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CORBA를 이용한 네트워크 모니터링 시스템의 설계 및 구현
오인환,김지예,엄영익 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.1
Network management that has become an important issue for the rapidly growing Internet is actively studied for efficient channel management, particularly for the overloaded ones. For this management, packet monitoring techniques and analysis methodologies based on the monitored packets are fundamental components. In this paper, we designed and implemented network monitoring system that provides users the network status and performance information from the network packets over the channel. The system is implemented in the CORBA environment and written in the Java language in order to provide independence of heterogeneous platforms as well as scalability to various development environments. In particular, this system provides users transparency and convenience for monitoring the Internet because it is implemented in the portable language Java.
Mediterraneibacter butyricigenes sp. nov., a butyrate-producing bacterium isolated from human faeces
JI-SUN KIM,Keun Chul Lee,Min Kuk Suh,Kook-Il Han,Mi Kyung Eom,Juhuck Lee,SEUNG-HWAN PARK,Se Won Kang,Jam-Eon Park,Byeong Seob Oh,Seung Yeob Yu,Seung-Hyeon Choi,Dong Ho Lee,Hyuk Yoon,Byung-Yong Kim,Seu 한국미생물학회 2019 The journal of microbiology Vol.57 No.1
A Gram-stain-positive, obligately anaerobic, non-motile, nonspore- forming, and rod-shaped bacterial strain, designated KGMB01110T, was isolated from a faecal sample of a healthy male in South Korea. Phylogenetic analysis based on 16S rRNA gene showed that strain KGMB01110T belonged to Clostridium cluster XIVa and was most closely related to Mediterraneibacter glycyrrhizinilyticus KCTC 5760T (95.9% 16S rRNA gene sequence similarity). The DNA G + C content of strain KGMB01110T based on its whole genome sequence was 44.1 mol%. The major cellular fatty acids (> 10%) of the isolate were C14:0 and C16:0. The strain KGMB01110T was positive for arginine dihydrolase, β-galactosidase-6-phosphatase, and alkaline phosphatase. The strain KGMB01110T also produced acid from D-glucose and D-rhamnose, and hydrolyzed gelatin and aesculin. Furthermore, HPLC analysis and UV-tests of culture supernatant revealed that the strain KGMB01110T produced butyrate as the major end product of glucose fermentation. Based on the phylogenetic and phenotypic characteristics, strain KGMB01110T represent a novel species of the genus Mediterraneibacter in the family Lachnospiraceae. The type strain is KGMB01110T (= KCTC 15684T = CCUG 72830T).
Eom, Yong-Sung,Son, Ji-Hye,Lee, Hak-Sun,Choi, Kwang-Seong,Bae, Hyun-Cheol,Choi, Jeong-Yeol,Oh, Tae-Sung,Moon, Jong-Tae The Korean Microelectronics and Packaging Society 2015 마이크로전자 및 패키징학회지 Vol.22 No.1
An electro-plating technology on a cured isotropic conductive pattern with a hybrid Cu paste composed of resin matrix, copper, and solder powders has been developed. In a conventional technology, Ag paste was used to perform a conductive pattern on a PCB or silicon substrate. From previous research, the electrical conductive mechanism and principle of the hybrid Cu paste were concisely investigated. The isotropic conductive pattern on the PCB substrate was performed using screen-printing technology. The optimum electro-plating condition was experimentally determined by processing parameters such as the metal content of the hybrid Cu paste, applied current density, and time for the electroplating in the plating bath. The surfaces and cross-sections were observed using optical and SEM photographs. In conclusion, the optimized processing conditions for Cu electro-plating technology on the conductive pattern were a current density of $40mA/cm^2$ and a plating time of 20min on the hybrid Cu paste with a metal content of 44 vol.%. More details of the mechanical properties and processing conditions will be investigated in further research.
1-Methyl Tryptophan Increase Cell Death of Hepatic Stellate Cells Arrested by Interferon-gamma
( Ji Eun Oh ),( Soon Koo Baik ),( Young Woo Eom ) 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: Liver fibrosis, a precursor to cirrhosis, is the result of deposition of extracellular matrix (ECM) proteins and is mediated primarily by activated hepatic stellate cells (HSCs). In this study, we investigated the effect of interferon (IFN)-gamma on the activation and proliferation of HSCs in vitro. Methods: Human hTERT immortalized HSCs were kindly given by Dr. KS Lee (Yonsei University, Seoul, Korea). After IFN-gamma treatment, cell signaling pathways and DNA content were analyzed to assess inactivation of HSCs or down-regulation of HSC proliferation. Inhibitor (1-methyl tryptophan; 1-MT) of indoleamine 2,3-dioxygemase (IDO) expressed by IFN-g was used to assess whether IDO played key roles on regulation of activated HSCs. Results: IFN-gamma significantly inhibited growth of HSCs and down-regulated the expression of alpha-smooth muscle actin (SMA) in HSCs. IDO was dramatically expressed by IFN-gamma through STAT1 activation and resulted in depletion of tryptophan. These depletion induced G1 cell cycle arrest in HSCs. When IFN-gamma-mediated G1 cell cycle arrest was released by treatment with 1-MT, apoptosis was observed dramatically in HSCs through induction of IRF-1 and FAS. Conclusions: Treatment with IFN-gamma alone or co-treatment with IFN-gamma and 1-MT inhibited growth of HSCs and down-regulated the expression of alpha-SMA in HSCs. Moreover, IFN-gamma and 1-MT induced apoptosis in HSCs through expression of IRF-1 and FAS. Our results suggest that inhibition of IDO enhance the down-regulation of activated HSCs and therefore co-treatment with IFN-gamma and 1-MT can be applied to ameliorate liver fibrosis.
Ji-Eun Oh,Young Woo Eom 대한의생명과학회 2016 Biomedical Science Letters Vol.22 No.1
Several studies have investigated the various effects of dexamethasone (Dex) on the proliferation and differentiation of mesenchymal stem cells (MSCs). Previously, we reported that co-treatment with L-ascorbic acid 2-phosphate and fibroblast growth factor (FGF)-2 maintained differentiation potential in MSCs through expression of hepatocyte growth factor (HGF). In this study, we investigated the effects of co-treatment with FGF-2 and Dex on the proliferation and differentiation potential of MSCs during a 2-month culture period. Co-treatment with FGF-2 and Dex increased approximately a 4.7-fold higher accumulation rate of MSC numbers than that by FGF-2 single treatment during a 2-month culture period. Interestingly, co-treatment with FGF-2 and Dex increased expression of HGF and maintained adipogenic differentiation potential during this culture period. These results suggest that co-treatment with FGF-2 and Dex preserves the proliferation and differentiation potential during long-term culture.
Eom, Ji Mi,Oh, Hyun Gon,Cho, Il Hwan,Kwon, Sang Jik,Cho, Eou Sik American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.11
<P>Niobium oxide (Nb2O5) films were deposited on p-type Si wafers and sodalime glasses at a room temperature using in-line pulsed-DC magnetron sputtering system with various duty ratios. The different duty ratio was obtained by varying the reverse voltage time of pulsed DC power from 0.5 to 2.0 micros at the fixed frequency of 200 kHz. From the structural and optical characteristics of the sputtered NbOx films, it was possible to obtain more uniform and coherent NbOx films in case of the higher reverse voltage time as a result of the cleaning effect on the Nb2O5 target surface. The electrical characteristics from the metal-insulator-semiconductor (MIS) fabricated with the NbOx films shows the leakage currents are influenced by the reverse voltage time and the Schottky barrier diode characteristics.</P>
Eom, Dae-Seok,Choi, Won-Seok,Ji, Suena,Cho, Jin W.,Oh, Young J. Lippincott Williams Wilkins, Inc. 2005 NEUROREPORT - Vol.16 No.8
Recent studies indicate that activation of stress-activated protein kinases may be implicated in a broad range of biological activities including differentiation. To directly examine whether stress-activated protein kinases are involved in neuronal differentiation, we utilized retinoic acid-induced and spontaneous models of neurite outgrowth in dopaminergic neurons. Here, we show that retinoic acid-induced neurite outgrowth in MN9D dopaminergic neuronal cells was accompanied by activation of c-Jun N-terminal kinase but not p38. Consequently, cotreatment with a specific inhibitor of c-Jun N-terminal kinase or overexpression of c-Jun N-terminal kinase-binding domain of c-Jun N-terminal kinase-interacting protein-1 blocked retinoic acid-induced neurite outgrowth. In primary cultures of dopaminergic neurons, the extent of neurite outgrowth increased spontaneously in a time-dependent manner. When these cultures were treated with a specific inhibitor of c-Jun N-terminal kinase, the total extent of neurites, the primary neurite length and the number of neurites per cell were suppressed significantly. Thus, our data indicate that the c-Jun N-terminal kinase signal seems to play an important role during morphological differentiation in cultured dopaminergic neurons.