로봇 포도수확기를 위한 엔드이펙터 개발

이대원,김현태,이용국 성균관대학교 생명공학연구소 2001 生命工學硏究 Vol.7 No.1

Most of fruits need laboring greatly to harvest fruit in the period of harvest season. Grape also needs requiring a lot of labor to harvest in time, since harvesting of grape is cut and graped by hand. At abroad, especially, a harvester of grape, which is not eat freshly raw grape fruit but is processed to be made wine, was developed in France. However, a harvester of grape which can eat freshly raw grape fruit haven't not been developed. Therefore, this study was designed and constructed to develope an end effector of the robotic harvesting system. In order to find average and standard deviation of size and shape of a bunch grape, the grape farm was visited and investigated to find out the important factors for end effector to be designed and built. The efficient end-effecter should reach very well a bunch of grape without touching obstacles, such as leaf and stem in the grape vine. Also, it was made as simple, small and light as possible. Therefore, It was made of duralumin, which was lighter material than iron, to reach easily fresh grape fruit and reduce a torque. After finding the optimum initial speed, slew speed, ramp speed, the end effector proved to be a smooth operating end effector. For verifying efficiency of the end-effecter, the control board was designed and manufactured, and also developed the software to control the motors of the end effector.

혼합형 자가면역성 용혈성 빈혈을 동반한 전신성 홍반성 루푸스 1예

이승철,김선임,이승훈,이현경,조남국,한성훈,유영진,조종래 인제대학교 2000 仁濟醫學 Vol.21 No.2

A 17-year-women developed mixed warm and cold antibody type autoimmune hemolytic anemia associated with systemic lupus erythematosus. The patients was admitted to our hospital for syncope. Jaundice was observed. Urinalysis revealed protein and hemoglobin. Her hemoglobin was 4.6g/dl and reticulocytes were 10%. Total bilirubin was elevated, while haptoglobin and complement were abnormally reduced. ANA and mitochondrial Ab were detected. The direct and indirect Coombs test were positive. The direct antiglobulin test was positive ; IgG and C3d were detected on the red cell surface. The cold agglutinin(CA) titer was 128. The patients was initially treated with high dose steroid therapy. However the patients did not responded to high dose steroid therapy. We treated the patients with plasmapheresis and synchronized cyclophosphamide therapy. Clinical remission of hematologic complications was achieved in this patients. We report a case of mixed type autoimmune hemolytic anemia with SLE that responded plasma pheresis and synchronized cyclophosphamide therapy.

신부전이 동반된 당뇨병 환자에서 발생된 침습성 모균증 : 수술과 Liposomal amphotericin B 및 GM-CSF 병합 요법에 의한 성공적인 치험 1예

이원영,오기원,임국희,장재혁,이동건,최정현,강무일,신완식,차봉연,이광우,손호영,강성구 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.4

저자들은 신부전이 동반된 당뇨병 환자에서 발생된 부비동형 모균증에 대하여 수술과 함께 liposomal amphotericin B 및 GM-CSF의 복합치료를 하여 성공적으로 치료한 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Mucormycosis (zygomycosis) primarily affects diabetic or immunocompromised patients and typically progresses rapidly, necessitating surgical excision and antifungal therapy with amphotericin B. Large doses of amphotericin B are needed for cure, but it has the risk of causing significant renal toxicity. The recent development of liposomal amphotericin B allows antifungal therapy to be administered with potentially improved efficacy and reduced nephrotoxicity. We have experienced a case of paranasal mucormycosis successfully treated with surgery, liposomal amphotericin B and GM-CSF. A 59-year-old male suffering from diabetes mellitus for 6 years was admitted with pain at left maxillary area. He was diagnosed as mucormycosis after cytologic exam on the necrotic nasal mucosa, which showed typical hyphae. He have had diabetic nephropathy with macroproteinuria and had rapidly rising serum creatinine levels with the amphotericin B treatment: creatinine levels reverted to basal level with the use of liposomal amphotericin B. Despite surgical excision and continued antifungal therapy, his infection was not effectively controlled. Therefore, GM-CSF was administered additionally to improve phagocytic activity of leukocytes. He was finally cured after receiving a combination of aggressive surgery, liposomal amphotericin B and GM-CSF. To our knowledge, this is the first detailed clinical description of the treatment of mucormycosis with liposomal amphotericin B in Korea.

Phage 항원성에 미치는 trypsin의 영향

이현국,양남웅,서재홍 朝鮮大學校 附設 醫學硏究所 1992 The Medical Journal of Chosun University Vol.17 No.1

In order to investigate the effect of trypsin(TP) on the phage antigenicity, the Klebsiella phage-host cell system and sheep red blood cells were used, and the results were as follows. The neutralization velocity of Tp-treated phage(Tp phage) by anti-normal phage serum was faster than that of normal phage. And, the neutralization of normal phage by anti-Tp phage serum was remarkably worse than that of Tp phage. The normal phage - neutralizing activity of the anti-normal phage serum absorbed with Tp phage was very weak. However, the anti-Tp phage serum absorbed with normal phage still considerably neutralized the Tp phage. The cold phage hemagglutination(CPH) by normal and Tp phage was most favourable when the reactions are carried out with each phage-correspondig antiserum. The anti-normal phage serum absorbed with Tp phage and the anti-Tp phage serum absorbed with normal phage still formed, with each corresponding phage, the CPH. The neutralization of Tp phage, by anti-normal phage serum, Passed two times through host bacteria and that of Tp phage, by anti-Tp phage serum, Passed three times through host bacteria were similar to the neutralization of normal phage by each antiserum. If the Tp phage is passed two times or three times through host bacteria, the forming capability of CPH by each phage bacame similar, under the anti - normal and anti - Tp phage sera, to that of normal phage. The absorption of Tp phage to host bacteria was a little faster than that of normal phage. If the Tp tretment of phage is done for 48hours at 37℃, the surviving titer was reduced to around 40%.

교수 학습 순서에 따른 화학 변화 관련 개념 획득 정도의 비교 연구

李惠爛,柳五鉉,林光秀,白盛惠,朴國泰 한국교원대학교 과학교육연구소 1999 청람과학교육연구논총 Vol.9 No.1

중학교 2학년 과학 교과서 물질의 구성 단원의 주요 개념인 화학 변화 관련 개념을 학습함에 있어 논리적 위계에 따라 제시된 과학 교과서의 교수 학습순서인 화학 변화→원자→분자→분자 운동과, 분자와 원자를 화학 변화의 선행 조직자로 하여 새롭게 배열한 분자→분자 운동→원자→화학 변화의 교수 학습 순서 중, 어떠한 교수 학습 순서가 화학 변화 관련 개념을 이해하는데 효과적인가를 알아보았다. 이를 위하여 서울에 위치한 1개 중학교에서 남, 여 학생 각각 2개 반 씩 168명을 표집하여 실험반과 통제반으로 나누어 연구를 실시하였다. 연구 결과, 과학 교과서에서 제시하고 있는 교수 학습 순서 보다 본 연구에서 새롭게 배열한 교수 학습 순서가 학생들의 화학 변화 관련 개념 이해에 효과적이었음을 나타내었다. 그러나 학생들은 수업 처치가 효과가 있었음에도 불구하고 혼란스러웠다는 문제점을 제기하였으므로, 학생들에게 혼란스러움을 주지 않으면서도 효과적인 개념 학습을 위해서는 모든 과학 교과서의 획일적인 교수 학습 순서를 지양하고 교과서마다 특색 있고, 다양한 교수 학습 순서를 제시하는 것이 필요할 것으로 생각된다. This study was to investigate the effective order of instruction for students learning the concepts of chemical change. Chemical change was considered as the important area in 8th grade chemistry part. The study consisted of 168 8th grade students, two classes of boys and girls each, from a middle school in Seoul. They were divided into two groups, the experimental group and the control group. The control group was taught in the order, which was presented in the science textbook; chemical change, atom, and molecule(CAM). For the experimental group, the order was molecule, atom, and chemical change(MAC). From the results of the study, there was a statistically significant difference between the control group and the experimental group. But the interviews indicated that the students were confused with the MAC method in spite of the effective learning. Therefore, for more effective concepts learning without a confusion, we need to provide our students with various learning sequences of science textbooks rather than fixed learning sequences.

Compass 연산자를 이용한 Edge의 방향정보 표현

이병일,최현주,최흥국,전순미 인제대학교 1998 仁濟論叢 Vol.14 No.1

에지(edge)의 검출은 영상처리를 하기 위한 전처리 단계로서 중요하고도 기초가 되는 부분이다. Compass 기울기 연산자는 방향에 따른 마스크를 사용하여 에지를 검출하여 주는데, 본 논문에서는 이러한 Compass 기울기 연산자를 이용하여 찾아지는 에지를 방향에 따라서 색상을 지정하여 표현함으로써 에지 정보의 방향성을 시 각화하도록 하였다. 예제 이미지는 임의의 타원으로 구성된 실험용 이미지와 다른 하나는 쥐와 운동 신경조직을 현미경으로 확대하여 본 이미지이다. Digital Image Processing is divided into two branches. One is Improvement of Image Information which helps human beings to understand image, and another is Image Data Analysis which helps the machine to have cognizance of image. Edge Detection is indispensable part to apply two branches, for it is basic application. Edge Detection is important and basic preprocess at Image Processing. Edge can be found by Compass operator as direction with 3×3 Masks. Compass operator has 8 element to be compared. Each has an information about direction of an edge. To visualize edge information, We propose the method of edge detection as direction showed by color. First, We had experiment on 4-Direction, then on 8-Direction. 8-Direction 8-Color method was better than 4-Direction 4-Color method, for Compass operator had 8 elements. Result Image shows the color which has direction information.

이동통신망에서 유전알고리즘을 이용한 동적 자원관리기법 연구

이현정,박재현,김정국 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

In this paper, a new grouping optimization scheme is proposed, which is a part of the dynamic resource management in mobile communication environments. The Proposed scheme dynamically optimizes the distribution of macro cells according to traffic deviation between sectors in CDMA optical micro cell system which has the multitier cell structure. For the efficient use of limited communication resources, an optimal sector structures are searched through the genetic algorithm and the remote antenna groups are dynamically reconstructed. From the simulation results, we can confirmed that the proposed method not only reduces the hand-off rate but also increases the reserved call capacity of each sector.

경기적 Sports 클럽의 경영요인 분석

정국현,이신언,이명섭 한국스포츠리서치 2001 한국 스포츠 리서치 Vol.12 No.4

Analysis of Management Elements in Athletic Sports Club. The purose of this study was to analyze the management elements in athletic sports club and to clarify the relation between the results in competitions and the intermedialte variables such as the aim of their activity and the morale chments. The main results were summarised as follows : 1. High competitive level group showed higher morale point and higher argreement rate concerning the aim of activity than low level group. 2. The following four patterns were categorized according to the results in competitions and the aim of activity. P1: competitive and high performance level P2: competitive and low performance level P3: recreational and high performance level P4: recreational and low performance level 1) Applying Hayashi's quantification theory Ⅱ, P1 and P4 were found to be the most contrastive pair. (correlation ratio=0.697, discriminant power=97.9%) 2) The secondary contrastive pair was P2 and P1(0.474, 88.9%) 3) The least contrastive pair was P3 and P4 (0.237, 73.4%) 3. Analysing by partial correlation coefficient, the main distinctive items may be the elements concerned with a coach and morale(especially, the factors of membership) It is very important for the administrators to control these elements. At the same thime the administrators should take the leadership or organizational behavior in consideration of the four different patterns.

유사체액에서의 전기화학적 처리가 티타늄 표면의 인산갈슘 흡착에 미치는 영향

조국현,김문영,송광엽,배태성,이민호 大韓齒科器材學會 2002 대한치과재료학회지 Vol.29 No.3

This study was performed to examine the effect of electrochemical treatment on the precipitation of apatite-like calcium phosphate in a simulated body fluid. Titanium plates of 20×20×1 ㎣ in dimensions were polished sequentially from #600 to #2,000 emery paper and one surface of each specimen was received an additional polishing sequence through 0.1㎛ alumina paste. To improve the bioactivity of titanium plates, they were electrochemically treated at 100 mA for 20 min in an electrolyte containing the calcium and phosphate ions, and the Hanks' solution with pH 7.4 at 36.5℃ for 30 days, and the surfaces were examined with X-ray diffractometer(XRD), scanning electron microscope(SEM) and X-ray photoemission spectroscopy(XPS). Precipitation of calcium phosphate and CaO were observed on the electrochemically treated titanium surface in a simulated body fluid after treatment at 600℃. Precipitation of calcium phosphate was densified and coarsened with increasing the temperature of the electrolyte solution in the range of 20-80℃. The calcium phosphate contained phosphate in the form of Po₄^3-, HPO₄^2-, and H₂PO₄^-.

전도성 충전물을 이용한 도전성 판재의 제조기술 개발

남효덕,이현석,박봉국 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.1

As an effort of developing efficient materials for shielding EM waves, a fibrous sheet for shielding EMI is developed by adding conductive filler to fibrous sheet during hardening process. From the aspect that the conductivity is inversely proportional to the square value of the length of added material, the conductive filler is fabricated by electroless plating with nickel and copper to the polymer textile power which has very high anisotropy. The conducting sheet was also fabricated by applying proper amount of highly efficient conductive filler to the fibrous sheet. The results obtained by measuring the shielding characteristics of 1㎒∼1㎓ frequency range showed the EMI suppressing effectiveness of 10∼20 ㏈.