창공91의 비행 시험을 통한 지면 효과 측정에 관한 연구

황명신,장욱진,이정훈 한국 항공대학교 항공산업기술연구소 1996 航空宇宙産業技術硏究所 硏究誌 Vol.6 No.-

창공-91 비행기를 이용하여 비교적 양항비가 큰 비행기의 지면 효과를 측정하는 연구를 수행하였다. 이착륙 중에는 지면에 의한 영향에 의해 공기역학적인 특성이 변화하며, 따라서 조종 특성에 많은 영향을 준다. 지면 효과에 대한 연구는 특히 시뮬레이터를 설계하는데 기초적인 자료로서 대단히 중요하지만 측정의 어려움 등으로 인하여 거의 연구 자료가 없다. 본 연구에서는 경비행기인 창공-91을 이용하여 여러 가지 비행 형태에 대해 지면 효과를 측정하기 위한 비행 시험을 수행하였다. 비행 형태는 실제 이착륙 조건을 고려하여 플랩 1단, 2단, 3단에 대하여 수행되었으며, 본 연구에서는 적은 비행회수로도 지면 효과를 측정할 수 있는 일정 받음각 방법을 이용하여 비행을 하였다. 실제 비행 시험 결과 지면 가까이에서 양력의 증가를 확인할 수 있었지만 항력과 키놀이 모멘트의 변화를 측정하기는 어려웠다. When an airplane flies close to the ground, at a height of one or two wing spans, it experiences an increase in lift and significant changes in drag and pitching moment. This phenomenon is known as ground effect. A study on the Ground Effect of Chang-Gong 91 was conducted by the flight test. Because of the obvious influence of ground proximity during the takeoff and landing phases, it has been the subject of considerable investigation, especially for simulator design. However, despite this consideration, an adequate amount of reliable ground-effects data does not appear in the literature. A Constant Angle of Attack approach technique was used to measure ground effect on several aircraft configuration. Test results indicate that ground proximity produces and increase in the lift-curve slope for Chang-Gong 91

구강내 악성흑색종에 대한 임상연구

김욱규,허진호,황대석,김용덕,신상훈,김종렬,정인교 부산대학교 병원 암연구소 2008 부산대병원학술지 Vol.- No.23

The prognosis of oral malignant melanoma is poor compared with cutaneous melanoma. It may be related to the difficulty of wide enough resection, the early hematogenous matastases, higher stage at initial diagnosis, tendency to growth vertically. In the view of histological differences between oral mucosa and skin, it is impossible use Clark’s and Breslow’s classifications for prognosis. The great problem is that there is still no consensus on the treatment due to rarity. Because data collection from case reports is considered to be the best source of information and should be pooled to anlalyze key determinants of outcome, We reported on 6 cases of primary malignant melanoma of the oral cavity which were diagnosed and treated in Pusan National University Hospital recently and reviewed the literature. Immunohistochemical study on S100 Protein, GP 100 (HMB-45) with biopsy was usable to confirm the melanoma. Neck dissection including wide excision is recommended if lymph node involvement is suspected. Additionally, adjuvant chemotherapy could be supporting therapy.

응급실 내원시 예상치 못한 사망 환자의 예측 인자

김욱진,서정필,정성필,황태식,이한식 대한응급의학회 1998 대한응급의학회지 Vol.9 No.4

Background: Unexpected deaths of the patients at ED are surprising to the medical staffs as well as the families. It may also increase the possibilities of medico-legal problems. This study was conducted to review the unexpected death in ED and find the predictive factors leading patients to unexpected death. Methods: A retrospective study with reviewing available medical records of 183 patients who were expired at Ed of Shinchon Severance Hospital from Mar. 1997 to Feb. 1998 and 103 patients of Youngdong Severance Hospital from Mar. 1996 to Feb. 1998 was done. Analyses were done on 30 variables of physical findings, laboratory results, procedures and therapies. We used univariate analysis such as t-test and x²-test and multiple logistic regression analysis. Results: Of the total 286 deaths in Ed, 153 cases were enrolled in this analysis. The number of unexpected deaths were 76. Age, mental status, fraction of neutrophil count, BUN level, whether endotracheal intubation was done, use of inotropics were the factors with statistical significance on the univariate analysis, but only comatose mentality, endotracheal intubated case, and use of the inotropics were significant on logistic regression analysis. The longer the ED length of stay, the higher the rate of mortality and unexpected death. Conclusion: This result suggest that medical attention is needed on the patients with comatose decreased mental status, endotracheally intubated case and needing inotropic agents to prevent unexpected deaths shortening the ED length of stay may also be a factor for decrease the unexpected death rate.

생물학적 수소생산의 연구동향

김진욱,황재웅,김진욱,이재화 신라대학교 자연과학연구소 2005 自然科學論文集 Vol.14 No.-

미국, 일본, 유럽 등은 수소에너지를 이용한자동차를 개발하였고 상용화시킬 계획까지 세우고 있다. 그리고 이미 수소충전소를 설치하였고 설치 계획 중인 나라들고 증가하는 추세이다 수소는 태양광, 석탄, LPG 등을 이용하여 생산하는 2차 에너지이다. 그 중 폐수의 슬러지를 이용하여 혐기성 발효시켜 수소를 발생시키는 방법이 1차 에너지를 이용하는 것보다 생산비가 절감된다. 혐기성 발효공정에는'가수분해 단계', '아세트산 생성단계', '메탄생성 단계' 로 나뉜다. 수소 생산 균의 pH, 온도, 체류시간에 따라 활성이 틀리고, 그 효율을 높이기 위한 다양한 방법들이 연구 되었다. The United States and Japan, the Europe back the commercial business anger to develop the automobile which uses a hydro energy until the plan which it will make it is building. And the country which is in the process of establishment planning already hydrogen charging smallness to establish it holds and it is a tendency which increases. The hydrogen uses the solar storehouse, the coal and the LPG back and it is a 2nd energy which it produces. It uses the sludge of the waste water in that and anaerobe it takes effect and the method which occurs the hydrogen is reduced 1st using an energy compared to the cost of production. To anaerobic taking effect process singer disjointing phase, acetic acid creation phase, it causes to defecate with the methane creation phased. The pH and temperature of the hydrogen production germ, it followed at stay hour and the activity was incorrect, it raised the efficiency and the methods which are various for were researched.

PCA(Principal Components Analysis)를 이용한 지폐의 정사 분류

이준재,양황규,이재욱 東西大學校 1997 동서논문집 Vol.3 No.1

In this paper, an efficient classification algorithm using principal components analysis for enhancing the performance of the currently used bank note classification system is proposed. This method first transforms four feature vectors from sensing devices into principal components analysis, then maps the feature vectors to eigenvectors corresponding to maxium among eigenvalues. A cash is classified as new if it is greater than the threshold set by user, as old if it is not. The experimental result shows that the proposed system enhance the performance of the current system above 1%.

선천성 완전방실차단이 동반된 신생아 루프스 1예

정재현,이은지,이은주,황진원,송영진,최병진,김일환,김종윤,허민영,김동욱 인제대학교 2009 仁濟醫學 Vol.30 No.-

Neonatal lupus is a rare syndrome occurring In neonates with tranplacentally acquired maternal autoantibodies, In particular anti-SSA/Ro-SSB/Ra antibodies. Manifestations include congenital heart block, cutaneous lesions, thrombocytopenia, neutropenia, pulmonary or neurological disease and hepatitis. The non-cardiac manifestations resolve by 6 months of age, congenital heart block is irreversible. We experienced a case of neonatal lupus with congenital complete heart block in a newborn of asyptomatic mother with anti-SSA/Ro-SSB/Ra antibodies.

A Study on the Endogenous Process of Implementing International Environmental Standards: Special Interest Politics Approach

Uk Hwang,Seok Joon Hwang,Mi Jin Kim,Jang Yul Cho 한국환경정책평가연구원 2006 기본연구보고서 Vol.2006 No.-

열팽창캡슐 적용 발포폴리프로필렌의 물리적 특성 비교

하진욱(Jin Uk Ha),정선경(Sun Kyung Jeoung),이평찬(Pyoung-Chan Lee),황예진(Ye Jin Hwang),남병국(Byung Kook Nam),한인수(In-Soo Han),곽성복(Sung Bok Kwak),이재용(Jae Yong Lee) 한국고분자학회 2015 폴리머 Vol.39 No.1

열팽창 캡슐은 코어에 위치한 발포가스가 기화온도 이상이 될 경우 캡슐을 팽창시켜 상온상태보다 큰 부피를 지닌 형태를 이루게 되는데 이러한 특성을 이용하여 플라스틱의 발포소재로 적용이 가능하다. 본 연구에서는 자동차 내외장재 용도로 가장 많이 사용되는 폴리프로필렌(polypropylene, PP)을 베이스 원료로 하여 기존 화학발포제와 열팽창 캡슐을 이용하여 PP 폼을 제조하였으며, 제조된 시편의 물리적인 특성을 비교하였다. 화학 발포제와 열팽창 캡슐을 적용하여 제조된 PP 폼은 모두 첨가된 발포제 및 열팽창 캡슐 함량 증가에 따라 시편의 밀도가 감소하였고, 인장강도를 포함한 기계적 물성 또한 감소하였다. 하지만, 열팽창 캡슐을 이용해 제조된 PP 폼의 경우는 화학 발포제를 적용하여 만들어진 시편대비 충격강도 감소량이 크지 않았다. 발포제 종류별로 상이한 물리적 특성을 분석하기 위하여 PP 폼의 매트릭스를 분석하였으며, 다른 형상의 모폴로지를 관찰하였다. Thermally expandable microcapsules (TEMs) can be expanded upon heating since the activation energy of liquid hydrocarbon at the core of the TEMs increased at high temperature. Due to this property, TEMs are widely used in the industry as blowing agents or light-weight fillers. In this article, chemical blowing agent and TEM were used for making polypropylene (PP) foams, and their mechanical properties were compared. Physical properties (tensile strength, impact strength etc.) of PP foams decreased with increasing the amount of blowing agents while weight of specimen decreased. However, PP foam produced with TEMs showed higher impact strength than the one with a chemical blowing agent. In order to figure out the difference of impact strength, the morphology of PP foamed was investigated. Expanding properties of TEM can be controlled by changing core back distance.

The Effect of Antifouling Modified PMMA for Automotive Rear Reflector

Ye Jin Hwang,Hyun Wook Lee,Myong Sik Ahn,Do Ho Lee,Jin Uk Ha 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.2

사출스킨 신공법 적용 크래쉬패드의 감성 연구

하진욱(Jin-Uk Ha),정선경(Sun-Kyoung Jeoung),이평찬(Pyoung-Chan Lee),김보람(Bo-Ram Kim),황예진(Ye-Jin Hwang),곽성복(Sungbok Kwak),이재용(Jaeyoung Lee),김범호(Beom-Ho Kim),권오민(O-Min Kwon) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5