• Title/Summary/Keyword: Rank system

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A NOTE ON THE RANK 2 SYMMETRIC HYPERBOLIC KAC-MOODY ALGEBRAS

  • Kim, Yeon-Ok
    • The Pure and Applied Mathematics
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    • v.17 no.1
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    • pp.107-113
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    • 2010
  • In this paper, we study the root system of rank 2 symmetric hyperbolic Kac-Moody algebras. We give the sufficient conditions for existence of imaginary roots of square length -2k ($k\;{\in}\;\mathbb{Z}$>0). We also give several relations between the roots on g(A).

Customized Web Search Rank Provision (개인화된 웹 검색 순위 생성)

  • Kang, Youngki;Bae, Joonsoo
    • Journal of Korean Institute of Industrial Engineers
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    • v.39 no.2
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    • pp.119-128
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    • 2013
  • Most internet users utilize internet portal search engines, such as Naver, Daum and Google nowadays. But since the results of internet portal search engines are based on universal criteria (e.g. search frequency by region or country), they do not consider personal interests. Namely, current search engines do not provide exact search results for homonym or polysemy because they try to serve universal users. In order to solve this problem, this research determines keyword importance and weight value for each individual search characteristics by collecting and analyzing customized keyword at external database. The customized keyword weight values are integrated with search engine results (e.g. PageRank), and the search ranks are rearranged. Using 50 web pages of Goolge search results for experiment and 6 web pages for customized keyword collection, the new customized search results are proved to be 90% match. Our personalization approach is not the way that users enter preference directly, but the way that system automatically collects and analyzes personal information and then reflects them for customized search results.

Consistency Check of a House of Quality Chart by Limiting Probability Concept and Median Rank (극한확률의 개념과 Median Rank를 이용한 HOQ 도표의 일관성 검정)

  • Won, Yu-Woong;Kim, Ki-Young;Yun, Deok-Kyun
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.33 no.3
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    • pp.22-29
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    • 2010
  • Six sigma has been the most influential management innovation tool in order to achieve the customer's satisfaction and keep the competition in the age of limitless competition. The success in six sigma is to find the correct CTQ (Critical to Quality). QFD (Quality function deployment) is the efficient too ever created to tie product and service design decisions directly to customer wants and needs. One of the mistakes in QFD is to analyze using an inconsistent HOQ (House of quality) chart. An inconsistent HOQ chart is one in which the information from the correlation matrix is inconsistent with that from the relationship matrix. This study presents the consistency check and inconsistency check in case of failing the consistency check. Also we propose the procedures using the Limiting Probability in correlation matrix and the Median Rank in relationship matrix in order to be consistent in HOQ chart.

Novel MIMO Communication Scheme for Enhanced Indoor Performance in Distributed Antenna Systems

  • Cho, Bong-Youl;Kim, Jin-Young
    • Journal of electromagnetic engineering and science
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    • v.10 no.4
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    • pp.263-269
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    • 2010
  • Multiple input multiple output (MIMO) has been considered one of the key enablers of broadband wireless communications. The indoor environment is known to be favorable to ensure both high rank property and high signal-to-interference/noise ratio (SINR) to fully exploit MIMO spatial multiplexing (SM) gain. In this paper, we describe several practical deployment cases where repeater links (or relay links), such as those present with an indoor distributed antenna system (DAS), can act as keyholes to degenerate the rank property of MIMO communications. In this case, we cannot exploit MIMO SM gain in indoor environment. We propose a novel MIMO communication scheme which uses simple converter in the devices in repeater links to resolve the rank degeneration issue and to ensure MIMO SM gain in highly MIMO-favorable indoor environment. MIMO SM is possible over the indoor DAS with single cable line through use of simple converters, which enables practical deployment in real fields.

Design of Decision Support System for Propensity of User in MOBA using Modified PageRank Algorithm (MOBA 게임의 불량 플레이어 판단을 위한 위한 PageRank 알고리즘 기반의 의사결정 시스템 설계)

  • Shim, Jae Youn;Kim, Seong-Whan
    • Proceedings of the Korea Information Processing Society Conference
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    • 2014.04a
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    • pp.1026-1029
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    • 2014
  • MOBA (Multiplayer Online Battle Arena) 기반의 게임 서비스는 현재 가장 관심을 받고 있는 게임 장르의 한 종류이다. MOBA 장르와 같은 게임들은 플레이어의 실력도 중요하지만 같은 팀원간의 협력과 전략이 중요한 요소 중에 하나이다. 이러한 상황에서 악의적의 의도로 자신의 비정상적인 플레이를 한다거나 욕설 등의 팀의 사기를 저하시키는 플레이어들이 문제가 되고 있다. 이러한 플레이어들의 제재를 위해 몇 가지 시스템들이 제안 되고 있지만 그들에 대한 판단은 쉽지 않다. 그래서 본 논문에서는 PageRank 를 기반으로 하는 불량 플레이어의 판단에 대한 보조 시스템을 제안 한다. 이 시스템의 MOBA 게임 플레이어의 플레이 횟수, 신고 횟수, 신고 받은 횟수 등의 자료들을 이용하여 플레이어의 Judgment Points 와 Bad Player 지수를 파악하며 이를 기반으로 생성된 Bad Player 랭킹을 통하여 불량 플레이어 검색에 도움을 줄 것으로 예상된다.

Reliability Analysis for Power Plants Based on Insufficient Failure Data (불충분한 고장 데이터에 기초한 발전소의 신뢰도 산정기법에 관한 연구)

  • 이승철;최동수
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.7
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    • pp.401-406
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    • 2003
  • Electric power industries in several countries are currently undergoing major changes, mainly represented by the privatizations of the power plants and distribution systems. Reliable operations of the power plants directly contribute to the revenue increases of the generation companies in such competitive environments. Strategic optimizations should be performed between the levels of the reliabilities to be maintained and the various preventive maintenance costs, which require the accurate estimations of the power plant reliabilities. However, accurate estimations of the power plant reliabilities are often limited by the lack of accurate power plant failure data. A power plant is not supposed to be failed that often. And if it fails, its impact upon the power system stability is quite substantial in most cases, setting aside the significant revenue losses and lowered company images. Reliability assessment is also important for Independent System Operators(ISO) or Market Operators to properly assess the level of needed compensations for the installed capacity based on the availability of the generation plants. In this paper, we present a power plant reliability estimation technique that can be applied when the failure data is insufficient. Median rank and Weibull distribution are used to accommodate such insufficiency. The Median rank is utilized to derive the cumulative failure probability for each ordered failure. The Weibull distribution is used because of its flexibility of accommodating several different distribution types based on the shape parameter values. The proposed method is applied to small size failure data and its application potential is demonstrated.

Resolving the Ambigities in World Sense by using Automatic Keyword Network in Information Retrieval (정보검색에서의 어의 중의성 해소를 위한 자동 키워드망의 이용)

  • Kim, Jung-Sae;Jang, Duk-Sung
    • The Transactions of the Korea Information Processing Society
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    • v.7 no.12
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    • pp.3855-3865
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    • 2000
  • The automatic indexing is a compulsory part for the text retrieval system. However it is impossible to rank the appropriate texts at top. Furthermore, it is more difficult to prevent to rank the inappropriate texts having homonyms at top by only the automatic indexing. In this paper, we proposed the two-level retrieval system to enhance the retrieval efficiency, in which Automatic Keyword Network (AKN) is used at the second-level process. The firsHevel search is carried out with an inverted index file generated by the automatic indexing. On the other hand the second-level search exploits AKN based on the degree of asslxiation between terms. We have developed several formulas for rearranging the rank of texts at second-level search, and evaluated the performance of the effects of them on resolving the word sense ambiguities.

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The Effect of Rating Criteria of Construction Skilled Workers' Rank System on Policy Purpose (건설기능인등급제의 등급기준이 정책목표에 미치는 영향)

  • Kim, Myeongsoo;Kim, Taehoon
    • Korean Journal of Construction Engineering and Management
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    • v.24 no.4
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    • pp.35-43
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    • 2023
  • This study is aiming to analyze the relevance of rating criteria and these criteria may have effects on policy purpose of 'Construction Skilled Workers' Rank System', that are inflow of new comer, improvement of job performance, and decrease job-change. Closely related systems, electronic card system and prevailing wage system, are considered by assuming three scenarios, although they are not introduced yet. Empirical survey shows that the relevance is above average. The empirical result of regression also predicts that policy target might be mostly satisfied. Policy purpose is regressed on rating criteria, they are career, qualification, education and training, award. Career and award have positive impact on inflow of new comer. All four criteria have significant impacts on improvement of job performance. Award has strong effects on decreasing job-change. Especially, when electronic card system and prevailing wage system are adopted simultaneously with 'Construction Skilled Workers' Rank System', the level of satisfaction of policy purpose would be higher.

Performance Improvement Methods of a Spoken Chatting System Using SVM (SVM을 이용한 음성채팅시스템의 성능 향상 방법)

  • Ahn, HyeokJu;Lee, SungHee;Song, YeongKil;Kim, HarkSoo
    • KIPS Transactions on Software and Data Engineering
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    • v.4 no.6
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    • pp.261-268
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    • 2015
  • In spoken chatting systems, users'spoken queries are converted to text queries using automatic speech recognition (ASR) engines. If the top-1 results of the ASR engines are incorrect, these errors are propagated to the spoken chatting systems. To improve the top-1 accuracies of ASR engines, we propose a post-processing model to rearrange the top-n outputs of ASR engines using a ranking support vector machine (RankSVM). On the other hand, a number of chatting sentences are needed to train chatting systems. If new chatting sentences are not frequently added to training data, responses of the chatting systems will be old-fashioned soon. To resolve this problem, we propose a data collection model to automatically select chatting sentences from TV and movie scenarios using a support vector machine (SVM). In the experiments, the post-processing model showed a higher precision of 4.4% and a higher recall rate of 6.4% compared to the baseline model (without post-processing). Then, the data collection model showed the high precision of 98.95% and the recall rate of 57.14%.

RankBoost Algorithm for Personalized Education of Chinese Characters on Smartphone (스마트폰 상에서의 개인화 학습을 위한 랭크부스트 알고리즘)

  • Kang, Dae-Ki;Chang, Won-Tae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.1
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    • pp.70-76
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    • 2010
  • In this paper, we propose a personalized Chinese character education system using RankBoost algorithm on a smartphone. In a typical Chinese character education scenario, a trainee is supplied with a finite number of Chinese characters as an input set in the beginning. And, as the training session repeats, the trainee will notice her/his difficult characters in the set which she/he hardly answers. Those characters reflect their personalized degrees of difficulty. Our proposed system constructs these personalized degrees of difficulty using RankBoost algorithm. In the beginning, the algorithm start with the set of Chinese characters, of which each is associated with the same weight values. As the training sessions are repeated, the algorithm increase the weights of Chinese characters that the trainee mistakes, thereby eventually constructs the personalized difficulty degrees of Chinese characters. The proposed algorithm maximizes the educational effects by having the trainee exposed to difficult characters more than easy ones.