• Journal of the Korean Ceramic Society
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• v.33 no.8
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• pp.889-894
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• 1996

This study was subjected to the stabilization of heavy metals using DSp cement. Heavy metal Cr and Pb ions were mixed with cement paste and hydration behavior and leaching property by heavy metal were exami-ned. It was found that, Cr ion accelerated the early hydration of the cement and has no accelerating effect in later hydration period. However Pb ion retarded the hydration of the cement for a early hydration periods. As a result of leaching test the quantity of leachant has a very low value and the influence of leached heavy metal effected on the environments is very weak.

• Proceedings of the IEEK Conference
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• 2003.11a
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• pp.69-72
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• 2003

본 논문에서는 범용 DSP를 이용한 잡음환경에 강인한 음성인식 시스템을 구현하였다. 구현된 시스템은 TI사의 범용 DSP인 TMS320C32를 이용하였고, 실시간 음성 입력을 위한 음성 Codec과 외부 인터페이스를 확장하여 인식결과를 출력하도록 구성하였다. 또한, 기존의 음성 인식 시스템에 사용한 파라메터에 대한 고찰과 ICA를 이용하여 잡음 환경에 강인한 음성 특징 파라메터를 제안하고 성능 비교 실험을 하였다. 제안된 ICA 파라메터를 적용하여 음성인식 시스템을 구현하였다. 그리고, 독립적으로 동작 가능한 음성인식 시스템의 응용 예로 무선자동차에 적용시켜 실험했다.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.517-520
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• 2003

Orthogonal Frequency Division Multiplexing (OFDM) is a promising technology for high speed multimedia communication in a frequency selective multipath channel. In this paper, Software IPs for the synchronizer of IEEE 802.11a Wireless LAN system are designed and optimized for TI's TMS320C6201 fixed point DSP. As a result of the execution cycles of the target DSP for each functions of the system, an efficient HW/SW partitioning method can be considered.

• Proceedings of the KIPE Conference
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• 2006.06a
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• pp.140-142
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• 2006

This paper represents a digital parallel control of a synchronous buck converter using a digital signal processor (DSP). The digital PWM and load sharing controller is implemented in the DSP TMS320F2812 and the experimental results are provided to show the feasibility of the digital synchronous buck regulator.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.135-135
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• 2000

In this Paper. the DSP implementation of induction motor drive is Presented on the viewpoint of the design and experiment. The speed estimation of control system for induction motor drive is designed on the base of neural network speed estimator. This neural network speed estimator is experimentally applied to the induction motor system. This system Provides the satisfactory results.

• The Journal of the Acoustical Society of Korea
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• v.5 no.2
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• pp.19-28
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• 1986

DSP LSE을 이용하여 디지털 DTMF 수신기를 구현하는 방법으로는 IIR 디지털 필터, Counter 방법, DFT 방법, FFT 방법 및 PARCOR 방법등이 제안되어 왔다. 그 중에서도 IIR 디지털 필터를 이용 한 방법은 기존의 아나로그 DTME 수신기를 그대로 디지털화 한 것이기 때문에 성능이 제일 우수한 것 으로 알려져 있다. 그러나 IIR 디지털 필터를 이용하여 그것을 구현할 때 필터의 계수, roundoff 잡음, overflow 등 고려해야 할 사항이 많다. 본 논문에서는 이러한 문제점들을 해결하면서 CCITT 사양들을 만족하는 디지털 DTMF 수신기 구현에 관한 연구결과를 제시하였다. DSP LSI을 이용해서 수신기를 hardware 제작할 때 이 결과들을 수정없이 이용할 수 있다고 기대된다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.316-318
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• 2003

JPEG 2000표준을 이용하여 계산상 효율적이면서도 DSP에 적합한 영상 압축 알고리즘을 개발한다. 개발될 기법이 갖는 가장 큰 장점은 비교적 복잡한 연산량을 필요로 하여 실시간 동영상 부호화기에 사용되지 못하고 있는 JPEG 2000 알고리즘을 DSP에 맞게 구현함으로써 고화질의 동영상을 실시간으로 처리할 수 있게 한다. 또한 사용자의 요구 및 사양에 맞추어 보다 효과적으로 컨텐츠를 제공하기 위해, 시, 공간적 스케일러비티를 지원하는 코덱을 개발하여 사용자의 요구와 필요 서비스에 따라 적절한 품질의 비디오를 제공함으로써 더 많은 응용에 쉽게 적용시킬 수 있는 방법들을 제시한다.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.40 no.3
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• pp.208-214
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• 2003

Because the digital control includes microprocessor different from an analog control, the digital control enables to monitor internal parameters of DC-DC converter and to control output voltage remotely by communicating with a Window based PC and also to monitor whether exact voltage is output or not. These things are impossible in an analog control. In this paper, a simple buck converter controlled by DSP(TMS320C31) is implemented. This converter outputs 0V to 5V from 15V input voltage and is controlled by a PD algorithm using DSP. Finally the response characteristics of a step reference voltage and in a steady state are analyzed to verify the usefulness of this digital controlled converter.

• The Journal of the Acoustical Society of Korea
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• v.22 no.4
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• pp.276-285
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• 2003

In this paper, we present real-time implementation of a R2MFC/DTMF (R2 Multi Frequency Combinations/Dual Tone Multiple Frequency) tone receiver/sender using a high performance DSP (Digital Signal Processor) and apply it to a carrier class VoIP (Voice over Internet Protocol) gateway system. The Receiver utilizes the Goertzel filter and the sender adopts the harmonic resonant filter. We describe, in detail, the techniques of multi-channel real-time implementation on a Texas Instruments TMS320C62x DSP such as effective PCM (Pulse Code Modulation) in/out by means of DMA (Direct Memory Access) and McBSP (Multi Channel Buffered Serial Port) and message communication via HPI (Host Port Interface), etc. From experimental results, we confirmed that the optimized code provided 780 channel capacity at 250㎒ C6202, and the our R2MFC/DTMF receiver/sender met ITU-T (International Telecommunication Union-Telecommunication) specifications.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.897-900
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• 2007

This paper presents a study on the DSP controller and IGBT inverter driver design for the power-by-wire(PBW) system using BLDC servo motor. This BLDC servo motor system was realized with DSP(Digital Signal Processor) and IGBT inveter module. The PBW system needs speed control of servo motor for linear thrust action. This paper implements a servo controller with vector control and min-max PWM technique. As CPU of controller, TMS320F2812 DSP was adopted because it has PWM(Pulse Width Modulation) waveform generator, A/D(Analog to Digital) converter, SPI( Serial Peripheral Interface) port and many input/output port etc.