• The Journal of Korean Institute for Practical Engineering Education
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• v.4 no.2
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• pp.129-135
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• 2012

There are many ways in which electric vehicles are mathematically modeled and simulated. The components have different physical background and models, but have to fit into one mathematical model. A multiphysics model structure is required. Depending on the goal of the simulation, there are various levels on which the simulation can be performed. This is called multilevel, consisting of a conceptual system level, a circuit level and a more detailed component level. This paper discusses which multiphysics models and multilevel simulations are required for the various components in an electric vehicle. Also, this simulation approach could improve the effectiveness of learning in engineering education.

• Journal of the Korea Society of Computer and Information
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• v.7 no.2
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• pp.79-86
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• 2002

This paper presents a low power scheduling and allocation algorithm for multiple supply voltage. The proposed supply voltage scheduling algorithm determines the control step to execute a possible the operation experimentally using another supply voltage level. Also, the switching activity using component library. and the supply voltage allocation method uses the graph coloring technique for low power, the proposed algorithm Proves the effect through various high level benchmark examples to adopt a multiple supply voltage scheduling algorithm for low power.

• Proceedings of the Acoustical Society of Korea Conference
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• 1998.08a
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• pp.60-64
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• 1998

음성인식 시스템의 실용화 과정에서 훈련환경과 테스트 환경의 불일치로 인한 인식성능의 저하는 반드시 극복되어야 할 문제이다. 본 논문에서는 잡음 tR인 입력음성의 비음성구간에서 잡음레벨을 추정하여 음성 스펙트럼에서 추정된 잡음레벨을 빼는 스펙트럼 차감법고 스펙트럼 영역에서 미리 정해진 마스킹 레벨보다 낮은 에너지 값을 마스킹 레벨로 올려주는 잡음 마스킹을 함께 사용함으로써 훈련 환경과 테스트환경의 불일치를 줄이는 방법을 제안한다. 그리고 복수의 마스킹 레벨에 대한 모델들을 미리 만들어 두고 추정된 잡음 레벨에 따라 적합한 마스킹 레벨의 보델을 사용하여 인식을 수해？는 다중 모델 방법을 적용하였다. 자동차 소음환경에서 두 가지 마스킹 레벨에 대한 모델을 이용한 화자독립고립단어 인식 실험을 통하여 본 논문에서 제안한 방식은 정차중 무시동 환경에서 95.8%, 정차중 시동 환경에서 95.6%, 한적한 도로환경에서 92.8%, 복잡한 시내도로 환경에서 89.6%, 고속도로 환경에서 74.4%의 인식성능을 나타내었으며, 평균 90.7%의 성능을 얻을 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10b
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• pp.793-795
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• 2003

이 논문은 대용량 단백질 상호작용의 관계를 효과적으로 시각화하기 위해 단백질이 가지고 있는 기능에 기반한 추상화 방법을 제안한다. 제안하는 방법은 FDP(force-directed placement) 알고리즘에 기반을 두고 있지만 다중 레벨 처리를 위해 기능에 기반한 추상화 방법과 확장을 사용한다는 점에서 차이점을 나타낸다. 제안하는 그래프 레이아웃 방법은 추상화, 위치화, 확장의 3부분으로 구성되어 있으며 특히 추상화 부분은 다중 레벨 처리를 포함한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.12 no.5
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• pp.505-518
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• 1987

In this paper, the 2-level and 3-level types of PWM technique have been analyzed, and a multiprocessor has been designed as controller for these two types of PWM inverters. Designed multiprocessor employing a hierarchical structure of a SUPERVISORY PROCESSOR which interconnects three LOCAL PROCESSOR through a common memory technique has showed as elaborate digital control characteristic. Using this multiprocessor configuration the system could gain a great degree of freedom in change of software. Also software was simpler than a single processor configuration.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.28-29
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• 2011

SSD(Solid State Drive)는 다중-채널/ 다중-웨이 방식의 NAND 플래시 메모리를 이용하는 저장장치로서 기존 HDD(Hard Disk Drive)를 대체할 차세대 보조기억장치로 주목받고 있다. 하지만 SSD 와 같은 동작을 하는 커널레벨의 시뮬레이터가 존재하지 않아, 사용자 영역에서부터 실제 NAND 플래시 칩까지의 동작 원리를 파악하기 어렵다. 이러한 문제를 해결하기 위해 본 논문에서는 SSD 시뮬레이터의 설계 및 구현내용을 기술한다. 구현한 SSD 시뮬레이터는 다중-채널/ 다중-웨이 방식의 SSD 전체적인 동작 원리를 리눅스 커널 수준에서 파악할 수 있다. 또한 FTL 개발을 위한 환경을 제공할 뿐만 아니라, 사용자가 다양한 SSD 구조를 설계하여 성능을 예측할 수 있도록 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.12A
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• pp.958-963
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• 2003

Increasing throughput using high order data modulations in the WCDMA downlink requires the elimination of multipath interferences. For this reason, Kenichi Higuchi proposed a multipath interference canceller in WCDMA downlink. However, this paper considers the downlink signal models that only contains code channels for which code information is known to the receiver. WCDMA systems contain code channels for other active users whose code information is unknown to the receiver and these code channels degrade the performance of the multipath interference canceller. Thus, this paper proposes a multipath interference mitigation scheme which removes multipath interference induced by all the code channels within a cell. Simulation results show that the proposed scheme outperforms both the RAKE receiver and the multipath interference canceller in the WCDMA downlink.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.11
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• pp.1946-1953
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• 2006

Because the embedded watermark of luminance component guarantees the extraction of ownership information when the color image is converted to gray scale image, the information of ownership right as to the luminance component is embedded in the luminance-chrominance color space such as YCbCr. Therefore, this paper proposes watermark embedding, extraction and authentication algorithm of color image. which considers the device and performance of multimedia contents service by focusing on the robustness and invisibility of watermark. The color image is converted from RGB color space to YCbCr color space, and then the properties of each component of Y(Luminance), Cb(Color Differences) and Cr(Color Differences) are considered in order to embed, extract and certify multi-level watermark in the frequency domain based on the wavelet. As a result, it can guaranteed the robustness for the JPEG compression and invisibility of watermark for multi-level.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.9C
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• pp.868-875
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• 2003

In this paper, enhanced multiresolution motion estimation(MRME) using reduction of one-pixel shift in wavelet domain is proposed. Conventional multiresolution motion estimation using hierarchical relationship of wavelet coefficient has difficulty for accurate motion estimation due to shift-variant property by decimation process of the wavelet transform. Therefore, to overcome shift-variant property of wavelet coefficient, two level wavelet transform is performed. In order too reduce one-pixel shift on low band signal, S$_4$ band is interpolated by inserting average value. Secondly, one level wavelet transform is applied to the interpolated S$_4$ band. To estimate initial motion vector, block matching algorithm is applied to low band signal S$_{8}$. Multiresolution motion estimation is performed at the rest subbands in low level. According to the experimental results, proposed method showed 1-2dB improvement of PSNR performance at the same bit rate as well as subjective quality compared with the conventional multiresolution motion estimation(MRME) methods and full-search block matching in wavelet domain.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.6
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• pp.619-626
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• 2016

Intrusion detection model detects a intrusion when intrusion behaviour occurred. The model analyzes a variety of intrusion pattern and supports a modeling method to represent for a intrusion pattern efficiently. Particularly, the model defines classes of intrusion pattern and supports modeling method that detects a network level intrusion through multiple hosts for multiple intrusions. In this paper, proposes a multiple intrusion detection model that support a verification method for intrusion detection systems and verifies a safeness of proposed model and compares with other models.