갑상선 질환에서의 부여포세포 표현 양상

기근홍,이학봉,신은택 조선대학교 부설 의학연구소 1998 The Medical Journal of Chosun University Vol.23 No.2

The parafollicular C cell is a neuroendocrine cells in the thyroid gland. It secrete the calcitonin and regulate the serum level of calcium. The materials for this study consisted of 20 cases of adenomatous goiter 10 chronic lymphocytic thyroiditis, 5 Hashimoto's thyroiditis, 10 follicular adenoma, 20 papillary carcinoma, and 5 follicular carcinoma that resected for definite treatment of thyroid disease at Chosun University Hospital from January, 1995 to December, 1998. All cases were performed of immunohistochemical stain for antimouse monoclonal calcitonin, chromogranin A and neuron-specific enolase (NSE) antibodies. The result obtained as follows. Immunohistochemically, the positive cells for calcitonin, chromogranin A and calcitonin were increased and intensely stained in the chronic lymphocytic thyroiditis and Hashimoto's thyroiditis. In the follicular adenoma, papillary carcinoma and follicular carcinoma, the C cells were increased around the tumor cell nests. But, the tumor cells showed negative staining. In conclusion, the calcitonin-producing neuroendocrine cells were showed in most thyroid diseases and were increased in inflammatory diseases. This finding suggest that the neuroendocrine cells act as protection to injurious agents or neoplastic transformation.

Rare Earth Oxalate Hydrate의 構造變化에 關한 硏究(Ⅱ)

丁學鎭,丁梧鎭,宋基東 조선대학교 기초과학연구소 1984 自然科學硏究 Vol.7 No.1

희토류 옥살산 수화물 및 각 전이점 이후까지 가열하여 얻은 옥살산 시료들의 구조를 원소분석치, 시차열분석법, 열중량분석법, X선회절법 및 전자현미경법으로 연구하였다. 각 희토류는 옥살산 수화물 시료들은 공기중에서 293∼427℃ 사이에서 완전탈수 되어 단사정계 결정에서 무정형의 무수염으로 변한다. 이들 무수물은 346∼698℃ 사이에서 R_2O_2CO_3로 상변화가 생기며 720∼885℃에서 희토류 산화물로 분해된다. 각 희토류 옥살산 수화물의 전이온도와 희토류원소의 원자번호와는 아무런 관계가 없었다. The rare earth oxalate hydrates were synthesized by precipitation method at room temperature. These have the general formula, R_2(C_2O_4)_3. XH_2O. The structures of the hydrates and compounds ignited at each transition temperature have been investigated by analytical data of carbon and hydrogen, differential thermal analysis(DTA), thermogravimetric analysis (TGA) and X-ray diffraction method. The TGA results were similar to all the lanthanides and the DTA results were almost entirely different according to the heating conditions. The lanthanide hydrates lost water in air at the range of 200∼347℃ and monoclinic crystal became the stable anhydrous salt. These anhydrous salts were decomposed into R_2O_2CO_3 at the range of 380∼600℃. The rare earth oxycarbonates have begun to decompose into the rare earth oxide at 600∼885℃. We found that atomic numbers of rare earth elements were not related with each transitional temperatures.

AIGaAs/GaAs 계면특성분석

정학기 群山大學校 1990 論文集 Vol.17 No.-

This theses analyzed physical and electrical characteristics of MODFET using two-dimensional electron gas layer of AlGaAs/GaAs interface as channel by particle simulation algorithm. This method called Monte-Carlo algorithm has the advantage that is to consider precisely physical characteristics to analyze the electric characteristics of simulating devices. Also the method has to use many particle to lessen the error(??) of the particle simulation, but this simulation uses 5000particles in error by 5 percent. FDM is used to solve two-dimensionally the Poisson's equation to 50 by 50 finite meshes and resultly to obtain the electron distribution and potential distribution. The potential energy distribution and electric field are considered by using the physical results of particle simulation of particle occupancy, scatterings, propagation constants and particle energy under applied bias. The electron-electron scattering mechanism not to be required in MESFET simulation has to be considered in MODFET particle simulation, because it is conformed that electron-electron scattering has not to be ignored as compared with the result that the electron-electron scattering is not contained.

壓縮比 變化에 따른 CI機關의 熱發生率 및 機關性能에 關한 實驗的 硏究

鄭仁基,金重燁,金學洙,金壽淵 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.2

The study on the heat release and the engine performance of CI engine is experimentally performed with variation of compression ratio and inlet pressure. In this experiment, compression ratio in cylinder is decreased and inlet pressure is increased. The results of this study are as follow: the thermal efficiency increases and the maximum combustion pressure decreases as compression ratio declines and inlet pressure rises. For the case of the same mean effective pressure, specific fuel consumption and smoke become to be low. According to the results, the advantages are achieved for the noise, vibration, performance and smoke.

Polysulfide 前處理에 의한 Cyanide 含有廢水의 活性汚泥處理

金承鶴,李武康,韓基白 慶星大學校 環境問題硏究所 1992 環境硏報 Vol.2 No.1

The objective of this study was performed in order to obtain the changing efficiency of SCN- according to and reaction time. For that reason, the polysulfide was added to the cyanide wastewater in a fixed weight ratio. Herewith the design parameter was determined for the synthetic wastewater containing 300㎎/ℓof SCN- and was compared substrate removal constant(k) with adsorption reaction constant(k₁k₂) by adsorption equilibrium eqtion. The changing rate of CN- to SCN- was found to be pH 10, pH 12 for 90∼95 percent within 3 hours. On other hand, was found to be pH 7 for 60∼65 perdent due to the Polysulfide precipitating. On the occasion of 10, after the reaction time proceeded 3 hours, pH of bulk solution was varied from 10 to 7. But practically changing of SCN concentration was not significant. Treatment of the synthetic wastewater containing 300㎎/ℓof SCN- at 20±1℃ with the Hydraulic retention tin of 6 to 18 and MLVSS concentration of 3050 to 3590㎎/ℓgave 94.2∼96.5 percent in substrate removal efficiencies as COD . The design parameters of k, Y, ke, Vmax and Km were determined to 0.0247 d-1, 0.2119, 0.0561 d-1, 4 d-1, and 153.96㎎/ℓ. In adsorption teste using acclimated sludge, adsorption removal rate was 0.5476㎎/㎎ MLVSS. day at 314㎎/ℓ initial SCN- concentration and was 0.3045㎎/㎎ MLVSS·day at 576㎎/ℓ of initial SCN- concentration. It was adapted adsorption equilibrium equation for substrate removal by the activated sludege. In the results, Freudlich's adsorption reaction constant, k₁ was 0.0273 day-1 and n₁was 0.840 and Katz's adsorption reaction constant, k₂ was 0.0287 day-1 and n₂was 0.839. These values were similar in comparison with the substrate removal constant(k=0.247).

LASOB 상에서 후위 변환과 트리 디코딩에 대한 효율적인 병렬 알고리즘

김영학,이기수 金烏工科大學校 1999 論文集 Vol.20 No.-

The linear array with slotted optical buses (LASOB) has recently been proposed for high-performance computing. In this paper, we present efficient parallel algorithms for postfix transformation and tree decoding on linear arrays with slotted optical buses. Our algorithms run in constant time on LASOB, using processors equal to the input size for each problem, and also are optimal in the sense that the product of time and number of processors is asymptotically the same as the optimal sequential time.

Salmonella sp.의 신속한 동정을 위한 증진배양의 개선에 관한 연구

김기태,김태우,옥순학,이영호,백운화 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.6

식품 및 생활폐수내의 존재하는 Salmonella spp.에 대한 효율적이고 신속한 동정을 위한 증진배야업을 개발하고자 하였다. 본 연구에 사용된 균주인 S. enteritidis 생육을 촉진시키기 위한 방법으로 cAMP 및 yeast extract를 사용하였는데 전자인 경우는 배지내의 농도가 10 mM 이상일 때 10^-3 cfu/ml의 균수로 7시간 배양후 균수가 control보다 약5배의 증가를 보였으며 후자인 경우는 0.6% 첨가시 10배의 증가를 보였다. 다른 균주들에 대한 선택적인 성장효과를 보기위하여 selenite broth와 bile salts를 사용하였고 이때 사용된 균주는 Staphylococcus aureus, Pesudomonas aeruginosa, Lactobacillus plantarum 및 Escherichia coli이었고 bile salts의 농도가 0.1%일때 네 가지 균주의 증식에 대한 억제 효과가 있었다. 두 단계의 증진배양법으로서 1차 증진배양에서는 selenite broth에 0.6% yeast extract를 첨가한 것으로 2차 증진배양에서는 0.1% bile salts를 첨가한 것으로 하였는데 타균과의 혼합배양에서 Salmonella의 초기균수가 10^0.3일 때 14시간 증진배양으로 10^8.5 cfu/ml까지 증식을 보였으며 초기균수가 1 cfu/100 ml인 경우는 10시간의 1차 증진배양과 6시간의 증진배양으로 약 10^7의 증식속도를 나타내었다. The development of an enrichment method for the rapid and effective identification of Salmonella spp. in sewage or food was studied. As a growth factor for Salmonella, 10 mM cyclic adenosine monophosphate (cAMP) in trypticase soy broth with 0.6% yeast extract (TSBYE) increased cell number five-folds and 0.6% yeast extract in selenite broth increased cell number ten-folds of control. Bile salts in slenite broth was tested for the selection of S. enteritidis in a mixture with Staphylococcus aureus, Pesudomonas aeruginosa, Lactobacillus plantarum and Escherichia coli. The latter four strains were effectively inhibited at 0.1% bile salt. A two-step culture method was used to enrich Salmonella spp.; a primary-enrichment and secondary-enrichment culture. At a primary-enrichment step, selenite broth with 0.6% yeast extract and 10 mM cAMP was used, and at a secondary-enrichment step, -0.1% bile salt was additionally used. Culture times of a primary-enrichment and a secondary-enrichment step were 8 hr and 6 hr, respectively. In this procedure, cell number increased from 10^0.3 to 10^8.5 with inhibition of other strains within 14 hr. In the case of an initial cell concentrarion as low as 10^-2 cfu/ml, a cell number increased to 10^7 cfu/ml by using a 10 hr primary-enrichment and 6 hr secondary-enrichment procedure.

성공적인 경피적 승모판 교련절개술 후 임상 경과와 재협착율

김영학,강덕현,송재관,최기준,이철환,홍명기,김재중,박성욱,박승정 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.2

초내열 합금 Alloy718의 저주기 피로시험에서 반복연화 및 R=X (X=0,-1)효과

최병학,신수근,신정근,김선화,윤기봉,염종택,박노광 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

The LCF properties for R=0 as tension-tension and R=-1 as tension-compression were examined in DA alloy718. While the hysteresis loops composed of ?ε_(t), ?ε_(p) and ?σ were figured with similaity in both of R=0 and R=-1, the loops of R=0 were continuely going down along the stress axis during cyclic fatigue progressing. It was caused by Bauschinger effect, which includes a tendancy for stress recovering as an amount of compression stress. The phenomena of cyclic softening in both of R=0 and R=1 seem to be caused by planar slip of dislocations, which was accompanied by shearing the γ'/γ" precipitates during the cyclic fatigue test.

포도에 대한 Captafol 수화제의 안전사용기준 설정

李載球,慶箕性,金學南 충북대학교 농업과학기술연구소 1993 農業科學硏究 Vol.11 No.1

In order to establish the criteria for the safe use of the fungicide captafol on grapes, 12 plots with different spray frequency and different spray time were placed and sprayed on stems and leaves with the captafol wettable powder up to 3, 7, 15, 30, 45, 60 days before harvest. The results of the analysis of captafol residues on the sample grapes were as follows : 1- Recovery values obtained from fortified control samples were 85.3 and 90.0%, respectively, at the 0.1 and 1.0 ppm levels, the detection limits being 0.06 ng(0.015 ppm). 2. Captafol residues were detected in all samples, ranging from 0.25 to 5.79 ppm. 3. Captafol residues had a tendency to become the more, the more spray frequency and the closer spray time to harvest. 4. The captafol residues on grapes were within the maximum residue limits in the samples sprayed 4 times involving those sprayed up to 3 days before harvest, whereas the residues in the samples sprayed 5 times were beyond the limits. 5. It was recommended that the captafol WP should be sprayed on grapes 4 times up to 7 days before harvest.