탄소섬유 프리프레그 외부 표면 적층방법에 따른 하이브리드 샤프트 진동특성

홍동표,김현식,홍용,고유곤,유청환 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

Studies on carbon fiber epoxy composite is being conducted broadly in industries because of its specific stiffness, specific strength and good fatigue resistance. Because carbon fiber epoxy composite has high vibration characteristics, if existing metal material is alternated by carbon fiber epoxy composite, structure will be low weight, satisfy 1st bending natural frequency and have high fatigue resistance. In this study, research on to manufacture hybrid propeller-shaft using carbon fiber epoxy composite instead of current steel propeller shaft of rear wheel drive vehicle. For this, change of 1st bending natural frequency by the number of layers of carbon fiber epoxy composite on the outer surface of aluminum shaft was observed. Compared the change of 1st bending natural frequency by FEA with computer simulation and vibration test. Through this, the amount of increase in 1st bending natural frequency of hybrid shaft by the increase in number of layers of carbon fiber epoxy composite and high vibration characteristics of hybrid shaft was acknowledged.

赤芍藥 藥鍼이 白鼠의 抗血栓 效果에 미치는 影響

洪儒聖,黃祐準 한국전통의학연구소 1998 한국전통의학지 Vol.8 No.2

This study was performed to prove the antithrombotic effects of paeonia japonica(赤芍葯, PJ) aqua-acupuncture solution by way of experimental methods. the thrombosis was induced by injection of collagen the mixture (0.1ml/10g, 2mg/kg B.W) plus serotonin (5mg/kg B.W) into the caudal vein of rats, 2 hours after liquid extract of paeonia japonica(PJ) was acupunctured into 'Taechung'(太衝:Liv3) of rats. The effect of aqua-acupunctures of paeonia japonica(PJ) was examined by the number of RBC and platelets, bleeding time, blood clotting time, death rate, platelet aggregation, plasma coagulation factor activity, exvivo and vitro fibrinolytic activity of englobulin fracture in the rats. The results were summerized as followings. 1. The number of RBC and platelets was significantly increased in PJ-treated group in comparison with the control group. 2. Bleeding time was significantly shortened in PJ-treated group in comparison with the control group. 3. Blood clotting time was significantly prolonged in PJ-treated group in comparison with the control group. 4. The death rate of mouse was inhibited in PJ-treated group in comparison with the control group. 5. The platelet aggregation was inhibited in PJ-treated group in comparison with the control group. 6. The prothrombin time and activated partial thromboplastin time on the test of plasma coagulation factor activity was prolonged but was not valuable in PJ-treated group. 7. Fibrinogen lyses time of rat was reduced and lyses area was increased in PJ-treated group in comparison with the control group. 8. Fibrinogen lyses time of rat in vitro assay was reduced in PJ-treated group. From the above results, it was thought that the aqua-acupuncture of PJ could be applied effectively in the thrombosis.

TEMPOL(??)에 대한 전자 스핀 공명 연구

유홍용,한찬수 순천향대학교 기초과학연구소 1999 순천향자연과학연구 논문집 Vol.5 No.1

Electron spin resonance studies of the free radical TEMPOL have been carried out at room temperature. The ESR spectra have 3 hyperfine lines due to interactions with the nuclei of nitrogen of the radical. As results of our analysis, the ESR parameters have been found that ??, ??. From the hyperfine interaction with a nucleus of nitrogen, it is suggested that the magnetic electron in the radical is localized around the nucleus.

마이크로 프레스 구동을 위한 기어시스템 개발

홍용,김현식,고유곤,홍동표,김성욱 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

In this paper, gear system for Micro-press actuator parts is developed. The micro-press system consists of AC geared servo motor, gear system and high precision ball screw. Herein, the micro-press gear system not only forms the micro thin foil valve but also forms the hydro dynamic bearing for a high precision rotational equipment, we analyzed the transmitted power capacity of gear system and torque, angular velocity of ball screw, because we are to select the appropriate servo motor and then we apply result of analysis to the micro press system. For the next step, we plan to study for the development of forming speed for a productivity with high precision.

마이크로 프레스 구동을 위한 기어시스템 개발

홍용,김현식,고유곤,홍동표,김성욱 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

In this paper, gear system for Micro-press actuator parts is developed. The micro-press system consists of AC geared servo motor, gear system and high precision ball screw. Herein, the micro-press gear system not only forms the micro thin foil valve but also forms the hydro dynamic bearing for a high precision rotational equipment. we analyzed the transmitted power capacity of gear system and torque, angular velocity of ball screw, because we are to select the appropriate servo motor and then we apply result of analysis to the micro press system. For the next step, we plan to study for the development of forming speed for a productivity with high precision.

전통조경요소의 키치적 변용과 그 양상

홍형순,이유경,김도경 한국정원학회 2002 한국전통조경학회지 Vol.20 No.4

This study aims to reveal the immanent cultural significance of traditional landscape elements that are modified into Kitsch and introduced in urban scenery. Traditional landscape elements are closely related to traditionalism and folk features ; they provide a basic framework for a system of thought in designing the landscape by introducing traditional landscape elements to modern urban scenery. The case study method was used to interpret the objective phenomena. Specifically, the descriptive study method was used to understand a certain phenomenon by determining its traits through the case study. This study covers traditional landscape elements that have been modified into Kitsch landscape elements as seen in urban scenery. Traditional landscape elements are classified by viewpoints of purposes. However, this study deals with only visible elements such as landscape constructions and facility elements and planting elements as subjects. Based on previous studies, this study focused on the following elements; 1) inadequacy/ incoherence elements; 2) accumulated/excessive elements; 3) conventional comfort/nostalgic elements; 4) exaggeration elements; 5) amusable satisfaction elements, and; 6) mosaic cultural elements. Kitsch as a cultural phenomenon was found to be prevalent in the area of landscape architecture. However, it has not attacted condiderable attention to date. An enhanced system of thought is therefore necessary for applying traditional landscape elements in the modern times, by analyzing and reviewing the cultural phenomana of Kitsch largely found in urban scenery. Likewise, an analysis considering how people recognize Kitsch-styled traditional landscape elements is recommended.

남편의 폭력이 아내의 정신병리에 미치는 영향 : 자아 탄력성, 대처양식, 사회적 지지를 중재변인으로

홍창희,박유숙 부산대학교 심리과학연구소 2001 심리과학연구 Vol.2 No.-

본 연구는 남편의 폭력이 아내의 정신병리에 미치는 영향을 알아보고자 하였다. 아내의 자아 탄력성, 대처양식, 사회적 지지가 매개변인 혹은 중재변인으로 고려되었다. 연구대상은 남편에게 폭력을 당하지 않는 아내 45명과 남편에게 폭력을 당하는 아내 159명이었다. 본 연구의 결과는 다음과 같다. 1. 남편에게 폭력을 당하는 아내는 폭력을 당하지 않는 아내에 비해 자아 탄력성이 낮고 사회적 지지를 덜 받았다. 그리고 적극적인 대처와 소극적인 대처를 많이 하였다. 2. 남편에게 폭력을 당하는 아내는 폭력을 당하지 않는 아내에 비해 PTSD 증상과 우울, 무기력이 심했다. 3. 남편에게 폭력을 당하는 아내의 PTSD 증상은 폭력 3~7년 사이에 가장 심하였고 우울은 폭력 기간의 초기 4년까지 심해지다가 그 이후에는 고착되는 경향이 있었으며 무기력은 시간이 지나면서 점차 누적되는 경향이 있었다. 4. 적극적 대처는 기존 연구와는 달리 폭력정도, PTSD 증상과 정적 상관이 있었다. 5. 자아 탄력성은 남편의 폭력에 중재변인 보다는 매개변인으로서 효과가 있었다. 본 연구의 결과는 남편의 폭력이 장기적으로 아내를 우울, 무기력하게 만드는 외상적인 사건으로 개념화 될 수 있음을 시사한다. 또한 가정폭력에 대한 적극적인 사회적 구호체제의 확립과 조기 개입의 필요성을 시사한다. 아울러 아내의 자아탄력성이 개입프로그램에서 우선적으로 고려해야할 개념임을 시사한다. 마지막으로 본 연구의 의의와 한계점이 논의되었다. The purpose of this study was to examine the effects of violence of husband on psychopathology of wife. Ego-resiliency, coping styles of wife, and social support were considered as mediating or moderating variables. Subjects were 45 non-battered wives and 159 battered wives. The results of this study as follows : 1. In case of battered wives, ego-resiliency and social support were low. And they showed more active and passive coping. 2. Battered wives showed severe symptoms of PTSD, depression and helplessness. 3. For battered wives the symptoms of PTSD were severe in 3-7 years of violence. Depression seemed to be most severe in first 4 years and didn't make such changes after that. Helplessness became stronger. 4. Inconsistent with early studies, active coping skills correlate positively with intensity of violence and PTSD. 5. Ego-resiliency is most appropriate as a mediator. The results of this study suggest that violence of husbands can be considered as a traumatic event witch makes wives to be depressive and helpless for long time. Social support network and early interventions for battered wives are requested. Also the results suggest ego-resiliency of battered wives should be considered first in the intervention program. Lastly, implication and limitation were discussed.

데스크탑 마이크로 성형시스템의 가진성형에 따른 동특성 연구

홍동표,고유곤,홍용,김현식,이재완 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

In this study, a desktop forming system which enables hydro dynamic bearing forming was developed. It consists of power train system, frequency forming system, manufactured Die-set, and controller of desktop forming system. The desktop micro forming system is focused on a higher load capacity and a shorter forming time than conventional system. Therefore it was designed for power train capability and load condition of Ball Screw. Moreover, a Piezo actuator was installed to make accurate machining possible, however, the Piezo actuator generate noise and vibration. Thus we performed the analysis of dynamic characteristics through the experiment about developed system in order to reduce such problems and discuss the alternative methods.

새로운 다중 전류원 인버어터의 개발

유철로,김홍규,이공희,이성룡 全北大學校 1992 論文集 Vol.34 No.-

A new multiple current source inverter for reducing the harmonics in output current is presented in this study. Condenser capacity necessary for the inverter design is decided by the commutation analysis of current source inverter with induction motor as load. And the proposed system operates 24 phase inverter by adding only tap changing circuit which consists of several taps and static switching elements to the 12 phase inverter, which is the double connected 6 phase inverter with an interphase reactor. Also to optimize the effectiveness of the harmonic reduction, the optimum turn ratio and tap changing control angle of interphase reactor are decided by digital simulation and its validity is verified with experiment. And under the optimum condition, it is clarified that the harmonics components involved in the output currents of the proposed inverter are nearly equal to those of the conventional 24 pulse inverter.

Spheroid 조합자극치료 적용이 신체구성에 미치는 영향

홍성찬,김영빈,정동혁,박병근,김유성,이성진 원광대학교 체력과학연구소 2008 體力科學硏究 Vol.30 No.1

The present study aims to explore the effects of applying spheroid-combined stimulating therapy on body composition. For this aim. 20 persons were selected as subjects and 10 of them each were assigned to the experimental group and control group, respectively. The experimental group was applied a 12-week combined stimulating therapy and changes in physical constitution of the members were measured before application and 4, 8 and 12 weeks after application. From the study, following conclusions could be drawn: First, body weights of the experimental group decreased from 59.9kgs before application of the spheroid-combined stimulating therapy to 57.2kgs 12 weeks after application, no significant but 4.51% change. Second, body fats of the experimental group changed from 18.8kgs before application to 16.4kgs 12 weeks after application, no significant but 12.77% reduction. Third, % fats of the experimental group decreased from 31.2% before application to 28.6% 12 weeks after application, no significant change but 8.33% reduction. Fourth, body mass index(BMI) of the experimental group decreased from 23.23 kg/㎡ before application of the therapy to 21.43kg/㎡ after application, no significant but 8.03% reduction. As seen above, the 12-week application of the spheroid-combined stimulating therapy produced no significant changes in physical constitution as physical exercise did, but improved physical constitution by reducing certain amount of boy weight, body fat, % fat and BMI. In order to detect more positive and significant changes in physical constitutions, continued studies and clinical experiments should be performed to more diverse subjects using technically reinforced equipment for spheroid-combined stimulating therapy.