• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.478-487
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• 1996

A " plucking rolls device" was developed in this study to improve the quality of harvested tea leaves. In this report, the outline of the system and the results of performance experiments in our laboratory are discussed. Tow kinds of performance experiments were carried out. The first experiment checked harvesting accuracy by using a plucking unit that was developed for harvesting machine installation. The second experiment was a harvesting experiment which utilized a fron bar in order to prevent cutting of the tea buds which had been a problem in precious experiments . As a results of the first experiments , it was confirmed that selective harvesting obtained high quality tea leaves. but a cutting problem that, when the harvesting seed was faster than the working speed, which was non-selective harvesting , was also seen. In the second experiment, the cutting rate decreased to a maximum of 50% level, when tea buds most bent ahead by the front bar. The effect was seen that cutt ng problem was alleviated from this.

• 품질경영학회지
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• 제20권2호
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• pp.94-108
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• 1992

This study involves an experiment for the cognitive experiment design and the human reliability in software engineering. Its overall objectives are to analyze common-cause human domain error and reliability in human-software interaction. A laboratory study was performed to analyze software engineers' task behavior in software production and to identify software design factors contributing to the effects in common cause failure redundancy. Common-cause model and its function were developed, then the main experiment using programming experts was conducted in order to define a new cognitive paradigm, in the aspects of identification, pattern recognition, and behavior domain for human reliability and quality control in software development. The results and analytical procedures developed in this research can be applied to reliability improvement and cost reduction in software development for many applications. Results are also expected to provide guidelines for software engineering quality control and for more effective design of human-software interface system.

• 설비공학논문집
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• 제16권2호
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• pp.128-134
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• 2004

In order to verify and take measures against a variety of troubles which cannot be predicted in a well-controlled laboratory, it is necessary that solar system should be experimented in an actual situation during a long period. Through this experiment it can be also understood how the load pattern and operational conditions expected in a design process become different to those in the actual running, which can be applied to a new system design. We installed 6 kW solar hot water heating system with a shower facility and operated during 7 months. As a result, average 8.3 persons took a shower a day； solar fraction is 71％ and total collector efficiency is 40％ during the periods from March to September. We confirmed several troubles encountered in the actual situation and considered practical center-measures.

• 한국식품위생안전성학회지
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• 제27권2호
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• pp.188-193
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• 2012

본 연구는 SD 계통의 랫드에서 국화 염료인 백색국화, 백색국화 잎과 줄기, 황색국화의 급성경구독성 및 피부자극성을 평가하기 위해서 시행하였다. 수컷 랫드에 처치한 물질은 백색국화, 백색국화 잎과 줄기, 황색국화를 각각 1 ml/kg, 2 ml/kg를 D.W에 용해시켜 단회 경구 투여하였으며, 수컷 SD rats에 투여 후 14일 동안 관찰하였으며, 피부자극성 시험은 피부의 찰과 및 비찰과부의 대조부, 처치부에 국화 염료를 처치하여 3일 동안 관찰하였다. 단회 경구 투여 및 피부 자극성 시험 후 국화 염료의 안전성을 확인하기 위해 체중과 사료 섭취량, 임상증상, 안과학적 검사, 사망률, 피부자극성을 관찰하고, 랫드 피부에서의 병리조직학적 변화를 관찰하였다. 체중, 사료섭취량, 병리조직학적 변화가 대조군과 비교시 유의적인 변화가 나타나지 않았다. 또한 피부자극성을 확인 한 결과 1차 자극 지수가 0으로 비자극성 물질로 분류되었다. 따라서 본 연구를 통하여 국화에서 추출한 염료가 급성 경구독성 시 안전한 물질이며, 피부 자극성을 야기 하지않는 물질로 평가된다.

• 공학교육연구
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• 제10권3호
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• pp.79-92
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• 2007

본 연구에서는 학습과정에 우수성, 유효성, 그리고 경제적인 효율성을 향상시키기 위해 웹기반 가상실험실과 웹기반 원격실험실을 적절하게 통합한 하이브리드 공학실험시스템을 개발하였다. 먼저 클라이언트/서버 분산환경을 설계하여 디지털 시스템과 전기전자회로 실험에 대한 웹기반 가상실험시스템을 개발하였다. 제안된 가상실험시스템은 개념학습세션, 가상실험세션, 평가세션등의 3개의 주요한 세션과 이들 주요세션을 유기적으로 통합하여 학습효율의 극대화를 달성하기 위한 관리시스템으로 구성되어 있다. 다음으로 본 연구에서는 가상실험세션 동안에 발생할 수 있는 현실감의 부족을 해결하기 위해 전기/전자회로를 실험할 수 있는 웹기반 원격 실험실을 구현하였다. 더욱이 간결하고 사용자가 친근하게 접근할 수 있는 설계기법을 사용하였기 때문에 많은 사용자들이 쉽게 원격실험실에 접속할 수 있으며, 고가의 실험장비가 실제 실험실에 구비되어 있지 않더라도 자기주도의 심화학습이 가능하다. 제안된 가상/원격실험시스템은 독립적으로 사용될 수도 있으나 학습효율을 향상시키기 위해서 웹상에서 두 개의 시스템을 통합하여 하이브리드 공학실험시스템을 개발하였다. 제안된 하이브리드 공학실험시스템은 학습자들에게 상호작용적인 학습환경을 제공하여 공학실험교육을 효율적으로 관리하는 새로운 접근방식이다.

• Asian-Australasian Journal of Animal Sciences
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• 제19권9호
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• pp.1314-1321
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• 2006

The objective of this work was to study the effect of mixed culture solid substrate fermentation of C. tropicalis ZD-3 with A. niger ZD-8 on detoxification of cottonseed meal (CSM), and to investigate the effect of fermentation period, proportion of CSM in substrate, sodium carbonate, minerals and heat treatment on the reduction of free gossypol levels during mixed culture solid substrate fermentation of CSM. Experiment 1: Three groups of disinfected CSM substrate were incubated for 48 h after inoculation with either of the fungi C. tropicalis ZD-3, A. niger ZD-8 or mixed culture (C. tropicalis ZD-3 with A. niger ZD-8). One non-inoculated group was used as the control. Levels of initial and final free gossypol (FG), CP and in vitro CP digestibility were assayed. The results indicated that mixed culture fermentation was far more effective than single strain fermentation, which not only had higher detoxification rate, but also had higher CP content and in vitro digestibility. Experiment 2: CSM substrates were treated according to experimental variables including fermentation period, proportion of CSM in substrate, sodium carbonate, minerals and heat treatment, Then, the treated CSM substrates were inoculated with mixed culture (C. tropicalis ZD-3 with A. niger ZD-8) and incubated at $30^{\circ}C$ for 36 h in a 95% relative humidity chamber. After fermentation ended, FG and CP content of fermented CSM substrate was assayed. The results showed that the appropriate fermentation period was 36 h, and the optimal proportion of CSM in substrate was 70%. Addition of sodium carbonate to CSM substrate was beneficial for fermentative detoxification. Heat treatment could facilitate fermentative detoxification, and supplementation with minerals was instrumental in reducing gossypol levels during mixed culture solid substrate fermentation of CSM.

• Asian-Australasian Journal of Animal Sciences
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• 제24권7호
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• pp.889-897
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• 2011

Mycoplasma Pneumonia of swine (MPS) decreases the daily growth of pigs, and, co-infection with a virus sometimes causes severe pneumonia. Genetic selection of pigs resistant to the pulmonary MPS lesion might solve the economic loss due to MPS in animal production. Here, we examined the immunophenotype of Landrace line (Miyagino L2), genetically selected to reduce the incidence of pulmonary MPS lesion for 5 generations in Miyagi Prefecture Animal Industry Experiment Station. Although this line is expected to be resistant to the pulmonary MPS lesion, the biological characteristics of its immune function are not clear. We investigated details of the immunorelated phenotype of Miyagino L2 at the hematological and molecular biological level, including cytokine expression, and compared the results with that of non-genetically selected Landrace. Miyagino L2 showed decreased antigen-specific IgG and IgM production and increased CD8-positive T-cell population, and high levels of cortisol concentration, suggesting that the MPS-resistant phenotype is associated these immunological differences. Additionally, T-cell CD4 expression was highly correlated with the MPS expected breeding value. Although the detailed mechanisms underlying this high correlation remain unknown, our result suggested that the genetic selection of the expression level of CD4 might be useful to improve MPS resistance in pig production.

• 한국전기전자재료학회논문지
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• 제23권10호
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• pp.798-803
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• 2010

This paper describes the characteristics of electromagnetic wave propagation in power transformer. A transformer which is similar to 154 kV single phase on-site transformer unit was provided for the purpose of the experiment. The 12 dielectric windows on the transformer enclosure to install UHF (ultra high frequency) sensors and the full scale mock ups of winding and the core were also equipped in the transformer. Every sensors to be installed to the transformer was tested and verified whether they show same characteristics or not before the experiment. A discharge gap which was used as a PD (partial discharge) source moved to several necessary locations in the transformer to simulate dielectric defects. Propagation times of electromagnetic wave signal from PD source to sensors decided by the routes of both reflection phenomenon and diffraction phenomenon were compared each other. The experimental results showed propagation route of the PD signal makes an effect on the frequency spectrum of front part of the signal and the magnitude of the signal and propagation time of the signal when the signal is captured on the sensor.

• Asian-Australasian Journal of Animal Sciences
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• 제31권4호
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• pp.569-575
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• 2018

Objective: This experiment was conducted to investigate the effects of chromium picolinate (CrP) on fat deposition, genetic expression and enzymatic activity of lipid metabolism-related enzymes. Methods: Two hundred forty one-day-old Ross broilers were randomly divided into 5 groups with 4 replicates per group and 12 Ross broiler chicks per replicate. The normal control group was fed a basal diet, and the other groups fed the same basal diet supplemented with 0.1, 0.2, 0.4, and 0.8 mg/kg CrP respectively. The experiment lasted for 21 days. Results: Added CrP in the basal diet decreased the abdominal fat, had no effects on subcutaneous fat thickness and inter-muscular fat width; 0.2 mg/kg CrP significantly decreased the fatty acid synthase (FAS) enzymatic (p<0.05); acetyl-CoA carboxylase (ACC) enzymatic activity decreased in all CrP groups (p<0.05); hormone-sensitive lipase (HSL) enzymatic activity also decreased, but the change was not significant (p>0.05); 0.4 mg/kg CrP group significantly decreased the lipoprotein lipase (LPL) enzymatic activity. FAS mRNA expression increased in all experimental groups, and the LPL mRNA expression significantly increased in all experimental groups (p<0.05), but not 0.2 mg/kg CrP group. Conclusion: The results indicated that adding CrP in basal diet decreased the abdominal fat percentage, had no effects on subcutaneous fat thickness and inter-muscular fat width, decreased the enzymatic activity of FAS, ACC, LPL and HSL and increased the genetic expression levels of FAS and LPL.

• 대한임상검사과학회지
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• 제36권2호
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• pp.245-251
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• 2004

This study was experiment on the safety of rat(Sprague-Dawley) exposed to natural herb oil(BM-solution). BM-solution was administered by inhalation to rats with the dose level of low(30 mg/8 min), middle(30 mg/4 min) and high(50 mg/4 min) in an airtight room for 4 weeks, respectively. Each groups, consisting of 5 rats, was examined for body weight changes, hematological analysis, serum biochemical analysis, organ weight, and histopathological findings, respectively. There were, dose-dependently, no changes of body weight and organ weights, no hematological anomalousness, and no other serum biochemical abnormality from the experiments. In addition, BM-solution was shown to have no specific toxicity by gross and histopathological findings. Therefore, it was concluded that BM-solution had no side effects on rats for 4 weeks.