• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.623-625
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• 1999

개방형통신망은 통신 서비스 및 통신망 자원 관리 등의 설계, 개발 및 구축에 관련되는 논리적 기본 구조를 제시함으로써, 효율적인 망 관리와 컴포넌트 개념의 핵심인 소프트웨어이 재사용을 통한 신속한 신규 서비스의 제공을 가능하게 한다. 본 논문에서는 통신망 관리 객체와 서비스 관리 객체를 객체 단위로 공유하거나 접속 할 수 있도록 하기 위해 소프트웨어 계층적 구조로 모델화한 병원시스템을 제시한다.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2001.11a
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• pp.169-171
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• 2001

본 논문에서는 XML(eXtensible Markup Language)을 위한 데이터 모델을 제시하기 위해 현재 광범위하게 사용되고 있는 관계형 데이터베이스(relational database) 개념을 적용한다. 관계형 데이터베이스는 업무 요구사항의 분석으로부터 고수준의 개념적 데이터 모델을 사용해서 데이터베이스에 대한 개념적 스키마(conceptual schema)를 생성한 다음, 고수준 개념적 데이터 모델을 구현 데이터 모델로 변환하여 논리적 데이터베이스 스키마를 생성한다. 이때, 고수준 개념적 데이터 모델링의 대표적인 방법으로 ER모델을 사용하고, 구현 데이터 모델로 관계 모델(relation model)을 사용한다. XML은 문서의 논리적 구조를 정의하는 DTD와 XML Schema 등을 갖는다. XML의 DTD와 정보 모델링 기법인 E/R 모델은 모두 작은 세계(real world)를 모델링하는 도구들이라고 할 수 있다. 본 논문에서는 XML의 DTD와 E/R 모델의 구성요소들을 분석하여 서로 사상(mapping)시키는 'XML을 위한 데이터 모델(A Data Model for XML)'을 제시한다. 최종적으로 제시된 XML을 위한 데이터 모델에 의해 작은 세계(real world)을 모델링하는 XML DTD에서 정의한 구조(XML Structure)을 따르는 유효한 XML문서(validate XML document)들은 관계형 데이터베이스에 저장할 수 있게 된다.

• Journal of the Korean Society for information Management
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• v.9 no.2
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• pp.118-153
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• 1992

This study att.empts to conduct a system an;~lysis and dcsign for circt~lation control in a univcr~ity library. In this proccss, structured sysltcm analys15 tcrhn~clucs Iikr data flolv diagrnms. data dictiomiry, and entity - relationship analysis, arc. vmploycd to construct both concqitual and p h p c a l data models of current and new circulation systems. Thc whole design aims at an al~tomntctf c~r.culation system on thc [nlcro-compurcr --basis in a mid dle - sized library.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.2
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• pp.445-453
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• 2005

The design process of a relational database system consists of requirement analysis, conceptual design using ER diagram, logical design, and physical design. In logical design process, the conceptual schema is transformed to relational schema, and relational schema is normalized. This traditional design process is hard to applied in real database design process, since there is an ambiguity in conceptual design process. In this paper, we suggest a new design process, which provides more structural design steps by removing the conceptual design process. In new approach, we produce the data flow diagram by the structural methodology. From the attributes in the data store of data flow diagram, we construct relational table schema, and we normalize relational schema. Finally we produced table relationship diagram in order to figure out relationships between tables.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.43 no.1 s.343
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• pp.13-16
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• 2006

We have proposed and experimentally demonstrated the all-optical composite logic gates with XOR, NOR, OR and NAND functions using SOA-MZI structures to make it possible to simultaneously perform various logical functions. The proposed scheme is robust and feasible for high speed all-optical logic operation with high ER.

• Annual Conference on Human and Language Technology
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• 1999.10e
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• pp.242-248
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• 1999

이 논문은 지역적 동사구 분할에 바탕을 두고 서술어가 문말에 위치하는 언어에 특성에서 기인하는 속성을 반영하는 부분적 그러나 빠른 구문분석에 관해 논한다. 즉 완벽성 보다는 신속함 그리고 신뢰에 바탕을 둔 새로운 한국어 구문분석에 대해 논의한다. 기존의 문법이론 대신 한국어의 형태적 통사적 특성에 기인한, 성분들의 분할(partitions)에 의한 단위 (chunks) 분석방법을 제안한다. 근간은 동사구 장벽(VP-barrier) 알고리즘이며, 이 알고리즘은 한 문장안에서의 다양한 동사의 파생접사에 의해 형성되는 관형화, 명사화, 부사화 등의 파생구조와 내포된 동사구(인용문, 종속문 등)에 의해 형성되는 지역적 동사구내에서 그 성분들의 논리적인 분할을 구성하고 다시 그 다음 요소와 체계적으로 결합하는 관계로 확장하여 가능한 구조들을 생성한다. 다시 언어의존적인 발견적 규칙(heuristics)들을 점수화하여 가장 높은 점수의 단위구조를 적격한 구조로 선택한다. 이 방법은 하위범주화 및 의미정보를 사용하지 않는, 빠른 구문분석이 요구되는 시스템을 위해 고안되었으며, 집단적인 노력이 아닌 개인적인 노력 및 최소의 자원으로도 최대의 효과를 얻을 수 있다는데 그 의의가 있다.

• Journal of The Korean Association For Science Education
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• v.34 no.7
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• pp.647-655
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• 2014

The purpose of this study is to acquire teaching insights for improving scientific literacy by analyzing the effects of scientific communication skills, science process skills, and logical thinking skills of elementary school students on academic achievement level. The participants are 64, sixth grade elementary school students. Survey materials include the results of Scientific Communication Skill Test (SCST), Test of Science Process Skills (TSPS), Group Assessment of Logical Thinking (GALT), multiple choice test & short answer test, descriptive answer test on science, and academic achievement level test on all subjects. Based on these data, the study analyzed the relationships of science process skills, logical thinking skills, and scientific communication skills, and each category's effect on academic achievement level. Furthermore, under the assumption that scientific communication skills are affected by science process skills and logical thinking skills and directly influence the academic level, the research discovered three types of correlations as a structural model. The results show that there are considerable correlations in scientific communication skills, science process skills, and logical thinking skills. Also, these three abilities have meaningful correlations with learner's writing and descriptive question level on science curriculum and overall academic achievement level; the level of correlation differ a bit by subcategory factors. In conclusion, setting the model, science process skills and logical thinking skills influence scientific communication skill, and the skill directly influences the learner's academic level. Further analysis of the results show that scientific communication skill influences the academic achievement level of all subjects the most.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.7B
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• pp.422-430
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• 2007

WDM-PON has been receiving much attention as a key technology to FTTH. As the cost of WDM-PON heavily depends on the number of transceivers implemented at ONU, one of its shortcomings comes from the fixed provision of wavelength resource, which is tightly coupled with costly transceivers. In this paper, we propose a cost-effective WDM-PON architecture for dynamic resource provision. The proposed architecture is based on hierarchical grouping of multiple ONUs into a logical group and hierarchical sharing the resource. For high utilization of dynamic resource, the dynamic resource allocation algorithm is also proposed. We analyze the system efficiency in term of dynamism of system resource and system cost. We also verify that the proposed resource allocation algorithm achieves a high dynamism on resource allocation, and at the same time maintains the fairness between ONUs.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.4
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• pp.231-237
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• 2015

However XML languages can logically define the type of structure with their's own grammar, it is inadequate to use them as a tool for conceptual model that represents the semantics of data and the relationships between the data in the real world. In this paper, we propose conceptual modeling techniques, called CMXML, for modeling the XML schema at the conceptual level. For this purpose, we define the model formally, and provide a way to represent the model in a graphical and text form. We also propose an mapping methodology providing transformation from CMXML to XML schema to show the feasibility of the proposed model.

• Journal of KIISE:Software and Applications
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• v.35 no.6
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• pp.366-373
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• 2008

The web ontology language(OWL) has been used by ontology designers to construct ontology. In order to derive hidden information(concept subsumption, concept satisfiability and realization) of OWL ontology, a number of OWL reasoners have been introduced. But most reasoners simply report these information without process for any arbitrary entailment and unsatisfiable concept derived from a OWL ontologies. In this paper, we propose Minimum Expression Axiom Set(MEXS) detection and storing for debugging unsatisfiable concepts in ontology. In order to detect MEXS, we need to find axiom to cause inconsistency in ontology. Therefore, our work focused on two key aspects: given a inconsistency ontology, identifying the roots of axioms to occur unsatisfiable and derived axioms from among them; and extracting MEXS. Our results can be applicable to all application, which is at the basis of the description logic.