• Title/Summary/Keyword: 라이스

Search Result 416, Processing Time 0.022 seconds

Global Positioning System 응용을 위한 파이프라인 형 CORDIC회로 설계

  • 이은균;유영갑
    • The Magazine of the IEIE
    • /
    • v.23 no.11
    • /
    • pp.89-100
    • /
    • 1996
  • A new stage-sliced pipiline structure is presented to design a high speed real time Global Positional Systems(GPS) applications. The CORDIC algorothm was revised to generate a pipeline structure, which will be used to produce a large amount of trigonometric computations rapidly. A stage-sliced approach was introduced to adjust the number of interative processes, and thereby to control the precision of computation results. Both the computation and the control circuits of the proposed architecture are included in a pipeline stage, which are intergrated into a stage slice. The circuit was prototyped using six FPGA chips : one is used for glue logics and five of the chips are used for pipeline slice implementation. A single FPGA chip comprising 7 pipeline stages provides one pipeline slice. To compensate and inter-slice time delay, dummy cycles are introduced in inter-slice signal exchanges.

  • PDF

An Efficient Rendering Method for Anisotropic Volume Data in 3D Medical Imaging (3차원 의학영상 처리에서 사용되는 비균등 볼륨 데이터를 위한 효율적인 렌더링 방법)

  • 김태영;신병석
    • Journal of Biomedical Engineering Research
    • /
    • v.23 no.6
    • /
    • pp.491-498
    • /
    • 2002
  • In medical visualization fields, anisotropic volume data are more common than isotropic ones. In this paper, we propose an efficient rendering method for anisotropic volume data, which directly computes the intensity of intermediate samples by interpolating the intensity of two corresponding voxels on consecutive slices. Unlike conventional rendering method, it does not require a preprocessing step for generating intermediate slices or additional memory for storing them. In order to evaluate the validity and performance of our method, we applied the method to shear-warp rendering algorithm. Experimental results show that this method improves rendering speed without significantly sacrificing the image quality.

A Slice-based Complexity Measure (슬라이스 기반 복잡도 척도)

  • Moon, Yu-Mi;Choi, Wan-Kyoo;Lee, Sung-Joo
    • The KIPS Transactions:PartD
    • /
    • v.8D no.3
    • /
    • pp.257-264
    • /
    • 2001
  • We developed a SIFG (Slice-based Information Graph), which modelled the information flow on program on the basis of the information flow of data tokens on data slices. Then we defied a SCM (Slice-based complexity measure), which measured the program complexity by measuring the complexity of information flow on SIFG. SCM satisfied the necessary properties for complexity measure proposed by Briand et al. SCM could measure not only the control and data flow on program but also the physical size of program unlike the existing measures.

  • PDF

Time-slice Donation Technique for Improving the Performance of IPC in Linux (Linux의 IPC 성능 향상을 위한 타임 슬라이스 공여 기법)

  • Lee, Ji-Hoon;Youn, Hee-Yong
    • Journal of KIISE:Computer Systems and Theory
    • /
    • v.37 no.6
    • /
    • pp.339-347
    • /
    • 2010
  • Inter-process communication (IPC), which is a technique that enables exchanging data among multiple processes, is commonly used not only in user applications but also in system processes. For this reason, the performance of IPC highly influences the performance of whole computer system. Especially, heavy overload on a single server process caused by IPC requests from multiple client processes, easily results overall slowdown of IPC response time. Here, to deal with the problem stated above, the time-slice donation technique which is adapted in L4 microkernel is analyzed and enhanced for reducing latency of IPC response time and implemented on linux kernel for actual performance evaluation. While trying to maintain the additional overhead as least as possible, the experiment shows that the use of this technique enhances the performance of IPC multiple times of existing technique under certain circumstances.

A Low-Power 2-D DCT/IDCT Architecture through Dynamic Control of Data Driven and Fine-Grain Partitioned Bit-Slices (데이터에 의한 구동과 세분화된 비트-슬라이스의 동적제어를 통한 저전력 2-D DCT/IDCT 구조)

  • Kim Kyeounsoo;Ryu Dae-Hyun
    • Journal of Korea Multimedia Society
    • /
    • v.8 no.2
    • /
    • pp.201-210
    • /
    • 2005
  • This paper proposes a power efficient 2-dimensional DCT/IDCT architecture driven by input data to be processed. The architecture achieves low power by taking advantage of the typically large fraction of zero and small-valued input processing data in video and image data compression. In particular, it skips multiplication by zero and dynamically activates/deactivates required bit-slices of fine-grain bit partitioned adders within multipliers and accumulators using simple input ANDing and bit-slice MASKing. The processed results from 1-D DCT/IDCT do not have unnecessary sign extension bits (SEBs), which are used for further power reduction in matrix transposer. The results extracted by bit-level transition activity simulations indicate significant power reduction compared to conventional designs.

  • PDF

Interframe Coding of 3-D Medical Image Using Warping Prediction (Warping을 이용한 움직임 보상을 통한 3차원 의료 영상의 압축)

  • So, Yun-Sung;Cho, Hyun-Duck;Kim, Jong-Hyo;Ra, Jong-Beom
    • Journal of Biomedical Engineering Research
    • /
    • v.18 no.3
    • /
    • pp.223-231
    • /
    • 1997
  • In this paper, an interframe coding method for volumetric medical images is proposed. By treating interslice variations as the motion of bones or tissues, we use the motion compensation (MC) technique to predict the current frame from the previous frame. Instead of a block matching algorithm (BMA), which is the most common motion estimation (ME) algorithm in video coding, image warping with biolinear transformation has been suggested to predict complex interslice object variation in medical images. When an object disappears between slices, however, warping prediction has poor performance. In order to overcome this drawback, an overlapped block motion compensation (OBMC) technique is combined with carping prediction. Motion compensated residual images are then encoded by using an embedded zerotree wavelet (EZW) coder with small modification for consistent quality of reconstructed images. The experimental results show that the interframe coding suing warping prediction provides better performance compared with interframe coding, and the OBMC scheme gives some additional improvement over the warping-only MC method.

  • PDF

Dynamic voltage scaling policy for processors with fast voltage transition on personal computing environment (이동형 개인 컴퓨팅 환경의 에너지 효율 증가를 위한 빠른 전압 조절을 고려한 가변 성능 알고리즘)

  • Seo, Eui-Seong;Lee, Joon-Won
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2005.07a
    • /
    • pp.763-765
    • /
    • 2005
  • DVS(dynamic voltage sealing)은 이동형 프로세서에서 에너지 효율을 높이기 위한 필수 요소로 자리 잡고있다. DVS를 효과적으로 사용하기 위해선 대상 태스크의 특성과 하드웨어 특성에 맞는 DVS 알고리즘이 필요하다. 상품화 수준의 않은 운영체계들이 일정한 인터벌(interval)을 바탕으로 시스템 사용 상황을 분석하여 목표 성능을 결정하는 방식을 사용하고 있다. 이러한 방식은 태스크의 특성이 갑자기 변하여 성능을 요구할 경우 인터벌만큼의 시간이 진행된 후에야 반응 한다는 단점이 있다. 또한, 태스크 별 특성이 아닌 시스템 전체의 특성을 따르므로 이질적인 성격의 태스크들이 동시에 실행 되는 환경에는 적합하지 않다. 최근의 모바일 프로세서들은 수 마이크로초 수준의 성능 전환 시간을 제공하고 있으며 이 속도는 계속 줄어들고 있다. 프로세서의 고성능화로 인해 I/O 작업의 경우 프로세서 성능에 따른 실행 시간의 차이가 존재 하지 않는다. 이러한 두 가지 특성을 바탕으로 우리는 TIB(timer interrupt based) 알고리즘을 제안한다. TIB 알고리즘은 일정한 길이의 인터벌 대신 타임 슬라이스(time slice)를 성능 결정의 단위로 삼는다. 성능의 결정은 태스크 별로 이루어지며 각 태스크가 사용했던 이전 타임 슬라이스가 타이머 인터룹트(timer interrupt)에 의해 끝났다면 최대의 성능을 그 외의 경우는 최저의 성능으로 실행하게 된다. 이러한 접근 방식을 통해 I/O 작업이나 이벤트를 기다리는 태스크에 대해 최저 성능을 제공함으로써 실행 시간의 적은 손해를 대가로 많은 에너지 절감을 이룰 수 있다. 또한, 태스크의 속성이 변한 경우 타임 슬라이스 길이 만큼의 지체만을 허용하게 된다. 이러한 TIB 인터벌에 기반한 알고리즘에 비해 개별 태스크의 특성에 따른 성능 조절과 태스크의 변화에 따른 빠른 반응을 자랑으로 한다. 본 논문에선 TIB 알고리즘을 리눅스 커널에 구현하여 성능을 평가하였고 그 결과 리눅스에서 사용되는 기존 인터벌 기반의 알고리즘들에 비해 좋은 전력 절감 효과를 얻을 수 있었다.

  • PDF

Characteristics of Pop-rice and Rice Tea Using Black Sticky Rice with Giant Embryo (흑찰거대배아미를 이용한 팝라이스와 흑미차의 품질 특성)

  • Han, Sang-Ik;Seo, Woo Duck;Na, Ji-Eun;Park, Ji-Young;Park, Dong-Soo;Cho, Jun-Hyun;Lee, Jong-Hee;Seo, Kyung-Hye;Sim, Eun-Yeong;Nam, Min-Hee
    • Journal of Life Science
    • /
    • v.25 no.1
    • /
    • pp.68-74
    • /
    • 2015
  • Recently developed black waxy rice with a giant embryo ('Nunkeunheukchal', BGE) was selected and processed to produce high quality nutritional food. BGE contains high levels of several phytochemicals with antioxidant activities, as well as other reported health beneficial properties. In addition, the giant embryo has high protein, lipid, and amino acids contents. Within the free amino acids, ${\gamma}$-aminobutyric acid (GABA), a major inhibitory neurotransmitter, has long been used for treating the aftereffects of brain injuries and stroke. A method for manufacturing pop-rice and black rice tea by popping process in BGE is provided to increase a taste, nutrition and functionality. The produced 'pop-rice' showed increased protein (11.3%) and lipid (3.7%) contents compared with control variety, IB ('Ilmibyeo'). In addition, melanoidin related products, polyphenol and functional amino acid contents were increased by the popping process. Pop-rice tea made of BGE showed the highest extraction of total sugar, glucose, raffinose and sucrose (4 times higher than brown rice) by hot water. Scavenging activity ($SC_{50}$) of processed BGE rice powder showed strong antioxidative activity of 0.24 mg/ml using DPPH and 1.82 mg/ml using ABTs method. Thereafter, these results suggested that the popping processed rice of BGE could be one of the promising materials for healthy food development.

Quality Changes of Minimally Processed Sliced Deodeok (Codonopsis lanceolata) during Storage by Packaging Method (포장방법 차이에 따른 신선편이 슬라이스 더덕의 저장 중 품질 변화)

  • Choi, Duck-Joo;Lee, Yun-Jung;Kim, Youn-Kyeong;Kim, Mun-Ho;Choi, So-Rye;Park, In-Seon;Cha, Hwan-Soo;Youn, Aye-Ree
    • Food Science and Preservation
    • /
    • v.19 no.5
    • /
    • pp.626-632
    • /
    • 2012
  • In this study, the changes that occurred in the quality of minimally processed sliced Deodeok (Codonopsis lanceolata) in relation to the packing method during storage at $7^{\circ}C$ were investigated. The storage tests were conducted for seven days using PE sealing, but PP sealing and vacuum packaging preserved the Deodeok for 14 days. On the seventh day, the vinyl-packaged Deodeok showed a remarkable fall in quality with 4.5 °Brix, but the PP-sealed and vacuum-packaged Deodeok showed slight falls with 6.4 and $6.8^{\circ}Brix$, respectively. The PE- and PP-sealed Deodeok did not show significant differences in texture and moisture content for two days, and the moisture content was highest in the vacuum-packaged Deodeok during storage. In relation to the total viable cell and the coliform count, the vacuum-packaged Deodeok showed the lowest rate of increment during storage, followed by the others. Thus, the bubble-washed and vacuum-packaged minimally processed sliced Deodeok was found to have the best quality.