• KSCE Journal of Civil and Environmental Engineering Research
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• v.8 no.1
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• pp.33-40
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• 1988

The new technique has been used to determine the soil-reinforcement interaction. The testing apparatus is essentially a triaxial cell fitted with the capability to house a hollow cylinderical sample. A hollow cylinderical sand specimen with a concentrical layer of reinfarcing material sandwitched in the middle is used in this investigation. The reinforcement is fastened at the base. The hollow specimen can be viewed as a "unit sheet" of a soil-reinforcement composite system of infinite horizontal extent. Axial load as well as inner and outer chamber pressures can be applied to perform a test. The specimen is first subjected to an isotropic stress state corresponding to the overburden pressure. Next, an extension test by reducing the axial load is carried out. The specimen is "loaded" to failure by either the breakage of reinforcing material (tensile failure) or slippage which takes place at the soil-reinforcement interface (i.e. the overcoming of the bonding capacity). Since the reinforcement is fastened at its lower end to the base, any tendency of relative movement between the reinforcement and the sand during an extension test can induce tensile force in the reinforcement thus forming a "reversed pull-out" test condition. Preliminary test results have demonstrated positively of the new approach to test the soil-reinforcement interaction. Reinforcing elements of different extensibility were used to study the deformbility of reinforced soil. Furthermore, both the breakage and the pull-out modes of failure were observed.

• Journal of Korean society of Dental Hygiene
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• v.13 no.4
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• pp.631-637
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• 2013

Objectives : The aim of the study is to propose the fundamental data for further developments of the school dental clinic program through evaluating comprehensive improvements of the indices and the oral health status. Methods : This studied was carried out from December 2010 to September 2012. Subjects were 239 elementary school 4th, 5th, 6th grade students having no school dental clinic and 195 elementary school 4th, 5th, 6th grade students having school dental clinic in Busan. They completed self-reported questionnaires after accepting informed consent. The questionnaire included knowledges, attitudes and practices for oral health recognition and supports of the school dental clinic program. Results : Permanent tooth caries prevention rate revealed 59.0%, 53.3%, and 62.0%. in 4th, 5th, and 6th respectively. Rate of Care Group with fissure sealant permanent teeth showed 80.3%, 88.0%, and 88.9% respectively. Index of Care Group with fissure sealant permanent teeth revealed 2.68, 2.90, and 3.97, respectively. DMFT index of Care Group was 1.11, 1.35, and 1.51, respectively. Active D rate of Care Group resulted in 16.7%, 24.1%, and 16.7%, respectively. Dental health education group showed high awareness level of fluoride and sealant effect for caries prevention. Tooth brushing of three times per day was more effective when using rolling tooth brushing. On the other hand, oral health recognition and oral status in the control group was low. Conclusions : Oral health recognition was closely related to good oral care. Expansion of oral health care business is important to prevent dental caries. Systematic approach for oral health education programs and human resources development is very important to improve oral health care.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.35 no.6
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• pp.591-598
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• 2017

This study is for coordinates analysis(geocentric and rectangular coordinate) of Korean geodetic VLBI which has been operated by NGII (National Geographic Information Institute) in Republic of Korea since 2014. The purpose of this study is a fundamental research to determine the Korean geodetic datum. The VLBI data recorded from September 29th 2014 to July 31th 2017, total approximately a hundred of VLBI databases, is used to calculate daily positions and position rates. The VLBI coordinates are based on ITRF(2000,2005,2008,2014) with epochs of the first Korean VLBI observation date(September 29th 2014) and Korean Geodetic Datum(January 1st 2002). And as a results of VLBI observation, Korean VLBI coordinate movement velocity of 3.1cm/yr in the direction of $112.4^{\circ}$.

• Proceedings of The Korean Society of Health Promotion Conference
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• 2009.05a
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• pp.78-78
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• 2009

맑은 화성을 만들기 위하여 지역주민의 통제력을 강화시키고 금연을 지원하는 환경을 조성함으로써 흡연으로 인한 질병과 사망 및 간접흡연의 노출을 감소시키는 것을 목적으로 두고 있다. 미국 CDC에서 제안한 "Best Practices for Comprehensive Tobacco Control Program"에 기반한 중재 프로그램을 개발하여, 사업을 추진하였으며, 사업 추진체계를 금연환경, 금연교육 및 캠페인 운영관리 매뉴얼 개발, 금연프로그램, 감시 및 평가 5개 영역으로 구분되었다. 화성시보건소 금연사업은 매월 1일은 건강도시 화성시의 금연DAY로 지정함으로써 체계적이고 종합적인 금연홍보를 하고 있다. 어디서든 화성시 금연사업의 슬로건을 볼 수 있으며, 다양한 매체를 통하여 접해볼 수 있다 더구나 지역적 특성을 고려하여 권역별(서부권, 동부권, 남부권)의 특징을 살려 금연환경 조성 및 홍보, 이동클리닉을 하고 있으며, 환경조성으로 금연거리, 공원, 문화재, 마을, 선도학교 등을 지속적으로 관리중이며, 다양한 매체를 활용한 홍보, 생활 속 금연을 위한 대상별 캠페인 및 교육 등으로 화성시의 금연물결을 불고 있다. 감시 및 평가로 금연프로그램에 대한 평가를 설문을 통해 실시할 예정이며, 아동 및 청소년의 흡연특성을 조사하여 내년 사업 방향을 수립할 예정이다. 앞으로 담배연기 없는 맑은 화성시를 위하여 금연 버스 정류장과 금연아파트 및 금연 금연성공자 사례집 발간 등으로 슬로건을 앞세운 다양한 사업을 통하여 화성시의 금연율 향상 및 건강증진을 기대해본다.

• Microbiology and Biotechnology Letters
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• v.9 no.1
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• pp.45-50
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• 1981

The effect of growth and the carbon sources including the molar ratio of fructose to glucose was studied for the maximization of inosine-5'-monophosphate (5'-IMP) production from Brebibacterium ammoniagenes D-21530. According to experimental results, fructose was more efficient to 5'-IMP accumulation than glucose, while the latter was better for the cell growth than the former. To synchronously use glucose and fructose as carbon source is to optimally control the cell growth and maximum production of 5'-IMP without change of other conditions. The optimal weight percent of fructose to sum of glucose and fructose was 20～40%, and the productivity improvement over the utilization of fructose was about 40%. And also the optimality of purine base such as adenine and guanine were considered. The optimal concentrations of adenine and guanine were near 50㎎/l.

• The Transactions of the Korea Information Processing Society
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• v.3 no.4
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• pp.961-968
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• 1996

In the frame of Koreasat Project, it has been identified the task to implement a pilot satellite network module to provide LAN-to-LAn in ground system for satellite links. The pilot network will support an experiment to verify the performances of the considered applications through a satellite.This paper proposes a satellite-LAN interconnecting architecture making full use of satellite benefits and counteracting satellite demerits. The architectureprovides high quality data transmission and high perfrmance for satellite bit errors by using a connection- oriented satellite protocol which can establish multiple logical links between two nodes. As a protocol conversion method, router-type interconnection was selected to guard against problems. Based on this architecture, a satellite LAN interconnecting system has been designed, which includes a 1.8 meter antenna with a 4 watt transceiver, a satellite modem and the developed satellite network interface. The system can support high speed transmission rates of up to 1.544 Mbs and superior network management as well.

• The KIPS Transactions:PartC
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• v.15C no.5
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• pp.375-382
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• 2008

As the use of Internet and information communication technology is being generalized, the SSL protocol is essential in Internet because the important data should be transferred securely. While the SSL protocol is designed to defend from active attack such as message forgery and message alteration, the cipher suite setting can be easily modified. If the attacker draw on a malfunction of the client system and modify the cipher suite setting to the symmetric key algorithm which has short key length, he should eavesdrop and cryptanalysis the encrypt data. In this paper, we examine the domestic web site whether they generate the security session in the symmetric key algorithm which has short key length and propose the solution of the cipher suite setting problem.

• Journal of the Korea Convergence Society
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• v.6 no.4
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• pp.105-111
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• 2015

Most of the software development is determined by the hard skills of project participants and capacity management and operations. However, failure of the current software development is very high. Since the development of the exploration of human psychology continues, the study that there is an association between the preferences of personality and work preference has been actively conducted. It is found out that there is a relationship of preferences in MBTI, the test tool of psychological typology, and those for the work of the ICT engineers tuned to the software development cycle. By using the information on the soft skills associated with software development for the psychological typology, it can be understood the preference of the software development process. In this paper, we develop a program for software development process to allow personality type to be classified with using the soft skills to find ways to improve education and collaboration capabilities of ICT engineers.

• Journal of Korean Library and Information Science Society
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• v.42 no.4
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• pp.375-393
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• 2011

As small libraries are now considered as public libraries, it is time to discuss a policy decision for institutional complement, supporting policy frame, and activating management of small libraries. There is a need to improve statistical indicators of small libraries, as an effort to improve library statistics as a whole. Small libraries in National Library Statistics have been using an altered version of 2008 library statistiscal frame, which was solely designed for public libraries. However, due to the inadequacy of indicators, results show 91.3% of missing values and high rates of errors in collected data. This research select the key statistical indicators for small libraries by analyzing 4 researches of present states and 7 researches of measuring indicators. The research, therefore, proposed an improved version of statistical indicators, by advising of the professional groups in the small library statistics and estimation and investigating of 108 small libraries in GyeongGi-Do Area. There are 7 categories and 37 items in the proposed statistics.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.4
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• pp.778-784
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• 2012

A symmetric block cryptosystem uses an identical cryptographic key at encryption and decryption processes. HIGHT cipher algorithm is 64-bit block cryptographic technology for mobile device that was authorized as international standard by ISO/IEC on 2010. In this paper, block cipher HIGHT algorithm is designed using Verilog-HDL. Four modes of operation for block cipher such as ECB, CBC, OFB and CTR are supported. When continuous message blocks of fixed size are encrypted or decrypted, the desigend HIGHT core can process a 64-bit message block in every 34-clock cycle. The cryptographic processor designed in this paper operates at 144MHz on vertex chip of Xilinx, Inc. and the maximum throughput is 271Mbps. The designed cryptographic processor is applicable to security module of the areas such as PDA, smart card, internet banking and satellite broadcasting.