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강태환,윤영국,이상조,Kang, T.-H.,Yoon, Y.-K.,Lee, S.-J. 한국음향학회 1989 韓國音響學會誌 Vol.8 No.1
본 연구에서는 음역의 변화를 위해 현재 사용중인 방법 대신 피아노 현에 집중질량을 달아, 피아노 현의 진동특성 및 음색에 관해 분석하였다. 이론적 해석은, 현의 질량을 등분화 하여 다자유도계의 스프링-질량 시스템으로 변환시켜 Holzer 방법으로 해석한 불연속계와, 모우드 합 방법과 라플라스 변환방법을 이용한 연속계로 해석하였으며 실험적 해석은 업라이트 피아노의 현에 집중질량을 부착시켜 수행하였다. This study made an analysis of the characteristics of vibration & tone color of the piano strings on which a concentrated mass was set to give variety of different variations to the gamut. Theoretical analyses in this study were based on discrete and continuous system, of which the former was transformed into a multi-degree of freedom system by dividing into a number of small parts, while the latter utilized mode summation and Laplace transformation methods. And experiments were carried out with setting concentrated masses on upright piano string.
논문 : 노외기계시스템공학 ; 멀티 스펙트럴 이미지 센서를 이용한 감자의 생육정보 예측
강태환 ( T. H. Kang ),野口伸 ( N. Noguchi ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.3
The objective of this research was to establish the estimation method of growth information on potato using Multi-Spectral Image Sensor (MSIS) and Global Positioning System (GPS). And growth estimation map for determining a prescription map over the entire field was generated. To determine the growth model, 10 ground-truth points of areas of 4 m2 each were selected and investigated. The growth information included stem number, crop height and SPAD value. In addition, images information involving the ground-truth points were also taken by an unmanned helicopter, and reflectance value of Green, Red, and NIR bands were calculated with image processing. Then, growth status of potato was modeled by multi-regression analysis using these reflectance value of Green, Red, and NIR. As a result, potato growth information could be detected by analyzing Green, Red, and NIR images. Stem number, crop height and SPAD value could be estimated with R2 values of 0.600, 0.657 and 0.747 respectively. The generated GIS map would describe variability of the potato growth in a whole field.
논문 : 생물생산시설 및 환경공학 ; 원적외선과 열풍 건조조건에 따른 오징어의 건조특성
강태환 ( T. H. Kang ),홍현기 ( H. K. Hong ),전홍영 ( H. Y. Jeon ),한충수 ( C. S. Han ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.2
Drying characteristics of squids under two dry conditions were investigated using far infrared and heated air. Dry temperatures of 40, 50 and 60℃ with air speed of 0.6, 0.8 and 1.2 m/s were used for evaluating far infrared squid drying. Heated air squid drying at 40 and 50℃ with air speed of 0.8 m/s was used as a control treatment. The two drying were evaluated in terms of drying rate, color, TBA value, aerobic bacteria, cutting shear, penetration strength, and energy consumption. The drying rate of far infrared drying was relatively faster than that of heated air drying. The drying time of far infrared drying was reduced as the drying temperature increased. The color difference of far infrared dried squids was from 18.81 to 22.85, and heated air dried squid had the color different from 23.94 to 24.09. Far infrared dried squid had relatively smaller TBA values that indicate a level of rancidity. The aerobic bacteria of heated air dried squid increased from 970×10(3) to 40,000×10(3) CFU/g before and after drying, respectively. Far infrared dried squid had relatively smaller increase (from 970×10(3) to 40,000×10(3) CFU/g). The cutting shear and penetration strength for far infrared dried squids was relatively lower. In addition, far infrared squid drying consumed relatively less energy compared to heated air drying.
제주산 우뭇가사리(Gelidium amansii )로부터 DMSO 추출과 EDTA 수세법에 의한 상용화 아가로스 제조
강태환 ( Tai Hwan Kang ),이승홍 ( Seung Hong Lee ),백종석 ( Jong Seok Baik ),강병식 ( Byung Sik Kang ),이정석 ( Jung Suck Lee ),이남호 ( Nam Ho Lee ),전유진 ( You Jin Jeon ) 한국수산과학회(구 한국수산학회) 2011 한국수산과학회지 Vol.44 No.6
Agar was prepared from Gelidium amansii collected from Jeju Island, South Korea. This agar preparation has high gel strength and low sulfate content compared with G. amansii agar from Morocco. Accordingly, agarose was made from the Jeju agar through the consecutive refining processes of dimethyl sulfoxide (DMSO) extraction and ethylene diamine tetra acetic acid (EDTA) washing. The physicochemical properties of the resulting agarose were compared with those from agarose prepared using only DMSO extraction. Consecutive DMSO extraction and EDTA washing more strongly affected the physicochemical properties of the agarose (purified agarose) compared with the use of DMSO extraction alone. These properties were similar to those of commercial agarose used for electrophoresis. In DNA electrophoresis, the separation and movement speed of the purified agarose were similar to those of the commercial agarose. In a 13C NMR analysis, the purified agarose exhibited the same carbon peak as the commercial agarose. When observed under scanning electron microscopy, the agar had an even and smooth surface without irregularities or pores, and the purified agarose had a wide surface area with a large number of pores; the commercial agarose had an irregular surface that would allow the solvent to easily permeate. These results illustrate that the physicochemical properties of agarose prepared from DMSO extraction and EDTA washing were more effective than those observed after DMSO extraction alone; thus, these processes used in succession will be useful in agarose industries.