• Title/Summary/Keyword: Korea Design Standard

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10Gb/s CMOS Transimpedance Amplifier Designs for Optical Communications (광통신용 10Gb/s CMOS 전치증폭기 설계)

  • Sim, Su-Jeong;Park, Sung-Min
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.43 no.10 s.352
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    • pp.1-9
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    • 2006
  • In this paper, a couple of 10Gb/s transimpedance amplifiers are realized in a 0.18um standard CMOS technology for optical communication applications. First, the voltage-mode inverter TIA(I-TIA) exploits inverter input configuration to achieve larger effective gm, thus reducing the input impedance and increasing the bandwidth. I-TIA demonstrates $56dB{\Omega}$ transimpedance gain, 14GHz bandwidth for 0.25pF photodiode capacitance, and -16.5dBm optical sensitivity for 0.5A/W responsivity, 9dB extinction ration and $10^{-12}$ BER. However, both its inherent parasitic capacitance and the package parasitics deteriorate the bandwidth significantly, thus mandating very judicious circuit design. Meanwhile, the current-mode RGC TIA incorporates the regulated cascade input configuration, and thus isolates the large input parasitic capacitance from the bandwidth determination more effectively than the voltage-mode TIA. Also, the parasitic components give much less impact on its bandwidth. RGC TIA provides $60dB{\Omega}$ transimpedance gain, 10GHz bandwidth for 0.25pF photodiode capacitance, and -15.7dBm optical sensitivity for 0.5A/W responsivity, 9dB extinction ration and $10^{-12}$ BER. Main drawback is the power dissipation which is 4.5 times larger than the I-TIA.

Design of Asynchronous System Bus Wrappers based on a Hybrid Ternary Data Encoding Scheme (하이브리드 터너리 데이터 인코딩 기반의 비동기식 시스템 버스 래퍼 설계)

  • Lim, Young-Il;Lee, Je-Hoon;Lee, Seung-Sook;Cho, Kyoung-Rok
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.44 no.1
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    • pp.36-44
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    • 2007
  • This paper presented a hybrid ternary encoding scheme using 3-valued logic. It can adapt to the delay-insensitive(DI) model. We designed an asynchronous wrapper for the hybrid ternary encoding scheme to communicate with various asynchronous encoding schemes. It reduced about 50% of transmission lines and power consumption compared with the conventional 1-of-4 and ternary encoding scheme. The proposed wrappers were designed and simulated using the $0.18-{\mu}m$ standard CMOS technology. As a result, the asynchronous wrapper operated over 2 GHz communicating with a system bus. Moreover, the power dissipation of the system bus adapted the hybrid ternary encoding logic decreases 65%, 43%, and 36% of the dual-rail, 1-of-4, and ternary encoding scheme, respectively. The proposed data encoding scheme and the wrapper circuit can be useful for asynchronous high-speed and low-power asynchronous interface.

A Weight Analysis for Measuring the Management Performance of Strategic Business Units of Large Construction Companies (대형건설기업의 경영성과 측정을 위한 전략사업본부 비중분석)

  • Lee, Dong-Hoon;Park, Hye-Sung;Kim, Jung-Chul;Kim, Sun-Kuk
    • Journal of the Korea Institute of Building Construction
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    • v.13 no.6
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    • pp.530-540
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    • 2013
  • The business environment that affects the management performance can be characterized by each Strategic Business Unit (SBU) since construction companies win overseas contracts due to the fairly good construction situations while experience a decline in the local housing market. Environmental changes can alter the strategic importance of the SBU when measuring the management performance. However, large construction companies apply BSC (Balanced Score Card) for collective calculation to determine the management performance, making it difficult to reflect the strategic importance of SBU. This method may create a distorted image of management performance that fails to take environmental changes into consideration, and as such it needs to be improved. Yet, there are no studies on the weight of each SBU considering environmental changes. Thus, the current study intends to analyze the weight of SBU for company-wide measurement of the performance of large construction companies. In addition, a model for analysis of SBU importance is proposed to respond to the constantly changing environmental situations and to modify the weight. For analysis of SBU weight, a questionnaire was conducted with 23 experts and hands-on workers, and the questionnaire result was quantitatively analyzed by applying the FD-AHP method. It is expected that the result will enable a model to be proposed to calculate the weight per division in a manner that reflects environmental changes and minimizes strategic distortion when measuring the management performance of large construction companies.

Challenges in Construction of Omics data integration, and its standardization (농생명 오믹스데이터 통합 및 표준화)

  • Kim, Do-Wan;Lee, Tae-Ho;Kim, Chang-Kug;Seol, Young-Joo;Lee, Dong-Jun;Oh, Jae-Hyeon;Beak, Jung-Ho;Kim, Juna;Lee, Hong-Ro
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.05a
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    • pp.768-770
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    • 2015
  • We performed integration and standardization of the omics data related agriculture. To do this, we requires progressed computational methods and bioinformatics infrastructures for integration, standardization, mining, and analysis. It makes easier biological knowledge to find. we potentialize registration a row and processed data in NABIC (National Agricultural Biotechnology Information Center) and its processed analysis results were offered related researchers. And we also provided various analysis pipelines, NGS analysis (Reference assembly, RNA-seq), GWAS, Microbial community analysis. In addition, the our system was carried out based on the design and build the quality assurance in management omics information system and constructed the infrastructure for utilization of omics analyze system. We carried out major improvement quality of omics information system. First is Improvement quality of registration category for omics based information. Second is data processing and development platform for web UI about related omics data. Third is development of proprietary management information for omics registration database. Forth is management and development of the statistics module producers about omics data. Last is Improvement the standard upload/ download module for Large omics Registration information.

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Implementation of ATM/Internet Gateway System for Real Time Multimedia Service (실시간 멀티미디어 서비스를 위한 ATM/Internet 게이트웨이 시스템의 구현)

  • Han Tae-Man;Jeong You-Hyeon;Kim Dong-Won
    • The KIPS Transactions:PartC
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    • v.11C no.6 s.95
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    • pp.799-806
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    • 2004
  • A growing diversity of pervasive devices is gaming access to the Internet and other information. However, much of the rich multimedia contents cannot be easily handled by the client devices because of the limited communication, processing, storage and display capabilities. The in-tegration of voice, data and video service modified the target of networking technologies. Networks must have some the capabilities for in-tegration of various services and also for QoS support as required by each of those service. Because of these reasons, we developed EAGIS(Efficient ATM Gateway for real time Internet Service) to provide seamless multimedia service between the ATM network and the Internet. EAGIS consists of the interworking unit, content server, transcoding server, and the serveice broker to provide seamless multimedia service be-tween the ATM network and the Internet. In this paper, we design the architecture and transcoding service scenario of the EAGIS. When the RTP is used for the bi-directional communication, transcoding time is configured by the time-stamp of RTCP. When HTTP is used for unidirec-tional communication, self-timer is used. By using these reference time, standard transcoding method is applicable according to the frame trans-mission rate and network traffic load. And we can also assure the QoS of the multiple users` effective bandwidth by our algorithm.

Estimation of Undrained Shear Strength Using Piezocone Test (피에조 콘 시험을 이용한 점성토의 비배수 강도 추정)

  • 박용원;구남실;이상익
    • Journal of the Korean Geotechnical Society
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    • v.19 no.6
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    • pp.169-179
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    • 2003
  • Undrained shear strength of clay deposit is one of the most important properties in the design of geotechnical structures. The use of piezocone test is rapidly growing due to its merit that can measure the in-situ undrained shear strength continuously with less error. The reliability of the shear strength from piezocone test depends upon the cone factor applied. Many researchers have suggested different ranges of values for the factors. This study performs to find out the validity of the suggested values in Korea and their charateristics related to the mechanical properties of clay. Piezocone tests were performed at the site of pilot project of ground improvement at Yangsan-Mulgeum Gyeongnam to investigate the charateristics of piezocone factors. The piezocone fators$(N_{kt}, N_{ke}, N_{\Delta u})$ based on the undrained shear strength from quick triaxial compression test are generally within the suggested range. And there appears considerable relations between undrained shear strength and $(N_{kt}, N_{ke}, N_{\Delta u})$ and between preconsolidation pressure and $(N_{kt}, N_{ke})$, while plasticity index, rigidity index and friction ratio do not show any relations with cone factors. The results also reveal that factor $(N_{\Delta u})$ shows higher reliability than factors $(N_{kt} and N_{ke})$, which show smaller standard deviation, breadth of change and scattering.

Performance Analysis of the IEEE 802.11 Broadcast Scheme in a Wireless Data Network (무선 데이터 망에서 IEEE 802.11 브로드캐스트 기법의 성능 분석)

  • Park, Jae-Sung;Lim, Yu-Jin;Ahn, Sang-Hyun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.46 no.5
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    • pp.56-63
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    • 2009
  • The IEEE 802.11 standard has been used for wireless data networks such as wireless LAN, ad-hoc network, and vehicular ad-hoc network. Thus, the performance analysis of the IEEE 802.11 specification has been one of the hottest issues for network optimization and resource management. Most of the analysis studies were performed in a data plane of the IEEE 802.11 unicast. However, IEEE 802.11 broadcast is widely used for topology management, path management, and data dissemination. Thus, it is important to understand the performance of the broadcast scheme for the design of efficient wireless data network. In this contort, we analyze the IEEE 802.11 broadcast scheme in terms of the broadcast frame reception probability according to the distance from a sending node. Unlike the other works, our analysis framework includes not only the system parameters of the IEEE 802.11 specification such as transmission range, data rate, minimum contention window but also the networking environments such as the number of nodes, network load, and the radio propagation environments. Therefore, our analysis framework is expected to be used for the development of protocols and algorithms in a dynamic wireless data network.

VLSI Design of Interface between MAC and PHY Layers for Adaptive Burst Profiling in BWA System (BWA 시스템에서 적응형 버스트 프로파일링을 위한 MAC과 PHY 계층 간 인터페이스의 VLSI 설계)

  • Song Moon Kyou;Kong Min Han
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.42 no.1
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    • pp.39-47
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    • 2005
  • The range of hardware implementation increases in communication systems as high-speed processing is required for high data rate. In the broadband wireless access (BWA) system based on IEEE standard 802.16 the functions of higher part in the MAC layer to Provide data needed for generating MAC PDU are implemented in software, and the tasks from formatting MAC PDUs by using those data to transmitting the messages in a modem are implemented in hardware. In this paper, the interface hardware for efficient message exchange between MAC and PHY layers in the BWA system is designed. The hardware performs the following functions including those of the transmission convergence(TC) sublayer; (1) formatting TC PDU(Protocol data unit) from/to MAC PDU, (2) Reed-solomon(RS) encoding/decoding, and (3) resolving DL MAP and UL MAP, so that it controls transmission slot and uplink and downlink traffic according to the modulation scheme of burst profile. Also, it provides various control signal for PHY modem. In addition, the truncated binary exponential backoff (TBEB) algorithm is implemented in a subscriber station to avoid collision on contention-based transmission of messages. The VLSI architecture performing all these functions is implemented and verified in VHDL.

Design of a 2.5V 300MHz 80dB CMOS VGA Using a New Variable Degeneration Resistor (새로운 가변 Degeneration 저항을 사용한 2.5V 300MHz 80dB CMOS VGA 설계)

  • 권덕기;문요섭;김거성;박종태;유종근
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.40 no.9
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    • pp.673-684
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    • 2003
  • A degenerated differential pair has been widely used as a standard topology for digitally programmable CMOS VGAs. A variable degeneration resistor has been implemented using a resistor string or R-2R ladder with MOSFET switches. However, in the VGAs using these conventional methods, low-voltage and high-speed operation is very hard to achieve due to the dc voltage drop over the degeneration resistor. To overcome this problem a new variable degeneration resistor is proposed where the dc voltage drop is almost removed. Using the proposed gain control scheme, a low-voltage and high-speed CMOS VGA is designed. HSPICE simulation results using a 0.25${\mu}{\textrm}{m}$ CMOS process parameters show that the designed VGA provides a 3dB bandwidth of 360MHz and a 80dB gain control range in 2dB step. Gain errors are less than 0.4dB at 200MHz and less than l.4dB at 300MHz. The designed circuit consumes 10.8mA from a 2.5V supply and its die area is 1190${\mu}{\textrm}{m}$${\times}$360${\mu}{\textrm}{m}$.

A Study on the VLSI Design of Efficient Color Interpolation Technique Using Spatial Correlation for CCD/CMOS Image Sensor (화소 간 상관관계를 이용한 CCD/CMOS 이미지 센서용 색 보간 기법 및 VLSI 설계에 관한 연구)

  • Lee, Won-Jae;Lee, Seong-Joo;Kim, Jae-Seok
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.43 no.11 s.353
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    • pp.26-36
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    • 2006
  • In this paper, we propose a cost-effective color filter may (CFA) demosaicing method for digital still cameras in which a single CCD or CMOS image sensor is used. Since a CFA is adopted, we must interpolate missing color values in the red, green and blue channels at each pixel location. While most state-of-the-art algorithms invest a great deal of computational effort in the enhancement of the reconstructed image to overcome the color artifacts, we focus on eliminating the color artifacts with low computational complexity. Using spatial correlation of the adjacent pixels, the edge-directional information of the neighbor pixels is used for determining the edge direction of the current pixel. We apply our method to the state-of-the-art algorithms which use edge-directed methods to interpolate the missing color channels. The experiment results show that the proposed method enhances the demosaiced image qualify from $0.09{\sim}0.47dB$ in PSNR depending on the basis algorithm by removing most of the color artifacts. The proposed method was implemented and verified successfully using verilog HDL and FPGA. It was synthesized to gate-level circuits using 0.25um CMOS standard cell library. The total logic gate count is 12K, and five line memories are used.