• Title/Summary/Keyword: SNA

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Proposal and Design of a Novel SNA Protocol for the Power Control System (전력제어 시스템을 위한 SNA 프로토콜 제안 및 설계)

  • Park, Min-Ji;Lee, Dong-Min;Min, Sang-Won
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.8B
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    • pp.1122-1128
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    • 2010
  • In this paper, we proposed and designed a novel SNA protocol which operates in the way of a server and a client in the power control system. The proposed SNA protocol includes the information about the mode switching, the saving position of context information, the user trigger, and so forth, which are needed in the power management devices. We consider the application of the SNA protocol to the home network, where message flows between the SNA server and the SNA client. To verify the operation of the SNA protocol, the state transition diagrams of the server in the home gateway and the client in the network device are shown. Hence, we can conclude the SNA can operate without malfuction.

High Performance SoC On-chip-bus Architecture with Multiple Channels and Simultaneous Routing (다중 채널과 동시 라우팅 기능을 갖는 고성능 SoC 온 칩 버스 구조)

  • Lee, Sang-Hun;Lee, Chan-Ho
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.44 no.4
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    • pp.24-31
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    • 2007
  • Up to date, a lot of bus protocol and bus architecture are released though most of them are based on the shared bus architecture and inherit the limitation of performance. SNP (SoC Network Protocol), and hence, SNA (SoC Network Architecture) which are high performance on-chip-bus protocol and architecture, respectively, have been proposed to solve the problems of the conventional shared bus. We refine the SNA specification and improve the performance and functionality. The performance of the SNA is improved by supporting simultaneous routing for bus request of multiple masters. The internal routing logic is also improved so that the gate count is decreased. The proposed SNA employs XSNP (extended SNP) that supports almost perfect compatibility with AMBA AHB protocol without performance degradation. The hardware complexity of the improved SNA is not increased much by optimizing the current routing logic. The improved SNA works for IPs with the original SNP at its best performance. In addition, it can also replace the AMBA AHB or interconnect matrix of a system, and it guarantees simultaneous multiple channels. That is, the existing AMBA system can show much improved performance by replacing the AHB or the interconnect matrix with the SNA. Thanks to the small number of interconnection wires, the SNA can be used for the off-chip bus system, too. We verify the performance and function of the proposed SNA and XSNP simulation and emulation.

SNA/SDLC 한글 워크스테이션에 관하여

  • 김기용;이연훈
    • The Magazine of the IEIE
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    • v.11 no.2
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    • pp.17-21
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    • 1984
  • SNA(systems network architecture)는 가장 널리 이용되고 있는 네트워크 구성 방법의 하나로서 IBM 뿐만 아니라 FACOM, TANDEM 등의 타기종에서도 SNA 방식의 네트워크 구성 방법을 제공하고 있는데 국내에서는 SNA/SDLC 프로토콜에 의하여 호스트와 communication하는 IBM 3274형의 TCU(terminal control unit)에 2-바이트 한글의 처리 기능을 추가한 단말기들을 주로 이용하고 있다. 본 논고에서는 SNA의 개념 및 특성에 관한 간단한 소개와 더불어 3274 TCU의 기능, 한글 데이터의 표현 및 통신 방법 등에 관하여 간단히 기술하고자 한다.

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Reviewing Classification Scheme of Timber Assets for the National Accounting in Korea (국부통계 산출을 위한 입목자산 분류기준의 정립)

  • Chong, Se Kyung;Kim, Young-Hwan
    • Journal of Korean Society of Forest Science
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    • v.96 no.6
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    • pp.724-729
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    • 2007
  • Due to the low productivity in timber harvesting, economic values of forest resources have been rarely validated in Korea. Since the Korea Forest Service provided a statistic of the timber assets for the survey of the 4th National Accounting (1998), no more statistics or measurements have been provided. Further, it becomes an issue that there is no clear standard to classify timber assets into produced or non-produced assets. In this research, we intended to provide a reasonable standard that enables one to classify timber assets either in produced or non-produced assets. For this purpose, articles in the '1993 System of National Accounts (SNA)', which presented definitions and scopes of biological assets, were scanned. The articles related to timber assets in the Korean version of SNA were compared with those in the original version of SNA that were proposed by UN. The results show that the Korean version of SNA seems to have much emphasis on natural occurrence or plantation for the classification standard, while its original version rather focus on the existence of direct control, responsibility, and management by institutional units. According to the original version of SNA, naturally occurring assets, which were basically classified into non-produced assets, were treated as being cultivated and classified into the produced asset when they (or their growth) were under the direct control, responsibility, and management of institutional units. Therefore, a guidance was presented to renew the Korean version of SNA and to innovate the classification standards for timber assets.

Analysis of the Impact Relationship for Risk Factors on Big Data Projects Using SNA (SNA를 활용한 빅데이터 프로젝트의 위험요인 영향 관계 분석)

  • Park, Dae-Gwi;Kim, Seung-Hee
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.21 no.1
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    • pp.79-86
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    • 2021
  • In order to increase the probability of success in big data projects, quantified techniques are required to analyze the root cause of risks from complex causes and establish optimal countermeasures. To this end, this study measures risk factors and relationships through SNA analysis and presents a way to respond to risks based on them. In other words, it derives a dependency network matrix by utilizing the results of correlation analysis between risk groups in the big data projects presented in the preliminary study and performs SNA analysis. In order to derive the dependency network matrix, partial correlation is obtained from the correlation between the risk nodes, and activity dependencies are derived by node by calculating the correlation influence and correlation dependency, thereby producing the causal relationship between the risk nodes and the degree of influence between all nodes in correlation. Recognizing the root cause of risks from networks between risk factors derived through SNA between risk factors enables more optimized and efficient risk management. This study is the first to apply SNA analysis techniques in relation to risk management response, and the results of this study are significant in that it not only optimizes the sequence of risk management for major risks in relation to risk management in IT projects but also presents a new risk analysis technique for risk control.

Mesodermal repression of single-minded in Drosophila embryo is mediated by a cluster of Snail-binding sites proximal to the early promoter

  • Park, Kye-Won;Hong, Joung-Woo
    • BMB Reports
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    • v.45 no.10
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    • pp.577-582
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    • 2012
  • single-minded (sim) is a master regulatory gene that directs differentiation in the central nervous system during Drosophila embryogenesis. Recent identification of the mesectoderm enhancer (MSE) of sim has led to the hypothesis that two Snail (Sna)-binding sites in the MSE may repress sim expression in the presumptive mesoderm. We provide evidence here that three Sna-binding sites proximal to the sim promoter, but not those of the MSE, are responsible for the mesodermal repression of sim in vivo. Using transgenic embryos injected with lacZ transgenes, we showed that sim repression in the mesoderm requires the three promoter-proximal Sna-binding sites. These results suggest that Sna represses the mesectodermal expression of sim by directly repressing the nearby promoter, and not by quenching adjacent transcriptional activators in the MSE. These data also showed how the MSE, lacking the three proximal Sna-binding sites, reproduced the endogenous pattern of sim expression in transgenic embryos.

SNA Approach for Analyzing the Research Trend of China's Logistics (SNA 분석을 활용한 중국물류 연구동향 분석에 관한 연구)

  • Song, Shi-cheng;Park, Sung-hoon;Yeo, Gi-Tae
    • Journal of Digital Convergence
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    • v.16 no.5
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    • pp.55-63
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    • 2018
  • Although there has been a great change in the Chinese logistics industry, there have been few studies on the research trends of logistics in China. Existing research has been conducted on subdivision topics such as transportation efficiency, warehouse location and port efficiency. In this study, the research trends of logistics in China from 2000 to 2017 were analyzed using SNA method. The data were collected from foreign journals and a total of 82 related papers were used for analysis. The first period (2000-2008) was derived from the top keywords such as "Globalization", "Hong Kong", "FDI" and "outsousing". The results of the second period (2009-2013) were derived from keywords such as "international trade" and "reverse logistics", and in the third period (2013-2017) "3PL", "warehousing", "railways" "supply chain", "economic", "port" and "Belt and Road" The analysis of China's logistics using SNA method shows that the research trend of China's logistics is evolving as China is changing rapidly under the globalization context.

A Long Non-Coding RNA snaR Contributes to 5-Fluorouracil Resistance in Human Colon Cancer Cells

  • Lee, Heejin;Kim, Chongtae;Ku, Ja-Lok;Kim, Wook;Kim Yoon, Sungjoo;Kuh, Hyo-Jeong;Lee, Jeong-Hwa;Nam, Suk Woo;Lee, Eun Kyung
    • Molecules and Cells
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    • v.37 no.7
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    • pp.540-546
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    • 2014
  • Several types of genetic and epigenetic regulation have been implicated in the development of drug resistance, one significant challenge for cancer therapy. Although changes in the expression of non-coding RNA are also responsible for drug resistance, the specific identities and roles of them remain to be elucidated. Long non-coding RNAs (lncRNAs) are a type of ncRNA (> 200 nt) that influence the regulation of gene expression in various ways. In this study, we aimed to identify differentially expressed lncRNAs in 5-fluorouracil-resistant colon cancer cells. Using two pairs of 5-FU-resistant cells derived from the human colon cancer cell lines SNU-C4 and SNU-C5, we analyzed the expression of 90 lncRNAs by qPCR-based profiling and found that 19 and 23 lncRNAs were differentially expressed in SNU-C4R and SNU-C5R cells, respectively. We confirmed that snaR and BACE1AS were down-regulated in resistant cells. To further investigate the effects of snaR on cell growth, cell viability and cell cycle were analyzed after transfection of siRNAs targeting snaR. Down-regulation of snaR decreased cell death after 5-FU treatment, which indicates that snaR loss decreases in vitro sensitivity to 5-FU. Our results provide an important insight into the involvement of lncRNAs in 5-FU resistance in colon cancer cells.

Chaotic vibration characteristics of Vertical Axis Wind Turbine (VAWT) shaft system

  • C.B. Maheswaran;R. Gopal;V.K. Chandrasekar;S. Nadaraja Pillai
    • Wind and Structures
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    • v.36 no.3
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    • pp.215-220
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    • 2023
  • We study the progressive full-scale wind tunnel tests on a high solidity vertical axis wind turbine (VAWT) for various tip speeds and pitch angles to understand the VAWT shaft system's dynamics using 0-1 Test for chaos. We identify that while varying rotor speed (tip speed) of the turbine, the system's dynamics change from periodic to chaotic through quasiperiodic and strange non-chaotic (SNA) states. The present study is the first experimental evidence for the existence of these states in the VAWT shaft system to the best of our knowledge. Using the asymptotic growth value Kc in 0-1 test, when the turbine operates at the low tip speeds and high pitch angles for low incoming wind speeds, the system behaves periodic (Kc ≈ 0). However, when the incoming wind speed increases further the system's dynamics shift from periodic to chaotic vibrations through quasi-periodic and SNA. This phenomenon is due to the dynamic stalling of blades which induces chaotic vibration in the VAWT shaft system. Further, the singular continuous spectrum method validates the presence of SNA and differentiates the SNA from chaotic vibrations.

글로벌 해상화물의 물류네트워크 패턴 연구: SNA 분석 중심으로

  • 김주혜;김율성;남정우
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2022.06a
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    • pp.394-395
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    • 2022
  • 급변하는 환경변화에 따라 해상화물 네트워크의 구조에 대한 정밀한 분석과 발전방향에 대한 예측의 필요성이 제기되고 있다. 사회연결망 분석인 SNA 분석을 통해 글로벌 해상 물류네트워크의 변화 특성을 분석하였다.

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