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곽태수,양재훈,김성동,Gwak, Tae-Su,Yang, Jae-Hun,Kim, Seong-Dong 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.9
The wash-fastness of dyed polyester filament fabric was investigated using disperse dyes having different chromophores such as azo, anthraquinone, and benzodifuranone. The most important factors agnting the wash-fastness were fond to be the hydrophilicity and size of Planar region of disperse dye. The dye Possessed high hydrophilicity, which could be calculated by inorganic-organic-balance, showed Poor wash-fastness. The disperse dye having large planar region in molecular structure, for example the dye derived from benzodifuranone, showed extraordinarily high wash-fastness. The condition of washing test was also an important factor because it might change the degree of wash-fastness according to its severity.
유동방향과 밀도이방성 분석을 위한 세라믹 분말사출성형 해석
곽태수,서원선,Kwak, Tae-Soo,Seo, Won-Seon 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3
This study has focused on manufacturing technique of powder injection molding of watch case made from zirconia powder. A series of computer simulation process was applied to prediction of the flow pattern in the inside of the mould to clarifying the change of sintering shrinkage depended on flow direction. The material properties of melted feedstock inclusive of the PVT graph and thermal viscosity flowage properties were measured for obtaining the input data in computer simulation. Also, molding experiment was conducted and the results of experiment showed that good agreement with simulation results for flow pattern and weld line location. On the other hand, gravity and inertia effect have an influence on velocity of melt front because of high density of ceramic powder particles in powder injection molding against the polymer injection molding process. In the experiment, the position of melt front was compared with upper gate and lower gate position. The gravity and inertia effect could be confirmed in the experimental results.
eDNA 포집용 채수 필터시스템 개발과 집수매거 취수지 내에서의 성능평가
곽태수,김원석,이선호,곽인실 한국하천호수학회 2021 생태와 환경 Vol.54 No.4
A pump-type eDNA filtering system that can control voltage and hydraulic pressure respectively has been developed, and applied a filter case that can filter out without damaging the filter. The filtering performance of the developed system was evaluated by comparing the eDNA concentration with the conventional vacuum-pressured filtering method at the catchment conduit intake reservoir. The developed system was divided into a voltage control (manual pump system) method and a pressure control (automatic pump system) method, and the pressure was measured during filtering and the pressure change of each system was compared. The voltage control method started with 65 [KPa] at the beginning of the filtering, and as the filtering time elapsed, the amount of filtrate accumulated in the filter increased, so the pressure gradually increased. As a result of controlling the pressure control method to maintain a constant pressure according to the designed algorithm, there was a difference in the width of the hydraulic pressure fluctuation during the filtering process according to the feedback time of the hydraulic pressure sensor, and it was confirmed that the pressure was converged to the target pressure. The filtering performance of the developed system was confirmed by measuring the eDNA concentration and comparing the voltage control method and the hydraulic control method with the control group. The voltage control method obtained similar results to the control group, but the hydraulic control method showed lower results than the control group. It is considered that the low eDNA concentration in the hydraulic control method is due to the large pressure deviation during filtering and maintaining a constant pressure during the filtering process. Therefore, rather than maintaining a constant pressure during filtering, it was confirmed that a voltage control method in which the pressure is gradually increased as the filtrate increases with the lapse of filtering time is suitable for collecting eDNA. As a result of comparing the average concentration of eDNA in lentic zone and lotic zone as a control group, it was found to be 96.2 [ng µL-1 ] and 88.4 [ng µL-1 l], respectively. The result of comparing the average concentration of eDNA by the pump method was also high in the lentic zone sample as 90.7 [ng µL-1 ] and 74.8 [ng µL-1 ] in the lentic zone and the lotic zone, respectively. The high eDNA concentration in the lentic zone is thought to be due to the influence of microorganisms including the remaining eDNA.
곽태수,Kwak, Tae-Soo 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.1
This study has been focused on properties of mirror surface grinding technology by ELID(Electrolytic In-process Dressing) for metal matrix ceramic composites using in high precision mirror for optics. The experimental studies have been carried out to get mirror surface by grinding for composites, Al-SiC, Al-graphite and Mg-SiC. Grinding process is carried out with varying abrasive mesh type, depth of cut and feed rate using diamond wheel. The machining result of the surface roughness and condition of ground surface, have been analyzed by use of surface roughness tester and SEM measurement system. ELID grinding technology could be applied successfully for the mirror-surface manufacturing processes in spite of ductility of metal matrix material. As the results of experiments, surface roughness of Al-SiC(45 wt%) has been the most superior in these experimental work-pieces as 0.021 ${\mu}m$ Ra.
자성연마슬러리를 이용한 초미립 초경합금(WC-Co 18%)의 나노급 경면가공 특성
곽태수,Kwak, Tae-Soo 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
This study has been focused on an effective surface finishing method combining ELID (ELectrolytic In-process Dressing) and MAP (Magnetic Assisted Polishing) for the nano-precision mirror grinding of glass-lens molding mould. ELID grinding is an excellent technique for mirror grinding of various advanced metallic or nonmetallic materials. A polishing process is also required for elimination of scratches present on ELID grinded surfaces. MAP has been used as polishing method due to its high polishing efficiency and superior surface quality. It also presents some techniques for achieving the nanometer roughness of the hard material such as WC-Co, which are extensively used in precision tooling material.
ELID 연삭 모니터링 시스템의 개발과 구조 세라믹스 적용 사례
곽태수(Tae-Soo Kwak),김경년(Gyung-Nyun Kim),곽인실(Ihn-Sil Kwak) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.12
This study has focused on development of ELID monitoring system and its application to ELID grinding of structural ceramics. ELID monitoring system was consisted of grinding equipment, ELID power supply, grinding wheel, electrode and monitoring program. It can give a real time data to check spindle grinding resistance, wheel revolution, dressing current and voltage in ELID grinding process. The performance of developed system was evaluated by applying to grinding of structural ceramics, silicon carbide and alumina. As the results of experiments, monitored data for spindle resistance and ELID dressing current was useful to check steady-state ELID grinding process. From the comparison of spindle resistance between ELID grinding and conventional grinding process according to change of depth of cut, it could be confirmed that the spindle resistance in ELID grinding was lower than conventional grinding process.