중성자를 이용한 리튬이온 이차전지 전극 구조분석

김창섭,박헌용,양연화,김지영,성백석,김건,Kim, Chang-Seob,Park, Heon-Yong,Liang, Lianhua,Kim, Ji-Young,Seong, Baek-Seok,Kim, Keon 한국전기화학회 2007 한국전기화학회지 Vol.10 No.1

최근 높은 에너지 밀도를 갖고 있는 리튬 이온 이차전지에 대한 관심이 높다. 리튬 이온 이차전지는 이미 휴대용 기기로 널리 적용되고 있으며, 하이브리드 전기자동차와 같은 고출력 전지시스템에 적용을 위해 연구되고 있다. 리튬 이온 이차전지의 전극 소재는 리튬 이온의 이동에 의해서 충전 및 방전되는 현상을 활용한다. 전극으로부터 리튬 이온이 이동될 때 전극내의 구조 변화가 발생한다. 전극의 구조분석은 중성자 또는 X-선을 이용하여 분석할 수 있다. X-선은 분석 시간이 짧고, 쉽게 분석할 수 있다는 장점이 있으나 원자내의 전자구름과의 산란을 응용하므로 전자가 적은 가벼운 원소의 경우 분석이 어려운 단점이 있다. 리튬도 원자량이 작아서 X-선 만으로는 리튬의 정확한 위치에 대한 분석이 어렵다. 중성자 분석기술은 이에 대한 해답이 될 것이다. 본 자료에서는 중성자를 활용한 전극물질의 구조 분석 사례 및 그 원리에 대해서 논의하고자 한다. Lithium ion secondary battery has been applied widely to portable devices, and has been studied for application to high power electric cell system such as power tool or hybrid electronic vehicle. The structure change of the electrodes materials occur when lithium ions move between electrodes. Neutron or X-rays can analyze the structure of electrode. The advantage of X-rays is convenient in test. However X-rays is scattered by electron cloud in atoms. Therefore, The elucidation for correct position of lithium is difficult with X-rays because lithium has small atomic weight. Neutron analysis techniques could solve this problem. In this review, We wish to discuss about structure analysis and the principle of structural characterization method using neutron beam source.

다변량 프로빗 모형을 이용한 가전제품 구매의 상관관계 분석

김창섭,신정우,이미숙,이종수,Kim, Chang-Seob,Shin, Jung-Woo,Lee, Mi-Suk,Lee, Jong-Su 한국마케팅과학회 2009 마케팅과학연구 Vol.19 No.2

As the lifestyle of consumers changes and the need for various products increases, new products are being developed in the market. Each household owns various home appliances which are purchased through the choice of a decision maker. These appliances include not only large-sized products such as TV, refrigerator, and washing machine, but also small-sized products such as microwave oven and air cleaner. There exists latent correlation among possession of home appliances, even though they are purchased independently. The purpose of this research is to analyze the effect of demographic factors on the purchase and possession of each home appliances, and to derive some relationships among various appliances. To achieve this purpose, the present status on the possession of each home appliances are investigated through consumer survey data on the electric and energy product. And a multivariate probit(MVP) model is applied for the empirical analysis. From the estimation results, some appliances show a substitutive or complementary pattern as expected, while others which look apparently unrelated have correlation by co-incidence. This research has several advantages compared to previous literatures on home appliances. First, this research focuses on the various products which are purchased by each household, while previous researches such as Matsukawa and Ito(1998) and Yoon(2007) focus just on a particular product. Second, the methodology of this research can consider a choice process of each product and correlation among products simultaneously. Lastly, this research can analyze not only a substitutive or complementary relationship in the same category, but also the correlation among products in the different categories. As the data on the possession of home appliances in each household has a characteristic of multiple choice, not a single choice, a MVP model are used for the empirical analysis. A MVP model is derived from a random utility model, and has an advantage compared to a multinomial logit model in that correlation among error terms can be derive(Manchanda et al., 1999; Edwards and Allenby, 2003). It is assumed that the error term has a normal distribution with zero mean and variance-covariance matrix ${\Omega}$. Hence, the sign and value of correlation coefficients means the relationship between two alternatives(Manchanda et al., 1999). This research uses the data of 'TEMEP Household ICT/Energy Survey (THIES) 2008' which is conducted by Technology Management, Economics and Policy Program in Seoul National University. The empirical analysis of this research is accomplished in two steps. First, a MVP model with demographic variables is estimated to analyze the effect of the characteristics of household on the purchase of each home appliances. In this research, some variables such as education level, region, size of family, average income, type of house are considered. Second, a MVP model excluding demographic variables is estimated to analyze the correlation among each home appliances. According to the estimation results of variance-covariance matrix, each households tend to own some appliances such as washing machine-refrigerator-cleaner-microwave oven, and air conditioner-dish washer-washing machine and so on. On the other hand, several products such as analog braun tube TV-digital braun tube TV and desktop PC-portable PC show a substitutive pattern. Lastly, the correlation map of home appliances are derived using multi-dimensional scaling(MDS) method based on the result of variance-covariance matrix. This research can provide significant implications for the firm's marketing strategies such as bundling, pricing, display and so on. In addition, this research can provide significant information for the development of convergence products and related technologies. A convergence product can decrease its market uncertainty, if two products which consumers tend to purchase together are integrated into it. The results

동충하초 분말 첨가 식빵의 품질 특성

김창섭 ( Chang Seob Kim ),최상원 ( Sang Won Choi ) 대구가톨릭대학교 자연과학연구소 2009 자연과학연구논문집 Vol.7 No.1

Cordyceps militaris(CM) have been reported to have a variety of biological actions, such as antimutagenic, anticarcinogenic, anti-inflammatory, and immunomodulatory activities. So development of various functional processed foods using CM powder is required. Herein, functional bread was made by addition of CM powder with 1%, 2% and 3% in ordinary bread compositions, and their physiochemical characteristics, such as baking loss, textures, color values, and organoleptic test, were determined. As a result, baking loss of the bread was increased with increasing amount of CM powder. Texture analysis showed that springiness of the bread was increased with adding more CM powder, while its gumminess was decreased. Cohesiveness and chewiness of the bread were decreased, as compared to the control bread. Meanwhile, b and a values of the bread were increased with increasing amount of CM powder, while L value was slightly decreased. Finally, from the sensory evaluation of bread, total sensory score of the bread was decreased with increasing amount of CM, but overall acceptability was not significantly different between 1% CM powder treatment and control. These results suggest that a good quality functional bread added CM powder may be obtained in addition of 1% CM powder.

개방식 장치를 이용한 난연성-가연성 이성분계 혼합물(CCl₄+o-Xylene and CCl₄+p-Xylene)의 인화점 측정

김창섭(Chang-Seob Kim),이성진(Sungjin Lee),하동명(Dong-Myeong Ha) 한국에너지학회 2015 에너지공학 Vol.24 No.4

연구논문 : 감피 첨가 식빵의 품질 특성

김창섭(Chang Seob Kim),정신교(Shin Kyo Chung) 한국식품저장유통학회 ( 구 한국농산물저장유통학회 ) 2001 한국식품저장유통학회지 Vol.8 No.2

위험물의 개념 정립에 관한 연구

김창섭(Chang Seob, Kim),하동명(Dong Myeonng, Ha) 한국위험물학회 2015 한국위험물학회지 Vol.3 No.2

The purpose of this study is to investigate the essential meaning of ‘hazardous materials’ which are defined differently by the objects of each law, regulation and agency. This research compares Korean laws with those of other developed countries and compares the typical differences. The original meaning of ‘hazardous materials’ is substances which are needed to respond immediately when an accident occurs. For the safety of the public who use this materials, it can be said in detail that ‘Hazardous Materials’ mean chemicals and chemical products which may cause danger to life, health, property or/and to the environment, and must therefore be properly controlled or authorized only when those are subject to specific restrictions. This shift of conception of ‘Hazardous Materials’ will be a foundation of the progress of safety management industry and base line data for the academic research.

동충하초 분말 첨가한 빵 반죽의 물리적 특성

김창섭 ( Chang Seob Kim ) 한국식품영양학회 2010 韓國食品營養學會誌 Vol.23 No.1

This study was carried out to develop an optimum baking formula and baking process for a new bread raw material with added Cordyceps militaris powder, which has been known to prevent various adult diseases and cancers. The rheological properities of dough made from Cordyceps militaris powder-wheat flour with 0, 1, 2, and 3% Cordyceps militaris powder added-were investigated. A farinogram showed that the water absorption and weakness value of dough increased with added Cordyceps militaris powder, but development time and dough stability were decreased. An extensogram showed that resistance to extension was increased in bread with 1% Cordyceps militaris powder, but decreased in bread with 2% and, 3% powder. Extensibility decreased fermentation progressed. An amylogram showed that gelatinization point was increased but maximum viscosity was decreased with added Cordyceps militaris powder. With increased amounts of powder dough volume during fermentation was reduced. The change in pH values of dough after mixing, fermentation, and proofing decreased with increased amounts of added powder.

특수재난의 개념과 정의에 관한 연구

김창섭(Chang Seob Kim),하동명(Dong Myeong Ha) 한국위험물학회 2016 한국위험물학회지 Vol.4 No.2

The government legislate against special disaster and launched the Ministry of Public Safety and Security according to take act to SEWOLHO accident. The utilization of central government staff augmentation without sufficient academic research is a tough environment as a tool of the hasty reorganization. Special disaster is one of several disasters. Therefore, this should not be used as a logical extension of the disaster only for government organizations. A special disaster is defined as “a thing that occurred due to a special substance such as a biological factor and a special apparatus and a trained personnel for disaster response are additionally required”. Special substances causing special disasters can be exemplified by chemical substances, radioactive substances, bacteria, viruses, nuclei, high explosives and the like, which is called CBRNE.

다변량 프로빗 모형을 이용한 가전제품 구매의 상관관계 분석

Chang Seob Kim(김창섭),Jung Woo Shin(신정우),Mi Suk Lee(이미숙),Jong Su Lee(이종수) 한국마케팅과학회 2009 마케팅과학연구 Vol.19 No.2

随着消費者生活方式的變化和對不同類型産品需求的增長, 市場上涌現出很多新産品. 每個家庭经過快策者的選擇購買了各種家用設備, 大的如電視, 冰箱, 洗衣機, 小的如微波炉, 吸尘器, 尽管些東西是分別購買的, 但是購買拥有这些用具之間存在着潛在的 關係. 本硏究目的在于分析入口統系變量對購買和拥有这些設備的影響, 發現这些設備之間的關係. 我们通過對消費者问卷調査電器和夌原家用設備來了解樣本家庭目前拥有家用設備的情況, 用多元槪率模型進行實證分析. 分析結果拥示, 一些設備之間存在着替和互補關係, 而另一些没有显著關係的则有偶然相關. 该硏究与以往硏究相比有以下特點, 首先, 關注每個家庭購買的各種産品, 而現有的硏究, 如Martsukawa, Ito(1998)和Yoon(2007)则只關注某種特定産品 ; 其次, 硏究方法同時考慮了每箇産品的選擇過程以及他们之間的關係 ; 最后, 不仅分析了同類型産品之間的替代和互補關係, 还分析了不同類産品之間的關係. 本硏究使用首尓大學的技術管理, 經濟和政策項目‘TEMEP"(THIES) 2008' 的數據, 首先用多元槪率模型人口統計變量對家庭購買家用電器的影響, 这些變量包括敎育水平, 居住地區, 收入和住房類型. 接下來不包括人口統計變量的多元槪率模型用來计每種家用電器之間的關係. 最后家用電器之間的關係用基于方差J矩阵的多维量表表示出來. 本硏究對公司在捆绑销售, 定价和産品展示方面的營销策略都有显著作用, 为開發家電産品和技術提供了信息, 一些繼承産品能把消費者所需要的多種設備的功能集于一身, 本硏究也为類産品的硏發提出了建議. As the lifestyle of consumers changes and the need for various products increases, new products are being developed in the market. Each household owns various home appliances which are purchased through the choice of a decision maker. These appliances include not only large-sized products such as TV, refrigerator, and washing machine, but also small-sized products such as microwave oven and air cleaner. There exists latent correlation among possession of home appliances, even though they are purchased independently. The purpose of this research is to analyze the effect of demographic factors on the purchase and possession of each home appliances, and to derive some relationships among various appliances. To achieve this purpose, the present status on the possession of each home appliances are investigated through consumer survey data on the electric and energy product. And a multivariate probit(MVP) model is applied for the empirical analysis. From the estimation results, some appliances show a substitutive or complementary pattern as expected, while others which look apparently unrelated have correlation by co-incidence. This research has several advantages compared to previous literatures on home appliances. First, this research focuses on the various products which are purchased by each household, while previous researches such as Matsukawa and Ito(1998) and Yoon(2007) focus just on a particular product. Second, the methodology of this research can consider a choice process of each product and correlation among products simultaneously. Lastly, this research can analyze not only a substitutive or complementary relationship in the same category, but also the correlation among products in the different categories. As the data on the possession of home appliances in each household has a characteristic of multiple choice, not a single choice, a MVP model are used for the empirical analysis. A MVP model is derived from a random utility model, and has an advantage compared to a multinomial logit model in that correlation among error terms can be derive(Manchanda et al., 1999; Edwards and allenby, 2003). It is assumed that the error term has a normal distribution with zero mean and variance-covariance matrix Ω. Hence, the sign and value of correlation coefficients means the relationship between two alternatives(Manchanda et al., 1999). This research uses the data of 'TEMEP Household ICT/Energy Survey (THIES) 2008' which is conducted by Technology Management, Economics and Policy Program in Seoul National University. The empirical analysis of this research is accomplished in two steps. First, a MVP model with demographic variables is estimated to analyze the effect of the characteristics of household on the purchase of each home appliances. In this research, some variables such as education level, region, size of family, average income, type of house are considered. Second, a MVP model excluding demographic variables is estimated to analyze the correlation among each home appliances. According to the estimation results of variance-covariance matrix, each households tend to own some appliances such as washing machine-refrigerator-cleaner-microwave oven, and air conditioner-dish washer-washing machine and so on. On the other hand, several products such as analog braun tube TV-digital braun tube TV and desktop PC-portable PC show a substitutive pattern. Lastly, the correlation map of home appliances are derived using multi-dimensional scaling(MDS) method based on the result of variance-covariance matrix. This research can provide significant implications for the firm's marketing strategies such as bundling, pricing, display and so on. In addition, this research can provide significant information for the development of convergence products and related technologies. A convergence product can decrease its market uncertainty, if two products which consumers tend to purchase together are integrated into it. The results of

DSM Monitoring을 위한 수리모형 개발에 관한 연구

김성일(Kim Sung-il),임재윤(Lim Jae-Yoon),장승찬(Chang Seungchan),김창섭(Kim Chang-Seob),김정훈(Kim Jung-Hoon) 대한전기학회 1997 대한전기학회 학술대회 논문집 Vol.1997 No.7