept understanding. Based on data analysis, data shows that : 1). Validity quality of the product met the valid criteria with lesson plan percentage mean 83,3 %, very valid category and the mean of hand out 80,1 %, valid category. 2). Product practicality quality met practical criteria, based on the questionnaire percentage mean filled by the students, 84 %, very practice category. 3). The result of students’ final test of concept understanding ability was 81 %, 26 from 32 students passed the test, 6 students failed based on school passing standard.
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Agazue, Chima. "“Four of my Lecturers Including my HOD Took Sexual Interest in Me”: Factors Facilitating Sexual Harassment and Exploitation in Nigerian Higher Education Institutions." International Journal of Criminology and Sociology 12 (December 25, 2023): 220–45. http://dx.doi.org/10.6000/1929-4409.2023.12.18.
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For decades, Nigerian higher education institutions (HEIs) have featured as places where sex is used to determine who gets decent marks and who gets the opposite in what is popularly known as “sex-for-marks” in the country. It is common knowledge to Nigerians that many female students have been prevented from passing their coursework or completing their programmes of study for refusing to engage in sexual activities with their lecturers when demanded. Many male lecturers, including professors, have been dismissed, suspended, put on probation, or prosecuted for sexually harassing or exploiting female students. Available evidence suggests that this phenomenon cuts across both public and private institutions across the country although it is more common in public institutions. This current study explored this phenomenon. The qualitative approach was adopted. Both primary and secondary data were utilised. Primary data were gathered through semi-structured interviews of 22 female graduates and undergraduates of 11 HEIs. Secondary data came from 8 media outlets. The data were thematically analysed. Nine themes were developed from the data, which denoted the primary factors contributing to this menace, and these are (i) project supervision, (ii) being unique, (iii) being a fresher, (iv) tuition fee debt, (v) failed assessment, (vi) exam malpractice, (vii) missed submission deadline, (viii) failing to purchase handout, and (ix) sexual obsession. These themes were analysed in depth and supported with excerpts containing the original words of the victims while pseudonyms or fictitious names were used to replace the real names of the participants. Recommendations were made on how the authorities of HEIs can effectively address this social problem.
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Mitteldorf, Darryl, and Jerrod Nelms. "Are prostate cancer treatments correlated to sleep distress?" Journal of Clinical Oncology 36, no. 6_suppl (2018): 347. http://dx.doi.org/10.1200/jco.2018.36.6_suppl.347.
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347 Background: Sleep distress associated with prostate cancer due to emotional issues like anxiety is well documented. But there have been no investigations focused on sleep distress correlated to specific types of prostate cancer treatments. Methods: During a ten day period in July, 2016, 963 men diagnosed with prostate cancer completed an online survey containing demographic and treatment history questions, the Pittsburg Sleep Quality Index (PSQI) and a current state of health self-assessment. The subjects were randomly chosen from the Malecare prostate cancer support network in the United States and completed the survey. 27% of survey subjects reported being initially diagnosed with Gleason 8 or higher. 42% reported using either androgen deprivation therapy, Zofigo, Xtandi or Xofigo within three months of our survey. Only 5% had been continually on active surveillance. We compiled the PSQI Component score and correlated the scores to a specific prostate cancer treatments, adjudicating for pre-existing conditions such as emotional disorders or apnea. We stratified for race, age, sexual orientation and if the subject had a sleep partner. Results: The PSQI handout says that a total score of 5 or greater indicates sleep distress worthy of consultation with a healthcare provider. Our investigation also considered a “4” to indicate poor sleep quality among participants. Only 398 (41.33%) of our participants scored less than 5 on the PSQI, while only 232 (24.09%) scored less than 4. From these statistics, we showed that over 75% of our study sample suffered sleep distress. However, our analysis failed to disclose significant correlations between specific types of prostate cancer treatments and extent of sleep distress. We did not see correlations regarding subject’s age, race, sleep co-habitation, time from diagnosis to survey and other treatment and demographic stratifications. Conclusions: Sleep distress is well established and broadly experienced by prostate cancer patients. Our study showed there is no advantage to any specific prostate cancer treatment in terms of sleep distress. We also found that severity and instances of sleep distress are distributed without significance across age, race, sexual orientation and time to treatment after diagnosis.
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Epper, Mark, and John Charters. "THE ENVIRONMENT FOR RAISING FUNDS FOR PETROLEUM EXPLORATION IN THE 1990s." APPEA Journal 31, no. 1 (1991): 545. http://dx.doi.org/10.1071/aj90040.
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Private shareholders' equity has traditionally funded greenfield exploration programs in Australia in the 1980s. In the next decade junior exploration companies will again need to rely on funding from both current and potential shareholders. However, the major difference between the 1980s and the 1990s will be the level of difficulty for companies seeking to raise funds. Recent events have sapped potential investor confidence, particularly private investors, and notably, in oil and gas exploration companies.The recent events in the Middle East and the need for some degree of energy self-sufficiency make investment in oil exploration essential for Australia right now. Exploration requires substantial amounts of risk capital which, at this time, is not flowing from traditional sources. Rather, we are seeing a concentration of ownership in the hands of financial institutions and a handful of producing companies and foreign multinationals. It is essential for the Federal Government to recognise the need to offer further incentives to encourage the private sector to invest in exploration companies. In this paper we suggest that the most effective mechanism for such incentives is through some minor modifications to the Australian taxation system.The oil exploration industry must pursue Government in a co-ordinated manner for assistance in raising funds particularly as the requirement for action is urgent. Industry bodies, such as the Australian Petroleum Exploration Association Ltd (APEA) have recently petitioned the Federal Government with recommendations but the Government has failed to accept these proposals on the grounds that they are inconsistent with present tax policy. If this is the case it is time present policy was changed.Clearly, all exploration companies will take whatever action is possible to raise funds for exploration and not simply look in vain for government salvation by handout. However, in the interests of Australian national security, the government has a responsibility to encourage and foster oil and gas exploration.Since planning for this paper commenced in July 1990, oil prices have leapt from US$18 to approximately US$40 per barrel. Should prices such as these (not experienced since the early 1980s) continue, it will make investment in exploration companies more attractive to all investors while at the same time it will test severely the endurance of the equity market generally.
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Shin, Jee Yon, Sung-Soo Park, Gi June Min, et al. "Comparable Outcomes between Unrelated Donor (8/8 or 7/8 matched) and Haploidentical Donor for Allogeneic Stem Cell Transplantation in Adult Patients with Severe Aplastic Anemia." Blood 134, Supplement_1 (2019): 4619. http://dx.doi.org/10.1182/blood-2019-130419.
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Background Either allogeneic hematopoietic stem cell transplantation (SCT) from HLA-matched sibling donor or immunosuppressive therapy (IST) has been recommended as one of the standard treatments for severe aplastic anemia (SAA). Regarding only 30% of chance finding HLA‐matched sibling donor, SCT from an alternative donor including unrelated (URD) or haplo-identical related donor (HAPLO) is considered to be a treatment option after failure to IST in patients who lack of a HLA-matched sibling donor. The aim of this study was to compare the outcomes of URD SCT and HAPLO SCT for SAA patients. Method Consecutive 152 adult patients with SAA who received first SCT between March 2002 and May 2018 were included: 73 of HLA-well-matched (8/8) URD (WM-URD), 34 of HLA-mismatched URD (MM-URD), and 45 of HAPLO. With the intention to have a follow-up period at least 1 year, data were analyzed at May 2019. A conditioning regimen with total body irradiation (TBI) and cyclophosphamide was used for URD-SCT, whereas that with TBI and fludarabine was administered for HAPLO-SCT (Lee et al, BBMT 2011;17:101, Park et al, BBMT 2017;23:1498, Lee et al, Am J Hematol 2018;93:1368). The combination of tacrolimus and methotrexate were used as graft-versus-host disease (GVHD) prophylaxis. Results The median follow-up was 53.4 (range, 0.2-174.1) months. The median age of URD and HAPLO cohort was 30 (range 18-59) and 34 (range 18-59) years, respectively. Except for one and three patients who failed respective a neutrophil and platelet engraftment, other patients achieved neutrophil and platelet engraftments with median 11 and 15 days for WM-URD, 13 and 16.5 days for MM-URD, and 12 and 14 days for HAPLO, respectively. The five-years overall survival (OS), failure-free survival (FFS), and cumulative incidences (CIs) of graft-failure and transplant-related mortality were similar among three groups: 88.3%, 85.5%, 2.7%, and 11.7% for WM-URD; 81.7%, 81.7%, 0%, and 18.3% for MM-URD, and 86.3%, 84.1%, 6.7%, and 9.2% for HAPLO. The 180-days CI of grade II-IV acute GVHD in WM-URD, MM-URD and HAPLO were 35.6%, 52.9%, and 28.9%, respectively; and moderate to severe chronic GVHD were 28.7%, 38.7% and 11.8% in respective cohort. The CI of grade II-IV acute GVHD and moderate to severe chronic GVHD were significantly higher in MM-URD than those in HAPLO (both, p=0.026). ATG is the only factor affecting both grade II-IV acute GVHD (Hazard ratio 0.511, p=0.01) and moderate to severe chronic GVHD (Hazard ratio 0.378, p=0.003) in multivariate analysis. Other complications including CMV DNAemia, hemorrhagic cystitis, invasive fungal disease, secondary malignancy, and sinusoidal obstruction syndrome were similar among three groups. Survival outcomes of a subgroup of ≥ 2 allele MM-URD (n=16) extracted form MM-URD were inferior that of other donor types (n=136): 75.0% vs. 86.9% (p=0.163) for 5-year OS and 75.0% vs. 84.7% (p=0.272) for 5-year FFS. Conclusion This study shows that there were no significant differences between alternative donor sources in the absence of suitable matched sibling donor. Host/donor features and urgency of transplant should drive physician towards the best choice among alternative donor sources for SAA patients treated with SCT. However, selection of ≥ 2 allele MM-URD should not be recommended due to high incidence of GVHD and inferior outcomes. Figure Disclosures Kim: Celgene: Consultancy, Honoraria; Astellas: Consultancy, Honoraria; Hanmi: Consultancy, Honoraria; AGP: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees; SL VaxiGen: Consultancy, Honoraria; Novartis: Consultancy; Amgen: Honoraria; Chugai: Honoraria; Yuhan: Honoraria; Sanofi-Genzyme: Honoraria, Research Funding; Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees; Handok: Honoraria; Janssen: Honoraria; Daiichi Sankyo: Honoraria, Membership on an entity's Board of Directors or advisory committees; BL & H: Research Funding; Otsuka: Honoraria. Lee:Alexion: Consultancy, Honoraria, Research Funding; Achillion: Research Funding.
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Page, Brian R., Reeve Lambert, Jalil Chavez‐Galaviz, and Nina Mahmoudian. "Underwater Docking Approach and Homing to Enable Persistent Operation." Frontiers in Robotics and AI 8 (March 15, 2021). http://dx.doi.org/10.3389/frobt.2021.621755.
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One of the main limiting factors in deployment of marine robots is the issue of energy sustainability. This is particularly challenging for traditional propeller-driven autonomous underwater vehicles which operate using energy intensive thrusters. One emerging technology to enable persistent performance is the use of autonomous recharging and retasking through underwater docking stations. This paper presents an integrated navigational algorithm to facilitate reliable underwater docking of autonomous underwater vehicles. Specifically, the algorithm dynamically re-plans Dubins paths to create an efficient trajectory from the current vehicle position through approach into terminal homing. The path is followed using integral line of sight control until handoff to the terminal homing method. A light tracking algorithm drives the vehicle from the handoff location into the dock. In experimental testing using an Oceanserver Iver3 and Bluefin SandShark, the approach phase reached the target handoff within 2 m in 48 of 48 tests. The terminal homing phase was capable of handling up to 5 m offsets with approximately 70% accuracy (12 of 17 tests). In the event of failed docking, a Dubins path is generated to efficiently drive the vehicle to re-attempt docking. The vehicle should be able to successfully dock in the majority of foreseeable scenarios when re-attempts are considered. This method, when combined with recent work on docking station design, intelligent cooperative path planning, underwater communication, and underwater power transfer, will enable true persistent undersea operation in the extremely dynamic ocean environment.
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Cesar, Hernández, Giral Diego, and Páez Ingrid. "Hybrid Algorithm for Frequency Channel Selection in Wi-Fi Networks." October 2, 2015. https://doi.org/10.5281/zenodo.1110067.
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This article proposes a hybrid algorithm for spectrum allocation in cognitive radio networks based on the algorithms Analytical Hierarchical Process (AHP) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) to improve the performance of the spectrum mobility of secondary users in cognitive radio networks. To calculate the level of performance of the proposed algorithm a comparative analysis between the proposed AHP-TOPSIS, Grey Relational Analysis (GRA) and Multiplicative Exponent Weighting (MEW) algorithm is performed. Four evaluation metrics are used. These metrics are accumulative average of failed handoffs, accumulative average of handoffs performed, accumulative average of transmission bandwidth, and accumulative average of the transmission delay. The results of the comparison show that AHP-TOPSIS Algorithm provides 2.4 times better performance compared to a GRA Algorithm and, 1.5 times better than the MEW Algorithm.