서중조건하에서의 콘크리트 충전 강관 기둥의 시공을 위한 실험적 연구

이장환,강용학,정근호,김진호,최문식,정상진 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

The basic Physical properties, Slump, Slump flow, Air content, Bleeding, and Settlement of concrete was investigated to test Characteristic of Setting and to evaluate the relation between Model specimen and Heat of hydration for construction Over the High Temperature(CFT). The objective of this study is to take the partial core after the cementation of Model specimen, test the compression intensity and analyze the relation to Test piece.

흡연에 의한 레진의 색상변화에 관한 실험적 연구

이용근,장광수,변호영 원광대학교 생체재료·매식연구소 1995 원광생체재료·매식 Vol.4 No.2

Extrinsic dental stain may cause considerable cosmetic problems. Cigarette smoking can stain intraoral restorations, and the extent of stain accumulation will very depending. on the chemical properties of materials, surface roughness and surface treatment. This laboratory investigation was designed to simulate clinical stain accumulation from smoking using a smoking chamber. The purpose of this study was to determine and compare the extent of stain on some dental resins caused by cigarette smoking using a color difference meter(CIELAB color scale). Four kinds of light cured composite resins. (ALF, EST, TPH, Z10), three kinds of acrylic denture base resins(VRS, VSC, PS2), enamel, and dentin were investigated. Resin specimens of 3 mm thickness were made according to the manufacturer's instructions and were finally polished with Microcloth(Buehler). Half of the specimens were thermocycled between 5-55 ℃ for 1,000 cycles. Enamel and dentin specimens were made by ground and polished until flat and polished. L, a and b value of specimens were measured using a Colorimeter (Model TC-6FX, Tokyo Denshoku Co.) All the specimens were initially exposed to the smoking chamber for 4 hours and then exposed an additional 4 hours. Conditions in the smoking chamber were 37℃ and 100% relative humidity. It was filled with cigarette smoke. After removal from the smoking chamber, the surface of each specimen was wiped with tissue paper and then L, a and b value of specimens were measured. After 4 hours of exposure, the discoloration of dentin and enamel was most prominent(p<0.05), and the color change of heat cured acrylic resin was the least followed by light cured composite resin. Thermocycling did not affect the amount of discoloration. The discoloration after 8 hours of exposure was significantly(p<0.05) greater than that after 4 hours, and the amount of discoloration was more than five times greater. In conclusion, 8 hours storage in a smoking chamber caused significant color change(ΔΕ). The stains were smallest on heat cured acrylic resin and light cured composite resin.

고강도 콘크리트(80MPa이상)를 이용한 콘크리트충전강관구조 적용을 위한 기초물성 연구

이장환,강용학,정근호,김진호,정상진,최문식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

One of the most important reasons that CFT is used in many conditions is by using that we can achieve the effect, which reduce the section of the member. This research purpose to find the most ideal composition, which is achieved by the investigation in the concrete's property of matter like ability of Slump, Slump Flow, Air content, Bleeding, and Settlement when the high strength of concrete which is over 80MPa is used m the CFT column.

Southern Blot Hybridization법을 이용한 악성 림프종의 면역유전형에 관한 연구

전호종,기근홍,김윤신,이미숙,이미자,장원재,장숙진,박영진,정춘해,정종훈,양성훈,이광민 조선대학교 1994 The Medical Journal of Chosun University Vol.19 No.2

Immunogenotyping using gene rearrangement analysis has emerged as a precise laboratory aid in the diagnosis and classification of malignant Iymphoid neoplasms. The lineage and clonality of the malignant Iymphoid neoplasms can be identified by the demonstration of rearrangements of antigen receptor genes of the immunoglobulin and T-cell receptor genes. The analysis of the gene rearrangements on the malignant Iymphoid neoplasms are also useful as a sensitive unique clonal markers to detect early recurrence in patients with malignant Iymphoid neoplasms after treatment. To analyze the sensitivity and specificity of gene rearrangements in the diagnosis of malignant Iymphoid neoplasms. 24 cases of malignat Iymphoma were examined by Southern blot hybridization using CTβ-T cell receptor β chain gene-DNA probe and JH-immunoglobulin heavy chain gene-DNA probe. The results of the immunogenotypings using Southern blot hybridization disclosed high correlation between the immunophenotyping using immunohistochemical stain with monoclonal antibodies (B-cell Iymphoma 84.2%. T-cell Iymphoma 75% ). The analysis of the gene rearrangement of the angioimmunoblastic lymphadenopathy(AILD) and unclassifiable Iymphoma using immunohistochemical stain could resolve the monoclonality and lineage . Rearranged bands to the CTβDNA probe were observed in one case out of 2 cases of AILD. One case of unclassifiable Iymphoma showed rearranged bands to the CTβ DNA probe. There were no rearrangements in reactive follicular Iymphoid hyperplasia and paracortical Iymphoid hyperplasia. In conclusion, DNA gene rearrangement study should be applied to differentiate the clonality and cell lineage in the malignant Iymphoma with indistinctive immunophenotype.

3차원 영상 재생을 위한 집적결상법에서 기본영상 획득 방법과 기본렌즈의 형태에 따른 기본영상의 특성 연구

서장일,강근호,서광범,차성도,신승호 강원대학교 정보통신연구소 2006 정보통신논문지 Vol.10 No.-

We have investigated the properties of an elemental image of singlet elemental lens for film and direct pick-up method, respectively. The optimized conditions, which are minimizing the distortions of the elemental image, of the elemental lens have been analyzed with the geometrical method and the comparison of the picked up images. As a result, it is down that the elemental image quality is strongly depend on not only the lens shape but also the pick-up method.

Si 기판상에 Pt(h00) 박막의 배향성장 연구

장지근,김민영,장호정,김장기 단국대학교 1997 論文集 Vol.31 No.-

Pt thin films with the thickness of about 3000Å have been deposited on the Ti/SiO_2/Si structures in a variety of process conditions by DC magnetron sputtering method followed by the in-situ annealing at 500℃ for 30 minutes and/or the rapid thermal annealing at 650℃ for 20 seconds. As the result of experiments, only the Pt films deposited at room temperature in the atmosphere of Ar showed the [200] preferred orientation after the in-situ annealing regardless to the following rapid thermal annealing The XRD analysis exhibited the orientation rate of 53% with FWHM of 0.6° for the (200) peak in the in-situ annealed sample deposited at room temperature and Ar ambient showing a little increase of the [200]-orientation rate according to the following rapid thermal annealing. From the SEM micrographs, the as-deposited Pt films was observed after post-annealing.

CFT구조용 초고강도 충전 콘크리트의 현장 적용을 위한 실험적 연구

이장환,남정민,정근호,김진호,정상진,최문식 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

Due to social problems such as the increasing of land price and the expanding of city, buildings require more complex and bigger components and structure. However, the complex and massive building projects need new technology to solve effect of local buckling and the needs for more space. Hence, Concrete Filled Tube Steel (CFT), the tube steel to hold concrete during pouring and curing of concrete procedure, which helps to reduce local buckling and space, was developed. Most researches on CFT might not be focused on the characteristic of concrete filled in tube but structural analysis. However, it is the essential factor to increase the strength of concrete on CFT for having efficient results. Therefore, this paper will describe how to apply CFT into the construction site through examining High Strength Concrete (800kg/cm2), the strength of core, and bleeding during pouring strategy.

디메칠포름아미드에 의한 간기능 장해에 관한 연구

강성규,장재연,이경용,정호근 大韓産業醫學會 1991 대한직업환경의학회지 Vol.3 No.1

To investigate the liver dysfunction among workers exposed to dimethylformamide, 24 workers were examined on the liver transaminases and the urine metabolite. The results were as follows: 1. Nine of 24 workers examined had abnormal values in serum aspartate aminotransferase(AST), 5 in serum alanine aminotransferase (ALT), 1 in Υ-glutamyl transferase(Υ-GT). The possibilties of hepatitis due to other causes were excluded by the viral serologic tests and other results. 2. The urinary excretion values of N-methylformamide(NMF), metabolite of dimethylformamide(DMF) were over biological exposure index(BEI) in 4 of 24 workers. 3. The air concentration of dimethylformamide was over threshold limit values(TLV-TWA) in 1 of 5 workers sampled by personal air sampler. 4. The correlation coefficients between age, working part and the values of liver transaminases were not statistically significant.

유방에서 기원된 전이성 췌장암종 1예 : A case report

김윤신,이미숙,장원재,임성철,기근홍,전호종,서재홍 조선대학교 1994 The Medical Journal of Chosun University Vol.19 No.2

Pancreas is known for the unfavorable soil to the metastatic carcinoma, and pancreatic metastasis is achieved after systemic dissemination was developed. The primary tumors of metastatic pancreatic carcinoma are breast, lung, Iymphoma, malignant melanoma, leukemia, stomach. and colon. The breast carcinoma is the commonest tumor to metastasize to pancreas and both tumors are related to estrogen receptor for tumor growth. In the present case, tumor cells had small round nucleus and showed indian file infltrating pattern and lack of cohesion, which are seen in infiltrative breast carcinoma. The patient was underwent radical mastectomy due to infiltrative ductal carcinoma three years ago. And also the tumor cells showed nuclear reactivity to immunostaining for estrogen receptor In combination of the histopathologic. immunohistochemical, and her past history, we concluded that breast carcinoma was metastasized to pancreas, and we report a case of metastatic pancreatic carcinoma from breast with review of literatures.

제1형 Trichorhinophalangeal 증후군

손효성,오창근,김문범,이재봉,장호선,권경술 대한피부과학회 2003 대한피부과학회지 Vol.41 No.6

Trichorhinophalangeal syndrome(TRPS) typeⅠis characterized by sparse and slow-growing hairs, pear-shaped nose, elongated philtrum, thin upper lip, and bone deformities, especially, cone-shaped epiphyses of the phalanges. The syndrome is inherited in an autosomal dominant manner. We report a case of TRPS typeⅠ with alopecia like male pattern baldness and Perthes-like changes on the right hip joint. (Korean J Dermatol 2003;41(6) : 801~804)