• 전기의세계
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• 제14권4호
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• pp.8-17
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• 1965

Firstly, this study has analyzed the following factors affecting the optimum specifications and design of distributive transformers: 1. Facilities installation cost per unit power output. 2. Facilities operating & maintenance cost per unit power output. 3. Production cost per unit power output. 4. Load factor. 5. Loss factor. Secondly, it has clarified the relations between the following factors and the specifications and design of distributive transformers; 1. No-load loss., 2. Load loss., 3. Voltage regulation., 4. Exciting current. Finally, it has determined the method of the most economic design for the transformers using the above factors and relations, and, for optimum the illustrative purpose, suggested their optimum specifications, way of evaluation, and merits by means of typical example.

• 대한안전경영과학회지
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• 제7권4호
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• pp.49-59
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• 2005

This paper is to propose various safety design models of tolerance specifications with different consumer requirements. In these models, tolerance specifications can be jointly determined by considering all the stochastic, economic, robust and engineering safety design factors with various characteristics of interest. In this paper, the proposed models are easily formulated for design engineers.

• 한국광학회지
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• 제33권1호
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• pp.35-44
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• 2022

광학계는 매우 다양한 용도로 사용되고 있기 때문에 유사한 구성의 광학계에서도 활용목적과 주어진 광학사양에 따라 다양한 설계가 존재한다. 하지만 광학수차는 광학계의 구조와 광학사양 모두에 영향을 받으므로 수차분석만으로는 광학설계의 고유한 특성을 파악하기 어렵다. 이 연구에서는 무차원의 설계변수를 사용하여 광학사양과 무관하게 광학설계의 수차특성을 파악하는 방법을 연구하고, 예시로서 서로 다른 용도와 사양을 가지는 4종의 triplet 설계를 분석하였다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2008년도 정기 학술대회
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• pp.490-494
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• 2008

U-Channel Bridge is effective bridge type, because its edge beam performs role of barrier and enables to reduce additional dead loads. Although it is effective to reduce additional dead loads, there is possibility of bridge collapse under impact load due to car crash. Also, edge beam must have ability to induce safe driving and prevent falling accidents. Therefore, it requires behavior analysis and property investigation through the vehicle impact crashing edge beam. This study presents method of structural analysis of U-channel bridge and investigates design specifications for the effect of the edge beam under the vehicle impact. Also, it carries out stability investigation of behavior of edge beam and slab, based on Korean Highway Bridge Design Specifications and AASHTO LRFD Bridge Design Specification.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.119-120
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• 2006

Prioritizing the design specifications among many alternatives is necessary at the stage of concept design. Design specifications have trade-offs between cost and performance, and the relationships among them, in the standpoint of various functional requirements, are complex. AHP(Analytic Hierarchy Process) method is one of the most popular ways of solving the priority setting problem. However, it is impossible to monitor the interim findings in the middle of the process, it is hard to predict the difference when changing pairwise comparison conditions, and the operation done by one person makes it hard to share the process simultaneously. This paper shows a new method of priority setting in this kind of decision making problem. This method is designed to support the realtime priority setting among many design specifications with regards to many functional requirements. A new algorithm and visualization methods are introduced, and the usability is verified in an exemplary concept design stage.

• 한국산학기술학회논문지
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• 제5권6호
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• pp.499-503
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• 2004

실제 시스템 개발현장에서는 사용자 요구사항과 관련 자료의 분석을 시작으로 크게 네 가지 단계 즉, 분석, 설계, 개발, 구현단계별로 각종 명세서들을 작성하고 있다. 명세서 일부는 자동화된 도구를 사용하여 연속적으로 작성되기도 하지만 모든 명세서가 자동화로 작성되는 것은 아니다. 이로 인해 작성되는 명세서간에는 많은 불일치 항목이 발생한다. 본 논문에서는 시스템을 개발할 때 각 단계별로 작성되는 명세서에 포함된 오류를 검출하는 방안을 제안하고, 이를 기초로 명세서 오류 검출 시스템을 설계 및 구현한다.

• 대한인간공학회지
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• 제13권2호
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• pp.13-24
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• 1994

The objectives of this study are twofold : (1) to investigate musculoskeletal discomfort for sedentary workers in offices ane (2) to revise the Korean Standard for the design of office chairs in order to reduce or eliminate the physical discomfort or the office workers. Two hundred seventy-one office workers from nineteen different companies companies were selected to evaluate the musculoskeletal discomfort and indibidual features of chair design. A statistical analysis of the survey rebealed that the office currently being used had two major deficiencies such as insufficient adjustability and inappropriate design specifications in ergonomic sense. A stepwise regression analysis showed that the deficiencies on the musculoskeletal discomfort of the workers. Based on the ergonomic design pronciples, was debeloped to revise the Korean Standard for the design specifications of office chairs. An application of the methodology was made amend the design specifications of the four factors such as seat pan height, seat pan width, and seat pan inclunation. Their effects were evident in the musculoskeletal discomfort of the workers.

• Wind and Structures
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• 제7권6호
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• pp.393-404
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• 2004

The design of truss type sign support structures is based on the guidelines provided by the American Association of State Highway and Transportation Officials Standard Specifications for Highway Signs, Luminaries and Traffic Signals and the American Institute of Steel Construction Design Specifications. Using these specifications, the column design strength is normally determined using the effective length approach. This approach does not always accurately address all issues associated with frame stability, including the actual end conditions of the individual members, variations of the loads in the members, and the resulting sidesway buckling for truss type sign support structures. This paper provides insight into the problems with the simplified design approach for determining the effective lengths and discusses different approaches for overcoming these simplifications. A system buckling approach, also known as a rational buckling analysis, is used in this study to determine improved predictions for design strength of truss type sign support structures.

• 콘크리트학회지
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• 제20권6호
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• pp.47-50
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• 2008

Design of main and crescent bridges in Palm Jebel Ali, Dubai, is based on AASHTO LRFD. Additional standards and reports are also considered to reflect regional conditions. In addition, JAFZA's Bridge Design Guideline is reviewed for their approval. This article focuses on modified design requirements such as load and durability fit to the middle east area. Technical specifications are mentioned briefly.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 추계학술대회 논문집
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• pp.209-212
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• 2007

It is increased electrical energy consumption with the development of intelligence society in buildings and thus an energy conservation through efficient use of electricity and reliability, safety, etc became more important. This research paper intensively investigated performance based construction specifications and design criteria of electrical installations in domestic and foreign country. It is necessary to analyze the key features based on performance and general trend about contractor guarantee, warranty method, performance design criteria from the investigated data. This paper shows a reasonable performance based construction specifications and design criteria of electrical installations.