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A PSO based Energy Efficient Coverage Control Algorithm for Wireless Sensor Networks

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Computers, Materials & Continua 2018年第9期56卷 433-446页

作者： Jin Wang Chunwei Ju Yu Gao Arun Kumar Sangaiah gwang-jun kim School of Computer&Communication Engineering Changsha University of Science&TechnologyChangsha410114China School of Information Engineering Yangzhou UniversityYangzhou225009China School of Computing Science and Engineering Vellore Institute of TechnologyVellore632014India Department of Computer Engineering Chonnam National UniversityGwangju61186Korea

Wireless Sensor Networks(WSNs)are large-scale and high-density networks that typically have coverage area *** addition,a random deployment of sensor nodes cannot fully guarantee coverage of the sensing area,which leads to coverage holes in ***,coverage control plays an important role in *** alleviate unnecessary energy wastage and improve network performance,we consider both energy efficiency and coverage rate for *** this paper,we present a novel coverage control algorithm based on Particle Swarm Optimization(PSO).Firstly,the sensor nodes are randomly deployed in a target area and remain static after ***,the whole network is partitioned into grids,and we calculate each grid’s coverage rate and energy ***,each sensor nodes’sensing radius is adjusted according to the coverage rate and energy consumption of each *** results show that our algorithm can effectively improve coverage rate and reduce energy consumption.

关键词： Particle swarm optimization coverage control energy efficiency wireless sensor networks

Brain activation patterns associated with sexual orientation in homosexual male and female: a case study with 3.0T fMRI

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Journal of Biomedical Science and Engineering 2011年第3期4卷 196-199页

作者： gwang-Won kim gwang-woo Jeong Jong-Chul Yang 不详

This study was performed to clarify the sexual orien-tation in a 19-year-old homosexual male and a 20-year-old homosexual female by using a functional magnetic resonance imaging (fMRI) with viewing male and female erotic nude pictures. The sex hor-mone levels of the homosexual male and female were in the normal range of healthy heterosexual males and females, respectively. In both homosexuals more significant brain activities were observed while view-ing the nude pictures of the same genetic sex than those of the opposite sex in the frontal cortex, parietal cortex, occipital cortex, anterior cingulate gyrus, amygdala, midbrain, hippocampus, orbitofrontal cortex, parahippocampal gyrus, thalamus, globus pallidus, and putamen, which are known to be re-sponsive to sexual arousal. The homosexual male and female showed a tendency toward higher sexual arousal to the same genetic sex as comparison with the opposite sex. This finding may be useful to un-derstand the different neural mechanisms on sexual arousal in homosexuals.

关键词： Sexual orientation Homosexual male Homosexual female Functional magnetic resonance imaging (fMRI)

Efficient electron extraction of SnO_(2) electron transport layer for lead halide perovskite solar cell

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维普期刊数据库

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npj Computational Materials 2020年第1期6卷 836-843页

作者： Junu kim Kwang S.kim Chang woo Myung Center for Superfunctional Materials Department of PhysicsSchool of Natural ScienceUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Center for Superfunctional Materials Department of ChemistrySchool of Natural ScienceUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea

SnO_(2) electron transport layer(ETL)has been spotlighted with its excellent electron extraction and stability over TiO_(2) ETL for perovskite solar cells(PSCs),rapidly approaching the highest power conversion ***,how... 详细信息

关键词： ETL layer perovskite

Estimation of genetic parameters on growth characteristics of a 35-year-old Pinus koraiensis progeny trial in South Korea

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维普期刊数据库

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Journal of Forestry Research 2021年第5期32卷 2227-2236页

作者： Kyungmi Lee In Sik kim Seok woo Lee Division of Forest Tree Improvement Department of Forest BioresourcesNational Institute of Forest ScienceSuwonRepublic of Korea

The effects of genetic and environmental factors on Pinus koraiensis growth were studied based on a35 year-old progeny trial composed of open-pollinated offspring of twenty-one plus ***,DBH and volume of the offspring was analyzed using restricted maximum likelihood/best linear unbiased prediction in mixed model *** site and family effects on the three traits were *** distinct growth of offspring by site with disparate climates corroborated the importance of planting species in suitable *** differences by family was significant,emphasizing the importance of identifying families with either superior or inferior *** parental ranking was assigned in the sites,inferring the breeding value of each plus *** estimates of individual heritability(h_(i)^(2))of height,DBH and volume growth were 0.169-0.645,0.108-0.331 and 0.129-0.343 respectively,with higher h_(i)^(2) of the height than DBH on each *** of variance of genetic effect was higher with DBH in some cases,indicating the scope for selection is larger for this trait despite the lower heritability compared to *** the variation between families in terms of the performance stability across sites,consideration of the genotype by environment interaction is required in selecting materials to be used in reforestation with Korean pine.A few families with either superior or inferior performance retained their parental ranking for at least a *** families with increased growth on a particular site were identified,indicating their high breeding value and low *** in the genetic performance of the families by site requires delineation of the breeding region of the species.

关键词： Pinus koraiensis Genetic parameters Genotype by environment interaction Tree improvement Progeny trial

CORE:Common Region Extension Based Multiple Protein Structure Alignment for Producing Multiple Solution

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Journal of Computer Science & Technology 2013年第4期28卷 647-656页

作者： woo-Cheol kim Sanghyun Park Jung-Im Won College of Information Sciences and Technology The Pennsylvania State University University Park Department of Computer Science Yonsei University Research Center of Information and Electronic Engineering Hallym University Chuncheon

Over the past several decades, biologists have conducted numerous studies examining both general and specific functions of proteins. Generally, if similarities in either the structure or sequence of amino acids exist for two proteins, then a common biological function is expected. Protein function is determined primarily based on the structure rather than the sequence of amino acids. The algorithm for protein structure alignment is an essential tool for the research. The quality of the algorithm depends on the quality of the similarity measure that is used, and the similarity measure is an objective function used to determine the best alignment because of their individual strength and weakness However, none of existing similarity measures became golden standard They require excessive filtering to find a single alignment. In this paper, we introduce a new strategy that finds not a single alignment, but multiple alignments with different lengths. This method has obvious benefits of high quality alignment. However, this novel method leads to a new problem that the running time for this method is considerably longer than that for methods that find only a single alignment. To address this problem~ we propose algorithms that can locate a common region （CORE） of multiple alignment candidates, and can then extend the CORE into multiple alignments. Because the CORE can be defined from a final alignment, we introduce CORE＊ that is similar to CORE and propose an algorithm to identify the CORE＊. By adopting CORE＊ and dynamic programming, our proposed method produces multiple alignments of various lengths with higher accuracy than previous methods. In the experiments, the alignments identified by our algorithm are longer than those obtained by TM-align by 17% and 15.48%, on average, when the comparison is conducted at the level of super-family and fold, respectively.

关键词： structure alignment similarity search protein structure

Improved corrosion resistance of Mg alloy AZ31B induced by selective evaporation of Mg using large pulsed electron beam irradiation

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Journal of Materials Science & Technology 2019年第5期35卷 891-901页

作者： woo Jin Lee Jisoo kim Hyung wook Park Department of Mechanical Aerospace and Nuclear Engineering Ulsan National Institute of Science and Technology

Large pulsed electron beam(LPEB) irradiation was employed as a surface treatment of magnesium(Mg)alloy AZ31B to enhance its corrosion and wear resistance. Selective evaporation of Mg induced by LPEB irradiation at an energy density of 5J/cm^2 for 40 cycles has led to the formation of an Al-enriched resolidified layer with nano-grained structure consisting of Mg3.1 Al0.9 metastable phase. The formation of such a re-solidified layer after LPEB irradiation has enabled a decrease in corrosion rate of Mg alloy AZ31B in 3.5% NaCl solution. Different equivalent electrical circuit models were proposed to account for the corrosion behavior of untreated Mg alloy AZ31B and those subjected to LPEB irradiation. A decrease in wear depth when compared to that of the untreated alloy suggests an increase in wear resistance of LPEB-irradiated Mg alloy AZ31B. Adhesive wear is the predominant mechanism of untreated Mg alloy AZ31B while abrasive wear mechanism dominates for LPEB-irradiated Mg alloy AZ31B.

关键词： Magnesium alloys Electron beam treatment Corrosion resistance Microstructure Rapid re-solidification Wear resistance

Artificial synaptic and self-rectifying properties of crystalline(Na_(1-x)K_(x))NbO_(3)thin films grown on Sr_(2)Nb_(3)O_(10)nanosheet seed layers

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Journal of Materials Science & Technology 2022年第28期123卷 136-143页

作者： In-Su kim Jong-Un woo Hyun-Gyu Hwang Bumjoo kim Sahn Nahm Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea

Crystalline(Na_(1-x)K_(x))NbO_(3)(NKN)thin films were deposited on Sr_(2)Nb_(3)O_(10)/TiN/Si(S-TS)substrates at 370°***_(2)Nb_(3)O_(10)(SNO)nanosheets served as a template for the formation of crystalline NKN films at low *** the NKN film was deposited on one SNO monolayer,the NKN memristor exhibited normal bipolar switching characteristics,which could be attributed to the formation and destruction of oxygen vacancy ***,the NKN memristor with one SNO monolayer exhibited artificial synaptic ***,the NKN memristor deposited on two SNO monolayers exhibited self-rectifying bipolar switching properties,with the two SNO monolayers acting as tunneling barriers in the *** conduction mechanism of the NKN memristor with two SNO monolayers in the highresistance state is attributed to Schottky emission,direct tunneling,and Fowler–Nordheim(FN)*** current conduction in this memristor in the low-resistance state was governed by direct tunneling and FN ***,the NKN memristor with two SNO monolayers exhibited large ON/OFF and rectification ratios and artificial synaptic ***,an NKN memristor with two SNO monolayers can be used for fabricating artificial synaptic devices with a cross-point array structure.

关键词： Bipolar switching properties Self-rectifying bipolar switching properties Artificial synaptic properties Crystalline NKN thin film Sr_(2)Nb_(3)O_(10)nanosheet seed layer

Optimal design considering structural efficiency of compressed natural gas fuel storage vessels for automobiles

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 199-204页

作者： Myung-Chang KANG Hyung woo LEE Chul kim National Core Research Center for Hybrid Materials Solution Pusan National University Research Institute of Mechanical Technology Pusan National University

The shape and thickness of the dome were investigated with the aim of optimizing the type II CNG storage vessels by using a finite element analysis technique. The thickness of the liners and reinforcing materials was optimized based on the requirement of the cylinder and dome parts. In addition, the shape of the dome, which is most suitable for type lI CNG storage vessels, was proposed by a process of review and analysis of various existing shapes, and the minimum thickness was established in this sequence： metal liners, composite materials and dome parts. Therefore, the new proposed shape products give a mass reduction of 4.8 kg（5.1%）

关键词： CNG fuel storage vessel mechanical property dome part bursting structural analysis

Current approaches and future directions in the management of pterygium

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International Journal of Ophthalmology(English edition) 2018年第5期11卷 709-711页

作者： Kyoung woo kim Jae Chan kim Graduate School of Chung-Ang University College of Medicine Department of Ophthalmology College of MedicineChung-Ang University Hospital

Pterygium,a common ocular surface disorder,has a complex pathophysiology that may mimic *** is altered expression of cell cycle/proliferation-related factors in pterygium ***,similar to cancer treatments,the management of pterygium ought to be multifactorial based on the patient’s *** therapeutic methods for pterygium are focused on surgical resection in conjunction with antimetabolite use,in addition tissue graft is usually performed in the context of the avoidance of bare ***,future directions in the management of pterygia will likely focus on genetic *** perspective views the pathogenesis of pterygium,its existing therapies as well as current and future challenges in its treatment.

关键词： pterygium tumor recurrence future directions