• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.19-22
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• 2002

The importance of accurate dose delivery in radiotherapy is well documented. Studies have shown that a mere 5% deviation of the prescribed dose can produce an undesirable treatment outcome. Uncertainties in the dose delivery can arise at different stages of the radiotherapy process. Therefore, a good quality assurance programme will ensure the best possible results and consistency of the radiotherapeutic treatment. Quality assurance in any radiotherapy department involves the responsibility of a multi-disciplinary team of radiation oncologists, medical physicists and radiation technologists. This paper will focus on the physical and technical aspects of QA. The organizational structure and responsibility of the physics QA team is outlined and also included the types and frequencies of QA checks. For a QA program to be effective, action levels should be clearly defined and understood by all staff concerned. Data of the Singapore National Cancer Centre's participation over the last ten years with the IAEA / WHO Postal TLD Dose Inter-comparison programme is presented. The data obtained were within the international criteria. For a QA program to be successfully implemented, there must be a commitment by management to provide adequate staff, test equipment, machine time as well as continual training and education. This is in addition to the positive attitudes of all the staff. A quality audit is also necessary to serve as a check and balance to ensure that the QA is in order.

• Structural Engineering and Mechanics
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• 제50권6호
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• pp.797-816
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• 2014

Cooling tower is analyzed as an assembly of layered nonlinear shell elements. Geometric representation of the shell is enabled through layered nonlinear shell elements to define the different layers of reinforcements and concrete by considering the material nonlinearity of each layer for the cooling tower shell. Modal analysis using Ritz vector analysis and nonlinear time history analysis by direct integration method have been carried out to study the effects of the inclination of the supporting columns of the cooling tower shell on its dynamic characteristics. The cooling tower is supported by I-type columns and ${\Lambda}$-type columns supports having the different inclination angles. Relevant comparisons of the dynamic response of the structural system at the base level (at the junction of the column and shell), throat level and at the top of the tower have been made. Dynamic response of the cooling tower is found to be significantly sensitive to the change of the inclination of the supporting columns. It is also found that the stiffness of the structure system increases with increase in inclination angle of the supporting columns, resulting in decrease of the period of the structural system. The participation of the stiffness of the tower in structural response of the cooling tower is fund to be dependent of the change in the inclination angle and even in the types of the supporting columns.

• 플랜트 저널
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• 제7권3호
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• pp.42-47
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• 2011

One of domestic power generation companies, Korea East-West Power Corporation(EWP) had no performance in overseas business just two short years ago. However, EWP has accomplished breakthrough results with the profit of KRW 17.8 billion in 2010, only overseas business part. With overseas power plant growing fast, there is a possibility that EWP may face the limitation of sustainable growth with the current low income structure, which is mainly focused on commissioning and power plant management. Accordingly, this study was made on overseas biomass plant business participation plan through the establishment of joint venture. The characteristics of a joint venture establishment was searched, choosing business partner; the ideas of how to organize a joint venture was drawn, what the role of each partner in joint venture is, and what proper capital share is; and chose business field, considering changing global energy mix, renewable energy market scale, and growth prospects. Considering government policy for renewable energy vitalization and renewable energy market share, We chose the European union as a market to which our business entered.

• Fashion, Industry and Education
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• 제14권1호
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• pp.59-68
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• 2016

This paper identified the source of inspiration to cooperatively design a fashion collection from US undergraduate clothing design students and addressed how to implement team-based learning strategy to conceptual clothing design in class. Data was collected from the total of 51 students in a senior clothing design course at a large 4-year university in the US. The assigned project for this class was to develop a group collection under a same theme. Each student worked with his/her team member(s) to create an outfit and the entire class worked as a group to create a cohesive collection. The study showed that the sources of inspiration for the themes/concepts came from 11categories: historic era/old Hollywood glamour, shape/line/structure/architectural, fairy tales movies, nature/abstract, circus/mysterious, occasion/place, object, designer/artist, futuristic, culture, and various movies. To implement cooperative learning strategies in the clothing design class, a total of five class presentation/discussion sessions were held for theme/concept decision, fabric decision, design decision, test garment evaluation and design modification, and final products. Throughout the design process, team-based learning strategy promoted students' engagement and participation and inspired their critical thinking skills for making decisions within a team.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2006년도 정기학술발표대회 논문집
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• pp.378-383
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• 2006

본 연구에서는 최근 활성화 되고 있는 BTL 사업의 재원조달 방법을 다양화함과 동시에 중소건설사의 민간투자사업 참여활성화를 위하여 자산유동화증권 제도의 도입을 검토하고 도입에 따른 효과와 장단점 등을 사례에 대한 민감도분석 등을 통하여 제시하고자 하였다. 이를 위하여 두 가지 형태의 ABS 도입 구조를 제안하고 절차를 제시하였으며 도입에 따른 효과 분석을 위하여 학교시설 신축 사업을 대상으로 조달금리 변화에 따른 사업자의 수익률 변화와 정부의 정부지급금 변화를 분석함으로서 도입의 효과를 계량화 하고자하였으며 ABS 제도의 도입에 필요한 향후 개선 과제를 제시하였다.

• 한국인구학
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• 제21권1호
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• pp.5-41
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• 1998

과거 30년 동안 우리 나라의 인구는 양적 증가가 둔화된 대신 질적(교육)수준이 향상되는 전형적인 인구변천과정을 겪어 왔다. 본 논문에서는 노동공급의 변동을 양적 측면과 질적(교육수준)측면의 두 요인으로 나누어 과거 30년간 우리 나라 경제성장의 고용흡수력을 분해 측정하였다. 그리고 인구구조(성, 나이, 학력)와 경제활동률을 전망한 다음 노동공급의 양적 측면과 질적 측면에 대한 전망을 토대로 하여 향후 우리 나라의 성장잠재력을 전망하였다. 그 결과 우리 나라의 노동공급은 양적 구조에서 질적 구조로 변화하고 있지만 양적 감소요인을 질적 증가요인이 충분히 상쇄하지 못함으로써 잠재성장률이 현저히 둔화될 것으로 전망된다.

• 한국전산구조공학회논문집
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• 제21권2호
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• pp.127-133
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• 2008

본 연구는 일반 철골구조물에서 사용되는 구조용 프리캐스트 콘크리트 외부벽판과 연결부재로 인하여 건물 전체의 내진성능을 조사하였고, 벽판의 높이 변화에 따른 건물 전체의 횡방향 강성 변화량을 파악하였다. 외부벽판과 연결부재를 구조 부재로 간주할 경우 수동형 제진장치와 같이 지진에너지를 소산할 뿐 아니라 추가로 전체 건물의 횡방향 강성을 제공하는 것을 확인하였다. 이력거동 성능을 가진 연결부재를 비선형 유한요소해석 프로그램인 ABAQUS를 이용하여 조사한 결과, 건물의 내진성능 향상에 연결부재가 가장 중요한 역할을 하는 것으로 확인되었다.

• 디지털융복합연구
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• 제8권2호
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• pp.29-42
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• 2010

그동안 정부는 R&D투자의 성과 제고를 위해 R&D 시스템 내의 구조와 프로세스를 개선하는데 많은 노력을 기울여 왔다. 그러나 대내외 기술 환경이 급변하고 투자규모가 지속적으로 증가함에 따라, 정부 R&D 또한 다양한 외부자원의 활용을 통해서 규모의 수확을 이룰 수 있는 혁신적인 접근방법이 필요한 상황이다. 이러한 관점에서 '개방형 혁신'은 외부자원에 대한 흡수능력 (absorptive capacity)을 향상시키고, 다양한 혁신주체 간 협력과 참여를 제고시킬 수 있다는 점에서 '정부실패'의 가능성을 최소화 시킬 수 있다. 본 논문은 정부 R&D투자의 성과에 관한 선행연구와 정부정책을 평가하고, 개방형 혁신이 정부 R&D투자의 성과 제고에 기여할 수 있는 연계성을 보여주고 있다.

• 복식
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• 제60권10호
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• pp.88-99
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• 2010

The purpose of this study is to express visual and functional diversity through modifiable design, and to suggest a methodological model. With this view, this study was aimed to departmentalize the case of knitwear in modifiable design of clothes and propose the possibility of variable knit fashion through make the most of knit's characteristics. Four wearable physical clothes using the most of flexible knits' characteristics were made for this study based on the modifiable design on the expressive tendency and analysis of plasticity. The following results were obtained. First, as modifiable knit design can create effects of several dresses in visual aspect and functional aspect, so it has practicality and functionality. Because modifiable clothes required wearer's participation, this have amusement that give enjoyment and freshness to wearer. Second, in mode of wearing, flexibility of knit is suitable character to open & close and change of wearing position. In manipulation, a prearranged plan for line of clothes and good choice of subsidiary materials are important. Third, the characteristics of knits allow using and mixing with different pattern and materials on the two sides of the same cloths except for the some of the parts. Moreover, there is no unraveled thread on the part of knits margin against woven, so it has the broad applicable range for the changeable design. Finally, the form and function, a prearranged plan for modifiable design of clothes have all contributed in creating new structure and patterns in design.

• Steel and Composite Structures
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• 제4권6호
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• pp.437-452
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• 2004

A simplified seismic design procedure for steel structures with buckling-restrained braces (BRB) was proposed based on the energy balance concept and the equal energy assumption. The input seismic energy was estimated from a design spectrum, and the elastic and hysteretic energy were computed using energy balance concept. The size of braces was determined so that the hysteretic energy demand was equal to the hysteretic energy dissipated by the BRB. The validity of using equivalent single-degree-of-freedom systems to estimate seismic input and hysteretic energy demand in multi story structures with BRB was investigated through time-history analysis. The story-wise distribution pattern of hysteretic energy demands was also obtained and was applied in the design process. According to analysis results, the maximum displacements of the 3-story structure designed in accordance with the proposed procedure generally coincided with the target displacements on the conservative side. The maximum displacements of the 6- and 8-story structures, however, turned out to be somewhat smaller than the target values due to the participation of higher vibration modes.