TiNi/Al6061 형상기억복합재료의 고온에서의 손상거동에 대한 AE 특성

이진경,박영철,구후택 한국비파괴검사학회 2002 한국비파괴검사학회지 Vol.22 No.1

금속복합재료(MMC) 내부에서의 강화재와 기지재사이의 열팽창계수의 차이에 의해 발생하는 인장잔류응력은 복합재료의 인장강도를 저하시키는 심각한 문제중의 하나이다. 따라서 본 연구에서는 TjNi/Al6061 형상기억복합재료내부의 인장잔류응력의 문제를 해결하기 위하여 강화재로써 TiNi 합금을 사용하였다. TiNi 합금은 형상기억효과를 이용하여 복합재료내부에 압축잔류응력을 발생시킴으로써 인장강도를 증가시키는 역할을 한다. 복합재료내부에 압축잔류응력을 발생시키기 위하여 예변형(pre-strain)을 가하였다. 본 연구에서는 예변형의 변화에 따른 압축잔류응력의 영향을 평가하였으며 AE 기법을 이용하여 고온에서의 복합재료의 미시적 손상거동과 예변형의 영향을 평가하였다. It has been known that tensile residual stresses occurring by the thermal expansion coefficient mismatch between fiber and matrix is a cause of the weak strength of metal matrix composites(MMCs). In order to solve this problem, TiNi alloy fiber was used as a reinforced material in TiNi/Al6061 shape memory alloy composite in this study. TiNi alloy fiber improves the tensile strength of the composite by causing compressive residual stress in matrix on the basis of its shape memory effect. Pre-strain was imposed to generate the compressive residual stresses inside the TiNi/Al6061 shape memory alloy composites. AE technique was used to quantify the microscopic damage behavior of the composite at high temperature. The effect of applied pre-strains on the AE behavior was also evaluated.

만성정신병환자의 재활치료를 위한 주간보호 모델

이규항,김한오,이후경,윤성철,성상경,함웅,윤배중 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.5

목 적 : 본 연구는 전문병원 위탁형 정신보건센터에서 실시한 주간보호의 전체적인 체계, 운영, 프로그램에 관한 모델을 소개하고, 이 모델을 주간보호에서 시행한 후 그 결과와 시행과정에서 나타난 특징을 분석하여, 우리 실정에 맞는 주간보호 모델을 발전시켜 만성정신병환자의 생활유지와 재활을 촉진시키기 위한 목적으로 실시되었다. 방 법 : 본 주간보호 모델(이하 본 모델이라 함)을 1997년 3월부터 1998년 2월까지 의왕시 정신보건센터에서 총 23명의 환자를 대상으로 실시하였다. PANSS, Quality of Life, 삶의 만족 척도를 주간보호 전과 주간보호 실시 3개월 이후에 조사하였다. 프로그램 유익성 척도, 13가지 치료요인 척도를 주간보호 1개월째와 주간보호 실시 3개월 이후에 조사하였다. 결 과 : 1) 본 모델은 만성정신병환자의 증상을 감소시키고 삶의 질을 향상시켜, 환자의 생활유지 및 재활에 도움을 주었다. 2) 본 모델은 다양한 형태의 집단치료들을 사용하여 만성정신병환자에게 유익을 주었으며, 특히 예술치료와 활동치료가 환자의 신체적, 심리적, 사회적 기능회복을 위해 중요한 역할을 하였다. 3) 본 모델에 작용하는 치료요인의 특징을 보면 주간보호 초기와 후기에 모두 중시된 치료요인은 치료자와의 동일시, 치료자의 조언, 일차가족집단의 교정적 감정경험이었다. 주간보호 초기에 중시된 치료요인은 집단응집력, 이타심이었으며, 주간보호 후기에는 희망의 고취가 중시되었다. 4) 본 모델은 여러 분야의 치료자들과 다양한 치료방법들을 전체적으로 통합하여 사용하는데 유용하였다. 결 론 : 본 모델은 만성정신병환자의 생활유지와 재활을 위해 우리 나라에서 효과적이면서 효율적으로 적용될 수 있을 것으로 생각된다. Objectives : The purpose of this study was to present general system, operation, and program of a day care model managed by a psychiatrist, to evaluate the results of performing this model, and thus to develop a day care model applied to Korean situation appropriately for promoting maintenance and rehabilitation of chronic psychotic patients. Methods : We performed this day care model(hereinafter called as this model) from March 1997 to February 1998. The subjects were composed of 23 psychotic patients. PANSS, Quality of Life Scale, Life Satisfaction Self-Rating Scale were used before beginning this model and after three months of performing this model. Program Helpfulness Scale, 13 Therapeutic Factors Scale were used at one months of day care and after three months of day care. Results : 1) This model helped maintenance and rehabilitation of chronic psychotic patients through reducing their symptoms and increasing quality of life. 2) This model used the various group therapy, especially creative art therapy and activity therapy, played an important role for recovering physical, psychological, and social functions. 3) Important therapeutic factors at early and late period of this model were identification with therapists, guidance of therapists, and the corrective recapitulation of the primary family group. Important therapeutic factors at early period were group cohesiveness and altruism, and at late period instillation of hope. 4) This model was useful for integrating the multidisciplinary therapeutic team and the various therapeutic methods. Conclusion : This model would be applied to day care in this country effectively and efficiently for maintenance and rehabilitation of chronic psychotic patients.

유연생산 시스템 구축을 위한 공작물 자동교환 유닛 설계

박후명,이용중,이상진,하만경 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

The objective of this study is to develop an automatic object changer unit to improve processing problems existed in the conventional horizontal machining center. In order to perform this objective, a upward and downward traverse unit in which a unit that consists of a motor and reducer, chain and sprocket wheel, and upper and lower base employed in an automatic object changer unit performs sliding contact motion in a frame was designed. To achieve this design, constraint conditions for the upward and downward traverse unit first designed. Then, an operation mechanism was designed and that was introduced as a sum of kinetic energy for the sprocket wheel and upper and lower base based on the moment of inertia, which is the kinetic energy of the converted upward and downward traverse unit in the side of the reducer. In addition, The work required to rotate the converted upward and downward traverse unit in the side of the reducer by one revolution can be calculated using the sum of work that is required in the sprocket wheel and upper and lower base that is a part of the upward and downward traverse unit. Furthermore, the converted equation of motion in the side of the motor can be introduced using the equation of motion using the converted upward and downward traverse unit in the side of the motor. Then, Then, a proper motor can be determined using predetermined specifications employed in the motor and several parameters in the upward and downward traverse unit in order to verify such predetermined specifications. Also, a design of a horizontal traverse unit that performs sliding motion on a upward and downward traverse unit and simulation that verifies the results of this design are required as a future study.

만남집단과 환자집단의 집단정신치료 비교

방양원,이규황,이후경,함웅,윤성철 大韓神經精神醫學會 1995 신경정신의학 Vol.34 No.4

Objects : This study was conducted to understand the essential group phenomena of Encounter group and Patient group through the global comparison of short-term group psychotherapy between two groups. Methods : The Encounter group consisted of 17 normal persons and Patient group consisted of 19 patients with schizophrenia. all the members of the two groups were unmarried females. The mean rank of therapeutic factors of two groups was compared by short-form of Yalom's Q-sort. The differences between each therapeutic factor of two groups was compared by Mann-Whitney test. Also the global differences between two groups were compared by analyzing both the individuals within the groups and the groups as a whole. Results : The results of the comparison of the therapeutic factors of the two groups are as follows : 1) Existential factor was set a high value by all the two groups. 2) Encounter group set a high value an interpersonal learning(Input), but Patient group set a high value on instillation of hope and group cohesiveness. 3) Identification was set a high value by Encounter group, but was set a low value by Patient group. The results of the global analysis of two groups are as follows : 1) It was more difficult for Encounter group to maintain the motivation of attendance and to recognize their own problems than Patient group. 2) All the leaders and the members of Encounter group showed more positive attitude than those of Patient group. On the contrary all the leaders and the members of Patient group showed more negative attitude than those of encounter group. 3) Patient group expressed more intense feelings and expressed the feelings more frankly and more simply than Encounter group. 4) Encounter group dealt with the matters pertaining to "self realization", that is, fundamental question of human beings more than Patient group. Patient group dealt with the matters pertaining to social adaptation, that is , "ego strengthening" more than Encounter group. 5) In Encounter group, the feeling of in feriority was the major cause of the dropout. But in patient group, the discharge from hospital was the major cause of th dropout. Conclusion : We have found out the various differences between encounter group and patient group by the comparison of therapeutic factors and analytic understanding of the two groups. These results are the basic data for understanding of Encounter group and Patient group. And these results can be applied to the development of the skills of group psychotherapy for the treatment of the patients.

실험계획법을 이용한 연삭가공물의 표면거칠기 분석

지용주,이상진,박후명,곽재섭,하만경 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

A measure for good products manufactured by grinding process is the surface roughness that is affected by a lot of operating parameters such as types of abrasive, grain size, bond material, wheel speed, table speed, depth of cut, hardness of workpiece and stiffness of grinding machine. In this study, an application of the design of experiments was tried for evaluating the effect of operating parameters on the surface roughness. The workpiece was a high speed tool steel(SKH5I) and the surface grinding was conducted. In order to obtain the best surface roughness within constraints of the working range, the optimal grinding conditions were selected. The usefulness of this method was evaluated by the statistical strategy.

독거노인과 가족동거노인의 신체적 건강상태와 건강행위에 관한 연구

장은희,김후자,권경남,정귀애,김연화,이인혜 영남이공대학 2004 論文集 Vol.33 No.-

Purpose : The purpose of this study was to identify the physical health status and health behavior practice of in-home elderly in order to provide basic data for effective nursing intervention to promote health and quality of life. Method : The subjects for this study were 299 elderly persons in the D city. Data were collected by interview with questionnaires. Result : The ratio of chronic disease was higher for the elderly who live alone than the elderly who live with family. Arthritis was the most common chronic disease of the elderly in spite of the fact that either they live alone or live with family. The physical health status score of the elderly who live with family was statistically higher than the elderly who live alone. The health behavior score of the elderly who live with family was statistically higher than the elderly who live alone. Conclusion : To promote health behavior of the elderly, it is necessary to develop nursing intervention that considers sociocultural tradition and demographic character.

전수면박탈이 정상인의 생리기능과 인지기능에 미치는 영향

정종현,송후림,신윤경,한진희,이성필,홍승철 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.6

Objectives : Purpose of this study was to investigate physiological and neurocognitive effects of total sleep deprivation by using laboratory blood tests and the computerized neurocognitive function test in healthy subjects. Methods : Sixteen healthy volunteers participated in this study. Subjects were recommended to remain awake for 48 hour sunder continuous surveillance. Lab tests of cortisol, Prolactin, thyroid hormone, growth hormone, and immunoglobulin (IgG, IgA, IgM, IgD, IgE), CBC, BC and the Vienna test were performed before and after 48 hours of total sleep deprivation. Results : Concentration of T3 and T4 significantly increased after deprivation. In the reaction test, distribution reaction time significantly increased, and correct reaction significantly decreased. In the vigilance test, amount of correct reaction Signifi-cantly decreased, and the mean value of correct reaction time was significantly delayed. Level of fasting blood sugar, total protein, albumin, alkaline phosphatase and potassium significantly increased, respectively, except for the level of total bilirubin which was decreased. After total sleep deprivation, WBC counts significantly increased. Regarding immunoglobulin level, IgG,IgA and Ag M concentrations appeared to decrease, but the results were not statistically significant. Conclusion : The effect of total sleep deprivation on physiological function was significant in the level of thyroid hormone. Although statistically not significant, the results of growth hormone and the immune system showed a trend in relations to the effect oftotal sleep deprivation. Results of blood chemistry suggest that sleep dephvation may influence metabolism Of hepato-biliary system. Cognitive impairment was also seen in reactive and vigilant functions after total sleep deprivation.

정신병환자의 통합치료를 위한 낮병원 모델

함웅,김선재,윤성철,성상경,이규항,이후경 大韓神經精神醫學會 1997 신경정신의학 Vol.36 No.6

본 연구는 통합치료를 위한 낮병원 모델을 소개하고, 이 모델의 낮병원 치료를 시행하여 그 결과를 평가하고 시행과정 중에 나타난 특징을 분석하며, 우리 실정에 맞는 낮병원 모델을 발전시켜. 정신병환자를 효과적으로 돕고 사회 재적응을 촉진시키기 위한 목적으로 실시되었다. 본 모델의 낮병원 치료를 1996년 5월부터 12월까지 총 25명의 환자를 대상으로 실시하였다. BPRS. 삶의 만족 척도, 프로그램 유익성 척도, 13가지 치료요인 척도, 가장 중요한 사건 설문지를 낮병원 치료초기와 말기에 시행하여 그 결과를 중심으로 낮병원 모델에 대한 평가를 하였다. 본 연구결과는 다음과 같다. 1) 본 낮병원 모델은 나이, 입원횟수, 유병기간. 기능수준에 있어 다양한 환자들에게 광범위한 치료를 제공할 수 있었다. 2)본 낮병원 모델은 치료효과라는 측면에서 볼 때 주로 음상증상을 호전시키고 주관적인 삶의 만족도를 높여주는데 기여하였다. 3) 상위기능집단과 하위기능집단으로 나누었을 때 상위기능집단에서는 집단정신치료, 싸이코드라마등 비구조적이고 자신의 내면을 깊이 있게 탐구를 할 수 있는 치료를 높이 평가하였으나 하위기능집단에서는 그렇지 않았다. 그러므로 두 집단으로 나누어 낮병원 치료를 진행하는 것이 더 효과적일 수 있다. 4) 치료요인의 결과를 살펴보면 상위기능집단과 하위기능집단 모두 치료가 진행됨에 따라 작용하는 치료요인에 차이가 있었으며. 상위기능집단은 말기에 대인관계학습을 더 중요시하였고. 하위기능집단은 말기에 사회화 기술의 발달을 더 중요시하였다 그러므로 상위기능집단은 낮병원 종결 후 장기외래환자 집단정신치료에. 하위기능집단은 사회복귀시설에 참여하는 것이 타당할 것으로 생각된다. 5) 본 낮병원 모델은 전체적으로 운영하기가 편하였고, 치료인력을 최대한 효율적으로 사용 할 수 있게 하였다. Objects : The purpose of this study was to present a day hospital model(hereinafter called as "this model" ) for integrated therapy, to evaluate the result of performing this model, and thus to develop day hospital model for helping psychotic patients effectively and promoting social re-adaptation. Methods : The authors performed this day hospital model from 1996, May to December. A total of 25 psychotic patients participated in this study. BPRS, Life Satisfaction Se1f-Rating Scale, Program Helpfulness Scale, 13 Therapeutic Factors Scale, and Most Important Event Questionnaire were used at the start of day hospital treatment and at the end. Results : The results were as fo11ows : 1) In this model, It was possible to offer the wide treatment to heterogeneous patients who varied in age, number of admission, duration of illness, and functional level. 2) In the aspect of therapeutic effect, this model contributed for improving negative symptoms and increasing subjective life satisfaction 3) When the patients were divided into the higher functional level group and the lower functional level group, the higher functional level group set a high value on group psycho-therapy and psychodrama that were unstructured and could make patients explore their inner side deeply. But the lower functional level group did not so. Therefore dividing into two groups by functional level may be more effective for day hospital treatment. 4) Therapeutic factors were different between the periods of der hospital treatment. And in the higher functional level group, 'interpersonal learning' was important at the last period, but in the lower functional level group, 'socializing technique' was important at the last period. So long-term group psychotherapy may be more suitable for the artier-care of the higher functional level group, and day care or other psychosocial rehabilitation programs may be more suitable for the after-care of the lower functional level group. 5) This model was easy to apply to Korean day hospital setting, and made staffs treat patients efficiently. Conclusion: This day hospital model would be used effectively and efficiently in Korean day hospital setting.

열에너지 다소비 산업설비 스마트설계 플랫폼 기술

이욱현(Wook-Hyun Lee),이대근(Dae-Keun Lee),이민정(Min-Jung Lee),이후경(Hoo-Kyung Lee),이성곤(Seong-Kon Lee),이민규(Min-Gyu Lee) 한국에너지기후변화학회 2021 한국에너지기후변화학회 학술대회 Vol.2021 No.5

Determination of Tumor Boundaries on CT Image Using Unsupervised Clustering Algorithm

Kyung Hoo Lee,Young Hoon Ji,Dong Han Lee,Seoung Yul Yoo,Chul Koo Cho,Mi Sook Kim,Hyung Jun Yoo,Soo Il Kwon,Jun Chul Chun 대한방사선방어학회 2001 방사선방어학회지 Vol.26 No.2