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다양한 분산제에 의한 AlN-Y<sub>2</sub>O<sub>3</sub> 혼합분말의 비수계 용매 중 분산특성
김신,방상우,황인준,윤상옥,신현호,Kim, Shin,Bang, Sang-Woo,Hwang, Injoon,Yoon, Sang-Ok,Shin, Hyunho 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.4
The dispersion characteristics of AlN-4.5 wt% $Y_2O_3$ powder mixture by various dispersants were investigated in ethanol and methyethly-ketone (MEK) solvents. In general, the cationic polymer dispersants demonstrated superior dispersion of the powder as compared to the non-ionic ester-type dispersants or anionic phosphate-ester-based ones. The dispersion performance of the cationic polymer dispersants was sensitive to the type of solvent. An anhydric maleic-acid-based graft copolymer dispersant, AFB-1521, demonstrated a very good dispersion capability in ethanol but exhibited a much inferior dispersion in MEK. On the other hand, the dispersion of the powder mixture was very good with a phosphate-ester-based block polymer dispersant, BYK-111, in MEK solvent, while dispersionwas much degraded in ethanol.
김지형,방상우,김영준,Kim, Ji Hyeong,Bang, Sang U,Kim, Yeong Jun Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.9
A study was done on the synthesis of new poly(arylene ether)s and poly(arylenesulfide) with rigid benzoxazole pendants using nucleophilic aromatic substitution reaction. As a new aromatic monomer, 1,4-bis(2-benzox-azolyl)-2,5-difluorobenzene [I] w as synthesized in three steps starting from 1,4-dibromo-2,5-difluorobenzene. A model reaction of difluoro monomer [I] with two equivalents of m-cresol or thiophenol in a typical ether con-densation reaction conditions gave very high yields ( > 93%) of the desired disubstituted product, suggesting the feasibility of polymer formation in these reaction system. Monomer[I] was polymerized with bisphenols and bisbenzenethiol in NMP using K2CO3 as base. The molecular weight of the resulting polymers, however,seemed relatively low according to their solution viscosity values ( ηinh = 0.15-0.29 dL/g). The poly(arylene ether)s were soluble in several common organic solvents including chloroform, pyridine and N,N'-dimethylfor-mamide. The poly(arylene sulfide) was, however, ony soluble in strong acids like sulfuric acid and trifluoro-acetic acid. The glass transition temperatures were found to be 175-215 $^{\circ}C.$ These polymers were stable up to 380-420 $^{\circ}C$ in both nitrogen and air, as determined by the temperature that a significant weight loss began to appear on TGA.
DC 용접기의 전극접촉직경과 최대순시발열율에 관한 실험곡선 실현
이상민(Sang-Min Lee),방상우(Sang-Woo Bang),임영도(Young-Do Im) 한국정보기술학회 2010 Proceedings of KIIT Conference Vol.2010 No.-
본 논문은 DC 저항 스폿 용접기에서 용접기의 성능을 평가할 수 있는 실험곡선을 위한 연구이다. 용접에 있어 우수한 용접 품질과 용접기의 성능을 높이기 위해 전극접촉직경과 최대순시발열율의 파라미터를 제시한다. 용접출력전류를 파리미터로 하여 용접횟수에 대한 전극접촉직경의 실험곡선과 용접타점의 순서를 파리미터로 하여 용접 출력전류에 대한 최대순시발열율의 실험곡선을 실험을 통하여 제시한다. This paper is study for assesment of welding from DC Resistance Spot Welder. For welding, to propose parameter of the contact diameter of electrodes and the Instantaneous Heating Rate(IHR) because improve welding quality and performance. In this study, the weld output current is used as a parameter to propose the experimental curve of (he electrode contact diameter on the number of welding points. In addition, the order of welding points is used as a parameter to propose the experimental curve of the maximum instantaneous heating rate on the welding output current for multiple welding points.
손용두(Yong Doo Son),방상우(Sang Woo Bang),손준익(Jun Ik Son),임영도(Young Do Lim) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
본 논문에서는 PSO-PID를 이용하여 시소 시스템의 균형을 위한 PID 위치 제어기를 설계하고자 한다. 시소시스템은(Seesaw System) 선박 및 항공 역학, 도립진자, 각종 분석, 로봇 시스템 등의 해석에 광범위하게 응용되는 시스템이자 현대 제어 시스템의 이론과 각종 응용문제를 취급할 수 있는 장치이다. 또한 비선형성이 강한 제어 대상이므로 시스템의 이해와 해석, 그리고 파라미터의 정확한 선정이 필수요소이다. 본 논문에서 사용할 시스템 제어 알고리즘으로는 간단하고 안정성이 보장된 PID 제어와 정확하고 빠른 PID 파라미터 동조에 필요한 연산 최적화 알고리즘인 PSO(Particle Swarm Optimization) 통해 외란이나 제어기의 변화에 빠르게 적응할 수 있도록 하여 성능과 안정성을 보장한다. In this paper, Position Controller for balance of Seesaw System design using PID Algorithm. Seesaw System is that it's system use widely to analyze of ship or flight dynamics, Inverted Pendulum and, Robot System, manage system for theory of modern control system and all sorts of analysis. In case of Seesaw System, it's necessity that understand and analysis of system and correct selection of parameter because the system is strong nonlinear control system. It guarantees efficiency and stability to adapt quickly for disturbance or change of controller from PID Algorithm of guarantee safe from simple and long history and PSO(Particle Swarm Optimization) that sort of metaheuristic optimization that need to accuracy and fast PID parameter tuning.