• The Journal of Korean Association of Computer Education
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• v.7 no.3
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• pp.45-56
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• 2004

Java provides support for Web, concurrent programming, safety, portability, and GUI, so there is a steady increase in the number of Java users. Java is based on the object-oriented concepts such as classes, instances, encapsulation, inheritance, and polymorphism. However the JVM(Java Virtual Machine) hides most of the phenomena related to the concepts. This is why most of Java users have much difficulty in learning and using Java. As a solution to the problem, I have developed a tool Alpha that visualizes the phenomena occurred in the JVM from the standpoint of the concepts and will describe the design and features of the tool in this paper. For practicality and extendability Alpha has an MVC(Model-View-Controller) architecture and visualizes the phenomena such as object instantiations, method invocations, field accesses, cross-references among objects, and execution flows of threads in the various ways according to the levels and purposes of the users.

• The Transactions of the Korea Information Processing Society
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• v.7 no.9
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• pp.2857-2866
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• 2000

As software technology has made progress, object-oriented CASE tools have become more important. This paper presents the process and similarity in design and implementation of OODesigner, an object-oriented CASE tool, on three platfonns and outlines a kind of generic architecture for the design and the implementation of CASE tools. OODesigner is a tool that was initially developed to support OMT. An initial Unix version has been developed since 1994. In 1997, after the completion of the Unix version, we began developing a Java version and a Windows version supporting UML. The development of a CASE tool is a typical application of the Model-View-ControllerO'vIVC) paradigm. Thus, we obtained a common design pattern among the versions in the MVC point of views. This design similarity can be used to develop several kinds of CASE tools with the corresponding design notations.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.05a
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• pp.2-4
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• 2020

논블로킹 IO 를 활용한 웹 서비스를 위한 미들웨어 구축 방법은 2009 년 발표된 Node.js 에서 도입된 이후로 여러 언어 및 프레임워크로 전파되기 시작하였다. 자바 진영에서도 Project Reactor 를 통하여 논블로킹 IO 패러다임에 대응하기 시작하였고 이를 스프링 프레임워크로 구현한 WebFlux 가 출시되었다. 본 논문은 자바 기반의 웹서비스 구축 시 스프링 프레임워크를 활용한 블로킹 기법과 논블로킹 기법 간의 차이점을 살펴보고 성능을 분석한다. 이를 통해 가장 효율적인 성능을 발휘할 수 있는 아키텍처 모델을 도출한다.