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이종국,김민정,노희진,배지수 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1
Yttria-stabilized zirconia granule powder was prepared by a spray drying method, and the compacted and sintered behaviors were investigated Optimum slurry was prepared by the mixing of 70 vol% zirconia powder and 30% water and milling for 15 h in zirconia jar The slurry was stabilized by the addition of binder(PEG 155%, PVA 05%), dispersant(Cerasperse) 06%, Antifoaming agent(SN Defoamer) 03%, and Lubricant(Lu-6418) 1%, and the viscosity of this slurry showed the 5 dPas The optimum condition for the spray-drying of yttria stabilized zirconia powder is the inlet temperature of 110℃, outlet temperature of 90℃, slurry feeding rate of 140cc/min , and atomizer speed of 9000 rpm.
ZVS를 이용한 SEPP 고주파 공진 인버터의 특성해석
김동희,노채균,김종해,민병재,배상준 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.1
Applied the high frequency switching technology to the ower conversion circuits, the turn on and off loss of switch point out practically large the point at issue, in order to reduce switching loss, the switching method using tank resonant circuit be connected serial and parallel with load have been continuously investigated. This paper was described about principle and form of proposed circuit made use of soft switching technology ZVS(Zero Voltage Switching) and ZCS(Zero Current Switching) to reduce turn on and off loss at switching. Also, the analysis of the proposed circuit is described generally by using normalized parameter and basic operating principle and driving characteristics have been evaluated as to switching frequency and load parameter. Based on the charactristics value, a method of circuit design is proposed. In addition, Pspice's simulation and experimental waveforms are compared with theoretical ones. The experimental results shows that the proposed Inverter can be used practically such as power source system for induction cooker etc.
양성렬,최기오,박종근,류문희,홍석노,김수한,안봉환,이제혁,이민화 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.4
Protective effects of human cerebrospinal fluid antioxidants against enzyme inactivation caused by metal-catalyzed oxidation systems were investigated. When purified glutamine synthetase(GS) was incubated with human cerebrospinal fluid(CSF), the enzyme was progressively inactivated. Catalase and EDTA could inhibit the enzyme inactivation by 50-80%. Small-molecular(Mr< -10,000) fraction of CSF inactivated the exogenous GS, but large-molecular(Mr> -10,000) fraction did not. The GS inactivation by the small-molecular fraction was also markedly inhibited by catalase and EDTA. These results suggested that metal-catalyzed oxidation is involved in the GS inactivation by the small-molecular fraction of CSF. Dithiothreitol(DTT) was shown to inhibit almost completely the oxidative inactivation of GS by CSF. However, DTT inhibited only partially the oxidative inactivation of GS caused by small-molecular fraction of CSF. When large-molecular fraction of CSF was separated by anion-exchange HPLC chromatogrpahy, there was a peak of antioxidant activity inhibiting the small-molecular fraction-induced GS inactivation in the presence of DTT. The antioxidant activity was neutralized by monoclonal antibodies to transthyretin. Purified transthyretin was found to efficiently inhibit ascorbate/Cu^(2+)-induced GS inactivation in the presence of DTT. Uric acid and glucose did not show any protective effect on the GS inactivation in the same condition. The above results suggest that metal-catalyzed oxidation occurs normally in human CSF, and that transthyretin may play an important role as a CSF antioxidant in protecting proteins from metal-catalyzed oxidation.
Development of Dual Resolution Visual System to Improve the Reproduced Visusal Acuity
Jong-Min Kim,Kwan-Sub Noh,Jong-Hak Lee 한국자동차공학회 2008 한국자동차공학회 Symposium Vol.2008 No.9
The driving simulator is known the good experiment tool to evaluate the road facilities. The visual system of driving simulator has the large screen to give more sense of reality. The large screen brings down the decrease of resolution; the outcome of experiment can not be applied on the field. This study’s aim is how much the dual resolution of visual system increases the reproduced visual acuity. The experiments were conducted through the visual acuity test in the real world as well as in the virtual world (high resolution, normal resolution). There is significant difference the reproduced visual acuity by the resolution of visual system, but no personal difference of visual acuity.
Disposable Solid-State pH Sensor Using Nanoporous Platinum and Copolyelectrolytic Junction
Noh, Jong-Min,Park, Se-Jin,Kim, Hee-Chan,Chung, Taek-Dong Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
A disposable solid-state pH sensor was realized by utilizing two nanoporous Pt (npPt) electrodes and a copolyelectrolytic junction. One nanoporous Pt electrode was to measure the pH as an indicating electrode (pH-IE) and the other assembled with copolyelectrolytic junction was to maintain constant open circuit potential ($E_{oc}$) as a solid-state reference electrode (SSRE). The copolyelectrolytic junction was composed of cationic and anionic polymers immobilized by photo-polymerization of N,N'-methylenebisacrylamide, making buffered electrolytic environment on the SSRE. It was expected to make. The nanoporous Pt surrounded by a constant pH excellently worked as a solid state reference electrode so as to stabilize the system within 30 s and retain the electrochemical environment regardless of unknown sample solutions. Combination between the SSRE and the pH-IE commonly based on nanoporous Pt yielded a complete solid-state pH sensor that requires no internal filling solution. The solid state pH sensing chip is simple and easy to fabricate so that it could be practically used for disposable purposes. Moreover, the solid-state pH sensor successfully functions in calibration-free mode in a variety of buffers and surfactant samples.
Park, Jong-Min,Noh, Joo-Yoon,Kim, Moon-Ju,Yun, Tae Gyeong,Lee, Sang-Guk,Chung, Kyung Soo,Lee, Eun Hye,Shin, Mi Hwa,Ku, Nam Su,Yoon, Sohee,Kang, Min-Jung,Park, Moo Suk,Pyun, Jae-Chul American Chemical Society 2019 ANALYTICAL CHEMISTRY - Vol.91 No.22
<P>In this work, medical diagnosis of sepsis was conducted via quantitative analysis of lysophosphatidylcholine 16:0 (LPC 16:0) by using matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry based on a parylene-matrix chip. In the first step, specific mass peaks for the diagnosis of sepsis were searched by comparing MALDI-TOF mass spectra of sepsis patient sera with healthy controls and pneumonia patient sera. Two mass peaks at <I>m</I>/<I>z</I> = 496.3 and 518.3 were chosen as those that are specifically different for sepsis sera to compare with healthy controls and pneumonia patient sera. These mass peaks were identified to be protonated and sodium adducts of LPC 16:0 by using tandem mass spectra (MS<SUP>2</SUP> and MS<SUP>3</SUP>) of purely synthesized LPC 16:0 and extracted LPC 16:0 from a healthy control and a sepsis patient. In the next step, a standard curve for LPC 16:0 for the quantitative analysis of LPC 16:0 with MALDI-TOF MS based on the parylene-matrix chip was prepared, and the statistical correlation to the LC-MS analysis results was demonstrated by using the Bland-Altman test and Passing-Bablok regression. Finally, MALDI-TOF MS based on the parylene-matrix chip was used for the quantification of LPC 16:0 with sera from patients with severe sepsis and septic shock (<I>n</I> = 143), pneumonia patients (<I>n</I> = 12), and healthy sera (<I>n</I> = 31). The sensitivity and the selectivity of medical diagnosis of sepsis was estimated to be 97.9% and 95.5% by using MALDI-TOF MS based on the parylene-matrix chip, respectively.</P> [FIG OMISSION]</BR>
Protease 무첨가 약주의 가속 숙성에 따른 이화학적 특성 변화
노종민(Jong-Min Noh),강지은(Ji-Eun Kang),최지호(Ji-Ho Choi),정석태(Seok-Tae Jeong),최한석(Han-Seok Choi) 한국식품과학회 2014 한국식품과학회지 Vol.46 No.6
Protease 무첨가가 숙성약주의 이화학적 특성에 미치는 영향을 조사하였다. 발효온도 20-25℃에서는 정상적으로 알코올 생산을 하였으나 발효온도 10℃에서는 첨가구보다 21.3%, 15℃에서는 9.4%, 30℃에서는 13.2% 낮은 알코올 생산성을 보여주었다. 발효기간은 발효온도 25℃를 제외하고 protease 첨가구 대비 증가하는 것으로 나타났다. 총 유기산 함량은 1.0-2.7배 증가하였으며, lactic acid와 acetic acid가 증가된 반면 pyroglutamic acid의 함량이 최대 51.1배 감소되었다. 산도와 휘발산은 증가되었고 pH는 감소되는 것으로 나타났다. 아미노산도는 protease 첨가구에 비하여 3.0-5.2배, 유리 아미노산 총량은 5.2-11.9배 낮게 나타났다. Protease 첨가구의 주요 유리 아미노산은 alanine, arginine, leucine, lysine인 반면 무첨가구는 alanine, arginine, leucine, phenylalanine이었다. 색차는 protease 첨가구에 비해 1.2-3.0배 낮아졌다. Normal alcoholic fermentation took place at 20-25oC in yakju (traditional Korean rice wine) prepared without the addition of protease (non-addition group). The total concentration of organic acids increased by 1.0-2.7 fold in the nonaddition group. While the concentration of lactic acid and acetic acid increased, the pyroglutamic acid concentration decreased by 51.1 fold. Consequently, the total acidity and volatile acid concentration increased, and the overall pH decreased. Compared to the addition group, the non-addition group showed a 3.0-5.2 fold increase in the amount of amino acids; however, the total estimated concentrations of free-form amino acids were 5.2-11.9 times lower than those in the latter group. The major amino acids found in the non-addition group were alanine, arginine, leucine, and phenylalanine. The yakju preparation from the non-addition group showed a 1.2-3.0 fold decrease in the final color intensity as compared to that from the addition group.
설계단계에서의 Eco Designer 활용에 관한 연구 : 벽면 개구부 면적비 중심으로
노종민(Noh Jong-Min),이수진(Lee Su-Jin),최정민(Choi Jeong-Min) 한국건축친환경설비학회 2010 한국건축친환경설비학회 학술발표대회 논문집 Vol.2010 No.10
Recently, the interest for environment friendly is a hot issue. Korea is not an exception in the global problems, and national efforts should be continued to decrease the CO₂consumption cooperating with others. Globally, in the building field that has 30-40% of total energy usage, it is soon prepared the resolution to decrease the energy usage. In the building field, the adaptation of technology concerned with IT is the urgent, and among them, paradigm shift to BIM system method is needed. Energy consumption of this building is much influenced by a fact determined in the design stage of building initially. Better energy reduction design should be with consideration to reduction of energy in the design stage.