• 한국공작기계학회논문집
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• 제11권4호
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• pp.19-25
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• 2002

As computer-related technologies have been developed, legacy design systems have not been appropriate far new computing environment. It is necessary that most of them are either modified or newly developed. However, these activities require quite much amount of cost and time. This paper presents a method of extending legacy design systems to the internet without any modification using XML and XSLT. We have been extended legacy systems in the two viewpoints. First, an XML document has been defined to present the input information of a legacy system which is executed on the consol environment - MS DOS, for example. Also, an XSLT document has been generated to transform an XML document to the input document of the legacy system An XML document is transformed to the input document by XSLT processor according to the transformation rules defined in the XSLT document. This technique to generate input documents is independent to the platform type and facilitates to link legacy systems to other systems. Second, a legacy system controller has been made to control a legacy system and developed a web service to extend it and its controller. The legacy system controller operates it automatically. The web service provides its functions to other systems via internet. We have applied the developed methodologies to the legacy gear design system 조ich calculates AGMA gear rating md made AGMA gem rating web service.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 추계학술대회(한국공작기계학회)
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• pp.257-262
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• 2001

As computer-related technologies have been developed, legacy design systems have not been appropriate for new computing environment. Therefore, it is necessary that most of them are either modified or newly developed. However, this requires quite much amount of cost and time. This paper presents a method of extending legacy design system without modification using XML and XSLT. In order to apply the developed method, a good example of legacy design systems, AGMA gear rating system has been extended so as to be suitable for the distributed computing environment. An XML document for AGMA gear rating process is defined. It is transformed to the form of the input document of AGMA gear rating system by XSLT processor according to the transformation rules defined in the AGMA gear rating XSLT document. After that, AGMA gear rating system reads this input document and generates an output document in the server. These operations are automatically executed by the external legacy system controller without user interactions. Using these operations, AGMA gear rating web service has been developed based on SOAP and WSDL to provide the functions of legacy AGMA gear rating system through the distributed network. Any system or user can implement AGMA gear rating process independently to the platform type, without making it for oneself, by simply referring the AGMA gear rating web service via Internet.

• 대한임베디드공학회논문지
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• 제5권1호
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• pp.23-28
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• 2010

The automotive industry tries to provide infotainment systems to emerging automobiles. Since the infotainment systems require various peripheral devices and network connectivity, legacy operating systems such as Linux and Windows can be much preferred due to its plentiful device drivers and multimedia applications while the operating systems following OSEK standard are used for automotive electronic control units. Thus it is highly desired that the system software supporting infotainment applications can be portable over different legacy operating systems providing unified programming interfaces. The majority of legacy operating systems support POSIX interfaces for application development. MOST is an automotive network standard for infotainment systems. Network Service defines the protocol stacks for MOST control data, which is essential to implement infotainment applications over MOST. In this paper, we suggest a POSIX-based Network Service so that we can utilize legacy device drivers and applications for automotive infotainment systems. We measure the performance of the POSIX-based Network Service and show that its overhead is not significant.

• 정보처리학회논문지D
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• 제16D권4호
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• pp.583-594
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• 2009

현재 기업이나 조직에서 적용할 수 있는 SOA(Service-Oriented Architecture, 이하 SOA)는 조직의 요구사항을 분석하여 비즈니스 모델을 설정하고 후보 서비스를 식별하여 필요한 서비스를 찾거나 개발하는 하향식 방법론(top-down methodology)이 대부분이다. 이 경우 기존의 시스템을 버리고 새로운 SOA를 도입하기에는 비용과 시간면에서 모험이 따를 수 있으므로 기존의 시스템을 최대한 이용하면서 점차적으로 SOA에 적합한 시스템으로 변환하기를 원한다. 본 논문에서는 기존의 레거시 시스템을 SOA에 적합한 웹서비스 형태로 만들기 위한 M-LSWS (A Method for Migration of Legacy System into Web Service)를 제안한다. M-LSWS는 레거시 시스템이 가지고 있는 디자인 명세 및 코드를 기반으로 비즈니스 프로세스를 분석하고 후보 서비스를 식별하여 재사용 가능한 웹서비스로 변환하는 절차를 정의하였으며 실제 SOA에 적합한 웹서비스 변환에 목적을 두고있다. 제안한 방법은 레거시 시스템 분석, 재사용 가능 서비스 도출 및 명세, 서비스 래핑, 서비스 등록의 네 단계로 이루어지며 단계별 프로세스와 가이드라인에 제시되고 도서관리 시스템에 적용함으로써 제안한 방법론의 타당성을 평가하여 본다.

• ETRI Journal
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• 제36권2호
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• pp.264-270
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• 2014

This paper introduces a novel repetitive delivery scheme for the left and right views in service-compatible (SC) 3D video that provides full backward compatibility to a legacy DTV system while retaining HD 3D visual quality without additional bandwidth or a codec over the legacy broadcasting channel. The proposed SC delivery scheme transmits individual view sequences of a 3D video in interlaced form, that is, a left-view sequence of a 3DTV program to be used repeatedly is transmitted first and stored locally, and the right-view sequence of the 3D program is then transmitted. This paper specifically describes the signaling, synchronization, and storage format methods used to validate the proposed SC delivery scheme. The experiment results show that the proposed SC delivery scheme can be effectively applied for an SC 3DTV service without degrading the DTV quality using only legacy DTV platforms.

• 정보보호학회논문지
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• 제23권2호
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• pp.299-305
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• 2013

물리적 일방향 자료전달 기술은 망간 분리 기술 중 하나로 외부망에서 내부망으로의 데이터 전송회선 자체를 제거하여 외부망을 통한 침입 가능성을 원천적으로 차단한다. 하지만 이로 인해 물리적 일방향 자료전달 기술을 적용하면 양방향 통신을 기반으로 제작된 레거시 서비스를 사용할 수 없다. 레거시 서비스를 운용하기 위해서는 서비스를 지원하는 별도의 에이전트가 필요하다. 하지만 에이전트 개발은 내부 프로토콜 공개, 추가적인 비용 등의 어려움이 존재한다. 본 논문에서는 이런 문제를 해결하기 위해 현장 제어시스템에서 운용 중인 레거시 서비스를 분석하여 세 가지 형태로 분류하였다. 분류를 바탕으로 세 가지 형태의 서비스를 지원하는 에이전트를 자동 생성할 수 있는 방법과 이를 기반으로 한 에이전트 자동 생성 도구의 설계를 제시한다.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2009년도 추계학술발표논문집
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• pp.181-184
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• 2009

기업의 비즈니스 시스템은 수시로 변화하는 고객의 요구사항과 새로운 기반기술의 출현 등에 따라 끊임없이 변화하고 있다. 따라서 기업은 비즈니스 환경변화에 유연하고 신속하게 대응할 수 있는 환경을 필요로 하고 있다. SOA는 이러한 요구에 적합하도록 설계된 아키텍처이다. SOA(Service Oriented Architecture)는 비즈니스를 세분화하여 반복 가능하고 가치를 지닌 단위 서비스들로 나누어 조립과 통합을 통해 새로운 가치를 만들어 낼 수 있도록 지원한다. 하지만 비즈니스 시스템의 많은 부분을 차지하던 Legacy 시스템에 이러한 아키텍처를 적용하기에는 많은 어려움을 가지고 있다. 본 논문에서는 Legacy 시스템으로부터 SOA의 서비스를 추출하는 방법을 제안한다. 서비스를 추출하는 과정은 3가지 단계를 거친다. 첫 번째 단계는 COBOL로 제작된 Legacy 시스템의 프로그램에서 DATA DIVISION으로부터 변수를 분류 및 그룹화하고 PROCEDURE DIVISION의 루틴간의 연관관계를 파악하여 객체화시킨다. 두 번째 단계에서는 첫 번째 단계에서 얻어진 변수들 중 핵심 변수를 식별하여 객체화를 통해 식별된 로직에서 서비스가 될수 있는 로직을 식별한다. 마지막으로 세 번째 과정은 식별된 서비스와 데이터를 사용하여 SOA 서비스를 구축한다.

• East Asian Economic Review
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• 제23권3호
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• pp.285-309
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• 2019

Unlike the popular belief, digital transformation mainly gets stymied by legal and regulatory issues related with legacy institutions in Asia rather than technical difficulties. The real challenges triggered by the PSD2 (Payment Services Directive 2) are how the region would overcome the overly fragmented, centralized, and hierarchical legacy framework to allow necessary changes to respond to the digital single market initiatives as promulgated by the European counterpart. The PSD2 is expected to bring about substantial changes in the payment ecosystem by allowing payment service providers to access customers' accounts and transactions information via API that have been traditionally controlled by banks. This paper suggests an incentive-compatible mechanism design for open collaboration among legacy institutions in the region to help them adapt to the PSD2. As evidenced by case studies in Korea, the Asian equivalent of PSD2 can be implemented and further expanded to create region-wide PCS (payment-clearing-settlement) network by reconnecting the dots of legacy infrastructures. These decentralized, diverse, small payment networks can be further combined with the expanded RTGS-CDS platform to evolve into the next phase of Asian Financial Network.

• 한국컴퓨터정보학회논문지
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• 제21권10호
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• pp.107-114
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• 2016

In this paper, we propose the building method for the unified IoT service platform between the variety of legacy systems with the heterogeneous structures and the operating environments. To accommodate the structural diversity of legacy systems, we develop a virtual integrated structure and interface abstracting method. By this, the new platform can use the data sources of the legacy systems as if the data source is in the new platform. In a manner without modification of the legacy systems with performing minimum tasks, we proposes a model that can be integrated without affecting the availabilities of the legacy systems.

• 한국정보시스템학회지:정보시스템연구
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• 제30권3호
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• pp.65-91
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• 2021

Purpose In this study, we investigated the impact of perceived risk and switching costs on switching intention to cloud service based on PPM (Pull-Push-Mooring) model. Design/methodology/approach We focused on revealing the switching factors of the switching intention to the cloud services. The switching factors to the cloud services were defined as perceived risk consisting of performance risk, economic risk, and security risk, and switching costs consisting of financial and learning costs. On the PPM model, we defined the pull factors consisting of perceived usefulness and perceived ease of use, and the push factor as satisfaction of the legacy system, and the mooring factor as policy supports. Findings The results of this study as follows; (1) Among the perceived risk factors, performance risk has a negative effect on the ease of use of pull factors, and finally it was found to affect the switching intention to the cloud services. Therefore, cloud service providers need to improve trust in cloud services, service timeliness, and linkage to the legacy systems. And it was found that economic risk and security risk among the perceived risk factors did not affect the switching intention to the cloud services. (2) Of the perceived risk factors, financial cost and learning cost did not affect the satisfaction of the legacy system, which is a push factor. It indicates that the respondents are positively considering switching to cloud service in the future, despite the fact that the respondents are satisfied with the use of the legacy system and are aware of the switching cost to cloud service. (3) Policy support was found to improve the switching intention to cloud services by alleviating the financial and learning costs required for cloud service switching.