• Title/Summary/Keyword: CFO Analysis

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Performance Analysis of Fine Frequency Synchronization Scheme in Mobile WiMAX Systems (Mobile WiMAX 시스템에서 미세 주파수 동기화 기법의 성능 분석)

  • Yang, Hyun;Jeong, Kwang-Soo;Lee, Kyeong-Il;Yi, Jae-Hoon;You, Young-Hwan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.8A
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    • pp.815-820
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    • 2008
  • Carrier frequency offset (CFO) is one of the most important problems in an orthogonal frequency division multiplexing (OFDM) system, which seriously degrades the performance of the systems due to its time-variant behavior. In this paper, the performance of a pilot-assisted fine CFO estimator in OFDM-based mobile WiMAX systems is analyzed. Analytical closed-form expression of the mean square error (MSE) of the post-FFT based CFO synchronization scheme is reported for time-variant fading channels. Taking into account the frame structure of the IEEE802.16e standard, simulation results are used to verify the theoretical analysis developed in this paper.

Differentiation of Vibrio spp. including Core Group Species by PCR-RFLP (PCR-RFLP에 의한 Vibrio core group을 포함한 Vibrio 종의 구분)

  • Park, Jin-Sook
    • Journal of Life Science
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    • v.22 no.2
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    • pp.245-250
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    • 2012
  • The 16S rDNA - RFLP types for six Vibrio species (V. fluvialis, V. proteolyticus, V. vulnificus, V. mimicus) including two core group members, V. alginolyticus and V. parahaemolyticu s, and Grimontia (Vibrio) hollisae were determined using PCR-RFLP analysis. Six tetrameric restriction enzymes (Alu I, Cfo I, Dde I, Hae III, Msp I, and Rsa I) were selected for RFLP analysis. V. alginolyticus, V. parahaemolyticus, and V. proteolyticus showed the same RFLP pattern following digestion with four of the six used restriction enzymes: CfoI, DdeI, MspI, and RsaI. Various restriction enzyme combinations generated digests recognizable as distinct RFLP types for each of the assayed Vibrio species. In particular, AluI single digestion produced species specific band patterns that enabled the differentiation between these Vibrio species. Dendrogram based on restriction patterns showed that two Vibrio core group members, V. alginolyticus and V. parahaemolyticus were closely related having a similarity over 90%. Although the observed RFLP pattern for Grimontia hollisae shared several common bands with other Vibrio spp., G. hollisae results were still clearly distinct from Vibrio spp. RFLP types for all restriction enzymes tested. If restriction enzymes are aptly selected, PCR-RFLP analysis is still a rapid and effective tool for differentiating Vibrio species.

Genetic Relationships of Internal Transcribed Spacer (ITS) Regions on Entomopathogenic Fungi by RFLP (Entomopathogenic Fungi의 ITS 영역에 대한 RFLP 분석)

  • Choi, In-Young;You, Young-Jin;Choi, Joung-Sik;Lee, Wang-Hyu
    • The Korean Journal of Mycology
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    • v.28 no.2
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    • pp.112-117
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    • 2000
  • A similarity coefficient were analyzed by RFLP of fourteen species of entomopathogenic fungi, isolated from inhabiting pupa and adult insect at forest. Each rDNA ITS I and ITS II with primers of ITS 1 and ITS 4 was amplified by PCR. The amplified products were conserved to 500 bp were not demarcated between genus and species. Four Paeciliomyces tenuipes, two Beauveria bassiana and six Cordyceps militaris were treated by seven restriction enzymes and confirmed in species except JB3 by electrophoresis band. However, the band of C. scarabaeicola showed the identity with B. bassiana. The result of this experiment indicated that the teleomorph of C. scarabaeicola was the same as that of B. bassiana. CfoI and HpaII of seven restricted enzymes were easily discriminating in the genus between Paecilomyees and Cordyceps. Especially, CfoI was more effective to classify the genera of Paecilomyees, Cordyceps and Beauveria than other restriction enzymes. The band patterns of RFLP of P. tenuipes, C. militaris, C. scarabaeicola and B. bassiana were also analyzed by UPGMA program of NTSYS-pc and showed 100% significance. Thus, the similarity coefficient tended to be lower between genera by RFLP analysis, but was higher between species.

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Genetic Diversity of Korean Cyanobacteria determined by DNA polymorphisms within the Phycocyanin Locus (Phycocyanin locus내의 DNA Polymorphism에 의한 한국산 Cyanobacteria의 유전적 다양성)

  • 박진숙;권주리;유순애
    • Korean Journal of Microbiology
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    • v.36 no.4
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    • pp.249-253
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    • 2000
  • The genetic diversity among Korean cyanobacteria was assessed by restriction fragment length polymorphism(RFLP) analysis of PCR products from the phycocyanin locus. Strains of all the genera tested were successfully amplified, and the size of amplified fragments was approximately 700bp. The restriction patterns generated by AluI, MspI, and HaeIII were conserved for strains within each of genera studied and were specific to the genus level. Intrageneric delineation of strains was revealed by the enzyme, CfoI for members of genera Anabeana and Synechocystis. Phenogram derived from the different RFLP patterns revealed a coherent cluster among Anabeana, Chlorogloea, and Synechocystis strains. PC-RFLP methods provided useful tools for classification of cyanobacteria.

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Ventilation Analysis for an Engine Room of a Ship (선박의 기관실 통풍 해석)

  • Lee, Hyeok;Seo, Hyung-Kyun
    • Journal of the Society of Naval Architects of Korea
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    • v.41 no.5
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    • pp.63-69
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    • 2004
  • This study contains the CFD analysis to predict the flow in engine room and utilize the results as a reference for arranging smoke detectors. FLUENT, a commercial CFD code is adopted because of its good application experience in DSME(Daewoo Shipbuilding & Marine Engineering Co.. Ltd.). The target is the engine room of VLCC. which was delivered in 2002. The model for analysis includes main structure elements, ventilation ducts, main engine and other big size equipment. From the analysis results, the internal flow pattern can be observed and some guidelines for the position of smoke detectors cane be presented.

Evaluation on Bankruptcy Prediction Model of Hospital using the comparative Analysis of Financial Index (재무지표 비교 분석에 의한 병원도산예측모형 평가)

  • Kim, Jae-Myeong;Ahn, Young-Chang
    • Health Policy and Management
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    • v.15 no.4
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    • pp.81-109
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    • 2005
  • According to many recent studies suggesting that cash flow analysis method tends to be more effective than traditional financial index analysis method to predict corporate bankruptcy, this study applies the cash flow analysis method to hospital business to identify the significant variables which can distinguish between superior hospitals and bankruptcy hospitals. The author analyzed recent 3 years, i.e. from the year of 2000 to the year of 2002, financial statements of 31 bankrupt hospitals In 2003, and the same number of superior hospitals through using Multiple Discriminant Analysis and Logit Analysis. The results are belows; First, the study releases that Logit Analysis is more likely to be effective than Multiple Discriminant Analysis. Second, this research also shows that traditional financial index analysis method is more superior compare to cash flow analysis method for hospital bankruptcy predict model. Finally, this study suggest that the significant variables, which can distinguish superior hospitals from bankrupt hospitals, are Operating/Current Liabilities$(Y_2)$, CFO/Equity$(Y_5)$ for cash flow analysis method and Net Worth to Total Assets Ratio$(X_1)$, Quick Ratio $(X_3)$, Return on Assets$(X_6)$, Growth Rate of Patient Revenues$(X_{16})$ for traditional financial index analysis method.

Genetic comparison between Spirometra erinacei and S. mansonoides using PCR-RFLP analysis (만손열두조충과 북미열두조충의 중합효소연쇄반응-마디길이여러꼴 분석법을 이용한 유전 형질 비교)

  • LEE, Soo-Ung;HUH, Sun;PHARES, C. Kirk
    • Parasites, Hosts and Diseases
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    • v.35 no.4
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    • pp.277-282
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    • 1997
  • The only observed morphological difference between Spirometra erinqsei and S. mcnsonoides is the uterine shape of the mature proglottid. Two species of worms are thought to be evolutionarily closely related. Biomolecular colnparison of the ho worms by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis was conducted to observe the genetic distance. The 285 rDNA, mitochondrial cytochrome c oxidase subunit I (mCOI), and ribosomal internal transcribed spacer 1 (ITSI) fragments were obtained from the worms by PCR. The PCR products were cleaved by 5 four-base pair restriction enzyme combinations (Msp I, Hae III, Alu I, Cfo I, Rsa I) , electrophoresed and analyzed with PAUP 3.1.1. The fragment Patterns or 285 rDNA and Lni demonstrated that two worms were in identical systematic tree with bootstrap number 94 and 100, respectively As for mCOI, bootstrap number was 74 in a different tree. Above results are indicative of recent common ancestry between S. etinocei and S. mansonoides.

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Design and Analysis for the POD Type Waterjet System (POD형 물분사 추진장치의 설계 및 성능해석)

  • Kim, Moon-Chan;Chun, Ho-Hwan;Park, Won-Kyu;Byun, Tae-Young;Kim, Jong-Hyun;Suh, Sung-Bu
    • Journal of the Society of Naval Architects of Korea
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    • v.42 no.3
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    • pp.290-298
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    • 2005
  • A study of design and analysis for the POD type waterjet is conducted. The analysis and design of waterjet system are more difficult than that of conventional propulsor because waterjet is complicatedly composed of many parts which are impeller, stator, inlet, nozzle, etc. The streamline method is traditionally used in the design of pump whose characteristics are similar to those of waterjet. This streamline method, however, has some limitation in analysis of a viscous flow as well as the interaction of inlet part of hull. In the present study, the developed CFD program is applied to the analysis of POD type waterjet. The developed program is first validated by comparing the existed experimental results. The designed waterjet system is also analyzed by the developed CFD program and analyzed results show that the performance of the present POD type waterjet is above the requirement.

A Comparative Analysis of Corporate Governance Guidelines: Bangladesh Perspective

  • Rahman, Md. Musfiqur;Khatun, Naima
    • Asian Journal of Business Environment
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    • v.7 no.2
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    • pp.5-16
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    • 2017
  • Purpose - The purpose of this research study is to make a comparative analysis between corporate governance guidelines 2016 and 2012 and area of further improvement to ensure better governance, accountability and transparency. Research design, data and methodology - This research study is mainly based on the corporate governance guidelines 2016 and 2012 issued by the regulatory authority known as Bangladesh Securities and Exchange Commission (BSEC). Results - This study finds that corporate governance guideline 2012 include some new issues such as criteria and qualification of independent director; some additional statements in the directors' report; mandatory requirement of separation of chairman and CEO; constitution of audit committee; chairman of audit committee; role of audit committee, duties of CEO and CFO on financial statements; and collection of compliance certificate from professional accountant or secretary in compare to corporate governance guidelines 2016. Conclusions - This study suggests that the regulatory authority should include more issues such as tax management and reporting, risk management and reporting; individual and overall performance analysis of the board and independent directors; separate nomination and compensation committee; assessment of true independence of the board and its supporting committees to ensure higher quality of corporate governance and transparency.

Corporate governance and corporate value of Entertainment enterprises (엔터테인먼트 기업의 지배구조와 기업가치)

  • Lee, Jae-Hyuck
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.6
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    • pp.1329-1336
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    • 2009
  • This study analyzes the relationships between majority shareholders equity ratio or foreign equity ratio and corporate value within the entertainment industry. Furthermore, an analysis is conducted between majority shareholders equity ratio or foreign equity ratio and accounting index with the same industry. Both analyses are conducted after referring the records of the relationships between corporate governance and corporate value in general industries. The result of this study is summarized as follows. First, foreign equity ratio and corporate size are found to be the most important variables in explaining corporate value of entertainment enterprises. Second, corporations with majority shareholders holding higher percentages show a positive difference in CFO.