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이남훈 안양대학교 산업기술연구소 1998 自然科學硏究 Vol.5 No.2
우리 나라의 폐기물매립지는 최근까지 매립당시부터 연탄재와 같은 토사성분을 다량 함유하고 있을 뿐 아니라 분해가능한 폐기물은 매립되어 시간이 경과하면 거의 안정화된 토양으로 환원하게 되므로 장기적으로는 토사의 점유율이 높아지게 된다. 따라서 이러한 매립토사를 선별하여 당면하고 있는 매립부지 확보난 해소와 이용 가능한 물질의 자원화를 위해 재활용하는 방안이 적극 모색되어져야 할 것이다. 본 연구에서는 폐기물매립지로부터 선별된 토사를 이용하여 자연산 복토재 구득 난 해소와 매립부지 자원화와 같은 경제적 측면뿐만 아니라 환경오염의 최소화를 위한 폐기물매립지 복토시스템 개발을 최종 목적으로, 먼저 매립지 굴착토사가 보유하고 있는 침출수중의 중금속 흡착능, 양이온 교환능 등과 같은 환경정화능을 실험적으로 평가하여 매립지 굴착토사의 활용 가능성을 제시하였다. The purpose of this study is to estimate the adsorption capacity of heavy metals with landfill-mined soil, and to assess the possibility of usage as the cover material of new landfill. The heavy metal adsorption capacity of landfill-mined soil was compared with that of the cover material of Kimpo landfill site. From this study, it has been found that landfill-mined soil is better adsorbent than the cover material, and in case of reusing the landfill-mined soil, 52~65% volume reduction of cover material for new landfill site is expected if and only if the geotechnical criteria of design and operaton of sanitary landfill are met.
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
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.
이남훈,최현진,허세형,이창희,진성민,이상혁 대한이비인후과학회 2009 대한이비인후과학회지 두경부외과학 Vol.52 No.11
Backgraound and Objectives Thyroid calcification is widely known as a highly specific sign of malignancy. However, there are few studies on the correlation between the calcification and papillary thyroid cancer (PTC). The aim of this study was to describe the features of calcification in thyroid mass, and determine the relationship between thyroid calcification and PTC. Subjects and Methods Patients (116) who underwent surgery for thyroid mass during the period of March 2006 to December 2008 were reviewed retrospectively. Each patient underwent preoperative sonography (n=96) and computed tomography (CT)(n=110) to evaluate the thyroid lesion. We subdivided the calcification according to characteristic features and compared the pathologic results. The association between the type of calcification and PTC was verified through the Chi-square test or likelihood ratio. Results Of 96 patients who underwent sonography, 41 (42.7%) had calcification, of which 23 had microcalcificaiton, 15 had focal calcification, and three had rim calcification. Of 41 calcified lesions, 34 (82.9%) were PTC. Incidence of cancer from thyroid which had no calcified lesion was 30.9%. Three (6.7%) of 45 benign lesions had microcalcification, and 20 (39.2%) of 51 were PTC. We found statistically significant correlation between the presence of calcification, especially microcalcification, on sonography and PTC. Thirty of 110 patients (27.3%) who underwent neck CT had calcification, and among them, 20 patients (66.7%) were diagnosed as PTC. There was no statistical significance in relationship between calcification on CT and malignancy. Conclusion This study suggests that microcalcification which is shown by sonography were more specific for PTC than other calcified lesions.