• 한국항공운항학회지
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• 제18권1호
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• pp.39-44
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• 2010

A method is presented of dynamic determination of mode transition probability for IMM in order to improve the accuracy performance of maneuvering target tracking for air traffic control surveillance processing system under multiple radar environment. It is shown that dynamic determination of mode transition probability based on the time intervals between the data input from multiple radars gives the optimized performance in terms of position estimation accuracy.

• 방송공학회논문지
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• 제10권3호
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• pp.348-356
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• 2005

본 논문에서는 H.264로 부호화 된 비트스트림을 이전보다 낮은 비트율을 갖는 비트스트림으로 변환시키기 위한 고속 비트율 감축 트랜스코딩을 제안한다. 제안된 트랜스코딩 기법은, 복호기에서 나온 블록 모드 정보와 움직임 벡터를 이용하여, 확률 기반의 블록 모드 결정 기법과 움직임 벡터 재사용 및 정제 기법을 사용하였다. 그 결과, 직렬 화소 영역 트랜스코딩과 비교하였을 때 약 0.1$\∼$0.3 dB 정도의 화질 저하가 있지만, 부호화 시간을 비교하였을 때 약 40배 빠른 결과를 얻었다.

• 반도체디스플레이기술학회지
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• 제13권1호
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• pp.109-112
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• 2014

H.264/AVC is an international video coding standard that is established in cooperation with ITU-T VCEG and ISO/IEC MPEG, which shows improved code and efficiency than the previous video standards. Motion estimation using various macroblock from 44 to 1616 among the compression techniques of H.264/AVC contributes much to high compression efficiency. Generally, in the case of small motion vector or low complexity about P slice is decided $P16{\times}16$ mode encoding method. But according to circumstances, macroblock is decided $P16{\times}16$ mode despite large motion vector. If the motion vector variance is more than threshold and final select mode is $P16{\times}16$ mode, it is switched to $P8{\times}8$ mode, so this paper shows that the storage capacity is reduced. The results of experiment show that the proposed algorithm increases the compression efficiency of the H.264/AVC algorithm to 0.4%, even reducing the time and without increasing complexity.

• 산업공학
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• 제11권1호
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• pp.145-153
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• 1998

In this paper, two parts of neural networks were proposed for determination of optimal EDM parameters. One is pattern recognition neural network that can be selecting expert neural network suitable to the EDM mode. The other is expert neural network that can be determining optimal EDM parameters such as pulse on time and pulse off time. Prior to determination of EDM parameters, Peak current, which is related to the EDM area closely, determined base on EDM area that is calculated from CAD data, firstly. Then, the other EDM parameters determined by the expert neural network that is selected to the EDM mode.

• 대한화장품학회지
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• 제22권2호
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• pp.153-160
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• 1996

A novel simple method to detect vitamins in cosmetic products by gas chromatography-mass spectrometry(GC-MS) has been developed. Three vitamins(panthenol, cholecalciferol and tocopherol) were used for this study. Vitamins were prepared by dissolving in tetrahydrofuran(THF), and silylated with bis-trimethylsilyltrifluoroacetamide-trichloromethylsilane(BSTFA). Silated vitamins were separated on a fuses-silica capillary column coated with DB-5. The identification of each vitamin was accomplished by retention time and mass spectrum library search with a computer, and the quantitation was made in the selected-ion monitoring(SIM) mode of GC-MS. SIM mode had given sensitivity to determine 50pg of panthenol, 285pg of cholecalciferol and 130pg of tocopherol. Linearity was maintained over the range 0.005-0.20% for each vitamin. Each cosmetic product(i.e. hair tonic and lotion) was found to contain amounts of the vitamins. This method was sensitive and gave 77.5-99.9% recovery of each vitamin from these cosmetic products. From these results, we concluded that silylation with BSTFA followed by GC-MS analysis allows the simple, covenient and exact determination of panthenol, cholecalciferol and tocopherol.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.383-386
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• 1998

An application determination of the dominant-mode fields in ridge waveguides at all frequencies has been made. Evaluations of the fields along the walls of a commercially standard single-ridge guide having a usable frequency range from 3.75 to 15.0 Gc, This paper presented the analysis of the mode directive coupling characteristics of two ridge waveguide using mode matching techniques for TE10 mode.

• 한국항공우주학회지
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• 제30권1호
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• pp.82-87
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• 2002

다목적 실용위성과 같은 저궤도 위성에서의 자세결정은 태양획득에서 중요한 문제이다. 특히, 다목적 실용위성의 태양획득 모드에서는 위성의 피치와 요의 각은 태양 센서로 알 수 있기 때문에 위성의 롤 방향만이 태양을 지향하고 있다. 즉, 한 축의 방향을 알고 있을 때 나머지 두 축의 관성 좌표계에 대한 자세를 결정하는 문제가 된다. 본 논문은 일반적인 저궤도 위성의 3축 중에서 한 축의 방향을 알고 있을 때 위성의 자세를 결정하는 새로운 방법을 제시하고 다양한 모의실험을 통해서 그 유용성을 검증한다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.704-713
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• 1993

A principle for the determination of reel stagger, based on reel kinematics and crop stem deflection , is proposed. Equation derived theoretically and information obtained empirically are combined to obtain an algorithm for the determination of reel stagger. The algorithm has yet to be evaluated on actual combine harvesters in the harvesting mode.

• Computers and Concrete
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• 제20권1호
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• pp.39-47
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• 2017

In this paper, mode I fracture toughness of rock was determined by direct and indirect methods using Particle Flow Code simulation. Direct methods are compaction tension (CT) test and hollow centre cracked quadratic sample (HCCQS). Indirect methods are notched Brazilian disk (NBD) specimen, the semi-circular bend (SCB) specimen, hollow centre cracked disc (HCCD), the single edge-notched round bar in bending (SENRBB) specimen and edge notched disk (END). It was determined that which one of indirect fracture toughness values is close to direct one. For this purpose, initially calibration of PFC was undertaken with respect to data obtained from Brazilian laboratory tests to ensure the conformity of the simulated numerical models response. Furthermore, the simulated models in five introduced indirect tests were cross checked with the results from direct tests. By using numerical testing, the failure process was visually observed. Discrete element simulations demonstrated that the macro fractures in models are caused by microscopic tensile breakages on large numbers of bonded discs. Mode I fracture toughness of rock in direct test was less than other tests results. Fracture toughness resulted from semi-circular bend specimen test was close to direct test results. Therefore semi-circular bend specimen can be a proper test for determination of Mode I fracture toughness of rock in absence of direct test.

• 분석과학
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• 제19권3호
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• pp.203-210
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• 2006

Octopole reaction cell inductively coupled plasma mass spectrometer (ORC-ICP-MS)를 이용하여 우유 분말시료 중 극미량의 셀레늄(Se)을 정량하였다. 반응가스로 $H_2$를 사용함으로써 극미량 측정에서 발생되는 다원자 이온 종들과 공존 원소에 의해 발생되는 분자들의 방해를 현저하게 제거하였다. Normal mode에 비해서 $H_2$ cell gas mode는 정확성과 정밀성을 크게 향상시켰으며, 우유 표준시료의 보증 값에 비해 정량한 결과는 평균 102.7%로 약간 높게 나타났고, 5회 정량한 값에 대한 상대표준편차는 7.6%이었다.