• Journal of the Institute of Electronics Engineers of Korea SD
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• v.49 no.4
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• pp.15-25
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• 2012

The research on the FPGA CAD tools in academia has been lacking practicality due to the underlying FPGA fabric architecture which is too simple and inefficient to be applied for commercial FPGAs. Recently, the database of placement positions and routing graphs on commercial FPGA architectures has been built, and provided for enabling the academic development of placement and routing tools. To extend the limit of academic CAD tools even further, we have developed the evaluation toolkit for the K-FPGA architecture which is under development. By providing interface for exchanging data with a commercial FPGA toolkit at every step of mapping, packing, placement and routing in the tool chain, the toolkit enables individual tools to be developed without waiting for the results of the preceding step, and with no dependency on the quality of the results, and compared in detail with commercial tools at any step. Also, the fabric primitive library is developed by extracting the prototype from a reporting file of a commercial FPGA, restructuring it, and modeling the behavior of basic gates. This library can be used as the benchmarking target, and a reference design for new FPGA architectures. Since the architecture is described in a standard HDL which is familiar with hardware designers, and read in the tools rather than hard coded, the tools are "data-driven", and tolerable with the architectural changes due to the design space exploration. The experiments confirm that the developed library is correct, and the functional correctness of applications implemented on the FPGA fabric can be validated by simulation. The placement and routing tools are under development. The completion of the toolkit will enable the development of practical FPGA architectures which, in return, will synergically animate the research on optimization CAD tools.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10b
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• pp.421-423
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• 2004

최근 국내의 인터넷사용인구는 3,000만 명에 육박하고 있으며 인터넷 뱅킹 또한 활성화되고 있음에도 불구하고 공과금의 인터넷 수납은 매우 저조하여 2%정도에 머물고 있다. 그 이유로는 업체마다 서로 다른 아키텍처로 개발하여 시스템 간 인터페이스가 어렵고 제공되는 서비스의 신뢰성이 떨어지기 때문이다 본 논문에서는 전자공과금 수납 시스템의 표준모델로 SEBPPA(Standard Electronic Bi11 Presentment and Payment Architecture)를 제안하고 그에 따른 시스템 구조를 설계하였다. 또한 실제 구축사례를 통하여 제안한 SEBPPA모델에 기반을 둔 시스템이 충분히 안정적인 서비스를 제공할 수 있으며 유지보수의 편의성, 시스템의 유연성을 증가시킴을 증명하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.448-451
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• 2009

최근 모바일 디바이스의 성능향상으로 모바일 웹 애플리케이션 구동환경이 개선되고 있다. 이에 따라 모바일 웹 애플리케이션 개발 수요가 국내외적으로 증가하고 있다. 하지만 기존 PC환경과 달리 개발 환경 및 표준에 대한 고려가 적어 많은 개발비용이 소모되고 있다. 본 논문에서는 MWeb-프레임워크를 통해 최근 각광 받고 있는 웹 개발 프레임워크 기반의 개발방법론을 제안하며 이와 더불어 다양한 디바이스에서 동일한 사용이 가능하도록 모바일 웹 표준을 준수하는 개발방법론을 제안한다. Ruby on Rails기반의 모바일 웹 개발 아키텍처를 정의하고 이를 바탕으로 모바일 웹 표준을 준수하는 애자일 개발방법론을 적용한 프로세스 모델을 제안하고 기존 웹 개발 프레임워크와 개발방법론을 비교, 평가한다. 제안한 프레임워크를 통하여 신속한 개발을 수행할 수 있으며 모바일 웹 표준 환경을 준수하여 모바일 웹 애플리케이션의 품질과 신뢰성을 획득할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.554-557
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• 2008

최근 모바일 디바이스의 웹 접근 환경이 PC환경과 동일한 프로토콜을 이용하는 형식으로 변화하고 있다. 이에 따라 많은 곳에서 모바일 웹 애플리케이션을 개발하고 있으나 모바일 웹 표준을 도입하여 개발을 수행하는 곳은 많지 않다. 본 논문에서는 최근 각광을 받고 있는 경량화 웹 애플리케이션 개발 프레임워크인 Ruby on Rails[1]를 기반으로 하여 최근 W3C에서 정의된 모바일 웹 표준을 준수하는 애자일 개발방법론을 제안한다. Ruby on Rails기반의 모바일 웹 개발 아키텍처를 정의하고 이를 바탕으로 모바일 웹 표준을 준수하는 애자일 개발방법론을 제안한다. 제안한 프레임워크를 통하여 개발을 수행할 경우 애자일 개발방법론을 도입함과 동시에 모바일 웹 표준 환경을 준수하여 모바일 웹 애플리케이션의 품질을 보증할 수 있으며 신뢰도도 획득하게 된다. 또한 다양한 디바이스에서 정상적인 구동이 가능하다.

• The KIPS Transactions:PartA
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• v.16A no.6
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• pp.443-452
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• 2009

Although 32-bit architectures are becoming the norm for modern microprocessors, 16-bit ones are still employed by many low-end processors, for which small size and low power consumption are of high priority. However, 16-bit architectures have a critical disadvantage for embedded processors that they do not provide enough encoding space to add special instructions coined for certain applications. To overcome this, many existing architectures adopt non-orthogonal, irregular instruction sets to accommodate a variety of unusual addressing modes. In general, these non-orthogonal architectures are regarded compiler-unfriendly as they tend to requires extremely sophisticated compiler techniques for optimal code generation. To address this issue, we proposed a compiler-friendly processor with a new addressing mode, called the dynamic implied addressing mode(DIAM). In this paper, we will demonstrate that the DIAM provides more encoding space for our 16-bit processor so that we are able to support more instructions specially customized for our applications. And we will explain the advanced architecture which has improved performance. In our experiment, the proposed architecture shows 11.6% performance increase on average, as compared to the basic architecture.

• Journal of Internet Computing and Services
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• v.15 no.1
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• pp.45-53
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• 2014

UI-Mashup is widely used as a service method to add value, which is composed of distributed various contents on the internet and has turned out to be one of the latest trends in web application program development. Previous UI-Mashup-related studies have focused primarily on the dynamic service composition and have not been able to adapt to a rapidly changing Web Standard, thusthe end users conclude that UI-Mashups are slow, incompatible and poor security services. In this study, We propose an architecture for the performance improvements of UI-Mashup.In order to provide fast services and security enhancements, the proposed architecture collects UI fragments on the server in parallel, and sends layouts and contents of Mashups UI to the client through a special delivery channel supporting fast reaction and response time. In this study, the implementation and performance tests were proceeded to verify the proposed architecture experimentally. As a result of the performance testing, the proposed architecture has two to three times faster response time and more than four times throughput compared to the previous UI-Mashup technology.

• Journal of the Korea Society for Simulation
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• v.16 no.1
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• pp.49-57
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• 2007

Service-Oriented Architecture(SOA) is improving rapidly in IT Environment. Enterprise companies interest in implementation infrastructure based on SOA to adapt quick changes of large and complex distributed environment. SOA is a component model that inter-relates the different functional units of an application, called services, through interfaces and contacts between theses services. In this paper, we studied the concept of the relationship between SOA and standard web service core and therefore, we model the web service based on SOA. We implemented the application and business service architecture using web service that include the XML and SOAP. We confirmed that how the each SOA characters like interoperability, reusability, scalability and flexible business process adapted to web service and present a web service modeling that is maintained the neutrality using loose service coupling through the method of service model process and web service architecture designing methodology based on SOA.

• Journal of KIISE:Computing Practices and Letters
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• v.16 no.3
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• pp.257-262
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• 2010

SOA (Service-Oriented Architecture), which has become very popular recently, is a new paradigm for software development and application. In this paper, we propose an integrated architecture which is able to effectively manage and control a variety of services for U-City projects focusing on the importance of service integration. SOA has a number of important features such as loose coupling, standard bases, and distributed computing, all of which are the essential elements for merging and providing various services in U-City projects. We exploit the ESB (Enterprise Service Bus) for reflecting those features, which is a core module linking mutually heterogeneous components so that the communication of services can be implemented. In this paper, we discuss the necessity of SOA in U-City services and a possible scenario and method for the implementation. Finally, we propose an integrated architecture for the U-City Integration and Management Center.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.9
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• pp.2124-2130
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• 2014

The standard for DGPS reference station system defined by RTCM is in the current version of 1.2. This standard currently supports only GPS of the United States. However, the current operating GNSS satellite consisted of not only GPS, but also GALILEO of Europe, GLONASS of Russia, QZSS of Japan, BeiDou of China and so on. Therefore, the existing standard is not able to support them. Accordingly, a new standard in the version of RTCM's RSIM 1.3 is established in order to provide correctional services to GNSS satellites. In this paper, the version of RSIM 1.3 is analyzed and the software for DGNSS reference station architecture supporting the version of RSIM 1.3 is designed.

• Information and Communications Magazine
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• v.30 no.9
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• pp.65-71
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• 2013

스마트폰이 본격적으로 도입 활용되면서 서비스가 특정 플랫폼이나 환경에 제한 되지 않도록 하는 서비스 접근성을 만족하는 것이 스마트 서비스 제공의 중요한 목표가 되었다. 또한, 개발자들이 복잡한 앱 기술 보다 HTML5등 기존 웹 개발 기술을 활용하고 네이트브 앱에서 제공하던 단말 기능을 웹 기술로 사용 가능하도록 제공하는 기술이 많은 관심을 받고 있다. 전자정부 모바일 표준프레임워크는 이러한 요구사항을 만족하기 위하여 AJAX 프레임워크와 하이브리드 앱 기반의 실행환경을 도입하였다. 또한, 개발자 편의성을 위한 개발환경, 재사용성 증대를 위한 공통컴포넌트, 가이드 프로그램을 제공한다. 모바일 전자정부 표준프레임워크는 여러 공공서비스에 활용 되어 왔으며, 공공정보화 분야와 민간 기업 환경에서 핵심적인 기반 플랫폼 역할을 수행하고 있다. 본 논문에서는 모바일 표준프레임워크에서 활용된 기반 기술, 적용 아키텍처 및 주요기능, 활용사례에 대해서 소개하고자 한다.