반사형 디지털 홀로그래피 현미경 시스템에서의 조사면적 및 재생면적의 확대기록

최규환,김성규,조동현,윤선규,Choi, Kyu-Hwan,Kim, Sung-Kyu,Cho, D.,Yoon, Seon-Kyu 한국광학회 2006 한국광학회지 Vol.17 No.4

마이켈슨 간섭계 시스템에 두 개의 Convex Lens를 추가함으로서 평면파 참조광을 유지 시키며, 물체에 조사되는 물체광의 조사면적을 증대시킬 수 있는 변형된 마이켈슨 간섭계를 제작하였다. 변형된 마이켈슨 간섭계를 반사형 디지털 홀로그래피 현미경 시스템(Digital Holography Microscope System)에 적용한 결과 두 개의 Convex Lens를 추가하지 않은 고전 마이켈슨 간섭계를 사용한 디지털 홀로그래피 현미경 시스템 보다 넓은 영역에 대해 물체를 기록 할 수 있으며 또한 보다 넓은 영역을 재생 할 수가 있다. A modified Michelson interferometer type digital holography microscopy system is developed. There is a problem about recording and numerical reconstruction area at the microscopy application of Michelson type interferometer structure in the digital holography field. In this paper, to overcome this problem, we developed a new reflection type digital holography microscope system and increased recording and numerical reconstruction area of target object.

세줄콩들명나방 Omiodes indicatus (포충나방과)의 온도별 발육과 콩에서의 발생소장

최규환,홍윤기,장영직,문정섭,김치선,최동칠,김태흥,Choi, Kyu-Hwan,Hong, Yoon-Ki,Chang, Young-Jik,Moon, Jeong-Seop,Kim, Chi-Sun,Choi, Dong-Chil,Kim, Tae-Heung 한국응용곤충학회 2008 한국응용곤충학회지 Vol.47 No.4

The bean pyralid, Omiodes indicatus (Fabricius), moulted 4 times during larval period. When temperature increased from 15 to 20, 25, and $30^{\circ}C$, the developmental period of immature stages was shortened; 18.2, 7.5, 5.0, and 4.1 days of egg period; 51.8, 20.0, 12.7, and 9.9 days of larval period; 29.5, 12.0, 8.0, and 5.9 days of pupal period, respectively. Adult longevity was 16.0, 14.7, 11.2, and 7.5 days at respective temperatures. A female adult layed 57.0, 63.3, 82.2, and 31.7 eggs in 3.7, 6.0, 5.8, and 3.0 days of oviposition period at the same temperature regimes, respectively. Field survey in 2006 and 2007 showed that leaf damage on paddy field and upland soybeans began to appear in mid July, reaching its peaks in mid August and late September. Adults of the bean pyralid appeared in mid July and peaked in late August and early October. 세줄콩들명나방은 15, 20, 25 및 $30^{\circ}C$에서 온도가 높아질수록 미성숙단계의 발육기간은 짧아졌다. 즉 각 온도에서 알기간은 18.2, 7.5, 5.0 및 4.1일, 유충은 4회 탈피하며, 유충기간은 51.8, 20.0, 12.7 및 9.9일, 용기간은 29.5, 12.0, 8.0 및 5.9일이었다. 성충수명은 16.0, 14.7, 11.2 및 7.5일이었고, 3.7, 6.0, 5.8 및 3.0일의 산란기간 동안 암컷성충은 한 마리당 57.0, 63.3, 82.2 및 31.7개의 알을 산란하였다. 2006년과 2007년 논재배 콩과 밭재배 콩에서의 발생소장을 조사한 결과, 피해엽(권엽)은 모두 7월 중순부터 발견되기 시작하여 8월 중순과 9월 하순에 피해엽이 가장 많았고, 성충은 7월 중순에 발견되기 시작하여 8월 하순, 10월 상순에 발생 최성기를 보였다.

LED를 PLS 배열로 사용한 시역 형성 광학계가 없는 3차원 영상의 시역에 대한 연구

최규환,김성규,손정영,Choi, Kyu-Hwan,Kim, Sung-Kyu,Son, Jung-Young 한국광학회 2008 한국광학회지 Vol.19 No.2

본 연구는 2차원 PLS(Point Light Source) 배열과 디스플레이 장치의 조합을 통하여 시역형성용 광학판이 없는 3차원 영상을 재생하는 방법에 관한 것이다. PLS를 사용하여 3차원 영상을 디스플레이 하는 경우 기존의 시차장벽(parallax barrier), 렌티큘러(lenticular), 마이크로 렌즈(microlens lens) 등의 광학판을 사용할 때 발생하는 여러 가지 광학적 문제점 등을 해소할 수 있다. PLS로 사용된 LED 광원이 가져야 할 특성을 조사하였으며 PLS 배열을 통한 입체영상 디스플레이의 시역에 대해 실험을 통하여 입증 하였다. A two dimensional point light source array can replace both the viewing zone forming optics and the back light panel in the contact-type 3 dimensional imaging systems based on LC panels. This replacement can make the system structure of the 3 dimensional imaging systems no different from that of the conventional LCD and can reduce undesirable visual effects caused by the viewing zone forming optics. The problem with the point light source array is the visual quality deterioration of the system due to the non-ideal nature of the array.

하퇴부 보조테이핑이 족관절의 근기능에 미치는 효과

최규환,김현태,Choi, Kyu-Hwan,Kim, Hyun-Tae 대한물리치료학회 2001 대한물리치료학회지 Vol.13 No.2

The purpose of this study to compare the muscle performances (peak torque (PT), relative strength (RS), average power (AP), and total work (TW)) between taping group and non-taping group after 1 hour extensive exercise. Twenty healthy male subjects were evaluated in this study. Each subject was divided with taping(n=10) and non-taping group (n=10) randomly. Muscle performances were measured at 60 degree/sec and 180 degree/sec on the Cybex 770. The PT, RS, AP, and TW were measured before and after 1 hour extensive exercise. The results showed that taping group demonstrated significantly higher PT, RS, AP, and TW during ankle dorsiflexion and plantar flexion at 60 degree/sec than those of non-taping group, except for total work during ankle plantar flexion. At the 180 degree/sec, PT and RS was significantly higher during ankle dorsiflexion and plantar flexion in taping group than in non-taping group. This results suggest that lower leg taping could be useful to maintain muscle performances during sport activities.

햄스터 구강암 발생 과정에서 Heat Shock Protein에 관한 면역조직화학적 연구

최규환,이동근,Choi, Kyu-Hwan,Lee, Dong-Keun 대한악안면성형재건외과학회 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.4

Heat shock protein (HSP) expression is unregulated in tumor cells and, HSP expression is likely marker of the malignant potential of oral epithelial lesion. Furthermore, the 70kDa HSP is implicated in the degree of tumor differentiation, the rate of tumor proliferation and the magnitude of the anti-tumor immune response. Accordingly, the distribution and intensity of HSP 70 and HSP 47 expression was assessed in the DMBA induced oral carcinogenesis in hamster. Golden Syrian hamsters which were 3 months-age and 90-120g were collected. 9,10-dimethyl-1,2-benzanthracene (DMBA) in a 0.5% solution in mineral oil was painted on the buccal pouch mucosa 3 times per week in the study group. In each control and experimental groups of 6, 8, 10, 12, 14, 16, 18, 20 weeks, specimen were sectioned for immunohistochemical study with anti-HSP47 and anti-HSP70 antibody. The following results were obtained. 1. HSP47 positive cells were rare or negative of normal oral mucosa, increased mildly in basal and suprabasal basal layer, and spinous cell layer after experimental 6 weeks (dysplastic or CIS stage). In CIS stage, HSP47 expression is prominent in dysplastic free or normal adjacent epithelium. 2. HSP 47 positive cells in connective tissue were mainly inflammatory cells, which is gradually increased from control to precancerous and cancer stage. But HSP47 positive cells after 14 weeks were decreased, especially normal and cancer adjacent epithelium. 3. The positive staining cells of HSP70 in control, dysplastic, and CIS stage were not seen. But they were mild findings in basal layer and moderate findings in spinous layer after experimental 14 weeks (cancer stage). 4. HSP70 positive cells were increased in precancerous and cancer stage than control group in connective tissue. After experimental 16 weeks, we could not find the HSP expression in cancer cells according to cancer differentiation or cancer stage. It is concluded that HSP70 or HSP47 expression is not a definitive marker of oral malignancy or malignant potential. However, with further development, HSP immunoreactivity may be valuable as an adjunct to conventional histology for assessing the malignant potential of oral mucosal lesions.

교육가치 패러다임 및 LSI(Learning Styles Inventory)모델을 적용한 관광관련 대학생의 학습모형 개발에 관한 연구

최규환(Choi, Kyu-Hwan) 한국관광레저학회 2011 관광레저연구 Vol.23 No.5

연구논문 : 이자율스왑을 활용한 조세전략에 대한 연구

최규환 ( Kyu Hwan Choi ),문성훈 ( Seong Hoon Moon ) 한국회계학회 2013 회계저널 Vol.22 No.5

스왑은 장래의 일정기간 동안 현금흐름을 교환할 것을 약정하는 계약으로 현금흐름의 산정방법뿐만 아니라, 교환주기 및 계약의 만기까지도 계약 당사자들의 합의에 의해 다양하게 결정될 수 있다. 조세전략은 소득의 유형을 바꾸는 전략, 고세율의 납세자가 저세율의 납세자에게 소득을 이전하는 전략, 그리고, 소득의 귀속시기를 변경하는 전략으로 구분할 수 있다. 첫 번째 전략은 엔화스왑예금의 사례와 같이 실질과세원칙의 틀 안에서 거래의 법적·경제적인 실질에 따라 달성하고자 하는 조세전략의 성패가 달라질 것이고, 두 번째 전략은 이전가격과세 또는 부당행위계산부인 테두리 안에서 가능하다. 본 논문은 파생상품을 활용한 세 가지 조세전략 유형 중에서 상대적으로 과세당국과의 갈등을 유발할 가능성이 낮은 것으로 보이는 세 번째 유형의 세무계획에 초점을 두었다. A swap is a contract under which two parties agree to exchange cashflows in the future. The frequency of exchanges and maturity of a contract as well as the method for calculation of cashflows can be determined variably according to the agreement between interested parties. Tax planning can be divided into three type of planning activities which are converting income from one type to another, shifting income from one pocket to another, and, shifting income from one period to another, respectively. The success of the first type of planning would depend on the economic and legal substance of the transactions as demonstrated in the recent Supreme Court`s ruling in the Yen-swap deposit cases; and, the second type of planning would be substantiated to the extent that the transactions are carried out based on reasonable transfer pricing analysis etc.

통합적 관광지서비스 만족 모델에 관한 연구 -방한 중국인과 일본인 관광객을 대상으로-

최규환 ( Kyu Hwan Choi ) 관광경영학회 2014 관광경영연구 Vol.58 No.-

The purpose of this study is twofold; firstly, to identify whether there are the significant mean differences of aggregate destination service satisfaction(ADSS), overall destination satisfaction, revisit intention, and willingness to recommend between Chinese tourists and Japanese tourists in South Korea and; and secondly, to examine the casual relationships among ADSS, overall destination satisfaction, revisit intention, and willingness to recommend. The secondary data source used for this study were obtained from the 2012 International Visitor Survey conducted for Korea Tourism Organization(KTO). To confirm if research hypotheses are accepted, several empirical analyses were employed, including independent samples t-test, pearson correlation analysis, confirmatory factor analysis(CFA), and structural equation modeling(SEM). The findings of this study revealed that higher mean values were found in Chinese tourists than Japanese tourists in terms of the destination service attributes of immigration, transportation, accommodation, shopping, destination attractions, communication, travel expenditure, and overall destination satisfaction, while Japanese tourists were more satisfied with the service attribute of food than Chines tourists. In addition, significant causal relationships among the salient concepts were found in both Chinese tourists and Japanese tourists. These findings contribute to suggesting several theoretical and practical implications.

관광분야에 있어 학습과 진로를 연계한 진로준비행동 융합모델 개발 연구

최규환(Choi, Kyu-Hwan),여호근(Yeo, Ho-Keun) 한국관광레저학회 2018 관광레저연구 Vol.30 No.10

호텔종사원의 팔로워십을 도입한 직무만족도 평가연구

최규환(Choi Kyu-Hwan) 한국관광레저학회 2005 관광레저연구 Vol.17 No.3