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이남훈,노윤환,정윤식 한국자료분석학회 2018 Journal of the Korean Data Analysis Society Vol.20 No.5
Based on progressive type-II censored samples, the MLEs (maximum likelihood estimators) and Bayes estimators for the four parameters, alpha, beta, a and b of BLLog (beta log-logistic) distribution are derived. The MLEs are found by Newton-Raphson method and bootstrap method. Then we show the conditions of existence of MLEs of the four parameters. Also, we used MCMC methods for obtaining their Bayes estimates. In simulation study, as expected, the RMSEs of all estimators decrease as a sample size increases. For the fixed sample size, the mean squared error typically increases as the number of censored data increases. Also, Bayesian estimators are better than MLE and bootstrap estimators in terms of the values of their corresponding RMSEs, SE (standard error)s and lengths of confidence intervals.
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Fabrication details of Ba1-xKxFe2As2 films by pulsed laser deposition technique
이남훈,정순길,RANOTMAHIPAL,강원남 한국초전도.저온공학회 2014 한국초전도저온공학회논문지 Vol.16 No.3
Among Fe-based superconductors, potassium doped BaFe2As2 is favorable for applications because of its relatively hightransition temperature and low anisotropy. To study the superconducting properties and the applicable aspects, high quality thinfilms of potassium doped BaFe2As2 should be fabricate. However, the high volatility of potassium makes it difficult to fabricate thinfilms of this compound. In this paper, we discuss the details of the experimental conditions used to fabricate Ba1-xKxFe2As2 films byex situ PLD method. In the first set of samples, barium ratio in the target was controlled to make films with various potassiumdoping rate. However, in the second set of samples, the amount of potassium was controlled to find out optimal conditions formaking high quality Ba1-xKxFe2As2 films
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벽면효과가 플래핑 날개의 성능에 미치는 영향에 대한 유체-구조 결합 해석
이남훈,이승수,조해성,신상준 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.4
본 논문에서는 벽면효과가 유연한 플래핑 날개의 성능에 미치는 영향에 대해 알아보기 위해 유체-구조 결합 해석을 수행하였다. 유동 해석을 위해 유한 체적법에 기반한 예조건화 된 Navier-Stokes 해석자를 사용하였다. 또한 구조 해석을 위해 비선형 구조 모델에 기반한 기하학적 정밀 보 정식화를 사용하였다. 벽면 효과가 해석 결과에 미치는 영향에 대해 알아보기 위해 실험 결과 및 벽면 고려 여부에 따른 수치해석 결과를 비교하였다. In this paper, a computational approach to simulate flapping wings by coupling between CFD and CSD is presented. For the aerodynamic analysis, a finite volume based preconditioned Navier-Stokes solver is used. For the structural analysis, meanwhile, a non-linear structural model based on the geometrically exact beam formulation is used. In this paper, we investigate the wall boundary effect on the numerical results and the present results are compared with those obtained in the previous numerical and experimental results.
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Calabi--Yau threefolds from building blocks of $G_2$-manifolds
이남훈 충청수학회 2017 충청수학회지 Vol.30 No.3
We construct Calabi--Yau threefolds by smoothing normal crossing varieties, which are made from the building blocks of $G_2$-manifolds. We compute the Hodge numbers of those Calabi--Yau threefolds. Some of those Hodge number pairs $(h^{1,1}, h^{1,2})$ do not overlap with those of Calabi--Yau threefolds constructed in the toric setting.
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이남훈,민성길,오경자,송현주,변경민,고려원,김태경,장지흠 대한신경정신의학회 2003 신경정신의학 Vol.42 No.5
Objectives:This study was designed to identify frontal lobe dysfunctions of schizophrenic group and to classify into subtypes accordingly. Methods:Four neuropsychological tests (Wisconsin Card Sorting Test (WCST), Word Fluency Test, Ruff Figural Fluency Test and Grooved Pegboard Test) were administered to 93 schizophrenia or schizophreniform patients diagnosed with the Korean version of SCID. Ten measures (WCST Total Number of Errors, WCST Number of Categories Completed, WCST Conceptual Level Responses, WCST Trials to Complete First Category, WCST Perseverative Responses, GPT Dominant Hand RT, GPT Nondominant Hand RT, Letter Fluency raw score, Category Fluency raw score, RFFT Total Unique Designs) from the four tests were selected by statistical procedure. Latent factors embedded in the frontal lobe function of schizophrenic patients were extracted from the factor analysis, and hierarchical and K-means clustering procedures were used to identify subtypes. To examine the differences among the subtypes, demographic variables, K-WAIS and PANSS were used. Results:① The subjects in this study showed significant impairments in the four neuropsychological tests. ② Through factor analysis, three factors were extracted: Conceptualization, Motor and Fluency. ③ Three cluster solution was considered optimal by cluster analysis. The preserved cluster (n=42) comprised of patients who showed relatively high function in all three factors. This group showed relatively higher function than the other two clusters. However, even the performance of the preserved cluster was 1SD below the norm of the normal people. The conceptualization deficit cluster (n=25) comprised of patients with deficit in conceptualization function. This group was characterized by the clinical symptoms of poor impulse control and active social avoidance suggesting a deficit in the ability to actively organize stimuli utilizing the feedback from the external environment. And finally, the fluency deficit cluster (n=19) showed impairment in fluency. This group was characterized by impairments in the use of abstract-symbolic thinking and the ability to pay attention to relevant stimuli suggesting a severe deficit in the efficiency and flexibility of information withdrawal. These three subtypes didn’t differ significantly in age, duration of illness and current dosage of antipsychotics. However, the three groups differed significantly in years of education, IQ and on five items of PANSS. Conclusion:This study shows that schizophrenia can be characterized by frontal lobe dysfunctions and divided into three subtypes according to the profile of the frontal lobe dysfunctions. These neurocognitive heterogeneity of schizophrenia, not related to age, duration of illness and dosage of antipsychotic, suggest that different strategies need to be developed in diagnosing and planning rehabilitation programs for schizophrenc patients
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초등학교 병설유치원의 건축계획에 관한 조사 연구(광주광역시 병설유치원을 중심으로)
이남훈,주석중 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
The purpose of this study is to improve environmental quality of elementary school-affiliated kindergarten, to minimize the time and effort required in the design and construction of kindergarten by providing architectural planning guideline. This study is based on some surveys such as interview and questionaries on teachers and the survey of actural condition of building arrangement, plane, room, facilities, and so on. And the sample of this survey was selected by 23 Kindergartens in Gwang-ju urban areas.
KCI
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