자기베어링 런아웃의 적응제어

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.

能動 振動制御 半徑方向 磁氣베어링의 强性에 관한 硏究

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.

예압과 냉각방식에 따른 고속주축의 온도분포 및 열변형 해석

김수태,김재실,최대봉,김진한,정동수 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

The use of high speed motor spindle is increasing for high speed machine tools recently. The important problem in the high speed spindles is to reduce and minimize the thermal effect by the motor and ball bearings. Thermal characteristics according to the bearing preload, hollow shaft and oil jacket cooling are studied for the spindle with the oil mist lubrication and high frequency motor. In this study, temperature distribution and thermal deformation are analyzed by using the numerical method This results show that temperature distribution and thermal deformation of the high speed spindle system can be estimated reasonably by using the three dimensional model through the finite element method and support thermal optimization and more effective cooling method.

Semi-NC 선반 동력전달과정의 진동 및 소음방지

안대균,김재실 國立 昌原大學校 産業技術硏究所 1999 産技硏論文集 Vol.13 No.-

업체에서 자체설계하여 생산중인 소형 Semi-NC 선반의 기어 Box에서 소음 및 진동이 발생하였다. 이 진동 및 소음에 대한 원인을 규명하고 방지대책을 수립하고자 기어 Box와 동력전달과정에 대하여 주축의 횡진동 해석, Gear-Shaft system의 비틀림 진동 해석, 기어 Box에 대한 진동 모드 시험과 공명 주파수를 해석하였다. 주축의 임계 속도(Critical Speed)와 시스템의 주 동작 속도를 비교한 결과, 공진 형상은 발생하지 않는 것으로 판단되었다. 하지만, 비틀림 진동 해석과 기어 box의 진동 모드 시험 및 공명 주파수 해석에서는 기어들의 가진 주파수와의 공진 가능성이 확인되어 기어잇수비의 변경과 기어 box의 내부에 보강재를 설치함으로써, 공진이 의심되는 주파수 대역을 완화시켜 진동 및 소음을 줄일 수 있었다.

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.

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.

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.

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.

Treatment outcomes of curative radiotherapy in patients with vulvar cancer: results of the retrospective KROG 1203 study

Kim, Youngkyong,Kim, Joo-Young,Kim, Ja Young,Lee, Nam Kwon,Kim, Jin Hee,Kim, Yong Bae,Kim, Young Seok,Kim, Juree,Kim, Yeon-Sil,Yang, Dae Sik,Kim, Yeon-Joo The Korean Society for Radiation Oncology 2015 Radiation Oncology Journal Vol.33 No.3

Purpose: We evaluated the prognostic factors and clinical outcomes of 56 patients with vulvar cancer treated with curative radiotherapy (RT) or concurrent chemoradiotherapy. Materials and Methods: Overall survival (OS) and disease-free survival (DFS) were assessed retrospectively. Prognostic factors evaluated included age, International Federation of Gynecology and Obstetrics (FIGO) stage, TNM classification, tumor size, treatment modality, RT duration, and RT field. The association between the tumor human papillomavirus (HPV) status and survival was analyzed in 35 patients. Results: During the median follow-up of 2.8 years (range, 0.3 to 18.9 years), 21 patients (37.5%) experienced treatment failure. Fifteen patients (27%) had local failure: nine (16%) local failure only, three (5%) locoregional failure, two (4%) local and distant failure, and one (2%) locoregional and distant failure. Of 56 patients, seven (13%) had persistent disease at the first follow-up at 2 months and all but one died within a year after completing RT. The 5-year OS and DFS were 51.6% and 44.0%, respectively. In multivariate analysis, clinical size ${\geq}3$ cm predicted a poor prognostic factor for DFS (p = 0.040) and age (${\geq}70years$) was poor prognostic for DFS (p = 0.032) and OS (p = 0.048). Patients with HPV-positive tumors tended to have better 5-year OS and DFS, but the differences were not significant statistically. Conclusion: Clinical size ${\geq}3$ cm was a significant prognostic factor for DFS. However, age was the most important prognostic factor for DFS and OS in patients treated with curative RT. Further studies are needed to determine which treatment should be considered for old age ${\geq}70years$.

Treatment outcomes of curative radiotherapy in patients with vulvar cancer: results of the retrospective KROG 1203 study

Youngkyong Kim,Joo-Young Kim,Ja Young Kim,Nam Kwon Lee,Jin Hee Kim,Yong Bae Kim,Young Seok Kim,Juree Kim,Yeon-Sil Kim,Dae Sik Yang,Yeon-Joo Kim 대한방사선종양학회 2015 Radiation Oncology Journal Vol.33 No.3

Purpose: We evaluated the prognostic factors and clinical outcomes of 56 patients with vulvar cancer treated with curative radiotherapy (RT) or concurrent chemoradiotherapy. Materials and Methods: Overall survival (OS) and disease-free survival (DFS) were assessed retrospectively. Prognostic factors evaluated included age, International Federation of Gynecology and Obstetrics (FIGO) stage, TNM classification, tumor size, treatment modality, RT duration, and RT field. The association between the tumor human papillomavirus (HPV) status and survival was analyzed in 35 patients. Results: During the median follow-up of 2.8 years (range, 0.3 to 18.9 years), 21 patients (37.5%) experienced treatment failure. Fifteen patients (27%) had local failure: nine (16%) local failure only, three (5%) locoregional failure, two (4%) local and distant failure, and one (2%) locoregional and distant failure. Of 56 patients, seven (13%) had persistent disease at the first follow-up at 2 months and all but one died within a year after completing RT. The 5-year OS and DFS were 51.6% and 44.0%, respectively. In multivariate analysis, clinical size ≥3 cm predicted a poor prognostic factor for DFS (p = 0.040) and age (≥70 years) was poor prognostic for DFS (p = 0.032) and OS (p = 0.048). Patients with HPV-positive tumors tended to have better 5-year OS and DFS, but the differences were not significant statistically. Conclusion: Clinical size ≥3 cm was a significant prognostic factor for DFS. However, age was the most important prognostic factor for DFS and OS in patients treated with curative RT. Further studies are needed to determine which treatment should be considered for old age ≥70 years.