• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.274-277
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• 2009

본 논문에서는 소형 PEM(Proton Exchange Membrane) 연료전지 스택의 BOS(Balance of Stack) 제어에 관하여 논의한다. 별도의 가습 장치가 필요치 않고 BOS의 구성이 비교적 간단한 소형 PEM 연료전지 시스템에서는 팬과 퍼지밸브만의 제어를 통해 스택 내부 수분의 조절과 열 관리가 수행된다. 따라서 본 논문에서는 부하에 따른 최적의 공기유량을 계산하고 요구되는 유량의 공급을 위해 팬을 제어하는 알고리즘을 통해 소형 연료전지 시스템의 과도응답 특성과 안정성을 향상시키는 방법에 관하여 제안한다. 150W급 소형 연료전지 시스템을 꾸미고, 마이크로컨트롤러를 이용한 제어회로를 구현하여 실험함으로써 제안된 알고리즘의 유용함을 검증하였다.

• Journal of Nutrition and Health
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• 제32권3호
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• pp.221-229
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• 1999

Certain indigestible oligosaccharides may benefit gastrointestinal tract via fermentation and proliferation of desirable bacterial species. The purose of this study was to elucidate the effect of selected oligosaccharides, such as fructooligosaccharides(FOS), soybean oliosaccharides(SOE), and highly concentrated branched oligosaccharides(HiBOS), on fecal micorflora proliferation, lipid concentration, lipid peroxide formation and antioxidant enzymes acitivies in plasma and liver of the rats. Thirty two male Sprague-Dawley rats were randomly assigned to one of four treatments ; 1) control diet(AIN-93G diet); 2) control diet +5% FOS ; 3) control diet + 5% SOE ; 4) control diet + 5% HiBOS. The duration of the study was 4 weeks. Fecal bifidobacteria concentration were significantly higher (p<0.05) in the HiBOS group compared with the control after 4 weeks of dietary treatment. FOS and SOE groups also had higher fecal bifidobacteria levels than control, but statistical significance was not found. The concentration of plasma total lipid was decreased by oligosaccharide consumption, especially in HiBOS group(p<0.05). The concentration of plasma total triglyceride was significantly lower in all of the oligosaccharide containing groups compared with the control(p<0.05). The plasma total cholesterol concentration tended to be lower in the oligosaccharide consuming groups than control. The concentrations of hepatic total lipid, triglyceride and total cholesterol were not affected by consumption of oligosaccharides. Thiobarbituric acid reactive substance(TBARS) concentrations and antioxidant enzyme activities in plasma and liver were not affected much by experimental diets. There results suggest that dietary oligosaccharides may be beneficial for increasing intestinal bifidobacteria and lowering plasma lipid levels.

• 신재생에너지
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• 제2권2호
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• pp.16-22
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• 2006

This paper present the performance evaluation of PV systems installed at Tibet area of China in order to identity the key factors that determines system operation at a severe climate conditions and promote the cooperation of PV technology between Korea and China. The installed systems consist of 100kW on-grid connected PV systems, BOS(balance of systems), data acquisition and transmission equipments. The Korea side supplied the solar cell, BOS like as inverter, control box and monitoring system. And the Chinese side assembled solar module, constructed site and built control house. It has been shown that the average radiation per monthly from Tibet is 1.5 times larger than that from Mokpo. Also, radiation time from Tibet is 2hour higher than that from Korea.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 춘계학술대회
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• pp.125-129
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• 2006

This paper presents the isolation and performance evaluation of PV systems installed at Tibet area of China in order to identity the key factors that determines system operation at a severe climate conditions and promote the cooperation of PV technology between Korea and China. The installed systems consist of 100kW on-grid connected PV systems, BOS(balance of systems), data acquisition and transmission equipments. The Korea side supplied the solar cell, BOS like as inverter, control box and monitoring system. And the Chinese side assembled solar module by using Koreans solar cells, constructed site and built control house.

• The Journal of Korean Physical Therapy
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• 제29권3호
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• pp.135-141
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• 2017

Purpose: This study was to identify the anticipatory postural adjustment (APA) mechanism which is represented by the onset time of trunk muscles and the displacement of the center of pressure (COP) according to the different base of support (BOS) during upper extremity movement. Methods: Thirty healthy subjects (14 males, 16 females) participated in this study. The movement was performed for 10 trials during each of various BOS (shoulder - width double leg stance, narrow base double leg stance, tandem stance, non-dominant single leg stance) at the 1.2 Hz frequency. Electromyography was used to measure muscle onset time and biorescue was used to measure characteristics of the displacement of COP. Surface bipolar electrodes were applied over the right deltoid anterior, right latissimus dorsi, both rectus abdominis, both internal oblique and both erector spinae. The data were analyzed by repeated one-way ANOVA and Duncan's post hoc test. Results: The study has revealed following. There were significant differences with muscle onset time in each BOS (p<0.01). There were significant differences in characteristics of the COP in each BOS (p<0.01). Conclusion: The study found that the more narrowed the basis requires the more rapid anticipatory postural control in contralateral postural muscle when the upper extremity movement is performed.

• 전력전자학회논문지
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• 제13권6호
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• pp.469-475
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• 2008

본 논문에서는 소형 PEM(Proton Exchange Membrane) 연료전지 스택의 마이크로프로세서를 이용한 제어에 관하여 소개한다. 연료전지 제어의 핵심 기술인 스택 내부의 수분 관리는 부하에 의해 요구되는 연료와 온도에 따른 냉각용 공기의 유량을 적절하게 조절하고, 잉여수분을 스택으로부터 배출시킴으로써 성취된다. 이러한 주변장치(BOS: Balance of Stack)의 제어는 시스템의 안정적인 운전을 좌우하는 중요한 요소이기 때문에 이를 정확하게 제어하는 것이 매우 중요하다. 본 연구에서는 최적 운전조건에서 공기유량과 퍼지주기를 측정하고 이를 바탕으로 BOS를 제어함으로써 BOS의 소비전력을 최소화하여 연료 효율을 향상시킬 수 있었으며, 이를 실험을 통해 검증하였다. 마이크로프로세서를 이용하여 개발된 제어기는 시스템의 운전 안정성을 향상시켜 소형 연료전지 스택의 제어에 널리 사용될 것으로 기대된다.

• Asian-Australasian Journal of Animal Sciences
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• 제32권8호
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• pp.1069-1076
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• 2019

Objective: Yunnan is not only a frontier zone that connects China with South and Southeast Asia, but also represents an admixture zone between taurine (Bos taurus) and zebu (Bos indicus) cattle. The purpose of this study is to understand the level of genomic diversity and the extent of admixture in each Yunnan native cattle breed. Methods: All 120 individuals were genotyped using Illumina BovineHD BeadChip (777,962 single nucleotide polymorphisms [SNPs]). Quality control and genomic diversity indexes were calculated using PLINK software. The principal component analysis (PCA) was assessed using SMARTPCA program implemented in EIGENSOFT software. The ADMIXTURE software was used to reveal admixture patterns among breeds. Results: A total of 604,630 SNPs was obtained after quality control procedures. Among six breeds, the highest level of mean heterozygosity was found in Zhaotong cattle from Northeastern Yunnan, whereas the lowest level of heterozygosity was detected in Dehong humped cattle from Western Yunnan. The PCA based on a pruned dataset of 233,788 SNPs clearly separated Dehong humped cattle (supposed to be a pure zebu breed) from other five breeds. The admixture analysis further revealed two clusters (K = 2 with the lowest cross validation error), corresponding to taurine and zebu cattle lineages. All six breeds except for Dehong humped cattle showed different degrees of admixture between taurine and zebu cattle. As expected, Dehong humped cattle showed no signature of taurine cattle influence. Conclusion: Overall, considerable genomic diversity was found in six Yunnan native cattle breeds except for Dehong humped cattle from Western Yunnan. Dehong humped cattle is a pure zebu breed, while other five breeds had admixed origins with different extents of admixture between taurine and zebu cattle. Such admixture by crossbreeding between zebu and taurine cattle facilitated the spread of zebu cattle from tropical and subtropical regions to other highland regions in Yunnan.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 춘계학술대회
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• pp.284-287
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• 2007

This paper presents the performance evaluation of PV systems installed at Tibet area of China in order to identity the key factors that determines system operation at a severe climate conditions and promote the cooperation of PV technology between Korea and China. The installed systems consist of 100kW on-grid connected PV systems, BOS(balance of systems), data acquisition and transmission equipments. The Korea side supplied the solar cell, BOS like as inverter, control box and monitoring system. And the Chinese side assembled solar module, constructed site and built control house. It has been shown that the average radiation per monthly from Tibet is 1.5 times larger than that from Mokpo. Also, radiation time from Tibet is 2hour higher than that from Korea. The economical analysis has shown that with the current prices, investment in a grid connected PV systems is generally profitable

• 제어로봇시스템학회논문지
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• 제16권9호
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• pp.823-826
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• 2010

In this study, the control method of assistive robot was developed for the elderly. The control method of gait-assistant-robot was proposed considering the change of COP (Center of Pelves), BOS (Base of Support) and comparative analysis of the moving velocity for the elderly. We analyzed the movement of COP of the body and its velocity of the elderly equipped with manual walker and gait-assistant-robot. As a result, change in COP was greater from left to right than from anterior to posterior; also, the average velocity of the movement of COP and manual walker for manual walker gait was 0.7(m/s). Therefore, it is necessary to concern more on the left-right balance and synchronization of the velocity of COP.

• 대한수의학회지
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• 제52권4호
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• pp.231-238
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• 2012

The expression profiles of inflammatory cytokines viz. interleukins (IL)-6, IL-8, IL-12, granulocyte macrophage-colony stimulating factor, interferon-${\gamma}$ and tumor necrosis factor-${\alpha}$ in response to subclinical mastitis in indigenous cattle breed Kankrej (n = 6), Gir (Bos indicus) (n = 12) and crossbred (Bos taurus${\times}$Bos indicus) (n = 7) were investigated using quantitative real time PCR. Significant correlation (p < 0.05) was observed between total bacterial load and somatic cell count (SCC) in all three breeds of cattle. All the cytokines were observed to be up-regulated compared to cows with healthy quarters, however, level of their expression varied among three breeds of cattle. In Kankrej most cytokines were found to be transcribed to higher levels than in other two breeds; the milk had higher load of bacteria but not so high SCC, implying that Kankrej has a higher inherent resistance against mastitis. The results of present study indicated that mammary glands of crossbred cattle are more sensitive to bacterial infection than indigenous breed of cattle as they elicit immune response at lower bacterial load and result into higher SCC. Research on identification of factors responsible for differentially expressed cytokines profiles and use of cytokines as immunomodulatory tools can pave way for formulating control strategies against bovine mastitis.