• 한국화예디자인학연구
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• 제41호
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• pp.133-153
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• 2019

본 연구는 녹지공간의 확보가 제한적으로밖에 이루어질 수 없는 도시 환경 안에 시민들이 식물과의 접촉기회를 가질 수 있게 하는 새로운 공공설치물의 연구개발 및 창작에 관한 연구이다. 그를 통해 협소하고 붐비는 중앙버스전용차로 정류장에서 시민들에게 잠시나마 식물을 경험하는 즐거움을 제공하는 화예작품의 창작을 기획하였다. 이를 위해 연관된 해외의 다양한 적용 사례에 대한 사례 조사와 현재 서울시에서 운영 중인 기존 중앙차로 버스정류장의 분석을 행하였고, 그런 맥락 안에서 적용 가능한 설치 형태 및 요소를 발굴하는 창작 예비 조사를 행하였으며 이를 바탕으로 설치물의 프로토타입을 개발하는 창작 실행을 행하였다. 그 결과 기존 중앙차로 버스정류장의 벽면을 대체할 수 있는 세로형의 긴 벽면형 프레임 안에 심플한 수직적 구조를 이루면서 선반 구조를 통해 식물의 접촉경험을 최대한 느낄 수 있도록 한 거치식 스크린 형태의 화예 설치 작품 1점과 책상 위에 설치 가능한 실내용 소품 2점을 개발할 수 있었다. 본 연구는 과밀화된 도시 환경에서 많은 시민들에게 노출되는 공공장소에 효과적으로 제시되는 식물 설치물을 제공함으로써 녹시율을 높이고 식물의 직접 접촉을 통한 심리적, 정서적 효과를 유발할 수 있는 화예창작물을 개발하였다는 점에서 그 의의를 찾을 수 있겠다.

• Journal of Biosystems Engineering
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• 제37권4호
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• pp.225-232
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• 2012

Purpose: Accurate monitoring of information from various agricultural vehicles is one of the most important factors for appropriate management strategy of field operations. While there has been a number of study and design on applications of sensors and actuators for data acquisition and control system in tractor, incompatibility between various customized hardware and software has become a major obstacle to the universal deployment in real field operation. International standard for implementation of electronic control unit (ECU) in agricultural vehicles has becoming a mandatory requirement for inter-operation compatibility in the international trade of agricultural vehicle industries. The ISO 11783 standard is basically based upon well known communication technology designated using the controller area network (CAN) bus. While CAN bus could provide 1.0 Mbps of communication speed, the standard only recommended 250 kbps. Methods: This study presents the implementation and evaluation of ISO 11783 for tractor electronic control units (TECU)with a higher transmission rate from multiple ECU than 250 kbps. Throughput and loss rate of the developed prototype were calculated across manipulated bus load for laboratory experimental tests, and the maximum requirement of transmission rate by ISO 11873 was satisfied with lower than 60% of bus load. Results: Field tests with a TECU implemented to process messages from global positioning system (GPS) receiver resulted that the root mean square error of position information was lower than 4 m with 0.5 m/s as a travelling speed. Conclusions: Results of this study represent the utilization of the international standard ISO 11783 to providepractical developments in terms with the inter-operability of TECU.

• Journal of Trauma and Injury
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• 제24권2호
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• pp.129-135
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• 2011

Purpose: During August 2010, a natural gas fuel cylinder on a bus exploded in downtown Seoul, injuring 20 citizens. This kind of blast injury has never been reported in Korea before. Thus, the goal of this study was to review the clinical features of these victims to help physicians manage similar cases and to understand the risk factors associated with blast injuries in everyday life. Methods: Twenty (20) victims who visited nearby emergency departments, and 3 peoples left hospital without care. Seventeen (17) victims were included in this study, and the following factors were investigated: age, sex, type of hospital, diagnosis of injury, injury mechanism, position of victim (in-bus/out of bus), classification of injury severity with START (simple triage and rapid treatment), and classification of injury according to the mechanism of the blast injury. Results: The victims included 8 males (47%), 9 females (53%). The mean age was $37.5{\pm}12$. Thirteen (13) victims were transferred to two tertiary hospitals, and 4 were transferred to two secondary hospitals. The types of injury were 3 fractures, 2 ligaments injuries, 6 contusions, 4 abrasions, and 3 open wounds (one of them was combined fracture). According to START classification, 17 victims were 1 immediate, 11 minor, 5 delayed, and no death. Classifications according to the mechanism of the blast injury were 1 primary injury, 6 secondary injuries (2 of them combined other mechanism), 3 tertiary injuries and 9 quaternary injuries. Conclusion: Trauma care physicians should be familiar with not only the specific types of injuries from blast accidents, but also the potential accidents that may occur in public facilities.

• 전기학회논문지
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• 제62권7호
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• pp.943-949
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• 2013

Recently, an electric vehicle (EV) has been become a huge issue in the automotive industry. The EV has many electrical units: electric motors, batteries, converters, etc. The DC distribution power system (DPS) is essential for the EV. The DC DPS offers many advantages. However, multiple loads in the DC DPS may affect the severe instability on the DC bus voltage. Therefore, a voltage bus conditioner (VBC) may use the DC DPS. The VBC is used to mitigate the voltage transient on the bus. Thus, a suitable control technique should be selected for the VBC. In this research, Current controller with fixed switching frequency is designed and applied for the VBC. The DC DPS consist of both a resistor load and a boost converter load. The load variations cause the instability of the DC DPS. This instability is mitigated by the VBC. The simulation results by Matlab simulink and experimental results are presented for validating the proposed VBC and designed control technique.

• 성인간호학회지
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• 제23권4호
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• pp.321-331
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• 2011

Purpose: This study was designed to identify the incidence risk of cardicerebrovascular disease (CVD) among male bus drivers, and to examine and compare the predictors of their health behavior according to the level of CVD incidence risk. Methods: The convenience sample of 222 male bus drivers were recruited from a bus company located in Jeonnam province. Data were collected from self-reported questionnaires and annual medical examination records from 2010. The CVD incidence risk was calculated based on the risk criteria for industrial workers. Results: The 26.6% and 26.1% of the participants were in the moderate and high risk group, respectively. The 72% of the participants were in the precontemplation stage and reported no intention to change their unhealthy lifestyles. Stepwise multiple regression analyses showed that current smoking, excessive alcohol drinking, physical inactivity and lack of knowledge were negative predictors of good health behavior in the normal/low risk group (Adj $R^2$=.443). Heavy alcohol drinking, current smoking, physical inactivity and dyslipidemia were reported by the moderate/high risk group (Adj $R^2$=.427). Conclusion: This study suggested that targeted education and counseling are needed to modify unhealthy lifestyles such as alcohol consumption, smoking and exercise among middle aged male drivers. Especially, dyslipidemia should be managed among those who are at risk for CVD.

• Safety and Health at Work
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• 제2권2호
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• pp.169-175
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• 2011

Objectives: The questionnaire of occupational stress index (OSI) has been popular in the workplace, and it has been tailored for bus drivers in Taiwan. Nevertheless, its outcomes for participants are based on self-evaluations, thus validation by their physiological stress biomarker is warranted and this is the main goal of this study. Methods: A cross-sectional study of sixty-three city bus drivers and fifty-four supporting staffs for comparison was conducted. Questionnaire surveys, 24-hour urine cortisol testing, and blood draws for dehydroepiandrosterone-sulfate (DHEA-S) testing were performed. The measured concentrations of these biological measures were logarithmically transformed before the statistical analysis where various scores of stressor factors, moderators, and stress effects of each OSI domain were analyzed by applying multiple linear regression models. Results: For drivers, the elevated 24-hour urine cortisol level was associated with a worker's relationship with their supervisor and any life change events in the most recent 3 months. The DHEA-S level was higher in drivers of younger age as well as drivers with more concerns relating to their salary and bonuses. Non-drivers showed no association between any stressor or satisfaction and urine cortisol and blood DHEA-S levels. Conclusion: Measurements of biomarkers may offer additional stress evaluations with OSI questionnaires for bus drivers. Increased DHEA-S and cortisol levels may result from stressors like income security. Prevention efforts towards occupational stress and life events and health promotional efforts for aged driver were important anti-stress remedies.

• 디지털융복합연구
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• 제17권6호
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• pp.19-25
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• 2019

최근 들어 소비자 관점에서 차량을 공유하는 카셰어링(car sharing) 관련 연구가 다양하게 진행되었다. 한편 일본의 국토교통성(國土交通省)은 공유경제 관점에서 새로운 거래유형으로 카셰어링 서비스와 고속버스와 연계한 사업형태 및 급격히 증가하는 카셰어링을 더 효과적으로 활용하기 위해 공유 자동차 설치의 사회실험과 정책들을 실증적으로 실시하였다. 따라서 본 연구는 일본의 고속버스와 연계한 사례를 살펴본 후 실제적 차원에서 그 내용을 분석하고 논의하였다. 이는 일본의 고속버스와 연계된 이용 등으로 카셰어링 활성화 방안 사례를 통해 국내의 카셰어링의 연계된 서비스를 확산시키는 데 있어서 실무적 시사점을 제안했다는 점에서 의의가 있다고 할 수 있다. 또한 229명의 카셰어링 이용자에게 수집한 자료를 실증적으로 검증하였다. 다중회귀분석 결과, 경제적 가치와 시간적 가치 및 심리적 가치의 순서로 이용의도에 영향을 미치는 것으로 나타났다. 이러한 연구결과는 고속버스와 연계된 카셰어링 이용의도를 높이기 위해서 이용자의 지각된 가치에 대한 이해가 요구되며, 카셰어링 이용자의 만족도를 향상시키기 위한 관리적 활용 방안이 필요함을 시사한다.

• Safety and Health at Work
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• 제9권4호
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• pp.454-461
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• 2018

Background: Working conditions and psychosocial work factors have acquired an important role explaining the well-being and performance of professional drivers, including those working in the field of public transport. This study aimed to examine the association between job strain and the operational performance of public transport drivers and to compare the expositions with psychosocial risk at work of three different types of transport workers: taxi drivers, city bus drivers, and interurban bus drivers. Method: A sample of 780 professional drivers was drawn from three transport companies in Bogota (Colombia). The participants answered the Job Content Questionnaire and a set of sociodemographic and driving performance questions, including age, professional driving experience, work schedules, and accidents and penalties suffered in the last 2 years. Results: Analyses showed significant associations between measures of socio-labor variables and key performance indicators such road traffic accidents and penalties. Furthermore, multiple linear regression analysis contributed to explain significantly suffered accidents from key variables of the Job Demand-Control model, essentially from job strain. In addition, throughout post-hoc analyses, significant differences were found in terms of perceived social support, job strain, and job insecurity. Conclusion: Work stress is an issue that compromises the safety of professional drivers. This research provides evidence supporting a significant effect of job strain on the professional driver's performance. Moreover, the statistically significant differences between taxi drivers, city bus drivers, and interurban bus drivers in their expositions to work-related stress suggest the need for tailored occupational safety interventions on each occupational group.

• 전기학회논문지
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• 제57권10호
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• pp.1726-1730
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• 2008

In this paper, the application schemes for coordinated control system of multiple FACTS were presented to enhance the voltage stability around the metropolitan areas. In order to coordinated control of FACTS devices, f-V analysis method which is one of the indices for voltage stability was performed with real time network data which is transferred from SCADA/EMS system. If the system is unstable after contingencies, the new operation set-point of FACTS would be determined using bus sensitivity from tangent vector at voltage instability point. Otherwise, we would determine the new operation set-point of FACTS for considering economical operation, like as active power loss minimization using Optimal Power Flow algorithm. In simulation, the SCADA/EMS 2007's data are used for studying the coordinated control algorithm of multiple FACTS devices that is installed or will be installed in KOREA power system

• 대한지역사회작업치료학회지
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• 제7권3호
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• pp.35-42
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• 2017

목적 : 본 연구는 일부지역 버스운전기사의 일반적 특성과 수면의 질 그리고 작업 능력 간의 상관성을 파악하고, 작업능력에 미치는 영향을 확인하고자 하였다. 연구방법 : 버스운전기사 120명을 대상으로 작업 능력의 측정을 위해 작업 능력 지수(Work Ability Index : WAI)를 사용하였고, 수면의 질은 수면의 질 평가(Pittsburgh Sleep Quality Index : PSQI)를 통해 평가하였다. 작업능력과 수면의 질과의 상관관계를 확인하기 위하여 피어슨 상관분석(Pearson's correlation coefficient)를 이용하였고, 수면의 질이 작업능력에 미치는 영향을 확인하기 위해 단계적 다중 회귀분석(Stepwise regression analysis)을 통해 분석하였다. 결과 : 작업능력에 영향을 미치는 변인들의 상관관계를 분석 한 결과 수면의 질(p<.001)과 근로시간(p<.001) 에서 부적인 상관관계가 나타났다. 최종적으로 수면의 질(p<.001)과 근로시간(p<.01)이 버스운전기사들의 작업능력에 통계적으로 유의한 영향을 미치는 변인으로 분석되었고, 수정된 결정계수 값($R^2$)이 0.482로 48.2%의 설명력을 보였다. 결론 : 버스운전기사들의 수면의 질과 근로시간이 작업능력에 영향을 미치는 주요 변인으로 파악되었다. 그러므로 버스운전기사의 작업능력을 향상시키기 위한 방안으로 수면의 질과 근로시간을 고려하여야 하겠다.