• 전기학회논문지
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• 제65권2호
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• pp.264-268
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• 2016

Recently, various energy efficiency optimization activities are ongoing globally by integrating conventional grids with ICT (Information and Communication Technology). In this sense, various smart grid projects, which power suppliers and consumers exchange useful informations bilaterally in real time, have been being carried out. The electric vehicle diffusion program is one of the projects and it has been spotlighted because it could resolve green gas problem, fuel economy and tightening environmental regulations. In this paper, the economics of V2G system which consists of electric vehicles and the charging infrastructure is evaluated comparing electric vehicles for V2G with common electric vehicles. Additional benefits of V2G are analyzed in the viewpoint of load leveling, frequency regulation and operation reserve. To find this benefit, electricity sales is modeled mathematically considering depth of discharge, maximum capacity reduction, etc. Benefit and cost analysis methods with the modeling are proposed to decide whether the introduction of V2G systems. Additionally, the methods will contribute to derive the future production and the unit cost of electric vehicle and battery and to get the technical and economic analysis.

• KDI Journal of Economic Policy
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• 제14권1호
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• pp.61-87
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• 1992

인위적(人爲的)인 배기(排氣)가스의 배출(排出)이 급증함(急增)함에 따라 나타날 것으로 예상되는 지구온난화(地球溫暖化)를 방지하기 위해서는 에너지 소비절약과 화석연료의 대체를 통해서 $CO_2$ 배출량을 축소시키는 노력이 필요하다. 그런데 배기(排氣)가스의 배출(排出)을 억제하는 데에는 많은 비용(費用)이 들 것이므로 배출억제수단(排出抑制手段)으로는 비용효율적(費用效率的)인 경제적 수단이 동원될 가능성이 높다. 본고(本稿)는 온난화(溫暖化) 방지수단(防止手段)으로 경제적 수단이 동원될 경우를 상정하여 기후변화 방지의 비용-수익분석을 통하여 최적 배출억제규모를 시산하고 있다. $CO_2$ 농축도가 현재 수준보다 배증(倍增)하는 경우 평균기온이 약 $3^{\circ}C$ 상승한다고 가정하고, $3^{\circ}C$ 상승이 유발하는 경제적 피해가 GNP의 0.25%, 1%, 2%에 이르는 세가지 시나리오를 상정하여 $CO_2$ 배출량 감축의 수익을 시산하였다. 단순성장(單純成長)-기후변화(氣候變化) 모형(模型)에 기초하여 시산(試算)한 결과(結果)에 의하면 우리나라의 경우 1990년을 기준으로 할 때 최적 $CO_2$ 배출량 감축규모는 피라미터값에 따라 현재수준의 2~15% 정도에 이르는 것으로 나타났다. 그리고 배출감축시점을 지연시키는 경우 감축규모(減縮規模)는 현재시점을 기준으로 했을 때보다 커질 수도 있고 작아질 수도 있으나, 향후 기후관련 기술진보나 화석연료 사용의 효율성이 높아지는 경우 최적 감축규모는 감축시점(減縮時點)이 연기됨에 따라 증가할 것으로 예상된다. 본고(本稿)에서는 또한 최적배출규모가 주어졌을 때 실제로 배출규모를 감축하는 방법으로 동원될 수 있는 탄소세(炭素稅)와 배출권(排出權) 거래제(去來制)의 경제적 특징과 장 단점도 논의하고 있다. 이 두가지 수단은 최적조건이 동일한 성질을 갖고 있으므로 비용효율면에서는 동일한 효과를 갖고 있으나 실제운용에 있어서는 서로 다른 장 단점을 지니고 있다.

• 한국건설관리학회논문집
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• 제12권4호
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• pp.88-96
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• 2011

공정(일정)관리는 가장 기본적인 건설업무기능 중 하나이며, 수십 년 전부터 네트워크 기반의 과학적 관리기법 (CPM, LSM, Simulation 등)이 개발되어 활용되어 왔다. 다양한 네트워크 관리기법과 더불어 공정관리 프로세스에 있어서도 공정표의 위계 및 표준 등의 실무절차가 일반적으로 활용되고 있다. 그럼에도 불구하고, 각 건설조직 또는 각 프로젝트 특성에 따라 공정관리의 실무적인 세부기법들은 다소 다르게 적용되며, 이러한 세부기법의 선택적용은 발주방식, 경영전략, 기술전략, 그리고 현장여건 등을 포함하는 포괄적인 프로젝트 환경에 의하여 영향을 받게 된다. 이러한 맥락에서, 본 연구에서는 우리나라 종합건설업의 기업차원 공정관리 방법을 조사함으로써 현황파악과 함께 변화추세를 분석하였다. 공정관리는 과학적인 '공정관리 기법' 활용과 더불어 포괄적인 '공정업무 체계'가 함께 운영되어야 하며, 본 조사는 후자인 공정관리 체계 관점에서 사업관리 기술 변화를 파악하는데 중점을 두었다. 연구방법으로는, 우선 공정관리의 실무기능을 분류 정의하였으며, 이를 바탕으로 설문을 작성하여 각 기업의 관리방법을 조사하였고, 마지막으로 설문응답을 분석을 통하여 시사점을 도출하였다. 총 45개 종합건설기업의 응답결과를 기업규모, 매출특성 등을 기준으로 분류하여 분석하였다.

• 한국자동차공학회논문집
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• 제17권2호
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• pp.67-74
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• 2009

Injection molding have been used for manufacturing various fields of automotive interior trims for years. The demands on the injection molding technique are grown with the further development of the automobile technique and the design presentations for cost reduction and environment-friendly. This paper shows that multi-component injection conditions are different from general injection, also shows how to optimize part design and mold design and how to manufacturing through the efficient use of multi-component injection in development process using core back system. To fulfill this purpose, all influential process parameters related to the quality of automobile parts were analyzed in terms of the correlation between them. Base on that, a innovative process will be developed by injection engineers to implement it in practice.

• 한국안전학회지
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• 제14권2호
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• pp.163-169
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• 1999

Safety education should not only prevent workers from industrial accidents but also contribute to improve the productivity of manufacturing plants or construction sites. In practice this do not happen because workers do not realize the importance of safety education. This study aims to suggest a methodology to improve safety education of construction sites by surveying conditions of safety education and the safety consciousness of workers and engineers. The results showed that most education except regular educations were nominally carried out. Lectures and audio-visual education were mainly used as educational methods. After trainees attended the education session they completed a written survey, the most dissatisfied factor about safety education was education circumstances, of which rate was around 36%. The proportion of construction engineers who thought that safety management was contributable to cost reduction was 35%, to construction period 20%, and to quality enhancement 48%. Based on these results, this research pointed out the need to review training manuals, the development of educational programs, improvement of educational facilities to improve safety education of construction sites, and finally to discussed these issues.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 2부
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• pp.85-88
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• 2011

우리나라의 주택환경에 적합하게 개발된 MRS공법을 기본으로 하여, 현장의 여건에 맞추어 4층1절 기둥을 활용함으로써 원가절감, 공기단축 등의 유형적 성과와 함께 현장의 작업환경 개선을 통한 시공성 향상이라는 무형의 성과를 함께 얻을 수 있었다.

• 한국기계가공학회지
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• 제11권5호
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• pp.121-128
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• 2012

The optimization of cooling system parameters for designing injection mold is very important to acquire the highest part quality. In this paper, the integration of computer simulations of injection molding and Analysis of Variance(ANOVA) with orthogonal array was used as a design tool to optimize the cooling system parameters aimed at minimizing the part warpage. The design optimizer was applied to find the optimum levels of cooling system parameters for a dustpan. This optimization resulted in more uniform temperature distribution over the part and significant reduction of a part warpage, showing the capability of present method as an effective design tool. The whole optimization process was performed systematically in a proper number of cooling simulations. The design optimizer can be utilized effectively in the industry practice for designing mold cooling system with less cost and time.

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2005년도 춘계학술대회
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• pp.575-579
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• 2005

A Shared Services center (SSC) is created by removing common administrative functions from operational divisions within an organization, and centralizing the functions in a separate centre. SSC helps supporting organizations to focus on core activities and to achieve cost reduction as well as service quality enhancement. In contrast to many leading global companies which has been adopted SSCs from early 90's. A Company's HR SSC which has opened this year is the first genuine SSC practice in Korea. Centering on the case of A Company' s HR SSC implementation, we discussed on some practical implications for companies which has future plan to introduce a shared service center.

• Smart Structures and Systems
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• 제15권3호
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• pp.913-929
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• 2015

Hybrid simulation is increasingly being recognized as a powerful technique for laboratory testing. It offers the opportunity for global system evaluation of civil infrastructure systems subject to extreme dynamic loading, often with a significant reduction in time and cost. In this approach, a reference structure/system is partitioned into two or more substructures. The portion of the structural system designated as 'physical' or 'experimental' is tested in the laboratory, while other portions are replaced with a computational model. Many researchers have quite effectively used hybrid simulation (HS) and real-time hybrid simulation (RTHS) methods for examination and verification of existing and new design concepts and proposed structural systems or devices. This paper provides a detailed perspective of the enabling role that HS and RTHS methods have played in advancing the practice of earthquake engineering. Herein, our focus is on investigations related to earthquake engineering, those with CURATED data available in their entirety in the NEES Data Repository.

• The Journal of Asian Finance, Economics and Business
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• 제7권11호
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• pp.1041-1047
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• 2020

The intention of this paper is to give a better understanding about the implementation of sustainable manufacturing practice in the textile companies in Indonesia as one of the promising sectors in the manufacturing industry. The data was collected by taking a case study approach in one of the leading textile companies in Indonesia. Questionnaire and interview techniques were used to gather in-depth information about the implementation of a sustainable concept in the company. The result reveals that the extent of the implementation of Sustainable Manufacturing Practices (SMP) in the companies are at a level of moderate to high. From the three dimensions measured which are environment, economy, and social dimensions, the evaluation result shows good performance in terms of the implementation of sustainable concepts, like low level of gas emission, high percentage of renewable energy usage, cost reduction rate, high quality of life, etc. From this result, the authors then develop a sustainable manufacturing model in the wider coverage to be implemented not only in the textile industry but is expected to be implemented in manufacturing sectors as well. This model consists of at least seven basic archetypes which are divided into three dominant areas: technological innovation, economical, and social areas which aim to bring better performance in the manufacturing industry of Indonesia.