• 대한임베디드공학회논문지
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• 제16권6호
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• pp.247-251
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• 2021

We propose a protocol for Ethernet-based industrial real-time communication networks. In the protocol, the master periodically transmits control frames to all slaves, and the ring-type network topology is selected to achieve high-speed transmission speed. The proposed protocol is implemented in the form of both firmware and Linux kernel modules. To improve the transmission speed, the MAC address table is disabled in the firmware implementation, and the NAPI function of the Ethernet driver is removed in the Linux kernel module implementation. A network experiment environment is built with four ARM processor-based embedded systems and network operation experiments are performed for various frame sizes. From the experimental results, it is verified that the proposed protocol normally operates, and the firmware implementation shows better transmission speed than the Linux kernel module implementation.

• 한국정보처리학회논문지
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• 제7권12호
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• pp.3804-3814
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• 2000

본 논문에서는 실시간 객체 모델인 TMO(Time-triggered Message-triggered Object)에 기반을 둔 실시간 객체지향 프로그램의 시간 제약이 제대로 만족되는가를 시스템 수행 중에 감시하기 위한 모니터의 효과적인 구현 방안에 대하여 논한다. 구현 환경으로 윈도우 OS상의 TMO 프로그램 실행 환경인 WTMOS(Windows TMO System)를 이용하였고, 감시 주체가 되는 수행 시간 모니터의 성능 분석을 위하여 온도 제어를 위한 응용 시스템이 구축되었다. 모니터 대상과 모니터 조건을 TMO 프로그램내에 명시하는 방법과 정의된 모니터의 기능을 WTMOS 내부와 TMO 형태의 응용 객체로 분산시켜서 적은 비용으로 시스템을 구축하는 방법을 제시한다.

• 대한음성학회지:말소리
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• 제65호
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• pp.143-152
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• 2008

This paper focuses on the real time implementation of an adaptive multi-rate (AMR) speech codec, that is a standard speech codec of IMT-2000, using the TMS320VC5510. The series of TMS320VC55x is a 16-bit fixed-point digital signal processor (DSP) having low power consumption for the use of mobile communications by Texas Instruments (TI) corporation. After we analyze the AMR algorithm and source code as well as the structure and I/O of 7MS320VC55x, we carry out optimizing the programs for real time implementation. The implemented AMR speech codec uses 55.2 kbyte for the program memory and 98.3 kbyte for the data memory, and it requires 709,878 clocks, i.e. about 3.5 ms, for processing a frame of 20 ms speech signal.

• 전자공학회논문지B
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• 제30B권5호
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• pp.27-33
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• 1993

This paper describes the hardware implementation of 2-D FIR digital filter for a real-time image processing. Generally, the most time-consuming operation in signal processing is the multiplication operation. To avoid it in digital filter. Pelid and Liu proposed the distributed arithmetic method for the one-dimensional case. The implementation method proposed in this paper is to extend Pelid's method to two-dimensional FIR filter using simple ROM lookup table and to use the technique of pipe lining two main operations of memory access and arithmetic. As a result, the speed of our proposed hardware implementation is two times faster than that of conventional methods and can be close to the real time speed.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1999년도 제14차 학술회의논문집
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• pp.69-72
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• 1999

In this paper, the implementation method for the extending real-time execution in MMS Implementation is proposed. For this, the method of MMS over ATM(Asynchronous Transfer Mode) and IEEE 802.12 network is analyzed. By the analysis of service response time, making the ASIC of encoding and decoding parts are proposed for one of the real time extension in MMS. The main goals of this paper to analyze and propose suitable methods to meet the real time requirements in MMS applied system.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.414-417
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• 1997

Many small-sized real-time kernels do not provide memory management and device drivers, not to mention file management. In this paper, we propose a design and implementation of TCP/IP protocol stack for such small real-time kernels based on [6] where we studied issues to be considered for porting the functionalities of TCP/IP for such small real-time kernels.

• Journal of information and communication convergence engineering
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• 제11권4호
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• pp.298-306
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• 2013

The scale invariant feature transform (SIFT) is an effective algorithm used in object recognition, panorama stitching, and image matching. However, due to its complexity, real-time processing is difficult to achieve with current software approaches. The increasing availability of parallel computers makes parallelizing these tasks an attractive approach. This paper proposes a novel parallel approach for SIFT algorithm implementation using a block filtering technique in a Gaussian convolution process on the SIMD Pixel Processor. This implementation fully exposes the available parallelism of the SIFT algorithm process and exploits the processing and input/output capabilities of the processor, which results in a system that can perform real-time image and video compression. We apply this implementation to images and measure the effectiveness of such an approach. Experimental simulation results indicate that the proposed method is capable of real-time applications, and the result of our parallel approach is outstanding in terms of the processing performance.

• 한국정보통신학회논문지
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• 제9권6호
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• pp.1195-1201
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• 2005

본 논문에서는 무선통신 시스템 적용을 위한 G.729 음성부호화기와 길쌈부호화기(R=1/2, K=9) 비터비 복호기를 하나의 고정 소수점 DSP칩을 이용하여 실시간 구현하였다. 프로그램 구현은 고정 소수점 C 프로그램을 연산결과의 기준으로 활용하였으며, 복잡도의 최적화를 위하여 어셈블 언어로 설계하였다. 최적화 과정을 통하여 구현한 결과는 연산량 측면에서 음성부호화기 24MIPS, 채널부호화기 9MIPS, 프로그램 크기 측면에서 음성 24K words, 채널 4K words가 소요되었으며, 연산의 검증은 테스트 벡터를 이용하여 Bit exact 방법에 의하여 검증하였다. 본 논문의 결과는 기존의 음성/채널 부호화기의 개별적인 칩을 이용한 구현 방법에 비하여 구현의 용이성 및 구현 비용 측면에서 성능 개선이 가능할 것으로 판단된다.

• 한국컴퓨터정보학회논문지
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• 제20권1호
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• pp.1-10
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• 2015

본 논문에서는 기존에 많이 사용되는 복잡한 4단계 화재 감지 알고리즘의 성능을 향상시키기 위해 그래픽스 처리 장치 (GPU)를 이용한 효율적인 병렬 구현 방법을 제안하였고 성능을 분석하였다. 또한 현재 많이 사용되고 있는 7가지 서로 다른 해상도 (QVGA, VGA, SVGA, XGA, SXGA+, UXGA, QXGA)의 비디오를 입력으로 하여 성능을 분석하였다. 더불어 각 해상도별 GPU 기반 실행시간과 고성능 CPU에서의 실행시간을 비교 분석하였다. 각 해상도의 5가지 화재 및 비 화재 비디오를 이용하여 모의 실험한 결과, GPU는 CPU보다 실행시간에서 우수한 성능을 보이는 동시에 FULL HD급의 높은 해상도인 UXGA 영상에서도 프레임 당 25.11ms의 실행시간이 소요되어 초당 30 프레임의 실시간 처리가 가능함을 보였다.

• 한국의료질향상학회지
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• 제9권1호
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• pp.66-73
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• 2002

The current health care system demands provisions for patient care in perspectives of a cost-effectiveness and patient satisfaction. Critical pathway implementation facilitates optimal sequencing and intervention timing of patient care, and makes medical team and patients participate in a treatment actively. In this study, a critical pathway was developed and implemented to patients with osmidrosis who undertake operation. Sixty patients were included in the study. The critical pathway was implemented for care of 26 patients while the traditional care was implemented for 34 patients. In the critical pathway implemented group, time needed for charting and unessential working was reduced. Mean time amount of time for patient nursing was increased. The critical pathway implementation is an effective method to utilize time of medical team. Also it increases the satisfaction index of patients and medical team simultaneously.