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Energy-Efficient Scheduling for a Cognitive IoT-Based Early Warning System

Computers, Materials & Continua 2022年第6期71卷 5061-5082页

作者： Saeed Ahmed Noor Gul Jahangir Khan Junsu kim su Min kim Department of Electronics Engineering Korea Polytechnic UniversitySiheung15073Korea Mirpur University of Science and Technology Mirpur10250Pakistan Department of Electronics University of PeshawarPeshawar25120Pakistan Sarhad University of Science and Information Technology Peshawar25000Pakistan

Flash floods are deemed the most fatal and disastrous natural hazards globally due to their prompt onset that requires a short prime time for emergency *** Internet of things(CIoT)technologies including inherent characteristics of cognitive radio(CR)are potential candidates to develop a monitoring and early warning system(MEWS)that helps in efficiently utilizing the short response time to save lives during flash ***,most CIoT devices are battery-limited and thus,it reduces the lifetime of the *** tackle these problems,we propose a CIoTbased MEWS to slash the fatalities of flash *** extend the lifetime of the MEWS by conserving the limited battery energy of CIoT sensors,we formulate a resource assignment problem for maximizing energy *** solve the problem,at first,we devise a polynomial-time heuristic energyefficient scheduler(EES-1).However,its performance can be unsatisfactory since it requires an exhaustive search to find local optimum values without consideration of the overall network energy *** enhance the energy efficiency of the proposed EES-1 scheme,we additionally formulate an optimization problem based on a maximum weight matching bipartite ***,we additionally propose a Hungarian algorithm-based energy-efficient scheduler(EES-2),solvable in polynomial *** simulation results show that the proposed EES-2 scheme achieves considerably high energy efficiency in the CIoT-based MEWS,leading to the extended lifetime of the MEWS without loss of throughput performance.

关键词： Flash floods internet of things cognitive radio early warning system network lifetime energy efficiency

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Optimal Cooperative Spectrum Sensing Based on Butterfly Optimization Algorithm

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Computers, Materials & Continua 2022年第4期71卷 369-387页

作者： Noor Gul Saeed Ahmed Atif Elahi su Min kim Junsu kim Department of Electronics Engineering Korea Polytechnic University15073Gyeonggi-doKorea Department of Electronics University of Peshawar25120Pakistan Department of Electrical Engineering Mirpur University of Science of TechnologyAJ&K10250Pakistan Department of Electrical Engineering International Islamic UniversityIslamabad 44000Pakistan

Since the introduction of the Internet of Things(IoT),several researchers have been exploring its productivity to utilize and organize the spectrum *** radio(CR)technology is characterized as the best aspirant for wireless communications to augment IoT *** the CR networks,secondary users(sus)opportunistically get access to the primary users(PUs)spectrum through spectrum *** multipath issues in the wireless channel can fluster the sensing ability of the individual ***,several cooperative sus are engaged in cooperative spectrum sensing(CSS)to ensure reliable sensing *** CSS,security is still a major concern for the researchers to safeguard the fusion center(FC)against abnormal sensing reports initiated by the malicious users(MUs).In this paper,butterfly optimization algorithm(BOA)-based soft decision method is proposed to find an optimized weighting coefficient vector correlated to the sus sensing *** coefficient vector is utilized in the soft decision rule at the FC before making any global *** effectiveness of the proposed scheme is compared for a variety of parameters with existing schemes through simulation *** results confirmed the supremacy of the proposed BOA scheme in both the normal sus’environment and when lower and higher SNRs information is carried by the different categories of MUs.

关键词： Internet of Things cognitive radio network butterfly optimization algorithm particle swarm optimization malicious users genetic algorithm

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Genome wide expression analysis of the effect of Socheongryong Tang in asthma model of mice

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Journal of Traditional Chinese Medicine 2015年第2期35卷 168-174页

作者： Chi-Yeon Lim Hyung-Woo kim Bu-Yeo kim su-In Cho College of Medicine Dongguk University School of Korean Medicine Pusan National University Herbal Medicine Research Division Korea Institute of Oriental Medicine

OBJECTIVE:To investigate the molecular effect of Socheongryong Tang(SCRT,Xiaoqinglong Tang in Chinese) on whole genome level in asthma mouse model by microarray ***:Asthma was induced by intranasal instillation of ovalbumin in *** administration of SCRT on asthma-induced mouse,the expression of genes in lung tissue was measured using whole genome *** functional implication of differentially expressed genes was performed using ontological analysis and the similarity of promoter structure of genes was also ***:Treatment of SCRT restored expression level of many up- or down-regulated genes in asthma model,and this recovery rate means SCRT could regulate a set of genes having specific TFBS binding ***:In this study,we identified a set of genes subjected to similar regulation by SCRT in asthma model in mice.

关键词： Asthma Transcription factors Microarray analysis Genome wide expression Socheongryong Tang(Xiaoqinglong Tang)

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Hepatitis B viral load affects prognosis of hepatocellular carcinoma

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World Journal of Gastroenterology 2014年第34期20卷 12039-12044页

作者： su Jong Yu Yoon Jun kim Department of Internal Medicine and Liver Research Institute Seoul National University College of MedicineSeoul 110-744South Korea

Hepatocellular carcinoma(HCC)is a complex disease that is dually challenging to treat due to underlying chronic liver disease in addition to the cancer *** prognosis of patients with HCC is determined by intrahepatic tumor status and reserved hepatic *** B virus(HBV)is an established major risk factor of HCC development,and HBV viral load is being increasingly recognized as a prognostic factor in the presence of established *** HBV viral load may affect the prognosis of HBV-related HCC patients in several ***,it is associated with more frequent recurrence of HBV-related HCC after ***,it is associated with more occurrence and severity of potentially life-threatening HBV ***,it is associated with more worsened liver function,which limits the therapeutic options for HBV-related ***,directly or indirectly,can induce *** patients with a high HBV DNA level and subsequent active hepatitis,adhesion molecules expressed on the sinusoidal cells are up-regulated and may increase intrahepatic *** progression after treatment can lead to a poor prognosis by reducing number of normal functioning ***,high HBV viral load can affect the prognosis of patientswith HCC by frequent recurrence after treatment for HCC and deterioration of hepatic function associated with HCC *** meta-analysis showed that antiviral treatment reduces HCC recurrence and liver-related mortality after curative therapy of *** the strong relationship between high HBV DNA load and poor survival outcome of HCC patients due to cancer progression,it is expected that long-term antiviral therapy results in the sustained HBV suppression,control of inflammation,reduction in HCC progression,and eventually in improved overall survival.

关键词： Hepatitis B virus DNA Hepatocellular carcinoma Progression Prognosis

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Enhancement of ballistic performance enabled by transformation-induced plasticity in high-strength bainitic steel

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Journal of Materials Science & Technology 2021年第25期84卷 219-229页

作者： Min Cheoljo Selim kim Dong Woo suh Hong Kyu kim Yongjin kim Seok su Sohn sunghak Lee Center for Advanced Aerospace Materials Pohang University of Science and TechnologyPohang37673South Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyPohang37673South Korea Materials Directorate Agency for Defense DevelopmentDaejeon305-600South Korea Department of Materials Science and Engineering Korea UniversitySeoul02841South Korea

High-strength bainitic steels have created a lot of interest in recent times because of their excellent combination of strength,ductility,toughness,and high ballistic mass *** steels have great potential in the fabrication of steel armor *** various approaches and methods have been conducted to utilize the retained austenite(RA)in the bainitic matrix to control mechanical properties,very few attempts have been conducted to improve ballistic performance utilizing transformationinduced plasticity(TRIP)*** this study,high-strength bainitic steels were designed by controlling the time of austempering process to have various volume fractions and stability of RA while maintaining high *** dynamic compressive and ballistic impact tests were conducted,and the relation between the effects of TRIP on ballistic performance and the adiabatic shear band(ASB)formation was *** results show for the first time that an active TRIP mechanism achieved from a large quantity of metastable RA can significantly enhance the ballistic performance of high-strength bainitic steels because of the improved resistance to ASB ***,the ballistic performance can be effectively improved by a very short austempering time,which suggests that the utilization of active TRIP behavior via tuning RA acts as a primary mechanism for significantly enhancing the ballistic performance of high-strength bainitic steels.

关键词： High-strength bainitic steel Ballistic performance Split Hopkinson pressure bar(SHPB) Adiabatic shear band(ASB) Retained austenite(RA) Transformation-induced plasticity(TRIP)

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Impregnation approach for poly(vinylidene fluoride)/tin oxide nanotube composites with high tribological performance

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Journal of Materials Science & Technology 2020年第2期37卷 19-25页

作者： Min su Park Jin Kyu kim Tong-Seok Han Jung Tae Park Jong Hak kim Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul03722Korea Department of Civil and Environmental Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul03722Korea Department of Chemical Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul05029Korea

We report a composite material with the high tribological performance,which consists of onedimensional SnO2 nanotubes(ST)and a high molecular weight poly(vinylidene fluoride)(PVDF)matrix in terms of *** of PVDF in N,N-dimethylformamide(DMF)resulted in a facile penetration of PVDF into the inner hollow voids of ST,leading to the close *** between PVDF and ST results in a beneficial effect on the chain arrangement of PVDF,providing anα-phase with better tribological *** ST incorporation,the friction coefficient decreased by 85.0%to 0.408,and the specific wear rate decreased by 69.1%to 0.412,demonstrating the pivotal role of ST as a self-lubricating material due to a large interactive area and PVDF chain rearrangement.

关键词： SnO2 nanotube Composite Friction coefficient Wear rate

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Optical shaping of the polarization anisotropy in a laterally coupled quantum dot dimer

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Light(Science & Applications) 2020年第1期9卷 1047-1056页

作者： Heedae kim Kwangseuk Kyhm Robert A.Taylor Jong su kim Jin Dong Song sungkyun Park School of Physics Northeast Normal University130024 ChangchunChina Clarendon Laboratory Department of PhysicsUniversity of OxfordOxford OX13PUUK Department of Opto-mechatronics Pusan Nat’l UniversityBusan 609-735Republic of Korea Department of Physics Yeungnam UniversityGyeongsan 712-749Republic of Korea Nano-Photonics Research Center KISTSeoul 136-791Republic of Korea Department of Physics Pusan Nat’l UniversityBusan 609-735Republic of Korea

We find that the emission from laterally coupled quantum dots is strongly polarized along the coupled direction[110],and its polarization anisotropy can be shaped by changing the orientation of the polarized *** the nonresonant excitation is linearly polarized perpendicular to the coupled direction[110],excitons(X_(1) and X_(2))and local biexcitons(X_(1)X_(1) and X_(2)X_(2))from the two separate quantum dots(QD_(1) and QD_(2))show emission anisotropy with a small degree of polarization(10%).On the other hand,when the excitation polarization is parallel to the coupled direction [110],the polarization anisotropy of excitons,local biexcitons,and coupled biexcitons(X_(1)X_(2))is enhanced with a degree of polarization of 74%.We also observed a consistent anisotropy in the time-resolved *** decay rate of the polarized photoluminescence intensity along the coupled direction is relatively high,but the anisotropic decay rate can be modified by changing the orientation of the polarized *** energy difference is also observed between the polarized emission spectra parallel and perpendicular to the coupled direction,and it increases by up to three times by changing the excitation polarization orientation from [110] to [110].These results suggest that the dipole-dipole interaction across the two separate quantum dots is mediated and that the anisotropic wavefunctions of the excitons and biexcitons are shaped by the excitation polarization.

关键词： anisotropy quantum polarized

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Adverse events related to colonoscopy: Global trends and future challenges

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World Journal of Gastroenterology 2019年第2期25卷 190-204页

作者： su Young kim Hyun-Soo kim Hong Jun Park Department of Internal Medicine Yonsei University Wonju College of Medicine

Colonoscopy is a widely used method for diagnosing and treating colonic disease. The number of colonoscopies is increasing worldwide, and concerns about associated adverse events are growing. Large-scale studies using big data for post-colonoscopy complications have been reported. A colon perforation is a severe complication with a relatively high mortality rate. The perforation rate, as reported in large studies(≥ 50,000 colonoscopies) published since 2000, ranges from 0.005-0.085%. The trend in the overall perforation rate in the past 15 years has not changed significantly. Bleeding is a more common adverse event than perforation. Recent large studies(≥ 50,000 colonoscopies) have reported postcolonoscopy bleeding occurring in 0.001-0.687% of cases. Most studies about adverse events related to colonoscopy were performed in the West, and relatively few studies have been conducted in the East. The incidence of post-colonoscopy complications increases in elderly patients or patients with inflammatory bowel diseases. It is important to use a unified definition and refined data to overcome the limitations of previous studies. In addition, a structured training program for endoscopists and a systematic national management program are needed to reduce post-colonoscopy complications. In this review, we discuss the current trends in colonoscopy related to adverse events, as well as the challenges to be addressed through future research.

关键词： Colonoscopy Adverse events Perforation Bleeding Post-colonoscopy

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A Unified Buffering Management with Set Divisible Cache for PCM Main Memory

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Journal of Computer Science & Technology 2016年第1期31卷 137-146页

作者： Mei-Ying Bian su-Kyung Yoon Jeong-Geun kim Sangjae Nam Shin-Dug kim Department of Computer Science Yonsei University Seoul 120-749 Korea

This research proposes a phase-change memory （PCM） based main memory system with an effective combi- nation of a superblock-based adaptive buffering structure and its associated set divisible last-level cache （LLC）. To achieve high performance similar to that of dynamic random-access memory （DRAM） based main memory, the superblock-based adaptive buffer （SABU） is comprised of dual DRAM buffers, i.e., an aggressive superblock-based pre-fetching buffer （SBPB） and an adaptive sub-block reusing buffer （SBRB）, and a set divisible LLC based on a cache space optimization scheme. According to our experiment, the longer PCM access latency can typically be hidden using our proposed SABU, which can significantly reduce the number of writes over the PCM main memory by 26.44%. The SABU approach can reduce PCM access latency up to 0.43 times, compared with conventional DRAM main memory. Meanwhile, the average memory energy consumption can be reduced by 19.7%.

关键词： memory hierarchy memory structure,cache memory buffer management

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Optimal proximal resection margin distance for gastrectomy in advanced gastric cancer

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World Journal of Gastroenterology 2020年第18期26卷 2232-2246页

作者： Amy kim Beom su kim Jeong Hwan Yook Byung Sik kim Division of Stomach surgery Department of SurgeryAsan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of surgery Korea University Medical Center Ansan HospitalAnsanGyeonggi-do 15355South Korea

BACKGROUND The conventional guidelines to obtain a safe proximal resection margin(PRM)of5-6 cm during advanced gastric cancer(AGC)surgery are still applied by many surgeons across the *** recent studies have raised questions regarding the need for such extensive resection,but without reaching *** study was designed to prove that the PRM distance does not affect the prognosis of patients who undergo gastrectomy for *** To investigate the influence of the PRM distance on the prognosis of patients who underwent gastrectomy for *** Electronic medical records of 1518 patients who underwent curative gastrectomy for AGC between June 2004 and December 2007 at Asan Medical Center,a tertiary care center in Korea,were reviewed retrospectively for the *** demographics and clinicopathologic outcomes were compared between patients who underwent surgery with different PRM distances using one-way ANOVA and Fisher’s exact test for continuous and categorical variables,*** influence of PRM on recurrence-free survival and overall survival were analyzed using Kaplan-Meier survival analysis and Cox proportional hazard *** The median PRM distance was 4.8 cm and 3.5 cm in the distal gastrectomy(DG)and total gastrectomy(TG)groups,*** cohorts in the DG and TG groups were subdivided into different groups according to the PRM distance;≤1.0 cm,1.1-3.0 cm,3.1-5.0 cm and>5.0 *** DG and TG groups showed nostatistical difference in recurrence rate(23.5%vs 30.6%vs 24.0%vs 24.7%,P=0.765)or local recurrence rate(5.9%vs 6.5%vs 8.4%vs 6.2%,P=0.727)according to the distance of *** both groups,Kalpan-Meier analysis showed no statistical difference in recurrence-free survival(P=0.467 in DG group;P=0.155 in TG group)or overall survival(P=0.503 in DG group;P=0.155 in TG group)according to the PRM *** analysis using Cox proportional hazard model revealed that in both groups,there was no significant differ

关键词： Stomach neoplasms Gastrectomy Margins of excision Prognosis Recurrence

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