• Journal of Preventive Medicine and Public Health
• /
• v.28 no.1 s.49
• /
• pp.103-121
• /
• 1995

An investigation on psychophysiological health and social well-being of shift workers been carried out on workers of a automobile manufacturing plant in Ulsan, for 1 month from April, 1993. This cross-sectional survey compared shift workers(n=544) with day workers(n=115). Each subject completed a questionnaire about his personal habit, background, shift schedule, sleep and eating patterns, subjective digestive symptom and psychological well-being and distress using the General Well-Being Schedule(GWB) by self administrated questionnaire that was developed for the U.S. Health and Nutrition Examination Surveys (HANES I). Chi-square analysis was used for discontinuous data and the t-test was used for continous data to determine whether differences noted between the two groups. In terms of sleep quality, a greater percentage of shift workers frequently had trouble getting back to sleep once awakend(p<0.01), and a greater percentage of shift workers awakend tired or sleepy frequently more often than day workers(p<0.05). In rating the quality of their sleep, more shift workers rated their sleep fair to poor than day workers, and greater percentage of shift workers felt tired or sleepy at work two or more times per week(p<0.01) and a much higher percentage of shift workers felt tired or sleepy after work every days(p<0.01). In terms of sleep patterns, a much higher percentage of day workers reported uninterrupted sleep per 24hours than shift workers. The shift workers reported different eating patterns from day workers but there were no statistically significant and rate of their appetite. Thirteen percent of day workers reported the best appetite but only 6.6% of shift workers had the best appetite. The gastric complaints is more frequent in shift workers than day workers(p<0.01). Among subscores in General Well-Being Schedule, anxiety, depression, positive well-being and vitality subscale of shift workers were lower than those of day workers(p<0.05) and general health and self control subscale of shift workers were lower than .those of day workers but there were no statistical significant difference. Based on these study result, it could be concluded that the shift work has significant effects on some psychophysiological conditions of the workers.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2019.05a
• /
• pp.218-219
• /
• 2019

현재 IMO MSC, LEG 및 FAL 등에서는 자율운항선박의 도입을 위해 IMO 국제협약에 대한 규정검토작업(RSE)이 시행되고 있다. 본 연구에서는 대한민국이 참여하고 있는 자율운항선박 규정 검토 작업에서 STCW 1978, as amended, SOLAS 제9장 ISM code 및 자율운항선박 임시운항지침 개발에 대한 여러 논의 사항을 소개하고, 이에 대한 대한민국의 대응 사항을 분석하여 지속적인 대응 방안에 대한 안을 제시한다. STCW 1978, as amended는 미국이 주도하고 한국 및 러시아 등이 지원하여 작업을 수행하고 있으며, SOLAS 제9장은 노르웨이 주도로 대한민국이 지원하고 있다. 더불어 MASS 임시운항 지침은 노르웨이가 주도하여 비공식 작업반을 통해 개발하고 있으며, 대한민국은 MSC 101차 회의에 동 문서를 공동으로 제출하였다. 이러한 연구 및 역할을 바탕으로 대한민국의 관련 산업 생태계를 고려하여 추후 다양하게 논의될 MASS관련 기술, 정책, 교육 및 R & D에 적극적이고 선제적 대응이 가능할 것이다.

• Journal of Korean Society of Transportation
• /
• v.35 no.6
• /
• pp.545-556
• /
• 2017

Various assessment indexes have been developed and utilized to evaluate the driver workload. However, existing workload assessment indexes do not fully reflect driving habits and driving patterns of individual drivers. In addition, there exists significant differences in the amount of workload experienced by a driver and the ability to overcome the driver's workload. To overcome these limitations associated with existing indexes, this study has developed a novel workload assessment index to reflect an individual driver's driving pattern. An average of the absolute values of the steering velocity for each driver are set as a threshold value in order to reflect the driving patterns of individual drivers. Further, the sum of the areas of the steering velocities exceeding the threshold value, which is defined as erratic steering area (ESA) in this study, was quantified. The developed ESA index is applied in evaluating the driver workload of manually driven vehicles in automated vehicle platooning environments. Driving simulation experiments are conducted to collect drivers' responsive behavior data which are used for exploring the relationship between the NASA-TLX score and the ESA by the correlation analysis. As a result, ESA is found to have the greatest correlation with the NASA-TLX score among the various driver workload evaluation indexes in the lane change scenario, confirming the usefulness of ESA.

• Proceedings of the Korean Society for Agricultural Machinery Conference
• /
• 2017.04a
• /
• pp.16-16
• /
• 2017

국내 농업인구 감소 대비 식품소비량이 증가함에 따라 농가의 인력을 대체하고 다양한 작업이 가능하며 가격이 저렴한 국내 기계화 기술이 필요하다. 무동력 디스크해로우 작업기는 경운과 배토가 가능한 복합작업기로서 작업기를 구성하는 주요 구성품들은 필드작업에 의해 발생되는 하중에 구조적 강도와 신뢰성이 충분히 확보되어야 한다. 또한, 실제로 필드 작업 시 작업기에 걸리는 하중은 복합하중 형태로 전달되기 때문에 단순한 형태 하중에 비해 하중계측에 어려운 점이 있으므로 하중계측점의 선정이 매우 중요하다. 본 논문에서는 하중계측점을 선정하기 위하여 복합기의 주요 구성품인 치즐(chisel) 및 디스크해로우암(disk harrow arm)에 대하여 구조해석을 수행하였으며, 3축 방향의 단위하중 응력 계산결과로부터 load reconstruction을 위한 스트레인 게이지 위치를 선정하였다. 또한, 스트레인 게이지의 신호가 하중해석에 적절한 값이 되도록 기존의 형상을 수정하였다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2010.06b
• /
• pp.294-298
• /
• 2010

슈퍼컴퓨터는 스케줄러를 이용하여 사용자의 작업(task) 실행 및 자원할당 요청을 관리하고, 사용자는 배치 프로세스 형태로 스케줄러에 작업을 제출한다. 스케줄러에 배치 프로세스 형태로 작업을 제출하는 방식은 사용자의 작업이 비동기적으로 수행되어 작업의 상태가 변경될 경우 확인할 수 있는 서비스를 필요로 한다. 이를 위해 대부분의 슈퍼컴퓨터는 작업이 완료되거나 오류가 발생하여 중단되었을 때 전자메일을 발송하여 사용자에게 정보를 제공하는 이벤트 알림 서비스를 제공하지만, 장기간 수행되는 작업의 경우 주기적으로 전자메일을 확인해야 하는 불편함이 있고, 다수의 작업을 동시에 수행하는 경우 각각의 이벤트 정보를 포함한 전자메일을 관리하는데 어려움이 따른다. 본 논문에서는 슈퍼컴퓨터에서 제공하는 전자메일 기반 이벤트 알림 서비스를 이용하여 이벤트를 통지받을 때 지정된 방식으로 후처리 작업이 실행될 수 있는 자동화된 후처리 시스템의 설계 및 구현 방법을 제시한다.

• The KIPS Transactions:PartB
• /
• v.8B no.3
• /
• pp.283-287
• /
• 2001

컴퓨터를 이용한 협동작업은 공간적으로 분산되어 있는 여러 작업자들이 동기적 EH는 비동기적으로 협력할 수 있게 함으로써 보다 신속하고 정확하게 작업을 진행할 수 있게 한다. 최근의 협동작업 분야의 급속한 발전은 이제 더 이상 웹 상에서의 협동작업 도구를 메일, 채팅, 화이트보드, 화상회의 등에 한정하지 않고 웹 응용 프로그램들을 협동작업 도구에 포함시키기에 이르렀다. 본 논문에서는 공간적으로 분산되어 있는 여러 작업자들이 상용 웹 브라우저를 이용하여 웹 문서와 웹 데이터베이스 내용을 공유함으로써 보다 효율적인 협동작업을 할 수 있는 시스템을 소개한다. 본 논문에서 소개하는 시스템은 주소 동기화(URL Synchronization), 스크롤 동기화(Scroll Synchronization) 및 윈도우 크기 동기화(Window Size Synchronization) 기능을 제공하여 사용자들이 서로 다른 터미널에서 웹 브라우저를 동기적으로 이용할 수 있게 한다. 주소 동기화는 인터넷 브라우징의 이동과 방향을 동기적으로 제어해주고, 폼 동기화는 웹 페이지 입력을 실시간으로 보여준다. 스크롤 동기화는 웹 페이지의 스크롤을 동기적으로 제어하여 웹 브라우저의 출력 내용이 길어질 경우에도 문서 안의 같은 부분을 공유 할 수 있게 하며 윈도우 크기 동기화는 윈도우의 길이와 넓이를 맞춰준다.

• Science of Emotion and Sensibility
• /
• v.15 no.2
• /
• pp.249-258
• /
• 2012

The aim of this study was to investigate the effects of aesthetics of smartphones on subjective and objective usability by the task factors. Although several studies have focused on the effects of aesthetics on subjective and objective usability, correlation between aesthetics and objective usability is ambiguous. Using smartphones which have same functions but different aesthetics, thirty-six subjects were asked to complete one of 3 types of tasks (inputting information, searching information, enjoying information). Both performance data and subjective measures were recorded. The results showed that high aesthetics had a more positive effect on subjective usability than low aesthetics before and after use, with smaller difference after use. High aesthetics seemed to yield longer task completion times. But objective usability was not significantly affected by both task factors and aesthetics. The results indicated that aesthetics may have multiple effects that go beyond affective satisfaction. The findings of this study could be applied to predict effects of aesthetics on subjective and objective usability in usability testing.

• Journal of Agricultural Extension & Community Development
• /
• v.19 no.4
• /
• pp.1021-1039
• /
• 2012

Based on the ergonomic evaluation of workers in the domestic traditional Korean sweet manufacturer, one of the small scale agricultural product manufacturers, the purpose of this study is on estimating the specific works and muscles that have possibility of musculoskeletal disorder through an EMG experiment for quantitative evaluation. The method followed in an order: works that have musculoskeletal disorder risk were extracted through ergonomic assessment tools, RULA and REBA, and then EMG experiment on the postures was carried out with six healthy adult male patients. As an ergonomic evaluation result, work posture during the drying process had the greatest musculoskeletal disorder risk, and EMG activity in the cleansing work posture scored the highest among the drying, cleansing, and coating work postures. In particular in the drying work, relatively high EMG activities were shown in the two muscles in the lower body: biceps femoris muscle, and gastrocnemius, than any other muscles. Therefore, during the traditional Korean sweet workplace design in future, the workplace requires a posture that deeply bow wrist for a long time should be avoided.

• Korean Journal of Construction Engineering and Management
• /
• v.8 no.5
• /
• pp.142-151
• /
• 2007

The rock excavation work on the sea is planned as underwater process if the elevation of the rock is lower than the M.S.L.(Mean Sea Level). However, in case of West and South sea which are largely different between the rise and fall of the tide, the earth work can be performed on the ground while the work surface is exposed above the sea according to the tide cycle. Thus, it may a good substitute to make up for shortcomings of underwater construction works such as safety problems of workers, loss of efficiency and increasement of construction costs. But the difference between the height of the rock excavation surface and the water surface changed by the tide makes the exposure time of work surface, that is the possible working hours be changed. Also, it may cause the changes of construction cost. Thus, this study analyzes the economical efficiency of the construction method using the difference between the rise and fall of the tide in comparison with the construction method which is performed under the sea, and it also suggests the way to analyze the economical working hours by estimating the possible working hours on the ground. We also try to find out the application possibility of the way like the rock excavation work on the sea using the difference between rise and fall of the tide.

• Journal of Korea Entertainment Industry Association
• /
• v.15 no.4
• /
• pp.299-307
• /
• 2021

This study is a research study to identify the recognition, experiences, needs of convergence education in occupational therapy students. Therefore, it is intended to provide basic data when developing convergence subjects and non-regular programs within the occupational therapy (department) curriculum. From December 03, 2020, a web questionnaire consisting of 14 questions in 4 areas was distributed over a month, and the data of 130 people were finally analyzed. The results are as follows. First, the recognition and experiences of occupational therapy students in convergence education were low. Second, 57.7% of students recognized that occupational therapy majors need convergence education, and the expected effect of convergence education was 'improvement of occupational therapy job-related knowledge'. Third, it was recognized that 'natural science', 'prosthesis and assistive technology, activity of daily living(ADL)', and 'ADL training' convergence education was necessary for the students of occupational therapy department. The results of this study are expected to be used as basic data in the future development of occupational therapy curriculum and non-regular programs for convergence education. In the future, I think that the demand for convergence education and program development in preparation for the 4th industrial revolution will increase in the occupational therapy curriculum. It is expected that the data of this study will be used meaningfully by professors in charge of occupational therapy education at universities.