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김관수,최재석,이순영,장순용 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1999 自動化 및 컴퓨터應用技術 Vol.6 No.1
In this paper, the direct and indirect neural adaptive controller are combined based on the Lyapunov synthesis approach. The proposed adaptive controller is constructed from RBF neural network and a set of fuzzy IF-THEN rules. And the weighting parameters are adjusted on-line according to some adaptation law for the purpose of controlling the plant to track a given trajectory. In this scheme, fuzzy IF-THEN rules are used to decide the combined weighting factor. It is shown that all the signals in the closed-loop system are uniformly bounded under mild assumptions. The effectiveness of the proposed control scheme is demonstrated through the control of one-link rigid robotics manipulator.
Gwan-Seok Lee,Seol-Mae Lee,Hae-Ryun Kwak,Chang-Seok Kim,Hong-Soo Choi,Sukchan Lee,Kyeong-Yeoll Lee 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.10
The sweet potato whitefly, Bemisia tabaci (Gennadius, 1889) (Hemiptera: Aleyrodidae), is one of the most important agricultural pests by direct feeding and begomovirus transmission in the world. B. tabaci species complex consisting of about 30 species worldwidely has been mainly distinguished by molecular methods because of difficulties detecting morphological differences. In Korea, distribution of two exotic groups, the Mediterranean (Q biotype) and the Middle East-Asia Minor 1 (B biotype), were confirmed by comprehensive molecular methods in 2012. Of them, the Q biotype as a vector of Tomato yellow leaf curl virus (TYLCV) has caused significant crop yield losses. Tobacco leaf curl virus (TbLCV), one of four begomoviruses in Korea, was first reported in 2011. It damaged, although not frequent, to greenhouse tomatoes at Iksan, Gimje, Sunchang, and Jeju. The vector transmitting TbLCV, however, is not known yet. In this study, we sampled an unknown B. tabaci populations on leaves of the Japanese honeysuckle (Lonicera japonica) at Iksan in outdoor conditions. PCR analysis revealed that some populations were infected with TbLCV. We identified an unknown indigenous genetic group named as JpL and clarified its phylogenetic relationships based on nucleotide sequences of mitochondrial cytochrome oxidase I gene.
Gwan-Seok Lee,Jongwoon Seong,Hae-Ryun Kwak,Chang-Seok Kim,Hong-Soo Choi,Hong-Hyun Park 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
The small brown planthopper (SBPH), Laodelphax striatelleus (Fallén), is a insect vector of Rice stripe virus (RSV) in temperate countries such as Korea, Japan, China, and Taiwan. As SBPH is able to overwinter successfully in these areas, RSV disease in subsequent rice fields has been believed to be endemic. In Korea, however, the RSV disease outbreaks have been observed mainly but not continuously at some western regions since 2001, caused a severe damage to the rice production. Although many efforts are underway to explain the outbreak phenomenon, the exact related factors are not known yet. In the meantime of the study on SBPH population dynamics in 2009, we catched unusually large numbers of SBPH adults by aerial net traps, maximally over 900, in early June at western coastal counties such as Taean, Seocheon, Buan, Sinan, and Jindo in Korea. Age distribution changes of SBPH in winter and post-winter seasons at some selected fields shows that the adults might be not related to overwintering population. The adults of overwintering population emerged from early April. Newly hatched nymphs of first generation were found from mid-May. In late May, just before the unusual catch of adults, the developmental stages of SBPH were mostly below 5th instars. This means that the big adult populations would be results of mass migration of SBPH abroad. We present also spacial distribution and host relationship of overwintering population as well as viruliferous rate changes of immigratory population.
Deinococcus rubellus sp. nov., bacteria isolated from the muscle of antarctic fish
Seok-Gwan Choi,Seon Hwa Jeon,Jae-Bong Lee,Eun Sun Joo,Sangyong Lim,Hee-Young Jung,Myung Kyum Kim 한국미생물학회 2016 The journal of microbiology Vol.54 No.12
Two new bacterial strains designated as Ant6T and Ant18 were isolated from the muscle of a fish which had been caught in the Antarctic Ocean. Both strains are Gram-stain-positive, catalase positive, oxidase negative, aerobic, and coccoid bacteria. Phylogenetic analysis based on the 16S rRNA gene sequences of strains Ant6T and Ant18 revealed that the strains Ant6T and Ant18 belong to the genus Deinococcus in the family Deinococcaceae in the class Deinococci. The highest degrees of sequence similarities of strains Ant6T and Ant18 were found with Deinococcus alpinitundrae LMG 24283T by 96.4% and 96.8%, respectively. Strain Ant6T exhibited a high level of DNA- DNA hybridization values with strain Ant18 (82 ± 0.6%). Chemotaxonomic data revealed that the predominant fatty acids were C17 : 0 cyclo, 16:0, and feature 3 (C16:1 ω6c/ω7c) for both strains. A complex polar lipid profile consisted of major amounts of unknown phosphoglycolipids (PGL) and unknown aminophospholipid (APL). Based on the phylogenetic, phenotypic, and chemotaxonomic data, strains Ant6T (=KEMB 9004-169T =JCM 31434T) and Ant18 (=KEMB 9004- 170) should be classified as a new species, for which the name Deinococcus rubellus sp. nov. is proposed.
Gwan-Seok Lee,Seol-Mae Lee,Chang-Seok Kim,Hong-Soo Choi,Kyeong-Yeoll Lee,Wonhoon Lee 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
Field surveys for the B. tabaci species complex were conducted from 2009 to 2013 in Korea, and the results were compared with published data of the B. tabaci complex. Three species, Mediterranean, Middle East-Asia Minor 1, and JpL, were determined from several regions based on mitochondrial COI sequences. The Mediterranean was mainly collected in greenhouses, displacing the earlier invasive species, Middle East-Asia Minor, and the JpL was collected in the field. The JpL is newly confirmed as a unique species of B. tabaci complex in Korea and Japan.
긴급 내시경검사에 의한 상부 위장관 출혈의 임상적 고찰
송관석(Gwan Seok Song),안혜진(Hea Jin An),김걸(Geol Kim),최일균(Il Kun Choi),최조영(Jo Young Choi),곽정재(Jeong Jae Gwak),이상용(Sang Yong Lee) 대한내과학회 1988 대한내과학회지 Vol.35 No.2
N/A Upper gastrointestinal tract bleeding has been a common clinical problem for several decades with a relatively high mortality rate. According to the literature the cause and nature of such bleeding is controversial despite the improved diagnostic procedure and treatment method available today. Emergency endoscopy was performed in patients with upper gastrointestioal tract bleeding for a 6year period, from Jan. 1982 to Dec. 1987, at Incheon Christian Hospital. The following results were obtained: 1) The ratio of male to female patients was 3.4:1 2) The age distribution revealed that the peak incidence of bleeding occured in the 5th decade of life. 3) The causative diseases were in the order of frequency of gastric ulcer (28.6%), duodenal ulcer(24.4%), eso. varices (16.8%),erosive gastritis (13.8%) and gastric ca. (8.2%). 4) The mode of bleeding was hematemesis in 27% of the cases, melena in 29%, and mixed type in 44/o. 5) According to Palumbo classification, the severity of bleeding was mimmal in 35.7% of the cases, moderate in 43.9% and massive in 30.4%. 6) Blood transfusions were done in 145 cases (74% of all cases). Of these, 1-5 pints were given in 43% of the cases, 6-10 pints pints in 18%, and more than 26 pints in 0.5%. Blood transfusions were not given in 26% of all cases. 7) Of the 196 ca the time of endoscopic examination after the episode of bleeding was within 6hr in 33 cases(16.8%), within 6-12hr in 46 cases (23.5%), within 12-24hr in 53 cases(27%) and within 24-36hr in 28 cases(14.3%). In total, 67,3% of the cases were examined within 24hr and 95.4% within 48hr. 8) The state of the lesions upon endoscopic examination was active bleeding in (39 cases) 19.9%, recent bleeding in 90 cases(46%), lesion only in 63 cases(32.1%), and no lesions were found in 4 cases(2%). 9) The treatment consisted of medical and surgical methods; medical in 86.2% of the cases and surgical in 13.8%. 10) The overall mortality was 9.7%.
남극 남쉐틀랜드 군도 주변 해저면 음향신호를 이용한 상업용 어군탐지기 보정 연구
최석관 ( Seok-gwan Choi ),이형빈 ( Hyungbeen Lee ),이경훈 ( Kyounghoon Lee ),이재봉 ( Jaebong Lee ) 한국어업기술학회 2016 수산해양기술연구 Vol.52 No.4
Commercial split beam echosounder (ES70) installed on a krill fishing vessel was calibrated in order to utilize it in estimating biomass of Antarctic krill (Euphausia superba). The method of calibration was to analyze the difference between the bottom backscattering strength of the commercial split beam echosounder (i.e. ES70) and the scientific echosounder (i.e. EK60) at one of transects near South Shetland Islands designated by CCAMLR. 38 kHz and 120 kHz were used for the calibration, and krill swarm signal levels obtained from multi frequencies, was examined to verify the calibration result. The analysis result indicated possibility of calibration by bottom backscattering strength, since the proportion of krill swarm signals within 2 dB < S<sub>V 120 kHz-38 kHz</sub> < 12 dB (i.e. a common S<sub>V 120 kHz-38 kHz</sub> range of 38 kHz and 120 kHz to be an indicator of Antarctic krill) over the total acoustic signals were 26.95% and 92.04%, respectively before and after the calibration.
최석관 ( Seok-gwan Choi ),오택윤 ( Taeg Yun Oh ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.2
The characteristics of the oceanographic environment in the Aleutian Basin of the Bering Sea during spring in 1996, 1997, and 1999 were clarified. An investigation of the water properties revealed five basic layers in the Bering Sea during spring: (1) a surface layer of warm and low-salinity water induced by solar heating, (2) a subsurface layer of cold and low-salinity water propagated slowly by heat from the surface layer, (3) a thermo cline layer where salinity was constant but temperature sharply decreased. (4) a temperature inversion layer, and (5) a deep layer with a gradual decrease in temperature and increase in salinity toward the bottom. The ranges of water temperature and salinity were l.8-5.5t and 31.81-34.08 in 1996, 1.5-7.2t and 31.9-34.06 in 1997, and 0.5-5.6°C and 32.0-34.11 in 1999, respectively. The water temperature of the surface layer was approximately I .6°C higher in 1997 than in 1996 and 1999. The lowest temperature at a depth of 100-150 m was about I t lower in 1999 than in 1996 and 1997. Nutrient levels (nitrate, phosphate. and silicate) contributing to the control of the growth of phytoplankton were higher in the Aleutian Basin than in the eastern continental shelf and Bogoslof Island area. This was closely associated with the phytoplankton distribution. Nutrient concentrations were lowest at a depth of 25 m. The high primary production at that depth was confirmed from the vertical distribution of chlorophyll a. Chlorophyll a levels were above 4.0 uL-1 in some areas in 1996 and 1999. but below 2.0 uL-1 in most areas in 1997. Zooplankton density was about three times higher in 1999 than in 1997.
최석관 ( Seok-gwan Choi ),윤은아 ( Eun-a Yoon ),한인우 ( Inwoo Han ),오우석 ( Wooseok Oh ) 한국수산과학회(구 한국수산학회) 2016 한국수산과학회지 Vol.49 No.6
This study compared the density of fish determined using three different echogram methods: the frequency-differ-ence, time variable, and threshold modification methods. An acoustic survey was conducted off the coast of Jeju Island after sunset. Data at 38 and 120 kHz frequencies were collected using a commercial fishing vessel. As a refer-ence point, the value of ΔMVBS<sub>120-38kHz </sub> that distinguished fish from zooplankton using the 38 and 120 kHz frequen-cies was set at < 2 dB. The estimated density of fish along the survey line was 0.1-30.4, 0.1-64.3, and 0.1-51.7 m<sup>2</sup>/ nmi<sup>2</sup> using the frequency difference, time variable threshold, and threshold modification methods, respectively. The results of this study constitute basic research for estimating fish densities.