• 디지털융복합연구
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• 제16권12호
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• pp.343-349
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• 2018

뇌파 정보는 분자 단계에서 행동 및 인지 단계에 이르기까지 생성된 정보의 양이 방대하며, 개인의 고유한 프라이버시영역을 나타내는 중요한 정보로 활용되고 있다. 이에, 뇌파정보의 다양한 정보를 통합하고 뇌파정보를 보호할 수 있는 프레임워크를 제시한다. 제안된 시스템은 전자정부 프레임워크 서버 시스템에 보안기능을 강화한 프레임워크로써, 메타데이터를 활용한 의존성 낮은 웹 애플리케이션 서버 시스템이다. 서버 구축을 위해 스프링 플랫폼의 MVC(Model, Vew And Control)프레임워크 웹 기반 환경에 스프링 시큐리티를 적용한다. 본 시스템은 강력한 보안시스템을 탑재한 독립적이고 경량화된 서버시스템으로 분석된 뇌파 정보를 확인할 수 있다. 이로 인해, 뇌파정보의 웹서비스 보안성을 높이고, 뇌파정보의 프라이버시 보호가 가능하다. 또한, 치매환자나 뇌인지 정보가 요구되는 경우 본 연구를 통해 원격의 실시간 확인 및 분석이 가능하다.

• 인터넷정보학회논문지
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• 제25권1호
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• pp.39-48
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• 2024

코로나19의 발생으로 인한 방역 및 소독업무의 중요성이 높아짐에 따라 소독원을 모집하고 싶은 소독사업자와 일하고 싶은 소독원의 수요가 증가했지만, 구인·구직은 쉽지 않은 실정이며, 소독 업무에 대한 자동화와 업무를 효율적으로 관리할 수 있는 시스템이 필요하다. 따라서 본 논문에서는 O2O 소독 서비스 시스템을 MVC 패턴을 사용하여 설계하고, MySQL, Ejs/BootStrap 뷰, Node.js를 통해 구현한다. 또한, AWS 클라우드 서비스와 연동하여 사용자가 언제 어디서나 시스템을 사용할 수 있게 한다. 제안한 O2O 소독 서비스 시스템을 통해 국내 소독방역 시장의 인력 채용의 어려움을 해결하고, 기존의 비효율적인 소독 업무 프로세스 개선을 기대한다.

• 한국운동역학회지
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• 제14권3호
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• pp.219-233
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• 2004

The purpose of this study was to compare the EMG activities of four-forearm muscles during Kumdo head striking. The four skilled and unskilled Kumdo club members were selected from D university in B city. Investigated muscles were left brachioradialis, right brachioradialis and left flexor carpi radialis, right flexor carpi radialis. Raw EMG data were collected during the head striking motions and the average EMG were calculated by the frame width of 0.05s, and then the average %MVC were calculated. The average %MVC values of each muscle in each group were compared. The results are as follows. 1) In each group, there were no significant statistical differences between every muscle over the all phases. 2) There were significant differences, however, between skilled group and unskilled group. The former got higher average %MVC at left flexor carpi radialis and the latter at right brachioradialis in the ready phase and in the impact phase.

• 대한산업공학회지
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• 제25권3호
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• pp.330-335
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• 1999

The goal of the study is to determine the most sensitive parameter to represent the degree of muscle force and fatigue. Various numerical parameters such as the first coefficient of Autoregressive (AR) Model, Root Mean Square (RMS), Zero Crossing Rate (ZCR), Mean Power Frequency (MPF), Median Frequency (MF) were tested in this study. Ten healthy male subjects participated in the experiment. They were asked to extend their trunk by using the right and left erector spinae muscles during a sustained isometric contraction for twenty seconds. The force levels were 15%, 30%, 45%, 60%, and 75% of Maximal Voluntary Contraction (MVC), and the order of trials was randomized. The results showed that RMS was the best parameter to measure the force level of the muscle, and that the first coefficient of AR model was relatively sensitive parameter for the fatigue measurement at less than 60% MVC condition. At the 75% MVC, however, both MPF and the first coefficient of AR Model showed the best performance in quantification of muscle fatigue. Therefore, the sensitivity of measurement can be improved by properly selecting the parameter based upon the level of force during a sustained isometric condition.

• 한국안전학회지
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• 제27권4호
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• pp.96-100
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• 2012

Low back pain (LBP) is a major issue in modern industrialized society which is mainly caused by manual material handling (MMH) tasks. The objective of this study was to provide scientific data for establishing work standard for Korean workers throughout the laboratory experiment including some specific lifting tasks. Thirty male college students were recruited as participants. The maximum voluntary contraction (MVC), recommended weight limit (RWL), and psychophysical safety weight using Borg's CR-10 scale were studied. Results showed that the RWL was 8.4% MVC higher than the proposed psychophysical safety weight. Based on this result, it is suggested that the NIOSH lifting equation (NLE) should not be directly applied to Korean without reasonable modifications. The ratio of psychophysical safety weight to MVC was ranged from 20.1 to 26.4%. It is expected that use of the methodology in this study may provide better expectation of the work ability of Korean for reducing lower back pains caused by MMH.

• 전기학회논문지
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• 제58권6호
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• pp.1246-1254
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• 2009

The reproducibility of initial value and change over time of surface EMG spike variables(MSA, MSF, MSS, MSD) was investigated in the biceps brachii muscle of 11 healthy subjects. Surface EMG signals were recorded during sustained isometric voluntary contractions for 30 seconds at three contraction levels, 20%, 50%, and 80%MVC, respectively. Each contraction was repeated three times in each of three different days for a total of nine contractions and 99 contractions per %MVC level across the eleven subjects. A total of 297 EMG signals across the different trials, days, subjects, and %MVC levels was saved for the subsequent analysis. The degree of reproducibility was investigated using the intraclass correlation coefficient(ICC) and the standard error of the mean(SEM) based upon the analysis of variance(ANOVA), Results for intercept showed higher reproducibility of the spike variables with about 60%-98% ICC than the variable(ARV, MNF) which had been analyzed before in other researches. And results for slope showed poor reproducibility of the spike variables with about 30%-70% ICC and they were comparable with the variables of other researches.

• 대한물리치료과학회지
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• 제19권1호
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• pp.47-54
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• 2012

Purpose : This study is to know the effect on muscle activity when people use mouse aid or not in computer working environment. Method : 11 people of both sex in their twentieth were tested. As a independent variable, the condition without mouse aid and the condition with movable mouse aid were selected, and as a dependent variable, MVC(%) on four muscles and inconvenience degree(RPE scale) on three body part(wrist, forearm, shoulder) were measured. Result : Analyzing the research, MVC(%) of extensor muscle of finger had notably higher muscle activity than other muscles, and there wasn't notable difference in muscle activity before and after using mouse aid. In case of using mouse aid, we tested by giving RPE questionnaire which segmentalized mental fatigue degree into hand, forearm, and shoulder, and resultingly, there wasn't notable differences perspectively. However, people felt less tiredness subjectively after they use the mouse aid. Conclusion : The usage of mouse aid seems to give comfort to computer users.

• 대한의용생체공학회:의공학회지
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• 제34권1호
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• pp.1-7
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• 2013

According to the frequent use of mobile devices, risk of repetitive strain injury for the finger joints was increasing recently. The purpose of this study was to investigate the difference of muscular endurance limit of the thumb between adults and children. A total of thirty subjects (15 adults: $41.0{\pm}7.9$ years and 15 children: $9.5{\pm}2.7$ years) was recruited for this experiment. Maximum voluntary contraction (MVC) of the thumb was measured for 100 trials for each subject by using a push-pull gauge. From the maximum peak value obtained, three main factors (MVC, endurance limit, and fatigue index) were defined to quantify fatigue characteristics of the thumb flexor muscle. The experimental results showed that the mean of MVC, endurance limit, and fatigue index of the children were approximately 50% compared to the adults (p < 0.001). From the results of Pearson correlation test, the endurance limit was highly correlated with weight, age, hand length rather than height. Based on this study, children are more vulnerable to repetitive task using the thumb such as text/SNS messaging, gaming, and scrolling.

• 제어로봇시스템학회논문지
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• 제11권5호
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• pp.471-475
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• 2005

Recently, development of digital technology is occupying a large part of multimedia information like character, voice, image, video, etc. Research about video indexing and retrieval progresses especially in research relative to video. This paper proposes the novel notation in order to retrieve MPEG video in the international standards of moving picture encoding For realizing the retrieval-system, we detect DCT DC coefficient, and then we obtain shot to apply MVC(Mean Value Comparative) notation to image constructed DC coefficient. We choose the key frame for start-frame of a shot, and we have the codebook index generating it using feature of DC image and applying PCA(principal Component Analysis) to the key frame. Also, we realize the retrieval-system through similarity after indexing. We could reduce error detection due to distinguish shot from conventional shot detection algorithm. In the mean time, speed of indexing is faster by PCA due to perform it in the compressed domain, and it has an advantage which is to generate codebook due to use statistical features. Finally, we could realize efficient retrieval-system using MVC and PCA to shot detection and indexing which is important step of retrieval-system, and we using retrieval-system over the internet.

• 한국위성정보통신학회논문지
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• 제8권2호
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• pp.68-73
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• 2013

최근의 3D 입체 영상 관련 기술의 발달은 스마트폰을 포함한 모바일 단말에서도 3D 입체 영상 서비스의 상용화를 가능하게 하고 있다. 스마트폰에서의 3D 입체 영상 서비스는 무안경 3D 디스플레이와 스테레오스코픽 3D 기술을 이용하고 있으며, 스테레오스코픽 이미지 관련 기술들은 지속적으로 활발히 연구가 진행되고 있다. 3D 입체 영상 서비스를 위하여 각각 다른 표준 H.264/AVC, H.264/AVC SEI, H.264/MVC가 MPEG에서 제정되었다. 본 논문에서는 최근 새롭게 대두되고 있는 모바일 단말에서의 스테레오스코픽 3D 기술의 발전과 특히 안드로이드 폰에서의 3D 서비스를 위한 비데오 포맷과 기능들에 초점에 맞추어 기술적 특성에 관한 분석을 행함으로서 그 활용성을 확인하였다.