• Title/Summary/Keyword: Memory efficiency

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A Numerical Study of NAND Flash Memory on the cooling effect (낸드플래시 메모리의 냉각효과에 관한 수치적 연구)

  • Kim, Ki-Jun;Koo, Kyo-Woog;Lim, Hyo-Jae;Lee, Hyouk
    • 한국전산유체공학회:학술대회논문집
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    • 2011.05a
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    • pp.117-123
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    • 2011
  • The low electric power and high efficiency chips are required because of the appearance of smart phones. Also, high-capacity memory chips are needed. e-MMC(embedded Multi-Media Card) for this is defined by JEDEC(Joint Electron Device Engineering Council). The e-MMC memory for research and development is a memory mulit-chip module of 64GB using 16-multilayers of 4GB NAND-flash memory. And it has simplified the chip by using SIP technique. But mulit-chip module generates high heat by higher integration. According to the result of study, whenever semiconductor chip is about 10 $^{\circ}C$ higher than the design temperature it makes the life of the chip shorten more than 50%. Therefore, it is required that we solve the problem of heating value and make the efficiency of e-MMC improved. In this study, geometry of 16-multilayered structure is compared the temperature distribution of four different geometries along the numerical analysis. As a result, it is con finned that a multilayer structure of stair type is more efficient than a multilayer structure of vertical type because a multi-layer structure of stair type is about 9 $^{\circ}C$ lower than a multilayer structure of vertical type.

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Micro Electrochemical Machining Characteristics and Shape Memory Effect in Ni-Ti SMA (Ni-Ti SMA의 미세 전해가공특성과 형상기억효과)

  • 김동환;박규열
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.1
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    • pp.43-49
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    • 2003
  • In this study, micro electrochemical machining method was introduced for accomplishment the fabrication technology of functional parts and smart structures using the Ni-Ti shape memory alloy. From the experimental result, the micro part which has very fine surface could be achieved by use of micro electrochemical process with point electrode method. Concretely, the optimal performance of micro electrochemical process in Ni-Ti SMA was obtained at the condition of approximately 100% of current efficiency and high frequency pulse current. That is, much finer surface integrity and shape memory effect can be obtained at the same condition mentioned above.

Improving Parallel Testing Efficiency of Memory Chips using NOC Interconnect (NOC 인터커넥트를 활용한 메모리 반도체 병렬 테스트 효율성 개선)

  • Hong, Chaneui;Ahn, Jin-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.68 no.2
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    • pp.364-369
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    • 2019
  • Generally, since memory chips should be tested all, considering its volume, the reduction in test time for detecting faults plays an important role in reducing the overall production cost. The parallel testing of chips in one ATE is a competitive solution to solve it. In this paper, NOC is proposed as test interface architecture between DUTs and ATE. Because NOC can be extended freely, there is no limit on the number of DUTs tested at the same time. Thus, more memory can be tested with the same bandwidth of ATE. Furthermore, the proposed NOC-based parallel test method can increase the efficiency of channel usage by packet type data transmission.

Metadata-Based Data Structure Analysis to Optimize Search Speed and Memory Efficiency (검색 속도와 메모리 효율 최적화를 위한 메타데이터 기반 데이터 구조 분석)

  • Kim Se Yeon;Lim Young Hoon
    • The Transactions of the Korea Information Processing Society
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    • v.13 no.7
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    • pp.311-318
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    • 2024
  • As the amount of data increases due to the development of artificial intelligence and the Internet, data management is becoming increasingly important, and the efficient utilization of data retrieval and memory space is crucial. In this study, we investigate how to optimize search speed and memory efficiency by analyzing data structure based on metadata. As a research method, we compared and analyzed the performance of the array, association list, dictionary binary tree, and graph data structures using metadata of photographic images, focusing on temporal and space complexity. Through experimentation, it was confirmed that dictionary data structure performs best in collection speed and graph data structure performs best in search speed when dealing with large-scale image data. We expect the results of this paper to provide practical guidelines for selecting data structures to optimize search speed and memory efficiency for the images data.

Charge Pump Circuits with Low Area and High Power Efficiency for Memory Applications

  • Kang, Kyeong-Pil;Min, Kyeong-Sik
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.6 no.4
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    • pp.257-263
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    • 2006
  • New charge pump circuits with low area and high power efficiency are proposed and verified in this paper. These pump circuits do not suffer the voltage stress higher than $V_{DD}$ across their pumping capacitors. Thus they can use the thin-oxide MOSFETs as the pumping capacitors. Using the thin-oxide capacitors can reduce the area of charge pumps greatly while keeping their driving capability. Comparing the new pump (NCP-2) with the conventional pump circuit using the thick-oxide capacitors shows that the power efficiency of NCP-2 is the same with the conventional one but the area efficiency of NCP-2 is improved as much as 71.8% over the conventional one, when the $V_{PP}/V_{DD}$ ratio is 3.5 and $V_{DD}$=1.8V.

A Study on Efficient Use of Dual Data Memory Banks in Flight Control Computers

  • Cho, Doosan
    • International Journal of Internet, Broadcasting and Communication
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    • v.9 no.1
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    • pp.29-34
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    • 2017
  • Over the past several decades, embedded system and flight control computer technologies have been evolved to meet the diverse needs of the mobile device market. Current embedded systems are at the heart of technologies that can take advantage of small-sized specialized hardware while still providing high-efficiency performance at low cost. One of these key technologies is multiple memory banks. For example, a dual memory bank can provide two times more memory bandwidth in the same memory space. This benefit take lower cost to provide the same bandwidth. However, there is still few software technologies to support the efficient use of multiple memory banks. In this study, we present a technique to efficiently exploit multiple memory banks by software support. Specifically, our technique use an interference graph to optimally allocate data to different memory banks by an optimizing compiler. As a result, the execution time can be improved upto 7% with the proposed technique.

Analysis of GPU Performance and Memory Efficiency according to Task Processing Units (작업 처리 단위 변화에 따른 GPU 성능과 메모리 접근 시간의 관계 분석)

  • Son, Dong Oh;Sim, Gyu Yeon;Kim, Cheol Hong
    • Smart Media Journal
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    • v.4 no.4
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    • pp.56-63
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    • 2015
  • Modern GPU can execute mass parallel computation by exploiting many GPU core. GPGPU architecture, which is one of approaches exploiting outstanding computational resources on GPU, executes general-purpose applications as well as graphics applications, effectively. In this paper, we investigate the impact of memory-efficiency and performance according to number of CTAs(Cooperative Thread Array) on a SM(Streaming Multiprocessors), since the analysis of relation between number of CTA on a SM and them provides inspiration for researchers who study the GPU to improve the performance. Our simulation results show that almost benchmarks increasing the number of CTAs on a SM improve the performance. On the other hand, some benchmarks cannot provide performance improvement. This is because the number of CTAs generated from same kernel is a little or the number of CTAs executed simultaneously is not enough. To precisely classify the analysis of performance according to number of CTA on a SM, we also analyze the relations between performance and memory stall, dram stall due to the interconnect congestion, pipeline stall at the memory stage. We expect that our analysis results help the study to improve the parallelism and memory-efficiency on GPGPU architecture.

A reversible variable length code with an efficient table memory (효율적인 테이블 메모리를 갖는 가역 가변길이 부호)

  • 임선웅;배황식;정정화
    • Proceedings of the IEEK Conference
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    • 2000.06c
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    • pp.133-136
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    • 2000
  • A RVLC(Reversible Variable Length Code) with an efficient table memory is proposed in this paper. In the conventional decoding methods, the weight of symbols and code values are used for the decoding table. These methods can be applied for Huffman decoding. In VLC decoding, many studies have been done for memory efficiency and decoding speed. We propose an improved table construction method for general VLC and RVLC decoding, which uses the transition number of bits within a symbol with an enhanced weight decomposition. In this method, tile table for RVLC decoding can be implemented with a smaller memory

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Low-power memory based FFT structure for high speed UWB (UWB용 저전력 Memory based FFT 구조)

  • Choi, Dong-Kyu;Jang, Young-Beom
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.215-216
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    • 2008
  • Ultra wideband (UWB) system is one of the promising solutions for future short-range communication which has recently received a great attention by many researchers. In this paper, we proposed 128-point low power FFT structure based on the memory for UWB systems. The proposed structure can improve implementation area and power consumption efficiency as it consists of one of the butterfly PE and a little memory.

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Electrical characteristics and pulse memory operation of 3-electrode DC-PDP (3전극 직류형 PDP의 전기적 특성과 펄스 메모리 구동)

  • 명대진;손일헌
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.35D no.7
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    • pp.32-39
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    • 1998
  • This paper presents the experimental results on the 3-electrode DC-PDP which has a common electrode to improve the PDP life cycle. The measured DC characteristic proves the effectiveness of common electrode absorbing about half of discharge currents. The waveforms for pulse memory operation of3-electrode PDP without crosstalk could also be determined from the I-V characteristics. The pulse memory drives of 8*8 cell array show the frequency response fo memory margin and the luminance efficiency of 3-electrode PDP are quite different from genrally known characteristics of 2-electrode DC-PDP.

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