• Title/Summary/Keyword: performance improvement

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Performance Analysis of Multi-Carrier CDMA System by Multi-User Interference Cancellation Techniques (다중 접속 간섭 제거 기법에 의한 Multi-Carrier CDMA 시스템의 성능 분석)

  • Park, Ki Sik
    • Journal of Advanced Navigation Technology
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    • v.6 no.4
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    • pp.306-311
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    • 2002
  • In this paper, we have proposed the Multi-Carrier (MC) CDMA system by adopting multi-interference cancellation techniques connecting an adaptive array antenna and a CCI canceller in cascade form. And, we have analyzed the BER performance of system in AWGN channel where MUI is a major interference degrading the performance of the proposed MC CDMA system. Also, we have evaluated the degree of performance improvement in the proposed MC CDMA system. As the result of analysis, a CCI canceller is better efficient than an adaptive array antenna in the performance improvement and that the performance improvement becomes large as the number of users increases when multi-interference cancellation techniques are used in cascade form. Also, we found that performance of $10^{-5}$ in a point of view BER could be achieved when $E_b/N_o$ is more than 10 dB.

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Performance Analysis of Multi-Carrier CDMA Systems under Indoor Wireless Environment with Impulsive Noise (임펄스성 잡음이 존재하는 실내 무선 환경에서 Multi-Carrier CDMA 시스템의 성능 분석)

  • Lee, Young-Choon;Park, Ki-Sik;Cho, Sung-Joon
    • Journal of Advanced Navigation Technology
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    • v.7 no.1
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    • pp.30-37
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    • 2003
  • In this paper, we have analyzed the BER (Bit Error Rate) performance of MC-CDMA systems under indoor wireless environment with class A impulsive noise suggested by Middleton. For the performance evaluation, we considered from strong to weak impulsive noise characteristics. And we have evaluated the degree of performance improvement by using turbo code as a compensation technique to impulsive noise. From the result of analysis, it is found powerful performance improvement scheme must be adopted in the system under impulsive noise environment, and when turbo code scheme is adopted, system BER performance is improved by the $10^{-2}$. As the impulsive noise characteristics approaches AWGN characteristics, the degree of performance improvement by adopting turbo code become larger.

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A Study on Contract Attributes, Firm's Performance and Partnership Intention in the Digital Contents Service Industry (디지털 콘텐츠 산업에서의 계약 속성, 성과 및 파트너십 의도에 관한 연구)

  • Kim, Seon-Min
    • Journal of the Korea Safety Management & Science
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    • v.14 no.4
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    • pp.271-279
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    • 2012
  • Although digital contents markets grow very rapidly and are known as a higher value added industry, there is also potential risk in producing digital contents. Thus, many firms have begun to produce a firm's digital contents by outsourcing from other companies in order to catch-up new technologies and to make stable profits. However, since contracts are decided mostly based on bidding price and also standard contract are not available, there is a limit on the benefit from the contents outsourcing. Thus, this study argues that if both contract factors such as contract concreteness and flexibility are well managed, the on-line digital contents will increase the performance of a firm. This study deals with the influence on the firm's performance by the outsourcing in contract factors based on the empirical analysis. Using regression analysis with these two dependent variables, the findings showed that the contract concreteness had positive effects on both cost improvement performance and efficiency improvement performance, but the contract feasibility only had positive effect on efficiency improvement performance. In addition, the result of the study showed that the contract performance of outsourcing the digital contents have a positive impact on the partnership intention.

Study on Memory Performance Improvement based on Machine Learning (머신러닝 기반 메모리 성능 개선 연구)

  • Cho, Doosan
    • The Journal of the Convergence on Culture Technology
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    • v.7 no.1
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    • pp.615-619
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    • 2021
  • This study focuses on memory systems that are optimized to increase performance and energy efficiency in many embedded systems such as IoT, cloud computing, and edge computing, and proposes a performance improvement technique. The proposed technique improves memory system performance based on machine learning algorithms that are widely used in many applications. The machine learning technique can be used for various applications through supervised learning, and can be applied to a data classification task used in improving memory system performance. Data classification based on highly accurate machine learning techniques enables data to be appropriately arranged according to data usage patterns, thereby improving overall system performance.

Research on Health Performance Evaluation of Existing Buildings using WELL Building Standard - for Green Remodeling applied Buildings - (웰 빌딩 스탠다드를 활용한 기존 건축물의 건강성능평가 연구 - 그린리모델링 적용 건축물을 대상으로 -)

  • Lee, Du Hwan;Kim, Young Il;Kim, Jae Moon
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.36 no.2
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    • pp.165-173
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    • 2020
  • The purpose of this research is to evaluate the health performance of existing buildings which completed green remodeling using the WELL Building Standard developed by Delos in the USA. The features and the level of improvement in health were examined and the results were as follows. As a result of comprehensive evaluation of the health performance of the target building, the health performance after green remodeling improvement was improved by 17.3% compared to before green remodeling. As a result of applying the alternatives for improving health performance, improvements were 22.9% by Alternative 1, 28.8% by Alternative 2, and 28.7% by Alternative 3. If the improvement ratio with respect to the construction cost were compared, Alternative 1 was the best followed by Alternative 2. Finally, the cost effectiveness of improving health performance against construction cost were best in the order of self-closing door installation, airtight seal, and pest inspections.

Hygrothermal Performance Improvement Plan of Standard Model for Rural Housing and Wooden Housing (농촌주택 및 목조주택 표준모델 구조체의 습·열 환경 성능 개선 방안)

  • Yoo, Dong-Wan;Lee, Tae-Goo
    • Journal of the Korean Institute of Rural Architecture
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    • v.23 no.4
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    • pp.63-71
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    • 2021
  • The purpose of this study was to investigate whether the standard models for rural housing and wooden housing model have performance for hygrothermal and to propose a way of improvement relevant to hygrothermal performance for those models. All of the models to be analyzed were found to have some parts that were absent of stability in terms of performance for hygrothermal. In the process of analyzing the causes and proposing improvement measures, the following conclusions were derived. Fist, The exterior surface of the structure should be composed of a structure with good moisture permeability, and for the interior surface, a variable vapor retarder paper should be applied in consideration of the reverse condensation phenomenon in summer. Second, in terms of performance for hygrothermal, applications of external insulation plaster finish to the exterior wall or of ventilation method using a rafter vent on the roof should be avoided. Third, a rain screen method with a ventilation layer should be applied to the exterior wall, and a method of constructing ventilation layer separated from the insulation layer with a vapor retarder paper should be applied to the roof. Fourth, the application of insulation materials having capillary action, such as wood fiber insulation board or cellulose insulation board, contributes to more stable performance for hygrothermal.

Portfolio Decision Model based on the Strategic Adjustment Capacity: A Bionic Perspective on Bird Predation and Firm Competition

  • Mao, Chao;Chen, Shou;Liu, Duan
    • Journal of Distribution Science
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    • v.13 no.1
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    • pp.7-18
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    • 2015
  • Purpose - This study integrates a corporate competition system with a bird predation system to examine how organizational strategic adjustment capacity influences firm performance. By proving the prominent effects on performance, a financial vector is constructed to represent corporate strategic adjustment results, and an operation capacity vector is constructed, which can be categorized as a parameter for locating birds. All these works help us to propose a new method of investment, the portfolio decision model based on the strategic adjustment capacity. Research design, data, and methodology - Strategic adjustment capacity can be decomposed into three aspects: the organizational learning capacity from the top firms, the extent to which firms maintainor rely on the best operational capacity vector in history, and the ability to eliminate the disadvantages or retain the advantages of the operation capacity vector from the previous year. The method of solving cyclic equations is designed to evaluate strategic adjustment. Firms manufacturing specialized equipment are chosen to test the effects of the strategic adjustment capacity on three aspects of firm performance. Results - There is a positive correlation between the capacity to learn from the best firms and performance improvement. The relationship between the dependence or maintenance of a firm's advantages and performance improvement is a U-shape curve, and there is no significant effect of inertial control on performance improvement. Conclusions - A firm's competition system is a sophisticated adaptation, and competitive advantage and performance can be investigated based on the principles of competition in nature.

A Study on Web Service Performance Enhancement Using Tuning Model (튜닝 모델을 이용한 웹 서비스 성능 향상에 관한 연구)

  • Oh, Kie-Sung
    • Journal of Information Technology Services
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    • v.4 no.2
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    • pp.125-133
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    • 2005
  • Because of paradigm change to web service, numerous institutes have been suggested supporting solution about web service, and actively developed system using web service but it is hard to find out a systematic study for web service performance enhancement. Generally, there are SOAP message processing improvement and configuration optimization of server viewpoint for web service performance enhancement. Web service performance enhancement through SOAP message processing improvement have been studied related research but configuration optimization of server is hard to find out a systematic tuning model and performance criteria. In this paper, I suggested performance testing based tuning model and criteria of configuration optimization of server viewpoint. We executed practical analysis using tuning model about web service in internet. This paper show that the proposed tuning model and performance criteria is applicable to web service performance enhancement.

The Effect of Supply Chain Management Activities and Marketing Capabilities on the Performance of Apparel Firms (의류기업의 공급사슬관리 기반활동과 마케팅 역량이 업무성과에 미치는 영향)

  • Lee, Kyung-Hoon;Park, Jae-Ok
    • Journal of the Korean Society of Clothing and Textiles
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    • v.31 no.6 s.165
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    • pp.942-954
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    • 2007
  • The purpose of this research is to examine the level of SCM activity, marketing capability, and firm performance for apparel firms, and to investigate the effect of SCM activities and marketing capabilities for firm performance improvement. This study surveyed domestic apparel manufacturing brands that distribute products nationwide. The data was collected through questionnaires sent to managers or executives in large and middle manufacturing corporations among Korea's listed and registered corporations. The data collection has been carried out from November 10 until December 11, 2006. The questionnaires were transmitted by individual visit, fax, and mail. A total of 98 completed responses were returned, three incomplete responses were discarded. The results were as follows: First, SCM activity was classified into 3 dimensions: structural, logistical, and technological factor. Three dimensions of marketing capability were identified with differentiation, cost-leadership, and operational factor. Firm performance was classified into three dimensions: financial, productivity, and customer satisfaction factor. Second, result of analyzing effects of SCM activities for firm performance improvement, it was found that the improvement of technological activities affected acquirement of financial, productivity, and customer satisfaction performs. Structural activities affected factor of productivity performs. Third, result of analyzing effects of marketing capabilities for firm performance improvement, improvement of differentiation capabilities affected acquirement of financial, customer satisfaction performs. And the improvement of operational capability affected acquirement of financial performs and improvement of cost-leadership capability affected factor of productivity performs.

Manufacturing strategy and change programs of Korean firms (한국제조기업의 생산전략과 생산혁신활동)

  • 이승규;김진섭
    • Korean Management Science Review
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    • v.13 no.1
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    • pp.135-156
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    • 1996
  • The purpose of this paper is to study the links between manufacturing strategy and change programs of manufacturing firms in Korea. The nature of our analysis is more descriptive than normative or confirmative. First, we investigate the linkage between manufacturing strategy, manufacturing capability, change programs and performance measurement systems. Secondly, we intend to explore an empirical typology of manufacturing strategy and change programs. The initial findings of the study are as follows: Linkage between manufacturing strategy and change programs of manufacturing firms was not apparent. Flexibility as a strategic priority is positively related to the innovative change programs. There are two distinctive strategies of manufacturing firms in Korea, namely, quality strategy and balanced strategy. We identified three types of change programs, which are incremental change, administrative innovation, and process innovation. Incremental change group has represented low factor score in the change program dimensions. The firms in administrative innovation group mainly depend on information systems and business reengineering. Korean manufacturing firms seem to pursue process improvement by trying simultaneously incremental change in the process, managerial process improvement, and a little bit of innovative change. Performance variable utilization of the firms are not significantly different along with manufacturing strategies and change programs. We found, however, learning and improvement performance dimension is significantly related to flexibility variables. Process innovation group marked high score in usage of learning and improvement indices. The findings of this study seem to have various implications on realigning the manufacturing strategy, change programs, and performance systems in Korean firms.

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