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      • KCI등재

        심재에 따른 진공단열패널의 특성 및 장기성능 평가

        김상명(Kim, Sang-Myung),프레드 에드먼드 보아포(Fred Edmond Boafo),진희(Kim, Jin-Hee),준태(Kim, Jun-Tae) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.1

        Recently to reduce energy consumption in the building sector, insulation regulation of the building envelope has been strengthened more and more. The strengthened regulation on insulation results in thicker building envelope and the thicker envelope makes inner space become narrow. One of the solutions to meet strengthened insulation regulation is using high efficient insulation for the building envelope. Vacuum Insulation Panel (VIP) is one of high efficient insulation which has 8~10 time lower thermal conductivity than existing insulations. By installing VIPs for building insulation, meeting the strict insulation regulation and maintaining large inner space are both possible. Generally, the lifetime of buildings is more than 50 years. However, the study on the long-term performance of VIPs is insufficient. In this paper, the performance and durability of VIPs were investigated. For the performance evaluation, VIPs from 5 companies were investigated. 4 types of VIPs based on fumed silica and 2 types of VIPs based on the glass fiber were tested. To analyze the performance of VIPs the thermal conductivity and inner pressure of VIPs were measured. For the analysis of the long-term performance for VIP, the accelerated aged test based on ISO standard was conducted. The accelerated test was done for 180 days and the test condition was kept at temperature of 50℃ and relative humidity of 70%. This paper compared the performance of VIP depending on the core material. Also, it showed the performance changed according to time and the estimated long-term performance of VIPs based on the accelerated aging test result was discussed. This paper would be a foundational research to help apply VIPs for the building industry.

      • KCI등재
      • 알루미늄 서브프레임용 Die-cast재의 기공 조건별 가공재와의 MIG용접조건 실험연구

        김상명(Sang Myung Kim),조철환(Chul Hwan Cho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4

        There are difficulties in the recent automotive market because of world economic crisis. Automotive industries are demanding low-cost car-production and fuel efficiency improvement with light weight materials. The trend in aluminum application for sub-frame has been focused on parts unification, flexible feature and low-cost production. This research proposes the experimental welding development for the aluminum vacuum-diecast and wrought material by controlling pulse wave with porosity diminishing effect.

      • 건물결합방식에 따른 진공단열패널 벽체 열교분석

        김상명(Sang Myung Kim),Fred Edmond Boafo,민다혜(Da Hye Min),진희(Jin Hee Kim),준태(Jun Tae Kim) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6

        Global efforts to reduce energy consumption in buildings has continuously increased. In advanced countries, building energy use has reached almost 40% of total energy consumption. In the case of Korea, it accounts for 25% of domestic energy consumption. The Korean government has set goals to meet passive house standard by 2015 and zero-energy building construction by 2025. High efficiency insulation such as vacuum insulation panel (VIP) is required to satisfy such regulation. VIP is a highly efficient insulation which has higher insulation performance, that is about 7~8 times better than conventional insulation. Using VIP reduces insulation thickness and creates wider effective inner space. However, VIP is a non-homogenous insulation material composed of materials which have different thermal conductivities. Consequently, when VIP is installed in building, various thermal bridges occur between core and envelope materials, airgap between panels, and between construction materials of building and VIP. In this study, analysis of thermal bridge effect caused by VIP installation method in building, using Physibel BISCO simulation program has been done. In all, four types of installation methods were studied. Application methods using wood lath, anchor, joiner and PVC-rail were simulated. The result from the simulation showed that, joiner type has the highest performance among VIP application methods.

      • KCI등재

        환기 유무에 따른 CIGS BIPV 커튼월 유닛의 성능 비교 분석

        김상명(Kim Sang-Myung),진희(Kim Jin-Hee),준태(Kim Jun-Tae) 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.2

        CIGS thin film solar cells are technically suitable for BIPV applications than regularly used crystalline silicon solar cells. Particularly, CIGS PV has lower temperature coefficient than crystalline silicon PV, thus decrease in power generation is lowered in CIGS PV. Moreover, CIGS PV can decrease shading loss when applied to the BIPV system, and the total annual power generation is higher than crystalline silicon. However, there are few studies on the installation factors affecting the performance of BIPV system with CIGS module. In this study, BIPV curtain wall unit with CIGS PV module was designed. To prevent increase of temperature of CIGS PV module by solar radiation, ventilation was considered at the backside of the unit. The thermal specification and electrical performance of CIGS PV of the ventilated unit was analyzed experimentally. Non-ventilated unit was also investigated and compared with ventilated unit. The results showed that the average CIGS temperature of the ventilated curtain wall unit as 6.8°C lower than non-ventilated type and the efficiency and power generation performance of ventilated CIGS PV on average was, respectively, about 6% and 5.8% higher than the non-ventilated type.

      • KCI등재

        태권도 품새 선수들의 성취목표성향, 심리기술, 운동 스트레스와 경쟁상태불안의 구조적 관계

        김상명 ( Sang-myung Kim ),상규 ( Sang-gyu Kim ) 한국체육대학교 체육과학연구소 2021 스포츠사이언스 Vol.39 No.2

        본 연구는 태권도 품새 선수들이 지각하는 성취목표성향, 심리기술, 운동스트레스와 경쟁상태불안 간의 구조적 관계를 검증하는 것이다. 이를 위해 태권도 품새 선수 302명에게 성취목표성향, 심리기술, 운동스트레스와 경쟁상태불안을 측정하였다. 수집된 자료는 SPSS 21.0프로그램을 활용하여 빈도분석, 기술통계분석, 신뢰도 분석, 상관분석을 실시하였고, Amos 21.0 프로그램을 활용하여 확인적 요인분석, 집중타당도 및 판별타당도 검증, 구조모형분석 그리고 경로계수의 상대적 효과를 검증하였다. 분석결과, 첫째, 자아성향은 심리기술에 유의한 영향을 미쳤다. 둘째, 과제성향은 심리기술에 유의한 영향을 미쳤다. 셋째, 심리기술은 운동스트레스에 유의한 영향을 미쳤다. 넷째, 심리기술은 경쟁상태불안에 유의한 영향을 미쳤다. 마지막으로 과제성향은 자아성향보다 심리기술에 대한 영향력이 큰 것으로 나타났다. 결과적으로 태권도 품새 선수들의 특성에 맞는 효과적인 심리기술을 바탕으로 훈련프로그램을 개발하고 그에 맞는 효율적인 지도가 이루어져야 할 것이다. The aim of this study is to investigate the structural relationship between achievement goal orientation, psychological skills, exercise stress and competitive state anxiety in Taekwondo Poomsae athletes. A total of 302 Taekwondo Poomsae athletes participated in this study. From these, From these, a demographic questionnaire, achievement goal orientation, psychological skills, exercise stress, and competitive state anxiety were measured. SPSS 21.0 was used to calculate the descriptive statistics, reliability and correlations. Amos 21.0 was utilized for confirmatory factor analysis, convergent validity, discriminant validity, structural equation modeling and relative effect analysis of path coefficient. The research result. First, ego-orientation was positively predictive of psychological skills. Second, task-orientation positively influenced psychological skill. Third, psychological skill positively affected exercise stress. Forth, psychological skill was positively related to competitive state anxiety. Lastly, there is a difference in the relative effects of ego-orientation and task-orientation on the psychological skills of the Taekwondo Poomsae athletes. These findings suggests, necessary to develop a training program based on effective psychological skills suitable for the characteristics of Taekwondo Poomsae players and to provide effective instruction accordingly.

      • KCI등재

        현금흐름패턴 방식을 사용한 기업수명주기와 조세회피와의 관계에 대한 연구

        김상명 ( Sang Myung Kim ),박성욱 ( Sung Ook Park ) 한국회계학회 2016 회계저널 Vol.25 No.6

        본 연구는 2000년부터 2014년까지의 상장기업을 대상으로 Dickinson(2011)의 현금흐름패턴 방식을 이용하여 기업수명주기와 조세회피와의 관계에 대해 살펴보았다. 지금까지 기업수명주기와 관련된 대부분의 선행연구는 Anthony and Ramesh(1992)가 재무성과 자료를 활용하여 측정한 방법으로 연구가 진행되었다. 이러한 방법은 매출액성장률, 배당성향, 자본적 지출액과 기업연령을 이용하여 수명주기단계별로 포트폴리오에 의한 분류를 통하여 측정된다. Dickinson(2011)은 이러한 포트폴리오로 구성된 수명주기 측정에 있어 그 분류과정이 자의적인 분배과정이 개입된다고 지적하며, 수명주기 측정방법에 있어 현금흐름패턴을 이용한 방법이 더욱 우월하다고 주장하였다. 본 연구에서는 현금흐름패턴방식을 사용하여 조세회피와의 관계를 연구하였으며, 그 분석결과는 수명주기 단계별로 조세회피수준 크기가 다르게 나타났다. 구체적으로 성장기는 성숙기와 비슷한 조세회피수준으로 나타났으며, 성장기와 성숙기가 도입기와 쇠퇴기보다는 조세회피수준이 높은 것으로 나타났다. 이러한 결과는 수명주기단계별로 조세회피성향이 다른 것을 의미하며, 기업특성요인인 조세부담정도, 조세혜택수준, 수익성, 금융비용 부담수준 등이 수명주기 단계별로 각기 다르게 영향을 미칠 수 있음을 보여주는 것이다. This study examines the relationship between tax avoidance and firm life cycle based on Dickinson (2011)`s cash flow pattern measure using listed firms during 2000-2014. Prior studies on firm life cycles have relied on measures based on financial performance in Anthony and Ramesh (1992). This measure classifies firm life cycles by sorting portfolios based on sales growth, dividend yield, capital expenditures, and firm age. Dickenson (2011) proposes a new measure based on cash flow patterns which is less discretionary compared to the former measure. Our study finds significantly different levels of tax avoidance across firms` life cycle. More specifically, the level of tax avoidance is similar in the growth and mature stages, whereas the level of tax avoidance is stronger in these two stages compared to the introduction and declining stage. These results imply that tax avoidance is different across firms` life cycle and that firm characteristics such as tax burden, tax subsidy, profitability, and financial constraints have different effects according to the firm life cycle.

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