웹기반 회의 (Web Conferencing) 기능에 관한 종단 연구

조영아(Young-Ah Cho),송인석(In-Seok Song) 한국비서학회 2003 비서·사무경영연구 Vol.12 No.1

The use of information technology in the field of conferencing is demanded in the view that it is able to communicate with persons who live in distant places without gathering together. At the end of 1990s, the expanding of super-high speed internet network provided possibility to operate a real time conference through internet. The purpose of this study is to suggest the standards for office professionals to use web conferencing efficiently and to determine the type of web conferencing, through the research to way of operation and tools of web conferencing. With a literature study, research to 19 web conferencing sites by internet in Korea and US was carried out. Through the result of time series analysis of the years of 2000 and 2003, this study found the trend of web conferencing; demand for web conferencing is increasing and functions provided for web conferencing are getting more various. Most web conferencing services and softwares have the functions of presentation, file sharing & transmission, whiteboard as well as chatting and voice. This study proposes that office professionals consider the need for distinction from presenter and audience, software installation, web-based desktop videoconferencing, recording, and functions to use in conferencing. As the study organized of web conferencing, it is expected to utilize as a basis for meeting manager planning and preparing web conferencing.

구조방정식모형을 이용한 사무직 공무원의 직업관련 특성과 직무스트레스가 사회심리적 건강상태에 미치는 영향

조영채(Cho, Young-Chae),권인선(Kwon, In-Sun),배남규(Bae, Nam-Kyou),박재영(Park, Jae-Young) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.6

본 연구는 공무원들의 스트레스나 피로수준과 같은 사회심리적 건강상태가 그들의 직급, 근무경력 등의 직 업관련 특성이나 업무요구도, 업무자율성, 직장 내에서의 사회적 지지와 같은 직무스트레스 내용에 의해 영향을 받고 있는지를 구조방정식모형을 통하여 검토하고자 시도하였다. 연구대상은 대전광역시의 5개 정부 공공기관에 근무하는 일반 사무직 행정공무원 805명이었으며, 자료 수집은 2009년 10월 1일부터 11월 30일까지의 기간 동안에 표준화된 자기기입식 설문지(self-administered questionnaire)를 사용하여 실시하였다. 연구결과, 공무원들의 스트레스 및 피로수 준은 직급, 근무경력, 업무만족도, 업무자율성, 상사의 지지도 및 동료의 지지도와는 유의한 음의 상관관계를 나타낸 반면, 년 간 결근일수, 업무요구도와는 유의한 양의 상관관계를 나타내었다. 구조방정식모형 분석 결과 연구대상자들 의 직무스트레스 요인은 직업관련 특성 요인보다 사회심리적 건강상태에 더 큰 영향을 미쳤으며, 직무스트레스가 높 을수록 사회심리적 건강상태를 나타내는 스트레스와 피로수준을 높여주는 것으로 나타났다. 한편, 직업관련 특성의 인지정도가 높을수록 직무스트레스 요인을 감소시키는 효과가 있는 것으로 나타났다. 따라서 공무원들의 스트레스나 피로를 감소시키기기 위해서는 직업관련 특성에 따른 직무내용의 개선을 위한 프로그램의 개발 및 시행이 필요할 것 으로 생각된다. The effects of job related factors on psychosocial health status were examined by taking job stress into account. The self-administered questionnaires were performed, during the period between Oct. 1st, 2009 and Nov. 30th, 2009, to 805 individuals in the service of general administration located in Daejeon City. Causal relationships between job related factors, job stress, and, psychosocial health status were examined by structural equation model. The main finding as follows: For correlations of such indices of psychosocial health status as PWI and MFS with various studied items, all of these two indices were found to be in a negative correlation with the job position, job career, satisfaction in job life, autonomy of job, supervisors support and coworkers support, whereas in positive correlation with the experience of sick absence per year and job demand. With the analysis of structural equation model, the degree of job stress factors was more influential on the level of psychosocial health status than job related factors in such a manner as that the greater the job stress, while the lower the job related factors, the higher the psychosocial health status(PWI and MFS). Moreover, it was found to have the inter-relational effects that the greater the job related factors, the lower the job stress factors. Thus the effective strategy for stress and fatigue symptoms reduction among governmental employees requires additional programs focusing on innovated job specifications.

아산시 지역에서 과민성 장 증후군의 유병률: 표본인구 설문조사

조영석 ( Young Seok Cho ),최명규 ( Myung Gyu Choi ),신석준 ( Seok Jun Shin ),추교영 ( Kyo Young Choo ),정우철 ( Woo Chul Chung ),이인석 ( In Seok Lee ),김상우 ( Sang Woo Kim ),최황 ( Hwang Choi ),한석원 ( Sok Won Han ),정인식 ( I 대한소화기기능성질환·운동학회 2004 Journal of Neurogastroenterology and Motility (JNM Vol.10 No.1

목적: 우리나라의 과민성 장 증후군과 배변증상의 유병률을 조사하고, 다른 진단 기준을 적용하였을 때 유병률에 차이가 있는 지를 알아보기 위하여 지역사회 주민을 대상으로 무작위 표본추출조사를 시행하였다. 대상 및 방법: 충청남도 아산시 보건소와 협조하여 11개 면과 2개동을 무작위로 선정한 후, 인구에 비례하여 18세 이상 70세 미만의 남녀 2,024명을 무작위로 표본추출하였다. 조사원이 대상가구를 직접 방문하여 배변증상을 설문지로 조사하였다. 결과: 3회 방문에 부재 중이거나 제외기준에 속한 주민을 제외하고, 1,417명(남 762명, 평균 44±14세, 여 655명, 평균 43±15세) 이 설문지를 완료하였다. 로마기준 II에 의한 과민성 장 증후군의 유병률은 2.2% (95% 신뢰구간 [95% CI], 1.4~3.0)이었고, 로마기준 I으로는 2.8% ([95% CI], 1.9~3.7)였다. 복통과 Manning 기준 중 2가지 이상을 만족하는 과민성 장 증후군의 유병률은 3.6% ([95% CI], 2.6~4.6)였다. Manning 기준과 로마기준 I, 그리고 Manning 기준과 로마기준 II간에는 각각 moderate agreement를 나타내었다(κ=0.48; p<0.001), (κ=0.50; p<0.001). 로마기준 I과 로마기준 II간에는 substantial agreement를 나타내어(κ=0.66; p<0.001) 세 가지 진단기준 중 로마기준 I과 로마기준 II의 경우에 일치의 정도가 가장 높았다. 결론: 로마기준 II를 적용하여 표본추출 설문조사에 의한 우리나라의 과민성 장 증후군의 유병률은 2.2%이며, 적용된 진단기준에 따라 차이가 있었다. Backgr ound/Aims: Irritable bowel syndrome (IBS) is common in Caucasians and Japanese, but its epidemiology has not been studied in random Korean populations. It has been suggested that the variation in the prevalence of IBS may be due to the application of different diagnostic criteria. New criteria for IBS have been proposed (Rome II). The aim of this study was to estimate the prevalence of IBS in a random population in Asan city, Korea by using the Bowel Symptom Questionnaire (BSQ), which was based on the multinational, diagnostic, Rome II criteria for functional bowel disorders, as a measure of GI symptoms and to compare diagnostic criteria. Methods: A cross-sectional survey, using a reliable and valid questionnaire based on the fulfillment of the Rome II criteria was performed in a random population in Asan city, Korea, on residents aged 18~69 yr. The response rate was 78.4% (n=1417). All respondents were interviewed at either their homes or offices by a team of interviewers. Results: The prevalence for BS according to the Rome II, Rome I, and Manning criteria was 2.2% (95% confidence interval [CI], 1.4~3.0), 2.8% (95% CI, 1.9~3.7), and 3.6% (95% CI, 2.6~4.6), respectively. There was moderate agreement between the Manning and Rome II criteria (κ=0.48; p<0.001), and between the Manning and Rome II criteria (κ=0.50; p<0.001), but substantial agreement between the Rome I and Rome II criteria (κ=0.66; p<0.001). The prevalence for abdominal bloating was 4.0% (95% CI, 3.0~5.1), for diarrhea was 0.8% (95% CI, 0.3~1.2), and for constipation was 2.6% (95% CI, 1.8~3.5). Conclusions: The prevalence of IBS based on the Rome II criteria was 2.2%. The prevalence of IBS varied substantially depending on the specific definition of IBS used. (Kor J Neur ogastr oenterol Motil 2004;1:49-56)

평블록 조립 공정에 대한 강화학습 기반 스케줄링 알고리즘 개발

조영인(Young In Cho),남소현(So Hyun Nam),우종훈(Jong Hun Woo) (사)한국CDE학회 2021 한국CDE학회 논문집 Vol.26 No.2

Rule-based heuristic algorithms and meta-heuristic algorithms have been studied to solve the scheduling problems of production systems. In recent research, reinforcement learning-based adaptive scheduling algorithms have been studied to solve complex problems with high-dimensional and vast state space. A production system in shipyards is a high-variable system where various production factors such as space, workforce, and resources are related. Adaptive scheduling according to the changes in the production system and surrounding environment must be performed in shipyards. In this paper, the main focus was on building a basic reinforcement learning model for scheduling problems of shipyards. A simplified model of the panel block shop in shipyards was assumed and the optimal policy for determining the input sequence of blocks was learned to reduce the flow time. The open source-based DES simulation kernel Simpy was incorporated into the environment of the reinforcement learning model.

마스킹 형태 변환 알고리즘에 대한 새로운 전력 분석 공격

조영인(Young In Cho),김희석(HeeSeok Kim),한동국(Dong-Guk Han),홍석희(Seokhie Hong),강주성(JuSung Kang) 大韓電子工學會 2010 電子工學會論文誌-SP (Signal processing) Vol.47 No.1

전력 분석 공격의 다양한 대응법들 중 대칭키 암호의 경우, 암/복호화, 키 스케쥴링의 연산 도중 중간 값이 전력 측정에 의해 드러나지 않도록 하는 마스킹 기법이 잘 알려져 있다. 대칭키 암호는 Boolean 연산과 Arithmetic연산이 섞여 있으므로 마스킹 형태 변환이 불가피하다. Messerges에 의해서 일반적인 전력 분석 공격에 안전한 마스킹 형태 변환 알고리즘이 제안되었고 이에 대한 취약성이 보고되었다. 본 논문에서는 Messerges가 제안한 마스킹 형태 변환 알고리즘에 대한 기존 전력 분석공격이 불가능함을 보이고 새로운 전력 분석 공격 방법을 제안한다. 마스킹 형태 변환 알고리즘에 대하여 강화된 DPA와 CPA 공격 방법을 제시한 뒤 시뮬레이션 결과로써 제안하는 공격 방법으로 실제 분석이 가능함을 확인한다. In the recent years, power analysis attacks were widely investigated, and so various countermeasures have been proposed. In the case of block ciphers, masking methods that blind the intermediate results in the algorithm computations(encryption, decryption, and key-schedule) are well-known. The type conversion of masking is unavoidable since Boolean operation and Arithmetic operation are performed together in block cipher. Messerges proposed a masking type conversion algorithm resistant general power analysis attack and then it's vulnerability was reported. We present that some of exiting attacks have some practical problems and propose a new power analysis attack on Messerges's algorithm. After we propose the strengthen DPA and CPA attack on the masking type conversion algorithm, we show that our proposed attack is a practical threat as the simulation results.

우리나라 여자 청소년의 신체활동, 식이행동, 수면에 따른 건강위험행동 군집유형과 정신건강상태와의 관련성

조영은 ( Young Eun Cho ),정인경 ( In Kyung Jung ) 중앙대학교 학교체육연구소 2021 Asian Journal of Physical Education of Sport Scien Vol.9 No.2

본 연구는 우리나라 여자 청소년들의 건강위험행동 실태 및 군집 유형을 파악하고 이에 따른 정신건강상태와의 관련성을 탐색해봄으로써 향후 청소년들의 건강증진을 위한 중재방안을 마련하는데 도움이 되고자 실시하였다. 본 연구에서는 제13차 청소년건강행태 온라인조사의 2017년도 원시자료를 이차분석 하였다. 그 결과, 우리나라 청소년의 전반적인 정신건강상태 및 건강위험행동군의 분포는 중학생보다 고등학생이 부정적인 경우가 많았으며 특히 신체활동 부족군의 비율이 높았고 충분한 수면시간을 갖지 못하는 것으로 나타났다. 4가지의 건강위험행동 군집유형의 경우 학교급별에 따른 차이를 보였으며 특히 건강위험행동을 모두 다 갖거나, 한 가지도 보유하지 않는 패턴의 양극단에서 O/E값이 높게 나타났다. 건강위험행동 군집유형에 따라 주관적 건강상태가 유의한 차이를 보였으며 같은 개수의 건강위험행동을 보유하여도 건강위험행동 군집유형에 따라 정신건강상태에 미치는 영향이 다르게 나타났다. 이상의 결과를 통해 건강위험행동은 상호 밀접한 관련성을 가지며 청소년의 정신건강상태에 영향을 미치고 있어 우리나라 청소년의 정신건강증진을 위해서는 한 가지 위험행동만을 초점으로 한 전략보다는 군집화된 건강위험행동 패턴을 고려한 중재방안을 모색할 필요가 있다. The study was conducted to identify health risk behaviors and cluster types of female adolescents in Korea, explore their mental health status accordingly, and help come up with mediation measures to improve their health in the future. In this study, we analyzed the second raw data in 2017 through the 13th online survey of youth health behaviors. As a result, the overall distribution of mental health conditions and health risk groups among teenagers in Korea was more negative for high school students than middle school students, and there was a lack of sleep time, especially due to lack of physical activity. For cluster types according to the four health risk behaviors, O/E values were high, especially at extremes of patterns that did not do all or any health risk behaviors. Mental health status differed significantly depending on the pattern of clustering of health risk behaviors, and even if the same number of health risk behaviors, the impact on mental health status differed depending on the type of health risk behavior. Since health risk behaviors are closely related to each other and affect the mental health status of adolescents, it is necessary to seek arbitration in consideration of clustered health risk patterns rather than focusing on only one risk behavior.

강화학습 기반 안벽 배치 계획 알고리즘 개발

조영인(Young-In Cho),오승헌(Seung-Heon Oh),곽동훈(Dong-Hoon Kwak),최재호(Jae-Ho Choi),우종훈(Jong Hun Woo) (사)한국CDE학회 2022 한국CDE학회 논문집 Vol.27 No.2

In the shipbuilding, outfitting processes are mainly performed on ships moored by quays of the shipyard. Quays in shipyards have different lengths, depths, and facilities so that the allowable quays for each ship are limited. In addition, the working efficiency of the quay process depends on the kinds of the quays where the outfitting processes are performed. As a result, it is inevitable for ships to move around the quays to avoid delay in schedule while maximizing the working efficiency. The movements of ships should be minimized because it is a waste of cost and time. In most shipyards, the quay allocation is manually determined by planners using their own implicit rules. However, the optimal plan can’t be obtained by those heuristics which only considers limited problem space. In this study, the scheduling algorithm for the quay allocation problem is developed using a reinforcement learning approach. Based on the Markov decision process model using discrete-event simulation, the scheduling agent is trained by DRQN (Deep Recurrent Q-network) algorithm and tested with 10 scenarios. The proposed algorithm outperforms the reference value set by heuristic in terms of three KPIs-unallocated duration, the number of ship movements, and ship-quay priority ratio.

사회적경제 금융상품에 투자의도를 가진 잠재적 투자자들의 특성

조영복(Cho Young bohk),이나영(Lee Na Young),김혜인(Kim Hye in),빈경진(Bin Gyeong Jin),유정용(Yoo Jung Yong),정기범(Jung Ki Bum) 한국비영리학회 2018 한국비영리연구 Vol.17 No.1

본 연구에서는 투자 경험이 있는 일반인을 대상으로 사회적경제 금융상품에 투자 의도를 가진 잠재적 투자자들의 특성에 대해 알아보고자 하였다. 이에 Hershey(2007)의 개념모델을 투자자와 관련된 변수를 찾기 위한 분석의 틀로 참고하였다. 본 연구에서는 사회적경제 금융상품에 대한 투자행동에 영향을 미치는 요인으로 개인투자성향 요인, 사회환경적 요인, 사회적가치를 분석하였다. 본 연구는 향후 개인 투자자들을 대상으로 하는 사회적경제 관련 금융 상품을 개발할 때, 잠재적 개인 투자자를 실제 투자로 유인하기 위한 시사점 및 아이디어를 제공하는 것을 목적으로 한다. 연구 결과로 첫째, 개인투자성향 요인인 자기과신, 자기통제, 위험수용성향은 투자의도에 영향을 미치지 않는 것으로 분석되었다. 둘째, 사회환경적 요인인 사회적 상호작용과 준거집단 영향은 투자의도에 부분적으로 영향을 주는 것으로 분석되었다. 다양한 정보채널과 투자자의 상호작용이 많을수록, 주변사람에 더 의존적 투자 성향이 있을수록 사회적경제 기업 금융상품에 투자할 의도가 높다고 해석할 수 있다. 셋째, 사회적가치는 투자의도에 부분적으로 영향을 미치는 것으로 분석 되었다. 사회, 환경, 경제적인 가치를 포함한 공동체의 편익을 지향하는 투자자 일수록, 사회적경제 금융상품에 투자할 의도가 높다. 넷째, 사회적경제 금융상품에 투자의향이 있는 집단이 투자의향이 없는 집단보다 자기과신, 사회적 상호작용, 준거집단영향, 사회적가치가 높은 것으로 나타났다. This study is determined to define the characteristics of potential investors who would invest in social economy firms. Hershey’s (2007) conceptual model was used as a framework to analyze the variables related to investors. This study uses Hershey’s Model of Investor Behavior (2007) as the main analysis tool to find out related variables. This study analyzed how an individual’s propensity to invest, the peculiarities of social environment, and social values each affect investment behavior. This study is aimed at provide suggestions and ideas for defining and linking potential investors to social financial instruments, their related firms and financial instruments. According to this analysis, the following conclusions can be made: (1) Overconfidence, self-control, and risk tolerance do not affect investment intentions; (2) social interaction and reference groups partially influence investment intention. The more information channels and investors interact with each other, the more investors tend to depend on the people around them - leading to greater intention to invest in social financial instruments; (3) social value partially influences investment intention. Investors who are seeking to provide benefit to the community, society, environment and economy, are more likely to invest in social financial instruments; (4) the research reveals that the group with greater investment sentiments for social financial instruments show higher overconfidence, social interaction and reference group influence, and social value than the group without the same investment sentiments. However, there are limitations to this study. First, investors in Korea generally lack awareness, understanding, and education about social economy firms. Second, The study does not represent the investment intention of Korea as a whole. There may be some bias due to sampling error.

페어링 암호 연산을 위한 F<SUB>3m</SUB>에서의 효율적인 세제곱근 연산 방법

조영인(Young In Cho),장남수(Nam Su Chang),김창한(Chang Han Kim),박영호(Young-Ho Park),홍석희(Seokhie Hong) 한국정보보호학회 2011 정보보호학회논문지 Vol.21 No.2

F3m에서의 Tate 페어링 또는 ηT 페어링 알고리즘 계산을 위하여 효율적인 세제곱근 계산은 매우 중요하다. x<SUP>1/3</SUP>의 다항식 표현 중 0이 아닌 계수들의 개수를 x<SUP>1/3</SUP>의 헤밍웨이트라 할 때, 이 헤밍웨이트가 세제곱근 연산의 효율성을 결정하게 된다. O. Ahmadi 등은 f(x)=x<SUP>m</SUP>+ax<SUP>k</SUP>+b(a, b∈F₃)가 F₃[x]의 삼항 기약다항식이라 할 때, F3m=F₃[x]/(f)을 생성하는 모든 삼항 기약다항식에 대하여 x<SUP>1/3</SUP>의 헤밍웨이트를 계산하였다. 본 논문에서는 Shifted Polynomial Basis(SPB)가 기존의 결과보다 x<SUP>1/3</SUP>의 헤밍웨이트를 낮출 수 있음을 보이며, 모듈로 감산 연산이 필요없는 가장 적합한 SPB를 제공한다. Evaluation of cube roots in characteristic three finite fields is required for Tate (or modified Tate) pairing computation. The Hamming weights (the number of nonzero coefficients) in the polynomial representations of x<SUP>1/3</SUP> and x<SUP>2/3</SUP> determine the efficiency of cube roots computation, where F3m is represented as F₃[x]/(f) and f(x)=x<SUP>m</SUP>+ax<SUP>k</SUP>+b∈F₃[x](a, b∈F₃) is an irreducible trinomial. O. Ahmadi et al. determined the Hamming weights of x<SUP>1/3</SUP> and x<SUP>2/3</SUP>for all irreducible trinomials. In this paper, we present formulas for cube roots in F3m using the shifted polynomial basis(SPB). Moreover, we provide the suitable shifted polynomial basis bring no further modular reduction process.

아연의 1차혈관평활근세포 증식에 대한 기능

조영은(Young-Eun Cho),권인숙(In-Sook Kwun) 한국영양학회 2020 Journal of Nutrition and Health Vol.53 No.6

Purpose: The vascular smooth muscle cells (VSMCs) in mature animals have implicated to play a major role in the progression of cardiovascular diseases such as atherosclerosis. This study aimed at optimizing the protocol in culturing primary VSMCs (pVSMCs) from rat thoracic aorta and investigating the effect of cellular zinc (Zn) deficiency on cell proliferation of the isolated pVSMCs. Methods: The thoracic aorta from 7-month-old Sprague Dawley rats was isolated, minced and digested by the enzymatic process of collagenase I and elastase, and then inoculated with the culture Dulbecco Modified Eagle Medium (DMEM) at 37°C in an incubator. The primary cell culture morphology was observed using phase-contrast microscopy and cellular Zn was depleted using Chelex-100 resin (extracellular zinc depletion only) or 3 μM N,N,N′,N′-tetrakis(2-pyridinylmethyl)-1,2-ethanediamine (TPEN) (extracellular and intracellular zinc depletion). Western blot analysis was used for the detection of SM22α and calponin as smooth muscle cell marker proteins and von Willebrand factor as endothelial cell marker protein to detect the culture purity. Cell proliferation by Zn depletion (1 day) was measured by MTT assay. Results: A primary culture protocol for pVSMCs from rat thoracic aorta was developed and optimized. Isolated cultures exhibited hill and valley morphology as the major characteristics of pVSMCs and expressed the smooth muscle cell protein markers, SM22α and calponin, while the endothelial marker von Willebrand factor was hardly detected. Zn deprivation for 1 day culture decreased rat primary vascular smooth muscle cell proliferation and this pattern was more prominent under severe Zn depletion (3 μM TPEN), while less prominent under mild Zn depletion (Chelexing). Conclusion: Our results suggest that cellular Zn deprivation decreased pVSMC proliferation and this may be involved in phenotypic modulation of pVSMC in the aorta.