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이상현,이상준,문경일,조성의 한국IT서비스학회 2009 한국IT서비스학회지 Vol.8 No.4
Objectifying claims filed during the warranty period, analyzing the current circumstances and improving on the problem in question is an activity worth doing that could reduce the likelihood of claims to occur, cut down on the costs, and enhance the corporate image of the manufacturer. Existing analyses of claims are confronted with two problems. First, you can’t precisely assess the risks of claims involved by means of the value of claims per 100 products alone. Second, even in a normal state, the existing approach fails to capture the probabilistic conflicts that escape the upper control limit of claims, thus leading to wrong control activities. 1 이상현·이상준·문경일·조성의 To solve the first problem, this paper proposed that a time series detection concept where the claim rate is monitored based on the date when problems are processed and a hazard function for expression of the claim rate be utilized. For the second problem, this paper designed a model whereby to define a normal state by making use of PID (Proportion, Integral, Differential) and infer by way of a fuzzy concept. This paper confirmed the validity and applicability of the proposed approach by applying methods suggested in the actual past data of warranty claims of a large-scaled automotive firm, unlike hypothetical simulation data, in order to apply them directly in industrial job sites, as well as making theoretical suggestions for analysis of claims.
라이프 스타일 유형에 따른 화장품 구매행동과 추구가치에 관한 연구: 20대와 30대를 중심으로
이상현,유창조,최성문 한국소비자·광고심리학회 2005 한국심리학회지 소비자·광고 Vol.6 No.3
Most past lifestyle research have been conducted using the outdated lifestyle items. The outdated items could not reflect the rapidly changing people's lifestyle. In addition, only few studies had focused on women's cosmetic purchase behavior. Therefore, this study classified types of lifestyle for the cosmetic consumers and analyzed how purchasing behaviors and pursuing values are different based on the types of lifestyle. 20-30's women are selected as research sample because they actively purchase cosmetics and they are sensitive so that they often respond rapidly to marketing activities. Total 307 questionnaire were returned. Factor analysis and cluster analysis were conducted to classify types of lifestyle. The results of the cluster analysis have shown that there are four lifestyle classification: traditional solid type, well-being pursuit type, openness type, ostentation type. In addition, As the result of ANOVA test, cosmetic purchasing behavior and pursuing values are significantly different based upon types of lifestyle. 요인점수를 기준으로 몇 개의 군집으로 분류하고자 군집분석을 실시하였다. 집단별 라이프스타일 요인에 대한 평균치를 토대로 해당 요인에 대해 어떠한 반응을 보이는 가에 따라서 즉 해당요인에 가장 높게 반응한 집단을 중심으로 해당 집단의 특성을 파악하였다. 집단의 수를 결정함에 있어서는 총 4개의 집단이 적당한 것으로 판단되었다. 집단별 라이프스타일 요인에 대한 반응결과는 <표 4>와 같다.<표 4> 집단별 라이프스타일 요인에 대한 반응
이상현 대구대학교 새마을지역사회개발연구소 1978 지역사회개발논총(地域社會開發論叢) Vol.1 No.-
The object of this study is to seek the device of effective propulsion of cooperative-work in Sae-Mauel Undong[New Village Movement]. The frame of this study is composed of bibliograplical study and research based upon the theoretical background. The bibliographical study depended on social work literature related to community development and statistic resources of the government office, and then research was realized through case study in the Gu-Dam bridge construction work. The conclusion of this study as follows: First, the unit of Sae-Mauel Undong shall be larger in the scale because of attributes of the Movement. Therefore, cooperative work in which two villages and over participated is very important. This cooperative-work aims at development of Community consciousness- we feeling, or village who has taken the community cousciousness is able to deploy the cooperative-work. Second, but in the present time the Sae-Mauel Undong has hold many problems, that is to say, administrative problems, for what, problems of propulsive committee. The cooperative-work is propelling uniformly and unscientifically. Third, it is better to devide cooperative-work into two region. One is the work aiming at development of community consciousness for villager who haven't cooperative sprits, the other is the work for reinforcement of the consciousness for village who has more or less the cooperative sprits. In case of former, community development theory is looked upon as proper, and in latter, community organization theory is considered to be proper. Forth, when the community organization theory is applied to the cooperative-work the professional community worker should participate.
인진호탕(茵蔯蒿湯)과 오수목과탕(吳茱木瓜湯)의 항산화(抗酸化) 및 간세포(肝細胞) 보호효과(保護效果)
이상현,김영복,Lee, Sang-Hyun,Kim, Young-Bok 대한한의학방제학회 2008 大韓韓醫學方劑學會誌 Vol.16 No.1
Korean traditional medicine has been used for the treatment of the various diseases based on both oriental medicinal theory and clinical trials. Thus, the prescriptions of Korean traditional medicine would be useful for the development of new therapeutics. This research focuses on the fundamental study in Korean traditional prescriptions for the development of new hepatoprotective agents. We found two prescriptions. Injinho-Tang and Osumogwa-Tang, showed the significant DPPH free radical scavenging and hepatoprotective effect, respectively. It is well-known that free radical scavenging effect is related to the prevention of various pathological events including liver injury. This paper deals with hepatoprotective effects on tacrine-induced cytotoxicity in Hep G2 cells, free radicals scavenging on both DPPH and superoxide of above two prescriptions. Hot water extract of Injinho-Tang did not show the significant hepatoprotective effect on tacrine-induced cytotoxicity in Hep G2 cells, however, it shows the significant scavenging effects for both DPPH and superoxide radicals. On the other hand, all of the hot water extracts of constituent herbal drugs in Injinho-Tang exhibited the promising protective effect on tacrine-induced cytotoxicity in Hep G2 cells. Of these, water extract of Rhei Rhizoma showed the most prominent effect on tacrine-induced cytotoxicity in Hep G2 cells. Bioassay-guided fractionation of Rhei Rhizoma extract has furnished four compounds, and their chemical structures have been identified by comparison of their spectral data with those of literature as chrysophanol (1), emodin (2), 3,5-dihydroxy-4'- methoxystilbene (3), and rhapontigenin (4), respectively. Among the isolated compounds, compounds 2-4 revealed the significant hepatoprotective effect in vitro when their $EC_{50}$ values compare with that of silybin, as a positive control. It also exhibited that emodin possessed the most hepatoprotective effect among these active compounds. In case of Osumogwa-Tang, its hot water extract showed the moderate protective effect on tacrine-induced cytotoxicity in Hep G2 cells. Hot water extract of Chaenomelis Fructus, one of the constituent herbal drug of this prescription, exhibited the significant hepatoprotective effect with $EC_{50}$ value of $7.8{\pm}0.1\;{\mu}g/ml$, however, it showed strong cytotoxicity in Hep G2 cells above the concentration of $25\;{\mu}g/ml$. It was revealed that both hot water extract of Evodiae Fructus and its butanol soluble fraction showed the moderate hepatoprotective effect but concentration-dependent activity in Hep G2 assay system. Two quinolone alkaloids, evocarpine and dihydroevocarpine, also tested for their hepatoprotective effects on tacrine-induced cytotoxicity in Hep G2 cells, however, these two compounds derived from the Evodiae Fructus as the major constituents did not show in vitro hepatoprotective effect. From these results, it would be necessary to further isolation of its hepatoprotective compounds from the butanol soluble fraction of the hot water extract of Evodiae Fructus.
말레익 폴리에틸렌/층상 실리케이트 나노복합재의 열물성 측정
이상현,김석원,김정은,송현훈 한국물리학회 2005 새물리 Vol.51 No.6
Nanocomposites are a new class of composites in which the reinforcing phase's dimensions are on a the nanometer scale. In particular, the layered silicates are considered to be good candidates for the preparation of polymer-inorganic nanocomposites. The mechanical and the thermal properties of a polymer can be altered by adding a few vol.\% of the nano-particles. In this study, we focused on the effect of nano-sized particles on the thermophysical properties such as melting and crystallization, coefficient of thermal expansion, and thermal conductivity. We prepared PEMA/layered silicate nanocomposites and investigated their thermophysical properties by using DSC and the 3$\omega$ method, respectively. The content of layered silicate was varied from 0.5 vol.% to 5 vol.%. 나노복합재는 강화제의 크기가 나노미터 크기를 갖는 새로운 개념의 복합재이다. 강화제로 사용되는 층상 실리케이트는 특히 고분자/무기재료 나노복합재의 좋은 후보물질로 평가되고 있다. 고분자재료의 기계적 열적 특성은 나노입자를 수 vol.\%만 첨가해도 획기적으로 변화시킬 수 있다. 본 연구에서는 나노크기의 입자가 나노복합재의 융점 및 결정화 온도, 열팽창계수, 그리고 열전도도 등 열물성에 미치는 영향을 조사하기 위하여 말레익 폴리에틸렌 (PEPA)과 실리케이트인 점토 (Lapo)로 이루어진 PEMA/Lapo 나노복합재 시편을 제작하고 시차주사열량계 (DSC), 열기계 분석기 (TMA), 그리고 3$\omega$ 장치 등으로 열물성을 측정하였다. 그 결과 실리케이트인 Lapo의 작은 함량변화에도 열물성 값의 변화가 뚜렷함을 확인하였다.