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열분해와 Hot Injection법을 이용한 CoSb<sub>3</sub> 나노분말합성
김민숙,안종필,김경자,박주석,김경훈,김형순,Kim, Min-Suk,Ahn, Jong-Pil,Kim, Kyung-Ja,Park, Joo-Seok,Kim, Kyoung-Hun,Kim, Hyung-Sun 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.6
$CoSb_3$ with its high electrical conductivity, Seebeck coefficient and rather low thermal conductivity is quite a promising material for thermoelectric conversion applications. A potentially high figure of merit (ZT) can be achieved by a nanostructure evolution of thermoelectric materials. In this work, $CoSb_3$ nanoparticles were synthesized through a thermal decomposition method in cooperation with a hot injection technique. Nano-sized $CoSb_3$ particles were obtained through the thermal decomposition reaction between the pre-heated cobalt-oleate at $320^{\circ}C$ and the injected antimony oleate with room temperature. The results showed that the particle size was increased with increasing synthesis temperature and the crystallinity of particles was improved with temperature but the decomposition of $CoSb_3$ was observed at $320^{\circ}C$. The $CoSb_3$ particles synthesized at $300^{\circ}C$ showed a high purity and an homogeneous shape with average particle size of 26 nm.
방전플라즈마 소결 공정을 이용한 CoSb<sub>3</sub>/Al/Ti/CuMo 접합 특성
김민숙,안종필,김경훈,김경자,박주석,서원선,김형순,Kim, Min Suk,Ahn, Jong Pil,Kim, Kyoung Hun,Kim, Kyung Ja,Park, Joo Seok,Seo, Won Seon,Kim, Hyung Sun 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.6
$CoSb_3$-based skutterudite compounds are candidate materials for thermoelectric power generation in the mid-temperature range (600 - 900 K) because their thermoelectric properties can be enhanced by doping and filling. The joining property of thermoelectric module electrodes containing thermoelectric materials is of great importance because it can dominate the efficiency of the thermoelectric module. This study examined the properties of $CoSb_3$/Al/Ti/CuMo joined by the spark plasma sintering technique. Titanium thin foil was used to prevent the diffusion of copper into $CoSb_3$ and Aluminum thin foil was used to improve the adhesion between $CoSb_3$ and Ti. The insertion of an Aluminum interlayer between the Ti and $CoSb_3$ was effective for joining $CoSb_3$ to Ti by forming an intermediate layer at the Al-$CoSb_3$ boundary without any micro cracks. Specifically, the adhesion strength of the Ti/Al/$CoSb_3$ joining interface showed a remarkable improvement compared with our previous results, without deterioration of electrical property in the interface.
서스펜션 플라즈마 스프레이 코팅법을 이용한 이트리아 코팅막 제조와 특성
김민숙,소성민,김형순,박성환,함영재,전민석,김경훈,Kim, Min Suk,So, Sung Min,Kim, Hyung Soon,Park, Seong Hwan,Ham, Young Jae,Jeon, Min Seok,Kim, Kyoung Hun 한국결정성장학회 2019 한국결정성장학회지 Vol.29 No.6
The suspension plasma spraying is a modification of conventional plasma spray techniques that has been developed to overcome the challenge of using fine particles in plasma spray processes. In this study, microstructure developments and mechanical property of yttrium oxide (Y<sub>2</sub>O<sub>3</sub>) coatings prepared by the suspension plasma spray coating technique have been investigated to determine the effect of processing parameters including plasma gun current and total gas flow. The results showed that a highly dense Y<sub>2</sub>O<sub>3</sub> coating having low porosity of 0.2 vol% without any lamellar structures can be achieved at the optimum condition of gun current 200 A and total gas flow 220 L/min. 서스펜션 플라즈마 스프레이 법은 미세한 분말을 용사 공정에 적용함으로써 전통적인 플라즈마 스프레이 법의 단점을 극복하고자 개발된 코팅법이다. 본 연구에서는 고밀도의 Y<sub>2</sub>O<sub>3</sub> 코팅막을 제조하기 위해 서스펜션 플라즈마 스프레이법을 이용하여 플라즈마 건의 전류량과 총 가스 유량을 공정변수로 하여 코팅막을 제조하였으며, 그에 따른 코팅막 특성에 대한 연구를 하였다. 코팅막의 미세구조 및 물리적 특성 평가 결과 플라즈마 건 전류량 200 A, 총 가스 유량 220 L/min의 조건에서 층상 결함 없이 0.2 vol%의 매우 낮은 기공률을 갖는 고밀도의 Y<sub>2</sub>O<sub>3</sub> 코팅막을 제조할 수 있었다.
한국형 전시자원소요산정 모델에 대한 VV&A 적용방안 연구
김민숙,정환식,이재영,Kim, Min-Suk,Jung, Whan-Sik,Lee, Jae-Yeong 한국국방경영분석학회 2009 한국국방경영분석학회지 Vol.35 No.2
최근 국방분야에서 M&S의 중요성이 증가함에 따라 이를 검증, 확인, 인증 할 수 있는 VV&A의 필요성이 요구되고 있다. VV&A는 M&S 개발시 신뢰성을 높이고, 사용자의 요구사항을 충족시켰는지를 판단하기 위한 정보를 제공한다. VV&A 과정은 M&S의 신뢰성을 보증하기 위해 필요한 활동이다. 그러나 한국에서는 현재까지 M&S 개발시 VV&A에 대한 지침과 규정이 정립되어 있지 않다. 본 연구에서는 VV&A 절차의 일부를 현재 육군에서 개발 중인 한국형 전시자원소요산정 모델에 적용하기 위해 계획은 전단계에 대해 수립하였고 제한적으로 근접지역 직접사격 손실논리에 대해 결과확인을 실시하였다. 이는 M&S 개발시 VV&A 적용의 필요성을 인식할 수 있는 계기를 제공하였다. Recently, the necessity of VV&A and the importance of M&S are increasing in the national defense area. The purpose of VV&A is to assure a proper development of M&S and to provide users with sufficient information to determine if M&S could meet their demands. Therefore, VV&A process needs to be performed to guarantee the credibility of the M&S. However, the basic guidance and regulation of VV&A are not yet developed in Korea. This paper proposed the VV&A application process in the Korean Wartime Resource Requirement Model, focusing on the close combat situation of the model. The VV&A process provided in this paper can also be applied to other analytical models currently developing in Korea.
철근콘크리트 플랫 플레이트의 뚫림전단 거동에 관한 해석적 연구
김민숙,이영학,김희철,Kim, Min-Sook,Lee, Young-Hak,Kim, Hee-Cheul 한국전산구조공학회 2010 한국전산구조공학회논문집 Vol.23 No.4
본 논문에서는 플랫 플레이트 구조의 뚫림전단 거동을 평가할 수 있는 유한요소해석 모델을 제시하고 변수 해석을 통해 플랫 플레이트 구조의 뚫림전단 거동에 영향을 미치는 인자들을 파악함으로써 향후 현행 설계식 보정에 있어 기초자료를 제공함에 그 목적을 두었다. 전단변형을 고려하기 위해 Reissner-Mindlin 가정이 도입된 퇴화 쉘 요소를 선택하였으며, 철근콘크리트의 재료적 비선형 거동을 고려하기 위해 적층쉘 개념을 적용한 유한요소해석 모델을 제시하였다. 유한요소해석 모델의 신뢰성을 검증하기 위해 기존 실험결과와 비교하였으며, 그 결과 유한요소해석 모델이 실험결과를 비교적 잘 예측하는 것으로 나타났다. 제시한 유한요소해석 모델을 사용한 변수해석을 통해 휨 철근비와 슬래브의 두께가 증가할수록 플랫 플레이트의 전단강도 또한 증가하는 것을 알 수 있었다. A finite element model for punching shear of flat plate structures is presented. A parametric study also has been conducted to verification of influence of several parameters in terms of the flexural reinforcement ratio, slab thickness. Reisnner-Mindlin assumptions are adopted to consider of shear deformation. Layered shell element is considered for the material non-linearities. The finite element model of this study was verified comparing with existing experimental results. The model is able to predict the capacity of the flat plate structures. The punching shear of flat plate structures varied depending on the flexural reinforcement ratio, slab thickness.
한국형 공황장애 약물치료 알고리듬 2008 : 공황장애의 진단, 치료 반응과 관해의 평가
김민숙,유범희,김찬형,윤세창,이상혁,서호석,양종철,한국형 공황장애 약물치료 알고리듬 2008 연구그룹,Kim, Min-Sook,Yu, Bum-Hee,Kim, Chan-Hyung,Yoon, Se-Chang,Lee, Sang-Hyuk,Suh, Ho-Suk,Yang, Jong-Chul 대한불안의학회 2008 대한불안의학회지 Vol.4 No.1
Objective : This article is a part of the Korean Medication Algorithm Project for Panic Disorder, which aims to build consensus regarding the diagnosis, treatment response and achievement of clinical remission for patients with panic disorder in Korea. Methods : The questionnaire used in this article had parts : 1) diagnosis, 2) treatment response, and 3) remission for patients with panic disorder. The questionnaire was completed by each of 54 Korean psychiatrists who had much experience in treating patients with panic disorder. We classified the experts' opinions into 3 categories (first-line, second-line, and third-line) using the ${\chi}^2$-test. Results : Five factors were considered in this research : panic attack, anticipatory anxiety, phobic avoidance, severity of illness, and psychosocial disability. Most reviewers agreed that the presence of a panic attack was the most important factor in the diagnosis of patients with panic disorder. Phobic avoidance was included in the first-line category, whereas the severity of illness and psychosocial disability were included in the second-line category. Most reviewers also agreed that the presence of a panic attack was the most important factor in determining the appropriate treatment response, and it was included in the first-line category along with several other items. To determine remission status, the patients' scores on tests pertaining to the severity of panic attack, anticipatory anxiety, phobic avoidance, severity of illness and psychosocial disability should be less than 3.0-3.3 on a 9-point Likert scale. Conclusion : We suggest useful information for making a diagnosisof panic disorder, determining the appropriate treatment response and identifying remission in panic disorder patients on the basis of the results of a nationwide survey of experts in Korea.
김민숙,조은선,이영학,Kim, Min Sook,Jo, Eunsun,Lee, Young Hak 한국전산구조공학회 2014 한국전산구조공학회논문집 Vol.27 No.6
불확실성을 가지는 콘크리트의 특성으로 인해 철근 콘크리트 부재의 처짐에는 높은 변동성이 발생할 수 있다. 그러나 현행 설계규준은 이를 고려하지 않고 경험적인 데이터에 바탕을 두고 있으며, 부재의 최소 두께 또는 최대 허용 처짐만을 제시하고 있다. 본 논문에서는 철근 콘크리트 플랫 플레이트의 처짐 예측이 가능한 유한요소해석 모델에 확률해석 모델을 적용하여 철근 콘크리트 플랫 플레이트 처짐의 변동성을 평가하고자 하였다. 이를 위해 콘크리트, 철근, 부재치수, 인장강성에 관련된 8개 요소를 변수로 한 몬테카를로 시뮬레이션을 수행하였다. 해석결과, 스팬의 크기가 증가할수록 하중으로 인한 처짐에 더 민감하게 반응하는 것으로 나타났으며, 재하되는 활하중의 크기가 클수록, 슬래브의 두께가 작을수록 처짐의 변동성이 큰 것으로 나타났다. The deflection of reinforced concrete members can be highly variable, due to uncertainties in the characteristics of the concrete. However, current standards do not take this problem into account, instead recommending only the minimum thickness and maximum allowable deflections based on empirical data. This paper is aimed at evaluation deflection variabilities by applying a probabilistic analysis model to a finite element analysis model. To evaluate the variabilities of deflections, a Monte Carlo simulation, which incorporated the eight parameters related to concrete, reinforcement, member size, and tension stiffening. The results showed that lager spans were more sensitive to the deflection due to loads and that as the applied live loads were increases and the slab thickness were decreased, the deflection variability increased.