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Low Speed Control of Induction Machines with inertia identification
Nam-Joo Kim,Hee-Sung Moon,Dong-Myung Lee,Dong-Seok Hyun 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
This paper presents a control method of induction machine in a low speed range with the instantaneous speed observer and inertia identification. When the low resolution incremental-type encoder is used for the speed detection, we get only the average speed between the interval of the encoder pulses and it makes usually speed controller unstable at the very low speed range. This paper, therefore, proposes a low speed control method using the low precision shaft encoder with speed observer implementing the disturbance torque observer. Furthermore, to improve the performance of the speed controller, we will perform the inertia iden tification algorithm using th e estimated inertia acquired by the periodic test signal. We will show that this proposed method is superior to the conventional method by simulation and experimental results.
Study on macrolepidoptera diversity using light trap catches in Korea, 2012
Sung-Jae Jeon,Youngwoo Nam,Sang-Hyun Koh,Won il Choi 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
The species diversity of macrolepidoptera (larger species of moths) was surveyed using light traps at forests near the Forest Environmental Research Institute located in 9 provinces (Gyeonggi, Gangwon, Chungbuk, Chungnam, Jeonbuk, Jeonnam, Kyeongbuk, Kyeongnam, Jeju) in 2012. Sampling was conducted weekly or biweekly from April to October. Using light traps in 8 forests, 2,961 individuals belong to 530 species from 20 families were collected. The species richness between study sites ranged from 4 (Kyeongnam) to 258 (Chungbuk). Similarly, abundance was the highest at Gyeonggi (1,235 individuals) and lowest at Kyeongnam (11 individuals). Species diversity (H’) was the highest at Chungbuk (5.14) and lowest at Kyeongnam (1.29). Composition of macrolepidopteran species also changed seasonally, showing regional variations. Dominant species in 9 study sites were Lamoria glaucalis in Gyeonggi, Ivela auripes in Gangwon, Idiotephria amelia in Chungbuk, agrotis tokionis in Chungnam, Acosmeryx naga in Jeonbuk, Glyphodes perspectalis in Jeonnam, Spodoptera depravata in Gyeongbuk, Xestia dilatata in Gyeongnam and Lithosia quadra Jeju. Among the species, Ivela auripes, Lamoria glaucalis, and Glyphodes perspectalis were known to be sporadic forest insect pests. Therefore, continuous monitoring can be needed to prevent the potential outbreaks of such insect pests.
Optimization of extraction conditions for the UPLC Analysis of Anti-diabetic Compounds
Nam-Sook Kim,Kyu Yeon Kim,Geum Joo Yoo,Ji Hyun Lee,Hyoung-Joon Park,Taeik Hwang,Seok Heo,Jeong-Hwa Cho,Jun-hyoung Kim,Dong Woo Shin,Chang-Yong Yoon,Sung-Kwan Park,Sun Young Baek 한국식품영양과학회 2016 한국식품영양과학회 학술대회발표집 Vol.2016 No.10
Nam, Ki-Hyun,Park, Sung-Ha,Lee, Won-Ho,Hwang, Kwang-Yeon Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.9
Hormone sensitive lipase (HSL) plays a major role in energy homeostasis and lipid metabolism. Several crystal structures of HSL-homolog proteins have been identified, which has led to a better understanding of its molecular function. HSL-homolog proteins exit as both monomer and dimer, but the biochemical and structural basis for such oligomeric states has not been successfully elucidated. Therefore, we determined the crystal structure of HSL-homolog protein EstE7 from a metagenome library at $2.2\;{\AA}$ resolution and characterized the oligomeric states of EstE7 both structurally and biochemically. EstE7 protein prefers the dimeric state in solution, which is supported by its higher enzymatic activity in the dimeric state. In the crystal form, EstE7 protein shows two-types of dimeric interface. Specifically, dimerization via the external ${beta}8$-strand occurred through tight association between two pseudosymmetric folds via salt bridges, hydrogen bonds and van der Waals interactions. This dimer formation was similar to that of other HSL-homolog protein structures such as AFEST, BEFA, and EstE1. We anticipate that our results will provide insight into the oligomeric state of HSL-homolog proteins.