• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.04a
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• pp.401-404
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• 2000

최근 제조환경은 다양한 소비자의 요구, 제품의 짧은 수명 주기, 치열한 국내외 경쟁 등으로 특징 지워진다. 이러한 제조환경에 적응하기 위하여 FMS(flexible manufacturing systems)에서 기계의 종류는 다기능 공작기계(versatile machine)로 구성되고, 공구는 빠른 공구 이동장치(tool delivery system)에 의하여 제어되는 추세에 있다. 공구 이동장치를 이용하여 가공 중에 필요한 공구를 다른 기계 또는 공구 저장장치로부터 공급하는 동적 공구할당 전략하의 FMS 에서는 공구의 가용여부(작업 일정계획)를 고려한 작업순서 결정이 중요한 문제이다. 본 연구에서는 동적 공구할당 전략하의 FMS 에서 한 부품 또는 한 셋업에서 공구대기시간을 줄이는 방향으로 공구할당을 수행하는 작업순서 알고리즘을 제안하고, 시뮬레이션 실험을 통하여 다른방법으로 공구할당을 수행하는 알고리즘과 비교함으로써 본 작업순서 알고리즘의 우수성을 입증한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.426-431
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• 1997

Features are well recognized to play an important role for the integration of ACD and CAPP. Majority of pervious works for the feature recognition for prismatic part is based on 3D solid model. But in real factories, 2D drawing are used more than 3D drawings. In this paper, we develope an algorithm of the feature recognition on prismatic parts in 2D drawings, using by the graph method and the heuristic algorithm. Previous algorithms have some conflicts at feature interaction. In this paper, elements are grouped into connection by the graph method. Then features are recognized by using these grouped elements and their relationships of front and side-view. For resolving the problem of feature interaction, the element graphs are modified by an deloped algorithm. This algorithm is applied to a CAPP system for milling process planning.

• Solar Energy
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• v.17 no.3
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• pp.13-21
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• 1997

In this study, the theoretical equation of thermal storage efficiency was established to applied long term hot water storage system. The, effective thermal diffusivity and storage efficiency were, measured through the experiment to predict the degree of mixture in thermal storage tank. The effective thermal diffusivity was inversely preportional to the storage efficiency. The most effective storage efficiency was obtained under condition of low flow rate and using the perforated distributor.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1982.05a
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• pp.7.3-7
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• 1982

Endotracheal intubation is common practice for either general anesthesia or keeping artificial airway in various conditions. Despite of its great usefulness, however, laryngeal edema, ulceration, and granuloma are occasionally developed following endotracheal intubation as posttraumatic complications. Vocal cord paralysis is also rarely developed. Recently we experienced a case of left vocal cord paralysis with accompanying hoarseness following endotracheal general anesthesia for appendectomy. The symptoms of hoarseness and sore throat developed immediately after the general anesthesia. Periodic check revealed gradual return to normal function of the paralyzed cord with the complete function about 3 months after the anesthesia.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.1-13
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• 2005

Recently, The business environment is very rapidly changed and complicated. Therefore, the companies are confront with the biggest difficulty. To overcome this difficulty, the management should be able to accomplish the human resources management and the efficient business management. KR(Korea Railroad) has a close association with national life as it carries out public works based on its public nature as well as purses the corporate spirit. For that reason, KR has a great spin-off on national economy and exerts a tremendous impact on the improvement of productivity around the industries and the international competitiveness at aspect of efficiency resulting from business rationalization. Railroad system can be described as organic. Railroad Experts take a great role in this system. According the psychology and the Organization Behavior, the decision maker's personality and employee' work satisfaction have influence on performance. The purpose of this study is to examine the Railroad Experts' Personality and Work satisfaction which influence on the efficient business management.

• Journal of the Korean Society for Railway
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• v.5 no.4
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• pp.209-214
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• 2002

Belief revision involves integrating new information with the current belief. It is a ubiquitous human activity. A critical feature of belief revision lies in its sequential nature. Railroad system can be described as organic. Engine drivers take a great role in this system. Recently, Hogarth and Einhorn(1992) have posited a belief-adjustment model for updating beliefs. Based on a sequential anchoring and adjustment strategy, the model is important for decision makers. The sequential nature of information processing is affected by some task variables. The purpose of this study is to examin factors which influnce on the Enginr Driver's belief revision process. The factors are the order, experience and task. The difference of belief revision is due to the order and experience level.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.25 no.4
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• pp.8-15
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• 2002

This paper proposes a case study to treat planning and scheduling in factory of supply chain. In fact, the planning and the scheduling of a factory are not easily solved because of constraints of facility resources, material requirements, allowed planning times, and so on. However many packages are developed by vendors in Advanced Planning and Scheduling(APS) aspects to solve these problems. Therefore, in this paper, we analyze problems of an electronic company and apply the tool, Factory Planner(FP), to solve problems. The FP, which was developed by if technologies, is very popular planning and scheduling tool in the world. Also, the tool is successfully applied to many fields.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.11a
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• pp.206-208
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• 2013

국내 케이블TV는 이날로그방송 뿐만 아니라 디지털방송, 주문형 비디오, 초고속 인터넷, 양방향 서비스, 인터넷 전화 등의 다양한 서비스를 제공하고 있다. 하지만 종편, 보도, 홈쇼핑 등의 신규 채널 증가와 방송 통신 융합에 따른 다양한 양방향 서비스 도입, 시속적인 HD채널 확대 등으로 헌재 사용 가능한 주파수가 매우 부족한 상황으로 3DTV, UHDTV, 인터넷 기반방송 등의 차세대 방송 서비스 제공을 위한 주파수 확보 방안 마련 이 매우 시급하게 필요한 상황이다. 본 논문에서는 국내 케이블TV의 주파수 이용 현황 및 신규 주파수 수요 전망을 예측하고 다양한 효율적인 주파수 해결 방법을 모색하고 단계적으로 해결 방법을 적용하여 주파수를 확보하는 효율적인 주파수 이용방안에 대해서 기술하였다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.21 no.2
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• pp.209-216
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• 1997

A feature is well known as a medium to integrate CAD, CAPP and CAM systems. For a part drawing including both simple geometry and compound geometry, a process plan such as the selection of process, machine tool, cutting tool etc. normally needs simple geometry data and non-geometry data of the feature as the input. However, a extended process plan such as the generation of process sequence, operation sequence, jig & fixture, NC program etc. necessarily needs the compound geometry data as well as the simple geometry data and non-geometry data. In this paper, we propose a feature data model according to the result of analyzing necessary data, including the compound geometry data, the simple geometry data and the non-geometry data. Also, an example of the feature data model in milling process planning is described.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.84-85
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• 2012

본 논문에서는 충수염 영상 분석에 필요한 두께, 염증의 변화량 등의 자료를 객관적으로 측정할 수 있도록 하기 위해 초음파 영상에서 충수염을 추출하는 방법을 제안한다. 초음파 영상은 동일한 환경에서 영상을 촬영할 수 없기 때문에 객관적인 분석을 위해 초음파 영상을 표준화 한다. 본 논문에서 사용된 영상은 표준화된 초음파 영상을 대상으로 하였으며, 충수염 추출 과정은 표준화된 초음파 영상에서 최하단 근막을 추출한 뒤, 추출된 최하단 근막을 기준으로 충수를 추출한다. 제안된 방법을 초음파 영상을 대상으로 실험한 결과, 제안된 충수염 추출 방법이 측정자가 직접 충수염을 추출하여 분석하는 방법보다 효과적인 것을 확인할 수 있었다.