슬러리 매입법을 이용한 PDP용 격벽 형성에 관한 연구

金鉉成,金容奭 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-

In this study, a possibility of forming barrier ribs for the plasma display panel was explored by filling plastic mold using slurry. The mold was prepared by plastically deforming a polymeric film with a grooved roll. In preparing the mold, effects of processing parameters including rolling temperature, pressure and speed on the dimension of grooves formed were studied. For the formation of barrier ribs, slurry compositions especially contents of binder were changed to investigate their effects on the mold releasing characteristic of the rib.

항갑상선제로 치료한 그레이브스병 환자의 관해예측인자

남일송,윤여일,김선규,김용현,이주영,목지오,윤석기,김철희,김영선,변동원,서교일,유명희 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background: Most cases of Graves' disease have been treated by antithyroid drugs in Korea. The major drawbacks of antithyroid drugs are the relative high rate of relapse and the inconvinience of long term therapy. Measurement of TBII and TRH stimulation test have been considered as the most reliable tests predicting relapse, but the predictive power is not high enough to use in clinical situation. This study was performed to find good prognostic indicators in Graves' disease patients after the discontinuation of antithyroid drug therapy. Subjects and methods : We restrospectively evaluated 96 patients with Graves' disease who showed normal TRH test at the end of antithyroid drug therapy and were followed for more than one year. Serum T3, T4, T3/T4 ratio, TBII, Anti-TPO Ab and TGAb levels were measured at the time of diagnosis and at the end of therapy. Two to three months after withdrawal of antithyroid medication, serum TSH and free T3 responses to TRH were examined. These parameters were compared between the relapse group and the remission group. Results : Among the 96 patients, 22 patients(22.9%) relapsed(Group Ⅱ) and 74 patients(77.1%) remained in remmision(Group Ⅰ). No significant difference was observed between the relapse and the remission group in clinical parameters, serum T3, T4, TSH, T3/T4 ratio, TBⅡ and Anti-TPO Ab determined before and after treatment. Serum TSH and free T3 levels measured after TRH stimulation were also similar in both groups. Serum TGAb levels determined at the end of treatment were significantly higher in the remission group(p<0.05). Relapse following the discontinuation of therapy occured within 24 months in 72.7% of the relapsed cases. After 24 months, relapse rate was reduced significantly. Conclusion : These results suggest that high serum TGAb levels could be a favorable prognostic indicator for the long term remission of Graves' disease treated with antithyroid drugs, and may suggest that Hashimoto's thyroiditis is combined with Graves' disease in those patients.

비지가 발생하지 않는 두유 제조공정 및 전두유의 특성

김성란,박용곤,석호문,오승훈 한국콩연구회 2002 韓國콩硏究會誌 Vol.19 No.1

Whole soybean milk is a functional soymilk produced by mixing of soymilk and Bejee (soymilk residue) slurry. Application of enzymatic technology for disintegrating the coarse and fibrous materials in soymilk residue, and development of biomill reactor for reducing reaciton time make possible to produce new soymilk in domestic industry. Whole soybean milk is environmental affiliated product without discharging any waste such as Bejee ets. Whole soybeen milk has good taste and flavour without coarse mouthfeel induced by including Bejee particle, as well as contains more dietary fiber, protein, oligosaccharide, and other functional compounds than general soymilks. Important values of whole soybean are utilizing all nutritional properites from whole soybean without dicarding any of the insoluble solid. In this study, producing technologies and nutritional properties of whold soybean milk were investigated.

ESO 기법을 이용한 신뢰성 기반 최적설계

김상락,박재용,이원구,유진식,한석영 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-

This paper presents a Reliability-Based Topology Optimization (RBTO) using Evolutionary Structural Optimization (ESO). An actual design involves uncertain conditions such as material property, operational load and dimensional variation. Deterministic Topology Optimization (DTO) is obtained without considering of uncertainties related to the uncertainty parameters. However, RBTO involves evaluation of probabilistic constraints, which can be done in two different ways, the reliability index approach (RIA) and the performance measure approach (PMA). Limit state function is approximated using Monte Carlo Simulation and Central Composite Design for reliability analysis. ESO, one of the topology optimization techniques, is adopted for topology optimization. Numerical examples are presented to compare the DTO with RBTO.

ESO 기법을 이용한 외팔보의 신뢰성 기반 위상최적설계

김상락,박재용,이원구,유진식,한석영 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

This paper presents a Reliability-Based Topology Optimization (RBTO) using the Evolutionary Structural Optimization (ESO). An actual design involves uncertain conditions such as material property, operational load and dimensional variation. The Deterministic Topology Optimization (DTO) is obtained without considering of uncertainties related to the uncertainty parameters. However, the RBTO can consider the uncertainty variables because it has the probabilistic constraints, In order to determine whether the probabilistic constraint is satisfied or not, simulation techniques and approximation methods are developed, In this paper, the reliability index approach (RIA) is adopted to evaluate the probabilistic constraint, In order to apply the ESO method to the RBTO, a sensitivity number is defined as the change in the reliability index due to the removal of ith element. Numerical examples are presented to compare the DTO with the RBTO.

Synthesis and Morphology control of Aluminum Nitride by Direct Nitridation Process

金容奭 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.5 No.-

A1N 분말과 휘스커는 순수한 질소분위기에서 알루미늄 분말의 직접 질화법에 의해서 합성되었다. 알루미늄의 질화 반응은 시편이 점화가 일어나는 온도까지 가열하는 반응으로 정화열에 의한 발열반응은 약 3분이내에 끝난다. A1N 휘스커 같은 형상은 시편을 900℃로 가열했을때 관찰된다. 이 논문에서는 A1N 휘스커를 형성시키기 위한 실험 조건을 제시하였다.

가토의 하악골 연장시 Sodium fluoride 투여가 골형성에 미치는 영향

김용하,설정현,변우목,김정철,우상현,강무석 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.4

The purpose of this study was to improve bone formation and shorten the period involved in distraction osteogenesis using sodium fluoride (NaF). This has been used in managing osteoporosis for several decades. This study was carried out on 40 New Zealand white rabbits. Twenty animals were used for a control group (no medication) and 20 for the experimental group. NaF 1 mg/kg/day was administered to each experimental animal via drinking water beginning 4 weeks prior to surgery and continued until sacrifice for examination. A distraction device was applied to the left mandible along a plane perpendicular to the direction of osteotomy. After a 5-day latent period, the mandibles were lengthened at 1 mm per 24 hours for 10 days. Five rabbits from each group were sacrificed on the 1st day, 2nd week, 4th week and 8th week of the consolidation period. After lengthening, all the rabbits developed a severe cross-bite. By the 4th week, cortical continuity was seen. Bone densities at the site of bony lengthening were measured by quantitative computer tomography (QCT) and dual X-ray absorptiometry (DXA). The results were as follows: the measurements of the experimental group were significantly higher than of the control group by the 1st day of the consolidation period (p<0.05) and insignificantly higher after the 2nd week. Histologically, in the experimental group, there were more osteoblasts, increased and thickened trabeculae and more mature lamellar bones than in the control group. This study showed that osteogenesis of the experimental group was significantly higher during and immediately after distraction. Our study suggested that the use of NaF could improve bone formation and decrease the period of distraction osteogenesis if a safe dose and method of fluoride administration can be determined for growing humans.

정보통신산업의 국민경제적 위상과 전망

김용규,문석웅,홍동표 한양대학교 디지털경제연구소 2003 디지털경제연구 Vol.8 No.-

가토의 하악골 연장에서 잠복기간 단축의 영향

김용하,설정현,최준혁,강무석 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.5

To evaluate the effect of shortening the latent period for distraction osteogenesis, the authors experimented with distraction osteogenesis for a 24-hour latent period in the mandibles of rabbits. This study was carried out on 32 New Zealand white rabbits, each weighting 2000 to 2500 gm. Twenty animals were used for the control group and 12 for the experimental group. A unilateral external fixation device was applied to the left mandible. The mandibles were lengthened at 1 mm per 24 hours for 10 days. Five rabbits from the control group and three from the experimental group by random selection were sacrificed on the first day, and at the second, fourth and eighth week of the consolidation period. After lengthening bone densities at the site of the left mandibular bony lengthening were measured by quantitative computer tomography (QCT) and dual energy x-ray absorptiometry (DXA). As a result, the DXA value showed no difference compared to the control group after two week's consolidation. The trabeculae were thicker and had begun to be surrounded by lamellar bone both in the control and experimental groups histologically. In conclusion, the results of this study indicate that the osteogenetic effect in the experimental group was nearly the same as in the control group. If stable fixation and minimal periosteal dissection were performed during the procedure, the latent period would not be an important factor in distraction osteogenesis of membranous bone.

전자상거래의 확산과 지원탐색에 관한 연구

김용만,김석용 慶南大學校 産業經營硏究所 1999 産業經營 Vol.24 No.-