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      • 원격탐사를 위한 병렬계산 기법

        김형중,장태정,김희원,김형수,이정문,장순자 강원대학교 석재복합신소재제품연구센터 1996 석재연 논문집 Vol.1 No.-

        원격탐사에 사용되는 편미분방정식을 고속으로 풀기 위한 기법을 프로그래밍하고 성능을 향상시킬 수 있는 방법을 제시했다. 미지수가 30만개 이상되는 복소수(non-Hermitian) 행렬의 해를 구하는 프로그램을 작성했다. 이 프로그램은 C와 PVM에 기반을 두고 있다. 수렴속도를 향상시키기 위해 대각 스케일링을 이용했다. 통신속도의 개선을 위해 데이터 압축 기법을 이용했다. 수렴속도를 측정 제시함으로써 실제 문제 적용에 참고할 수 있다. Network-based computing with cluster of personal computers or workstations recently has become an important and successful technique. Network-based computing enables fast computation and resolves short of storage with computers on the desks. Cluster of inexpensive computers offers them aggregated computing power and storage to challenge very large-scale problems. Iterative solvers are used for the large sparse linear systems. Preconditioners accelerate the rate of convergence of the iterative solvers. However, parallelization accelerate the rate of convergence of the iterative solvers. However, parallelization of preconditioners is far from satisfaction so far. Thus, the simplest diagonal scaling is a good alternative for improved convergence and easy parallelization. In order to reduce communication overhead, a data compression technique is considered. Data communication time can be reduced at the cost of convergence rate. MATLAB simulation result is given in this paper. This method is effective to cluster of computers connected through slow networks.

      • KCI등재후보

        Effects of Phenytoin and Diazepam on the Seizure Activity in the Cortical Dysplasia Animal Models

        Kim, Si-Hyung,Choi, In-Sun,Cho, Jin-Hwa,Park, Eun-Ju,Jang, Il-Sung,Choi, Byung-Ju,Kim, Hyun-Jung,Kim, Young-Jin,Nam, Soon-Hyeun The Korean Academy of Oral Biology 2006 International Journal of Oral Biology Vol.31 No.2

        Dysplasia-associated seizure disorders are markedly resistant to pharmacological intervention. Relatively little research has been conducted studying the effects of antiepileptic drugs(AEDs) on seizure activity in a rat model of dysplasia. We have used rats exposed to methylazoxymethanol acetate(MAM) in utero, an animal model featuring nodular heterotopia, to investigate the effects of AEDs in the dysplastic brain. Pilocarpine was used to induce acute seizure in MAM-exposed and age-matched vehicle-injucted control animals. Field potential recordings were used to monitor amplitude and numbers population spikes, and paired pulse inhibition in response to stimulation of commissural pathway. Two commonly used AEDs were tested: diazepam 5, 2.5mg/kg;phenytoin 40, 60mg/kg. Diazepam(DZP) and phenytoin(PHT) reduced the amplitude of population spike in control and MAM-exposed rats. However, the amplitude of population spike was nearly eliminated in control rats as compared to the MAM-exposed rats. Pharmaco-resistance was tested by measuring seizure latencies in awake rats after pilocarpine administration(320mg/kg, i.p.) with and without pretreatment with AEDs. Pre-treatment with PHT 60 mg prolonged seizure latency in control rats, but not in MAM-exposed animals. The main findings of this study are that acute seizures initiated in MAM-exposed rats are relatively resistant to standard AEDs assessed in vivo. These data suggest that animal model with cortical dysplasia can be used to screen the effects of potential AEDs.

      • SCIESCOPUSKCI등재
      • SCIESCOPUSKCI등재
      • KCI등재

        Floristic study of Jang-do (Isl.) in Korea

        Son, Hyun-Deok,Gwon, Soon-Gyo,Jang, Jeong-Won,Sun, Eun-Mi,Kim, Byeol-Ah,Im, Hyoung-Tak The National Institute of Biological Resources 2013 Journal of species research Vol.2 No.2

        We investigated the flora of Jang-do (Isl.), an island of the Heuksan archipelago, located in Heuksan-myeon, Shinan-gun, Jeollanam-do and discussed the remarkable plants found there. Thirteen-field trips (total 27 days) were completed from May of 2004 to May of 2013. As a result, we identified the distribution of 423 taxa in Jang-do (Isl.), comprising 104 families, 285 genera, 335 species, 78 varieties and 10 forms. There are a total of 95 taxa of floristic regional indicator plants. The floristic regional indicators are as follows; four taxa of level V such as Impatiens furcillata, four taxa of level IV such as Hosta yingeri, 14 taxa of level III such as Ophioglossum vulgatum, 5 taxa of level II, and 58 taxa of level I. In addition 10 red data plants, 2 vulnerable species (VU) including Calanthe striata for. sieboldii, and 4 least concern species (LC) like Ardisia crenata, 2 not evaluated species (NE) such as Hosta yingeri, were found in the investigated area. An unrecorded species, Fragaria (Rosaceae), was found in a forest of Jang-do (Isl.) for the first time in Korea.

      • SCOPUSKCI등재

        Acinetobacter sp. BE-254에 의한 유화제의 생산

        김순한,임이종,최경숙,정영기,장경립,이태호 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.2

        Bioemulsifier를 생산하는 미생물을 토양으로부터 screening하였다. 그 중에서 유화활성과 유화안정성에서 가장 우수한 BE-254 균주를 순수분리하여 동정한 결과, Acinetobacter속으로 판명되었다. Bioemulsifier 생산을 위한 최적배지 조성은 n-hexadecane 4%, NaNO_3 0.2%, KH_2PO_4 0.05%, MgSO_4·7H_2O 0.05%, CaCl_2 0.01%, yeast extract 0.01%이였으며, 최적온도와 pH는 각각 30℃와 7.0이였다. 이러한 조건에서 500㎖용 shaking flask에 최적배지 50㎖를 넣어 배양했을 경우 대수증식기 말기인 5일째 균의 증식과 유화활성이 가장 높게 나타남에 따라 Acinetobacter sp. BE-254에 의한 bioemulsifier의 생산은 균의 생육과 밀접한 관련이 있는 것으로 판단되었다. 유화기질로서 hydrocarbon류, edible oil류, 그리고 petroleum fraction등에 작용시켰을 경우 이들 물질에 대해서 비교적 높은 활성을 나타내어 유화제 로서의 우수성을 시사 하였다. The strain producing bioemulsifier was isolated from soil samples. The isolated strain was identified as the genus Acinetobacter through its morphological, cultural and physiological characteristics. The highest emulsification activity and stability by Acinetobacter sp. BE-254 was observed after 5 days of cultivation in the culture medium containing n-hexadecane 4%, NaNO_3 0.2%, KH_2PO_4 0.01%, MgSO_4·7H_2O 0.01%, CaCl_2 0.01% and yeast extract 0.01%. The optimum pH and temperature for bioemulsifier production were pH 7.0 and 30℃, respectively. Furthermore the most of bioemulsifier was produced during the exponential growth phase, and this suggested that the bioemulsifier production was growth-associated. The bioemulsifier showed good emulsification activity on various emulsifying substrates such as hydrocarbons, edible oils, and petroeum fractions.

      • 농가 자가발효에 의한 사과식초의 생산

        김순동,장경숙,김미경 대구효성가톨릭대학교 식품과학연구소 1994 식품과학지 Vol.6 No.-

        사과농가에서 자가적으로 양질의 식초를 생산할 수 있는 방법을 조사하기 위하여 조직을 파쇄하여 담그는 방법으로서 단행복발효법(SSF)과 병행복발효법(CCF), 그리고 조직을 얇게 썰어서 복발효시키는 방법으로서 완전복발효(SCF)와 효모만 첨가시킨 후 초산발효는 자연적으로 이루어지도록한 방법(SYNF)을 상호비교하였다. 복발효를 위하여 시설비 규 모가 적고 사용이 편리하도록 한 용기를 제작하여 행하였다. 품질평가는 산생성능과 식초 내에 존재하는 과실의 향미를 관능검사를 통하여 조사하였고, 색상은 색차계로써, 유기산과 유리당은 HPLC법으로 측정하였다. 그 결과 복발효법 중에서는 SYNF법이 가장 양호하였으며 이 경우 SSF에서 보다 초산의 생성율은 다소 낮으나 과실의 색상과 향이 가장 우수하였으며 맛성분으로서 유리당의 함량이 높고 유기산의 조성이 다양하며 산도가 적당하여 초산음료로서의 가치성이 인정되었으며 농가에서의 간편한 자가 발효법으로 바람직하였다. 또 SYNF에 관여하는 초산균으로 2종이 분리되었으며 균주 SYNF-1은 당의 소비율이 낮은 반면 알코올의 이용율과 산생성능이 높은 주 발효균이었다. The study was conducted to research the desirable method for fermentation of acidic apple beverage in the farmhouse. Step by step fermentation(SSF), complex fermentation after crushing of the fruit(CCF), complex fermentation after slicing of the fruit(SCF) and natural fermentation added yeast only after slicing of the fruit(SYNF) were compared. The brief fermentor for using stationary complex fermentation in the farmhouse was made in this experiment. The ability of acid production, flavor, taste and color were measured by sensory evaluation and mechanical methods. The quality of vinegar by SYNF and SCF were estimated by color, flavor, content, composition of sugar, and organic acids, and which was a suitable fermentation method for the farmhouse. The strains of acetobacter, SYNF-1 and 2 were isolated from the SYNF vinegar, and if has been shown that the SYNF-1 was a main strain in this study.

      • 신경망 적응제어기의 성능향상에 관한 연구

        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.

      • Flavobacterium meningosepticum에 의한 균혈증 1예

        장성원,유진홍,진승원,김선우,김연식,박순민,이대훈,최민호,최주연,신완식,강문원,강지민 대한화학요법학회 1997 대한화학요법학회지 Vol.15 No.1

        1996년 6월 카톨릭대학교 부천성가병원에 뇌경색으로 입원했던 61세 남자 환자의 혈액에서 Flavobacterium meningosepticum을 분리하였다. 환자는 폐렴을 동반한 패혈증의 예로 ceftriaxone과 metronidazole을 투여하였으나 입원 48시간만에 사망하였다. Flabovacterium meningosepticum is a rae cause of nosocomial infection which shows multi-drug resistance. It mainly invades patients with impaired immunity. Recently, we experienced a case of F. meningosepticum bacteremia in a patient with chronic debilitated state owing to stroke. The clinical progress was so rapid that he died within 48 hours. Blood culture revealed F. meningosepticum which showed characteristic yellow colony in blood agar plate.

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