• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제14권1호
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• pp.52-62
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• 2008

임베디드 응용프로그램 개발의 적시성(time-to-market)을 위해, 기존 임베디드 응용프로그램의 재사용 기법과 각기 다른 플랫폼에 인터페이스 시켜주는 인터페이스용 미들웨어에 대한 연구가 활발히 진행되고 있다. 인터페이스용 미들웨어 연구로서 기존의 MT 프로젝트, Xenomai, Legacy2linux 기술들은 미들웨어에서 제공되는 API가 특정 운영체제에 종속되거나 API의 확장성을 제공하지 못한다는 한계점이 있다. 본 논문에서 제안하는 임베디드 시스템 인터페이스용 미들웨어는 운영체제에 대한 종속성을 제거하여 다양한 운영체제를 지원한다. 또한, 미들웨어의 확장 및 동적 재구성이 가능한 컴포넌트 기반 구조로 설계되어, 자원 제한적인 임베디드 시스템에서 응용프로그램을 효율적으로 실행시킬 수 있다. 본 논문에서 제안하는 미들웨어의 추가에 따른 응용프로그램의 실행 지연은 미들웨어 API의 실행 시 최소 $0.3{\mu}sec$에서 최대 $5{\mu}sec$ 정도이며, 이는 응응프로그램의 실행 성능에 큰 영향을 주지 않을 것으로 판단된다.

• 한국콘텐츠학회논문지
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• 제7권7호
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• pp.31-38
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• 2007

본 논문에서는 대용량 데이터 처리를 위한 XML 기반 RFID 미들웨어 시스템을 구현하였다. 개발된 RFID 미들웨어 시스템은 태그 데이터를 수집하는 리더 인터페이스, 태그 데이터를 의미있는 데이터로 가공하여 응용인터페이스에게로 전송하는 이벤트 매니저, 그리고 기존 응용과의 인터페이스를 위해 다양한 응용접근프로토콜을 지원하는 응용 인터페이스를 설계 구현하였다. 리더 인터페이스는 고정형 장비뿐만 아니라 핸드헬드 유형의 PDA형 리더도 지원하도록 어댑터 형태로 구현되었다. 구현된 미들웨어 시스템은 빠른 필터링 처리기능을 가지며, 응용프로그램 접근 프로토콜인 HTTP, XML, JMS, SOAP을 지원한다. 성능은 CPU 이용율 측면에서 성능을 입증하였다.

• 제어로봇시스템학회논문지
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• 제10권5호
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• pp.464-474
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• 2004

This paper proposes a middleware structure for the module-based personal robot, which can run on heterogeneous network interfaces and provides users easy interface-method regardless of underlying heterogeneous interfaces and convenient exchange of modules. The proposed middleware is divided into three layers of a streaming layer (SL), a network adaptation layer (NAL) and a network interface layer (NIL). The streaming layer manages application transactions using middleware services and provides user a uniform interfaces to the proposed middleware. The network adaptation layer manages a message-routing and provides naming service and it is a core of the proposed middleware. And the network interfaces layer manages dependent parts of heterogeneous network interfaces such as IEEE1394, USB, Ethernet, and CAN (Control Area Network). This paper implements the proposed middleware structure, where 3 types of interfaces of IEEE 1394, USB and Ethernet are used, and measures response times among those interfaces.

• 정보처리학회논문지D
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• 제18D권5호
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• pp.393-402
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• 2011

본 논문에서는 상황인식 시스템 개발에 필수적인 미들웨어의 설계와 적용에 관하여 논한다. 다양한 상황 데이터들을 처리할 수 있도록 트랜스듀서 인터페이스 프로토콜을 정의하고, 미들웨어 모듈 간 일관성 있는 데이터 처리를 위하여 메시지 기반의 미들웨어를 설계하고 구현하였다. 상황인식 미들웨어는 서비스 기반 구조로 설계되어서 모듈간 기능이 독립적이고 확장성이 뛰어나다. 또한 모듈 간 통신은 메시지를 이용하기 때문에 응용 프로그램 개발이 용이해진다. 본 논문의 상황인식 미들웨어는 교량의 구조물 건전성 감시 시스템에 적용하여 실험하였고, 미들웨어의 효용성을 확인하였다.

• 한국멀티미디어학회논문지
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• 제9권12호
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• pp.1617-1627
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• 2006

The concept of middleware for digital TV receivers is not new one. Using middleware for digital TV development has a number of advantages. It makes it easier for manufacturers to hide differences in the underlying hardware. It also offers a standard platform for application developers. Digital TV middleware enables set-top boxes(STBs) to run video, audio, and applications. The main concern of digital TV middleware is now to reduce its memory usage because most STBs in the market are small footprint. In this paper, we propose several ideas about how to reduce the required memory size on the runtime area of DTV middleware using a new native process technology. Our proposed system has two components; the Efficient Native Process Module, and Enhanced Native Interface APIs for concurrent native modules. With our approach, the required memory reduced from 50% up to 75% compared with the traditional approach. It can be suitable for low end STBs of very low hardware limitation.

• Journal of Biosystems Engineering
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• 제38권1호
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• pp.25-32
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• 2013

Purpose: The objective of this study is to develop a data middleware for u-IT convergence in agricultural environment monitoring, which can support non-standard data interfaces and solve the compatibility problems of heterogenous sensor networks. Methods: Six factors with three different interfaces were chosen as target data among the environmental monitoring factors for crop cultivation. PostgresSQL and PostGIS were used for database and the data middleware was implemented by Python programming language. Based on hierarchical model design and key-value type table design, the data middleware was developed. For evaluation, 2,000 records of each data access interface were prepared. Results: Their execution times of File I/O interface, SQL interface and HTTP interface were 0.00951 s/record, 0.01967 s/record and 0.0401 s/record respectively. And there was no data loss. Conclusions: The data middleware integrated three heterogenous sensor networks with different data access interfaces.

• 제어로봇시스템학회논문지
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• 제14권4호
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• pp.399-405
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• 2008

Recently, robot technology is actively going on progress to the field of various services such as home care, medical care, entertainment, and etc. Because these service robots are in use nearby person, they need to be operated safely even though hardware and software faults occur. This paper proposes a Fault-Tolerant middleware for a robot system, which has following two characteristics: supporting of heterogeneous network interface and processing of software components and network faults. The Fault-Tolerant middleware consists of a Service Layer(SL), a Network Adaptation Layer(NAL), a Network Interface Layer(NIL), a Operating System ion Layer(OSAL), and a Fault-Tolerant Manager(FTM). Especially, the Fault-Tolerant Manager consists of 4 components: Monitor, Fault Detector, Fault Notifier, and Fault Recover to detect and recover the faults effectively. This paper implements and tests the proposed middleware. Some experiment results show that the proposed Fault-Tolerant middleware is working well.

• 대한음성학회지:말소리
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• 제60호
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• pp.125-144
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• 2006

W3C announced a standard software architecture for multimodal context-aware middleware that emphasizes modularity and separates structure, contents, and presentation. We implemented a distributed multimodal interface system followed the W3C architecture, based on SCXML. SCXML uses parallel states to invoke both XHTML and VoiceXML contents as well as to gather composite or sequential multimodal inputs through man-machine interactions. We also hire Delivery Context Interface(DCI) module and an external service bundle enabling middleware to support context-awareness services for real world environments. The provision of personalized user interfaces for mobile devices is expected to be used for different devices with a wide variety of capabilities and interaction modalities. We demonstrated the implemented middleware could maintain multimodal scenarios in a clear, concise and consistent manner by some experiments.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1936-1939
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• 2004

This paper proposes streaming layer for personal robot's middleware. Under assumption that robot has open architecture, i.e. consists of modules created by different vendors and intercommunication between these modules is necessary, we have to consider that there are many different network interfaces. To make communication between modules possible it is necessary to develop new type of middleware. Such middleware has to support different platforms, i.e. OS, network interface, hardware, etc. In addition, it is necessary to implement effective interface between network and application in order to manage inter application communications and use network resources more effectively. Streaming layer is such interface that implements necessary functionality together with simplicity and portability. Streaming layer provides high level of abstraction and makes communication between distributed applications transparent as if are located in same module. With possibility of extension by user defined application interfaces it is suitable for distributed environments, i.e. module based architecture including small-embedded systems like as DSP board. To verify the proposed streaming layer structure it is implemented using C and tested.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 A
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• pp.159-162
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• 2003

In this paper, we present a middleware that using routing scheme that support easily for various type of network in a home network based heterogeneous network. The protocol presented in this paper, consist two layers that Network Adaptation Layer(NAL) to allow access varience networks and Network Interface Layer(NIL) to deal network dependent parts. The middleware presentedl in this paper, can easily send data to any digital appliance or receive data from any digital appliance by using our routing scheme.