• 제목/요약/키워드: more economical dimension

검색결과 24건 처리시간 0.027초

프리스트레스트 콘크리트 거더 철도교의 최적설계 (Optimum Design of Prestressed Concrete Girder Railway Bridge)

  • 조선규;윤석구;서동주;정재동;김현우
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2004년도 추계학술대회 논문집
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    • pp.1125-1130
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    • 2004
  • The prestressed concrete girder bridges have been used widely at the domestic national road as well as highway because it is great in the functional and economical efficiency. Also it has the advantage of convenience of design and construction due to being given standard sections. However it could be easily verified that a standard section of P.S.C girder is excessive design, which has much more redundancy than is necessary against design loads. Thus, in this paper the formulation of the optimum design for PSC girder railway bridge is suggested and dominant design variables and constraints are inquired as performing the optimum design. The objective is adopted as total cost of PSC girder bridge ,and in order to effective optimum design, design variables are formulated as PSC girder section dimension and girder space as well. And constraints are formulated according to Korean railway design specification and considering construction-ability such as PS anchorage and girder space. Using the proposed optimum design system, optimum PSC girder bridge design has been performed. And from the results of analysis it is suggested to denote the optimum section which satisfies the structural safety ,and economical efficiency all together.

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아파트 노후도 평가지표 개발을 위한 기초연구 (A Preliminary Study on Housing Performance Indicators Evaluating the level of Deterioration of Apartments)

  • 조성희;이태경
    • 한국주거학회:학술대회논문집
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    • 한국주거학회 2008년도 춘계학술발표대회 논문집
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    • pp.225-230
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    • 2008
  • High-rise and high-density apartment complexes has been built and supplied on a large scale in the metropolis and metropolitan areas since 1980s in order to solve housing shortage in cities. Recently they are raising deterioration problems for aging more than 20 years. moreover, those problems show very special characters such as simultaneity and a large scale. The purpose of this study is to propose a direction for the development of the evaluating indicators to measure the level of deterioration of apartments. The level of deterioration of apartments can be evaluated by housing performance. In order to evaluate the deterioration comprehensively, the housing performance indicators should be developed on the social, economical, and physical dimension. This study analyzed the concept of the apartment deterioration and compared housing performance indicators through literature review. First of all, when considering various factors in the evaluation of the deteriorated apartments, such as evaluating ranges, attributes and dimensions, housing performance indicators should be structured with the hierarchical framework. Second, housing performance indicators evaluating the level of deterioration of apartments should include social, psychological, and cultural aspects of home environments in order to understand adequately the attitude of the middle class toward services that apartments provide. Third, in previous researches, most criteria have been developed and weighted based on only expert opinions regarding performance indicators. So, It is necessary to include residents' opinions in developing performance indicators since they can provide more practical and feasible aspects the experts could not experience or understand.

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의류쇼핑성향과 정보탐색활동이 점포선택행동에 미치는 영향 -부산시에 거주하는 여성소비자를 중심으로- (The Influences on Store Choice Behaviors by Clothing Shopping Orientations and Information Search Activities)

  • 하종경
    • 한국생활과학회지
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    • 제8권3호
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    • pp.499-509
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    • 1999
  • The purpose of this study is to make up an effective market strategy for distinguishing clothing shops through analysing the influences on store choice behaviors by demographical characteristics, clothing shopping orientations and information search activities as well as analysing the effects of information search activities according to clothing shopping orientations, together with clarifying the dimension of clothing shopping orientations and information search activities. Clothing shopping orientations were factor analyzed resulting five factors, such as Recreational Shopping, Store/Brand Loyalty, Economic Shopping, Fashion Synchronization, Careful shopping. Information search behavior were factor analyzed resulting five factors, such as mass media information, commercial media information, personal information, store information, past experience information. According to a result of looking into the influences of clothing shopping orientations on information search behaviors, as shopping orientation for pleasure, fashion synchronization orientation, brand store royal orientation & economical orientation go high, the search degree of store information & mass media information, commercial media information & personal information, past experience information and personal information raise up respectively more and more. The results of regression analysis at factors affecting the store choice behaviors are significantly different.

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농형 유도전동기의 회전자 형상과 단면적 변화에 따른 토크-스피드 곡선 비교 (Comparison of Torque-Speed Curve according to the Changes in Cross-Sectional Area and Shape of Squirrel Cage Rotor of Induction Motor)

  • 이진석;이하정;박관수
    • 한국자기학회지
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    • 제26권2호
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    • pp.67-69
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    • 2016
  • 최근 중국의 희토류 자석 생산 독점과 수출 규제로 인해 희토류 자석의 가격이 급등하였다. 이러한 경제적인 문제로 인해, 희토류 자석을 사용하지 않는 유도전동기의 연구가 활발히 이루어지고 있다. 이 논문에서는 유도전동기의 토크를 계산하고, 농형 유도전동기의 회전자 단면적과 저항에 관한 상관관계를 연구하였다. 또한, 회전자의 단면적이 같고 형상이 다를 경우, 회전자의 누설 리액턴스와 토크의 상관관계에 대해 분석하여 농형 유도전동기를 개선하고자 하였다.

파라미터 해석을 통한 차량 성능 예측 기법 연구 (Study on the Prediction Technique of Vehicle Performance Using Parameter Analysis)

  • 김기창;김찬묵;김진택
    • 한국소음진동공학회논문집
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    • 제20권11호
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    • pp.995-1000
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    • 2010
  • With the development of the auto industry, the automobile manufacturers demand to shorten development period and reduce the cost. Compared with the traditional method, applying the virtual prototype is more economical. This paper presents a method for parameters sensitivity analysis and optimizing the performance of vehicle noise and vibration. The existing design processes were repeatedly analyzed with a focus on vehicle performance to decide the design parameters of dimension, thickness, mounting type of body and chassis systems in the vehicle development period. This paper describes the prediction technique of vehicle performance using L18 orthogonal array layout, quality deviation analysis and parameter sensitivity analysis for robust design. This paper analyzed the performance correlation equation through the frequency and sensitivity database according to a design factor change. The new concept is that the performance prediction is possible without repeated activities of test and analysis. This paper described the parameter analysis applications such as bush dynamic stiffness and bush void direction of rear suspension. Design engineer could efficiently decide the design variable using parameter analysis database in early design stage. These improvements can reduce man hour and test development period as well as to achieve stable NVH performance.

A Comparative Study on the Fashion Style of Multivocal Value Groups since 1990s

  • Yang, Soo-Hi;Yang, Hee-Young
    • The International Journal of Costume Culture
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    • 제5권3호
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    • pp.184-203
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    • 2002
  • This study considers the fashion as an expressive object of mental value system in order to understand muitivocal value groups. Because the external behavior aspects and internal values of muitivocal value groups are getting more ambiguous in these days. This purposes of this study are as follows; first, this paper examines diversely how these groups affect modern fashion through analysis multivocal value groups after 1990s, and makes clear that various social, cultural, and economical values are important factors for changing symbolic standard connected with fashion. Second, it aims at expanding the positive recognition of the conflicts that exist among various values, and aesthetical recognition that overcome the discrepancy and such conflicts. For this aim, this paper analyzes the social and cultural aspects, aesthetic taste, life style of such groups focusing on Dink, Yiffie, Yettie, Bobos. We examine these groups' characteristics and their effect on modern fashion by categorizing them into Snob Look, Vintage Fashion, Unbalance Fashion, and Caports Look. This paper conducts the previous literature review and the practical analysis on periodical publications and Internet websites concerning fashion. Consequently, this kind of study is useful for providing a theoretical background that would explain the multilateralism in fashion, with uncertain in useful and culture, and changing the obvious confusion to another dimension of order.

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그린라운드와 에너지 정책 (Green Round and Energy Policy)

  • 도유봉
    • 기술사
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    • 제28권4호
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    • pp.14-20
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    • 1995
  • Discourses on global environment are not only limited to the matter of simple environmen-tal protection but also going to an imperative that every country should take the environ-mental aspects into more consideration, and if necessary even proceed to modify its own strategies for economic growth. It is because scores of existing International conventions and agreements on environmental caused tend to combine the environmental issues with trade sanctions and financial assistances in order to ensure a mandatory power in pushing themselves through on a global dimension. Particularly noteworthy is the so -called Green Round(GR) which substantially associates the Issues of environmental protection with some sanctions in international trade, its rationale is quite simple. The differentiated production costs rising from the difference in environmental standards among different countries may affect national competitiveness in in-ternational trade, therefore a need does exist to countervail this difference. In reality, however, severe dissention seems to have been exposed between the developed and developing countries around this matter, because national interests and priorities in national goals considerably differ among respective countries. Greenhouse gases such as carbon dioxide which caused global warming are mostly released from the combustion of fossil fuels. The perfect removal of released $CO_{2}$ is impossible with existing technologies, and moreover, it's not payable in economical terms. Therefore it will be more effective and desirable to make more efforts to prevent the release of the $CO_{2}$ it- self through energy conservation involving the development and promotion of clean and high-efficient energy technologies and energy sources, and the development and promotion of new & renewable energy resources, and so on. One of important national tasks In our country is to establish an Energy Policy consider-ing environmental impacts since Korea depends most of its energy consumption on the fossil fuels such as oil and coal.

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전도 냉각형 10kJ 고온 초전도 에너지 저장장치의 열 부하 특성 해석 (Heat load characteristic analysis of conduction cooled 10kJ HTS SMES)

  • 김광민;김아롱;김진근;박해용;박민원;유인근;김석호;심기덕
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.2219_2220
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    • 2009
  • The characteristics of the Superconducting Magnetic Energy Storage (SMES) system are faster response, longer life time, more economical, and environment friendly than other Uninterruptible Power Supply (UPS) using battery. Fast charge and discharge time of SMES system can provide powerful performance of improving power quality in the grid. In order to demonstrate the effectiveness of SMES, the authors make a 10kJ SMES system for connection with RTDS (Real Time Digital Simulator). Because the characteristics of superconducting magnet are very important in SMES system, the necessary items such as thermal characteristic, mechanical stress and protection circuit should be considered. In this paper, the authors experimented thermal characteristics of the 10kJ SMES system. The experiment was accomplished using a simulation coils made of aluminium. It has same dimension of the 10kJ class HTS SMES coil. The coil was cooled with GM (Gifford -McMahon) cryocooler through the OFHC (Oxgen Free High thermal Conductivity) conduction bar. The test results of cool down and heat loads characteristics of the simulation coils are described in detail.

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역지붕 녹화옥상시스템[KICT-GRS2004]의 우수유출 특성에 관한 실험적 연구 (A Experimental Study on Effluence Characteristic of the Rainfall in the IRMA Green Roof System of KICT)

  • 장대희;김현수;이건호;문수영
    • KIEAE Journal
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    • 제5권2호
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    • pp.11-18
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    • 2005
  • The Purpose of this study is development and analysis of Effluence Characteristic of the Rainfall in the IRMA Green Roof System(developed in KICT) Plus 50 program is an internal research project at KICT(Korean Institute of Construction Technology) which has it as an object ; to lengthen the building's life 50-year or more and reduce energy conception 50% than present. Green roof system is one of the most important theme in the Plus 50 program. Generally, a Green Roof System has a positive effect on the thermal conductivity in winter, the micro cooling effect on building and city by evaporation in summer, the flood-control effect by runoff-reduction or the treated rainwater-quality of green roof system and so on. However, inspection of the physical effect of green roof system does not consider in Korea. Above all, long-term monitoring and a whole observation of green roof system is needed to probate the effect. So a new experimental method could be tried in this research, which is never attempted in Korea. The measurement by a bucket with a great volume, 1L, gives a new dimension of measuring green roof effect to measure the permanent running flood from a wide roof. This offers a reasonable result on a long-term measuring of a running water. Additionally, the thermal behavior of the IRMA(Insulated Roof Membrane Assembly), known in the western europe as a reasonable solution at green roof system by economical benefits and easy construction, would be experimented.

주거환경개선지구 다가구주택 환경 개선 방안에 관한 임차인 요구 조사연구 (A Proposal to improve environment for multi-family housing residence in amelioration area)

  • 황선혜;김다해;안창헌;이연숙
    • 한국주거학회:학술대회논문집
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    • 한국주거학회 2008년 추계학술발표대회 논문집
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    • pp.140-143
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    • 2008
  • As the number of family living alone is expected to soar due to a change in socio-demographics like divorce, more middle-aged women returning to work, homes become smaller and so on. In addition to in 2020 these people will be increase so that 85 percent of the Koreans compose elderly living alone who is over 65. This study aims at developing a sharing-typed elderly people-centered rental model which is accessible in the community integration dimension as an alternative and finding out theirconscious, their need about residence. and we need to check about their major requirements on improvement step by step. so that we suggest the desirable way on the existing multi house. The model provides benefits in the social, economical and pragmatic dimensions as the families living alone get together and living with others, Particularly, as a residence model which reduces a psychological loneliness and at the same time enables the elderly to continue to live a life in the community while they live together with other people, this model could be a strategy which supports the "Aging in Place." This study is in progress via small group workshop which debate gradually about special subject with similar group member. So we can find the residence's preference on living environment in various condition and the member can imagine freely on their future living arrangement by giving the various informations which can be proceed in future. The workshop proceed three times. at the first workshop, we're check their living environment and satisfaction level. and second time we give the knowledge about shared-type rental house then discuss about the model. and last time we're listen to the residence's opinion.

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