• Korea Petroleum Association Journal
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• no.6 s.148
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• pp.104-110
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• 1993

• Magazine of the Korean Society of Agricultural Engineers
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• v.39 no.4
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• pp.82-89
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• 1997

A physically-based soil-water erosion model with simple hydrology and Rose & Hairsine's erosion concept is described, and was implemented in the form of computer program. The model derived from the concept of stream power(Bagnold, 1977) considers settling velocity characteristics of the soil and distinguishes between the processes of entrainment and re-entrainment. It deals separately with rill flow and sheet flow, handles vegetation in terms of soil contact cover, and has the ability to simulate soil movement on nonuniform slopes. The model predicted sediment concentrations reasonably with the results of Mclsaac et al. (1990). It showed a capability to quantitatively predict the movement of soil on uniform and nonuniform slopes. Among the model parameters, soil depositability $({\phi})$ was the most sensitive from the sensitivity analysis.

• The Magazine of the IEIE
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• v.31 no.3
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• pp.49-56
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• 2004

지금까지 end-to-end ethernet 서비스를 실현하기 위한 노력으로 10 Gbps 이상의 ethernet 전송기술, 강력한 보안프로토콜, 그리고 QoS 방안 등이 주가 되어 연구되고 논의되어져 왔다. 본 고에서는 기존의 asynchronous ethernet을 그대로 수용하며 기존 ethernet의 가장 큰 한계점으로 지적되었던 real-time data전송문제를 해결하기 위한 ‘Synchronous Ethernet’ 의 표준화 현황 및 기술을 소개하고자 한다. ‘Synchronous Ethernet’은 현재 공식적으로 정해진 표준이 없는 상태지만 2004년에 국제표준회의에서 새롭고 활발한 활동으로 자리잡을 것으로 보인다.(중략)

• Journal of the Korea Society of Computer and Information
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• v.7 no.4
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• pp.33-39
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• 2002

The present so many systems are used by evolution of Program to expel DNC(Direct Numerical Control) Network Infra for many CNC Controller. However, these systems is an inefficiency side in case of mutual connection at a long distance between Server Computer and Machining center Also, the machining center have so many controversial points in data transmission-receiver from the NC data server. So, this thesis well constructed the remote control system from CNC(Computer Numerical Control) Controller to CAD/CAM Server Computer. This system have some kinds of merits. Firstly. the machining center's user can easily use the saved NC data transmission from the CAD/CAM Server Secondly, the remote control is possible without the mutual conversation between the CAD/CAM Server and the machining center.

• Journal of the Korean Chemical Society
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• v.42 no.6
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• pp.672-678
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• 1998

Chitin was extracted from crab shell of Portuns triberculatus and deacethylated to yield chitosan with various molecular weights. The absorption and the fluorescence spectra of Rhodamine 6G(Rh 6G)-sodium dodecyl sulfate(SDS) and Rh 6G-chitosan systems were obtained. From the spectra, we observed that the absorption and the fluorescence intensity of Rh 6G-SDS system decreased when S/D(the concentration of SDS to that of Rh 6G ratio) was below or at 32, while they increased when S/D was above 32. From the suspended solid(SS) removal rate and the transmittance of Rh 6G-SDS-chitosan system, we found that when S/D ratio was 32 its flocculating behaviour was much stronger than Rh 6G-SDS system. As the concentration and the molecular weight of chitosan increased, we also found that S/D range was extended from 32 to 100. With increasing the molecular weight of chitosan, the SS removal rate increased around pH 2~9 but decreased remarkably at pH>12.