Quadratic Residue Diffusor Microwave를 이용한 목재의 내부 온도변화에 관한 연구

김기호,김경민,Kim, Ki-Ho,Kim, Kyung-Min 경북대학교 농업과학기술연구소 2014 慶北大農學誌 Vol.32 No.1

본 연구에서 사용한 QRD(Quadratic Residue Diffusor) 마이크로파는 일반적인 마이크로파와 달리 파장의 위상차를 변화시켜 균일한 살균을 유도할 수 있어 저전력으로 효과를 높일수 있는 새로운 기술로 알려져 있다. 따라서 친환경적이고 에너지 소비가 적은 QRD 마이크로파를 이용하여 목재를 소독 할 가능성에 대한 기초적인 연구를 수행하였으며 얻은 결과는 아래와 같다. 본 연구에 사용된 QRD microwave의 효율성은 E=5.75e0.32S ($R^2$=0.908)로 나타났으며 초기 수분 함수율은 일정하지 않았고 평균 수분함수율은 30.3%이었다. 자연건조 1주일 후의 수분 함수율은 22.6%로써 평균 약 8% 수분함량이 줄어들었다. 또한 마그네트론의 용량이 3 kW에서 9 kW까지 증가할수록 지수함수적인 관계로 온도 상승시간이 줄어드는 것을 알 수 있었다. 목재 강도 시험 결과에서는 QRD microwave 처리 전후로 휨강도, 압축강도, 할렬의 차이는 없었다. 따라서 QRD microwave 용량을 3, 5, 7, 9 kW로 제작하여 실험한 결과 9 kW가 가장 효율성이 높은 것을 알 수 있었다. 따라서 목재 내부의 선충이나 흰개미 등의 퇴치를 위해서 QRD microwave 용량을 일정부분까지 높여 공급할수록 에너지 효율성에서 유리한 것으로 나타났다. In contrast to conventional microwaves, QRD (Quadratic Residue Diffusor) microwaves are a new energy-efficient technology that enhances the effect of sterilization based on changing the wavelength phase difference. Therefore, this study investigated the sterilization of wood using environmentally friendly and low energy consuming QRD microwaves. The results are as follows: for the QRD microwaves used in this study, the efficiency E = 5.75e0.32 S ($R^2$=0.908). Although the early water content was not constant, the average water content was 30.3% and after one week of natural drying, the water content was 22.6%, representing an average water content reduction of about 8%. When increasing the microwave level from 3 kW ~ 9 kW, the time taken for the temperature to increase was reduced. After the QRD microwave treatment, the wood samples showed no change in their flexural rigidity, compressive strength, or cleavage. The QRD microwave levels used in the experiments were 3, 5, 7, and 9 kW, where 9 kW was found to be the most efficient. Thus, for the purpose of eliminating nematodes and termites inside wood, a higher QRD microwave level was found to be more effective and energy efficient.

생활과학-암의 세계

김기호,Kim, Gi-Ho 한국과학기술단체총연합회 1981 과학과 기술 Vol.14 No.6

글로우 방전을 이용한 고효율 공기 정화용 화학 반응기의 특성관찰에 관한 연구

김기호,부민호,이상천,Kim, Gi-Ho,Bu, Min-Ho,Lee, Sang-Cheon 대한화학회 2006 대한화학회지 Vol.50 No.1

방전을 이용한 화학반응기의 기본 모델은 관통형 속 빈 음극 방전셀을 응용하였다. 최근 글로우 방전은 원자분광학에 있어서 방출원으로서의 역할과 더불어 원자화 장치로서 점차적으로 그 연구의 범위를 넓혀가고 있으며, 미량분석, 철강분석, 표면 분석 등에 널리 사용되고 있으며 타 분석 기기와의 접목 등을 통하여 상당한 기술적 성과가 이루어지고 있다.1 또한 본 연구 이전에 기초적인 글로우방전의 성질과 방출 특성에 대해서도 여러 차례 재검토된 바 있어 본 실험에 활용할 수 있었다.2-3 지난 1993년에는 저온의 플라즈마를 이용하여 대기중의 유독가스의 처리에 대한 연구가 발표되었으며, 이 논문에 의하면 연속적인 공기의 흐름 하에서 직류 글로우 방전을 이용하면 유해성 가스인 SO2와 NO의 제거가 가능하다고 보고되었다.4 이를 바탕으로 본 연구에서는 안정적인 공기 플라즈마의 형성과 관통형 양, 음극관 안으로 모든 흐름공기가 음 글로우(Negative glow)영역을 통과하도록 고효율 반응기를 설계하였다. 현재 본 연구에서 디자인한 속 빈 음극관 형 글로우 방전은 경제성이 우수하며 사용하기 쉽다는 것 외에도 방출원 으로서의 장점도 제공함을 관찰하였다. the basic model of chemical reactor using glow discharge, we used cathode discharge cell with vacant cavity in the middle. Currently glow discharge is widely studied as a radiation source or atomization device in atomic spectroscopy and remarkable technological achievements are made through the graft with other analysis devices such as microanalysis and steel analysis.1 Additionally, as the characteristics of basic glow discharge and radiation have been reviewed many times, those results could be used in this experiment.2-3 In 1993, an article regarding the treatment of poisonous gas in the air using low temperature plasma was published. According to this article, if DC Glow Discharge is used under continuous atmospheric flow, poisonous gases such as SO2 and NO can be removed.4 Based on those findings, we designed highly efficient reactor where stable air plasma is composed and all air flow pass the negative glow area passing through the tube. It was observed that the cathode tube type glow discharge developed in this study would be economical, easy to use and could be used as radiation source as well.

대구광역시 녹색뉴딜사업 현황과 비전

김기호,Kim, Gi-Ho 대전발전연구원 2009 대전발전포럼 Vol.29 No.-

염욕을 이용한 액상금속반응에 의한 Mg-Sb , Mg-Bi , Al-Sb 계 금속간화합물의 제조

김기호,윤우영 ( Ki Ho Kim,Woo Young Yoon ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.2

N/A The syntheses of intermetallic compounds through liquids reactions between two components are studied. Two different behavious to form the intermetallic compounds in the reaction are observed. One is a catastropic reaction which leads to a-rapid formation of intermetallic compounds and the other is a non-catastropic reaction which results to slow formation. The Mg-Bi and Mg-Sb system were selected to monitor the catastropic reaction and the Al-Sb system was chosen for the non-catastropic reaction. The reason of the reaction speed was rationalized by the heat evolution and the mixing enthalpies. Temperature for the Mg-Bi and Mg-Sb system was raised by about 250∼350℃ during intermetallic formations and the interface layer between the two liquids was planar and thick. But in the case of the Al-Sb system, temperature rise was only 4∼5℃ and many perforate and thin interfaces were observed. A new method to synthesize and separate the intermetallic compounds from the reacted liquids has also been developed. It is separated by density differences in a salt bath. The new method has been proved to attain the intermetallics without contamination from the base metals and can be applied not only to the Mg-Bi and Mg-Sb system which are catastropic reaction systems, but also the Al-Sb system which has slow reaction kinetics.

한국인에서 다발성 내분비선종 증후군의 초기 증상 및 임상 양상

김기호,구민영,허성모,이세경,최준호,이정언,김지수,정재훈<SUP>1<.SUP>,남석진,양정현,김정한,Ki-Ho Kim,M.D.,Min-Young Koo,M.D.,Sung-Mo Hur,M.D.,Se-Kyung Lee,M.D.,Jun-Ho Choe,M.D.,Jeong Eon Lee,M.D.,Jee Soo Kim,M.D.,Jae-Hoon Chung,M.D.<SU 대한갑상선-내분비외과학회 2010 The Koreran journal of Endocrine Surgery Vol.10 No.4

Purpose: Multiple endocrine neoplasia (MEN) syndrome is an inherited, autosomal dominant disease that presents as a combination of several endocrine tumors. Early diagnosis of this syndrome is difficult, because of the nonspecific symptoms and signs. This study analyzed early manifestations and clinical characteristics in patients with MEN syndrome. Methods: Medical records were retrospectively reviewed and telephone interviews were conducted with 35 patients diagnosed as MEN syndrome at Samsung Medical Center from December 1994 to December 2009. Results: The 35 patients had been diagnosed as MEN1 (n=14), MEN2A (n=19) and MEN2B (n=2). The early manifestations of the 14 MEN1 patients were related with hyperparathyroidism (n=5), pituitary tumor (n=3), and pancreatic endocrine tumor (n=2). There were tumors of the parathyroid gland in all 14 patients, anterior pituitary in eight patients, and pancreatic islet cells in seven patients. Four cases were incidentally detected during the screening examination. Six cases harbored a MEN1 gene mutation. The twenty-one patients diagnosed with MEN2 comprised medullary thyroid cancer (n=20), adrenal pheochromocytoma (n=15), and hyperparathyroidism (n=4). The MTC-related symptoms in the 21 MEN2 patients included neck mass or discomfort in 12 patients and pheochromocytoma-related symptoms in seven patients. Two cases were detected through familial genetic screening test. The RET gene mutationwas detected in 19 cases. Conclusion: Early manifestations of MEN syndrome were very different between the types of MEN and the types of its presenting tumor. The early diagnosis and proper management of MEN requires awareness of the clinical characteristics of each expressed tumor and is influenced by genetic screening methods. (Korean J Endocrine Surg 2010; 10:266-275)

유사석유제품 근절을 위한 제언

김기호,Kim, Gi-Ho 대한석유협회 2006 석유와 에너지 Vol.2006 No.3

유럽에 번져간 한국간호원들

김기호,Kim Ki Ho 대한간호협회 1966 대한간호 Vol.5 No.6

수종약제에 의한 피부조직배양에서의 극세포해리의 유발

김기호,은희철 ( Ki Ho Kim,Hee Chul Eun ) 대한피부과학회 1990 대한피부과학회지 Vol.28 No.5

노사분규를 발전의 계기로

김기호,Kim, Gi-Ho 한국레미콘공업협회 1987 레미콘 Vol.9 No.-