• Journal of Animal Environmental Science
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• v.17 no.2
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• pp.61-70
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• 2011

This survey was conducted to investigate the current situation of ground condition of barn, moisture condition, feeding facilities, disinfection tool, etc. The data from a total of 305 farms were collected and analysed for establishment of managemental target in Hanwoo farm. The ground condition of barn was evaluated as a result of "moderate level" (46.4%). The moisture removal on the ground was conducted with the aid of electric fan (36.4%). The natural wind and sunlight should be used gradually for economic effect in farm. The exchange of floor straw was mostly conducted to remove the bad smell of barn (33.7%). 37.0% of farms had no the electric fan in internal barn, this instrument must be installed for control of body temperature and internal moisture in the future. Most of feeding facilities were operated by hand(88.2%). Modern farms should be installed with automatic feeding system. Farmer's skill of management was evaluated as a "2.80" of 5 points. Accordingly, farmers should be trained with high level of technical competitive skill. In conclusion, Hanwoo farms should be promoted and improved for enhancement of income through introduction to scientifically modern feeding skill.

• Korean Journal of Food Science and Technology
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• v.27 no.6
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• pp.866-870
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• 1995

This study was conducted to determine the effect of soluble polysaccharides and indigestible polysaccharides on the digestibility of casein in vitro and the structure of polysaccharide. The digestibility of casein by trypsin in vitro was reduced to $80{\sim}89%$ and $69{\sim}99%$ by high molecular soluble polysaccharide (HMS-P) and low molecular insoluble polysaccharide (LMI-P) prepared from buckwheat, respectively. The digestibility of casein by chymotrypsin was reduced to $63{\sim}88%$ and$71{\sim}79%$ by HMS-P and LMI-P, respectively. But casein digestibiliy by trypsin and chymotrypsin was slightly reduced by LMS-P. The casein hydrolyzates inhibited by HMS-P gave a main peak in the void volume on Sepadex G-100, but the peak in the total volume was only appeared in case of LMS-P having no inhibito교 effect. It was suggested that the HMS-P was consisted of 4-linked and 4,6-dissubstituted glucose from the structural analysis by GC.

• Journal of the Korean Society for Railway
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• v.19 no.1
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• pp.38-45
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• 2016

The power transformation system of High Speed rolling stocks like KTX-Sancheon has shown excellent control capacities in the areas of riding comfortability, switching efficiency, safety and energy consumption due to technical developments in power-electronics, high speed & large scale integrated semiconductors and microprocessors. However, harmonics from IGBT, a high speed switching device used in the Convertor & Invertor equipment of rolling stocks have given rise to various problems in transformer substations, signaling systems, data transmission systems and facility monitoring systems. Especially, TI21 non-insulated track circuits have malfunctioned due to the influence of returning current harmonics which were generated at around of integer times of the number of power transformation equipment in the frequency domain. This paper, measures and analyzes various schemes to analyze the traveling path of the returning current harmonics generated due to the relationship between the rolling stocks and track circuits on site. Ultimately, theseschemes will be used to design high speed rolling stocks, AF track circuits and a common grounding network.

• Journal of the Korean Society for Railway
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• v.19 no.1
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• pp.29-37
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• 2016

The type approval system of the railway safety law, which was enforced in 2014, has been preferentially applied to the field of railway vehicles. The type approval system addresses railway vehicles and railway constituents. Unlike the previous system, it requires serial verification stages divided, in consecutive order, into verification of design compatibility and conformity and type test. These stages are in accord with international certification systems including TSI certification of the European commission. This study has been carried out to find and meet the design requirements for a coupler head, which is a part of the automatic coupler system; requirements were drawn from TSI and technical specifications that are subordinate to the domestic railway approval system. Through this study, it has been found that there exist 34 design requirements to acquire a complete coupler head. Among those requirements, 32 were verified by document inspection and two were able to be verified by performing FEA and gathering range analysis data.

• Journal of Korean Society of Environmental Engineers
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• v.39 no.1
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• pp.1-8
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• 2017

Drinking water deficiency is prevalent in developing countries due to contamination of surface and ground water, difficulties of water treatment, and lack of water infrastructures. 'Rainwater For Drinking (RFD)' projects are emerging as one of the effective solutions globally since RFD systems provide safe drinking water from rainwater. In RFD projects, perception of local residents toward RFD project is essential as local residents must manage their RFD systems on their own after the project finishes. This research performed survey and interview to 209 local residents, who use RFD systems, and analyzed their general perception, expected effects and feared factors toward RFD projects. Through the research, it was shown that the most of the local residents have positive perception towards RFD projects' effectiveness (41.9%) and are willing to participate (58.9%). The top three expected effect factors of the RFD projects were 'supply of safe water source', 'vitalization of local community', and 'expansion of RFD system'. The top three feared factors were 'quality of rainwater', 'technical factors of RFD system', and 'maintenance of RFD system'. The research findings indicate that development of simple water quality measuring device and education of the local residents about RFD system is necessary for better maintenance of the RFD system after the project finishes.

• Journal of the Korean Recycled Construction Resources Institute
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• v.2 no.1
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• pp.113-119
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• 2006

It is now established that more than two types of blended aggregate have beneficial effects on quality and supply of concrete in the long run. However, studies on blended aggregate have not widely been progressive and the evaluation method of its most favorable mixture proportion is still needed. Therefore this study investigated the most favorable mixture proportion through the physical experiment of fresh and hardened state's cement mortar, in response to three types of composite ratio, natural fine aggregate(Ns), crushed fine aggregate(Cs) and recycled fine aggregate(Rs). Test showed that increase of blending ratio of Ns and Cs improved fluidity of mot1ar. For the properties of compressive and flexural strength, mortar blending Ns and Cs properly, exhibited similar value to one using only Cs, while mortar mixing Rs showed lower strength value as less as 6% of control one. Mortar using only Rs exhibited the largest drying shrinkage value. In addition, even thought it is not a clear quantitative analysis, technical-imaging-skill presenting the most favorable mixture proportion 3-dimensionally is proposed in this research, in order to notify the proportion easily.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.5 no.4
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• pp.3-17
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• 1994

The error probability of QPSK and DPSK signals with diversity reception technique in m-distribution fading plus impulsive noise environments has been derived and the error probability is evaluated and compared with that in Gaussian noise environment. The error performance degrades as impulsive noise becomes strong and degree of degradation of signal performance in QDPSK signal is larger than that in QPSK signal. The diversity reception technique can improve the error performance not only in fading plus Gaussian noise environment but in fading plus impulsive noise environment. When diversity reception technique is used, the improvement of error performance attains about 10dB to 15dB in terms of CNR as compared with that in non diversity reception. Among diversity techniques the maximal ratio combining is must effective. When diversity reception and coding techniques are used together in impulsive noise plus Rayleigh fading environments, the improvement of error performance attains about 12dB to 15dB in terms of CNR as compared with that of only diversity reception technique case and the improvement of error perform- ance in RS coding attains about 2dB in terms of CNR as compared with that of BCH coding case.

• Spatial Information Research
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• v.23 no.2
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• pp.49-57
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• 2015

Recently, Through the linkage and opening, the fusion of the spatial information, it is necessary for productive ecosystem to provide a variety of information and to increase the civil use. Depending on the economic growth, demand for quality of life and well-being has been on the increase. Spatial information service contents for the public convenience has emerged to solve the problem such as health, safety, welfare and discomfort of daily life This study aims to implement search services for a tailored residence space through the three-dimensional data modeling on cadastral information. To achieve this goal, we established the requirements for deriving a registered object by investigating recent trend with respect to existing cadastral data model and defined property and relationship. Focusing on Songpa-gu, Jamsil station in Seoul, we implemented search services for a tailored residence space for three-dimensional right analysis in conjunction with residential and commercial complex building. As a result, we derived a way to supply 3D cadastre information through open platforms (VWorld) and to represent efficiently, which is able to improve the quality of spatial information service contents for the public convenience as well as to widen utilization of information.

• Information Systems Review
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• v.17 no.3
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• pp.1-17
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• 2015

Due to the constant expansion of overseas public IT market, exportation market mainly based on e-government is expanding and platform needs to be introduced urgently to systematically support it. Thus, this study was carried on to draw evaluation items and weighted value of tools to support decision-making out of services of public IT platform. In this study, the tools supporting decision-making were defined as concept that draws exportation customers by wholly considering 2 aspects of enterprise capabilities and national environment. To develop tools supporting decision-making, the items to evaluate the aspect of enterprise capabilities and national environment were drawn through study on literature and open question and evaluation items were eliminated and AHP analysis was done through question given to experts. As a result, the significance was found in the order of Export Competitive Advantage > Export Marketing Strategy > Export Human Resources > Export-Related Organizational Resources > Export-Related Organizational Capabilities in the aspect of enterprise capabilities. The significance of evaluation was found in the order of Service Market Efficiency > Technical innovation and Maturity > Institutions > Market Efficiency > Macroeconomic Environment > Infrastructure in the aspect of national environment.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.21 no.5
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• pp.117-132
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• 2022

The purpose of this study is to analyze factors that affect road users' acceptance of fully autonomous vehicles (level 4 or higher). A survey was done with drivers of general cars and pedestrians who share roads with fully autonomous vehicles. Five acceptability factors were selected: trust towards technology, compatibility, policy, perceived safety, and perceived usefulness. The effect on behavioral intention was analyzed using structural equation modeling (SEM). The perceived safety and trust towards technology were found to be very important in the acceptance of fully autonomous vehicles, regardless of the respondent, and policy was not influential. Compatibility and perceived usefulness were particularly influential factors for drivers. In order to improve the acceptance by road users, securing technical completeness of fully autonomous vehicles is important. Certification and evaluation of the safe driving ability of fully autonomous vehicles should be thoroughly performed, and based on the results, it is necessary to improve the perception by road users. It is necessary to positively recognize fully autonomous vehicles through education and publicity for road users and to support their smooth interaction.