• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.7
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• pp.1459-1466
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• 2009

In ubiquitous environment, various and amount of sensor data information occur continuously and periodically about thing and user from RHO, sensor network of various space. Such, the users from among many of provider who provide sensor service should find service that themselves is wanted. And when service use, service right to user should be provided. But in the current environment of the USN(Ubiquitous Sensor Network) Application Service, there is no the registry to find these services but only business- oriented UDDI(Universal Description Discovery, and integration). In addition, when service use, service right to user should be provided but current services provided only services one of the conditions or events. Therefore, rules-based processing system of service event that can provide service according various conditions and events is need. In this paper research into service registry for sensor service search with reference to existing UDDI and event processing system for USN application service with reference to event rule based on web service as WS-ECA(Web Service-Event Condition Action).

• Nuclear Engineering and Technology
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• v.48 no.1
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• pp.114-128
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• 2016

The development of operational performance indicators is of utmost importance for nuclear power plants, since they measure, track, and trend plant operation. Leading indicators are ideal for reducing the likelihood of consequential events. This paper describes the operational data analysis of the information contained in the Corrective Action Program. The methodology considers human error and organizational factors because of their large contribution to consequential events. The results include a tool developed from the data to be used for the identification, prediction, and reduction of the likelihood of significant consequential events. This tool is based on the resilience curve that was built from the plant's operational data. The stress is described by the number of unresolved condition reports. The strain is represented by the number of preventive maintenance tasks and other periodic work activities (i.e., baseline activities), as well as, closing open corrective actions assigned to different departments to resolve the condition reports (i.e., corrective action workload). Beyond the identified resilience threshold, the stress exceeds the station's ability to operate successfully and there is an increased likelihood that a consequential event will occur. A performance indicator is proposed to reduce the likelihood of consequential events at nuclear power plants.

• Journal of Internet Computing and Services
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• v.8 no.6
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• pp.55-73
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• 2007

Importance of coordination among heterogeneous devices is significantly increasing to meet the challenges presented by the evolvement of the ubiquitous computing environment. The web services technology is going up as a promising solution to support the inter-operability between such heterogeneous devices via well-defined protocol. Currently, ECA(Event-Condition-Action) rule based framework for coordinating devices is proposed, it is called as WS-ECA(Web Services-ECA) framework. This framework was basically based on the web services and proposed the ECA based rule language, And this also proposed the framework that could enable the device coordination based on proposed rule language. In this paper, we propose the protocol among the components of WS-ECA framework to support dynamic feature for ubiquitous environment, and we also propose WSDL extension to support service and event descriptions these are provided in components of this framework.

• Journal of Service Research and Studies
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• v.4 no.1
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• pp.49-59
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• 2014

Context-aware computing is an emerging paradigm to achieve ubiquitous computing environments by enabling computer systems to understand their situational contexts. A context-aware system uses context to provide relevant information and services to the user depending on the user's task. In this paper, we propose an ontology-based context-aware modeling methodology that transmits low-level contexts acquired by directly accessing various sensors in the physical environments to high-level contexts. With these high-level contexts, context-aware application can provides proactive and intelligent services using ECA (Event-Condition-Action) rules. We implemented a home robot service in smart office environment.

• The Journal of Society for e-Business Studies
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• v.13 no.3
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• pp.1-20
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• 2008

Today's computing environment which is getting distributed to communicate with various systems needs dynamic inter-connectivity of the systems. MOM(Message Oriented Middleware) is popularly used for transmitting XML messages among the distributed systems for the inter-connectivity. But, they do not support event-based message routing functionalities with XML transformation for processing effective message routing, which is essential to inter-connectivity, and there is no integrated platform to cope with these requirements. Although event-based message routing and XML transformation have been studied in a wide range of computer science areas, development of message routing systems is considered as a tough job due to the technological difficulties. In order to address these requirements, we proposed a novel system, named RMRS(Rule-based Message Routing System), which supports event-based message routing as well as XML message transformation. To make the proposed system easy to use, we also redesigned ECA(Event- Condition-Action) rule to fit in our system and developed a tool to map source XML structure into target XML structure.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.223-225
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• 1998

실시간 감시(monitor) 및 제어(control) 시스템의 데이터베이스는 계속적으로 감지기(sensors)에 의해 갱신된다. 연속적인 데이터의 변화에 의한 제약조건(constraints) 위반은 시스템에 심각한 문제를 발생시킨다. 이러한 시스템의 감시 및 제어를 능동적(active)으로 제공하기 위한 기능의 보편적인 형태로 능동규칙(Active rules)을 사용한다. 능동규칙은 정의된 사건(event)이 발생하면, 데이터베이스 상태의 변화에 대한 조건(condition)에 의해 행동(action)을 수행한다. 무결성(integrity) 제약조건을 능동규칙으로 선언함으로써 데이터베이스의 상태를 감시 및 제어하는 것이다. 일반적으로 사용되어온 능동규칙은 제한적인 시간상 무결성 제약조건 검사를 허용하고 있으며, 최근 능동규칙을 사용하여 시간상 연속적인 데이터베이스의 변화에 대한 제약조건 및 트리거(trigger)를 제공하기 위한 연구의 필요성이 대두되고 있다. 이 논문은 사건 빈도와 연합된 시간상에 연속적인 데이터베이스 상태 변화의 확장된 시간조건 상술을 지원하는 시간능동 규칙을 제안한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.6
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• pp.1101-1105
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• 2006

Ubiquitous computing network comprises a variety of distributed service devices. Today Web services technology enables the heterogeneous devices to provide their own services and interact with each other via well-defined Internet protocol. Nevertheless, service devices in ubiquitous environments require more event-driven, autonomous interaction beyond rather passive service-oriented architecture of the present time. This paper presents an ECA (Event-Condition-Action) rule description language in an attempt to support capability for autonomous interactions among service-oriented devices in ubiquitous computing network. Specifically, the proposed WS-ECA is an XML-based ECA rule description language for web service-enabled devices. The rules are embedded in distributed devices which invoke appropriate services in the network if the rules are triggered by some internal or external events. The presented ECA-based device coordination approach is expected to facilitate seamless inter-operation among the web service-enabled devices in the emerging ubiquitous computing environment.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.175-181
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• 2006

컴퓨팅 디바이스의 존재를 의식 하지 않고 원하는 서비스를 제공 받을 수 있는 유비쿼터스 환경하에서는 최소한의 HCI 또는 배제된 HCI 가 요구된다. 이러한 요구를 충족시키기 위해 효율적인 서비스를 제공하는 시스템들은 추론을 통해 사용자의 의도 파악 및 그에 따른 서비스를 제공 할 수 있으나 그것에 대한 정확한 판단은 실질적으로 달성하기 어렵다. 또 다른 접근 방법으로는 Event-Condition-Action (ECA) Rule 형태 기반으로써 명확한 Event Trigger 와 Event 발생시의 상황 조건을 기반으로 이미 기술된 서비스를 제공하는 것이다. ECA에 의한 서비스의 제공은 확률 기반의 추론을 통한 서비스 제공보다 더욱 명확한 서비스 제공의 판단이 가능하나 복잡한 환경에서 방대한 양의 발생 가능한 모든 Rule에 대한 기술은 많은 노력이 필요하거나 심지어는 그것이 불가능하다는 단점을 갖고 있다. 이에 본 논문은 이러한 문제를 해결하고자 효과적인 서비스 제공을 위한 ECA Rule 자동 생성 기법을 소개하고자 한다. 본 논고에서 제안하는 시스템은 사용자의 행동과 상황을 추적 및 저장하여 그 정보를 바탕으로XML 형태의 ECA Rule을 자동 생성하여 그를 바탕으로 동일한 조건 및 상황 발생시 이미 기술된 서비스를 제공한다. 이러한 과정은 ECA Rule 기반의 서비스 제공 운용에 있어 가장 취약점인 ECA Rule 작성에 대한 사용자의 노력을 Rule의 양에 상관없이 손쉽게 해결 할 뿐만 아니라 각 사용자 별 Rule을 생성함으로써 유비쿼터스 환경하에서의 개인화된 서비스를 효율적으로 제공할 것이다.

• The KIPS Transactions:PartD
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• v.8D no.5
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• pp.513-522
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• 2001

Active database execute an action of active rule defined in advance which is triggered automatically, whenever an event with the matching event specifications occurs, its condition is evaluated. Because these rules may in turn trigger other rules, the set of rules may be triggered each other indefinitely, Therefore, we propose a termination analysis method to guarantee termination. This proposed method considers composite event as well as rule execution time. Above all, the method not only uses deactivation graph combined to trigger graph for exact analysis, but also improves the complexity of analysis. Also the proposed method enhances accuracy of analysis result.

• Transactions of the Korean Society of Automotive Engineers
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• v.9 no.3
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• pp.60-67
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• 2001

As a method of variable valve train(VVT), Electro-Mechanical Valve(EMV) has been studied. Compared with conventional VVT system, the EMV system has a relatively simple structure. The system has two electromagnets, springs and an armature. The system can be operated by reciprocal action between armature and two electromagnets. And, the operating event can be controlled by electrical signal from controller. Therefore, reduction of emission and fuel consumption can be achieved through valve event control at each engine operating condition. In this study, characteristics of EMV system were investigated by simulations and experiments. The results of simulation and experiment show that the core shape and material characteristics are dominant parameters on magnetic force and delay time. In order to apply the system to commercial engine, it has a compact size and high stiffness springs(50N/mm) to increase the valve speed. Because of high valve seating velocity, loud noise and high impact force generated, which can lead to reduction of actuator durability. Therefore, further research is required to reduce valve seating velocity.