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측뇌실내 수막종 : 임상분석 및 수술접근법 Clinical Analysis and Surgical Approach
양희진,김동규,정희원,이현구,김현집,조병규,최길수,한대희 대한신경외과학회 1992 Journal of Korean neurosurgical society Vol.21 No.10
The authors present six cases of lateral ventricle meningiomas treated at Seoul National University Hospital between 1979 and 1991. These six cases of lateral ventricular meningiomas constitute 1.8 percent of all intracranial meningiomas and 16.7 percent of mass lesions of the lateral ventricle. The mean age was 29 years ranging from 11 to 50 years, younger than that or intracranial meningiomas with a statistical significance(p<0.01). Four of the patients were women and two were men. All cases were located in the trigonal area. The most common clinical symptoms and signs were related to increased intracranial pressure such as headache, nausea and vomiting. Based on the clinical presentation and radiological features(CT. MRI and angiography), correct preoperative diagnosis was possible in five cases. Gross total removal of the tumor was achieved in all cases. There was no operative mortality. A temporal gyrus approach was used in five cases with good surgical results. The benefits and drawbacks of each surgical approach for meningiomas of the lateral ventricle is discussed with review of pertinent literatures.
추연규,박희경 진주산업대학교 1999 論文集 Vol.38 No.-
In this paper, an auto-parking control system of truck-trailer is simulated using predictive fuzzy algorithm. The forward and backward dynamic equation of truck-trailer is used to design a predictive fuzzy controller and plant. With the porposed algorithm, the simulation revealed that truck-trailer was parked well in the parking area.
3-Joint Planar Type 로봇 매니퓰레이터의 자기동조적응제어에 관한 연구
김규로,양희주,유용석,최명진,오택열 慶熙大學校 大學院 院友會 1996 高凰論集 Vol.17 No.-
This study has parallelogram trajectory tracking of Three Joint Planar type Robot Manipulator. The equation of motion for the three joint planar manipulator are obtained by substituting Lagrange's energy expression into Euler-Lagrange's equation and forming the appropriate derivative. Lagrangian method allows us to obtain the dynamics equations for very complicated systems in the simplest manner possible. SISO model is used for design of the controller. The design of controllers may be considered primary controller for manipulators to track the desired trajectory under ideal conditions and secondary controller to compensates for undesirable deviations of the motion from the trajectory caused by external and internal disturbances. The aim of this paper is to evaluate the efficiency by self-tunning adaptive control and considering a characteristic of control. Through the computer simulation, obtained the following results 1) selt-tunning adaptive control is superior to PD control, 2) During the learning period, the adaptive control algorithm is searching proper estimates and controller gains. After this period, the outputs of the joints start tracking closely the desired valued.
산소분압열처리를 이용한 폐기물산화철로부터의 단상 및 복합상 산화철의 제조
임희대,이찬규,허석환,박연준 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-
Oxygen pressure heat-treatment with CO-CO2 gas mixture was introduced to purify the waste oxidized iron in shortblast process. To determine the temperture and oxygen partial pressure, Fe-O phase diagrams was used. single phase FeO, Fe₃O₄and composite phase FeO-Fe₃O₄, Fe-FeO could be obtained sucessfully in the range of 10(-17)∼10(-19) in Po₂at 800℃.
조규판,원재선,김동희,노채균,배영호 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1
In this paper, we propose the high frequency resonant inverter of the time sharing type which has the effects that the duty cycle of each elements and the thermal loss can be reduce. The analysis of the proposed circuit is described generally by using the normalized parameters. Also, the principle of basic operation and the characteristics of drive were estimated by the switching frequency and the load parameters. And we got the data for designing by the characteristic values obtained at the estimate of characteristic. At the same time, the example of the design's method was proposed and the waveforms of simulation were compared with theoretical waveforms. It is certain that the proposed circuit will be used and expanded in the high frequency power supplies like induction heating systems.
[trans-FeCl_2(O=PPh_3)_4]^+ [FeCl_4]^-·toluene 합성 및 구조
박희숙,박병규,이순원 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2
The reaction of FeCl_3(PPh_3)_2, Ⅰ, with 2,6-diisopropylaniline in the presence of magnesium gave an ionic salt [FeCl_2(O=PPh_3)_4]·C_6H_5CH_3, Ⅱ. This product has been characterized by ^1H-NMR and single crystal X-ray crystallography. Crystal data for Ⅱ: Monoclinic, space group Cc, a = 31.499(6)Å, b = 14.796(4)Å, c = 18.033(4)Å, β = 116.87(1)°, Z = 4, R(wR_2) = 0.0692(0.1717).