• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제54권6호
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• pp.261-268
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• 2005

This paper propose the safety design of automatic train control system which is used for controlling and monitoring train speed not to excess a permitted speed. Safety activities are shown for the computerized system to achieve a required safety requirement. The safety activities are composed of system dynamic modelling to identify potential hazards contained in the target system, to analyze sub system faults to provoke the hazards. Risks analysis are carried out to estimate losses caused from the hazards to allocate safety requirement. We Proposed design solutions for sub system to meet safety requirement.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.127-128
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• 2008

Research and development status of Dog-Horse robot is presented based on the critical technology issues which generates severe problems or hard trade-offs to meet the general requirement of system and new technologies. This paper covers from architectural problems to specific technology to overcome the operational requirement. Technology development based on operation requirement derived new research challenges as well as advanced development for system adaptation.

• 전기학회논문지
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• 제65권7호
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• pp.1161-1168
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• 2016

Battery energy storage system(BESS) attract the attention of the power system operators with its fast response to a disturbance in spite of its limited energy capacity. This paper proposes the operating method of BESS for following the Automatic Generation Control(AGC) frequency control which is centrally distributed by a system operator. As BESS needs to just meet the control requirement from the system operator, it should be able to properly manage the state of charge(SOC) of BESS to be available to control signal. For doing these, the proposed method distributes the control requirement to available batteries in proportion to its SOC. In addition, unavailable batteries are controlled to recover the SOC to an appropriate range, and the recovering power is supplied by available batteries meeting the control requirement. Moreover, the proposed method manages the efficiency of power conversion system (PCS) by limiting the number of PCS to be assigned for the low control requirement. Finally, the case studies are carried out to verify the effectiveness of proposed strategy.

• 보건의료산업학회지
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• 제5권3호
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• pp.77-88
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• 2011

As same time of starting on the Korean Long-term Care Insurance System, the government developed a program to train new qualification of long-term care workers. The number of enrolled long-term care workers are 950,000 persons in 2010. Mostly they are working in home based care work places such as home visit care centers and home visit bathing centers covered insurance. The purpose of this study is to understand the difference of task performance requirement according to long-term care workers' responsibilities which divided into home visiting care and home visiting bathing. The comparison analysis was conducted to task performance requirement in basic management, safety management, administration management, practical services. Key result was found that task performance requirement of long-term care workers whose responsibilities are home visiting care were more higher than the home visiting bathing. Finally, To improve quality of home visiting care and home visiting bathing, it is necessary to provide the fields based continuing education and reflect new reimburse system.

• 한국정보통신학회논문지
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• 제15권9호
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• pp.2050-2058
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• 2011

본 논문은 항공기의 항공 전자에 내장된 비행운용프로그램을 개발하기 위한 요구도 관리 시스템을 제시한다. 제시된 시스템은 비행운용프로그램을 개발하기 위한 요구사항분석, 설계, 구현 테스트결과와 요구도 수정 로그 등을 효과적으로 관리한다. 기존의 상업용 요구도 관리시스템은 보다 다양한 기능을 가지고 있지만 이들 대부분의 도구들은 너무 복잡하고 상대적으로 구입가격이 비싸며 유지보수 비용이 크다. 본 논문에서 개발된 시스템은 항공전자 장비 비행운용프로그램 개발에 특화된 시스템으로서 사용의 용이성과 비용 면에서 효율적인 시스템이다.

• Asia pacific journal of information systems
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• 제26권2호
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• pp.322-337
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• 2016

Research on information systems and software engineering has often neglected behavioral effects, which may play a role in decision making on software development. The current study addresses this issue by empirically investigating the behavioral roots of over-requirement in the context of a software development project via an experiment. The negative phenomenon of over-requirement refers to specifying a software system beyond the actual needs of the customer or the market, which overload the system with unneeded features. The research question addressed here is whether over-requirement is due in part to the emotional involvement of developers with the software features they developed because of behavioral effects. Previous studies have demonstrated that under the endowment, I-designed-it-myself, and IKEA effects, people become emotionally involved and overvalue physical items that they respectively possess, self-design, or self-create. The findings of our experiment show that participants over-valued features they were assigned to be responsible for, to specify, or to construct, thereby confirming that the three behavioral effects play a role in software development decisions and affect over-requirement. Thus, the study contributes to software development research and practice from the behavioral economics perspective, highlighting the roots of over-requirement.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집E
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• pp.469-473
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• 2001

It is very important that piping system shall meet the optimum design requirement as predicted in designing system. If the piping system proved not to meet the requirement in commission it shall be redesigned and corrected till the required capacity is satisfied. which costs much expense. The objective of this study is to understand steady 3-dimensional flow phenomena in a process piping system numerically. 3-dimensional numerical simulations with standard $k-{\epsilon}$ model were carried out by using ALGOR code for three cases of Reynolds number. 2500, 3500 and 4500, based on inlet pipe diameter and three cases of inflow air temperature, $20^{\circ}C,\;50^{\circ}C$ and $100^{\circ}C$.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.419-419
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• 2000

This paper describes a requirement analysis for automotive engine design using a computer aided systems engineering tool RDD-100. Because the engine is a complex system with many subsystems, there are many needs of stakeholder throughout the life-cycle of the engine. The originating requirements have been derived from the needs and decomposed into leaf-node requirements with the tool. Many requirement errors have been detected during the decomposition process and resolved by modifying the requirements. Inconsistency problems have been also resolved with the tool, Analysis of engine requirements using RDD-100 brings clarity to engine design early in the development process.

• 지능정보연구
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• 제14권4호
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• pp.161-178
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• 2008

실제 물리적 공간에 유비쿼터스 서비스를 개발하여 실현하는 작업이 유비쿼터스 지능 공간 구축을 위해 진행 중에 있다. 또한 이와 같은 유비쿼터스 지능 공간 개발은 전 세계적으로 다양한 분야에서 이루어지고 있다. 이러한 유비쿼터스 지능 공간을 개발하기 위한 방법론 중에서 먼저 시나리오를 제작 분석하고 이에 따라 요구분석과 설계를 하기도 하며 역으로 개발에 고려하고 있는 유비쿼터스 기술로 먼저 설계나 요구분석을 실시하고 이후에 시나리오를 통하여 실현 가능성을 보이기도 한다. 그러나 시나리오 제작과 요구분석이 상호 유사한 내용을 공유하고 있음에도 불구하고 별도로 제작하는 과정에서 불일치와 많은 노력이 소모된다. 따라서 본 논문의 목적은 시나리오 제작과 요구분석 문서를 생성하는 시스템을 제안하는 것이다.

• Journal of Biosystems Engineering
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• 제36권2호
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• pp.79-88
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• 2011

The purpose of this study was to analyze power requirement of an agricultural tractor by major field operations. First a survey was conducted to obtain annual usage ratio of agricultural tractor by field operation. Plowing, rotary tillage, and loader operations were selected as major field operations of agricultural tractor. Second, a power measurement system was constructed with strain-gauge sensors to measure torque of four driving axles and a PTO axle, speed sensors to measure rotational speed of the driving axles and an engine shaft, pressure sensors to measure pressure of hydraulic pumps, an I/O interface to acquire the sensor signals, and an embedded system to calculate power requirement. Third, the major field operations were experimented under fields with different soil conditions following planned operation paths. Power requirement was analyzed during the total operation period consisted of actual operation period (plowing, rotary tillage, and loader operations) and period before and after the actual operation (3-point hitch operating, forward and reverse driving, braking, and steering). Power requirement of tractor major components such as driving axle part, PTO part, main hydraulic part, and auxiliary hydraulic part were measured and calculated to determine usage ratio of agricultural tractor power. Results of averaged power requirement for actual field operation and total operation were 23.1 and 17.5 kW, 24.6 and 19.1 kW, and 14.9 and 8.9 kW, respectively, for plowing, rotary tillage, and loader operations. The results showed that rotary tillage required the greatest power among the operations. Averaged power requirement of driving axles, PTO axle, main hydraulic part, and auxiliary part during the actual field operation were 8.1, 7.8, 3.4, and 1.5 kW, respectively, and the total requirement power was about 70 % (20.8 kW) of the rated power. Averaged power requirement of driving axles, PTO axle, main hydraulic, and auxiliary hydraulic for the total operation period were 6.5, 6.0, 2.1, 0.9 kW, respectively, and total requirement power was about 52 % (15.5 kW) of the rated power. Driving axles required the greatest amount of power among the components.