• International Journal of Aeronautical and Space Sciences
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• 제10권1호
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• pp.46-58
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• 2009

This paper deals with design procedure of online guidance and control law for future missiles that requires agile maneuverability. For the purpose, the missile with high powered side thruster is proposed. The guidance and control law for such missiles is discussed from a point of view of optimal control theory in this paper. Minimum time problem is solved for the approximated system. It is derived that bang- bang control is optimal input from the necessary conditions of optimal solution. Feedback guidance without iterative calculation is useful for actual systems. In this paper. multiple design point method is applied to design feedback gains and feed forward inputs of the guidance and control law. The numerical results show that the proposed guidance and control law has a high -performance for wide-ranging boundary conditions.

• 수산해양기술연구
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• 제26권4호
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• pp.380-386
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• 1990

The high stress, low cycle fatigue test were carried out on HT80 plates with artificial part-through notch. The LBB conditions by the net section stress approach was examined in detail. Finite element methods for the state of deformation were also applied and the results were compared with the results from experiments. From the test results, it was noted that the LBB condition in fatigue test was dependent upon the maximun load change before and after the crack penetration. The LBB criterion By the net section stress approach were slightly dependent on initial crack size. It was shown that the state of deformation can be used to predict whether the component is likely to show LBB condition or they will be broken rapidly.

• 한국언어정보학회:학술대회논문집
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• 한국언어정보학회 2002년도 Language, Information, and Computation Proceedings of The 16th Pacific Asia Conference
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• pp.92-102
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• 2002

The issue of adjuncts has long been a neglected field of linguistic study whether it be syntactic or semantic. It is only in Pustejovsky (1995) that we find a brief mention of adjuncts. In addition to what the author calls true arguments, default arguments, and shadow arguments, he sets up a class of true adjuncts citing the following sentence, Mary drove down to new York on Tuesday. We will take up a small lexical item sugiru in Japanese, and we will argue that we should posit the notion of implicit adjuncts in describing the properties with the small Japanese lexical item sugiru. Throughout the discussions that follow we will demonstrate how the notion is independently motivated irrespective of what linguistic theory we are going to adopt.

• 소음진동
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• 제11권1호
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• pp.141-146
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• 2001

This paper deals with an application of Magneto-Rheological (MR) fluid to a small size mount for precision equipment of automobiles. MR fluid is known as a class of functional fluids with controllable apparent viscosity of fluid by the applied magnetic field strength. A typical MR fluid is a suspension where pure iron particles of 1-20 (m in diameter are dispersed in a liquid such as mineral oil or silicone oil, at the concentration of 20 - 40 vol%. Electro magnetic coil is installed at the bottom of a variable-damping mount filled with MR fluid, and performance of the mount was investigated experimentally. Furthermore, the Properties of the MR Mount on experimental study were explained analytically by mechanical model of the MR mount.

• Journal of Oral Medicine and Pain
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• 제21권1호
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• pp.15-23
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• 1996

저수준레이저조사 (low level lser irradiation, LLLI) 가 골형성을 자극한다고 보고되고 있지만 골아세포기능에 있어서 어떠한 역할을 하는지 별로 밝혀진 바가 없다. 본 연구에서는 백서 두 개관 조골세포양 세포(ROB)와 백서 조골세포주(ROS17/2.8)에 대한 저수준레이저의 효과를 조사하기 위하여 세포증식, alkaline phosphatase activity, 석회화 결질형성등을 관찰하였다. 두가지 배양 세포군에 저수준레이저를 조사한 결과 저수준레이저가 alkaline phosphatase activity를 증가시킬 뿐만 아니라 석회화 결절의 형성을 촉진하는 것을 볼 수 있었다. 이러한 결과로 보아 저수준레이저는 조골세포의 기능과 무기질침착을 자극함으로써 골형성을 촉진한다고 추정된다.

• 한국식물생명공학회:학술대회논문집
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• 한국식물생명공학회 2003년도 추계학술대회 발표논문 초록집
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• pp.176-176
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• 2003

• 소음진동
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• 제11권2호
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• pp.301-306
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• 2001

Electro-Rheological (ER) fluid is applied to a controllable squeeze film damper (SFD) for stabilizing a flexibly supported rotor system. ER fluid is a class of functional fluid whose yield stress varies according to the applied electric field strength, which is observed as viscosity variation of the fluid. In applying ER fluid to a SFD, a pair of rings of the damper can be used as electrodes. When the electrodes are divided into a horizontal pair and a vertical one, the SFD can produce damping force in each direction independently. A prototype of the directionally controllable SFD was constructed and its performance was experimentally and numerically investigated in the present work.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 1999년도 춘계종합학술대회
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• pp.276-279
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• 1999

This paper proposes a design for microstrip patch antenna with dual resonance and dual polarization fed by proximity coupled quarter wavelength stub. The antenna characteristics are analyzed by the FDTD method with Mur's 2nd order ABC. From the simulation results based on the FDTD method, frequency characteristics of structure parameters such as the patch size and the offset feed are investigated. The numerical results are compared with the experimental results, and the comparison shows reasonable agreement for a design frequency.

• 타이어
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• 통권114호
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• pp.14-29
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• 1984

본자료는 세계 11개 주요 고무제품제조업체 (그 중 10개사는 82년도 매출액이 각각 10억 달러 이상임)의 재무상황과 최근의 영업실적을 분석한 것이다. 조사편의상 기업체들을 미국ㆍ유럽ㆍ일본의 3개 그룹으로 나누어 자료비교가 가능한 지난 82년도를 기준으로 분석했는데, 동년 총매출액 370억달러 중 미국이 53%, 유럽이 36%, 일본이 11%를 점하였다. 11개 업체는 Goodyear, Michelin,Pirelli, Firestone,Bridgestone, BF Goodrich, Dunlop, General Tire, Uniroyal, Continental, Yokohama 등인데, 이들이 모두 고무산업만을 하는 것은 아니다. 일본의 Sumitomo 사는 1983년에 Dunlop의 영국공장과 서독의 타이어공장을 사들이고, 84년에도 프랑스의 공장을 매입했지만 82년도 매출액이 7억 5,000만 달러에 불과하여 이번 분석대상에서 제외되었다. 각기업체 자료는 가급적 동일한 조건으로 취급하려 했지만, 각사의 정책상비밀로 하는 정보 때문에 제한을 받았다. 비교하기 쉽도록 하기 위하여 모든 금약은 미화 달러 기준으로 하였고, 자료는 대부분 각사의 결산보고서에 따른 것이다.

• Fibers and Polymers
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• 제2권2호
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• pp.58-63
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• 2001

Silk fibroin (SF) was dissolved in calcium chloride/ethanol/water mixture(1/2/8 in mole ratio) at $70^{\circ}C$ for 4h. The dissolved silk fibroin was regenerated by casting the dialyzed solution into films. The films were treated with 50% aqueous solution of methanol for different times, and their antithrombogenicity was evaluated by in vivo tests. In vivo blood tests were made by a method of peripheral vein indwelling suture. It was found that the silk fibroin had a good antithrombogenicity and an absorbability even though the polymer showed foreign body reaction. Finally, the blood compatibilty of silk fibroin films which were subjected to structural change by the methoanl treatment, was examined in connection with their interfacial surface energy, and a correlation between these properties was found to be present.