암모니아 분위기에서 질산갈륨 염으로부터 질화갈륨 분말의 합성

정우식,한승훈 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

Gallium nitride (GaN) powder was prepared by using a gallium(Ⅲ) nitrate salt in flowing ammonia in the temperature range 600-1050℃. The process of conversion of the salt to GaN was monitored by X-ray diffraction, IR, and ^71Ga MAS (magic-angle spinning) NMR spectroscopy. The salt decomposed to r-Ga_2O_3 and then converted to GaN without r-β Ga_2O_3 phase transition. It is most likely that the conversion of r-Ga_2O_3 to GaN does not proceed through Ga_2O but stepwise via amorphous gallium oxynitride (GaO_xN_y) as intermediates. Room-temperature photoluminescence spectra showed the emission peak at 363㎚. The GaN powders prepared were fused, with its primary particle size being 30-50㎚.

지방자치단체의 재정위기와 대응전략

우동기,이정훈 영남대학교 지역발전연구소 1999 새마을지역개발연구 Vol.25 No.-

Local government experience reduction of Local Tax, increase of public needs, business recession under IMF situation and reduction of dependence revenue(revenue sharing, grants-in-aid, local shared tax). The purpose of this study deals with the finance crisis of local government. So, We had focused on the finance situation of local government. First, this study is to view theoretical examination which conception, type, happening cause of the finance crisis. Second, this study is research to the general situation and analysis on the finance of local government. and the result of analysis on the finance crisis of local government showed the embarrassed finance of business upturn in Korean. Third, this suggest that local-authority of finance, efficiency on employ useable of finance, system of finance examine, credit evaluation system for countermeasure of the finance crisis.

비선형 최적화문제의 해결을 위한 개선된 유전알고리즘의 연구

우병훈,하정진 한국경영과학회 1996 經營 科學 Vol.13 No.1

Genetic Algorithms have been successfully applied to various problems (for example, engineering design problems with a mix of continuous, integer and discrete design variables) that could not have been readily solved with traditional computational techniques. But, several problems for which conventional Genetic Algorithms are ill defined are premature convergence of solution and application of exterior penalty function. Therefore, we developed an Improved Genetic Algorithms(IGAs) to solve above two problems. As a case study, IGAs is applied to several nonlinear optimization problems and it is proved that this algorithm is very useful and efficient in comparison with traditional methods and conventional Genetic Algorithm.

악악면 경조직 발육에 미치는 Bisphosphonate의 영향

한정우,김선헌 전남대학교 치과대학 2001 구강과학 Vol.13 No.2

Bisphosphonates are synthetic derivatives of pyrophosphonates and resistant to destruction by phrophosphatase. Bisphosphonates are currently tested for its use in orthodontic movements, osteoporosis and Paget disease treatment and prevention of metastasis in bone cancer. The effects of bisphosphonates on developing hard tissue and their action mechanism have not been elucidated yet. This study was aimed to invetigate the effects of etidronate and pamidronate, derivatives of bisphosphonate, on hard tissue development and teeth eruption in the jaws using light and electron microscopy and TUNEL stain. The number and size of osteoclasts were also analysed suing Student's test. Both etidronate and pamidronate inhibited teeth development and retarded their eruption. The bony trabeculae of the developing jaws in pamidronate­ treated group were thinner and more immature than those in control group. The size of osteoclasts was not significantly different between control and eitidronate and pamidronate treated groups, whereas the number of osteoclasts for the eruption of the mandibular 1st molar increased in both etidronate and pamidronte treated groups. However, many osteoclasts were detached from bone surface and did not show typical ruffled border in electron microscopic findings in both etidronate and pamidronate treated groups. No TUNEL positive osteoclasts were seen in all groups. Some of the ameloblasts and outer dental epithelial cells were abnomally proliferated and TUNEL positive in both etidronate and pamidronate treated groups. These findings suggest that bisphosphonates can adversely delay the development of the teeth and hard tissue, so that they should be carefully used in clinics.

주행로봇의 경로제어

이우송,오세봉,안용근,한성현 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

This paper propose a new path planning method for mobile robots. The creation method of the course approaches with the method of the frame line graph base where the calculation time becomes disturbance. The graph composition where is not the static course plan method of existing, a course search and repeats continuously changes a graph and proposes the course the dynamic routing plan method. The method which is proposed is composed of a course creation phase and a course improvement phase, each phase includes a graph composition and a course search process.

낙동강중류의 토지피복형태를 고려한 유역별 수질오염도 분석

이우성,정성관,박경훈,유주한 한국환경과학회 2006 한국환경과학회지 Vol.15 No.4

물리적 환경인자를 활용한 도시의 쾌적성 평가

이우성 ( Woo Sung Lee ),곽행구 ( Haeng Goo Gwak ),정성관 ( Sung Gwan Jung ),박경훈 ( Kyung Hun Park ) 한국지리정보학회 2007 한국지리정보학회지 Vol.10 No.1

본 연구는 도시의 물리적 환경인자를 이용하여 쾌적성을 평가하고, 이를 토대로 대기, 수질 등 환경질과의 상관성을 파악하여 쾌적성 평가결과의 실효성을 검증하고자 한다. 물리적 환경인자는 공원·녹지, 경관, 수환경, 토지이용의 항목으로 분류하고, 11개의 세부인자를 설정하였다. 설정된 인자를 토대로 GIS 도면을 작성한 후, 중첩분석을 이용하여 최종적인 쾌적성 평가도면을 작성하였다. 분석결과를 살펴보면, 1, 2등급은 전체면적의 40.8%로 행정구역상 달성군, 동구, 수성구를 중심으로 나타났으며, 쾌적성이 낮은 6~7등급은 중구, 서구, 달서구 등을 중심으로 전체의 5.7%를 점하고 있었다. 다음으로 실효성 검증을 위해 실시한 쾌적성과 환경오염의 상관분석 결과, 대기의 경우 SO2와 r=-0.649의 상관성을 가졌으며, 수질의 경우 TN, TP와 r=-0.643, -0.642의 높은 음(-)의 상관관계를 가지는 것으로 분석되었다. The purpose of this study is to assess the urban amenity on physical environmental factors, and to verify the effectiveness of the amenity map using correlation analysis of the environmental quality. The physical environmental factors were set to 4 items of green space, landscape, water environment and land use, and the items were composed of 11 detail factors. Based on the factors, GIS maps were constructed and the amenity map was produced using overlay analysis. The results of this study are as follow; the proportion of 1~2 ranks was 40.8% of total area around Dalseong-gun, Dong-gu, Suseong-gu. The lower 6~7 ranks in the amenity assessment was 5.7% of total area around Jung-gu, Seo-gu, Dalseo-gu. According to the results of correlation analysis between the amenity and environmental observed data, SO2 among the air pollution material had a negative correlation with amenity(r=-0.649, p<0.05). In case of water pollution, TN and TP had the negative correlations with amenity (r=-0.643, P<0.01; r=0.642, p<0.01).

김치유래 젖산균의 균체지방산 분석을 이용한 분류학적 연구

이정숙,정민철,김우식,이근철,김홍중,박찬선,이헌주,주윤정,이근종,안종석,박완,박용하,민태익 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.2

표준균주를 포함한 230여개의 김치유래 젖산균에 대한 균체지방산(FAMEs)을 분석하였다. FAMEs profiles는 Euclidian Distance 17.5에 의해 7개의 Major Cluster와 1개의 Single Cluster로 나뉘어졌다. 이중 A, B, C 및 Cluster는 Leuconostoc속으로 분석되어졌고, F는 Lactobacillus속으로 분석되어졌다. 그리고 E와 G cluster는 두개의 Genus가 혼재되어 나타났으며 보충적인 연구가 필요하다. 앞으로 김치유래 젖산균의 균체지방산 분석결과를 기반으로 한 데이타베이스에 95가지 탄소원을 이용하는 수치분류학적 접근방법 및 Pyrolysis Mass Spectrometry 등의 화학적 분석 방법과 분자친화적 연구를 통한 종합적 분류정보 체계가 갖추어지면 젖산균의 신속, 정확한 동정 및 연구에 활발히 이용되어질 것이다. Two hundreds and thirty lactic acid bacteria, mostly isolated from Kimchi, including type strains were sued for analysis of cellular fatty acids. The 230 test strains were recoverd in 7 major and 1 single clusters defined a Euclidian distance of 17.5. These aggregate taxa were equivalent to the genus Leuconostoc (aggregate group A, B, C and D), and the genera Leuconostoc and Lactobacillus (aggregate group G). It is concluded as evident that FAMEs (Fatty Acid Methyl Esters) profile of cell can be used as a criterion in classification of lactic acid bacterial from kimchi. Additional comparative taxonomic studies need to be carried out on well chosen representative strains to determine the most appropriate methods of value.

이동로봇의 동적 경로계획

이우송,오세봉,안용근,문정훈,한성현 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

This paper propose a new path planning method for mobile robots. The creation method of the course approaches with the method of the frame line graph base where the calculation time becomes disturbance. The graph composition where is not the static course plan method of existing, a course search and repeats continuously changes a graph and proposes the course the dynamic routing plan method. The method which is proposed is composed of a course creation phase and a course improvement phase, each phase includes a graph composition and a course search process.

急性 骨髓性 白血病 患者 1例에 對한 臨床報告

조정효,유화승,최우진,이용연,서상훈,이연월,손창규,조종관 대전대학교 한방병원 2000 惠和醫學 Vol.9 No.2

AML is the most common type of leukemia in adults. AML(acute myeloid leukaemia) is characterised by a rapid accumulation of abnormal white blood cells in the blood and bone marrow, resulting in severe anemia, and possibly infection, and hemorrhage during the course of the disease. In general the prognosis of patient with relapsed AML is poor. At this time, however, the only potentially curative therapy for relapsed patients is allogeneic BMT(bone marrow transplantation). This clinical study were carried out 1 case of female patient aged 44 with relapsed AML treated by herb medicine. At the time of admission, she complained of mild fever, nausea, vomitting, abdominal pain, anorexia and no sign of bleeding. For the 10 days of admission, she was treated with Oriental-Western medicine and all the symptoms were disappeared. After that, the syptoms were aggravated because of secondary infection. Anyway, above result showed the possibility of Oriental therapy as Supportive Care in AML.