• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.549-552
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• 2005

Multiple wireless devices in wired and wireless heterogeneous networks communicate with counterparts via a single access point (AP). In this case, the AP becomes a bottleneck of the network, therefore buffer overflows occur frequently and result in TCP performance degradation. In this paper, a new algorithm that prevents buffer overflows at AP and enhances TCP fairness is proposed. Depending on the buffer usage of AP, the new algorithm adaptively controls each TCP senders' transmission rate, prevents buffer overflows and thus guarantees improved TCP fairness. It is proved that the algorithm makes better of TCP throughput and fairness by preventing buffer overflows.

• The Transactions of the Korea Information Processing Society
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• v.5 no.3
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• pp.606-619
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• 1998

In this paper, we have tfesigned and ihlplemented ACE(Application sharing Collaboration Engine) which is pessible an application sharing to collaborate among peoples who are geographically dispersed. The application sharing is a technology whereby two or more users collaborate to share the output of single application running on one computer system to the other users, and to provide input to the applications. We defined ASO(Applicatio!1 Sharing Object) object and its behavior to share applications in real time and ACE processes a sharing using ASO object among the distributed systems. ASO is classified into activateASO, updateASO, inputASO, and controlASO. The each ASO's behavior involves both events which occur at specific moments such as keystrokes and mouse clicks and more persistent status which can be observed at any time such as the image on the screen. The implemented ACE can be applied to the data conferencing, distance education, and project collaboration for engineer in distributed environments.

• Journal of Information Management
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• v.43 no.1
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• pp.89-108
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• 2012

Deeper understandings of school library-assisted instruction from teachers are required to develop students' self-directed learning skills which can improve their learning capabilities, problem solving techniques and learning attitudes. The objective of this study was to examine whether there is difference in subject teachers' perception of the necessity and effectiveness of the group type, class model, and collaborative class of class utilizing the school library and to apply and activate class utilizing the school library constructively in the field of education. For this purpose, this study inquired into the concept, necessity, type and process of class utilizing the school library, etc. and conducted a questionnaire survey of 278 subject teachers sampled from 30 high schools in 10 areas of Gyeonggido.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.11
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• pp.2100-2106
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• 2016

The automation system uses PLC to monitor the manufacturing process status of the production product and processes the sensor information transmitted from the sensor. In this paper, we propose a remote surveillance system to monitor the status of control relay used in automation system. The proposed system consists of a control relay module, a one-chip processor module, a computer monitoring system, and a database system that inputs and manages the details of the control relay. The computer monitoring system is configured to monitor the operating condition and life time of the control relay. The database is configured so that the input date of the control relay can be input and corrected, and the operating state information of the control relay can be automatically printed. In the remote monitoring system, the failure status of the control relay is recognized in real time, and the time required for normal operation can be minimized by quickly replacing faulty parts.

• Journal of Intelligence and Information Systems
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• v.11 no.2
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• pp.105-121
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• 2005

To realize a ubiquitous logistics management system using the smart object of Electronic Product Code(EPC) enabled RFID tag, the design and management of RFID Information Service is very important. RFID Information Service searches, transfers and responds to the other's PML request, but Physical Markup Language (PML) data management between trading system elements has issues of standardization of PML data description and processing, and problems of data traffic and communication time overload because of the innate distributed characteristics. As a complementary study, this research analyzes the usage patterns and data types of PML. On that analysis we provide a design of the distributed RFID Information Service architecture of PML data management that is using DB middleware. Standalone and Integrated type of RFID IS were proposed.

• Applied Chemistry for Engineering
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• v.23 no.2
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• pp.153-156
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• 2012

In this study, two different methods were studied to prepare Pt-Pd catalysts for direct methanol fuel cells in order to enhance the electrochemical efficiency. The catalysts were compared with simultaneously deposited Pt-Pd and sequentially deposited Pt-Pd. The electrocatalysts contained 20 wt% of metal loading on carbon black and 1 : 2 of Pt : Pd atomic ratio. Electrochemical properties of the catalysts were compared by measuring cyclic voltammetries and average sizes and lattice parameters were measured by transmission electron microscopy images and x-ray diffraction. As a result, sequentially deposited Pt-Pd/C catalysts showed better electrochemical properties than those of simultaneously deposited Pt-Pd/C catalysts.

• Food Science of Animal Resources
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• v.27 no.4
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• pp.538-542
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• 2007

This study was carried out to investigate the toxicity of exopolysaccharides (EPS) from kefir toward MA104 cells and evaluate the inhibitory effects of kefir EPS on rotavirus infection. The results obtained are summarized as follows: Lactic acid bacteria (Lactobacillus fermentum, L. acidophilus, L. brevis) and yeasts (Candida kefyr, Cryptococcus albidus, Pichia ohmeri) were isolated and identified from kefir grain and culture. At 1% EPS, the inhibitory effects of EPS on the infection of MA-104 cells using the MTT assay were $72.52{\pm}6.48%$ for human rotavirus (KU), $36.06{\pm}7.63%$ for bovine rotavirus (NCDV), and $81.66{\pm}1.11%$ for porcine rotavirus (OSU). At 1/128% EPS, the effects were $24.98{\pm}4.58%$ for human rotavirus (KU), $4.71{\pm}6.16%$ for bovine rotavirus (NCDV), and $4.05{\pm}14.90%$ forporcine rotavirus (OSU). EPS isolated from kefir have inhibitory effects on rotaviruses of various serotypes and rotaviruses from different animals.

• Journal of Information Management
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• v.34 no.3
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• pp.21-39
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• 2003

This study aims to evaluate the quality of Bibliographic database : The Union Catalog system(UNICAT) and Korean Library Information System Network(KOLIS-NET). The seven criteria(Coverage, Accuracy, Completeness, Currentness, Consistency on the quality of data itself and easy of use, Customer Support on the quality of database service) are used to measure their quality. The purpose of this study was dignose the quality of two bibliographic database mentioned above and analyses the measured result of quality comparatively and to find out the problems of them and also to provide possible suggestion for their improvements.

• Journal of Convergence for Information Technology
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• v.7 no.2
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• pp.111-117
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• 2017

Background/Objectives: The purpose of this study is to investigate the effects of eating habits and self-efficacy on health promotion behavior and to improve the quality of life in each life cycle. Methods/Statistical analysis: This study is a narrative research study for nursing students at university B in C city. The data were analyzed by SPSSWIN 18.0, t-test, ANOVA and bonferroni post test, Pearson correlation coefficient calculation and multiple regression analysis. Findings: Health promotion behaviors were positively correlated with eating habits and self-efficacy. Multiple regression analysis showed that 53.8% of the parents, caregivers, health status, eating habits, and self - efficacy of the nursing students showed the health promotion behaviors of the nursing students. The higher the self-efficacy(t=6.06, p<.001), the better the health-promoting behaviors(t=3.28, p=.001). Application/mprovements: Development of programs for strengthening health education and self-efficacy is required for proper eating habits and health promotion.

• Journal of Convergence for Information Technology
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• v.9 no.12
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• pp.71-80
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• 2019

This study is a descriptive research study to identify osteoporosis knowledge and osteoporosis prevention activities among care providers in nursing home. The subjects were 142 care providers in S and Y city. The Data were collected from July 1 to July 20, 2019, and analyzed SPSS 24.0 Version. The result showed that the osteoporosis knowledge of among care providers was moderate. It showed differences in educational status, osteoporosis management training experience, residents number and importance awareness of elderly bone health. And prevention activities differed according to osteoporosis management training experience and importance awareness of elderly bone health. There was a positive correlation between knowledge and prevention activities of osteoporosis. Therefore, it is necessary to develop education programs for the management of elderly osteoporosis and to raise importance awareness of elderly bone health among care providers in nursing home. Further studies are needed to evaluate the effects of the program.