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김형진 대한교통학회 1996 大韓交通學會誌 Vol.14 No.1
This paper is concerned with assessing goodness of fit of gravity models. The Chi-square test, or one of its asymptotic equivalents, is usually recommended for the purpose. A difficulty that frequently arises, particularly when working with urban travel data, is that the expected number of trips for most origin-destination(O-D) pairs are small. In order to test goodness of fit of gravity model, a simple approach, which depends on the number of O-D pairs and certain trip totals being large, is proposed in this paper. In addition, derivation of variance of Chi-square ratio is proposed to test the confidence interval of Chi-square ratio and application of its results with simulated data set is made to verify the usefulness of the results.
김형진,김미리,박진경,이용제,박병진 대한가정의학회 2018 Korean Journal of Family Medicine Vol.39 No.5
Background: Epidemiological studies suggest that serum calcium levels correlate with cardiovascular events. An ankle-brachial index (ABI) between 0.9 and 1.00 is a surrogate estimation of preclinical peripheral arterial disease (PAD). Prior studies have shown that an ABI of 0.9–1.0 is also associated with endothelial dysfunction. Therefore, we sought to investigate the relationship between serum calcium levels and preclinical PAD in apparently healthy Korean individuals.Methods: We evaluated the association between serum calcium levels and preclinical PAD in 596 participants (334 males, 262 females) in a health examination program. Preclinical PAD was defined by an ABI of 0.9–1.0. Multiple logistic regression analysis was used to determine whether the serum calcium level was an independent determi-nant of preclinical PAD.Results: The overall prevalence of preclinical PAD was 14.3%. The mean age was 44.0±12.5 years in the non-PAD group and 48.3±11.4 years in the preclinical PAD group (P=0.001). After adjusting for age, gender, systolic blood pressure, fasting plasma glucose, high-density lipoprotein cholesterol, triglycerides, C-reactive protein, g-glutamyl-transferase, uric acid, hypertension medication, diabetes medication, and hyperlipidemia medication, the odds ra-tio (95% confidence intervals) for preclinical PAD was 2.28 (1.02–5.11) with a 1-mg/dL increase in the serum calci-um.Conclusion: These findings suggest that increased serum calcium is independently and positively associated with preclinical PAD regardless of the presence of classic cardiovascular risk factors.
골프 참여자의 웰빙지향행동과 운동열정 및 건강지각의 관계
김형진,최석환,김동기 한국골프학회 2016 골프연구 Vol.10 No.2
본 연구는 서울, 경기, 대전, 세종, 대구지역에 소재한 골프연습장 이용객을 대상으로 골프참여자의 웰빙지향행동과 운동열정 및 건강지각에는 어떠한 관계가 있는지를 규명하는 데 목적을 두고 진행되었다. 본 연구의 목적을달성하기 위하여 SPSS 18.0과 AMOS 18.0을 이용하여 빈도분석, 탐색적 요인분석, 확인적 요인분석, 신뢰도분석과상관관계분석을 실시하였고 모형을 설정한 뒤 구조방적식모형(SEM)을 통하여 변인간의 인과적 관계를 규명하였다. 이상과 같은 연구방법과 연구모형 검증을 기초로 하여 본 연구에서 도출된 결과는 다음과 같다. 첫째, 골프참여자들의 웰빙지향행동은 조화열정에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 골프참여자들의 웰빙지향행동은 건강지각에 영향을 미치지 않는 것으로 나타났다. 셋째, 골프참여자의 웰빙지향행동은 강박열정에 영향을미치지 않는 것으로 나타났다. 넷째, 골프참여자의 조화열정은 건강지각에 긍정적인 영향을 미치는 것으로 나타났다. 다섯째, 골프참여자의 강박열정은 건강지각에 부정적인 영향을 미치는 것으로 나타났다. The purpose of this study is to investigate the relationships among well-being-oriented behavior, passion and health-perception of golf participants. The subject for this research consisted of 222 customers who took a golf lesson in golf driving ranges around Seoul, Gyeonnggi, Daejeon. Sejong and daegu. The data were analyzed by frequency analysis, reliability analysis, exploratory factor analysis, confirmatory factor analysis, correlation analysis, and structural equation modeling using SPSS Version 18.0. and Amos 18.0 program. Main findings were as follows: First, well-being-oriented behavior had a positive effect on exercise passion(harmonious passion). Second, well-being-oriented behavior had not effect on health-perception. Third, well-being-oriented behavior had not effect on exercise passion(obsessive passion). Fourth, exercise passion(harmonious passion) had a positive effect on health-perception. Fifth, exercise passion(obsessive passion) had a negative effect on health-perception.
Open Bronchus Sign on CT: A Risk Factor for Hemoptysis after Percutaneous Transthoracic Biopsy
김형진,박창민,윤순호,황의진,이종혁,안수연,구진모 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.5
Objective: We hypothesized that open bronchi within target pulmonary lesions are associated with percutaneous transthoracic needle biopsy (PTNB)-related hemoptysis. We sought to analyze and compare patient characteristics and target features as well as biopsy-related factors between patients with and without PTNB-related hemoptysis. Materials and Methods: We retrospectively analyzed 1484 patients (870 males and 614 females; median age, 66 years) who had undergone 1569 cone-beam CT (CBCT)-guided PTNBs. Patient characteristics (sex, age, and pathologic diagnosis), nodule features (nodule type, size, location, and presence of an open bronchus in target nodules), and biopsy-related factors (biopsy needle size, pleura-to-target distance, blood test results, open bronchus unavoidability [OBU] index, etc.) were investigated. OBU index, which was assessed using the pre-procedural CBCT, was a subjective scoring system for the probability of needle penetration into the open bronchus. Univariate analysis and subsequent multivariate logistic regression analysis were conducted to reveal the independent risk factors for PTNB-related hemoptysis. For a subgroup of nodules with open bronchi, a trend analysis between the occurrence of hemoptysis and the OBU index was performed. Results: The independent risk factors for hemoptysis were sex (female; odds ratio [OR], 1.918; p < 0.001), nodule size (OR, 0.837; p < 0.001), open bronchus (OR, 2.101; p < 0.001), and pleura-to-target distance (OR, 1.135; p = 0.003). For the target nodules with open bronchi, a significant trend between hemoptysis and OBU index (p < 0.001) was observed. Conclusion: An open bronchus in a biopsy target is an independent predictor of hemoptysis, and careful imaging review may potentially reduce PTNB-related hemoptysis.
반사광 측정 모드에서 금과 은을 사용한 이층 금속 칩과 삼층 금속 칩의 특성 연구
김형진,김창득,손영수,Kim, Hyungjin,Kim, Chang-duk,Sohn, Young-Soo 한국센서학회 2016 센서학회지 Vol.25 No.2
Characteristics of the conventional gold (Au) surface plasmon resonance (SPR) chip, bi-metallic(Au/silver (Ag)) SPR chip, and tri-metallic(Au/Ag/Au) SPR chip were investigated and compared in the intensity measurement mode for the enhancement of SPR image sensor reactivity. Reflectance curves of the Au, bi- and tri-metallic SPR chips were acquired in phosphate-buffered saline (PBS) solution and were compared. The line width of the reflectance curve of the bi-metallic chip was the narrowest among the three different types of the chips. Also, the tangential slope of the bi-metallic chip was steeper than those of the other chips. Various concentrations of bovine serum albumin (BSA) were utilized in the SPR experiment. As a result, among the above three chips reflectance variation value of the bi-metallic chip was the largest.