• 동력기계공학회지
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• 제9권3호
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• pp.39-43
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• 2005

Among many other alternative energy resources, small scale hydropower has been brought into attention as a reliable source of energy today, which had been relatively neglected since 1960s. Present low head of Francis turbines and small scale hydroturbines, however, have limitations in the minimum required head and flow rate for efficient operation. This study attempts to develope the Francis turbine which is expected to run efficiently even in very low head and small flow rate, so that the limitations on the conventional small scale hydropower could alleviated and competition with other alternative energy sources in the changable design conditions could attained. The Francis turbine of a new concept was designed based on changable design conditions, hydrodynamics and theory of power transmission. The result of the study shows that two stages runner is more efficient, cheaper in construction, faster responding, and easier maintaining than single stage runner of Francis turbine

• Fashion, Industry and Education
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• 제16권2호
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• pp.40-51
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• 2018

Sustainability is an important topic within a variety of design areas, including fashion. The 'fast fashion' behavior of consumers is one of the big challenges that sustainable living faces. For the fashion industry, sustainability can be seen as a regulating ethos for higher quality and longer-lasting products, which I argue as embodying an intersection between sustainability and luxury. This study establishes a conceptual model for 'sustainable luxury' that can be implemented as a guide in the fashion design industry and education field. This paper will focus particularly on craft-based fashion within the industry. Through conceptual analysis and case studies, I analyze sustainable luxury through the scope of Soper's (2007) 'alternative hedonism', linking hedonic and selfidentity values as a foundation for the acceptance of and continued drive toward more sustainable luxury products. Unlike other studies which only emphasize the ecological and environmental aspects of sustainability, viz. green/eco design, this study explores sustainability as balanced with its four dimensions: environmental, economic, social, and cultural. Case studies will exemplify this redefined notion of sustainable luxury.

• 한국환경복원기술학회지
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• 제21권2호
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• pp.77-85
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• 2018

The intensive habitats loss of natural organisms as a consequence of anthropogenic activities has lead to the use of alternative habitats for species conservation. We reviewed the current status of alternative habitats and suggest the improvement of alternative habitats. Most of alternative habitats regarded in this study are not following the pre-arranged consultation at environmental impact assessment. These alternative habitats are rendered useless due to the insufficient consideration of ecological characteristics of species and lack of detailed plans. A number of alternative habitats are influenced by disturbance such as environmental pollution and construction. Post-monitoring of alternative habitats are needed to estimate immigration rate of species. Post management is also needed to assess the status of population stability. Overall, low effectiveness of alternative habitats is presented in this study. According to the status survey, methods for improvement of alternative habitats are required such as detailed guidelines, establishment of post-monitoring system, improvement of habitat restoration techniques, and guidelines for management and operation of alternative habitats.

• Nuclear Engineering and Technology
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• 제28권5호
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• pp.440-451
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• 1996

With emphasis on safety, this study addresses for better design condition for the cooling system in a wet-type interim spent fuel storage facility, using a probabilistic safety assessment method. To incorporate the design renovation into the design phase, a simple approach is proposed. By taking the cooling system of a reference design, a fault tree analysis was performed to identify the weak point of the considered system, and then basic factors for design renovation were defined. A total of 21 design alternatives were selected through the combination of the basic factors. Finally, the optimum design alternative for the cooling system is derived by means of the cost and effect analysis based on the estimated cost, system reliability and assumed probabilistic safety criteria. With the assumption that the failure frequency of at-reactor spent fuel cooling system compiles with probabilistic safety criteria for the interim spent fuel cooling system, it was shown that the optimum alternative should have l00% cooling loop redundancy with one pump per cooling loop and a cleanup system installed separately from the main loop. Furthermore, it also should be classified into safety system. The result of this study can be used as a useful basis to identify factors of safety concern and to establish design requirements in the future. The method also can be applied for other nuclear facilities.

• International Journal of Precision Engineering and Manufacturing
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• 제7권4호
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• pp.40-46
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• 2006

The market of programmable implantable pumps has bound to a monopolistic situation, inducing high device costs, thus making them inaccessible to most patients. Micro-mechanical and medical innovations allow improved performances by reducing the dimensions. This affects the consumption and weight, and, by reducing the number of parts, the cost is also affected. This paper presents the procedure followed to design an innovative implantable drug delivery system. This drug delivery system consists of a low flow pump which shall be implanted in the human body to relieve pain. In comparison to classical known solutions, this pump presents many advantages of high interest in both medical and mechanical terms. The first section of the article describes the specifications which would characterize a perfect delivery system from every points of view. This concerns shape, medication, flow, autonomy, biocompatibility, security and sterilization ability. Afterwards, an overview of existing systems is proposed in a decisional tree. Positive displacement motorized pumps are classified into three main groups: the continuous movement group, the fractioned translation group and the alternative movement group. These systems are described and the different problems which are specific to these mechanisms are presented. Since none of them fully satisfy the specifications, an innovation is justified.. The decisional tree is therefore extended by adding new principles: fractioned refilling and fractioned injection within the fractioned translation movement group, spider guiding system within the alternative translation movement group, rotational bearing guided device and notch hinge guided device in the alternative rotation movement group.

• 한국재난정보학회 논문집
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• 제9권2호
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• pp.164-177
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• 2013

2010년부터 2013년까지 낙찰자 선정방식이 설계적합 최저가방식, 종합평가방식(입찰가격 조정, 설계점수조정, 가중치기준), 확정금액 최상 설계방식으로 변경되었다. 따라서 이 연구는 국내에서 시행된 변경된 방식에 의한 토목부분 턴키 대안입찰공사의 발주현황, 건수, 수주실적, 낙찰률 범위, 공종별 발주기관별 수주실적, 가중치 낙찰자 수주실적 등의 분석을 통해 국내 낙찰자 결정방식이 건설산업에 미치는 영향, 심의 발주방식 및 운영상의 문제점을 분석하여 제시하였다.

• Structural Engineering and Mechanics
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• 제51권6호
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• pp.909-922
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• 2014

In this paper, we present an alternative seismic design strategy for cable stayed bridges with concrete pylons when subjected to strong ground motions. The comparison of conventional seismic design using supplemental dampers (strategy A) and the new strategy using nonlinear seismic design of pylon columns (strategy B) is exemplified by one typical medium span cable stayed bridge subjected to strong ground motions from 1999 Taiwan Chi-Chi earthquake and 2008 China Wenchuan earthquake. We first conducted the optimization of damper parameters according to strategy A in response to the distinct features that strong ground motions contain. And then we adopted strategy B to carry out seismic analysis by introducing the elastic-plastic elements that allowing plasticity development in the pylon columns. The numerical results show that via strategy A, the earthquake induced structural responses can be kept in the desired range provided with the proper damping parameters, however, the extra cost of unusual dampers will be inevitable. For strategy B, the pylon columns may not remain elastic and certain plasticity developed, but the seismic responses of the foundation will be greatly decreased, meanwhile, the displacement at the top of pylon seems to be not affected much by the yielding of pylon columns, which indicates the pylon nonlinear design can be an alternative design strategy when strong ground motions have to be considered for the bridge.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.662-665
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• 2008

본 연구는 기존 시공단계 중심의 4D CAD 활용체계를 설계단계까지 확장하여 도로의 최적 설계업무 지원을 위한 4D CAD 기능을 개발하는 것이 목적이다. 도로설계 지원 기능으로는 도로선형에 의한 토공 시뮬레이션, 대안 노선 선정 시뮬레이션 및 구조물 타입 선정 시뮬레이션 기능을 제안하고 있다. 이러한 VR 시뮬레이션 기능을 통해 도로선형지정에 의한 노선 및 토공 상태의 시각적 확인이 가능하다. 또한 대안 노선의 가상적인 모의 배치를 수행함으로써 최적의 대안 노선을 선정할 수 있다. 이와 함께 구조물의 다양한 모델을 지형에 배치하여 주위 환경에 적합한 구조물 형식을 결정할 수 있다. 본 연구에서 제시된 기능은 도로설계의 효율적인 지원을 위해 가상적인 모델 기반의 의사결정도구를 제공한다. 따라서 본 연구에서 구현된 기능 인터페이스를 통해 도로 설계업무의 효율성을 기대할 수 있다.

• The Journal of Asian Finance, Economics and Business
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• 제5권2호
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• pp.139-149
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• 2018

In the contemporary era of smart tourism, travelers face more accommodation options than ever before. The rapid expansions of alternative accommodation sector are partially owing to the growth of electronic commerce and the rise of online intermediary platforms. Online travel agencies serve as a critical distribution channel for tourism sectors, and the significance is further increased for small and micro entrepreneurs whose direct communication channels are scarce. Considering the holistic process of customer experience started with a third-party online intermediary, this study explores basic and extended attributes of small and medium-sized alternative accommodation where the comparative value is created. In order to achieve the objective, a research design was developed to synthesize the qualitative evidence. The synthesis encompasses both theoretical and practical perspectives, from a systematic review and opinions of academic professionals to an in-depth interview with an industry expert and the current practices of online travel agencies. This study suggests that the sources of value creation for alternative accommodation are not always consistent with those of the traditional. Accounting for the temporal and spatial dynamics in customer experience, the findings of this study provide insights on the comparative value of alternative accommodation, to both academic and industry audiences.

• KIEAE Journal
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• 제9권5호
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• pp.21-28
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• 2009

In apartment buildings, casualties, especially fatalities have occurred in balcony areas in fires if residents fail to escape to the main entrance. Potential consequences of a particular infrequent event should be considered. In attempting to design apartment buildings for fire safety, alternative escape methods such as vertical penetration could be considered. The purpose of this study is to investigate present building regulations regarding apartment buildings and examine pros and cons of the current escape method and alternative escape methods. Focus group interview was conducted to discuss problems of fire escape methods. In addition, questionnaires were distributed to field professionals working in architecture, construction and related industries. Among 500 questionnaires distributed, 192 questionnaires were collected. Usable 162 questionnaires were analyzed using SPSS 15. Regarding alternative fire escape methods, several concerns were mentioned. Safety, privacy, security, effectiveness of escape, water proof problems were raised. Based on the opinions, vertical penetration between apartment unit appeared more safe, secure, effective than horizontal penetration. However, both methods have its own pros and cons under specific contexts. Alternative escape methods need be considered for a selective options for residents in case of fire.