내시경적 밴드 결찰술로 치료한 출혈을 동반한 위 혈관이형성증 1예

김갑식,허종현,성용완,조영화,구동영,유재훈,노지훈,문원 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2

Gastric angiodysplasia is vascular ectasia in mucosa and submucosa of the gastric wall. It is an uncommon cause of upper gastrointesinal hemorrhage that may occur in the stomach or duodenum. There are many kinds of endoscopic treatments, such as argon plasma coagulation, electrocoagulation, heat probe, and submucosal injection of hypertonic saline mixed with epinephrine for gastric angiodysplasia. However, these treatment methods are associated with high rate of rebleeding. In order to avoid the recurrence, endoscopic band ligation has recently been used as an alternative method for endoscopic treatment of gastric angiodysplasia. We encountered a case of gastric angiodysplasia that presented with overt bleeding and anemia, and was successfully treated with endoscopic band ligation.

吸着劑를 利用한 金屬 이온 및 有害物質의 吸着除去에 관한 硏究 : Comparison of removal effects of activated carbon, chitosan and delignified saw dust on metal ions and some hazardous materials 활성탄, Chitosan 및 탈 Lignin 톱밥의 금속이온 및 유해물질 흡착제거 성능의 비교

김용범,김현갑,김용우,손호영 서울産業大學校 1994 논문집 Vol.39 No.1

전통적인 흡착물질로 가장 많이 애용되어 온 활성탄(AC)과 새로히 개발된 천연고분자 물질 chitosan(CS) 및 脫 lignin톱밥(SD)으로 각각의 여과용 column을 만들고 음용수에 인위적으로 혼입해 둔 pb²+, Cd²+, Cu²+, Mn²+ 및 CN-에 대한 흡착 제거 성능을 비교 연구 하였다. 음용수에 혼입한 각 물질의 원 농도는 Pb²+; 3ppm, Cu²+; 3.1ppm, Mn²+; 0.7ppm, CN;5.3ppm였으며 이들 물질로 각각 단일용액을 조제하여 실험할때는 유속을 1.33㎤/min으로, 혼합용액으로 실험할때는 0.74㎤/min으로 하고, 충전된 흡착제의 건조 중량은 각가 10g으로 하여 흡착제거 실험을 하였다. 위의 각각의 단일 물질 용액에 대한 흡착제의 단위 중량(g)당 파괴점까지의 제거 용량은 Pb²+의 경우, 활성탄이 3.3ℓ, 탈 lignin톱밥이 3.5ℓ로 나타났고, Mn²+의 경우 활성탄이 10ℓ, 탈 lignin톱밥이 12ℓ, chitosan은 12.5ℓ로 나타났으며, CN-의 경우에는 활성탄이 4.8ℓ, 탈 lignin톱밥이 5.5ℓ, chitosan은 4.7ℓ로 각각 나타났다. 이들 혼합용액에 대해서는 단위 중량(g)당 파괴점까지의 흡착제거 용량은 pb²+의 경우, 활성탄이 2.5ℓ, 탈 lignin톱밥이 2.8ℓ, chitosan은 2.7ℓ로 나타났고, Cd²+의 경우, 활성탄이 2.4ℓ탈 lignin톱밥이 2.7ℓ,chitosan은 2.4ℓ로 나타났으며, Cu²+경우에는 활성탄이 2.8ℓ탈 lignin톱밥이 3.2ℓ, chitosan은 2.7ℓ로 나타났다. 대체로 Pb²+, Cd²+, Mn²+ 등 금속이온에 대한 흡착제거에 있어서는 탈 lignin톱밥과 chitosan의 경우가 활성탄보다는 10~30%정도 높은 제거율을 보였으며, CN-에 대해서는 탈 lignin톱밥>활성탄>chitosan의 순으로 제거 효율을 나타내었다. Some adsorbents prepared from natural resorces were subjected to the experiments of removing some metal ions(pb²+, Cd²+, Cu²+ and Mn²+)and cyanide. The adsorbents applied in the experiments were activated carbon, delignified saw dust and chitosan powder, each of which was packed into a column in order to remove metal ions and cyanide artificially contaminated in the potable water, functioning as filters. The most effective adsorbent was found to be the delignified saw dust column in removing contaminants and activated carbon column was found the poorest among the three. Delignified saw dust demonstrated to be a most effective, cheaper and popular filtering saw dust demonstrated to be a most effective, cheaper and popular filtering material for the purification of potable water which most citizens are not yet confident with.

DTC를 이용한 새로운 파라메터 추출법

서용진,신희갑,이철인,장의구 중앙대학교 기술과학연구소 1994 기술과학연구소 논문집 Vol.24 No.-

In the manufacturing of VLSI circuits, variations of device characteristics due to the slight differences in process parameters drastically aggravate the performances of fabricated devices. Therefore, it is very important to establish optimal process conditions in order to minimize device sensitivities. In this paper, we used one-dimensional process simulator, SUPREM-Ⅱ, and two-dimensional device simulator, MINIMOS 4.0 in order to extract optimal process parameter which can minimize changes of the device characteristics caused by process parameter variation in the case of short channel nMOSFET and pMOSFET device. From this simulation, we have derived the dependence relationship between process parameters and device characteristics. Here, we have presented a method to extract process parameters from design trend curve(DTC)obtained by process and device simulations.

테니스 제 1서브에 관한 운동학적 분석

오용교,김갑선 서강정보대학 1997 論文集 Vol.16 No.-

The purpose of this study was to provide both coach and player with serving technique by analyzing the tennis player's 1st serving motion using three dimensional cinematography techniques. To accomplish the objective of this study three tennis players are used as subjects. The two video-cameras are used for the data collection. The serve motions are recorded with cameras operating at 30 frames per second. The direct linear transformation(DLT) method is employed to compute the three-dimensional coordinates of the digitized body points. Based on the results of this study, the following conclusions are drawn. 1. In backswing and toss phases, backswing has to be developed at initial position slowly and greatly. On the other hand, the racket in forward swing and impact phases has to be rotated quickly at impact with the ball to increase serve velocity. 2. The racket at impact has to be stroken for service target area. 3. To increase serving velocity, optimal toss height(about 3m) has to be maintained. And the body's joints be should more extension to the impact in maximum hitting height. 4. To serve effectively, the force has to be transferred from knee, to shoulder, to elbow, to wrist and finally to the racket.

晋州市 南江水質의 變化와 그 影響

金炯甲,趙鏞雲 진주산업대학교 농업기술연구소 1989 農業技術硏究所報 Vol.2 No.-

1988年 6月부터 12月까지 7個月 동안에 걸쳐 晋州市內의 南江 5개 지점을 매월 4∼5 일씩 採水하여 水質을 分析한 結果는 다음과 같다. 調査期間中 南江의 位置別 水質平均値는 1. 下水가 流入되지 않는 上位쪽은 各各 DO 8.8ppm, BOD 2.6ppm, SS 22.1ppm, 蒸發殘溜物 57.4ppm, KM_nO_4 消費量 8.6ppm, 硬度 67.1ppm, Cl^- 10.8ppm이었다. 2. 下水가 流入되어 흐르는 下位쪽은 各各 DO 6.3ppm, BOD 3.8ppm, SS 23.6ppm, 蒸發殘溜物 102ppm, KM_nO_4消費量 12.1ppm, 硬度 73.0ppm, Cl^- 14.2ppm으로서 比較的 汚染이 적었다. 3. 강의 中間에 位置하며 下水가 放流되는 지점은 一部地域이지만 심한 汚染度를 나타냈다. During the seven months from June to December in 1988, Water quality analyzed at five site of the Nam river in Chinju city. Analytical water sampled for four or five days of every month. For investigated preiods, the averages of water quality of the Nam river were as followed. 1. The upstream in which sewage didn't flow into were DO 8.8ppm, BOD 2.6ppm, SS 22.1ppm, total residue 57.4ppm, total hardness 67.1ppm, consumption of KMnO_4 8.6ppm and Cl^- 10.8ppm. 2. The downstream were DO 6.3ppm, BOD 3.8ppm, SS 23.6ppm, total residue 102ppm, total hardness 73.0ppm, consumption of KMnO_4 12.1ppm and Cl 14.2ppm. These showed the low pollution relatively. 3. Though the middle sewage inflow site was a small part, it seemed to be very polluted.

다국적기업의 해외 핵심센터에 관한 기존연구의 고찰과 연구과제

지용희,김득갑 서강대학교 경영연구소 2004 서강경영논총 Vol.15 No.2

이방성 및 직교이방성 재료에 대한 경계요소법(BEM) 해석과 균열에 대한 응력확대계수 해석

이갑래,최용식 成均館大學校 科學技術硏究所 1990 論文集 Vol.41 No.1

According to the developments of various composite materials, it seems to be very important to evaluate the strength and fracture behavior of composite materials. When the composite material is considered as anisotropic and orthotropic material, the characteristic equations of anisotropic and orthotropic have complex roots. If characteristic roots are equal, the fundamental solutions of BEM become singular. This paper analyse the fundamental solutions of the singular problem of orthotropic material using the method of mapping to isotropic material. And stress and displacement fields become singular when the characteristic roots are equal. In consideration of these singular problems, the fundamental solutions of BEM and stress intensity factors are analysed systematically for the anisotropic and orthotropic materials.

콘크리트의 급속염화물침투시험에 의한 염화물이온 확산계수 평가에 관한 실험적 연구

김갑수,조봉석,장종호,김재환,김용로,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

Chloride ions are considered to be the major cause of steel corrosion in concrete structures exposed to seashore environments and also permeation of chloride is controlled by chloride diffusion. Therefore, the study on chloride diffusion of concrete have been done so far by many researchers. In this study, several factors such as capacity of voltage, time of an electric current, concentration of NaCl solution, water-cement ratio, and temperature of the solution were examined to grasp what influence they were on the chloride ion diffusion properties using the Rapid Chloride Penetration Test(RCPT) by electrophoresis. Also standing on the basis of the such result application possibility of Rapid Chloride Penetration Test(RCPT) used in this study will be evaluated and the basic data on the durability design for the chloride attack will be suggested.

부신 제거 백서에 티타늄 임플랜트 매식후 주위 골형성에 관한 연구

최갑림,김종렬,박봉수,성일용 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.3

The use of dental implants has increased tremendously in recent years and is expected to increase even more in the future. The successful outcome of any implant procedure is surely dependent on interrelationship of the various components of an equation that includes biocompatibility of implant material, macroscopic and microscopic nature of the implant surface, the status of implant bed, surgical technique, undisturbed healing phase and subsequent prosthetic design and long-term loading phase. The purpose of this study was to clarify the effects of adrenalectomy on the osseointegration of pure titanium implants. Seventy rats, 11 weeks of age, were divided into two groups : an adrenalectomized group and a control group. Titanium screw implant(diameter, 2.0mm ; length, 3.5mm) was placed into left tibia of 70 rats, 35 in control group and 35 in the experimental group. The rats were sacrificed at different time interval (1, 2, 3, 4, 6, 8, and 12 weeks after implantation) for histopathologic observation, histomorphometric analysis and immunohistochemistry with fibronectin and CD44 antibody. The results obtained from this study were as follows : 1.Histopathogically, findings, newly formed bone was seen at 3 weeks control group and became lamellar bone at 12 weeks. At 6 weeks, lipocytes were observed in bone marrow space. Thickness of regenerated trabecular bone increased till 6 weeks after then, that decreased gradually. 2.By histomorphometric analysis, marrow bone density and contact ratio of marrow bone to implant decreased significantly from 8 to 12 weeks in experimental group compared to control group and also total bone to implant contact ratio decreased significantly from 4 to 12 weeks in experimental group compared to control group. 3.Fibronectin immunoreactivity was very strong at 3 and 4 weeks control group. And after that reduced gradually. But it was continuously strong from 1 to 12 weeks experimental group. 4.CD44 immunoreactivity was very strong in the newly formed osteoblasts at 3 and 4 weeks control group. But it reacted minimally later. However, it reacted continuously strong from 3 to 12 weeks experimental group. From these results, bone to implant contact ratio decreased gradually from 4 weeks in adrenalectomized group compared to control group. CD44 and fibronectin immunoreactivities were strong at all times in adrenalectomized rats. Therefore, it could be stated that immature bone remained continuously for a long time and not readily proceeded into mature status.

有限幅 異材結合板材에서의 Mode Ⅰ 龜裂 應力擴大係數 解析(Ⅰ)

崔鎔湜,梁源鎬,李甲來 成均館大學校 科學技術硏究所 1987 論文集 Vol.38 No.2

This paper presents the theoretical analysis of the crack tip stress intensity factor for a center crack in a finite width bimaterial plate. The analysis is based on the integral equation and the complex stress function, where the unknown real stress function are determined from the boundary conditions. The Gauss-Laguerre numerical integral method is employed in numerical calculations. The stress intensity correction factor F(α) is given in the integral form; F(α)=1 + ∫_0^α K(t_1, u)du where α = α/W_1 : Dimensionless crack length K_(t,u : Kernel The correction factor value varies with the width ratio ω_0, The correction factor F(α) is influenced by the width ratio ω_0 within 12% at the infront of the bimaterial interface (α=0.9) in spite of the same λ value. For the case of λ(=E_2/E_1) = 1 or λ = 0 (homogeneous material) the correction factor values agree well with Feddersen's result in the range of α<0.7. In all cases, as α approaches to 1 (bimaterial interface), the correction factor value increases rapidly for λ<1, and decreases rapidly for λ>1.