• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.152-154
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• 1999

본 논문에서 연구하는 $\mu$C/OS는 마이크로프로세서를 위한 선점형(Preemptive) 실시간(Real-Time) 멀티태스킹(Multitasking) 커널(kernal)로서, 연성실시간(SOFT Real-Time) 시스템 개발에 적합하다. $\mu$C/OS는 대부분의 소스코드가 C 언어로 작성되어 있으므로 실시간 커널의 연구에 용이하다. 본 논문에서는 $\mu$C/OS에서 처리할 수 있는 태스크(task)의 개수 확장을 위한 커널 모듈(mudule)의 설계 및 구현 방법을 기술한다. $\mu$C/OS는 초대 64개의 사용자 태스크를 관리할 수 있도록 구성되어 있다. 따라서 64개 이상의 태스크를 필요로 하는 시스템을 커널로서는 적절하지 못한 문제점이 있다. 이 문제의 해결을 위해 본 논문은 태스크의 개수를 256개로 확장하고 이에 따른 커널 모듈 구조의 확장, 변환 방법을 설명한다.

• Bulletin of the Korean Chemical Society
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• v.14 no.1
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• pp.137-143
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• 1993

The tetranuclear heterometallic complex CpMo$Os_3(CO)_{10}({\mu]-H)2[{\mu}3-{\eta}^2-C(O)CH_2Tol]\;(1,\;Cp={\eta}^5-C_5H_5,\;Tol=p-C_6H_4Me)$ has been examined by variable-temperature $^{13}$C-NMR spectroscopy and by a full three-dimensional X-ray structual analysis. Complex 1 crystallizes in the orthorhombic space group Pna2$_1$ with a = 12.960(1) ${\AA}$, b = 11.255(l) ${\AA}$, c = 38.569(10)${\AA}$, V = 5626(2) ${\AA}^3$ and ${\rho}$(calcd) = 2.71 gcm$^{-3}$ for Z = 8 and molecular weight 1146.9. Diffraction data were collectedon a CAD4 diffractometer, and the structure was refined to $R_F$ = 9.7% and $R_{W^F}$ = 9.9% for 2530 data (MoK${\alpha}$ radiation). There are two essentially equivalent molecules in the crystallographic asymmetric unit. The tetranuclear molecule contains a triangulated rhomboidal arrangement of metal atoms with Os(2) and Mo at the two bridgehead positions. The metal framework is planar; the dihedral angle between Os(l)-Os(2)-Mo and Os(3)-Os(2)-Mo planes is 180$^{\circ}$. A triply bridging (${\mu}_3,\;{\eta}^2$) acyl ligand lies above the Os(l)-Os(2)-Mo plane; the oxygen atom spans the two bridgehead positions, while the carbon atom spans one bridgehead position and an acute apical position. The molecular architecture is completed by an ${\eta}^5$-cyclopentadienyl ligand and a semi-triply bridging carbonyl ligand on the molybdenum atom, and nine terminal carbonyl ligands-four on Os(3), three on Os(l), and two on Os(2). The two hydride ligands are inferred to occupy the Os(l)-Os(2) and Mo-Os(3) edges from structural and NMR data.

• Journal of Korea Multimedia Society
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• v.5 no.3
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• pp.323-330
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• 2002

Recently, the existing embedded real-time operating systems(RTOSs) are being developed in terms of various modified versions in every application fields. Major characteristics and difference of these OSs lie in their distinct development of mechanisms which can be used in various environment and task-scheduling function which can control time-limited contingencies. In this paper, we design and implement round/robin scheduling algorithm based on time-sharing with equal-priority for multiple tasks which are provided preemptive and priority task allocation function in $\mu{C/OS-II}$ version 2.03. We propose the most important event-ready list structure in $\mu{C/OS-II}$; kernel, and provide the running result for multiple tasks with equal priority for the proposed structure.

• Proceedings of the Korea Multimedia Society Conference
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• 2001.06a
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• pp.8-11
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• 2001

다수의 RTOS(Real-Time Operating Systems)가 개발되면서 다양한 분야에서 적용되고 있다. 현재 RTOS는 가전제품과 같은 특정 목적의 장치들을 지원하기 위해 설계되어 있기 때문에 목적에 따라 설계 방향이 다양하게 개발되어 있다. 본 논문에서는 $\mu$ C/OS-II 대전 2.03 환경에서 동일한 우선 순위를 가진 여러 개의 태스크들을 관리하는 방법과 우선 순위에 기반한 선점 메커니즘을 지원하는 $\mu$ C/OS-II에서 동일 우선 순위를 가진 태스크들을 동작하도록 하는 기능을 추가하였다. 이를 위해 본 연구에서는 $\mu$ C/OS-II의 커널 구조를 변경하여 시뮬레이션을 수행하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.94-96
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• 2001

저전력 시스템에 대한 연구는 회로 수준에서부터 응용 소프트웨어 수준에 이르기까지 다양한 각도에서 이루어지고 있다. 본 연구에서 는 특히 운영 체제 수준, 즉 $\mu$C/OS-II(MicroC/OS-II) 커널 코드의 다양한 함수들에 대한 에너지 소비값을 추출하며 이 결과를 바탕으로 운영체재의 각 모듈별 에너지 소비를 분석한다. 이를 위하여 ARM7TDMI 마이크로 콘트롤러를 이용하여 제작된 시스템에 $\mu$C/OS-IIl 운영체제를 이식하고 SES(SNU Energy Scanner)툴을 이용하여 수행된 운영체제 코드의 각 모듈 즉 태스크 관리, 인터럽트 처리, IPC등에 대한 에너지 소비를 얻고 이 결과를 분석한다.

• Journal of the Institute of Convergence Signal Processing
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• v.10 no.3
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• pp.193-197
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• 2009

In this paper, we study on design of vehicle control system which is based on ${\mu}C/OS-II$, We component a electric motor drive system for simulator because the most of vehicle part use electric motor for actuator. We use the XC2287 microcontroller which is often used vehicle body controller because XC2287 guarantee high confidence and durability in vehicle industry. The electric motor control system derive PWM from general I/O port in XC2287 microcontroller. The signal is supplied at electric motor after amplifying that using driver circuit. The user control duty of PWM signal through controlling potentiometer which is connected to XC2287. through that, the user control speed of electric motor. we synchronize both input process via controlling potentiometer and PWM output process using semaphore. we verify porting of ${\mu}C/OS-II$ via experimentation.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.945-948
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• 2007

시리얼 통신은 다양한 분야의 임베디드 시스템에서 사용되는 통신 시스템의 일종이다. ${\mu}C/OS-II$는 실시간 임베디드 시스템에 사용되는 실시간 운영체제이다. S3C2440A 는 이러한 임베디드 시스템에 사용되는 마이크로 프로세서로 칩에 집적 된 UART 를 통하여 시리얼 통신을 지원한다. 이 논문에서는 시리얼 통신 중 ${\mu}C/OS-II$ 기반의 실시간 시스템을 위한 시리얼 통신의 설계와 S3C2440A로의 포팅을 한다.

• Journal of the korean academy of Pediatric Dentistry
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• v.36 no.3
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• pp.348-357
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• 2009

The purpose of this study was to evaluate the micro-tensile bond strength (${\mu}TBS$) of four luting resin to regional dentin of human primary teeth. Dentin from non-carious primary molars were prepared from different regions (s, superficial dentin; d, deep dentin; c, cervical dentin), and divided into groups based on anatomical locations and types of luting resins (Scotchbond Multi-purpose : SB ; One-Step : OS ; AdheSE Bond : ASE ; G-Bond : GB) : SB-s, SB-d, SB-c; OS-s, OS-d, OS-c; ASE-s, ASE-d, ASE-c ; GB-s, GB-d, GB-c. Luting resins were used according to the manufacturers' instructions, to bond $Light-Core^{TM}$ Core Build-Up Composite) to the exposed dentin specimens in the light-curing mode. After storage for 1 day, ${\mu}TBS$ was tested at a cross-head speed of 1 mm/min. Data were analyzed with T-test and two-way ANOVA. The bonding interface and fractography analyses were performed with SEM. The results were as follows : 1. ${\mu}TBS$ to superficial dentin was significantly higher than to deep dentin for SB(p<0.05). But there were no significant differences in regional ${\mu}TBS$ among OS, ASE, GB(p>0.05). 2. There were no significant differences in ${\mu}TBS$ to superficial dentin among each groups. But, in deep dentin, ${\mu}TBS$ of SB-d was significantly lower than those of OS-d, ASE-d, and GB-d(p<0.05). ${\mu}TBS$ of OS-d was significantly higher than those of GB-d(p<0.05), but there were no significant differences in ${\mu}TBS$ of ASEd. There were no significant differences among ${\mu}TBS$ of ASE-d, OS-d, and GB-d.

• Journal of Neurogastroenterology and Motility
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• v.24 no.4
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• pp.669-675
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• 2018

Background/Aims Functional dyspepsia (FD) and irritable bowel syndrome (IBS) are common gastrointestinal (GI) disorders and these patients frequently overlap. Trimebutine has been known to be effective in controlling FD co-existing diarrhea-dominant IBS, however its effect on overlap syndrome (OS) patients has not been reported. Therefore, we investigated the effect of trimebutine on the model of OS in guinea pigs. Methods Male guinea pigs were used to evaluate the effects of trimebutine in corticotropin-releasing factor (CRF) induced OS model. Different doses (3, 10, and 30 mg/kg) of trimebutine were administered orally and incubated for 1 hour. The next treatment of $10{\mu}g/kg$ of CRF was intraperitoneally injected and stabilized for 30 minutes. Subsequently, intragastric 3 mL charcoal mix was administered, incubated for 10 minutes and the upper GI transit analyzed. Colonic transits were assessed after the same order and concentrations of trimebutine and CRF treatment by fecal pellet output assay. Results Different concentrations (1, 3, and $10{\mu}g/kg$) of rat/human CRF peptides was tested to establish the OS model in guinea pigs. CRF $10{\mu}g/kg$ was the most effective dose in the experimental OS model of guinea pigs. Trimebutine (3, 10, and 30 mg/kg) treatment significantly reversed the upper and lower GI transit of CRF induced OS model. Trimebutine significantly increased upper GI transit while it reduced fecal pellet output in the CRF induced OS model. Conclusions Trimebutine has been demonstrated to be effective on both upper and lower GI motor function in peripheral CRF induced OS model. Therefore, trimebutine might be an effective drug for the treatment of OS between FD and IBS patients.

• Fisheries and Aquatic Sciences
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• v.16 no.2
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• pp.131-135
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• 2013

The presence of ostreid herpesvirus 1 (OsHV-1) and the percentage of viral DNA detected in Pacific oyster Crassostrea gigas adults were investigated monthly between May and November 2012 at three locations along the southern coast of Korea. Among 210 oysters examined by polymerase chain reaction (PCR) analysis, OsHV-1 DNA was detected in only one oyster collected in August. The low detection rate of OsHV-1 DNA was consistent with the lack of reported OsHV-1-associated disease in C. gigas cultured in Korea. The sequence of the present PCR product amplified with the C2/C6 primer pair was identical to that of OsHV-1 ${\mu}Var$ except for one nucleotide, and the sequence amplified with Del36-37F2/Del36-37R showed a 605-bp deletion as in OsHV-1 ${\mu}Var$. Although these sequence data are insufficient to determine genotype, the results suggest that the herpesvirus detected was similar to OsHV-1 ${\mu}Var$. This is the first report on the presence of OsHV-1 in adult Pacific oysters cultured in Korea.