• 제목/요약/키워드: behavior coding

검색결과 90건 처리시간 0.033초

A BLMS Adaptive Receiver for Direct-Sequence Code Division Multiple Access Systems

  • Hamouda Walaa;McLane Peter J.
    • Journal of Communications and Networks
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    • 제7권3호
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    • pp.243-247
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    • 2005
  • We propose an efficient block least-mean-square (BLMS) adaptive algorithm, in conjunction with error control coding, for direct-sequence code division multiple access (DS-CDMA) systems. The proposed adaptive receiver incorporates decision feedback detection and channel encoding in order to improve the performance of the standard LMS algorithm in convolutionally coded systems. The BLMS algorithm involves two modes of operation: (i) The training mode where an uncoded training sequence is used for initial filter tap-weights adaptation, and (ii) the decision-directed where the filter weights are adapted, using the BLMS algorithm, after decoding/encoding operation. It is shown that the proposed adaptive receiver structure is able to compensate for the signal-to­noise ratio (SNR) loss incurred due to the switching from uncoded training mode to coded decision-directed mode. Our results show that by using the proposed adaptive receiver (with decision feed­back block adaptation) one can achieve a much better performance than both the coded LMS with no decision feedback employed. The convergence behavior of the proposed BLMS receiver is simulated and compared to the standard LMS with and without channel coding. We also examine the steady-state bit-error rate (BER) performance of the proposed adaptive BLMS and standard LMS, both with convolutional coding, where we show that the former is more superior than the latter especially at large SNRs ($SNR\;\geq\;9\;dB$).

분류 및 코딩시스템을 이용한 디지털 가상공장 객체의 효율적 관리 (The Efficient Management of Digital Virtual Factory Objects Using Classification and Coding System)

  • 김유석;강형석;노상도
    • 한국CDE학회논문집
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    • 제12권5호
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    • pp.382-394
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    • 2007
  • Nowadays, manufacturing industries undergo constantly growing pressures for global competitions, and they must shorten time and cost in product development and production to response varied customers' requirements. Digital virtual manufacturing is a technology that can facilitate effective product development and agile production by using digital models representing the physical and logical schema and the behavior of real manufacturing systems including products, processes, manufacturing resources and plants. For successful applications of this technology, a digital virtual factory as a well-designed and integrated environment is essential. In this paper, we developed a new classification and coding system for effective managements of digital virtual factory objects, and implement a supporting application to verify and apply it. Furthermore, a digital virtual factory layout management system based on the classification and coding system has developed using XML, Visual Basic.NET and FactoryCAD. By some case studies for automotive general assembly shops of a Korean automotive company, efficient management of factory objects and reduction of time and cost in digital virtual factory constructions are possible.

소비자인지도화령수상사회책임(消费者认知度和零售商社会责任): 종미국시각출발적도덕구매행위적탐색성연구(从美国视角出发的道德购买行为的探索性研究) (Consumer Awareness and Evaluation of Retailers' Social Responsibility: An Exploratory Approach into Ethical Purchase Behavior from a U.S Perspective)

  • Lee, Min-Young;Jackson, Vanessa P.
    • 마케팅과학연구
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    • 제20권1호
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    • pp.49-58
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    • 2010
  • 企业社会责任已经成为学者们进行研究的一个重要课题. 多数认为企业社会责任对企业去定义他们在社会中的责任是必要的, 并且为他们的商业活动提供社会和道德标准. 其结果是, 相当数量的零售商已经采用企业社会责任为一个战略工具来宣传他们的商业活动. 为此, 本研究企图探索美国消费者在他们对零售商主观的感知和评估的基础上在道德购买和消费中的态度和行为. 本文的目的包括: 1)测定参与者对零售商企业社会责任的认知度. 2)评定参与者如何评估零售商企业社会责任. 3)测定参与者对零售商企业社会责任的评估过程是否影响他们对零售商的态度. 4)评定参与者对零售商企业社会责任的态度是否影响他们的购买行为. 本文并没有关注实际的零售商企业社会责任表现. 因为消费者的决定过程是基于个体的评定而不是实际的事实. 本研究调查了美国大学生对零售商企业社会责任的认知和评估. 本研究的参与者是56名来自美国东南大学的大学生. 他们的年龄在18岁到26岁之间. 使用开放性译码和选择性译码进行内容分析. 我们收集和分析了超过100张单倍行距的答复. 使用两步骤的译码(即开放性译码和选择性译码. 译码结果和分析笔记用来理解参与者对企业社会责任的认知和从书写的回复中提炼出来包括直接引用的答案所支持的伦理购买行为. 为保护参与者隐私, 这里使用的都是化名. 参与者被要求写下有关零售商, 他们对企业社会责任问题的认识和评估一个零售商的企业社会责任表现. 大部分应答者(n=28)表明他们对企业社会责任有一定的认识但是不觉得需要按这个要求去做. 少数应答者(n=8)表明他们对企业社会责任有一定的认识但是基本不关心. 结果表明当大学生评估零售商的几页社会责任表现时, 他们使用企业社会责任的三个纬度: 员工支持, 社区支持和环境支持. 我们发现如何对待和支持员工是一个评估零售商的企业社会责任的重要准则. 应答者表明作为一个员工和零售商有好的经历会使他们对此零售商有积极的感知和态度. 和员工支持相关的有四个主题: 根据员工表现的奖励和惩罚, 工作环境, 员工教育和训练课程, 以及员工和员工家人折扣. 良好的赏罚机制被认为是一个重要的属性. 和工作环境相关的因素包括: 零售商如何良好的遵守与工作时间相关的规则, 午餐时间和休息同样被认为是重要的属性之一. 有关社区支持, 有三个方面: 对当地社区销售比率的贡献, 对慈善组织的财政贡献和对社区大型活动的支持. 在环境方面, 有两个主题: 循环利用和销售有机或绿色产品. 在回复中有提到, 零售商正在尝试去做对环境友好所能做的. 一位应答者提到这个公司正在创造有环保设计的店铺. 并且能在这家公司的网站上轻松的找到为帮助环境所做的事情的信息. 应答者还注意到这些店铺可提供有机和亲环境产品. 应答者在此类中还提到关于这个公司如何使用环保的杯子和他们如何帮助新奥尔良的居民重建家园. 应答者注意到零售商为购买产品的消费者提供可再使用的袋子. 一位应答者说一家零售商通过提供有机棉来使他们的产品帮助环境. 在分析应答者之后, 我们发现参与者对零售商的企业社会责任的评估影响他们对零售商的态度. 然而, 在态度和购买行为之间有显著的差异. 尽管参与者对零售商的企业社会责任有积极的态度, 但资金和时间的缺乏也影响他们的购买行为. 总体来看, 一半的应答者(n=28)提到在购物时企业社会责任表现影响他们的购买决定. 本研究的结果为零售商针对消费者提高他们的形象而考虑企业社会责任提供了支持. 本研究暗示出消费者根据员工, 社区和环境三方面的支持来评估零售商. 评估, 态度和购买行为似乎是密切相关的. 也就是说, 评估是基于消费者对零售商企业社会责任的认识. 这些认识可以影响他们对零售商的态度从而进一步影响他们的购买行为. 参与者同时表明企业社会责任会使他们对零售商印象良好但是并不会影响他们的购买行为. 在参与者中, 价格和便利似乎超越了企业社会责任的重要性. 本文还讨论了此研究的启示, 对未来研究的建议和研究的局限.

아동의 문제행동과 지능이 어머니의 우울증에 미치는 영향 (EFFECTS OF CHILDREN'S PROBLEMATIC BEHAVIORS AND INTELLIGENCE ON MATERNAL DEPRESSION)

  • 양수진;정성심;노경선;이혜련
    • Journal of the Korean Academy of Child and Adolescent Psychiatry
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    • 제16권2호
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    • pp.211-218
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    • 2005
  • 연구목적 : 아동의 문제를 주소로 내원한 어머니의 우울증 관련인자를 알아보기 위함이다. 방법 : 50명의 아동과 어머니를 대상으로 지능검사를 포함한 임상 심리검사를 시행하였다. 어머니는 한국형 아동행동 조사표(Korean version of Achenbach's Child Behavior Checklist ; K-CBCL)를 선생님은 Teacher's Report Form(TRF)을 작성하였다. 어머니의 우울증 여부에 따라 두 군으로 나누어 조사하였다. 결과 : 총 50명의 어머니 중 $42\%$의 어머니가 우울장애를, $16\%$가 불안 장애를 가지고 있었다. 우울한 어머니는 아동 문제 중 K-CBCL 공격성과 외현화 문제에 높은 점수를 기록하였다. 우울한 어머니의 아동은 지능 검사에서 차례 맞추기와 바꿔쓰기에서 낮은 점수를 보였다. 선생님의 총 문제행동으로 보정을 하였을 때, 어머니의 우울증은 K-CBCL의 공격성, 외현화 문제, 총 문제 행동, 그리고 아동 지능 검사의 바꿔쓰기 항목과 관련이 있었다. 결론 : 아동의 공격적 행동, 외현화 행동, 총 문제 행동, 낮은 바꿔쓰기 점수가 어머니의 우울증과 관련이 있었다.

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체계화된 측정도구를 이용한 조사표 개선 모델 개발 및 적용 - 2014년 농업인의 업무상 질병 조사표 개선을 중심으로 - (Development and Application of the Questionnaire Improvement Model, Using Systematic Appraisal Tools - Improvement of the 2014 Korean Farmers' Occupational Disease and Injury Survey -)

  • 채혜선;이경숙;최동필;손정규
    • 농촌지도와개발
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    • 제23권3호
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    • pp.221-232
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    • 2016
  • This study aims to improve the Korean Farmers' Occupational Disease and Injury Survey (KFODIS), using the questionnaire improvement model, and systematic appraisal tools. The questionnaire improvement model comprises three stages: pretesting, redesign, and field-testing. The survey was evaluated by 13 expert reviewers, using a modified version of the Questionnaire Appraisal System (QAS-99). Based on the results of pretesting, survey questions were modified at a group meeting of experts. To identify potential issues with the improved survey questions, data were collected from 20 interviews and 31 respondents before behavior coding analysis was conducted. The questionnaire improvement model and systematic appraisal tools were useful in identifying, evaluating, and correcting miscommunication and other similar issues in the KFODIS.

Korean "Little Emperor": A Grounded Theory Approach to Clothing Market for Pre-schoolers

  • Ju, Naan;Lee, Kyu-Hye
    • Fashion, Industry and Education
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    • 제15권2호
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    • pp.36-52
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    • 2017
  • In this study, we tried to understand preschooler clothing trends and identify the purchase behaviors of various consumers, such as grandparents, aunts, uncles, and parents, who are the main consumers of the preschooler clothing market. We conducted in-depth interviews with consumers who were interested in preschooler clothing, purchased it frequently, and bought preschooler clothing within the last three months. Their purchase motivations and purchase behaviors were analyzed through exploratory and inductive analysis. The analysis was conducted by integrating categories into one process centered on core categories through open coding, axial coding, and selective coding. The results of this study included that 1) a variety of clothing purchase behaviors appeared as a central phenomenon, 2) the causal conditions that contributed to this phenomenon were the buyers' childcare experiences, purchase experiences, the personal consumption values of individuals, and income levels, 3) in response to the central phenomenon, the parents' action/interaction strategies were acceptance and rejection of purchased clothing, 4) contextual and Intervening conditions affecting action/interaction strategy were family environment changes, the VIB (Very Important Baby) phenomenon, parents' clothing involvement, and the relationship with the buyers, and acceptance by the users, and 5) as a result of the strategy expressed as acceptance and rejection, various clothing behaviors emerged. In this study, we identified that there are various influencers, apart from parents, involved in children's clothing consumption. Therefore, we need to keep in mind that various purchase behaviors and clothing trends that appear during one's childhood may affect the individual's clothing behavior in the future.

Characterization of New Two Parametric Generalized Useful Information Measure

  • Bhat, Ashiq Hussain;Baig, M. A. K.
    • Journal of Information Science Theory and Practice
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    • 제4권4호
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    • pp.64-74
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    • 2016
  • In this paper we define a two parametric new generalized useful average code-word length $L_{\alpha}^{\beta}$(P;U) and its relationship with two parametric new generalized useful information measure $H_{\alpha}^{\beta}$(P;U) has been discussed. The lower and upper bound of $L_{\alpha}^{\beta}$(P;U), in terms of $H_{\alpha}^{\beta}$(P;U) are derived for a discrete noiseless channel. The measures defined in this communication are not only new but some well known measures are the particular cases of our proposed measures that already exist in the literature of useful information theory. The noiseless coding theorems for discrete channel proved in this paper are verified by considering Huffman and Shannon-Fano coding schemes on taking empirical data. Also we study the monotonic behavior of $H_{\alpha}^{\beta}$(P;U) with respect to parameters ${\alpha}$ and ${\beta}$. The important properties of $H_{{\alpha}}^{{\beta}}$(P;U) have also been studied.

Optimizations for Mobile MIMO Relay Molecular Communication via Diffusion with Network Coding

  • Cheng, Zhen;Sun, Jie;Yan, Jun;Tu, Yuchun
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제16권4호
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    • pp.1373-1391
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    • 2022
  • We investigate mobile multiple-input multiple-output (MIMO) molecular communication via diffusion (MCvD) system which is consisted of two source nodes, two destination nodes and one relay node in the mobile three-dimensional channel. First, the combinations of decode-and-forward (DF) relaying protocol and network coding (NC) scheme are implemented at relay node. The adaptive thresholds at relay node and destination nodes can be obtained by maximum a posteriori (MAP) probability detection method. Then the mathematical expressions of the average bit error probability (BEP) of this mobile MIMO MCvD system based on DF and NC scheme are derived. Furthermore, in order to minimize the average BEP, we establish the optimization problem with optimization variables which include the ratio of the number of emitted molecules at two source nodes and the initial position of relay node. We put forward an iterative scheme based on block coordinate descent algorithm which can be used to solve the optimization problem and get optimal values of the optimization variables simultaneously. Finally, the numerical results reveal that the proposed iterative method has good convergence behavior. The average BEP performance of this system can be improved by performing the joint optimizations.

Block-Ordered Layered Detector for MIMO-STBC Using Joint Eigen-Beamformers and Ad-Hoc Power Discrimination Scheme

  • Lee Won-Cheol
    • Journal of Communications and Networks
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    • 제8권3호
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    • pp.275-285
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    • 2006
  • Suitable for multi-input multi-output (MIMO) communications, the joint beamforming space-time block coding (JBSTBC) scheme is proposed for high-speed downlink transmission. The major functionality of the scheme entails space-time block encoder and joint transmit and receive eigen-beamformer (EBF) incorporating with block-ordered layered decoder (BOLD), and its operating principle is described in this paper. Within these functionalities, the joint EBFs will be utilized for decorrelating fading channels to cause an enhancement in the spatial diversity gain. Furthermore, to fortify the capability of layered successive interference cancellation (LSIC) in block-ordered layered decoding process, this paper will develop a simple ad-hoc transmit power discrimination scheme (TPDS) based on a particular power discrimination function (PDF). To confirm the superior behavior of the proposed JBSTBC scheme employing ad-hoc TPDS, computer simulations will be conducted under various channel conditions with the provision of detailed mathematical derivations for clarifying its functionality.

근거이론방법론을 바탕으로 한 도서관서비스 이용자의 정보추구행태모델 제안 (Library Service Users' Information Seeking Behavior Model Based on the Grounded Theory Methodology)

  • 이성신
    • 한국문헌정보학회지
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    • 제44권1호
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    • pp.5-28
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    • 2010
  • 본 연구는 도서관 서비스이용자와의 인터뷰자료를 근거이론방법론을 기초로 분석하여 도서관 서비스이용자의 정보추구행태상의 특성을 파악하고자하였으며 이를 토대로 도서관 서비스이용자의 정보추구행태모델을 제시해 보고자 하였다. 연구결과 도출된 모델에 따르면 도서관 서비스이용자의 정보추구행태를 설명하는데 있어서 다음의 열 가지 요소가 중요한 것으로 나타났다: 정보이용자의 환경, 의미 있는 주변인, 정보제공, 정보원의 인지, 개인의 과거경험, 기억, 정보수집, 요구를 발생시키는 사건 혹은 환경의 발생, 정보이용, 만족 혹은 불만족의 경험.