• 한국사회복지학
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• 제57권3호
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• pp.31-50
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• 2005

양성 평등을 보는 관점은 다양하다. 따라서 어떤 사회복지정책이 양성 평등에 기여하느냐 하지 않느냐를 판단할 때에는 그 사회복지정책을 통해 어떤 양성 평등을 추구할 수 있느냐에 대한 분석을 전제로 하게 된다. 그럼에도 불구하고 대체로 사회복지정책이 성차별 문제를 어떻게 야기하고 있는가에 대한 논의가 주류를 이루고 있을 뿐, 그 사회복지정책이 어떤 관점에서 봤을 때 어떤 성차별 문제와 관계를 갖는지에 대한 논의는 부족한 실정이다. 본 연구에서는 사회복지정책의 한 분야로서 국민연금제도를 젠더 중립적 관점(the gender neutral approach), 젠더 인정 관점(the gender recognition approach), 젠더 재구성 관점(the gender reconstruction approach), 젠더 강화 관점(the gender reinforcement approach)을 통해 분석해 보았다. 그 결과 국민연금제도는 현재 젠더 중립적 관점에 토대를 두고 변화하고 있음을 알 수 있었다. 그리고 국민연금제도가 갖는 이러한 경향성을 고려한 정책 비판을 후속 연구 과제로 남기게 되었다. 더 나아가 최근 국민연금제도를 통해 여성 수급권의 규모와 질을 확대하기 위해 제시되고 있는 연금 크레딧, 재혼 시 분할 수급권 및 유족연금 자격 유지, 기초 연금제가 실현될 경우 국민연금제도는 젠더 인정 관점을 가진 사회복지정책의 한 분야로서 성격 변화를 해 나갈 것으로 전망해 보았다.

• 한국군사과학기술학회지
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• 제14권5호
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• pp.788-797
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• 2011

This paper analyzes the accuracy on the approach and landing of aircraft to an airport through comparison with airbase Precision Approach Radar and aircraft track data of DGPS equipped in aircraft. The proposed analysis result could be a basis for verifying the possibility that DGPS can be utilized in Airbase precision approach and landing. Position identification capability of widely used commercial DGPS is fairly accurate on latitude and longitude, while there is a slight error for being used in an airbase accurate approach and landing of Category I precision when it comes to altitude. Thus, we tested accuracy by analyzing actual flight track data of high performance aircraft to verify the accuracy of the airbase approach and landing using DGPS. Through the research, we developed instrumentation to compare PAR track data with DGPS track data, which can be used in reducing the number of PAR verification Flight utilizing it as a system measuring PAR accuracy at PAR installation phase.

• 한국항행학회논문지
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• 제18권4호
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• pp.288-295
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• 2014

현재 사용 중인 계기착륙장치(ILS)는 시스템 특성상 동시에 다수의 입항하는 항공기가 사용하기 어렵고, 활주로 방향별로 장비들이 설치되어야 한다. 또한 착륙하는 항공기들이 일정한 구역에서 단일 비행경로만으로 착륙절차가 구성되어야 한다는 한계점이 있다. 이에 항공 교통량이 증가하게 된다면 입항하는 항공기들의 체공 시간이 더욱 증가하게 될 것이다. 이러한 한계점을 보완하기 위해 GNSS를 이용한 착륙시설로 GBAS가 개발 되었다. 본 논문에서는 비행시험 전 시뮬레이터를 이용하여 태안 비행장에서 실제 사용 하고 있는 항공기 착륙절차와 Curved approach를 이용한 절차를 비교 하였다. 비교 결과 Curved approach 절차를 이용하게 되면 기존절차보다 비행시간이 감소되어 연료 및 소음공역회피 등과 같은 효과가 일어 날 수 있을 것으로 판단된다.

• International Journal of Control, Automation, and Systems
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• 제1권3호
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• pp.368-375
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• 2003

Data fusion approach is investigated to avoid suction in the left ventricular assist system (LVAS) using a nonpulsatile pump. LVAS requires careful control of pump speed to support the heart while preventing suction in the left ventricle and providing proper cardiac output at adequate perfusion pressure to the body. Since the implanted sensors are usually unreliable for long-term use, a sensorless approach is adopted to detect suction. The pump model is developed to provide the load coefficient as a necessary signal to the data fusion system without the implanted sensors. The load coefficient of the pump mimics the pulsatility property of the actual pump flow and provides more comparable information than the pump flow after suction occurs. Four signals are generated from the load coefficient as inputs to the data fusion system for suction detection and a neural fuzzy method is implemented to construct the data fusion system. The data fusion approach has a good ability to classify suction status and it can also be used to design a controller for LVAS.

• ETRI Journal
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• 제37권1호
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• pp.175-185
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• 2015

This paper presents a system-of-systems (SoS) approach to the formal modeling of a cyber-physical system (CPS) for simulation-based analysis. The approach is based on a convergence technology for modeling and simulation of a highly complex system in which SoS modeling methodology, hybrid systems modeling theory, and simulation interoperation technology are merged. The methodology maps each constituent system of a CPS to a disparate model of either continuous or discrete types. The theory employs two formalisms for modeling of the two model types with formal specification of interfaces between them. Finally, the technology adapts a simulation bus called DEVS BUS whose protocol synchronizes time and exchange messages between subsystems simulation. Benefits of the approach include reusability of simulation models and environments, and simulation-based analysis of subsystems of a CPS in an inter-relational manner.

• 한국안전학회지
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• 제28권1호
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• pp.74-80
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• 2013

This study describes structural reliability analysis of actively-controlled structure for which random vibration analysis is incorporated into the first-order reliability method (FORM) framework. The existing approaches perform the reliability analysis based on the RMS response, whereas the proposed study uses the peak response for the reliability analysis. Therefore, the proposed approach provides us a meaningful performance measure of the active control system, i.e., realistic failure probability. In addition, it can deal with the uncertainties in the system parameters as well as the excitations in single-loop reliability analysis, whereas the conventional random vibration analysis requires double-loop reliability analysis; one is for the system parameters and the other is for stochastic excitations. The effectiveness of the proposed approach is demonstrated through a numerical example where the proposed approach shows fast and accurate reliability (or inversely failure probability) assessment results of the dynamical active control system against random seismic excitations in the presence of parametric uncertainties of the dynamical structural system.

• 한국자동차공학회논문집
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• 제5권6호
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• pp.13-27
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• 1997

In the modern design technology, a component should be designed to fit into the overall system performance. A design methodology is developed to expedite the mechan- ical design of complex mechanical systems, The relation between the system design and component design is defined by a top-down approach and the results from the system design are utilized in the component design process. As a design example, an automobile exhaust system is selected for the system design and a bellows is chosen for a component design. Design methodology based on the top-down approach consists of five steps; (1) Analysis of service load, (2) Development of a lumped parameter, (3) Completion of the system design, (4) Selection of the component topology, (5) Completion of the component design, A method using a equivalent matrix is developed in order to determine unknown external forces in linear structural analyses. The bellows is also analyzed by the finite element method using a conical frustum shell element. Various experiments are performed to verify the developed theories. The top-down desi- gn approach is demonstrated by a design case using structural and shape optimization technology. Since the method is relatively simple and easy compared to other methods, it can be applied to the general design where system and component designs are involves simultaneously.

• 가정과삶의질연구
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• 제20권5호
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• pp.137-147
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• 2002

Purpose of this study is to find the research direction to solve the housing problems for the elderly which based on approaches and issues in related studies. Research method was interpretative analysis of the articles issued from 1976 to 2002. Each approach (rationalistic approach, ecological approach, micro-sociological approach, typological approach, environment-psychological approach, welfare approach) produced helpful information and had relative merits. But the researchers must regard housing for the elderly as a social problem in macroscopic view to solve the housing problems for older people with welfare approach. As a result, to solve the housing problems with welfare approach for the elderly who live in their own place with community care, studies about lifetime home, care and repair, and management of housing for the elderly might be needed. And research about existing services, transfer system of services, financial problems, man power to manage the system might be needed to spread out the services to the middle class elderly.

• 전기의세계
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• 제21권4호
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• pp.39-44
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• 1972

This paper describes a new approach for minimizing working memory spaces without loosing too much amount of computing time in the analysis of power system faults. This approach requires the decomposition of alrge power system into several small groups of subsystems, forms individual bus impedance matrics, store them in the auxiliary memory, later assembles them to the original total system by algorithms. And also the approach uses techniques for diagonalizing primitive impedances and expanding the system bus impedance matrices by adding a fault bus. These scheme ensures a remarkable savings of working storage and continous computations of fault currents and voltages with the voried fault locations.

• Earthquakes and Structures
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• 제13권3호
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• pp.231-239
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• 2017

Fundamental period is one of the most critical parameters affecting the seismic design of buildings. In this paper, a very simple approach is presented for estimating the fundamental period of multiple-degree-of-freedom (MDOF) structures. The basic idea behind this approach is to replace the complicated MDOF system with an equivalent single-degree-of-freedom (SDOF) system. To realize this equivalence, a procedure for replacing a two-degree-of-freedom (2-DOF) system with an SDOF system, known as a two-to-single (TTS) procedure, is developed first; then, using the TTS procedure successively, an MDOF system is replaced with an equivalent SDOF system. The proposed approach is expressed in terms of mass, stiffness, and number of stories, without mode shape or any other parameters; thus, it is a very simple method. The accuracy of the proposed method is investigated by estimating the fundamental periods of many MDOF models; it is found that the results obtained by the proposed method agree very well with those obtained by eigenvalue analysis.