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대전 3, 4 공단지역의 대기 중 PM 2.5내 미량금속의 특성
임종명,이현석,이진홍 忠南大學校 環境問題硏究所 2003 環境硏究 Vol.21 No.-
This study centered on the quantitative analysis of about 27 trace metals including toxic ones of airborne PM 2.5 in the 3rd and 4th industrial complex area of Daejeon city, Korea. For analytical quality control, the certified reference material (NIST, the National Institute of Standards and Technology, U.S.A., SRM 2783, Air particulate on filter media) was used. The errors relative to SRM values of Sb, Mn, V, Ca, Mg, Na, K, Ti, Co, Zn, and Sm fell below 5%, while those of Cr, Fe, Ba, Th, Ce, Al, and Cu were less than 10%. From the results of the quantitative analysis using INAA, the concentxation of toxic metals such as As, Mn, Se, V, and Zn were 2.40±1.99ng/m^(3), 6.54k3.15 ng/m^(3), 1.17±0.66 ng/m^(3), 1.1150.58 ng/m^(3), 52.31±25.92 ng/m^(3), respectively. If compared in terms of enrichment factors, it was found that certain elements (e.g., In, Cu, Zn, As, C1, I, Br, Sb, and Se) are enriched in PM 2.5 samples of the study site. The results of factor analysis by SPSS shows that 70.0% of total variance is well explained.
리모델링을 위한 공동주택 조립기준면의 영역성 및 위계성 설계방안에 관한 연구
임석호,송성진 대한건축학회 2003 대한건축학회논문집 Vol.19 No.7
Twenty years following their erection, the reconstruction of RC-structured apartment houses in Korea is under discussion. The life span of those houses in Korea is significantly shorter than those in other countries. For example, the average life span of similar buildings in Britain is 141 years, in France 86 years, in Germany 79 and in Japan 30 years. Repair or extensions are made for the followings reasons when there is room for a floor area ratio: economic and social reasons, life style matters, the appropriateness of the area, and limitations of functional durability. As mentioned above, the functional life is as important as the physical life. In particular, unlike other components, the life span of structure is exceptionally long and they do not age rapidly. For this reason, it is important to develop a method to maintain the components of rooms in the house in a systematical manner, serving the ultimate goal - elongating the functional life. As part of environmental-preserving policies, this study attempts to present the basic information crucial for the implementation of long-life houses by seeking MC and LC design application methods to extend the functional life of the components of the room in the apartment houses which is easy for remodeling and also to adopt zonning and hierarchy.
Genetic algorithm을 이용한 supply chain network에서의 최적생산 분배에 관한 연구
임석진,정석재,김경섭,박면웅 한국경영과학회 2003 한국경영과학회 학술대회논문집 Vol.- No.1(1)
Recently, a multi facility, multi product and multi period industrial problem has been widely investigated in Supply Chain Management (SCM). One of the key issues in the current SCM research area involves reducing both production and distribution costs. The purpose of this study is to determine the optimum quantity of production and transportation with minimum cost in the supply chain network. We have presented a mathematical model that deals with real world factors and constraints. Considering the complexity of solving such model, we have applied the genetic algorithm approach for solving this model computational experiments using a commercial genetic algorithm based optimizer. The results show that the real size problems we encountered can be solved in reasonable time.
임종명,이현석,이진홍 忠南大學校 環境問題硏究所 2002 環境硏究 Vol.20 No.-
Using INAA, which has been thought to be one of the best analytical techniques for airborne particulate matters, this study centered on the quantitative analysis of 32 metal elements within Asian Dust aerosols. Concentrations of REEs of crustal origin, such as Ce, Cs, Dy, La, Sc, and Sm were more than 8.5 times higher in Asian Dust aerosols. In addition, major crustal elements, such as Al, Ca, Co, Fe, K, Mg, Mn, and Ti showed more than 3 times higher concentrations in those aerosols, which made PM 10 and all metal concentrations be also about 3.0 and 4.8 times higher, respectively. However, concentrations of anthropogenic origin, such as As, Br, Ci, I, In, Sb, Se, and Zn were increased to be a little higher, which means no great effect of Asian Dust on these elements.
ICP-AES를 이용한 대기분진 중 중금속 분석에 대한 정도관리
임종명,이현석,이진홍 忠南大學校 環境問題硏究所 2003 環境硏究 Vol.21 No.-
In this study, factors of quality control such as laboratory environment, capability of instrument/equipment, method of analysis, calibration, and standard solution were investigated to obtain quality assurance when analyzing airborne heavy metals (e.g., Pb, Cr, Cd, Cu, Mn, Ni, Fe) using ICP-AES. A procedure of quality assurance and evaluation method of uncertainty are also suggested by applying ISO Guide. The suggested process of quality assurance will be helpful for the national monitoring network to produce better data.
임세환,송춘삼,홍석관,강정진,김주현 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
A plane strain finite element model is developed to simulate turning with continuous chip formation using adaptive remeshing during the thermal-mechanical coupled analysis. Comparisons between the experimental and simulation results for cutting forces are performed to validate FE analysis results. Influences of machining parameters such as depth of cut, cutting speed and feed rate on cuting force and shear angle are analyzed by Taguchi method. The more depth of cut and feed rate result in the increase of cutting forces, but the rates of increase are decrease due to the larger shear angle. As the cutting speed increases, von Mises stress of workpiece near the tool tip decreases because the strength of specimen decreases at high temperature above 500℃. This thermal effect on cutting force is negligible because the affected area is very localized and the average values of von Mises stress in the shear plane are the same among the diverse cutting parameters.
김진국,남태욱,임채형,김재영,김정석 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-
Traditional surgical approaches to orbital medial wall fractures are either extraocular skin incision or indirect bicoronal flap. However these methods can leave remarkable orbital scar or scalp alopecia with possible complications. Endoscopic intranasal visualization of the medial orbital wall and lamina papyracea is a technique familar to otolaryngologists. This endoscopic view allows confirmation of fracture of medial orbital wall and herniation of orbital contents. Good visualization of the fracture can facilitate the anatomic reduction of orbital contents and the proper placement of orbital implant. Two cases of medial orbital wall fracture repaired by intranasal endoscopy using silastic sheet are reported.
회전근 개 병변에서 골 단일광자방출전산화 단층촬영과 단순 방사선 사진의 비교
박진영,박선건,김승철,임종범 단국대학교 2000 論文集 Vol.35 No.-
purpose : The increased uptake on the bone scan represents the zone of increased bon metabolism. Single photon emission computerized tomography(SPECT) is more precise in detecting lesions of increased uptake than planar bone scan. The purpose of this study is to examine applicability of bone SPECT to shoulder lesions and to analyze the efficacy of SPECT compared with simple X-ray in rotator cuff lesion. Materials and Methods : Subjects were 21 patients with of rotator cuff lesion confirmed by surgical(arthroscopic or open) procedure. Increased uptake(bone SPECT) and sclerosis of greater tuberosity and anterior acromion on X-ray were considered positive. Results : For acromion, sensitivity of the bone SPECT was 90.9% and specificity was 50.0%. For greater tuberosity, sensitivity was 92.3% and specificity 37.5%. For acromioclavicular joint, sensitivity was 80.0% and specificity 81.3%. Conclusion : This study demonstrates that the uptake of radioisotope in shoulder is increased in patients with painful partial or total rotator cuff tear. And extrinsic mechanical pressure seems to be the cause of rotator cuff lesion of the shoulder.