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김재실,안승국,이재환,안대균,최헌오 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-
This article describes (1) 2 and 3 dimensional electromagnetic finite element models for an active heteropolar radial magnetic bearing, (2) the procedure for obtaining the bearing stiffnesses by simulating the models and (3) the reviews of the models by comparing an experimental test to the ideal closed loop analysis with the stiffnesses calculated from(2). The 3 dimensional model for the magnetic bearing may be very effectively applied to several types of magnetic bearings.
김재실,배철용,이재환,안대균,최헌오 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-
자기베어링의 회전정밀도에 영향을 미치는 인자로 PWM 전력증폭기, 위치 센서 등과 같은 자기베어링 구성 장치의 동특성 및 정밀도, 시스템의 정확한 모델링, 제어기법, 런아웃 등이 있다. 본 연구에서는 능동 자기베어링을 제어하기 위해 자기베어링의 PWM 전력증폭기와 회전축을 모델링하고 이를 바탕으로 능동 자기베어링 제어를 위한 PID 제어기를 구성하였으며, 변위 센서의 부착위치 및 회전축의 진원도의 영향으로 발생하는 주기적인 런아웃 요소를 첨가하여 런아웃의 영향을 확인하였으며, 런아웃(Runout)에 의해 발생하는 에러(Error)를 효과적으로 제어하여 자기베어링의 제어 정밀도를 향상시키기 위한 방법으로 기본적인 PID 제어기에 최소평균자승(Least Mean Square, LMS) 알고리즘을 적용한 적응 피드포워드 제어기를 구성하여 자기베어링의 능동 제어에서 발생하는 주기적인 런아웃을 효과적으로 제어할 수 있음을 MATLAB을 통한 시뮬레이션을 통해 확인하였다.
ULSI DRAM의 BIST 알고리즘을 위한 제어회로 설계
온정근,김대익,도경주,이영훈,이창기,전병실 전북대학교 전자산업개발연구소 1991 전자산업연구 Vol.2 No.-
Lately, more developed semiconductor technolgy is, higher integration per one chip is rapidly. Mow 64 Mb DRAM is used 0.3㎛ techonology. This very large integration is caused faults of new type, and exhaused much time for test. So algorithms which distiguish at higher faults coverage. less time and cost of test is reported. In this paper control circuit of Built-In Self Test(BIST) Algorithm was designed for ULSI DRAM and simulated with MYCAD. This control circuit is carried out steps of algorithm, controlled generation of test patterns and data, generated control signals of parallel test.
남성화를 보이는 여성에서 발견된 난소의 Steroid Cell Tumor 1예
조인호,정대훈,박영미,서영진,손영실,정철회,강영미,정수전,김영남,이경복,성문수,김기태 인제대학교 2006 仁濟醫學 Vol.27 No.-
Steroid cell tumor is a rare ovarian sex cord-stromal tumor which accounts for 0.1% of all ovarian tumors. Until now, only 4 cases have been reported in domestic literatures. Steroid cell tumor often secrets testosterone and presents virilization in adult women or precocious puberty in children. Treatment is often performed by surgical removal, adjuvant chemotherapy and radiation, but completely accepted treatment was not existed. We experienced a case of steroid cell tumor, which was manifested by typical virilization in a 43-year old patient, who was previously performed hysterectomy and unilateral oophorectomy. So, we present with a brief review of the literatures.
ULSI DRAM의 BIST 알고리즘을 위한 패턴발생회로 설계
온정근,김대익,도경주,이영훈,이창기,전병실 전북대학교 전자산업개발연구소 1991 전자산업연구 Vol.2 No.-
Lately, more developed semiconductor technolgy is, higher integration per one chip is rapidly. Mow 64 Mb DRAM is used 0.3㎛ techonology. This very large integration is caused faults of new type, and exhaused much time for test. So algorithms which distiguish at higher faults coverage. less time and cost of test is reported. In this paper control circuit of Built-In Self Test(BIST) Algorithm was designed for ULSI DRAM. This circuit generates patterns of the algorithm by input clocks.
대장균에서 Thermus caldophilus GK24의 DNA Polymerase유전자의 고발현
권석태,김현규,김중수,이대실 성균관대학교 생명과학자원연구소 1997 生命資源科學硏究 Vol.4 No.2
Thermus caldophilus GK24 (Tca) DNA polymerase is highly useful enzyme for amplifying DNA fragments by polymerase chain reaction (PCR). A plasmid, pTCA, is expression vector for Tca DNA polymerase gene in Escherichia coli under the control of tac promoter and its expression level is low. For the high expression, the DNA sequence coding for NH_2-amino acid sequence of Tca DNA polymerase was changed by PCR, and then an expression vector pTCAM was constructed. The activity of Tca DNA polymerase in E. coli harboring for pTCAM has enhanced nearly 6-fold/ml than that for E. coli harboring pTCA.
Effect of calcination temperature on the photocatalytic properties of electrospun TiO2 nanofibers.
Lee, Young-In,Lee, Jong-Sik,Park, Eun-Sil,Jang, Dae-Hwan,Lee, Jae-Eun,Kim, Kahee,Myung, Nosang V,Choa, Yong-Ho American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.10
<P>In this study, TiO2 nanofibers with a high aspect ratio and a large specific surface area were synthesized using the electrospinning technique, and the effect of calcination temperature on their crystal structure, diameter, specific surface area and photocatalytic activity was systematically investigated. The electrospun, as-prepared PVP/TTIP nanofibers were several tens of micrometers in length with a diameter of 74 nm. TiO2 nanofibers with an average diameter of 50 nm were prepared after calcination at various temperatures. The calcination temperature significantly influenced the photocatalytic and material properties of TiO2 including grain size and specific surface area. When compared to other nanostructured TiO2 materials, such as commercial TiO2 nanoparticles (P25, Degussa), the TiO2 nanofibers exhibited greater photocatalytic activity for the degradation of acetaldehyde and ammonia.</P>
Lee,Dae-Sil,Kim,Jae Jong,Koh,Sukhoon,Kim,Joong Su The Korea Science and Technology Center 1998 BMB Reports Vol.31 No.2
The N199H variant of the EcoRI endonuclease has about twice the catalytic activity of the wild-type. Aomparison of their biochemical characteristies, usingsynthetic oligonucleotides 5`-dAAAACTTAAGAA-AAAAAAAAA-3`(KA) and 5`-dTTTTTGAATTCT-TTTTTTTTT-3`(KT), helps to define the cleavage reaction pathway of these enzymes. Both EcoRI and EcoRI variant N199H were found to cleave single-stranded KA or KT about three times faster than the double-stranded forms, although the KT oligonucleotide was more susceptible. Using the ssDNA substrate in kinetic analyses, lower Km values were obtained for the N199H variant than for the wild-type at low (50mM), as well as high (200mM), sodium chloride concentrations. This difference between the endonucleases is attributed to a greater accessibility for the substrate by the variant, and also a higher affinity for the DNA backbone. It also appears that the relative activities of the two enzymes,particularly at high ionoc strength,are proportional to their populations in the monomeric enzyme form. That is, according to gel filtration data, half of the N199H molecules exist as monomers in 200 mM NaCl, whereas those of the wild-type are mainly dimeric. Consequently,the Asp199 residue of the EcoRI endonuclease may be implicated in the protein-protein interaction leading to dimerization, as well as in coupling to DNA substrates. In summary, it is proposed that active monomeric endonuclease molecules, derived from the dimeric enzyme, recognize and form a complex with a single stranded form of the DNA substrate, which then undergoes nucleophilic substitution and cleavage.