• International Journal of Fuzzy Logic and Intelligent Systems
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• 제15권1호
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• pp.1-11
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• 2015

A concept of Deep Level Situation Understanding is proposed to realize human-like natural communication (called casual communication) among multi-agent (e.g., humans and robots/machines), where the deep level situation understanding consists of surface level understanding (such as gesture/posture understanding, facial expression understanding, speech/voice understanding), emotion understanding, intention understanding, and atmosphere understanding by applying customized knowledge of each agent and by taking considerations of thoughtfulness. The proposal aims to reduce burden of humans in humans-robots interaction, so as to realize harmonious communication by excluding unnecessary troubles or misunderstandings among agents, and finally helps to create a peaceful, happy, and prosperous humans-robots society. A simulated experiment is carried out to validate the deep level situation understanding system on a scenario where meeting-room reservation is done between a human employee and a secretary-robot. The proposed deep level situation understanding system aims to be applied in service robot systems for smoothing the communication and avoiding misunderstanding among agents.

• 한국위성정보통신학회논문지
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• 제9권4호
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• pp.73-76
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• 2014

멀티 코어 프로세서의 보급 확산으로 최근에는 임베디드 시스템에서도 채택되고 있다. 따라서 일반적으로 대규모의 컴퓨팅과 메모리 접근을 필요로 하는 멀티미디어 응용은 멀티 코어 플랫폼 기반의 병렬화가 가능하다. 본 논문에서는 멀티 코어 CPU을 이용한 효율적 색 공간 변환을 위한 스레드 수준 병렬 기법의 성능 향상을 검증하였다. 스레드 수준 병렬화 특히 멀티 코어 프로세서기반 공유 메모리 컴퓨팅 시스템에서는 매우 유용한 병렬 처리 패러다임이 되고 있다. 본 구현에서 스레드 수준 병렬화는 각 스레드에 다른 입력 픽셀을 할당하여 실행하였다. 성능 평가를 위해 직렬 및 병렬 구현들 사이의 처리 속도의 비교에 기초하여 대표적 멀티 코어 프로세서에서 색 변환을 위한 성능 향상 정도를 평가하였다. 결과는 스레드 수준의 병렬 구현에 관계없이 다른 멀티 코어에서 전반적으로 비슷한 성능 향상의 비율을 보여주었다.

• 전력전자학회논문지
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• 제17권4호
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• pp.291-297
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• 2012

Recently, Switching devices become cheaper, depending on the multi-level inverters are considered as the power-conversion systems for high-power and power-quality demanding applications. The multi-level inverters can reduce the THD(Total Harmonic Distortion) as the output which is similar sinusoidal waveform by synthesizing several capacitor DC voltages. However it has some disadvantages such as increased number of components, complex PWM control method. Therefore, this paper is proposed the new multi-level inverter topology using an new H-bridge output stage with a bidirectional auxiliary switch. The proposed topology is the 4-level 3-phase PWM inverter with less switching part than conventional multi-level inverters and reactive power control possible. In order to understand the new multi-level inverter, topology analysis and switching patterns and modes according to the current loop are described in this paper. The proposed multi-level inverter topology is validated through PSIM simulation and the experimental results are provided from a prototype.

• Bulletin of the Korean Chemical Society
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• 제34권11호
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• pp.3265-3268
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• 2013

The multi-hydrogen bonded systems with the solvated electrons are investigated at the B3LYP/6-311++$G^{**}$ basis set level. The symmetrical linear geometrical characteristic is common for the dimer systems, while for the tetramer system, the tetrahedron configuration is generated. The NBO charge analyses demonstrate that the multi-hydrogen-multi-electron (mH-ne) coupling exist in these anion systems, as is supported by the electrostatic potential and the molecular orbital analyses. The positive chemical shift value of the central hydrogen ($H_c$) and the negative chemical shift value of the terminal hydrogen ($H_t$) indicate that the $H_c$ is electronegative while the $H_t$ is electropositive, respectively. Strong coupling between two central hydrogen atoms is demonstrated by the large spin-spin coupling constants. The solvated electron donates significant contributions for the stability of these systems.

• 대한전기학회논문지:시스템및제어부문D
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• 제49권11호
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• pp.637-642
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• 2000

IEEE 1149.1 boundary scan architecture is used as a standard in board-level system testing. The simplicity of this architecture is an advantage in system testing, but at the same time, it it makes a limitation of applications. Because of several problems such as 3-state net conflicts, or ambiguity issues, interconnect testing for multi-drop multi-board systems is more difficult than that of single board systems. A new approach using IEEE 1149.1 boundary scan architecture for multi-drop multi-board systems is developed in this paper. Adding boundary scan cells on backplane bus lines, each board has a complete scan-chain for interconnect test. This new scan-path insertion method on backplane bus using limited 1149.1 test bus less area overhead and mord efficient than previous approaches.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1229-1232
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• 1996

This paper proposes the passive redundancy algorithm of multi-controller structure applicable to the steam generator level control system in the low power operating range. In the passive redundancy scheme of multi-controller structure, two suitable controllers exist if the plant is strongly stabilizable. One of the two controllers can be selected arbitrarily only if it is stable. In particular, this paper shows that the passive redundancy scheme can be efficiently used with PID and GPC control algorithms through simulation studies on the control of the steam generator.

• 한국경영과학회지
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• 제11권1호
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• pp.44-50
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• 1986

In this paper, we find optimal policy for the (Q, r) inventory model under the lead time uncertainty. The (Q, r) inventory model is such that the fixed order quantity Q is placed whenever the level of on hand stock reaches the reorder point r. We first develop the single level inventory model as the basis for the analysis multi-level distribution systems. The functional problem is to determine when and how much to order in order to minimize the expected total cost per unit time, which includes the set up, inventory holding and inventory shortage cost. The model, then, is extended to the multi-level distribution system consisting of the factory, warehouses and retailers. In this case, we also find an optimal policy which minimizes the total cost of the contralized multi-level distribution system.

• IEIE Transactions on Smart Processing and Computing
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• 제5권1호
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• pp.17-21
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• 2016

This paper investigates the importance of the computational overhead when machine learning methods, such as SVM, LASSO, AdaBoosting and AdaBagging, are used for automatic security classification.

• Journal of Power Electronics
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• 제15권6호
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• pp.1508-1516
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• 2015

A single phase H-bridge inverter is employed in conventional Inductive Power Transfer (IPT) systems as the primary side power supply. These systems may not be suitable for some high power applications, due to the constraints of the power electronic devices and the cost. A high-frequency cascaded multi-level inverter employed in IPT systems, which is suitable for high power applications, is presented in this paper. The Phase Shift Pulse Width Modulation (PS-PWM) method is proposed to realize power regulation and selective harmonic elimination. Explicit solutions against phase shift angle and pulse width are given according to the constraints of the selective harmonic elimination equation and the required voltage to avoid solving non-linear transcendental equations. The validity of the proposed control approach is verified by the experimental results obtained with a 2kW prototype system. This approach is expected to be useful for high power IPT applications, and the output power of each H-bridge unit is identical by the proposed approach.

• 조명전기설비학회논문지
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• 제23권12호
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• pp.136-145
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• 2009

고속 철도 추진시스템의 고속화 및 급전시스템의 전력 품질향상을 위한 연구가 현재 활발히 진행되고 있으며 이를 위한 멀티레벨 전력변환기를 적용한 고속전철 추진시스템의 연구가 필요하다. 본 논문은 멀티레벨 전력변환기의 제어기법 및 공간전압벡터 변조기법(Space Vector PWM, SVPWM)의 모델을 제안한다. 단상 컨버터 제어방식으로는 널리 사용되고 있는 순시치 전류제어 방식을 대신하여, 과도상태 개선 및 제어 속응성을 향상시키기 위하여 동기좌표계에서의 전류 제어 방식을 사용한 제어기법을 적용하였으며, 단상 멜티레벨 컨버터 및 3레벨 인버터에 적용되는 SVPWM기법의 시뮬레이션 모델을 제안하고 인버터 축소모델을 통하여 모델링의 타당성을 보인다.