• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2002년도 가을 학술발표논문집 Vol.29 No.2 (2)
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• pp.331-333
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• 2002

협력적 여과 방법은 사용자의 평가 데이터를 이용하므로, 항상 초기 평가 문제(First-Rating Problem)와 희박성 문제(Sparsity Problem)가 발생한다. 최근 이러한 문제를 해결하기 위해 많은 연구가 진행되고 있는 데, 본 논문에서는 연관 규칙을 이용하여 이러한 문제를 해결하고자 한다. 사용자의 평가 데이터를 이용하여 아이템간의 연관성을 산출하고, 연관성이 높은 아이템끼리 군집한다. 사용자와 군집간에 피어슨 상관 계수(Pearson Correlation Coefficient)를 이용하여 가중치를 구하고, 이것으로 선호도를 예측한다. 이러한 방법을 기존의 협력적 여과 방법과 함께 속성에 의한 군집 방식과 비교 평가하였다. 또한, 효율적인 군집을 위한 Split Cluster Method를 제안하고, 기존의 트리 방식의 군집과 비교 평가하였다.

• 한국항공운항학회지
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• 제14권4호
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• pp.17-23
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• 2006

This paper describes the preliminary design procedure for the hybrid propulsion system. For a given mission defined by velocity increment, the design of a polyethylene/LOX hybrid rocket was implemented. In addition, Seven-cluster multi-port fuel-grain was considered. After determining the system size including the combustion chamber, the performance parameters such as specific impulse, thrust, characteristic velocity, and thrust coefficient can be predicted by using empirical regression rate correlation, though most of preliminary design code assume constant regression rate. The results of the performance prediction indicated that besides the widely used HTPB/LOX, polyethylene/LOX hybrid motor can be a viable alternative to the more widely used SRMs.

• Journal of Plant Biotechnology
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• 제33권2호
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• pp.139-145
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• 2006

The present study is the first report of molecular variations in different accessions of Rauvolfia tetraphylla L.f, a medicinally important plant collected from seven locations of Andhra Pradesh, India. Molecular analysis was carried out using RAPD markers. Out of the 40 primers screened from OPA and OPC Kts, a total of 205 scorable polymorphic markers out of 397 total markers were generated. Polymorphism of 51.6% was found with 3 unique markers. Levels of genetic diversity within accessions i.e., the genetic distance ranged from 0.816-0.932. Cluster analysis based on Dice coefficient showed two major groups indicating that mostly in cross-pollinated plants, high levels of differentiation among accessions exists independent of geographical distance. Hence the results of the present study can be seen as a starting point for future researches on the population and evolutionary genetics of this species. Understanding such variation would also facilitate their use in various conservational management practices, rootstock breeding and hybridisation programmes.

• 한국주거학회논문집
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• 제18권5호
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• pp.143-150
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• 2007

The purpose of this research is to example the general trend of the service environment evaluation of the silver town and classify based on the service environment evaluation to suggest a effective method and alternatives fur development companies. The survey population of this study focused on 40s and 50s' middle aged both genders living in the Seoul and national capital region, we used random sampling method. The analytical methods used in this study were frequency, mean, standard deviation, factor analysis, Chi-Squae analysis, ANOVA, cluster Analysis, post-hoc estimation (Duncan test), To verify the reliability of each measure, Cronbach's alpha coefficient was used. As a result of classifying the environment evaluation elements, it was classified into 5 groups for the differentiating strategy on each group. The groups are: life support service type, medical and health support service type, cultural support service type, indifference type, and food support service type.

• Journal of Plant Biology
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• 제30권4호
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• pp.267-276
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• 1987

A pollen analytical study was carried out on the accumulated humus samples collected from 27 sites under the different plant communities of Mt. Seolag. These pollen spectra were then compared with the actual vegetation. The aboreal pollen(AP) and non-abnoreal pollen(NAP) were 1 Family 25 Genus and 5 Family 5 Genus, respectively. Among the aboreal pollen identified, the pollen of Pinus, Quercus, Betula and Acer were appeared in abundance and the coniferous pollen of Pinus was occupied at least 20%-65% through all the sites studied. The pollens of Abies, Betula, accer, Quercus, Carpinus, Corylus, Fraxinus, Styrax, Prunus and Ericaceae were in accordance with the present vegetation but the other pollens were inconsistent with the actual vegetaton. It suggests that it was caused by the difference between Wehseolag and Namseolag of subalpine zone in Mt. Seolag was 200 m by pollen spectra. Quercus was distributed at the lower part of Namseolag and the subalpine boreal elements were increased with increasing altitudes. The pollen spectra of each site was put together into 5 groups of pollen assemblage by cluster analysis and the community coefficient (CC) was over 60% between all sites studied.

• 한국주거학회논문집
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• 제2권2호
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• pp.55-69
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• 1991

The purpose of this study were 1) to identify the pattern of general life style of the middle classs apartment residents. 2) to examine the types of the home furnishing attitudes of those. 3) to find out the relationships between life style and the home furnishing attitudes. The data were collected using self-administered questionnaire. The respondents were 227 homemakers of the middle class apartment residents, selected through stratified random sampling technique. Data were coded and analyzed using SPSS computer packages. The statistics used were frequency, percentage. Pearson's correlation coefficient, F-test, X2-test, factor and cluster analysis. 6 patterns of life style and 6 types of the home furnishing attitudes were identified. The relationships between the life style and the home furshing attitudes were interpreted by 25%.

• 가정과삶의질연구
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• 제10권2호
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• pp.163-178
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• 1992

This study is focused on causual relationship analysis among the components of family resource management system based on a theory of Deacon and Firebaugh. The system of family resource management is consisted for the component of input like on objective resource and level of resource perception, the component of throughput like a behavior pattern of the family resource management, and the component of output like a degree of the family life satisfaction. The instrument for resource perception level, behavior pattern of family resource management and degree of life satisfaction were developed for this study, and main investigation was executed through 1st and 2nd pre-test. The 800 questionnaire were distributed by cluster sampling to the homemakers in Seoul. The final data used in this study were 703, and analyzed by Cronback's coefficient, factor analysis. frequency. percentage, regression analysis and path analysis, and teated with SAS PC+. Consequently , the findings of this study were accepted hypothesis I, II, II, IV.

• 한국조경학회지
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• 제24권4호
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• pp.96-111
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• 1997

This study was carried out to identify users' choice behavior of theme parks. overland. Lotte World, Seoul Land, Dreamland and Children's Grand Park were selected as study areas. Both multinomial logic model(MNL), nested logic model(NMNL) and joint logit model wet$.$e test using a choice-based sample collected on study areas. Hausman-McFadden test showed that the MNL is not appropriate because the IIA assumption is violated. To avoid the problematic IIA assumption, the NMNL was tested. It splits similar alternatives into groups and nests separate decisions into hierarchical order to avoid the IIA assumption. Cluster analysis and discriminant analysis were conducted to find applicable nest structures. The inclusive value coefficient was 0.7788. It meant that sufficient condition of this model is met and users' choice behavior can be better understood by NMNL than MNL. The $\rho$2 value and accuracy of prediction of this model were 0.402 and 46.33% , respectively. Several comments were suggested to make the NMNL to be more reliable for future research on users' choice behavior of theme park.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2013년도 춘계학술발표대회
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• pp.342-345
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• 2013

본 논문은 모바일 환경에서의 다중생체인식을 통한 개인인증 시스템을 제안한다. 다중생체인식을 위하여 얼굴인식과 화자인식을 선택하였으며, 시스템의 인식 시나리오는 다음을 따른다. 얼굴인식을 위하여 Modified census transform (MCT) 기반의 얼굴검출과 k-means 클러스터 분석 (cluster analysis) 알고리즘 기반의 눈 검출을 통해 얼굴영역 전처리를 수행하고, principal component analysis (PCA) 기반의 얼굴인증 시스템을 구현한다. 화자인식을 위하여 음성의 끝점 추출과 Mel frequency cepstral coefficient(MFCC) 특징을 추출하고, dynamic time warping (DTW) 기반의 화자 인증 시스템을 구현한다. 그리고 각각의 생체인식을 본 논문에서 제안된 방법을 기반으로 융합하여 인식률을 향상시킨다.

• 임상간호연구
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• 제18권3호
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• pp.354-367
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• 2012

Purpose: This study was done to verify validity and reliability of a neonatal patient classification system (NeoPCS-1). Methods: An expert group of 8 nurse managers and 40 nurses from 8 Neonatal Intensive Care Units in Korea, verified content validity of the measurement using item level content validity index (I-CVI). The participants were nurses caring for 469 neonates. Data were collected from November 11 to December 14, 2011 and analyzed using descriptive statistics, ANOVA, intraclass correlation coefficient, and K-cluster analysis with PASW 18.0 program. Results: Nursing domains and activities included 8 items with 91 activities. I-CVI was above .80 in all areas. Interrater reliability was significant between two raters (r=.95, p<.001). Classification scores for participants according to patient types and nurses' intuition were significantly higher for the following patients; gestational age (${\leq}29$ weeks), body weight (<1,000 gm), and transfer from hospital. Six groups were classified using cluster analysis method based on nursing needs. Patient classification scores were significantly different for the groups. Conclusion: These results show adequate validity and reliability for the NeoPCS-1 based on nursing needs. Study is needed to refine the measurement and develop index scores to estimate number of nurses needed for adequate neonatal care.