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김진화,변현수,Kim, Jin-Hwa,Byeon, Hyeon-Su 한국데이터정보과학회 2011 한국데이터정보과학회지 Vol.22 No.1
Recommendation systems are developed to overcome the problems of selection and to promote intention to use. In this study, we propose a recommendation system using adjacency data according to user's behavior over time. For this, the product adjacencies are identified from the adjacency matrix based on graph theory. This research finds that there is a trend in the users' behavior over time though product adjacency fluctuates over time. The system is tested on its usability. The tests show that implementing this recommendation system increases users' intention to purchase and reduces the search time. 온라인 사용자에게 선택의 어려움을 줄여주고 사용의도를 높이기 위해 만들어진 것이 추천시스템이다. 추천시스템은 정보검색과 정보필터링을 용이하게 하고, 정보 과잉의 문제를 해결하는 데에 많은 도움을 주고 있다. 본 연구의 목적은 웹 상점을 이용하는 사용자들의 클릭스트림 데이터를 분석하여 데이터 인접성의 차이를 확인하고, 이를 통해 상품추천을 제안하고자 하는 데에 있다. 본 연구에서 제안하는 추천시스템의 성과를 검증하기 위하여 실험을 통해 알아본 결과, 추천시스템 적용 전보다 적용 후에 사용자들의 구매 의도는 높아졌고 탐색시간은 줄어들었다.
악관절 관절원판 위치변화가 관절원판 형태 및 골변화에 미치는 영향
김진화,이완,이병도,Kim Jin-Hoa,Lee Wan,Lee Byung-Do 대한영상치의학회 2006 Imaging Science in Dentistry Vol.36 No.1
Purpose : The objective of this study was to investigate the effect of TMJ disc displacement on the TMJ disc configuration and surrounding osseous structure. Materials and Methods : The proton density and 72-weighted MR images of 57 TMJs were retrospectively studied. These TMJs were divided into three groups according to the anterior disc displacement status on MR sagittal images, those were the normal, anterior disc displacement with reduction (ADWR), anterior disc displacement without reduction (ADWOR). The frequency of disc configuration and surrounding bony change, the border status between articular disc and retrodiscal tissue were investigated according to the positional change of articular disc. Results : There were significant statistical differences of chi-square statistics of TMJ disc configurational type between normal and ADWR/ADWOR group, respectively. Surrounding bony change frequently appeared in ADWOR and a statistically significant difference of chi-square statistics of bony change frequency between normal and ADWOR group was observed. Conclusion : These results suggested that the disc configuration and bony change of TMJ are strongly related to TMJ disc displacement.
성격과 전공만족도의 관계에 대한 전공 선택 유형의 매개효과
김진화,임은미 한국진로교육학회 2014 진로교육연구 Vol.27 No.4
The purpose of this study is to examine the relationships among personality, major selection type, and major satisfaction. For this purpose, 554 (330 males and 224 females) University students from Kyung-gi, Honam, Yeongnam, Chungnam province completed 3 surveys consisted of Big 5 personality tests, major selection type questionnaires, major satisfaction scale. Data were analyzed by structural equation modeling using AMOS 18.0 program and Reliability Analysis, Correlation Analysis using SPSS WIN 18.0The results of this study were as follows: First, the more the personality of the research subjects is stable, extravert, open, agreeable, and conscientious, the more their major satisfaction and their autonomous major selection is stronger. Second, autonomous major selection is related to major satisfaction positively, but dependent major selection is related negatively. Third, autonomous major selection partially mediate the relationship between personality and major satisfaction. These results suggest that the career counselors pay attention to the personality and the major selection type to help the university students being satisfied with their own major. 본 연구에서는 전공만족도에 대한 성격과 전공 선택 유형의 관계를 탐색하였다. 이를 위해 경기, 충남, 호남, 영남지역의 4년제 대학 재학생에게 성격, 전공만족도, 전공 선택 유형에 대한 설문조사를 실시하였고, 554명(남 330명, 여 224명)의 응답 자료를 분석하였다. 연구결과 첫째, 연구대상 대학생들의 성격특성이 안정성, 외향성, 개방성, 우호성, 성실성의 측면에서 긍정적일수록 전공만족도와 자율적 전공 선택 정도는 높아졌고, 의존적 전공 선택 정도는 낮아졌다. 둘째, 자율적 전공 선택은 전공만족도와 정적 상관을 보였으나 의존적 전공 선택 유형은 전공만족도와 부적상관을 보였다. 셋째, 자율적 전공 선택 유형은 성격과 전공만족도 간의 관계를 부분 매개하였다. 이러한 결과는 대학생의 전공만족도를 높이기 위한 개인내적 변인으로서 성격특성에 주목할 필요가 있으며, 아울러 전공을 자율적으로 선택할 수 있도록 도울 필요가 있음을 시사한다.
당뇨병이 없는 성인에서 심혈관질환 위험요소 및 대사증후군과 당화혈색소의 상관관계
김진화,최소라,이재록,신지혜,이상준,한미아,박종,배학연,김상용 대한당뇨병학회 2008 Diabetes and Metabolism Journal Vol.32 No.5
Background: Glycosylated hemoglobin (HbA1c) is a useful index of mean blood glucose concentrations over the preceding 2 to 3 months. Elevated HbA1c levels (> 7%) are associated with a higher incidence of microvascular and macrovascular complications in patients with diabetes mellitus. However, the relationship between HbA1c and cardiovascualr disease risk in nondiabetic adults has been unclear. The aim of this study is to estimate the association of HbA1c with cardiovascular disease risk factors and metabolic syndrome in nondiabetic adults. Methods: The subjects of this study included 533 adults (180 males and 353 females) aged 20~70 years (mean age: 46.9 ± 10.12 years) without previously diagnosed diabetes who lived in Kangyang country. We examined baseline HbA1c levels and cardiovascular risk factors. Metabolic syndrome was defined based on International Diabetes Federation guidelines. Results: The prevalence of metabolic syndrome significantly increased as HbA1c increased. HbA1c revealed a significant correlation with age (r = 0.258, P < 0.001), BMI (r = 0.152, P < 0.001), waist circumference (r = 0.252, P < 0.001), fasting plasma glucose (r = 0.319, P < 0.001), systolic (r = 0.100, P = 0.021), diastolic (r = 0.115, P = 0.008) blood pressure, total cholesterol (r = 0.232, P < 0.001), triglyceride (r = 0.156, P < 0.001), LDL cholesterol (r = 0.216, P < 0.001), and HDL cholesterol (r = -0.167, P < 0.001). Multiple regression analysis showed that HbA1c had a association with age, fasting plasma glucose, and dyslipidemia. The receiver operating characterstics (ROC) curve analysis determined HbA1c of 5.35% to yield optimal sensitivity and specificity corresponding to the presence of metabolic syndrome. Conclusion: The HbA1c level is correlated with cardiovascular risk factors and prevalence of metabolic syndrome in nondiabetic adults. (KOREAN DIABETES J 32:435-444, 2008) Background: Glycosylated hemoglobin (HbA1c) is a useful index of mean blood glucose concentrations over the preceding 2 to 3 months. Elevated HbA1c levels (> 7%) are associated with a higher incidence of microvascular and macrovascular complications in patients with diabetes mellitus. However, the relationship between HbA1c and cardiovascualr disease risk in nondiabetic adults has been unclear. The aim of this study is to estimate the association of HbA1c with cardiovascular disease risk factors and metabolic syndrome in nondiabetic adults. Methods: The subjects of this study included 533 adults (180 males and 353 females) aged 20~70 years (mean age: 46.9 ± 10.12 years) without previously diagnosed diabetes who lived in Kangyang country. We examined baseline HbA1c levels and cardiovascular risk factors. Metabolic syndrome was defined based on International Diabetes Federation guidelines. Results: The prevalence of metabolic syndrome significantly increased as HbA1c increased. HbA1c revealed a significant correlation with age (r = 0.258, P < 0.001), BMI (r = 0.152, P < 0.001), waist circumference (r = 0.252, P < 0.001), fasting plasma glucose (r = 0.319, P < 0.001), systolic (r = 0.100, P = 0.021), diastolic (r = 0.115, P = 0.008) blood pressure, total cholesterol (r = 0.232, P < 0.001), triglyceride (r = 0.156, P < 0.001), LDL cholesterol (r = 0.216, P < 0.001), and HDL cholesterol (r = -0.167, P < 0.001). Multiple regression analysis showed that HbA1c had a association with age, fasting plasma glucose, and dyslipidemia. The receiver operating characterstics (ROC) curve analysis determined HbA1c of 5.35% to yield optimal sensitivity and specificity corresponding to the presence of metabolic syndrome. Conclusion: The HbA1c level is correlated with cardiovascular risk factors and prevalence of metabolic syndrome in nondiabetic adults. (KOREAN DIABETES J 32:435-444, 2008)