• 문화기술의 융합
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• 제4권1호
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• pp.139-151
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• 2018

본 연구는 암환자를 돌보는 임상간호사를 위한 통합적 완화 돌봄 역량 강화 프로그램을 개발하고, 이를 적용하고, 그 효과를 검정하기 위해 실시되었다. 연구방법: 대상자는 D시 소재 2개 대학병원에 근무하는 간호사를 대상으로 편의추출 하였으며, 실험군 17명, 대조군 20명으로 총 37명을 대상으로 하였다. 실험군을 대상으로 통합적 완화 돌봄 역량 강화 프로그램을 2016년 10월 5일~11월 16일까지 주 1회, 7주간 시행하였으며, IBM SPSS Statistics version 19.0 for Windows 프로그램을 이용하여 분석하였다. 연구 결과 및 결론: 본 연구 결과 통합적 완화 돌봄 역량 강화 프로그램은 간호사의 통합적 완화 돌봄, 공감 역량, 윤리풍토에 향상에 효과적인 프로그램임이 검증되었다. 본 연구 결과를 토대로 다양한 건강 전문직과의 융합하여 적용 가능한 프로그램 개발이 요구된다.

• 한국보육지원학회지
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• 제9권1호
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• pp.221-239
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• 2013

본 연구는 어린이집에 근무하고 있는 보육교사들이 동료교사와의 관계 속에서 어떠한 갈등을 경험하고 있는지 그리고 갈등상황에서 어떻게 대응하고 있는지 심층면담을 통하여 알아봄으로써, 동료교사와의 갈등을 원만히 해결하기 위한 시사점을 제공하고자 하였다. 보육교사로 재직 중인 교사5명을 연구대상으로 하였고, 면담은 2011년 9월 7일부터 2011년 10월 4일까지 각각 3~4회 이루어졌다. 수집된 자료를 분석한 결과 보육교사는 동료교사와의 관계 속에서 경력에 따른 위계질서, 미흡한 사회적 관계 맺기 기술, 개인이 가진 가치관 및 교육관의 차이, 비지원적인 동료교사관계 등으로 인하여 어려움을 겪고 있었다. 이러한 갈등상황 속에서 교사개인의 판단 및 관계 개선에 대한 의지에 따라 동료교사와의 관계에 긍정적 또는 부정적인 영향을 미치는 것으로 나타났다. 이처럼 동료교사와의 관계 속에서 다양한 갈등을 경험하고 있었으며, 갈등 및 대응과정을 통해서 교사관계의 중요성을 인식하고 있었다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2009년도 추계학술발표대회 논문집
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• pp.80-85
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• 2009

Mathematical modeling and performance simulation results were shown for the solar thermal storage system which used heat pipe. The thermal storage system was composed of thermal storage tank and charging/discharging heat exchanger with one by the heat pipes. Heat pipe heat exchanger was attached to system, and could carry out charging and discharging to thermal storage tank at the same time. Height of the thermal storage tank was 600 mm, and that of the charging/discharging heat exchanger was 400 mm. Length of the heat pipe was the same as the total height of thermal storage system, and outer and inner diameter were 25.4 mm(O.D.) and 21.4 mm(I.D.) respectively. Diameter of the circular was 43 mm(O.D.), and fin geometries were considered as the design parameters. High temperature phase change material(PCM), $KNO_3$ and low temperature PCM, $LINO_3$ were charged to storage tank to adjust working temperature. Total size of thermal storage system able to get heat capacity more than 500 kW was calculated and the results were shown in this study. Number of heat pipe was required more than maximum 500, and total length of thermal storage system was calculated to the more than maximum 3 m at various condition.

• 한국초전도ㆍ저온공학회논문지
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• 제14권4호
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• pp.50-53
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• 2012

This paper describes experimental study on GM-type pulse tube refrigerator (PTR). In a PTR, the pulse tube is only filled with working gas and there exists secondary flow due to a large temperature difference between cold-end and warm-end. The stability of secondary flow is affected by orientation of cold-head and thus, the cooling performance is deteriorated by gas mixing due to secondary flow. In this study, a single stage GM-type pulse tube refrigerator is fabricated and tested. The cooing performance of the fabricated PTR is measured as varying cold-head orientation angle and the results are used as reference data. Then, we divided interior space of pulse tube into three segments, and fixed the various size of screen mesh at interface of each segment to suppress the performance degradation due to secondary flow. For various configuration of pulse tube, no-load test and heat load test are carried out with the fixed experimental condition of charging pressure, operating frequency and orifice valve turns. From experimental results, the fine screen mesh shows the effective suppression of performance degradation for the large orientation angle, but the use of screen mesh cause the loss of cooling capacity rather than the case of no insertion into pulse tube. It should be compromised whether the use of screen mesh in consideration of the installation limitation of a GM-type pulse tube refrigerator.

• 한국산학기술학회논문지
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• 제12권12호
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• pp.5450-5456
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• 2011

선박을 건조하는 수많은 공정 중에서 화물창 내의 도장작업은 대부분 고공에서의 작업뿐만 아니라 밀폐된 탱크 내에서 작업을 하는 경우가 많기 때문에 항상 사고의 위험에 노출되어 있다. 이러한 문제를 해결하는 방법으로 진공 펌프와 로봇에 장착된 흡착판을 이용하여 로봇을 벽면에 부착하는 방법이 개발되어져 왔다. 하지만 이러한 방법들은 다양한 재질의 벽면에 적용이 가능하다는 장점이 있는 반면에 흡착판이 고착된 상태에서 이동하기 힘들다는 것과 부착을 위해 부가장비와 그에 따른 제어가 요구된다는 단점이 있다. 이러한 단점을 보완하기 위해 본 논문에서는 자석의 성질을 이용하여 선체의 평면, 수직면까지 매달린 채도 이동가능한 자석대차를 이용한 자동 도장 로봇장치를 제안한다. 또한 시제작품을 제작하여 성능 실험을 위해 자석바퀴 부착력, 대차부착력, 견인력 및 자동주행실험을 하였다.

• Journal of Biosystems Engineering
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• 제35권6호
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• pp.373-379
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• 2010

This study was carried out to develop a belt pick-up type one-row soybean cutter, using physical properties and production conditions of soybeans. The prototype soybean cutter consisted of 4 parts: cutting part, conveying part, collecting part, and travelling part. The prototype soybean cutter was designed to cut soybeans planted with a row spacing of 600 mm, and at a height of 30 mm from the bed bottom using a disk saw. Through various trials with different peripheral velocities of the disk saw and forward speed of the cutter, determined ranges of the peripheral velocity of the disk saw cutting soybeans stems were greater than 18.3 m/s. Spacing between pick-up belts (clearance) was in a range of 60~90 mm so that soybeans could be picked at heights greater than 25 cm, and the size and shape of the pick-up belt were determined the conventional manual harvesting method. The optimal ratio between the forward speed of cutter and the peripheral speed of pick-up belts were from 1 to 1.2 by theoretical analysis. the pick-up belts had a $35^{\circ}$ of tilted angle and $90^{\circ}$ of twisted angle to pick up soybeans safely from the plant input to the lower end of the belts and convey soybeans to the upper end of belts nearby a container. The soybeans at the rear container were dropped down on the soybean row with an interval. The effective field capacity of the prototype soybean cutter was 0.136 ha/h, reducing the working hour by 92% when compared with the manual cutting.

• Journal of Biosystems Engineering
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• 제38권1호
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• pp.33-40
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• 2013

Purpose: The goal of this study was to build an accurate digital factory that evaluates the performance of a factory using computer simulation. To achieve this goal, we evaluated the effect of worker-related variables on production in a simulation model using comparative analysis of two cases. Methods: The overall work process and worker-related variables were determined and used to build a simulation model. Siemens PLM Software's Plant Simulation was used to build a simulation model. Also, two simulation models were built, where the only difference was the use of the worker-related variable, and the total daily production analyzed and compared in terms of the individual process. Additionally, worker efficiency was evaluated based on worker analysis. Results: When the daily production of the two models were compared, a 0.16% error rate was observed for the model where the worker-related variables were applied and error rate was approximately 5.35% for the model where the worker-related variables were not applied. In addition, the production in the individual processes showed lower error rate in the model that included the worker-related variables than the model where the worker-related variables were not used. Also, among the total of 22 workers, only three workers satisfied the IFRS (International Financial Reporting Standards) suggested worker capacity rate (90%). Conclusions: In the daily total production and individual process production, the model that included the worker-related variables produced results that were closer to the real production values. This result indicates the importance of worker elements as input variables, in regards to building accurate simulation models. Also, as suggested in this study, the model that included the worker-related variables can be utilized to analyze in more detail actual production. The results from this study are expected to be utilized to improve the work process and worker efficiency.

• 한국안전학회지
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• 제35권5호
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• pp.1-8
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• 2020

Mobile elevating work platforms (MEWPs) consist of a work platform, extending structure, and chassis, and are used to move persons to working positions. MEWPs are useful but are composed of pieces of equipment, and accidents do occur owing to equipment defects. Among these defects, accidents caused by the fracture of bolts fixed to the extension structure and swing system are increasing. This paper presents a failure analysis of the fixing bolts of MEWP. Standard procedure for failure analysis was employed in this investigation. Visual inspection, chemical analysis, tensile strength measurement, microstructural characterization, fractography analysis by Optical Microscope(OM) and Scanning Electron Microscopy(SEM), and finite element analysis (FEA) were used to analyze the failure of the fixing bolts. Using this failure analysis approach, we found the root cause of failure and proposed a means for solving this type of failure in the future. First, the chemical composition of the fixing bolt is obtained by a spectroscopy chemical analysis method, which determined that the chemical composition matched the required standard. The tensile test showed that the tensile and yield strengths were within the required capacity. The stress analysis was carried out at five different boom angles, and it was determined that the fixing bolt of MEWP can withstand the loads at all the boom angles. The outcomes of the fatigue analysis revealed that the fixing bolt fails before reaching the design requirements. The results of the fatigue analysis showed primarily that the failure of the fixing bolt was due to fatigue. A visual inspection of the fractured section of the fixing bolt also confirmed the fatigue failure. We propose a method to prevent failure of the fixing bolt of the MEWP from four different standpoints: the manufacturer, safety certification authority, safety inspection agency, and owner.

• 한국산학기술학회논문지
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• 제17권5호
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• pp.74-79
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• 2016

수도권 지하철은 1974년, 서울 1호선 개통을 시작으로 현재 일일 7,289천 명을 수송하는 가장 중요한 교통수단 역할을 하고 있다. 이처럼 서울 지하철은 2011년 이후 지속적으로 증가하는 수송인원을 처리하고 있지만, 제한된 지하철 용량과 배차시간 때문에 지하철 내의 혼잡도는 계속 증가하고 있는 실정이다. 이에 서울시는 서울역, 시청역, 교대역 등 12개의 역사에 우회통로 건설 등의 혼잡역사 구조 개선사업을 시행하고 있다. 하지만 이러한 사업은 한 역사 당 평균 186억 원의 대규모 공사비에 비해 미미한 개선 효과를 보이면서 혼잡도 개선을 위한 차선책이 필요한 실정이다. 따라서 본 연구는 효율적인 객차 및 역사 내 혼잡도 완화를 위해 IoT를 접목한 혼잡도 평준화 시스템을 제안하였다. 제안한 시스템을 바탕으로 예상 효과 분석을 진행하였고, 분석 결과 한 객차에 승차하는 인원이 기존 34명에서 최대 20명으로 감소되는 효과가 나타났다. 이와 더불어 기존 첨두시 20대의 열차 운행대수가 24대로 증차될 수 있다고 분석되면서 운영 효율성 측면에서 효과가 있을 것으로 사료된다.

• 산업경영시스템학회지
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• 제38권4호
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• pp.149-158
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• 2015

Up-to-date manufacturing companies have faced a market-driven environment of pull production order. There should be a difference in operating manufacturing resources according to the type, quantity, and delivery time of manufactured products, because the process situation in pull production is changed by customer orders. And it should be taken into account from the stage of preparing for production such as process design and the placement and utilization of manufacturing resources. However, the feasibility of production plans is limited because most of small manufacturing businesses make production/supply plan of the parts and products assuming that equipment abilities in scheduling is sufficient without managing process standard information systemically. In this study, a discrete event simulation system based on BOM (bill of material), that is F-OPIS (online productivity innovation system), is introduced and a case study on application of the system leading to improving productivities is presented. F-OPIS deals with a decision-problem on production management and it is specialized for small-and- medium sized manufacturing companies. The target company of this case study is a typical small-and-medium sized manufacturing company in Korea, that produces various machined parts. The target company adopts make-to-stock production management to prevent tardy delivery because of fluctuations in demand. Therefore, it is required to apply an efficient inventory control solution for improving productivities. In this paper, based on the constraints of working capacity of manufacturing resources, the bottleneck process is analyzed as production conditions are changed. Consequently, an improvement plan is proposed, that eventually enhances overall utilization rates of resources in the bottleneck process and reduces overall production lead-time and inventory level.