• 제목/요약/키워드: Meta-structure

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An Ant Colony Optimization Approach for the Two Disjoint Paths Problem with Dual Link Cost Structure

  • Jeong, Ji-Bok;Seo, Yong-Won
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2008.10a
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    • pp.308-311
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    • 2008
  • The ant colony optimization (ACO) is a metaheuristic inspired by the behavior of real ants. Recently, ACO has been widely used to solve the difficult combinatorial optimization problems. In this paper, we propose an ACO algorithm to solve the two disjoint paths problem with dual link cost structure (TDPDCP). We propose a dual pheromone structure and a procedure for solution construction which is appropriate for the TDPDCP. Computational comparisons with the state-of-the-arts algorithms are also provided.

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Impedance-based health monitoring and mechanical testing of structures

  • Palomino, Lizeth Vargas;de Moura, Jose Dos Reis Vieira Jr.;Tsuruta, Karina Mayumi;Rade, Domingos Alves;Steffen, Valder Jr.
    • Smart Structures and Systems
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    • v.7 no.1
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    • pp.15-25
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    • 2011
  • The mechanical properties obtained from mechanical tests, such as tensile, buckling, impact and fatigue tests, are largely applied to several materials and are used today for preliminary studies for the investigation of a desired element in a structure and prediction of its behavior in use. This contribution focus on two widely used different tests: tensile and fatigue tests. Small PZT (Lead Titanate Zirconate) patches are bonded on the surface of test samples for impedance-based health monitoring purposes. Together with these two tests, the electromechanical impedance technique was performed by using aluminum test samples similar to those used in the aeronautical industry. The results obtained both from tensile and fatigue tests were compared with the impedance signatures. Finally, statistical meta-models were built to investigate the possibility of determining the state of the structure from the impedance signatures.

Management of the Structure Information of HyTime Documents using Object-Oriented Database (객체 지향 데이타베이스를 이용한 HyTime 문서의 구조 정보 관리)

  • 박인호;강현석
    • Journal of Korea Multimedia Society
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    • v.5 no.4
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    • pp.351-360
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    • 2002
  • HyTime(Hypermedia/Time-based Structuring Language), an international standard language to describe hypermedia electronic documents, is used to support the synchronization between various multimedia data for hypermedia applications. To manage the HyTime documents efficiently for shared environment, the logical structure information of them should be managed by database in a systematic way. In this Paper, we design a meta-database schema of HyTime DTDs(Document Type Definition) which define the logical structure of hypermedia documents and show how to manage the meta-database schema for storing the HyTime DTDs in the object-oriented database.

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A Study on Analysis of a Process Similarity for the Service Reuse (서비스 재사용을 위한 프로세스 유사도 분석에 관한 연구)

  • Hwang, Chi-Gon;Yun, Chang-Pyo;Jung, Kye-Dong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2014.05a
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    • pp.238-240
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    • 2014
  • A cloud computing include a SaaS frameworks be able to use a software as a service. Despite the existing service depending on the difference of the tenant and the use, if the service provider re-establish a service, they are required resources In terms of costs and managerial. So we propose a technique for analysis software structure using the process algebra to reuse existing software. A process algebra analyze the structure of the software, express in business process or different languages and verify that it can be reused. As CCS in a process algebra is useful to convert the business process or XML, by using this, we structure a process and propose meta storage for comparison and management a structured document.

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The Effect of Meta-Features of Multiclass Datasets on the Performance of Classification Algorithms (다중 클래스 데이터셋의 메타특징이 판별 알고리즘의 성능에 미치는 영향 연구)

  • Kim, Jeonghun;Kim, Min Yong;Kwon, Ohbyung
    • Journal of Intelligence and Information Systems
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    • v.26 no.1
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    • pp.23-45
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    • 2020
  • Big data is creating in a wide variety of fields such as medical care, manufacturing, logistics, sales site, SNS, and the dataset characteristics are also diverse. In order to secure the competitiveness of companies, it is necessary to improve decision-making capacity using a classification algorithm. However, most of them do not have sufficient knowledge on what kind of classification algorithm is appropriate for a specific problem area. In other words, determining which classification algorithm is appropriate depending on the characteristics of the dataset was has been a task that required expertise and effort. This is because the relationship between the characteristics of datasets (called meta-features) and the performance of classification algorithms has not been fully understood. Moreover, there has been little research on meta-features reflecting the characteristics of multi-class. Therefore, the purpose of this study is to empirically analyze whether meta-features of multi-class datasets have a significant effect on the performance of classification algorithms. In this study, meta-features of multi-class datasets were identified into two factors, (the data structure and the data complexity,) and seven representative meta-features were selected. Among those, we included the Herfindahl-Hirschman Index (HHI), originally a market concentration measurement index, in the meta-features to replace IR(Imbalanced Ratio). Also, we developed a new index called Reverse ReLU Silhouette Score into the meta-feature set. Among the UCI Machine Learning Repository data, six representative datasets (Balance Scale, PageBlocks, Car Evaluation, User Knowledge-Modeling, Wine Quality(red), Contraceptive Method Choice) were selected. The class of each dataset was classified by using the classification algorithms (KNN, Logistic Regression, Nave Bayes, Random Forest, and SVM) selected in the study. For each dataset, we applied 10-fold cross validation method. 10% to 100% oversampling method is applied for each fold and meta-features of the dataset is measured. The meta-features selected are HHI, Number of Classes, Number of Features, Entropy, Reverse ReLU Silhouette Score, Nonlinearity of Linear Classifier, Hub Score. F1-score was selected as the dependent variable. As a result, the results of this study showed that the six meta-features including Reverse ReLU Silhouette Score and HHI proposed in this study have a significant effect on the classification performance. (1) The meta-features HHI proposed in this study was significant in the classification performance. (2) The number of variables has a significant effect on the classification performance, unlike the number of classes, but it has a positive effect. (3) The number of classes has a negative effect on the performance of classification. (4) Entropy has a significant effect on the performance of classification. (5) The Reverse ReLU Silhouette Score also significantly affects the classification performance at a significant level of 0.01. (6) The nonlinearity of linear classifiers has a significant negative effect on classification performance. In addition, the results of the analysis by the classification algorithms were also consistent. In the regression analysis by classification algorithm, Naïve Bayes algorithm does not have a significant effect on the number of variables unlike other classification algorithms. This study has two theoretical contributions: (1) two new meta-features (HHI, Reverse ReLU Silhouette score) was proved to be significant. (2) The effects of data characteristics on the performance of classification were investigated using meta-features. The practical contribution points (1) can be utilized in the development of classification algorithm recommendation system according to the characteristics of datasets. (2) Many data scientists are often testing by adjusting the parameters of the algorithm to find the optimal algorithm for the situation because the characteristics of the data are different. In this process, excessive waste of resources occurs due to hardware, cost, time, and manpower. This study is expected to be useful for machine learning, data mining researchers, practitioners, and machine learning-based system developers. The composition of this study consists of introduction, related research, research model, experiment, conclusion and discussion.

A STDUY ON THE SURFACE MORPHOLOGY AND BOND STRENGTH OF DENTURE BASE RESIN TO COBALT-CHROMIUM ALLOY AFTER VARYING MODES OF SURFACE TREATMENT (COBALT-CHROMIUM 합금의 표면처리방법에 따른 레진 의치상의 접착강도 및 표면상태에 대한 연구)

  • Vang, Mong-Sook;Park, Young-Jon
    • The Journal of Korean Academy of Prosthodontics
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    • v.35 no.1
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    • pp.78-94
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    • 1997
  • The purpose of this experiment was to determine the effects of various treatments on denture base resin to metal bond for cobalt-chromium alloy. The metal surface was treated as follows. Group 1 : Sandblasted with $50{\mu}m$ aluminum oxide. Group 2 : Sandblasted with $250{\mu}m$ aluminum oxide. Group 3 : Sandblasted with $250{\mu}m$ aluminum oxide and followed by silicoating. Group 4 : Electrochemically etched. Group 5 : treated with oxidizing solution. Group 6 : Beaded with $200{\mu}m$ retention structure and followed by silicoating. All specimens were applied with 4-META resin and were thermocycled 1000 times at temperature of $5^{\circ}C$ to $55^{\circ}C$. The effects of various surface treatments on the bond strength between 4-META resin and metal interface were measured by using the universal testing machine. All specimens were observed with SEM. The results were as follows 1. The bond strength of 4-META resin were significantly higher to Co-Cr alloy. 2. The bond strength decreased in the following orders : group 6, group 3, groups 1 and 2, group 4, group 5 and there was no statistically significant difference in bond strength among groups 1 and 2.(p>0.05) 3. The bond strength of cobalt-chromium alloy to 4-META resin were not significantly different.(p>0.05) 4. The treated surface of groups 1, 2 and 3 has more fine undercut than that of groups 4 and 5 with SEM. 5. Stable adhesion can be achieved when mechanically roughened metal surface by sandblasting than treating in an electrochemical etching and an oxidizing solution with potassium manganate.

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The Effects of Acupuncture and Herbal Medicine for the Treatment of Whabyung: A Meta-analysis (화병치료에 대한 침과 한약의 효과에 대한 메타분석)

  • Kim, Yeri;Chung, Sun-Yong;Choi, Eun-Ji;Cho, Eun
    • Korean Journal of Clinical Pharmacy
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    • v.27 no.4
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    • pp.267-275
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    • 2017
  • Background and Objective: Whabyung is a Korean cultural disorder characterized by a combination of emotional stress and physical symptoms. Acupuncture, herbal medicines and other complementary medicinal treatments are used to treat the symptoms of whabyung. The purpose of this study is to investigate the effects of acupuncture treatment and herbal medicine treatments on anger, anxiety and depression of whabyung. Methods: Using PubMed, CENTRAL, AMED, MEDLINE, EMBASE, MEDLINE, CINAHL, Cnii, CNKI, J-SATGE, PsycArticles, KISS, KoreaMed, kmbase, NDSL, RISS, OASIS and Korean Traditional Knowledge Portal, articles published by March 2017 for whabyung or whabyung-related syndrome were searched. The quality of selected articles was evaluated using RoB and RoBANS. The effects of acupuncture and herbal medicines on anger, anxiety, and depression levels of whabyung patients were considered for meta-analyses. Results: Of the total 2408 articles retrieved from the database, 11 were finally selected and 4 articles were used for meta-analyses. Acupuncture reduced whabyung patients' anger and anxiety. Especially, the state anxiety was significantly reduced (effect size= -0.676, p= .026). Herbal medicine had effects on reducing anxiety and state anger while trait anger was increased without statistical significance. Conclusion: The present study showed the effectiveness of acupuncture and herbal medicines for whabyung patients in general. However, considering the limited availability of articles and the heterogeneity between them included for the meta-analysis, the results should be generalized with caution. In the future, more studies within the structure of evidence-based medicine need to be conducted to generate objective and valid evidences of korean medicine.

Studies of Meta-Expressions in Webcomics (웹코믹스의 메타표현에 관한 연구)

  • Kwon, Kyung-Min
    • Cartoon and Animation Studies
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    • s.16
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    • pp.211-221
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    • 2009
  • are cartoon-expressions called cartoon itself to show the characteristic and limit of the presentation system, cartoon, by constitution. These followings are typical examples. First, a character regarded as a cartoonist shows up in the cartoon and constitutes the readers' recognition of the cartoon by himself or herself. Second, the line dividing two cuts is transformed or destroyed and likened to another thing so that can help the readers understand the cuts are physical existence. Most of the approaches to cartoon criticism studies which have been done before are external analyses focused on how to use cuts, balloons, and the two-dimensional expression meaning the relationship between script and picture. The purpose of this research is understanding meta-expressions in online and offline cartoons based on these outcomes. The research on meta-expressions of cartoon is considered to help understanding about the structure of Webcomics and the expansion of expression field in media by examining the expressions of the genre called cartoon.

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A Design of TopicMap System based on XMDR for Efficient Data Retrieve in Distributed Environment (분산환경에서 효율적인 데이터 검색을 위한 XMDR 기반의 토픽맵 시스템 설계)

  • Hwang, Chi-Gon;Jung, Kye-Dong;Kang, Seok-Joong;Choi, Young-Keun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.3
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    • pp.586-593
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    • 2009
  • As most of the data configuration at distributed environment has a tree structure following the hierarchical classification, relative data retrieve is limited. Among these data, the data stored in a database has a problem in integration and efficient retrieve. Accordingly, we suggest the system that uses XMDR for distributed database integration and links XMDR to TopicMap for efficient retrieve of knowledge expressed hierarchically. We proposes a plan for efficient integration retrieve through using the XMDR which is composed of Meta Semantic Ontology, Instance Semantic Ontology and meta location, solves data heterogeneity and metadata heterogeneity problem and integrates them, and replaces the occurrence of the TopicMap with the Meta Location of the XMDR, which expresses the resource location of TopicMap by linking Meta Semantic Ontology and Instance Semantic Ontology of XMDR to the TopicMap.

Analysis of Problem-Solving Protocol of Mathematical Gifted Children from Cognitive Linguistic and Meta-affect Viewpoint (인지언어 및 메타정의의 관점에서 수학 영재아의 문제해결 프로토콜 분석)

  • Do, Joowon;Paik, Suckyoon
    • Education of Primary School Mathematics
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    • v.22 no.4
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    • pp.223-237
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    • 2019
  • There is a close interaction between the linguistic-syntactic representation system and the affective representation system that appear in the mathematical process. On the other hand, since the mathematical conceptual system is fundamentally metaphoric, the analysis of the mathematical concept structure through linguistic representation can help to identify the source of cognitive and affective obstacles that interfere with mathematics learning. In this study, we analyzed the problem-solving protocols of mathematical gifted children from the perspective of cognitive language and meta-affect to identify the relationship between the functional characteristics of the text and metaphor they use and the functional characteristics of meta-affect. As a result, the behavior of the cognitive and affective characteristics of mathematically gifted children differed according to the success of problem solving. In the case of unsuccessful problem-solving, the use of metaphor as an internal representation system was relatively more frequent than in the successful case. In addition, while the cognitive linguistic aspects of metaphors play an important role in problem-solving, meta-affective attributes are closely related to the external representation of metaphors.