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Density control of ZnO nanowires grown using Au-PMMA nanoparticles and their growth behavior
Shin, Hyeon Suk,Sohn, Jung Inn,Kim, Dong Chung,Huck, Wilhelm T S,Welland, Mark E,Choi, Hee Cheul,Kang, Dae Joon IOP Pub 2009 Nanotechnology Vol.20 No.8
<P>Au nanoparticles stabilized by poly(methyl methacrylate) (PMMA) were used as a catalyst to grow vertically aligned ZnO nanowires (NWs). The density of ZnO NWs with very uniform diameter was controlled by changing the concentration of Au-PMMA nanoparticles (NPs). The density was in direct proportion to the concentration of Au-PMMA NPs. Furthermore, the growth process of ZnO NWs using Au-PMMA NPs was systematically investigated through comparison with that using Au thin film as a catalyst. Au-PMMA NPs induced polyhedral-shaped bases of ZnO NWs separated from each other, while Au thin film formed a continuous network of bases of ZnO NWs. This approach provides a facile and cost-effective catalyst density control method, allowing us to grow high-quality vertically aligned ZnO NWs suitable for many viable applications. </P>
Shin, Dae-Hwan,Choi, Kyu-Seok,Cho, Byung-Suk,Song, Suk-Gil,Moon, Dong-Cheul,Hong, Jin-Tae,Lee, Chong-Kil,Chung, Youn-Bok 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.10
A 1:1 mixture of acriflavine (ACF; CAS 8063-24-9) and guanosine is under evaluation in preclinical studies as a possible antitumor agent. Guanosine is known to potentiate the anti-cancer activity of ACF. We therefore investigated the pharmacokinetics of guanosine following administration of the ACF/guanosine mixture in rats. Rats were given guanosine (1 or 5 mg/kg) or ACF/guanosine (2 or 10 mg/kg) by i.v. bolus; or guanosine (3 or 15 mg/kg) or ACF/guanosine (6 or 30 mg/kg) by i.m. injection. We found that guanosine was rapidly cleared from the blood and transferred to tissues after i.m. administration of ACF/guanosine. The mean plasma half-lives ($t_{1/2}$) at the $\alpha$ and $\beta$ phases were 0.091 and 6.86 h, or 0.092 and 7.51 h at a dose of 1 or 5 mg/kg guanosine, respectively. ACF had no effect on the plasma disappearance of guanosine following either i.v. bolus or i.m. administration of the combination mixture. Moreover, the ACF combination with guanosine did not significantly alter the values of MRT, $V_{dss}$. and $CL_t$ of guanosine. Guanosine exhibited linear pharmacokinetics over the dose range from 1 to 5 mg/kg for i.v. doses and 3 to 15 mg/kg for i.m. doses. The bioavailability of guanosine after i.m. administration was 84% for 3 mg/kg dose and 88% for 15 mg/kg dose. ACF had no effects on biliary and urinary excretion of guanosine after i.m. administration. The cumulative amount of guanosine in urine after i.m. administration was about 5-fold larger than that in bile, indicating that guanosine is mostly excreted into the urine. Guanosine was widely distributed in all tissues examined in this study, but was most highly concentrated in the kidney after i.m. administration, followed by slow excretion to bile or urine. ACF had no effect on the tissue distribution of guanosine following i.m. administration. These characterizations of the pharmacokinetics of guanosine after administration of the ACF/guanosine combination will be useful in providing preclinical and clinical bases for the potential application of this combination to the treatment of cancer.
김대웅(Dae-Woong Kim),박성근(Sung-Keun Park),강신철(Shin-Cheul Kang),이승호(Sung-Ho Lee) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
The valve performance has been evaluated from the theoretical equation based on design information such as packing thrust, spring pre -load and friction coefficient (μ). The accuracy of those data can be lower than that of vendor's initial design data. Especially, the friction coefficient can be degraded with time than the original condition and the valve performance calculated using the previous friction coefficient can not be available. Accordingly, this paper is describing a new performance evaluation method of valve based on diagnostic test data which are acquired from a site valve tested in static and dynamic conditions. Especially, this paper provides a new method using friction coefficient (μ) which is derived from the data acquired in the valve's design basis condition.
신대철,권혁민,Shin, Dae-Cheul,Kwon, Hyuk-Min 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.7
제안한 유도가열 시스템은 증류탑 장치에 사용되는 특수충진체에 의한 열교환기술과 IH(Induction-Heating) 전자유도가열용의 특수한 고주파 전력회로 기술을 응용한 차세대 가열방식이다. 특히 일체의 연소과정이 없다는 점에서 작업환경의 개선이 가능하며 본 기술은 IGBT 대응의 고주파 인버터를 사용하여 상용교류로부터 수[kHz]의 고주파교류(HFAC)를 발생시킬 수 있다. 본 논문에서는 1.5[kW]급 하프-브릿지 공진형 인버터 시스템과 공진부하의 동작해석, 특성분석 및 본 시스템을 이용한 2단가열 과열증기 발생장치의 개발과 시스템의 응용에 대해 논하였다. Proposed induction-heated system is innovative system which applied special high-frequency power circuit technique for thermal converse technique and IH(Induction-Heating) magnetic induction heating generated from induction-heated metallic package that is for distillation unit. In this occurs not burning, so that the working environment can be improved. This electromagnetic induction heating technique is used high frequency inverter. By using high frequency inverter high frequency alternative current (HFAC) in the range of [kHz] can be made with conventional alternative current In this contribution IGBT module is used for high frequency inverter. In this paper are discussed action analysis and characteristics analysis of 1.5[kW]-Class half-bridge resonant inverter system and resonant metallic packaged. In addition, by using this system,t how two step heating superheated steam generator is developed and application of system are also discussed.
Rat에 sulfamethazine sodium 경구투여 후 시간경과에 따른 혈청, 간장 및 근육내 잔류함유량 변화
도재철 ( Jae Cheul Do ),장지택 ( Jee Taek Jang ),이영미 ( Young Mi Lee ),조종숙 ( Jong Suk Cho ),조민희 ( Min Hee Cho ),박희주 ( Hee Ju Park ),신대길 ( Dae Gil Shin ),정종식 ( Jong Sik Jyeong ) 한국가축위생학회 2000 韓國家畜衛生學會誌 Vol.23 No.2
Sulfamethazine sodium was orally administrated to sprague-dawley strain male rats(body weight, 200-300g) with using sonde at the rate of 20 mg/100g body weight (recommended therapeutic dose) on once a day for 3 days. There were investigated the depletion rate of the suifaniethazine in serum, liver and skeletal muscle of rat at the time 8 hours, 1st, 2nd, 3rd, 4th, 5th and 6th day after administration sulfamethazine sodium. 1. The mean concentrations of sulfamethazine in serum according to the time lapsed after oral administration of the sulfamethazine sodium were showed 215.53 ± 42.99 ppm at the 8 hours after withdrawal of medicated sulfamethazine. And gradually according to the time lapsed, the concentrations of sulfamethazine residues in serum were significantly (p<.05) decreased 25.87 ± 5.18 ppm at 1st day, 2.30 ± 0.61 ppm at 3rd day and 0.11 ± 0.02 ppm at 6th day after withdrawal of medicated sulfamethazine. 2. The mean concentrations of sulfamethazine in liver were significantly (p<.05) decreased 81.77 ± 12.88 ppm to 0.11 ± 0.03 ppm between 8 hours and 6th day according to the time lapsed after oral administration of the sulfamethazine sodium for 3 days. 3. After oral administration of the sulfamethazine sodium, the mean concentrations of sulfamethazine in skeletal muscle were significantly (p<.05) decreased 35.96 ± 1.39 ppm to 0.009 ± 0.001 ppm between 8 hours and 6th day after withdrawal of medicated sulfamethazine.At the 4th day, the concentrations of sulfamethazine residues were showed 0.10 ± 0.04 ppm below 0.1 ppm at the permitted limit concentration of muscle in Korea 4. After oral administration of the sulfamethazine sodium once a day for 3 days, there were showed the highest concentration in serum (215.53 ± 42.99 ppm) than in liver (81.77 ± 12.8 ppm) and skeletal muscle (35.96 ± 1.39 ppm) at the 8 hours after withdrawal of medicated sulfamethazine. The mean concentration of sulfamethazine residues in serum, liver and skeletal muscle were gradually decreased according to the time lapsed.
축방향 누설자속 측정에 의한 유도전동기의 회전자 결함검출에 관한 연구
신대철,김영환,Shin, Dae-Cheul,Kim, Young-Hwan 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.1
유도전동기에 대한 결함 검출의 도구로서 축방향 누설자속 측정 방법을 사용할 수 있는가를 평가하고 전동기고장 검출에 관한 진단 알고리즘을 개발하기 위한 회전자에 관한 2번째 논문이다. 결함 검출을 위해 운전 중인 전동기의 끝단에 설치된 자속코일 센서로 누설자속 신호를 수집하며 전동기의 각종 결함을 검출하기 위해 시간과 주파수 영역에서 신호를 분석하였다. 센서 신호 형상이 전동기 각각의 결함에 대해 시간과 주파수 영역에서 해석하였다. 전동기의 회전자 관련 격함인 회전자봉 파손, 단락환 파손 및 회전자 편심이 축방향에서 측정된 고해상도의 스펙트럼으로부터 검출할 수 있는 방법을 확인하였다. 누설자속 스펙트럼으로부터 특정 주파수와 회전자봉 통과주파수의 측파대를 분석함으로서 회전자 결함을 검출하는 방법을 알았다. 또 유도전동기에 대하여 축방향 누설자속 측정을 위한 최적의 자속코일센서 및 측정시스템을 검증하고 회전자 결함을 검출하기 위한 방법을 개발하였다. The second part of paper related rotor failure is to evaluate that the axial magnetic flux measurement could be used as a tool of the condition monitoring system for the induction motor and to develope the diagnostic algorithm for the various fault in the electric motors. The magnetic leakage flux signal is captured by the flux coil located at the end of motor without the disturbance of the operation. And the signal is analyzed both time and frequency domain to detect the failure of the motor. Specific signature can be described in tin and frequency domain for each fault of the motor. The experimental test found that the rotor failures - broken rotor bar, broken end ing and rotor eccentricity, could be detected from the spectrum with high resolution. The method of detecting the rotor fault was found by analysing the specific frequency and the sideband of the rotor bar pass frequency from axial leakage flux spectrum. In addition the optimal flux coil and measuring equipment for the axial leakage flux measurement was verified and the diagnostic method for the detection of the rotor related failure was developed.