시간지연을 갖는 적분 시스템의 PID 제어기 동조법

이윤형(Yun-Hyung Lee),안종갑(Jong-Kap Ahn),소명옥(Myung-Ok So),이준탁(Jun-Tack Lee) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-

A simple tuning methods of PI, PD and PID controller are proposed for an integrating process with time delay. This is based on matching the coefficients of corresponding powers of s in the numerator and that in the denominator of the closed-loop transfer function. For set-point tracking problem, the derived controller is found to be a PD controller which is shown by Lee's tuning rule based on minimizing the performance indexes (lSE, IAE, ITAE) using a real-coded genetic algorithm. A method can be also proposed PI, PID controllers according to tuning parameter lambda (A) similar to IMC method. Simulation example is given to illustrate the set-point tracking performance of the proposed method.

요골동맥을 이용한 관동맥 조영술의 유용성

윤정한,이승환,이한요,김장영,김일회,최윤종,이형준,이명옥,김승년,황성오,홍인수,최경훈 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.10

7두의 개에서 배설성 요로조영술을 통한 신장 기능 평가

최윤정,이기자,최형준,이용진,박성준,송근호,정성목,최호정,이영원 忠南大學校 獸醫科大學 動物醫科學硏究所 2005 動物醫科學硏究誌 Vol.13 No.-

Excretory urography is a type of contrast study used to verify and localize upper urinary tract disease. It is an inexpensive and easy way to visualize of anatomic and functional status of the kidney and has been used as a primary imaging modality for the evaluation of urinary tract abnormalities. We describe urological signs of 7 dogs who examined with excretory urography and ultrasonography. Six cases were referred to veterinary medical teaching hospital. Chungnam national university (VMTH, CNU) to evaluate renal function after the treatment for renal failure and one case was referred showing hematuria. In case 1, 2 and 4, blood test and urinalysis was normal and the results of excretory urography presented that renal function were normal range. In case 3, the results of urinalysis, ultrasonography, and excretory urography except blood test presented abnormal kidney and hydronephrosis was diagnosed. In case 5 and 6, blood test, urinalysis, ultrasonography and excretory urography indicated renal failure. In case 7, blood test, urinalysis and ultrasonography presented partially abnormal signs, however, the results of excretory urography was normal range.

PLZT 세라믹을 이용한 SAW Filter의 특성

이수대,이찬구,안형주,문준규 경남대학교 신소재연구소 2003 신소재연구 Vol.15 No.2

현재 사용되고 있는 SAW 필터 기관물질 중 세라믹 기관은 다공정과 생산에 따른 물성의 재현성 부족을 제외한다면 단결정 기관에 비해 생산단가의 저렴화, 생산공정의 단순화 및 대량생산의 측면에서는 훨씬 경쟁력이 있다. 따라서 본 연구에서는 고온 압축성형법에 의해 1235℃의 온도와 200㎏/㎠의 압력에서 30시간동안의 제조조건에서 조성비 x/65/35(x=5-8)인 PLZT 세라믹 기관들을 제조하여 SAW필터로써의 응용가능성을 살펴보았다. 각 조성별 유전을, SAW 전파 속도, 기계결합계수 등을 측정 비교한 결과 SAW 필터 기관물질로 가장 적합한 조성비는 7/65/35였다. 이 조성비로 제작한 SAW 필터에서 상대적으로 양호한 출력 특성을 얻었고 단결정 기관으로 제작한 SAW 필터에 버금가는 특성을 확인할 수 있었다. The single crystal substrate has been the industrial standard for the design of SAW filters for a long time. However, the ceramics substrate had more simple fabricated process than the crystal. In this study, it was attempted that single crystal was substituted for PLZT(La/Zr/Ti = x/65/35, x=5∼8 at. %) ceramics. The ceramics substrate was prepared by hot-pressed method at temperature 1235C, 200㎏/㎠, 30hrs. The real permittivity, SAW velocity and mechanical coupling factor of PLZT ceramics were measured for a different La mol% content. In the results, we could observed that 7/65/35 composition SAW filter had a good characteristics of frequency response.

미분층 흡착반응기에서 다공성 합성수지 입자내의 확산

이성식,전성균,김형준 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.1

Synthetic porous resin particles contacting o-Cresol, 2-Picoline and o-Nitrophenol in aqueous solution, Uptake curves were collected by use of a differential reactor for various concentration ranges. The effective intraparticle diffusivity, D_(e), based on the concentration difference in the liquid phase, was determined by comparing experimental and theoretical uptake curves. The experimental data of higher values of the equilibrium amount adsorbed agreed well with the theoretical values and the values of D_(e)' was independent of the amount adsorbed. The physico-chemical properties of adsorbate affected on adsorption equilibrium and kinetic parameters. Existence of nitro group at ortho position enhance the adsorption capacity and accelerated intraparticle mass transfer.

산업용 로봇의 실시간 운용을 위한 역기구학 해석

이용중,이상태,박형준 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.1

This study solves the inverse kinematics problem of industrial FANUC robot. Because every joint angle of FANUC robot is dependent on the position of end-effector and the direction of approach vector, arm metrix T_6 is very complicated and each joint angle is a function of other joint angles. Therefore, the inverse kinematics problem can not be solved by conventional methods. Noticing the fact that if one joint angle is knows, the other joint angles are calculated by the algebraic methods, θ_1 is calculated using neumerical analysis method, and solves inverse kinematics problem. This proposed method, in this study, is more simpler and faster than conventional methods and is very useful in the real-time control of the manipulator.

Peripheral odontogenic fibroma에 관한 증례보고

이제호,최형준,이종갑,장태숙 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.3

The peripheral odontogenic fibroma (WHO type) is a relatively rare and characteristically benign and unencapsulated, exophytic gingival mass of fibrous connective. Odontogenic epithelium is found within the gingival mass, but usually appears to play a minor role when compared to the fibrous component. The connective tissue is ranged from markedly cellular to relatively acellular and well collagenized. but the connective tissue in this case report appears less cellular. Peripheral odontogenic fibroma must be differentiated histologically from peripheral ossifying fibroma, Peripheral cemental epithelial odontogenic tumor and Peripheral ameloblastoma. The author reports the following conclusions after clinical and radiological examination, excisional biopsy and reviewing literatures. 1. Peripheral odontogenic fibroma is rare lesion and frequently occurs in interdental papila as a form of fibroblastic connective tissue including odontogenic epithelium within the lesion. 2. Peripheral odontogenic fibroma must be differentially diagnosed with Peripheral ossifying fibroma by including less cellular connective tissue, odontogenic epithelium and dysplastic dentin. 3. Treatment consists of surgical excision including removal of alveolar bone which is eroded under the lesion.

세네카의 레저사상에 관한 연구

이동현,김형준,김성룡 群山大學校 1997 論文集 Vol.25 No.-

Seneca is the most important philosopher on leisure studies. It is said that his viewpoints for leisure ard written in the works of “on the Shortress of Life”“On Tranquility” On Leisure”and in western world, to say nothing of the study focused on Seneca´s philosophy of leisure. So it is the aim of this essay to make review what the Seneca´s philosophy of leisure is and, also what the philosophy tells us to think about the meaning of leisure toward our learning society.

패턴 Top Rounding 효과를 고려한 패턴 붕괴 전산모사

이형주,박준택,오혜근 한양대학교 이학기술연구소 2002 이학기술연구지 Vol.5 No.-

패턴의 선폭이 100 nm 이하로 작아짐에 따라 발생하는 패턴의 붕괴 현상은 반도체생산과 수율에 많은 영향을 미친다. 패턴 붕괴 현상은 리소그래피 과정 중 현상 후 세척액을 건조하는 과정에서 주로 발생하며 세척액의 표면장력에 의한 모세관 현상이 주된 원인으로 알려져 있다. 패턴 붕괴 현상을 시뮬레이션하기 위하여 패턴이 세척액에 외해서 균일한 압력을 받을 때와 집중 압력을 받을 때의 역학적 모델을 세우고 각각의 모델을 통하여 선폭과 패턴간의 거리에 따른 임계 높이/선폭비 (aspect ratio)를 계산하여 실제 실험 결과와 일치하는 모델을 선정하였다. 시뮬레이션 결과 패턴의 top 부분이 둥근 (rounded top) 패턴이 각진 (flat p) 패턴에 비해 변형이 줄어들 수 있다는 것을 확인할 수 있었다. The pattern size is reduced as the device is more integrated. The resist deformation phenomenon has been a serious problem under 100 nm line width pattems. The most applicable model for an existing empirical result is chosen to create a simulation tool by comparing the two mechanical models when a pattern receives a distributed pressure or a concentrated pressure from the rinse liquid. Based on the chosen model, the critical aspect ratio with respect to line width and space can be calculated. The simulated results show that the pattern collapse phenomenon is reduced for a rounded top resist profile rather than for aflat top profile

상아질 접착제를 사용한 광중합 복합레진과 Glass lonomer Cement의 전단 결합력에 관한 연구

이제호,이종갑,권병렬,최형준 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.2

The purpose of this study was to compare shear bond strength of composite resin using several dentin bonding agents and light cured glass ionomer cement(Fuji Ⅱ LC). 40 Bovine primary anterior teeth were used for this experiment.Labial surface of teeth were flattened.It were divided into four groups.Each group was composed of 10 teeth.The material used for this experiment were Scotchbond Multipurpose-Z-100,Allbond 2-Aelitefil,Gluma-Pekalux,light and cured glass ionomer cement(Fuji Ⅱ LC). Each of the materials was applied to the exposed surface of 10 teeth by insertion into a cylindrical shaped matrix which is 3mm diamiter and 3mm in height. The completed specimens were stored at 37℃ under 100% humidity for 24 hours:the shear bond strength of material to detin surface were measured with INSTRON universal testing machine. The results were as follows: 1.Shear bond strength to detin surface increased in oder of light cured glass ionomer cement(Fuji Ⅱ LC),Gluma,Allbond 2,Scotchbond Multipurpose. 2.Between shear bond strength of light cured glass ionomer cement(Fuji Ⅱ LC) and Allbond 2,there was statistical significace(P<0.05). 3.Between shear bond strength of light cured glass ionomer cement(Fuji Ⅱ LC) and Scotchbond Multipurpose,between shear bond strength of Gluma and Scotchbond Multipurpose,there was statistical significace(P<0.01). The shear bond strength of detin bonding agents were higher than light cured glass ionomer cement.The reason is that material and quality of detin bonding agent were enhanced.Further investigation is necessary to improve shear bond strength of light cured glass ionomer cement.