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환경친화적인 무기/유기 Core-Shell의 제조에 관한 연구
설수덕,임재길,임종민,권재범,이내우 한국안전학회 2004 한국안전학회지 Vol.19 No.1
Composite particles using inorganic and organic chemicals were synthesized and the results of those reaction were compared to variation of temperature and agitation speed in presence of CaCO₃ which was adsorbed SDBS. Also the synthesises were optimized according to conversion rate of composite particles. In inorganic/organic core-shell composite particle polymerization, CaCO₃ adsorbed by 0.5wt% surfactant SDBS was prepared initially and then core CaCO₃ was encapsulated by sequential emulsion polymerization using MMA at the addition of APS 3.16X 10^(-3)mo1/L to minimize the coagulated PMMA particle itself during MMA shell polymerization. Encapsulated PMMA on CaCO₃ as inorganic/organic core-shell particles was verified by Fr-IR and DSC analysis. It was found that the CaCO₃ was very well encapsulated by PMMA as shell. The surfaces were distinctly found as spindle shape and broad particle distribution after capsulation.
임종민,하선희,임재길,설수덕 東亞大學校 大學院 2004 大學院論文集 Vol.29 No.-
Styrene-Acrylonitrile-Ethylacrylate-N-Methyloacryamide Prepared by emulsion polymerization has broad applications for additives such as paint binder, adhesive for wood and paper due to its low glass transition temperature which help to plasticize substrate resins. Since emulsion polymerization has disadvantage that surfactant and ionic initiator degrade properties of the product polymer, Poly(St-EA-AN-NMA) was synthesized using ammonium persulfate(APS) as catalyst and sodium lauryl sulfate(SLS) as emulsion to prevent the degradation. The copolymer binder product was internally plasticized and has enhanced colloid stability, adhesion, tensile strength and elongation. During binder emulsion polymerization, no coagulation and complete conversion occur with the reactant mixture of 3.34wt%/monomer ammonium persulfate, 2.33wt%/monomer sodium lauryl sulfate, and the balanced monomer that the weight ratio of Styrene, Ethylacrylate, Acrylonitrile are 47wt%/monomer, 32wt%/monomer, 6.4wt%/monomer. The activation energies for 37, 42, 47, 52% Styrene content were checked as 28.1~36kcal/mol by Kissinger's method. Actually, reasonable solid content could be considered as 56% because of activation energy and adhesive characteristics.
류길수(Keel-soo Rhyu),박상우(Sang-woo Park),김달현(Dal-hyun Kim),박종일(Jong-il Park),정철민(Cheol-min Jeong) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
LD(Ladder Diagram) is one of PLC programming language provided in IEC 61131-3 standard, is used most widely. PLC is logic language to operate only in private hardware. Nowadays with the development of hardware, many study is being carried about to operate SoftPLC type to be included in PLC for samely functions. In this study, we are discussing about GUI implementation of LD logic editor for development tool for SoftPLC using LD. We define a new language is called LDI(Ladder Diagram Instruction) to save LD to a file.
Communication Redundancy for Reliability Improvement in an Industrial Monitoring and Control System
Rhyu, Keel-Soo,Chung, Kyung-Yul The Korean Society of Marine Engineering 2004 한국마린엔지니어링학회지 Vol.28 No.8
In development of monitoring and control systems, one of the most important points is to consider a redundancy so that the system can be operated normally although hardware faults are partly occurred. The purpose of this paper is to introduce a monitoring and control system with a redundancy function for I/O servers and communication networks. I/O servers composed with an active server and a standby server. Each server also has 3 communication ports, 2 ports of them were connected to field units and the other 1 port was connected to the other server. Field units have to be constructed to 2 communication ports connected I/O servers through communication lines. Also, server communication module was implemented for analyzing and handling fault elements. and was submodularized for linking easily with a monitoring and control module. An experiment with 2 servers and 2 field units was constructed to demonstrate its effectiveness.
감시제어 시스템의 신뢰성 향상을 위한 서버 및 네트워크 이중화
류길수(Keel-Soo Rhyu),윤병수(Byung-Soo Youn),임대근(Dae-Kwen Lim) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
Recently, together with development of communications technology, monitoring and control systems have been used in many fields. When monitoring and control systems are developed, one of important things is considered about a redundancy whenever hardware faults are occurred partly.<br/> In this paper, we introduce a monitoring and control system with a redundancy function for servers and networks. The system, therefore, has an active server and standby server. In fields. all field units have to be constructed 2 communication ports connected each server through communication lines. Also. each server's communication program is implemented by analyzing and handling fault elements, and is modularized for linking easily with a monitoring and control module. An experiment with 2 servers and 2 field units is constructed to demonstrate its effectiveness.<br/>
류길수(Keel-soo Rhyu),박상우(Sang-woo Park),김달현(Dal-hyun Kim),박종일(Jong-il Park),정철민(Cheol-min Jeong) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
In this paper, we suggest the compiler implementation of a LD logic editor. The compiler load the LDI(Ladder Diagram Instruction) file saved by LD logic editor and analyze the lexicon and sentence to detect errors and convert to IL(Instruction List) of IEC 61131-3 standard. The converted IL is translated to binary code and the compiler generate the executable binary formed file to execute in SoftPLC.
A study on flame interaction between methane/air and nitrogen-diluted hydrogen–air premixed flames
Ha, Ji Soo,Moon, Chang Woo,Park, Jeong,Kim, Jeong Soo,Kim, Tae Hyung,Park, Jong Ho,Yun, Jin Han,Keel, Sang In Elsevier 2010 International journal of hydrogen energy Vol.35 No.13
<P><B>Abstract</B></P><P>Numerical and experimental studies are conducted to grasp downstream interactions between premixed flames stratified with two different kinds of fuel mixture. The selected fuel mixtures are methane and a nitrogen-diluted hydrogen with composition of 30% H<SUB>2</SUB> + 70% N<SUB>2</SUB>. Extinction limits are determined for methane/air and (30% H<SUB>2</SUB> + 70% N<SUB>2</SUB>)/air over the entire range of mixture concentrations. These extinction limits are shown to be significantly modified due to the interaction such that a mixture much beyond the flammability limit can burn with the help of a stronger flame. The lean extinction limit shows both the slanted segments of lower and upper branches due to the strong interaction with Lewis numbers of deficient reactant less than unity, while the rich extinction limit has a square shape due to the weak interaction with Lewis numbers of deficient reactant larger than unity. The regimes of negative flame speed show an asymmetric aspect with a single wing shape. The negative flame always appears only when methane is weak. The extent of interaction depends on the separation distance between the flames, which are the functions of the mixtures’ concentrations, the strain rate, the Lewis numbers, and the preferential diffusions of the penetrated hydrogen from the nitrogen-diluted hydrogen flame. The important role of preferential diffusion effects of hydrogen in the flame interaction is also discussed.</P>
로 내 탈황을 위한 CaCO₃ 흡착제 입자의 분위기 기체와 체류 시간의 변화에 따른 특성
이강수(Kang Soo Lee),정재희(Jae Hee Jung),길상인(Sang In Keel),이형근(Hyung Keun Lee),김상수(Sang Soo Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.2
추가적인 챔버를 필요로 하지 않는 로 내 탈황 기술은 순산소 연소 기술에 적용 가능할 것으로 기대되어 많은 연구가 진행중이다. 이때, 수 나노부터 수십 마이크로미터의 넓은 사이즈 분포를 가지는 CaCO₃ 입자가 흡착제로써 사용된다. 본 연구에서는 순산소 연소 시스템을 모사하는 랩스케일의 실험 장치를 구축하였다. CaCO₃ 흡착제 입자는 1200℃로 설정된 고온 반응로에 각각 공기 분위기와 CO₂ 분위기에서 노출되게 된다. 이때 고온 반응로에서의 체류 시간을 0.33 ~ 1.46 초로 변화시켜 가면서 분석을 수행하였다. 흡착제 입자는 고온반응로의 전단과 후단에서 각각 포집되어 주사형 이동도 입자계수기, X-선 회절장치, 열중량 분석기, 주사전자현미경 등을 사용하여 정성적/정량적으로 분석하였다. 결과적으로, 고온 반응로에서의 체류 시간과 분위기 기체성분이 흡착제 입자의 하소 반응률, 반응 메커니즘 등에 영향을 미침을 확인하였다. The in-furnace desulfurization technique is applied to the O₂/CO₂ combustion system for the carbon capture and storage (CCS) process because this combustion system does not need an additional chamber for the desulfurization. CaCO₃ sorbent particles, which have a wide range in size from a few nanometers to several tens of micrometers, are used for this process. In this study, an experimental system which can simulate the O₂/CO₂ combustion system was developed. CaCO₃ sorbent particles were exposed to the high temperature reactor at 1200℃ with various residence times (0.33-1.46 s) in air and CO₂ atmospheric conditions, respectively. The sorbent particles were then sampled at the inlet and outlet of the reactor and analyzed qualitatively/quantitatively using SMPS, XRD, TGA, and SEM. The results showed that the residence time and atmospheric condition in a high temperature reactor can affect the characteristics of the CaCO₃ sorbent particles used in the in-furnace desulfurization technique, such as the calcination rate and reaction mechanism.