제 1형 신경섬유종증 환자에서 발생한 위장관 간질종양 1예

원경준,이준,변유미,조민근,한경택,김원,홍란,임성철,김경종,김영대,박찬국,김만우 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2

Gastrointestinal stromal tumor (GIST) is the most common non-epithelial neoplasm arising in the gastrointestinal tract, but this tumor is rarely seen in association with type l neurofibromatosis (NFl) Generally, the majority of GISTs are isolated neoplasm and they are sporadically found in the stomach, but the GISTs in NFl patients are usually multiple and usually found in the small intestine. We report a case of multiple GISTs in the jejunum of a 63-year-old woman diagnosed as NFl accompanied by complication of gastrointestinal bleeding, In this case, Patient had multiple cafe-au lait spots and neurofibroma on skin and had freckling on axilla and groin, and then, we made a diagnosis of NFl. Gastrointestinal bleeding is controlled by resection of multiple GISTs. Generally, only 3-5% of all gastrointestinal bleeding comes from the small bowel. Causes of small intestinal bleeding are angiodysplasia, neoplasm, NSAIDs induced ulcer etc. but, If patients have NFl accompanied by complication of gastrointestinal bleeding, GISTs on small bowel must be considered.

情緖障害兒의 理解와 治療的指導 問題

金慶澤 대구교육대학교 1976 論文集 Vol.12 No.-

In this study the emotional disturbance, from the formative viewpoint, is not the secondary one which is formed by the intelletual or physical handicap , but chiefly the one caused by the following factors which appear through life process or human relation: the loss of self-confidence, inferiority complex, conflict, defeat feeling, guilt-feeling, hatred, frustration, over-sensitivenss,jcalousy, fear and anxiety. That is, this study deals with the emotional problems by internality formed primarily as psychological cause. W, Healy, an American psychiatrist, compared the children who had ever expenced delinquency with those who had not, in the course of emotional development during infant age and chilhood. According to the result of this comparison, ninety % of the former had had a serious traumatic experience, but only thirteen % of the latter had experienced that, in the course of emotional development during infant age and childhood. This says that the emotional disturbance has a great influence on the cause of delinquency. The emotional disturbance of the children are basically caused by the following things:strain, fear, anxiety, frustration, psychological impulse from life environment during infant age or childhood, conflict and agony of life situation, and dissonance of companion ship, and so on. Furthermore, this is deelply accumulated, and so this proceeds to the problem of character and behavior in the end. And at last this proceeds to the unsocial or antisocial behavior as a problem behavior. So this study deals with the following problem contents in order to promote a sound personality by the early elinination, decrease, and discovery of the emotional disturbance. 1)Several understanding problems of the emotional disturbance 2) Genetical Factors of the emotional disturbance 3) Problems on the classification of the emotional disturbance 4) Survey problem on the childeren with emotional disturbance 5) Diagnostic problems of the emotional disturbance 6) The problem of guidance with the treatment of the emotionally disturbed Children.

ATM망에서 비실시간 서비스를 위한 효율적 셀 제어 기법

김변곤,김남희,정동수,정경택,이종인 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

The Guaranteed Frame Rate(GFR) service has been designed to accomodate non-real-time applications, such as TCP/IP based traffic in ATM networks. The GFR service not only guarantees a minimum throughput at the frame level, but also supports a fair share of available resources. In this paper, we propose a cell control algorithm which can improve the fairness and the throughput through the traffic control in GFR service. For the evaluation of a proposed scheme, we compare the proposed scheme with the existing scheme in the fairness and the throughput. Simulation results that the proposed scheme can improve the fairness and throughput than the existing scheme.

어린이의 問題行動 治療를 위한 遊戱療法의 適用上 問題考察

金慶澤 대구교육대학교 1973 論文集 Vol.9 No.-

Children learn a number of things through plays because children express their natural feelings and thinkings by means of behaviors rather than their linguistic expressions. Some needs, attitude and feelings are shown by their plays. Then acceptive and receptive atmosphere are established. So the more they play the more rakedly they reveal their feelings. Through precise observation of their behaviors, we can understand the traits of their personality and gain several informations for diegnosing behaviors. Besides, if the children get some frustration on account of their limited circumstances, they are fallen into emotional stress. And according to the accumulation of this stress the maladjustment on the personal and behaviorial activities is often shown. In order to remove these maladjustments and maintain normal mental health by plays, this study will be concentrated on the catharsis of melancholy feelings and on the expression of their depressed feelings. In this article, the follwoings are investigated for applying for school education in an attempt to solve these problems. 1) The subject children on play therapy. 2) The theoretical point on play therapy. 3) The technical problem on play therapy. 4) The facilities and establishments on play theory.

學習 不適應兒의 診斷과 心理學的 考察

金慶澤 대구교육대학교 1968 論文集 Vol.4 No.-

Instruction of teachers aim at expediting and improving the learning of the maladjusted children to attain a high level of intelligence, sociability, physical conditions, character and emotion. Directing them is the duty of the teachers and has been a subcurrent problem in the guidance of their study and living. In light of the cause analysis, devided largely into two parts, for the maladjusted children, a study was made both on the subjective conditions (or character consititution) such as intellect, physique, character, emotion, basic scholarship and psychological habit of lesson and on the effect of the dynamic human relation and psychological factors in the objective conditions (or environment constitution) such as family, class and school, society on the growth of the children. According1y, attention should be invited to diagnose the causes and find ways of instruction. So the important matters and instruction methods for the maladjusted children in lesson were concretely studied.

Counseling의 基本的 槪念 및 三學派에 관한 理論과 技術問題 比較考察

金慶澤 대구교육대학교 1971 論文集 Vol.7 No.-

Counseling is a central and momentous part of guidance. For, its purpose is to accelerate the client's growth of personality by professional and technical activities to help the adjustment of the client. In this thesis, I defined some major concepts of counseling-adjustment, needs, human relations, conflicts, self-expression, and self-concept-from my point of view. At the same time, I made clear some differences among the three theories of counseling-clinical, client-centred, and eclectic counseling. I discussed and compared the emphases and problems the three schools hold respectively. As a conclusion, I suggested what kind of theories and techniques would be the most desirable in our school setting.

치과 재료용 NiTi 합금의 특성에 대한 Ag 첨가의 영향

오근택,박기호,심형민,황충주,김경남 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.4

Equiatomic and near-equiatomic nickel-titanium alloys have shape memory effect and superelasticity. However nickel-titanium alloys are extremely sensitive to the precise nickel-titanium ratio and alloying additions. There are many reports on the alloying additions such as Fe, Al, Cr, Co, V, Pt, Pd, Zr, Hf, Nb and Cu. The purpose of this study was to investigate the effect of silver addition to nickel-titanium alloy for dental and medical application.Arc melting process was used to fabricate nickel-titanium alloys. The casts were heat-treated in a vacuum furnace at 950℃ for 72 hours to homogenize their composition. Subsequently, they were hot-rolled at 950℃ to obtain the plate samples and annealed in a vacuum furnace at 950℃. To investigate the properties of nickel-titanium alloys, phases, transformation temperature, compositions, corrosion resistance and hardness were evaluated using X-ray diffractometer, differential scanning calorimeter, energy dispersive spectroscopy or atomic absorption spectroscopy, potentiostat and micro-vickers hardness tester, respectively. NiTiAg alloys showed the low silver recovery rate for the cast due to its low evaporation temperature, and showed low silver solubility to NiTi alloy. Silver addition to NiTi alloy increased transition temperature range (TTR) above 100℃ and stabilized martensitic phase(monoclinic structure) at room temperature because Ms temperature was above room temperature. Martensitic and austenitic phase existed in x-ray diffraction pattern of solution annealed NiTiAg alloys. The Silver addition is considered to improve corrosion resistance and change largely the mechanical properties depending upon the amount of alloying addition and types of addition elements.

골내 고정 장치용 초내식성 오스테나이트 및 듀플렉스 스테인리스강 가공재의 특성

오근택,강국진,박용수,김경남 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.3

Nickel is one of the most common causes of allergic contact dermatitis and hypersensitivity. In case of stainless steel as biomaterials, the higher the corrosion resistance and the lower the nickel content, the better it is or the human body. However, because nickel plays an essential role in the stabilization of the austenitic phase and the corrosion resistance of stainless steel, it is difficult to remove the nickel from the constituents of stainless steels completely. Therefore, the purpose of this study was to investigate corrosion resistance, cytotoxicity, and mechanical property of super stainless steels, which had high corrosion resistance by synergistic effect of Mo(or W) and N, with respect to nickel content and to evaluate their potential for orthodontic applications. Super austenitic stainless steel(SR-50A) had high nickel content of 22% and super duplex stainless steels nickel contents of 6~10%. Super austenitic and duplex stainless steels had nitrogen contents of above 0.2%. Also, these steels had high Mo or W contents which were able to increase the localized corrosion resistance. In terms of hardness, super stainless steels, which had Vickers hardness values of 374~400 Hv in cold-rolled state and 186~285 Hv in annealed state, exhibited higher values than 316L S. S.. Duplex stainless steels exhibited higher mechanical properties than austenitic stainless steels. In terms of corrosion resistance, super stainless steels exhibited lower passive current density(2.3~3.8 ㎂/cm^2) than pure Ti(6.6㎂/cm^2) in the body-simulated solution and similar potentiodynamic polarization behaviors. Pitting corrosion occurred in 316L S. S. but not in the others. Thus these steels were considered to have high corrosion resistance in the human body. In terms of cytotoxicity, SR-5OA and SAF2507 exhibited none cytotoxicity and the others slight. This results indicated that the cytotoxicity of alloys containing nickel had no relation with nickel content because SR-5OA with the highest nickel content exhibited none cytetoxicity In conclusion, it is considered that super stainless steels with high corrosion resistance and good biocompatibility can be used for orthodontic applications because of the enhanced passive film by high addition of Mo, W, N, etc.

교정학적 적용을 위한 초내식성 스테인리스강의 특성

오근택,김금진,황충주,박용수,김경남 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.3

Various kinds of orthodontic appliances have been developed for ideal tooth movement during orthodontic treatment. The orthodontic appliances made of metals are bands, arch wires, brackets and miniscrews as orthodontic anchorage. Generally, these appliances are made of stainless steel, pure titanium, Ni-Ti and TMA with the proper biocompatibility. However, localized corrosion of these materials can frequently occur in the particular environment. Super stainless steels, recently developed, have good corrosion resistance to reduce metal ion release induced by many kinds of corrosion. Recently, it has been reported that nickel ion release from orthodontic appliances affect the prevalence of nickel sensitization; however, there has been some controversy about nickel hypersensitivity to orthodontic appliances containing nickel. The purpose of this study was to evaluate and compare the microhardness, nickel ion release, corrosion resistance and cytotoxicity of 4 types of super stainless steels and 316L stainless steel as the control group according to nickel contents, and to determine the acceptability as the new material for various kinds of orthodontic appliances. All super stainless steels showed higher microhardness than 316L stainless steel, SR-3Mo showed especially the highest microhardness. In anodic polarization test, corrosion resistance was high in order of SR-50A, SFSS, SR-6DX, 316L stainless steel, SR-3Mo. There was no increase in nickel ion release from SR-50A, SR-6DX, 316L stainless steel with immersion time in artificial saliva; whereas there was some increase from SFSS and SR-3Mo with immersion time. All super stainless steels showed very low cytotoxicity regardless of nickel contents although SR-3Mo showed relatively higher cytotoxicity than the others. It is concluded that SR-50A among super stainless steels has the highest corrosion resistance and biocompatibility. It is undesirable to consider the alloys with high nickel content to release lots of nickel ion.

교정용 스테인리스강 선재의 내식성에 미치는 응력 제거 열처리 조건의 영향

오근택,전용석,황충주,김경남 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.2

Heat treatment is applied to orthodontic wires in order to relieve the stress that results from cold working and the orthodontists manipulations. In this study, 4 types of wires were heat-treated in an air, argon or vacuum environment, and were either cooled in a furnace or a water bath. Corrosion properties of the heat-treated wires were investigated by potentiodynamic method. The difference of corrosion resistance between the wires heat-treated in an ambient according to cooling methods was not significant. After heat-treated in an ambient, both water-cooled and furnace-cooled wires had a similar and low corrosion resistance. The difference of corrosion resistance between the wires heat-treated n a vacuum environment with cooling methods was significant. After heat-treated in a vacuum, the furnace-cooled wires had high corrosion resistance, but the water-cooled wires low. After heat-treated in a vacuum, argon, or air environments, the water-cooled wires had low corrosion resistance. It was considered because the irregular and unstable film was formed on the surface of the wires when cooled in a water bath. The control wires showed a low current density and high pitting potential, but most of the heat-treated wires did high current density and low pitting potential except for the wire heat-treated in vacuum and then cooled in a furnace. Conclusively, orthodontic wires are considered to have to be heat treated in vacuum condition or inert gas environment and then to be cooled in a furnace in order to inhibit surface oxidation, minimize the decrease of corrosion resistance and improve the mechanical properties.