• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2002년도 춘계종합학술대회
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• pp.90-95
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• 2002

본 논문에서는 보다 적은 Network 자원의 사용으로 높은 서비스 품질을 보장할 수 있는 원격 화상 강의 시스템을 분석하고 구현한다. 기존의 화상강의 시스템의 대부분은 다자간 회의 방식이 아닌 점대점방식으로 설계되어 있다. 그러나 현재와 앞으로의 원격 화상 강의 시스템은 다자간의 화상 강의 시스템으로서의 화장과 사용자에 대해 높은 서비스 품질이 보장되어질 것이 요구되고 있다. 이런 문제를 해결하기 위해 Network 대역폭의 증가와 더불어 Network 차원의 멀티캐스트 전송기술이 적용되어야 하고, 고성능의 진보된 압축기술이 화상회의 시스템에 적용되어져야 한다. 본 논문에서 제안한 시스템은 차세대 인터넷이 초고속 Network라는 특성을 기반으로 대중화될 원격 화상 강의 시스템으로써 하나의 응용서비스를 제공한다.

• 한국발생생물학회지:발생과생식
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• 제22권4호
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• pp.393-402
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• 2018

Genomic DNA was isolated from the Gracilaria vermiculophylla (GRV) and G. chorda (GRC) from Jangheung located in the southern sea of the Korean Peninsula, respectively and we performed clustering analyses, DNA polymorphisms and the genetic differences. The seven selected primers OPC-01, OPA-04, OPA-05, OPD-07, OPD-08, OPB-10, and OPD-16 generated average bandsharing (BS) value, the genetic distance and dendrogram. The size of DNA bands varies from 90 bp to 2,400 bp. The average BS value was $0.859{\pm}0.004$ within GRV and $0.916{\pm}0.006$ within GRC. The average BS value between two Gracilaria species was $0.340{\pm}0.003$, ranged from 0.250 to 0.415. The dendrogram obtained by the seven primers, indicates two genetic clusters. The genetic distance between two Gracilaria species ranged from 0.059 to 0.513. The individual VERMICULOPHYLLA no. 07 of GRV was genetically closely related to VERMICULOPHYLLA no. 06 of GRV (genetic distance=0.059). Especially, two entities between the individual VERMICULOPHYLLA no. 10 of GRV and CHORDA no. 22 of GRC showed the longest genetic distance (0.513) in comparison with other individuals used. Accordingly, as mentioned above, PCR analysis showed that the GRV was a little more genetically diverse than the GRC species. We convinced that this DNA analysis revealed a significant genetic distance between two Gracilaria species pairs (p<0.01).

• 한국발생생물학회지:발생과생식
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• 제23권2호
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• pp.193-198
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• 2019

Genomic DNA samples were obtained from cultured penaeid shrimp (Penaeus chinensis) individuals such as fresh shrimp population (FSP) and deceased shrimp population (DSP) from Shinan regions in the Korean peninsula. In this study, 233 loci were identified in the FSP shrimp population and 162 in the DSP shrimp population: 33 specific loci (14.2%) in the FSP shrimp population and 42 (25.9%) in the DSP population. A total of 66 (an average of 9.4 per primer) were observed in DSP shrimp population, whereas 55 unique loci to each population (an average of 7.9 per primer) in the FSP shrimp population. The Hierarchical dendrogram extended by the seven oligonucleotides primers indicates three genetic clusters: cluster 1 (FRESH 01, 02, and DECEASED 12, 13, 15, 16, 17, 19, 20, 22) and cluster 2 (FRESH 03, 04, 05, 06, 07, 08, 09, 10, 11, and DECEASED 14, 18, 21). Among the twenty-two shrimp, the shortest genetic distance that exposed significant molecular differences was between individuals 20 and 16 from the DSP shrimp population (genetic distance=0.071), while the longest genetic distance among the twenty-two individuals that established significant molecular differences was between individuals FRESH no. 02 and FRESH no. 04 (genetic distance=0.477). In due course, PCR analysis has revealed the significant genetic distance among two penaeid shrimp populations.

• 대한한의학회지
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• 제27권2호
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• pp.225-231
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• 2006

Objectives : This study was performed to determine if unknown species of antler samples could be identified by genetic distance methods. Methods : The DNAs of 4 antler samples were extracted, amplified by PCR, and sequenced. The DNAs of antlers were identified by genetic distance. Genetic distance method was made using MEGA software (Molecular Evolutionary Genetics Analysis, 3.1). Results : By genetic distance methods, all 4 antler samples were closest to Cervus elaphus nelsoni among Cervus species. Conclusion : These results suggest that genetic distance methods might be used as a tool for the identification of Cervus species.

• Journal of Electrical Engineering and Technology
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• 제5권4호
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• pp.522-529
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• 2010

Distance relay plays an important role in the protection of transmission lines. The application of flexible AC transmission systems (FACTS) devices, such as the static synchronous compensator (STATCOM), could affect the performance of the distance relay because of compensation effect. This paper analyzes the application of distance relay on the protection of a transmission line containing STATCOM. New setting principles for different protection zones are proposed based on this analysis. A typical 500 kV transmission system employing STATCOM is modeled using Matlab/Simulink. The impact of STATCOM on distance protection scheme is studied for different fault types, fault locations, and system configurations. Based on simulation results, the performance of distance relay is evaluated. The setting principle can be verified for the transmission line with STATCOM.

• Communications for Statistical Applications and Methods
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• 제27권6호
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• pp.589-602
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• 2020

The development of smart grids has enabled the easy collection of a large amount of power data. There are some common patterns that make it useful to cluster power consumption patterns when analyzing s power big data. In this paper, clustering analysis is based on distance functions for time series and clustering algorithms to discover patterns for power consumption data. In clustering, we use 10 distance measures to find the clusters that consider the characteristics of time series data. A simulation study is done to compare the distance measures for clustering. Cluster validity measures are also calculated and compared such as error rate, similarity index, Dunn index and silhouette values. Real power consumption data are used for clustering, with five distance measures whose performances are better than others in the simulation.

• International Journal of Computer Science & Network Security
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• 제23권4호
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• pp.151-155
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• 2023

The main purpose of the article is to analyze the practice of overcoming during distance learning of students-future teachers of a preschool education institution. The key aspects of practical activities to counter a stressful situation during distance learning of students-future teachers of a preschool education institution are identified. The research methodology includes a number of methods designed to analyze the practice of coping with stress during distance learning of students. The results of the study include the definition of the main elements of practical activities to counteract stress and stressful situations of different scales in the distance learning of students-future teachers of a preschool education institution. Further research requires the analysis of international experience in dealing with a stressful situation during distance learning of students.

• 대한물리의학회지
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• 제5권1호
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• pp.15-24
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• 2010

Purpose : The purpose of this study was to investigate the effect of loading position on plantar center of pressure(COP) displacement when carrying a schoolbag during walking. Methods : Forty-four normal subjects were randomly assigned to five groups according to the method of carrying a schoolbag. The carrying a schoolbag methods were classified into five conditions: no bag (condition 1), a backpack (condition 2), a shoulder bag (condition 3), a cross bag (condition 4), a one-hand bag (condition 5). COP displacement such as anteroposterior distance and mediolateral distance of COP were measured with F-scan system. The repeated one-way analysis of variance (ANOVA) and independent t-test were used to confirm the statistical significance. Results : In the comparison of parameters of COP displacement between conditions, anteroposterior distance and mediolateral distance in the left foot and mediolateral distance in the right foot were not significantly different(p>.05), but anteroposterior diatance in the right foot was significantly different(p>.05). Between left and right foot, at condition 1 and 5 the mediolateral distance of COP was significantly different(p<.05) but anteroposterior distance at condition 1 and 5, anteroposterior distance and mediolateral distance of COP at condition 2, 3 and 4 were not significantly different(p>.05). Conclusion : These findings showed that the various loading position by five types of carrying a schoolbag didn't have influence significantly on COP displacement on during walking because of mechanism of postural adaption.

• 한국시뮬레이션학회논문지
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• 제17권4호
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• pp.41-50
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• 2008

본 연구에서는 거리기준 위치등록(Distance-Based Registration, DBR) 방법의 성능 개선 방안을 제안하고 그 성능을 분석한다. DBR 방법에서는 이동국이 새로운 셀에 진입할 때마다 현재 셀에서 가장 최근에 위치등록한 셀까지의 거리를 계산하여, 그 값이 기준거리 D 이상이면 위치등록을 수행하게 된다. 본 연구에서는 기존DBR 방법의 성능을 개선하기 위하여 2개의 위치영역을 가질 수 있는 이중영역 거리기준 위치등록(Two-Location Distance-Based Registration, TDBR) 방법을 제안하였다. TDBR에서는 이동국이 가장 최근에 위치등록한 위치영역뿐만 아니라 그 직전에 위치등록한 위치영역까지도 저장하게 되며 이 경우 저장된2개 위치영역을 넘나들 때는 위치등록이 필요 없게 된다. 반면에 페이징 부하는 DBR보다 증가하게 되므로 줄어드는 위치등록 부하와 늘어나는 페이징 부하의 절충이 필요하게 된다.본 연구에서는 육각형 셀 환경 하에서2차원 랜덤워크 모형에 기반을 둔 이동성 모형을 이용하여 두 위치등록 방법의 성능을 분석하고 비교하였다. 시뮬레이션과의 비교를 통하여 수리적 분석이 정확함을 보였으며, 다양한 환경에 대한 수리적 결과로부터 제안하는 TDBR 방법이 기존의 DBR 방법보다 대부분의 경우 성능이 우수함을 알 수 있었다.

• 한국컴퓨터정보학회논문지
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• 제26권7호
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• pp.119-126
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• 2021

COVID-19의 장기화에 따라 상당 기간 원격강의가 이어질 것으로 예상되는 현실에서 원격강의 품질과 학습자 만족에 영향을 미치는 요인에 관한 연구는 반드시 필요하다. 본 연구의 목적은 원격강의품질(시스템품질, 정보품질, 서비스품질, 상호작용품질)과 자기효능감 및 학습자 만족의 관계를 알아보고, 원격강의의 효과적인 운영을 위한 이론적, 실무적 시사점을 제시하고자 한다. 원격강의 수강 대학생을 대상으로 설문조사가 이루어졌으며 197개의 설문지를 실증분석에 사용하였다. 수집된 데이터의 분석을 위해 SPSS 25.0과 AMOS 21.0을 이용하였다. 그 결과; 첫째, 원격강의품질(시스템품질, 정보품질, 서비스품질, 상호작용품질)은 자기효능감에 긍정적인 영향을 미치는 것으로 나타났다. 둘째로, 원격강의품질(시스템품질, 정보품질, 서비스품질, 상호작용품질)은 학습자 만족에 긍정적인 영향을 미치는 것으로 나타났다. 셋째, 자기효능감은 학습자 만족에 긍정적인 영향을 미치는 것으로 나타났다. 분석 결과를 바탕으로 본 연구의 시사점과 한계점을 제시하였다.