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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>
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>
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.
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.
Shim, Yong Sub,Kim, Kyu Nyun,Hwang, Ju Hyun,Park, Cheol Hwee,Jung, Sun-Gyu,Park, Young Wook,Ju, Byeong-Kwon IOP 2017 Nanotechnology Vol.28 No.4
<P>Despite their generally good performance, photonic crystal (PC)-based organic light-emitting diodes (OLEDs) encounter a serious spectral distortion problem. In this study, we obtained spectral-distortion-free PC-based OLEDs by lowering the pitch (period of the PC) to less than a half the emission wavelength, using a simple and scalable nanoscale process of laser interference lithography. The demonstrated OLEDs with 200 nm pitch-size nanoscale periodic hole arrays exhibited negligible changes in the Internal Commission on Illumination 1931 color coordinate of Δ (0.0104, 0.0078) and a peak wavelength of Δ0 nm (relative to the reference), while maintaining the function of the internal light extraction layer, manifested as a 23% enhancement of the external quantum efficiency (EQE). The enhancement of the EQE reached 85% after incorporating a micro-lens array. The improved light extraction, spectral-distortion-free characteristic, and excellent color stability over a broad range of viewing angles were successfully derived by performing finite difference time domain simulations.</P>
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.