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민원·환경관리가 현장원가에 미치는 영향 연구 - 정부대구지방합동청사 중심으로 -
김창신,동재욱 청운대학교 건설환경연구소 2012 청운대학교 건설환경연구소 논문집 Vol.7 No.2
Recently, the congestion of cities make many problems such as noise, sunlight, construction dust and traffic jam. Therefore, there are a lot of complaints between construction field and neighborhood. This study aimed to seek the effective solution to reduce the construction cost by environment managements. For this study, the laws and popular complaints were analyzed focusing on the documents in Daegu city from 2007 to 2011. As a result, Most of construction site still lack abilities in environmental management cost, various inspection, Consequently, it is the core key to deal with those construction complaints as an efficient through computerization, not an environment management and taking foster various fields of professional, It has to fulfill the supporting activity for the successive work in this mood chasing more pleasant life condition. 최근 도시의 과밀화는 소음, 일조, 공사 먼지 및 교통 혼잡 등의 다양한 문제점을 야기하고 있으며 공사 현장과 이웃 간에 많은 문제점이 나타난다. 이 연구는 환경 관리를 통해 이러한 문제점들을 효과적으로 해결하여 공사원가를 낮추는데 그 목적이 있다. 이 연구를 위해 2007년부터 2011년까지 대구시를 중심으로 한 법률과 민원들이 연구되었으며 그 결과 대부분의 건설현장에서 환경관리가 부족함이 드러났다. 결론적으로 이러한 건설민원 문제를 효과적으로 다루는 것은 기존의 환경관리가 아닌 전산화를 통해 효율화시키고, 각 분야의 전문가를 육성하여 신규 착공현장에 대한 지원활동을 수행 하도록 하여 보다 쾌적한 삶을 추구하고 성공적인 건설 업무를 위한 필수적인 일이라고 할 수 있다.
김창신,이영식 경희대학교 자연과학종합연구원 1999 자연과학논문집 Vol.5 No.-
H_(2)…CO 반 데르 발스 복합체는 H_(2)…H_(2)와 같이 매우 약하게 결합하는 복합체이다. 이미 Mckellar 등에 의해 이합체의 낮은 해상도를 이용한 스펙트럼이 보고되었지만, H_(2)…CO 반 데르 발스 복합체는 구조는 아직 규명되지 않았다. 본 논문에서는 전자 밀도 범함수론, 선험적 방법을 이용해서 가능한 구조를 예측했고, 최소 에너지, 최적화된 구조와 조화진동수를 계산하였다 다양한 계간 방법으로 결과를 비교하였는데 최적화된 구조는 선형구조와 중심축을 기준해서 약 20도 휜 구조였다. 이미 연구되어진 H_(2)…H_(2)의 결과와 비교해 보았다. The H_(2)…CO is a weakly bound van der Waals complex like H_(2)…H_(2). The low resolution spectra of the dimer was previously reported by Mckellar et. al.. However, the structure of the dimer is not finalized yet. In this study, the possible structures are studied with DFT, MP2 and high level calculations. The minimum energy, optimized geometry, and vibrational frequencies are also calculated. Results of various calculations are compared each other. The collinear and bent conformation are three possible optimal structure. The results from previous study on molecular hydrogen dimer were also compared.
Myocardial Rotation and Torsion in Child Growth
김창신,박소라,은영민 한국심초음파학회 2016 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.24 No.3
Background: The speckle tracking echocardiography can benefit to assess the regional myocardial deformations. Although,previous reports suggested no significant change in left ventricular (LV) torsion with aging, there are certain differences in LV rotationat the base and apex. The purpose of this study was to evaluate the change and relationship of LV rotation for torsion withaging in children. Methods: Forty healthy children were recruited and divided into two groups of twenty based on whether the children were preschool-age (2–6 years of age) or school-age (7–12 years of age). After obtaining conventional echocardiographic data, apical and basalshort axis rotation were assessed with speckle tracking echocardiography. LV rotation in the basal and apical short axis planes wasdetermined using six myocardial segments along the central axis. Results: Apical and basal LV rotation did not show the statistical difference with increased age between preschool- and schoolagechildren. Apical radial strain showed significant higher values in preschool-age children, especially at the anterior (52.8 ±17.4% vs. 34.7 ± 23.2%, p < 0.02), lateral (55.8 ± 20.4% vs. 36.1 ± 22.7%, p < 0.02), and posterior segments (57.1 ± 17.6% vs. 38.5 ± 21.7%, p < 0.01). The torsion values did not demonstrate the statistical difference between two groups. Conclusion: This study revealed the tendency of higher rotation values in preschool-age children than in school-age children. The lesser values of rotation and torsion with increased age during childhood warrant further investigation.
전자 밀도 범함수론을 이용한 수소 분자 이합체에 대한 연구
김창신,이영식 경희대학교 자연과학종합연구원 1998 자연과학논문집 Vol.4 No.-
Gaussian 94 package 와 전자 밀도 범함수론을 이용하여 우주 공간에서 발견된(H_(2))_(2)의 구조와 정규모드 진동수를 계산하였다. 본 연구 결과를 이미 보고된 ab initio의 계산 결과와 비교하였고, 이를 토대로 실험적으로 구해진(H_(2))_(2)의 여러 정규모드 진동수를 이론적으로 예측하였다. 그 결과 반 데르 발스 복합체의 구조와 에너지를 계산하는데 전자밀도 범합수론이 ab initio의 계산방법과 유사한결과를 제공하였다 따라서 전자 밀도 범함수론을 이용한 계산 방법이 반 데르 발스 이합체의 물리적 성질을 예측하는데 경제적이면서도 효과적인 것을 알 수 있었다. Molecular hydrogen dimer, (H_(2))_(2) was studied using GAUSSIAN 94 package and density functional theory (DFT). Calculated results on structures, total energy, dimerization energy, and vibrational frequencies were compared to those obtained by ab initio calculations. Calculated vibrational frequencies were compared with experimental observations. DFT method was successfully describe the physical properties of hydrogen van der Wads complex. It suggests that DFT method is economical and efficient method for computational studies.
김창신,김상준,이용식,김용호,Kim, Chang Sin,Kim, Sang Jun,Lee, Yong Sik,Kim, Yong Ho Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.5
Molecular hydrogen dimer, ($H_2)_2$ is a weakly bound van der Waals complex. The configuration of two hydrogen molecules and the potential well structure of the dimer have been the subjects of various studies among chemists and astrophysicists. In this study, we used DFT, MCG2, and MCG3 methods to determine the structure and energy of the molecular hydrogen dimer. We compared the results with previously reported ab initio method results. The ab initio results were also recalculated for comparison. All optimized geometries obtained from the MP2 and DFT methods are T-shaped. The H-H bond lengths for the dimer are almost the same as those of monomer. The center-to-center distance depeds on the levels of theory and the size of the basis sets. The bond lengths of the $H_2$ molecule from the MCG2 and MCG3 methods are shown to be in excellent agreement with the experimental value. The geometry of optimized dimer is T-shaped, and the well depths for the dimerization potential are very small, being 23 $cm-^1$ and 27 $cm-^1$ at the MCG2 and MCG3 levels, respectively. In general the MP2 level of theory predicts stronger van der Waals than the DFT, and agrees better with the MCG2 and MCG3 theories.