• 한국산학기술학회논문지
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• 제14권4호
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• pp.1781-1791
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• 2013

본 연구는 근무특성이 다른 병동과 수술실에 근무하고 있는 간호사들의 인구사회학적 특성, 건강관련행위 특성, 직업적 특성, 직무스트레스 요인 및 사회심리적 요인에 따른 스트레스와 피로수준을 비교 분석하고자 시도하였다. 연구대상은 대전광역시에 소재하고 있는 4개 대학병원의 병동근무 간호사 220명, 수술실근무 간호사 147명, 합계 367명으로 하였으며, 2012년 7월 1일부터 8월 31일까지의 기간 동안에 구조화된 무기명 자기기입식 설문조사를 실시하였다. 연구결과, 사회심리적 스트레스에 관련된 요인으로 병동근무 간호사에서는 연령, 주관적인 건강상태, 근무경력, 업무에 대한 만족도, 업무에 대한 적성, 업무요구도, 업무자율성, 동료의 지지도, 자기존중감, 통제신념 및 A형 행동유형이 지적되었고, 수술실근무 간호사에서는 연령, 수면시간, 주관적인 건강상태, 근무경력, 업무의 신체적 부담정도, 업무에 대한 만족도, 업무에 대한 적성, 직업전환의사, 업무요구도, 업무자율성, A형 행동유형이 지적되었다. 피로수준에 관련된 요인으로 병동근무 간호사에서는 연령, 여가시간 여부, 주관적인 건강상태, 업무에 대한 만족도, 직업전환의사, 업무요구도, 통제신념, A형 행동유형이 지적되었고, 수술실근무 간호사에서는 연령, 주관적인 건강상태, 업무의 신체적 부담정도, 상사의 지지도, 동료의 지지도, 통제신념이 지적되었다. 이와 같은 결과를 볼 때 간호사의 근무부서에 따른 스트레스와 피로수준에 관련된 요인에 차이가 있음을 알 수 있으며 근무부서별 스트레스와 피로수준을 적절하게 통제할 수 있는 프로그램개발 및 실행이 필요하다고 생각된다.

• 한국산학기술학회논문지
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• 제16권7호
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• pp.4349-4356
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• 2015

본 연구는 현재 우리나라 컨테이너터미널에 적용가능한 친환경 운영기술 요인들을 도출하고, 관련 실무자들을 대상으로 한 실증분석을 통하여 친환경 컨테이너터미널 운영기술들에 대한 항목별 중요도와 만족도의 차이를 Importance-Performance Analysis로 검증함으로써 친환경 컨테이너터미널 운영기술에 대한 향후 방안을 제시하고자 하였다. 본 연구의 결과로 친환경 컨테이너터미널 운영기술 평가항목들 중 '빈이동 최소화'가 가장 중요한 요소로, '전기식 TC'가 가장 만족한 항목으로 분석되었다. 20개의 친환경 컨테이너터미널 운영기술 항목들은 '터미널 안벽시스템', '터미널 야드시스템', '터미널 접안지원 시스템'의 3개 요인으로 도출되었다. 이러한 결과들은 향후 우리나라 친환경 컨테이너터미널에 관련한 운영 정책수립 및 관리지침에 기여할 것으로 기대된다.

• Communications for Statistical Applications and Methods
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• 제6권3호
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• pp.687-694
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• 1999

The goodness of fit statistics of normality plots are obtained using the Receiver Operating Characteristic(ROC) method. This work is intended to compare with Shapiro-Wilk W statistic. Wel will use and discuss an accuracy of the test and the best cut-off value which minimizes the sum of the type I and II error probabilities.

• 산업진흥연구
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• 제8권4호
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• pp.37-46
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• 2023

화학설비의 노후화·고도화·복합화 등으로 인해 설비의 점검, 보수 또는 정비 작업 등의 비일상 작업이 증가하고 있으며, PSM 대상 화학제품제조업 사업장에서의 지난 10년간 발생한 1,483건의 사고 중 비일상 작업 중에 발생한 사고가 전체의 56%(932건)를 차지하여 일상 작업보다는 비일상 작업 중에 더 많은 사고가 발생하는 것을 확인할 수 있다. 특히 공장 운전의 경제성 및 효율성을 위하여 공장 전체를 정지시키지 않고 일부 설비를 정지시킨 후 운전 중인 설비와는 격리한 상태로 점검, 보수 또는 정비 작업을 수행하는 경우가 있다. 따라서 첫째, 화학공장의 취급물질, 운전조건, 설비의 위험도 등을 기준으로 격리 표준(Baseline Isolation Standard)을 수립하여 안전한 격리 방안을 선정하여야 한다. 둘째, 현재 국내 법규 및 기준 상에는 구체적인 격리 표준의 필요성을 제시하지 않고 있으므로 격리 표준의 마련을 제도화하는 것이 필요하다. 이러한 기술적·제도적 개선을 통하여 화학공장 설비에서의 화학물질의 누출에 의한 화재·폭발·중독 사고를 예 방하여야 한다.

• 대한영양사협회학술지
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• 제23권2호
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• pp.180-191
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• 2017

The purpose of this study was to identity the probability of cross-contamination from the environment. For this, we examined foodservices at 20 universities/colleges for microbiological analysis of their working facilities and environment as well as their preventive equipment against cross-contamination. Seventy percent of the 20 foodservices were found to maintain one unified working area, which suggests high probability of contamination of food/utensils/equipment in the cooking area by pre-preparation or dish washing. According to the microbiological analysis, the hygiene acceptance ratio of working facilities in the clean zone was 70%, which was higher than the average 45% hygiene acceptance ratio of working facilities in the contamination operating zone. There was a significant difference in the total plate count (P<0.001) and coliform count (P<0.01), which demonstrates that work tables in the clean zone were in a good state compared to those in the contamination operating zone. In the contamination operating zone, refrigerator shelves had a high probability of cross-contamination. Regarding the floor surface and airborne microbes, cooking areas which should be maintained as clean zones had higher cross-contamination probability than those in the contamination operating zone. So corrective actions such as cleaning and sanitizing, keeping dry floors, lowered temperature and humidity, shoe disinfecting facilities, and checking concentrations, are necessary to manage floor surfaces and airborne microbes in the cooking area.

• Journal of Electrical Engineering and Technology
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• 제12권1호
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• pp.249-255
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• 2017

Efficient operation of induction motor at light loads has been getting wide attention recently because the operating of induction motor at light loads occupies big portion of its operating regions in many applications such as environment friendly vehicle. As one of approaches to improve efficiency, Adaptive Maximum Torque Per Amp (Adaptive MTPA) control for induction motor drives has been proposed to achieve a desired torque with the minimum possible stator current. However, the Adaptive MTPA control was validated only at heavy load where, in general, control scheme tends to perform better than at light loads since the error in measurement of sensors is lower and signal to noise is better. Thus, although the performance of a control scheme is good at rated operating point, its performance at light load is somewhat in doubt in practice. This has led to considerable interest in efficiency of Adaptive MTPA control at light loads. This work experimentally demonstrates performance of Adaptive MTPA control at light loads regardless of rotor resistance variation, thus showing its good performance over all operating conditions.

• Advances in robotics research
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• 제2권2호
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• pp.113-127
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• 2018

Robotics and automation are rapidly growing in the industries replacing human labor. The idea of robots replacing humans is positively influencing the business thereby increasing its scope of research. This paper discusses the development of an experimental platform controlled by a robotic arm through Robot Operating System (ROS). ROS is an open source platform over an existing operating system providing various types of robots with advanced capabilities from an operating system to low-level control. We aim in this work to control a 7-DOF manipulator arm (Robai Cyton Gamma 300) equipped with an external vision camera system through ROS and demonstrate the task of balancing a ball on a plate-type end effector. In order to perform feedback control of the balancing task, the ball is designed to be tracked using a camera (Sony PlayStation Eye) through a tracking algorithm written in C++ using OpenCV libraries. The joint actuators of the robot are servo motors (Dynamixel) and these motors are directly controlled through a low-level control algorithm. To simplify the control, the system is modeled such that the plate has two-axis linearized motion. The developed system along with the proposed approaches could be used for more complicated tasks requiring more number of joint control as well as for a testbed for students to learn ROS with control theories in robotics.

• 한국염색가공학회지
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• 제16권4호
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• pp.10-18
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• 2004

In this work, Aqueous sericin solution was prepared by degumming process with electrolytic reduction water. Then, the microfiltration and ultrafiltration systems were applied to the concentration of aqueous sericin solution. The objective of this study was to select the optimum operating condition among the different pressure. The permeate flux and rejection ratio were observed with time, pressure, flow rate and concentration. and, the wastewater and permeated water quality values such as pH, BOD, COD, and NH levels were measured. In order to see the influence of electrolytic reduction water, the flux of pure water and electrolytic reduction water by PVDF22(MF) and PS100(UF) membrane was measured. In microfiltration system, the relative flux reduction decreased rapidly to 0.02 in the 30min, as the concentration polarization and gel layer formation were increased. and then the sericin concentration rejection ratio was 40%. In ultrafiltration system, the permeate flux decreased with time and concentration, and increased with the operating pressure and flow rate. Optimal condition in PS100 membrane system for sericin concentration was operating pressure 1.464kgf/$cm^24, operating flow rate $7\ell/min at\; 40^{\circ}C$. At that time, sericin concentration rejection ratio was 83% respectably. The sericin solution was concentrated from 0.1wt% solution to 0.2 wt % solution during about 2 hrs by the UF filteration membrane system.

• 산업공학
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• 제23권3호
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• pp.221-228
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• 2010

With the development of science and technology, modern submarines are equipped with high technology devices and multi-functioned precise armaments, consequently, acquisition cost as well as maintenance cost of the submarines are getting higher and higher. However, tight defense budget forces navy to significantly reduce military operating and maintenance costs. In this study, the maintenance and operating costs of submarine Jangbogo-II are estimated through M&S (Modeling and simulation) methodologies in order to reasonably and consistently work out the requirement verification system of Jangbogo-II. The maintenance and operating costs of Jangbogo-II along the next 25 years are estimated as 312.65 billion won via engineering analysis methods while 312.69 billion won from PRICE Model, which shows only 0.04 billion won differences as a whole. This study is expected to be able to provide meaningful decision making data for not only short and/or mid term operating planning but military budgeting.

• 임상간호연구
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• 제20권2호
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• pp.162-176
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• 2014

Purpose: The purpose of this study was to perform an operating room nursing activities analysis and estimate nursing intensity of each nursing activity based on the Relative Value Scale (RVS). Methods: The methodology for this study of RVS was based on the work of Hsiao et al. The first stage was to identify nursing activities and the second to measure intensity of nursing activities including technical skill, mental effort, and stress. Results: Calculation of the RVS for 99 nursing practices showed a score range from 300.00 to 1337.78. CS operation assistant, OS operation assistant, and obtaining certification had high nursing intensity. Surgical hand washing, putting on surgical gowns, surgical gloves and surgical caps and mask had low nursing intensity. Conclusion: The activities of operating room are not compensated separately but reimbursement is usually included in physician fees. In the future, an estimation of nursing cost should show the nursing contribution rate to total operation revenue.