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

후경골근 건파열에 의한 후천성 편평족 -2례보고-

김태욱,황지혜 大韓再活醫學會 1997 Annals of Rehabilitation Medicine Vol.21 No.5

단감의 이용성 증대를 위한 protopectinase처리 가공기술 개발

하정욱,이대희,김기운,황용일 慶南大學校 附設 基礎科學硏究所 2002 硏究論文集 Vol.16 No.-

가공식품의 개발에 있어서 식품의 맛과 더불어 저장성, 열 안정성 및 색조유지는 소비자의 기호도에 중요한 영향을 미친다. B. subtilis EK11 유래의 protopectinase(PPase)는 식물조직 중엽부의 주성분인 불용성 protopectin을 분해하여 단세포화하는 효소이다. PPase를 단감에 작용시켜 단감 고유의 세포 속에 함유되어 있는 세포내 성분들의 파손 없이 단세포를 유리하였다. PPase처리된 단감 단세포화물의 착즙 후 회수율과 잔사율은 각각 95%와 5%로서, 기계적 마쇄물에서의 85%와 15%에 비하여 높은 회수율과 낮은 잔사율을 나타내었다. 총당, 환원당, 자당, 조단백질, 조지방 및 조섬유의 함량변화는 큰 차이가 없었으며, 이는 단세포 처리에 의하여 이들 성분이 안정하게 유지됨을 알 수 있었다. 식품중 열 또는 빛에 가장 불안정한 비타민 C의 경우 단감 단세포화물은 1일 경과 후에도 50% 이상이 보존되는 것으로 보아 단세포에 의한 일반적인 구성성분이 안정하게 유지 보호됨을 알 수 있다. PPase로 처리된 단감 단세포화물을 4℃에서 9일간 저장하며 색조를 관찰한 결과, 단세포화물에서는 뚜렷한 색조의 차이가 없었고 기계적 마쇄물에서는 변색이 일어났다. 또한 단감 단세포화물을 100℃에서 60분간 열처리한 후 관찰한 결과, 기계적 마쇄물의 경우 짧은 처리에도 변화를 보였으나 단세포화물에서는 그다지 큰 변화가 없었으며 이는 효소적 단세포화물의 높은 열 안정성을 의미한다. PPase를 이용한 단감의 단세포화는 음료제조 및 원료보존에 유용하게 응용가능하며, 나아가 단감 단세포화물의 폭넓은 식품소재화 가능성과 고부가가치 기능성 식품제조에 이용될 수 있음을 의미한다. In development of the processed food, it is important not only to make the food delicious but to enhance its storage span and thermal stability without change of the food quality in color, which greatly affects the tastes of customers. Protopectinase (PPase) from Bacillus subtilis EK11 hydrolyses or dissolves protopectin in the middle lamella of plant tissues with the resultant separation of plant cells from each other, called enzymatic maceration. With the PPase, persimmon was enzymatically macerated to separate cells to primary cell wall without damage. Yields of persimmon treated with PPase and mechanical maceration were 95% and 85%, respectively. Total and reducing sugars, crude protein and fat in the enzymatic maceration were well preserved as in the mechanical maceration. Importantly, over 50% of vitamin C, which is the most unstable component in application of the mechanical maceration, remained with intact form for one day after the enzymatic treatment. When the suspensions of persimmon macerated with both treatments had been stored at 4℃ for 9 days, the suspension of mechanically macerated persimmon was decolorized. Whereas decolorization was not found in the enzymatically macerated persimmon. Moreover, the mechanically macerated persimmon was greatly deteriorated after heat treatment at 100℃ for 60 min; the cell suspension of the enzymatically separated persimmon appeared to be stable, indicating the thermal stability. Thus, the PPase treatment of persimmon could be a better choice for preparation of the highly valuable and functional processed food as well as for prolonging the preservation period.

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.

구강내 결손부에 적용된 연조직 재건술식들에 대한 임상적 고찰

김욱규,이승환,황대석,김용덕,신상훈,김종렬,정인교 부산대학교 병원 암연구소 2007 부산대병원학술지 Vol.- No.21

To evaluate criteria, indications, and prognosis of the various reconstructive methods on the patients with intraoral soft tissue defect who had been treated at Dept. of Oral and Maxillofacial Surgery, Pusan National University Hospital from 2003 to 2005, we have reviewed the clinical data of the patients and analysed. The results were as follows: 1. Tongue flaps have been mainly applied on anterior portion of palate and maxilla. The survival rate was high percent, but the cooperation of patient was inevitable for the success. 2. Palatal mucosa rotational flaps were available on relative large defect on palate, oroantral fistula site. The side effect was a scaring band from secondary healing on denuded donor palate site. Sometimes the band came to be a hinderance to swallowing, phonation. 3. The application of free skin graft on entire maxilla site , palate was possible. The skin from thigh, abdomen could be applicable on fixed or movable tissues. The advantages of abdominal skin were easy harvest and direct donor site closure. 4. Forearm free flap was a workhorse flap for everywhere in intraoral defects. We had used the flap on cheek, floor of mouth, tongue without any significant complications. But the application of the flap was required for long operation time, which was disadvantageous to the old, weak patients. 5. Cervical platysmal flap could be easily applicable for buccal cheek, floor of mouth after excision of the cancer lesion. the design of the flap could be made simultaneously on neck dissection, but the danger of cancer remnants on the flap always might be remained. 6. Buccal fat pad pedicled flap must have been a primary flap for repair of oroantral fistula especially on posterior maxilla. The flap survival will be expected if the considerations for above reconstructivε methods on site, size, condition of defects primarily could be made.

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.

악안면 영역에서의 유리 전완피판술 적용례분석

김욱규,송원욱,황대석,김용덕,신상훈,김종렬,정인교 부산대학교 병원 암연구소 2009 부산대병원학술지 Vol.- No.25

초기 성공적인 심폐소생술후 혈청 Interleukin-6 농도의 발현양상

박규남,박승현,황두영,김형국,이환,최경호,이원재,정욱성,김학주,김세경 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.4

Objective : To investgate patterns of serial serum interleukin-6(IL-6) concentrations after initial successful cardiopulmonary resuscitation, and to access differences in serum IL-6 concentrations in patients with Cerebral Performance Category(CPC, 1-2) and CPC(3-5) at the 5th day after cardiacpulmonary resuscitation(CPR). Methods : We studied prospectively 12 patients with spontaneous circulation after cardiopulmonary resuscitation. Venous blood samples were taken 2, 4, 12, 24, 48 and 72 hours after restoration of spontaneous circulation to measure serum IL-6 levels by the enzyme-linked immunosorbent assay. Results : Serum IL-6 concentrations in the severe neurolgically disabled group(CPC, 3-5) were significantly increased at 2, 24 and 48 hours after restoration of spontaneous circulation compared with the less neurolgically disabled group. Also, serum IL-6 concentrations in the severe neurolgic disabled group showed dual peak at 4 and 24 hours. Conclusion : Our study demonstrates significant increase of serum IL-6 in patients with CPC(3-5) after successful cardiopulmonary resuscitation and the significant correlation between early increase of serum IL-6 and poor neurologic outcome. It suggests that early increase of serum IL-6 can be used as a prognostic marker after successful cardiopulmonary resuscitation.

호두 기름의 성분조성과 항알레르기 효과

서영호,김욱희,김경만,황태영,손현숙 동아시아식생활학회 2001 동아시아식생활학회지 Vol.11 No.3

This study was conducted to investigate physicochemical properties and anti-allergic properties of walnut oil, pH, acid value and iodine value of walnut oil were respectively 4.9, 0.8 and 117. Most of general composition of walnut oil was crude fat(99.9%). Vitamin A and E were 0.06 and 10.25㎎/100g and the major fatty acids of walnut oil was linoleic acid(62.8%). Total phenolics and antiallergic effects of walnut oil were estimated 27㎎% and 62.82% at the concentration of 0.5% ethanol walnut oil. These results suggest that the walnut oil can provide one of the valuable resource for the functional foods.

하악과두에 발생하는 골연골종의 진단학적 방법

신상훈,차승만,황대석,김용덕,김욱규 부산대학교 병원 암연구소 2006 부산대병원학술지 Vol.- No.20

Pulpose : Osteeochondroma is a common benign tumor of the axial skeleton, especially the distal metaphysis of the femur and the proximal metaphysis of the tibia, however, is\ occured rarely on the facial skeleton. Tumors of the mandibular condyle are various and rare. so common interest is a little and its clinical symptoms are similar to the others. therefore, early diagnosis is very difficult. In this study, we will present our cases and review the literatures. Patients and Methods: We studied 17 patients(8 males, 9 females) who were diagnosed a osteochondroma of the mandibular condyle in the department of oral and maxillofacial surgery, Pusan National University Hospital. We reviewed the medical records. Results : Patients' mean age was 30.05 years. The sexual distribution is almost same. Twelve left condyles and five right condyles were involeved. The main symptoms was noise and facial asymmetry. Conclusion : Osteeochondroma is a rare benign tumor of the mandibular condyle. The differential diagnosis is difficult. However, using CT and MRI, we diagnosed early the osteochondroma and treated properly. Thus, we presented the cases of the osteochondroma with the literature reviews.