개방 스터브를 갖는 평행결합선로의 해석과 응용

이원균,이홍섭,황희용 江原大學校 産業技術硏究所 2007 産業技術硏究 Vol.27 No.B

In this paper, the exact analysis of the parallel coupled line with open stub is presented. This structure shows LPF characteristics with broad stopband and sharp skirt characteristics. We derived the exact Z-matrix expression of the structure. In order to show the validation of the expression we designed 3^(th) order Chebyshev LPF using the structure. The simulated data excellently agreed with the predicted values by the calculation using the derived expression.

청신경초종의 수술에서 골미로를 통한 접근법 : 후하골을 통한 접근법과의 비교 Comparison with the Suboccipital Approach

정희원,이정일,김종수,오창완,정영섭,장선오,김종선,최길수 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.10

The results of a series of thirteen translabyrinthine removals of acoustic neurinomas are reported From 1990 March to 1993 May, thirteen patients with acoustic neummas underwent translabyrinthine removal at Seoul National University Hospital with cooperation of Department of Neurosurgery and Otolaryngology. In four patients with the medium-sized(ll-20mm) tumors, complete removal with preservation of the facial nerve was possible. In nine patients with the large(21-4Omm) tumors, complete removal of the tumor was possible in seven. Preservation of the facial nerve was possible in all but one, whose facial nerve was incidentally transected at the distal intracanalicular portion and was anastomosed end-to-endly. In one, postoperative leakage of cerebrospinal fluid required reoperation. The results of translabyrinthine approaches were compared With those of suboccipital approaches performed during the same period. In medium-sized or large acoustic tumors, translabyrinthine approach was comparable with suboccipital approach in the rate of total tumor removal, preservation of the facial nerves, and complication.

인체 헤모글로빈의 효소반응성에 대한 연구

이동섭,안희중,김응수,이영보,최상규 內務部 國立科學搜査硏究所 2002 國立 科學 搜査 硏究所 年報 Vol.34 No.-

Back Propagation 알고리즘을 이용한 산업용 로봇의 견실제어

윤주식,이희섭,윤대식,한성현 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

Neural networks are works are used in the framework of sensor based tracking control of robot manipulators. They learn by practice movements the relationship between PSD(an analog Position Sensitive Detector) sensor readings for target positions and the joint commands to reach them. Using this configuration, the system can track or follow a moving or stationary object in real time. Furthermore, an efficient neural network architecture has been developed for real time learning. This network uses multiple sets of simple back propagation networks one of which is selected according to which division(corresponding to a cluster of the self-organizing feature map) in data space the current input data belongs to. This lends itself to a very training and processing implementation required for real time control.

두개강내 유표피종의 수술적 치료성적

김종수,정희원,이선호,정영섭,김현집,최길수,한대희 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.8

Fifteen patients with intracranial epidermoid cysts underwent microsurgical resection between January, 1980 and June, 1994. The average age of the patients was 38.9 years and the male to female ratio was 3 : 2. The most frequent location was the cerebellopontine angle(9) and other locations included parasellar(2), sylvian fissure(1), paratrigeminal(1), pineal(1) and parasagittal(1). Common clinical presentations were cranial nerve impairment and mass effect. Gross total removal was possible in 8 cases. During 57.9 months of mean follow up period there were 5 recurrences, one of which occurred after a complete surgical resection and the others were symptomatic recurrences after incomplete removal. The mean duration from the first operation to reoperation was 8 years and 3 months(2^(+10)-13^(+8) years). In every case of incomplete removal or even in complete removal cases, regular MRI follow up should be done for early detection of recurrence.

비모형화 동특성을 고려한 로보트 매니플레이터의 실시간 적응제어

한성현,김휘동,이진,이현철,이희섭 경남대학교 신소재연구소 1994 論文集 Vol.4 No.-

기존의 로봇 매니퓰레이터의 제어방법들을 간단한 고전적 제어방법들의 응용은 가능하지만, 고속운전이나 빈번한 부하변동에 의해 역학적으로 나타나는 각 관절사이의 연성(coupling), 관성파라미터의 불확실성, 모델링오차 등으로 인하여 로봇 제어기의 성능과 응용범위등은 큰 제약을 받게 된다. 본 연구에서는 제어기의 예측불허의 외란 및 파라미터의 불확실성 등에 대한 적응성의 향상을 위하여 적응 모델추종제어기법을 적용하여 로봇 매니퓰레이터 동적모델에서의 매개변수의 불확실성 및 미지의 외란, 존재, 갑자스런 부하변동에서도 좋은 제어성능이 유지 될 수 있는 견실한 로봇 관정 제어방식에 대한 연구를 중점으로 다룬다. 적응제어알고리즘은 초안정도(hyperstability)이론과 적응 모델 추종 제어의 원리를 바탕으로 유도되었고, 적응 제어기의 기온구조를 비선형성의 보상을 위한 내부루프의 MRAC구조와 고정된 게안을 갖는 외부루프와 PID제어기의 조합으로 구성되는 혼성구조의 제어기를 제언한다. In this paper, robust adaptive control approach is presented to inplement of the real time control of the industrial robot manipulator. The purpose of proposed adaptive control scheme is to achieve good tracking performance of desired trajectory tracking of joint position and veloeity under the existence of the payload variation and uncertinity of inertia parameter. The feedback gains of the controller are updated and adaptied in each sampling time to achieve the desired control performance. The proposed adaptive control algorithm is developed within the framework of adaptive model following control scheme using the Lyapunov direct method. To illustrate the performance of the proposed adaptive controller, simulation test is performed in the presence of the parameter uncertainties and payload variations.

원발성 두개강내종양 2,616례의 통계학적 연구(1976-1995)

황승균,정희원,오창완,양희진,남도현,이상형,정영섭,김동규,왕규창,한대희,최길수,조병규 대한신경외과학회 1997 Journal of Korean neurosurgical society Vol.26 No.7

클럽 샤프트(Club Shaft) 특성에 따른 골프 스윙(Golf Swing)동작 분석

김성일,김기형,김형수,이현섭,김진욱,안찬규,김희진 한국운동역학회 2002 한국운동역학회지 Vol.12 No.2

본 연구는 클럽 샤프트의 대표적인 재질인 그라파이트(graphite)의 유연한(flexible) 클럽 샤프트(club shaft)의 특성에 따라 피험자가 운동학적(kinematics) 요인이 되는 관절의 각변위, 각속도, 각가속도, 클럽헤드의 속도와 가속도와 같은 변인들이 어떻게 적응하는지 비교 분석하여 보다 효율적인 드라이버 선택에 도움을 주며 샤프트 특성에 따른 신체관절의 움직임에 대한 자료를 제시하고자 하였다. 고속 카메라 2대의 속도는 500fps로 하였고 각 regylar,stiff, x-stiff, 자신의 클럽을 포함 각 4개의 클럽을 사용하여 각 클럽당 3번씩 촬영하였으며 목표방향에서 20m이상 벗어나는 경우의 촬영은 다시 촬영하였다. 본 연구에서는 디지타이징(digitizing)을 신체 9개 마커는 강체로 가정된 클럽과 신체분절 모델로 정의하였으며 2 대의 카메라(500fps)로부터 얻은 avi화일을 컴퓨터에 저장하고 자료로부터 Butterworth 6th order recursive digital filter를 사용하여 1차 자료를 smoothing 하고 DLT를 이용하여 3차원 좌표를 구성하도록 한다. 좌표값을 얻기 위하여 kwon3d v3.0을 이용하였다. 본 실험은 피험자 스스로 클럽의 특성에 따라 스윙의 속도를 달리 하기 때문에 스윙의 시간이 달라지며 어느 정도 클럽이 강성에 따라 스윙시간이 빨라지는 결과로 나타났다. 이것은 피험자가 샤프트가 강성(stiffness)에 따라 스윙 속도를 빨리 하게 되는 원인이 되는 것으로 생각된다. 어깨의 각변위는 클럽이 regular의 경우 임팩트에서 각속도를 계속 유지하고 있으며 stiff, x-stiff의 경우에는 어깨의 움직임이 임팩트에서 급격하게 감소되는 것을 알 수 있다. 이것은 팔의 동작과 클럽의 힘을 크게 하기 위한 동작으로 생각된다. 어깨 각속도는 클럽이 stiff할수록 각속도가 큰 감속하는 것으로 나타났다. 손목속도는 regular 클럽의 경우 손목의 감속이 늦게 되고 임팩트에서 손목의 감속이 적게 하는 것으로 나타났으며 stiff와 x-stiff의 클럽에서 임팩트 시에 순간적인 감가속으로 인해 클럽의 속도를 증가시키고 있다. 임팩트 시에 손목의 감가속은 클럽헤드의 임팩트 시 속도를 증가시키는 결과를 보였다. 클럽헤드는 regular 클럽이 임팩트전에는 속도 증가가 커지는 결과와 일치된 결과를 보이고 있다. The purpose of this study was to find the rational method to analyze golf swing with specific property of club shaft. Three subjects were filmed by two high speed digital cameras with 500fps. The phase analyzed was downswing of each subject. The three-dimensional coordinates of the anatomical landmarks were obtained with motion analysis system Kwon3d 3.0 version and smoothed by lowpass digital filter with cutoff frequency 6Hz. From these data, kinematic and kinetic variables were calculated using Matlab(ver 5.0) The variables for this study were angular velocity and accelerations, which were calculated and following conclusions have been made : 1) Golf swing time of stiff club is faster than that of regular club. 2) In shoulder joint motion of swing with the stiff club, x-stiff showed mort rapid negative acceleration than that of regular club. 3) In regular club, the velocity of club head would be more effective velocity, which was increasing, than those of other clubs before impact. 4) In wrist joint motion of swing with stiff club, x-stiff club showed faster than regular club in the downswing and impact more rapid negative acceleration.

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1997)

김재홍,문득곤,김정수,김용준,임동진,박상훈,김희성,이민수,송기훈,김갑형,김형석,성소영,이인섭,김석우,황지환,조창근,김경문,부태성 대한화학요법학회 2000 대한화학요법학회지 Vol.18 No.3

Background : In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. Objective & Methods : For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results : In 1997. 99 strains of N. gonorrhoeae were isolated, among which 45(45.5%) were PPNG. Conclusion : The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 45.5% in 1997.

Butanol extracts of <i>Asparagus cochinchinensis</i> fermented with <i>Weissella cibaria</i> inhibit iNOS-mediated COX-2 induction pathway and inflammatory cytokines in LPS-stimulated RAW264.7 macrophage cells

Lee, Hyun Ah,Song, Bo Ram,Kim, Hye Ryeong,Kim, Ji Eun,Yun, Woo Bin,Park, Jin Ju,Lee, Mi Lim,Choi, Jun Young,Lee, Hee Seob,Hwang, Dae Youn D.A. Spandidos 2017 Experimental and therapeutic medicine Vol.14 No.5

<P>Roots of <I>Asparagus cochinchinesis</I> have been widely used to treat fever, cough, kidney disease, breast cancer, inflammatory and brain disease, although the effects of their fermented products have not been assessed until now. To investigate the anti-inflammatory effects on macrophages of a butanol extract from <I>A. cochinchinensis</I> roots fermented with <I>Weissella cibaria</I> (BAW), alterations in the inducible nitric oxide synthase (iNOS)-mediated cyclooxygenase-2 (COX-2) induction pathway and inflammatory cytokine expression were measured in lipopolysaccharide (LPS)-activated RAW264.7 cells following pretreatment with BAW. Briefly, <I>W. cibaria</I> was selected from two bacterial strains for the fermentation of <I>A. cochinchinensis</I> roots based on its hyaluronidase inhibition and NO suppression rates. Following fermentation with <I>W. cibaria</I>, the level of various key components including total phenols and protodioscin were significantly enhanced in BAW. In addition, BAW exhibited high free radical scavenging activity (IC<SUB>50</SUB>=31.62 µg/ml) and induced a decrease of intracellular ROS production in RAW264.7 cells following DCFH-DA staining. Significant suppressions in the expression level of important members of the iNOS-mediated COX-2 induction pathway and the phosphorylation of mitogen-activated protein kinase members were detected. The expressions of pro-inflammatory and anti-inflammatory cytokines were recovered in BAW pretreated RAW264.7 cells. Overall, these results suggest that BAW may suppress inflammatory responses through differential regulation of the iNOS-mediated COX-2 induction pathway and inflammatory cytokine expressions in LPS-activated RAW264.7 cells.</P>