녹용사근환약침(鹿茸四斤丸藥鍼) 및 경구투여(經口投與)가 흰쥐의 성장(成長)과 지능발달(知能發達)에 미치는 영향(影響)

강기원,고형균,이윤호,Kang, Ki-weon,Koh, Hyung-kyun,Lee, Yun-ho 대한침구의학회 2003 대한침구의학회지 Vol.20 No.6

Objective: This study was designed to investigate effects of Nokyongsageunhwan and Nokyongsageunhwan aquapuncuture on body weight, body length, intellectual development Methods: We observed body weight, body length, intellectual development after feeding Nokyongsageunhwan and Nokyongsageunhwan aquapuncuture for thirty three days, and mRNA expressions of GHRF, Somatostatin, IGF-1, NPY were analyzed by RT-PCR method. Results: The results were summarized as follows. 1. Body length was significantly increased in Nokyongsageunhwan herbal acupuncture group compared to normal group and normal saline injection group on 4th week, 2. Lower part of hind leg length was significantly increased in Nokyongsageunhwan oral administration group compared to normal group on 3rd week, and it was significantly increased in Nokyongsageunhwan herbal acupuncture group and Nokyongsageunhwan oral administration group compared to that of normal group on 4th week. 3. As results of observing memory aquisition using Morris water maze system, there was significantly difference in Nokyongsageunhwan oral administration group compared to that of normal group on 4th week. 4. As results of observing retention using Morris water maze system, staying time was significantly increased in Nokyongsageunhwan herbal acupuncture group compared to that of normal group. 5. The somatostatin mRNA expression in the hypothalamus was significantly decreased in Nokyongsageunhwan oral administration group compared to that of normal group. 6. The IGF-1 mRNA expression in the hypothalamus is significantly increased in Nokyongsageunhwan herbal acupuncture group and Nokyongsageunhwan oral administration group compared to that of normal group. 7. The NPY mRNA expression in the hypothalamus was significantly increased in Nokyongsageunhwan oral administration group compared to that of normal group, and it was increased in Nokyongsageunhwan herbal acupuncture group compared to that of normal group, but there was no significant difference. Conclusions: According to the above results, it appears that Nokyongsageunhwan oral administration and Nokyongsageunhwan herbal acupuncture on acupoint GB34 and GB39 showed effects on the growth and the intellectual development of rats.

애구(艾灸)의 연소(燃燒) 구간별(區間別) 열량비(熱量比)에 대(對)한 연구(硏究)

강기원,남상수,이재동,최도영,안병철,박동석,이윤호,최용태,Kang Ki-Weon,Nam Sang-Soo,Lee Jae-Dong,Choi Do-Young,Ahn Byoung-Choul,Park Dong-Seok,Lee Yun-Ho,Choi Yong-Tae 대한침구의학회 1998 대한침구의학회지 Vol.15 No.2

In order to evaluate calorie rate of moxa-combustion(direct moxibustion=DM, indirect moxibustion with stainless steel tube=IMS, indirect moxibustion with ginger slice=IMG), calorie rate(%) in the preheating period, heating period, retaining period, and cooling period was calculated respectively to the total combustion calories in all the periods. The result are as follow: 1. Indirect moxibustion with stainless steel tube had the highest rate with the statistical significance than other groups during the preheating period, represented statistical differences between IMS group and IMG group, and also between DM group and IMS group. 2. Indirect moxibustion with ginger slice group showed the highest rate with the statistical significance and followed by DM group and IMG group during the heating period, represented statistical difference among DM, IMS, and IMG group. 3. Direct moxibustion group had the highest rate with the statistical significance than other group during the retaining period, represented statistical difference between DM group and IMG group, and also between DM group and IMS group. 4. Indirect moxibustion with stainless steel tube had the highest rate with the statistical significance than other groups during the cooling period, represented statistical differences between IMS group and IMG group, and also between IMS group and DM group.

초등 사회과 교실 수업의 이해 - 초등 교사의 상황적 조건을 중심으로 -

강기원(Kang Ki-weon) 한국열린교육학회 2004 열린교육연구 Vol.12 No.2

본 연구의 목적은 초등 교사로서의 상황적 조건들이 무엇이며 이러한 조건 속에서 초등 교사들이 어떠한 수업 형태를 자주 보여주는지 이해하는 데 있다. 이를 위해 본 연구는 초등학교 사회 교과를 중심으로 두 교사를 대상으로 한 해석학적 사례 연구(interpretive case study)를 수행하였다. 3학년 이상의 학년을 맡는 초등학교 교사들이라면 원칙적으로 1주일에 10개 교과와 30시간 안팎의 수업을 하게 된다. 초등 교사의 교실 수업은 수업의 일회성을 특징으로 한다는 점에서 중등 교사의 교실 수업과 구별된다. 이것은 수업의 반복적 재현을 어렵게 함으로써 수업에 대한 반성적 구조화를 어렵게 한다. 초등 교사는 수업 이외에도 담임 교사로서 수업과 직간접적으로 연관된 교육활동괴 각종 업무를 동시에 처리해야 한다. 이러한 상황적 조건 속에서 두 교사는 특정한 수업 형태를 자주 보여 주었다. 본 연구는 초등 교사의 상황적 조건 속에서 두 교사의 수업 형태가 갖는 문제점을 논의하고 초등 학교 교실 수입 개선을 위한 제언을 하였다. The purpose of this study is to understand the situational conditions under which elementary teachers are and their teaching patterns under the conditions. I conducted an interpretive case study including two elementary teachers. I made efforts to understand which situational conditions elementary teachers are. I observed social studies classes of two elementary teachers in charge of 6th grade. The two elementary teachers teach 10 subject matters for 32 class periods in a week and also conduct the tasks related to teaching or non-teaching. Under those situational conditions, the two teachers continued some special teaching patterns of social studies. This study makes some suggestions to improve elementary teachers in their teachings.

충격손상 복합재료의 피로수명에 대한 통계적 해석 연구

강기원(Kang, Ki-Weon) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.9

본 논문에서는 충격손상 복합재료의 피로수명 저하 특성과 이의 변동성을 통계적으로 분석하였다. 충격손상 복합재료의 잔류강도는 2모수 Weibull 분포에 잘 적합되었으며 충격에너지의 증가에 따라 잔류강도의 변동성은 감소 하였다. 복합재료의 피로수명은 충격손상에 의하여 크게 저하되었으며 또한 이의 피로수명에 대한 충격손상의 영향은 작용 응력진폭에 따라 변화함을 알 수 있었다. 또한 2모수 Weibull 분포를 이용하여 충격손상 복합재료의 피로수명의 변동성을 추정하였으며 충격에너지의 증강 및 응력진폭의 감소에 따라 피로수명의 변동성은 점차 감소하였다. This paper presents the probabilistic analysis for fatigue life of Glass/Epoxy laminates with impact-induced damage. For this, a series of impact tests were perfomed on the Glass/Epoxy laminates using instrumented impact testing machine. Then, tensile and fatigue tests carried out so as to generate post-impact residual strength and fatigue life. Two Parameter Weibull distribution was used to fit the residual strength and fatigue life data of Glass/Epoxy composite laminates. The residual strength was affected by impact energy and their variance decreased with increasing of impact energy. The fatigue life of impacted laminates was greatly reduced by impact energy and this trend depended on applied stress amplitude. Additionally, the variation of fatigue life was gradually decreased with the applied stress amplitude.

브레이징 접합부의 고장원인 및 강도 특성 평가

강기원(Ki-Weon Kang),이병재(Byung-Jei Lee),장경영(Kyung-Young Jang),김정규(Jung-Kyu Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5

In order to understand failure cause and stress analysis, strength evaluation of joints and non-destructive test were done for brazing joint of copper pipe in household air conditioner. Strength of brazing joint was evaluated by shear test and test specimens were used by standard single lap form and actual form of brazing joint in copper pipe. In order to evaluate the effect where the temperature has an influenced on the joint during this brazing joint processing, micro vickers hardness is measured. Also, three dimensional X-ray non-destructive test was used to know defect existence of brazing joint. Internal pressure breaking tester was designed and was performed to make higher oil pressure by specific ratio within the interval of time.

장기 운영 항공기 주익 구조물의 응력스펙트럼 및 피로수명 추정에 관한 연구

강기원(Ki-Weon Kang),고승기(Seung-Ki Koh),최동수(Dong-Soo Choi),심기중(Ki-Joung Shim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11

Aged Aircraft has the several cracks due to the long-term service and these cracks deteriorate the safety and the rate of operation. To solve this, the crack propagation analysis for flight critical location is of utmost required. maneuver. It is, however, almost impossible to obtain the stress spectrum, which is crucial for the crack propagation analysis, at the FCLs of aged aircraft wing structure. In this study, to analyze the fatigue crack propagation behavior at FCL in aged aircraft, firstly the finite element analysis is performed for the 3D geometry model of wing assembly, which is obtained using CATIA from the paper drawings. And then, transfer function and stress-spectrum at FCL are derived from based on the limited load factor data and the FEA results. Finally, crack propagation rates at the FCL are analyzed using the commercial code, NASGRO.

Wind Turbine Blade Design using Design of Experiments

강기원(Kang, Ki-Weon),이승표(Lee, Seung-Pyo),장세명(Chang, Se-Myong),이장호(Lee, Jang-Ho) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11

This paper describes the structural design of small wind turbine blade by using design of experiments. Blade structure consists of skin, spar and foam. The materials for skin and spar are a kind of Glass/Epoxy and form is polyurethane. It has 7 lay-ups with different ply angle. A factorial design is applied to design the ply angles considering manufacturing constraints and to investigate the safety factor which is calculated by structural analysis. In order to perform the structural analysis, the commercial software ABAQUS is used. Tsai-Wu failure criterion is chosen to compute safety factor. The determination of the significance of effects in the experiments is made through the analysis of variance. The results show that ply angle at skin affects the safety factor of wind turbine blade. And from this result, optimal ply angles of composite blade are achieved.

항공기 주익 구조물의 응력스펙트럼 및 피로수명 추정에 관한 연구

강기원(Ki-Weon Kang),고승기(Seung-Ki Koh),최동수(Dong-Soo Choi),김태성(Tae-Sung Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4

Aged Aircraft has the several cracks due to the long-term service and these cracks deteriorate the safety and the rate of operation. To solve this, the crack propagation analysis for flight critical location is of utmost required. maneuver. It is, however, almost impossible to obtain the stress spectrum, which is crucial for the crack propagation analysis, at the FCLs of aged aircraft wing structure. In this study, to analyze the fatigue crack propagation behavior at FCL in aged aircraft, firstly the finite element analysis is performed for the 3D geometry model of wing assembly, which is obtained using CATIA from the paper drawings. And then, transfer function and stress-spectrum at FCL are derived from based on the limited load factor data and the FEA results. Finally, crack propagation rates at the FCL are analyzed using the commercial code, NASGRO.

항공기 주익 구조물의 응력스펙트럼 및 피로수명 추정에 관한 연구

강기원(Ki-Weon Kang),고승기(Seung-Ki Koh),최동수(Dong-Soo Choi),김태성(Tae-Sung Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.9

장기운영된 항공기에는 비행시간의 누적에 따라 다양한 피로균열이 발생하며 이는 운영상 안전성 및 가동률을 저하시키는 요인이 된다. 이의 해결을 위하여 피로임계위치(Fatigue critical location, FCL)에 대한 균열 진전 해석은 매우 중요하다. 그러나 이러한 장기 운영된 항공기의 경우, 균열 진전 해석에 필수적인 FCL에서의 응력 스펙트럼 획득은 거의 불가능한 실정이다. 본 연구에서는 장기운영된 항공기 주익 구조물의 FCL에서의 균열 진전 해석을 수행하기 위하여, 먼저 주익 구조물에 대한 2차원 하드카피 형태의 도면으로부터 구축된 3차원 CAD 모델에 대한 유한요소해석을 수행하였다. 또한 이러한 유한요소해석 결과 및 제한된 하중배수 자료를 기반으로 FCL에서의 전달함수와 응력 스펙트럼을 산출하였다. 상기 자료를 바탕으로 상용 균열 진전 해석 코드인 NASGRO를 이용하여 FCL에서의 균열진전해석을 수행하였다. Aged aircraft have several cracks as a results of long-term service, and these cracks affect the safety and decrease the rate of operation of the aircraft. To solve these problems, crack propagation analysis should be perfomred to determine the service life at fatigue critical location(FCL). It is, however, almost impossible to obtain the stress spectrum, which is crucial for crack propagation analysis of the FCLs of wing structure of aged aircraft. In this study, to analyze the fatigue crack propagation behavior at the FCL of an aged aircraft, first finite element analysis is performed for a 3D geometry model of the aircraft wing structure, which is obtained using CATIA based on the paper drawings. Then, the transfer function and stress-spectrum of the FCL are derived using the load factor data and the FEA results. Finally, the crack propagation rates of the FCL are evaluated using the commercial software, NASGRO 6.0.

장기운영 항공기 주익 구조물의 피로임계부위에 대한 손상허용성 평가

강기원(Ki-Weon Kang),권용규(Yong-Kyu Kwon) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11