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( Hyunshik Kim ),( Jiameng Ma ),( Maehashi Akira ) 한국스포츠정책과학원(구 한국스포츠개발원) 2017 International Journal of Applied Sports Sciences Vol.29 No.1
By reviewing current research, this study aimed to identify the features of effective intervention using a socio-ecological model to improve physical activity (PA) and reduce sedentary behavior (SB) in young children. The databases used for the study were PubMed and Medline, and the effectiveness of the study was assessed based on the levels of PA and SB determinants in the socio-ecological model (i.e., individual, family, social, and environmental factors). Among the studies conducted on children aged six or younger, and published within the last decade, 67 met our criteria. Some individual (gender, body mass index [BMI], age), family and home (parental role modeling, parents` BMI, parents` education), social (socioeconomic status), and built environment (rural/urban, weekday/weekend) variables were found to have an impact on both PA and SB. Results call for further research in non-Western countries as well as for improvement of PA and reduction of SB in young children. Furthermore, additional studies are needed to examine effective, socio-ecological model-based interventions for PA and SB in young children.
Jiameng Ma(Jiameng Ma),Dongmei Ma(Dongmei Ma),Qiang Wang(Qiang Wang),Hyunshik Kim(Hyunshik Kim) 사피엔시아 2020 Exercise Medicine Vol.4 No.-
Objectives: The workplace environment has an influence on the physical well-being of workers and their productivity. This study examined how sedentary time and work efficiency changed before and after an intervention to improve the ergonomics of a workplace environment. Methods: This study was designed as a natural pre-post study. Workers were evaluated 101 (77% men, mean [SD] age=44.6[9.8] years) after the intervention. The intervention included the addition of sit-stand desks, fitness rooms, and rest areas at the workplace. The effect of the intervention was assessed after a period of three months. Sedentary behavior and physical activities were evaluated using triaxial accelerometers, body fat percentage and fat-free mass were calculated from body composition, and work engagement and work performance were evaluated through questionnaires. T-tests were used to compare the differences. Results: The percentage of time spent sitting decreased post-intervention (-1.7, 95% CI: -0.4, -3.1). Work performance compared to either three months pre-survey increased significantly post-intervention (Most workers assessment: 0.4, 95% CI: 0.8, 0.3; Self-rated performance the past year or two: 0.4, 95% CI: 0.6, 0.4; Self-rated performance the past 4 weeks: 0.3, 95% CI: 0.6, 0.3). Work engagement improved significantly in terms of vigor at work (0.8, 95% CI: 1.1, 0.5), dedication to work (0.8, 95% CI: 1.1, 0.7), and absorption in work (0.7, 95% CI: 1.1, 0.5). Conclusions: Improving a workplace environment using existing facilities decreased sedentary time and enhanced work efficiency—these findings are useful for workplace health promotion and public health policies.
Jiameng Ma(Jiameng Ma),Dongmei Ma(Dongmei Ma),Qiang Wang(Qiang Wang),Hyunshik Kim(Hyunshik Kim) 사피엔시아 2019 Exercise Medicine Vol.3 No.-
Objectives: In order to reduce the sedentary behavior of workers who remain seated for extended periods of time, the correlation between sedentary behavior by time period and health indicators must be investigated. Thus, the purpose of this study is to investigate the correlation between the sedentary behavior during work hours or per day and the amount of physical activity and health indicator. Methods: Based on an objective measurement method using an accelerometer and Inbody, the correlation among sedentary behavior, amount of physical activity, body fat percentage, muscle mass, and demographic variables in the survey of 101 Japanese workers was analyzed. For the amount of physical activity, a triaxial accelerometer was used to measure light-intensity lifestyle activity [1.6–2.9 metabolic equivalents (METs)], sedentary time (≤1.5 METs), and vigorous physical activity (3 METs or above), which was evaluated every 10 seconds. Results: The results reveal that the sedentary behavior by time period is related to gender, age, type of occupation, low-intensity physical activity, and walking time, in which low-intensity physical activity has a greater effect on the sedentary behavior than moderate-intensity or higher physical activity. Specifically, for the sedentary time during work hours, the subjects who perform more low-intensity physical activity had a shorter sedentary time than those who do not (OR = 0.41, 95 % CI = 0.17-0.97), and those who have longer walking times per day had a shorter sedentary time than those who do not (OR = 0.21,95 % CI = 0.62-0.72). Conclusions: In order to reduce the SB of workers in the future, research on developing a strategic intervention method based on the results of this study should be conducted.
김재원(Jaewon Kim),신현식(Hyunshik Shin) 한국정보과학회 1988 한국정보과학회 학술발표논문집 Vol.15 No.2
본 논문에서는 리스프 전용 기계(LISP MACHINE)에서의 리스트 처리가 실시간 방식 또는 대화식 방식을 지원할 수 있는 폐기 기억 환수 알고리즘을 제시한다. 이 알고리즘은 리스프 기계내에 리스트 처리 전용 프로세서와 폐기 기억 환수 전용 프로세서가 세마포를 통하여 공유 기억 장치를 액세스하면서 각각의 작업을 동시에 처리하도록 한다. 소규모의 기억 장치로 높은 효율을 얻을 수 있으며 특히 리스트 처리가 중단될 필요가 없으므로 프로그램의 생산성이 향상될 수 있다. 본 알고리즘은 Concurrent PASCAL에 의해 시뮬레이트되었다.
프랜차이즈 본부와 가맹점 간의 결속이 가맹점의 매출에 미치는 영향
오세조,김상덕,조현식,강보현 연세대학교 경영연구소 2003 연세경영연구 Vol.40 No.1
프랜차이즈 시스템에 관한 지금까지의 연구들은 관계결속과 그 상호관계에 초점을 맞춘 대신 그 결과로서의 대출에 대해서는 연구가 미흡하였다. 본 연구는 대표적인 국내 외식 프렌차이즈의 300개 가맹점을 대상으로 관계결속이 재무적 성과인 매출에 어떠한 영향을 미치는지를 살펴보고, 가맹점들이 실질적으로 영업활동에 영향을 받을 수 있는 커뮤니케이션, 갈등, 그리고 본사의 가맹점에 대한 지원 등의 변수들이 관계결속에 어떤 영향을 미치는지를 실증적으로 검증함으로써 프랜차이즈 본부와 가맹점 간의 효율적인 Win-win관계를 구축하기 위한 이론적이며 관리적인 시사점을 제시하였다. 연구모형에서 제시된 대부분의 가설이 채택되었다. 다만, 가설과는 달리 커뮤니케이션은 관계결속에 직접적인 영향을 주지 않는 것으로 밝혀졌다.
컴포넌트기반 체계모의환경(AddSIM)에서 실행하기 위한 DEVS 모델 변환 방법
김도형(Dohyung Kim),오현식(Hyunshik Oh),박주혜(Juhye Park),박삼준(Samjoon Park) 한국정보과학회 2015 정보과학회 컴퓨팅의 실제 논문지 Vol.21 No.7
컴포넌트기반 체계모의환경(AddSIM)은 고해상도 공학급 무기체계를 사용하여 체계의 성능 및 효과도를 예측?분석하기 위해 개발된 무기체계 통합 모의환경이다. AddSIM을 이용한 고해상도 교전 모의분석을 위해서는 연속시스템으로 표현되는 무기체계 공학급 모델은 물론, 지휘?통제, 네트워크 제어 모델과 같이 DEVS 형식론으로 기술된 이산사건시스템 모델을 복합적으로 사용해야 한다. 본 논문에서는 DEVS 모델과 AddSIM 플레이어 모델의 함수 간 관계 매핑(mapping)을 통해 AddSIM에서 실행 가능한 DEVS 모델 변환방법을 제시한다. 제안한 방법은 우선, 계층적으로 구성된 DEVS 모델을 단일 계층으로 변환하고, DEVS의 네 가지 함수(외부천이, 내부천이, 출력, 시간진행함수)를 AddSIM 플레이어 함수로의 변환을 주요 내용으로 한다. An AddSIM(Adaptive distributed and parallel Simulation environment for Interoperable and reusable Models) is an integrated engagement simulation environment with high-resolution weapon system models for estimation and analysis of their performance and effectiveness. AddSIM can simultaneously handle the continuous dynamical system models based on continuous time, and command, control(C2) and network system models based on a discrete event. To accommodate legacies based on DEVS(Discrete Event System Specification) modeling, DEVS legacies must first be converted into AddSIM models. This paper describes how to implement DEVS models on AddSIM. In this study a method of mapping from hierarchical DEVS models to AddSIM players was developed: The hierarchical DEVS model should be flattened into a one layered model and four DEVS functions of the model, external transition, internal transition, output and time advance, should be mapped into functions of the AddSIM player.