메세지 전송을 이용한 클럭 동기화에 관한 연구

최용락,박진섭,하수철 大田大學校 1988 論文集 Vol.7 No.1

분산 실시간 시스템을 위한 로컬 스케줄러 확장에 관한 연구

하수철,최용락,박진섭 大田大學校 1988 論文集 Vol.7 No.1

This paper is a study on the scheduling mechanism for distributed real time systems. A MINIX system uses preemptive priority scheduling policy and round robin method which take multi-level queueing systems. but this method is unsuitable for distributed real time systems, because it is designed for single syytem environments and used fixed priority based on cpu time. This paper presents extended scheduling mechanism of MINIX system for distributed real time system environment. First, Decision Routine is designed for determination of the execution of the real time processes on the local node. Second. Local Scheduler and Global Scheduler are designed for lical scheduling and global scheduling of real time process based deadline and computation time. Designed module is implimented on MINIX system under IBM-PC/AT.

Genome-wide transcriptome analysis of rice genes responsive to chilling stress

Cho, Hyun Yong,Hwang, Sun-Goo,Kim, Dong Sub,Jang, Cheol Seong Canadian Science Publishing 2012 Canadian journal of plant science. Revue canadienn Vol.92 No.3

<P> Cho, H. Y., Hwang, S.-G., Kim, D. S. and Jang, C. S. 2012. Genome-wide transcriptome analysis of rice genes responsive to chilling stress. Can. J. Plant Sci. 92: 447-460. Low temperature is known to be one of the major challenges to rice production. We have selected chilling-tolerant TILLING of Donganbyeo, which showed significantly vigorous growth relative to wild-type plants under chilling stress conditions (10-12°C). We performed a comparative transcriptome analysis using a chilling-tolerant line and wild-type plant with the objective to evaluate genomic responses to chilling stress and to identify chilling inducible genes. Functional enrichment analysis results demonstrated that a large proportion of chilling-inducible genes were associated with certain biological pathways, e.g., monosaccharide catabolic processes, reflecting the energy requirements necessary for adaptation to sub-optimal temperatures in plants. Extremely low correlation coefficients in a range of −0.07 to 0.04 were detected between plant responses to chilling stress and different abiotic stress conditions such as drought, salt, cold, and heat; these results imply that plants might exploit strikingly different response mechanisms against stress conditions. The largest subnetwork, which was composed of 78 chilling-specific inducible genes, was found in the tolerant plants, but not in the wild-type plants, which probably implies the existence of a delicate and harmonious signaling pathway setup in the tolerant plants. Expression patterns of 20 chilling-responsive genes were assessed via abiotic stress treatments and phytohormone treatments. About 80% of the tested chilling-inducible genes were upregulated by exogenous abscisic acid (ABA) treatment. The results of this study may prove useful in elucidating the chilling-response pathway and in the development of chilling-tolerant rice varieties. </P>

Assessment of Pseudolite Layout under urban Environments Using a Simulation System for Seamless Positioning

Yong-Cheol Sub,Ryosuke Shibasaki 대한토목학회 2003 KSCE journal of civil engineering Vol.7 No.3

Vanillic acid inhibits inflammatory mediators by suppressing NF-κ觀B in lipopolysaccharide-stimulated mouse peritoneal macrophages

Kim, Min-Cheol,Kim, Su-Jin,Kim, Dae-Seung,Jeon, Yong-Deok,Park, Sung Joo,Lee, Ho Sub,Um, Jae-Young,Hong, Seung-Heon Informa Healthcare 2011 IMMUNOPHARMACOLOGY AND IMMUNOTOXICOLOGY Vol.33 No.3

<P>Vanillic acid is a benzoic acid derivative that is used as a flavoring agent. It is an oxidized form of vanillin. At present, the mechanisms by which vanillic acid exerts its anti-inflammatory effects are incompletely understood. In this study, we attempted to determine the effects of vanillic acid on lipopolysaccharide (LPS)-induced inflammatory responses in mouse peritoneal macrophages. Our findings indicate that vanillic acid inhibits LPS-induced production of tumor necrosis factor (TNF)-α慣 and interleukin (IL)-6. During the inflammatory process, the levels of cyclooxygenase (COX)-2 and nitric oxide (NO) increased in mouse peritoneal macrophages, but vanillic acid suppressed both the enhanced levels of COX-2 and the production of prostaglandin E<SUB>2</SUB> and NO. Moreover, vanillic acid suppressed the activation of nuclear factor-kappa B (NF-κ觀B) and caspase-1. These results provide novel insights into the pharmacological actions of vanillic acid and are indicative of the potential use of this molecule in the treatment of inflammatory diseases.</P>

Electrochemical Characteristics of HA Film on the Ti Alloy Using Pulsed Laser Deposition

( Yong Hoon Jeong ),( Seung Pyo Shin ),( Chae Heon Chung ),( Sang Sub Kim ),( Han Cheol Choe ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.5

In this study, we have investigated the surface morphology of hydroxyapatite (HA) coated Ti alloy surface using pulsed laser plating. The HA (tooth ash) films were grown by pulsed KrF excimer laser, film surfaces were analyzed for topology, chemical composition, crystal structure and electrochemical behavior. The Ti-6Al-4V alloy showed α and β phase, Cp-Ti showed α phase and the HA coated surface showed HA and Ti alloy peaks. The HA coating layer was formed with 1-2㎛droplets and grain-like particles, particles which were smaller than the HA target particle, and the composition of the HA coatings were composed of Ca and P. From the electrochemical test, the pitting potential (1580 mV) of HA coated Ti-6Al-4V alloy was higher than those of Cp-Ti (1060 mV) and HA coated Cp-Ti (1350 mV). The HA coated samples showed a lower current density than non-HA coated samples, whereas, the polarization resistance of HA coated samples showed a high value compared to non-HA coated samples.

Germination and Seedling Growth in Response to Ionizing Radiation in Creeping Bentgrass (Agrostis palustris Huds.)

Yong Jin Lee,Min Jeong Hong,Dae Yeon Kim,Tong Geon Lee,Dong Sub Kim,Jin Baek Kim,Byung Cheol Lee,Young Hwan Han,Yong Weon Seo 한국육종학회 2008 한국육종학회지 Vol.40 No.1

It was previously pointed out that mutation is the ultimate source of variation. Adequate variation is needed for plant breeding if there is a limitation in natural genetic resources. When the ionizing radiation has been known to cause chromosomal and genomic alternations, it is widely used for inducing mutagenesis. The electron beam as an ionizing radiation is the principal physical mutagens that induces mutation and effectively used in plant breeding. Since dose-response relationships of electron beam in plant species are rarely known, we investigated the seed germination rate and early seedling growth of irradiated seeds of creeping bentgrass (Agrostis palustris Huds., cv Penn-A1) with various electron beam irradiating conditions (1, 1.3, 2 MeV at both 0.03 mA and 0.06 mA with dose of 100 Gy (Gray) and 0.03, 1, 1.3, 2 MeV at 0.03 mA with dose of 200 Gy, respectively) using electron accelerator at Korea Atomic Energy Research Institute. The growth parameters in terms of shoot length, primary root length, and secondary root length showed similar response between 0.06 / 1 (mA / MeV) at 100 Gy and 0.03 / 0.3 (mA / MeV) at 200 Gy. Bentgrass seed germination was mainly affected by the intensity of irradiated dose (Gray). Germination rate was lowered as the irradiated dose increased. On the other hand, early seedling growth was mainly governed not by the dose of radiation but by voltage.

하나로 비상보충수의 노심 주입유량 시험 결과에 대한 고찰

박용철(Yong-Chul Park),이용섭(Yong-Sub Lee),최영산(Young-San Choi),정환성(Hoan-Sung Jung),임인철(In-Cheol Lim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10

When the water level of the reactor pool descends to an extremely low level due to a loss of reactor pool water accident in HANARO, a multi-purpose research reactor of a 30 MWth, the emergency water stored in the tank should be fed to the core by a gravity force. Last year, the reactor pool water was temporarily transferred to the emergency cooling water storage tank. And the water level came down to EL 77.5 m, 0.4 m above the extremely low level to install the in-pile section of a Fuel Test Loop in the reactor core. When the water was re-transferred into the reactor pool, an emergency water injection test was performed. This paper describes the test results and a consideration of the results. It was confirmed through the test that the injection flow rate was maintained above the design injection flow rate by setting the flow control valve at 3.5 turns to a partially open position.

병원직원의 노동조합 몰입에 영향을 미치는 요인

남철식 ( Cheol Shik Nam ),유승흠 ( Seung Hum Yu ),손태용 ( Tae Yong Sohn ),박웅섭 ( Woong Sub Park ) 한국병원경영학회 2004 병원경영학회지 Vol.9 No.3

The purpose of this study was to provide basic materials needed to enhance quality of organizational life by identifying the improvements of labor union management in the perspective of hospital organization management. The subjects of this study were 510 employees in 1 University Hospital and 3 General Hospitals in Metro Capital including Seoul. Materials were collected from administrators, nurses and medical technicians in target hospitals from April 26 to May 7, 2004 through survey questionnaires. The main results of this study were as follows: First, From the results of multiple regression analysis to identify major influencing factors of labor union commitment level, In University hospitals, males than females, and those who had senior officer posts in labor union showed higher positive correlation with the attitude of their colleagues. In general hospitals, those who had served in Union for shorter period showed higher commitment in union. Second, When looking into the major influencing factors on the level of commitment in labor union according to their jobs, male administrators showed higher positive correlation in the level of commitment in labor union and the relationship with union. Among nurses, those who had lower education level, those who had higher job satisfaction, those who had higher emotional attachment to their job, those who had better relationship with union and better satisfaction in union showed higher commitment level. In medical technicians, those who had higher emotional attachment to their job showed higher commitment level. To summarize study results, the level of commitment in labor union depends on job satisfaction, managers` attitudes, emotional attachment to their jobs, union satisfaction factors, their colleagues attitudes toward union and thee atmosphere of employer-employee relationship. Therefore hospital managers should have democratic and flexible attitudes toward labor union. Additionally, as job satisfaction is important determinant in union commitment, hospital managers should have countermeasures to enhance the job satisfaction level of hospital employees. Moreover, as managerial factors of the principal of hospital influence union commitment directly, the attitudes of hospital managers toward union and transparency of hospital management should be improved.

Rice RING E3 ligase may negatively regulate gamma-ray response to mediate the degradation of photosynthesis-related proteins.

Park, Yong Chan,Kim, Jung Ju,Kim, Dong Sub,Jang, Cheol Seong Springer-Verlag [etc.] 2015 Planta Vol.241 No.5

<P>In this study, our findings regarding the regulation of GA irradiation-induced OsGIRP1 in relation to the levels of photosynthesis-related proteins such as OsrbcL1 and OsrbcS1 and hypersensitive responses of overexpressing plants to GR irradiation provide insight into the molecular functions of OsGIRP1 as a negative regulator in response to the stress of radiation. The RING (Really Interesting New Gene) finger proteins are known to play crucial roles in various abiotic stresses in plants. Here, we report on RING finger E3 ligase, Oryza sativa gamma rays-induced RING finger protein1 gene (OsGIRP1), which is highly induced by gamma rays (GR) irradiation. In vitro ubiquitination assay demonstrated that a single amino acid substitution (OsGIRP1(C196A)) of the RING domain showed no E3 ligase activity, supporting the notion that the activity of most E3s is specified by a RING domain. We isolated at least 6 substrate proteins of OsGIRP1, including 2 Rubisco subunits, OsrbcL1 and OsrbcSl, via yeast two-hybridization and bimolecular fluorescence complementation assays. OsGIRP1 and its partner proteins were targeted to the cytosol and the cytosol or chloroplasts, respectively; however, florescence signals of the complexes with OsGIPR1 were observed in the cytosol. Protein degradation in cell extracts showed that OsGIRP1 mediates proteolysis of 2 substrates, OsrbcS1 and OsrbcL1, via the 26S proteasome degradation pathway. The Arabidopsis plants overexpressing OsGIRP1 clearly exhibited increased sensitivity to GR irradiation. These results might suggest that OsGIRP1 acts as a negative regulator of GR response to mediate the degradation of photosynthesis-related proteins.</P>