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장현규,송국진,윤호주,K. C. Cheug,유태준 대한천식알레르기학회 1995 천식 및 알레르기 Vol.15 No.4
Backgrounds '. Since 1979, there have been numerous reports of latex IgE-mediated reactions reflecting a dramatic increase in incidence. Increased usage of latex gloves and changes in manufacturing methods have contributed to this rise in incidence of latex reactions. In addition to local irritation from direct contact, latex gloves have been associated with rhinitis, asthma, and anaphylactic reactions, especially perioperative reations. There are three high risk groups of IgE-mediated latex allergy(rubber industry workers, patients with spina bifida, snd health care workers), but patients who are not in any of these groups have been reported to have serious anaphylactic reactions including death. In these days many investigators have been trying to study the latex allergy, however there are no safe, and accurate diagnostic tools for latex allergy. So we have studied the extractable latex proteins in latex gloves and performed latex skin test for the hospital employees. Methods .' Latex glove extract was prepared with latex gloves of several brands made by different manufacturers. After that, the protein levels were checked for eight brands of latex gloves by Bio-Rad protein assay. To explore the protein contents, 15% SDS-poly- acrylamide gel electrophoresis was done for latex glove extract, and to compare the protein contents, 15% SDS-polyacrylamide gel electrophoresis was performed for latex and banana extract. Fuchsin-sulfite glycoprotein stain was done to know whether the lyophilized latex extract contain protein or glycoprotein. In order to investigate the incidence of latex IgE-mediated hypersensitivity, 35 hospital employees were interviewed and latex skin prick tests were performed. Of the 35 subjects, there were 15 operating room nurses, and 20 residents. Results 1) The extractable protein levels for the several brands of the latex gloves were variable in Bio-Rad protein assay. The protein levels in powdered gloves were a little higher than powder-free gloves. 2) SDS-polyacrylamide gel electrophoresis,' The three major protein bands of latex glove extract were found in less than 10kd, 14kd, 29kd. The protein bands for banana and latex glove extract were different each other. For Fuchsin-sulfite gly- coprotein stain, the result was negative. 3) Questionnaires for latex allergy and latex skin prick test; Symptoms associated with glove wearing were acknowledged by six volunteers(17% ) (4: contact dermatitis, 1: contact dermatitis and focal urticaria, 1: skin itching). Among six volunteers with symptoms associated with glove wearing, two subjects were a positive response for latex skin prick test. One had symptom of skin itching, the other had symptoms of contact dermatitis and focal urticaria. Condwion This results suggest that the protein levels of latex gloves from different manufacturers were variable, and the major bands of latex extract were found less than 10kd, 14kd, 29kd and the protein bands for banana and latex extract were different each other on the SDS -polyacrylamide gel electrophoresis. The questionnaires and latex skin prick test could be one of the diagnostic methods to detect latex allergy.
DUV와 열의 하이브리드 저온 용액공정에 의해 형성된 Al2O3 게이트 절연막 연구
장현규,김원근,오민석,권순형 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.4
The formation of inorganic thin films in low-temperature solution processes is necessary for a wide range of commercial applications of organic electronic devices. Aluminum oxide thin films can be utilized as barrier films that prevent the deterioration of an electronic device due to moisture and oxygen in the air. In addition, they can be used as the gate insulating layers of a thin film transistor. In this study, aluminum oxide thin film were formed using two methods simultaneously, a thermal process and the DUV process, and the properties of the thin films were compared. The result of converting aluminum nitrate hydrate to aluminum oxide through a hybrid process using a thermal treatment and DUV was confirmed by XPS measurements. A film-based a-IGZO TFT was fabricated using the formed inorganic thin film as a gate insulating film to confirm its properties. 저온에서 용액 공정을 통해 무기 박막을 형성하는 기술은 유기물을 사용하는 전자 장치 상용화에 활용도가 매우 높은 기술이다. 형성된 산화 알루미늄 무기 박막은 공기 중의 수분 및 산소를 막아 전자 장치의 열화를 방지하는 배리어 필름으로 사용될 수있다. 또한, 박막 트랜지스터의 게이트 절연막으로 사용될 수 있다. 본 연구에서, 산화 알루미늄 무기 박막 형성을 열공정과 DUV 공정의 두 가지 방법을 사용하여 동시에 수행되었으며, 박막의 특성을 각각 비교 하였다. 열처리와 DUV를 사용한 하이브리드 공정 통해 질산 알루미늄 수화물을 산화 알루미늄으로 변환한 결과를 XPS 측정으로 확인하고, 형성된 무기 박막을 게이트 절연막으로 사용하여 필름기판 기반의 a-IGZO TFT를 제작하여 특성을 확인하였다.
肥料問題에 관한 硏究 : 全羅北道를 中心으로 with emphasis on Jeonbug province
張鉉圭 전북대학교 농업과학기술연구소 1976 農大論文集 Vol.7 No.-
According to the change of economic structure in agricultual production, the relative importance of fertilizer has been gradually decreased(ie : the component ratio of fertilizer in rice production cost sohws 5∼6 %) . However, a considerable amount of fertilizer used are substantially increasing. In this situation, it was summarized as follow. 1. Total quantity of chemical fertilizer consumption in the period from 1965 to 1974 in Korea was doubled from 400 thousand ton to 800 thousand ton. but it is problem how much contributions to production have been and will be made by such an increase. 2. In the usage of chemical fertilizer large increasing trends are observerd in the use of nitrogen. 3. In future, especially, in the production of rice as a key staple crop, except N P K, special elements of fertilizer as silicic fertilizer, Ca, Mn, will be raised as an inportant problem. 4. In spite of the government's encouragement and the awareness of farmers about the effectiveness of manure, the increase in the use of self·supplied manure has not been satisfactory achived. That can be raised as an big problem. Thus, the serious problems in fertilizer are basically caused by the weakness of farm house hold economy, farm crpping system and other diverse factors. In which one of the evident problem is the relative low price policy of chemical fertilizer by the government fiscal support.
장현규,정동윤,권성규,조두형,박건식,Jong-Wong Lim 한국전자통신연구원 2021 ETRI Journal Vol.43 No.6
In this study, we present a venting clip for high‐power applications that is intended to reduce stray inductance. To reduce the stray inductance of packages in high‐power applications, the proposed venting clip features slots are inserted onto a conventional clip. A conventional clip and the proposed venting clip were designed and fabricated to compare the respective stray inductance. The inductance of the proposed venting clip was approximately 15.8% than that of the conventional clip at a frequency of 100 kHz. Through a comparison between the conventional and venting clips, it is confirmed that the proposed venting clip is superior for high‐power applications in terms of decreasing inductance. With reduced inductance, the switching‐loss for such applications is also expected to decrease. Moreover, the impedance of the venting clip decreased by approximately 15.5% compared with that of the conventional clip at a frequency of 100 kHz. The venting clip, which has reduced resistive component, is also expected to decrease conduction loss in high‐power applications.
장현규,원경숙,제갈양진,류대식 대한내과학회 2000 대한내과학회지 Vol.59 No.5
Behcet's disease is a nonspecific vasculitis characterized by exacerbations and remissions of unpredictictable duration. The commom clinical features in most patients are orogenital ulcers, uveitis and skin lesions-especially erythema nodosum-like lesions or positive pathergy test. Among the systemic manifestations of Behcet's disease, pulmonary involvement is very rare and only a few cases have been documented. The main event of pulmonary involvement is vasculitis forming multilocular aneurysms and thrombosis of the pulmonary artery. The commom pulmonary manifestations are hemoptysis, dyspnea, pleuritic chest pain, cough and fever. The prognosis of pulmonary vasculitis is very poor. A 30-year-old male patient with Behcet's disease presented with fever and dyspnea for 10 days. In the past years, his vision of the left eye was lost due to chorioretinitis. He took right hemicolectomy because of the perforation of colonic ulcer. Also he has been suffered from left hemiparesis due to multiple cerebral infarction. We describe a case with Behcet's disease with pulmonary infarction improved with prednisolone and cyclosporine.(Korean J Med 59:535-539, 2000)