Ilyoung Chong

Web-of-Objects Based User-Centric Semantic Service Composition Methodology in the Internet of Things

The general goal of the Web-of-Objects (WoO) is to simplify object and application deployment, maintenance, and operation of IoT infrastructures. WoO also aim to provide user-centric IoT service by enabling object virtualization and semantic ontology based service composition. In WoO, semantic modeling of objects plays a distinguished role in achieving interoperability of device and service through semantic ontology model. In this paper, we propose a semantic functional module for user centric service composition in WoO platform. We design an ontology model for virtual object (ViO); it is the physical representation of real world objects. Consequently, we present a user-demand based service composition by showing an use case of WoO. In the proposed semantic based service composition approach, virtual object and composite virtual object are the key entity; this class of objects allows composing services from heterogeneous objects by following a service composition algorithm. This algorithm creates composite service along with the semantic description of that service. The proposed approach of service composition enhances the collaboration of objects as well as services. In the proposed system, user can search a service using natural language through the user interface; on the other hand, the service composition module creates the service by selecting the required objects dynamically.

A Correlated Load Aware Routing Protocol in Mobile Ad Hoc Networks

In this paper, we investigate the load distribution in ad hoc networks for reducing the possibility of power depletion and queuing delay at a node with heavy load environments. We examine the efficiency of dominant ad hoc routing protocols from a point of load balancing. Based on the results from various simulations, we design a new Correlated Load-Aware Routing (CLAR) protocol that considers the traffic load, through and around neighboring nodes, as the primary route selection metric. Simulation results show that CLAR outperforms other popular protocols and is better suited for the heady load networks with low mobility.

Orchestration in Distributed Web-of-Objects for Creation of User-Centered IoT Service Capability

Enhancing the service provisioning capability in IoT, it has been considered essential to support user-centric service feature. A semantic ontology model representing device, resource and service is proposed to make the knowledge based relationship to denote applications on WoO platform. Virtual object (VO) is introduced to represent a logical object in reference with physical thing including device profiles. The composite virtual object are formed with the combination of multiple VOs and the physical location and neutral things are defined as Non-ICT entities, they are also transformed into virtual object to provide much detailed information and services. The paper includes the implementation results obtained after evaluation of the developed testbed from the WoO platform with their performance.

A User-Centric Knowledge Creation Model in a Web of Object-Enabled Internet of Things Environment

User-centric service features in a Web of Object-enabled Internet of Things environment can be provided by using a semantic ontology that classifies and integrates objects on the World Wide Web as well as shares and merges context-aware information and accumulated knowledge. The semantic ontology is applied on a Web of Object platform to virtualize the real world physical devices and information to form virtual objects that represent the features and capabilities of devices in the virtual world. Detailed information and functionalities of multiple virtual objects are combined with service rules to form composite virtual objects that offer context-aware knowledge-based services, where context awareness plays an important role in enabling automatic modification of the system to reconfigure the services based on the context. Converting the raw data into meaningful information and connecting the information to form the knowledge and storing and reusing the objects in the knowledge base can both be expressed by semantic ontology. In this paper, a knowledge creation model that synchronizes a service logistic model and a virtual world knowledge model on a Web of Object platform has been proposed. To realize the context-aware knowledge-based service creation and execution, a conceptual semantic ontology model has been developed and a prototype has been implemented for a use case scenario of emergency service.

A self-organized authentication architecture in mobile ad-hoc networks

Network security is considered one of the obstacles that prevent the wide deployment of ad-hoc wireless networks. Among many security problems, authentication is the most fundamental problem that has to be solved before any others. Some previous solutions requiring centralized entities were not scalable and others requiring physical encounter took a long time. We propose a new architecture, called the Secure Overlay Network (SON), for fully distributed authentication. The SON has scalability because it is constructed in a self-organizing manner. The SON also has NPC-reachability which makes the SON robust against Sybil attacks, and guarantees authentication service between any two nodes in the SON. Both NPC-reachability and simulation results confirm the effectiveness of our architecture.

WoO based user centric Energy Management System in the internet of things

In this paper we aim to propose a Web-Of-Objects (WoO) based Energy Management System (WEMS) for providing a solution to efficiently manage energy consumption in smart home environment. The general goal of the WoO is to simplify object and application deployment, maintenance and operation in Internet of Things infrastructures. WoO also intends to propose service architecture system to support an intelligent features through an objectification and virtualization of the physical things. Object virtualization ensures harmonization, federation and combination of objects as well as services in the WEMS. Semantic ontology plays a vital role in WoO for ensuring the information reusability, extensibility and interoperability among virtual objects. It enables WEMS to be easily deployable in the real environment. This system can be applicable to building, home and factory, particularly we consider a home environment in this paper.

A Schedule-based Multi-channel MAC Protocol for Wireless Sensor Networks

Due to the half-duplex property of the sensor radio and the broadcast nature of wireless medium, limited bandwidth remains a pressing issue for wireless sensor networks (WSNs). The design of multi-channel MAC protocols has attracted the interest of many researchers as a cost effective solution to meet the higher bandwidth demand for the limited bandwidth in WSN. In this paper, we present a scheduled-based multi-channel MAC protocol to improve network performance. In our protocol, each receiving node selects (schedules) some timeslot(s), in which it may receive data from the intending sender(s). The timeslot selection is done in a conflict free manner, where a node avoids the slots that are already selected by others in its interference range. To minimize the conflicts during timeslot selection, we propose a unique solution by splitting the neighboring nodes into different groups, where nodes of a group may select the slots allocated to that group only. We demonstrate the effectiveness of our approach thorough simulations in terms of performance parameters such as aggregate throughput, packet delivery ratio, end-to-end delay, and energy consumption.

Knowledge-based open Internet of Things service provisioning architecture on beacon-enabled Web of Objects

Web of Objects uses a semantic ontology to create and provide knowledge-based Internet of Things services in terms of virtual objects and composite virtual objects. The objects are created through virtualization with the use of semantic ontology to form the virtual objects, where multiple virtual objects are combined to form the composite virtual objects to offer the services. Beacon-enabled Web of Objects is the extension of the existing web that allows the beacon to broadcast the uniform resource identifier of the real-world object to the nearer mobile devices. Based on the user selection and request, the service is handled and offered by the Web of Objects platform; thus, an architecture on the beacon-enabled Web of Objects has been proposed in this article. To offer the knowledge-based services, a knowledge creation model has been presented. To realize the knowledge-based service features on the proposed architecture, a use case scenario has been presented and a conceptual semantic ontology model has been designed. Finally, to assess the features, a prototype has been implemented and demonstrated on the use case scenario.

Feasibility considerations of multipath TCP in dealing with big data application

In this paper we present an idea to handle big data in a better way. We consider Multipath TCP (MPTCP) to use all available paths simultaneously. MPTCP is a tailored form of TCP which aspire to improve throughput by sharing available resources smartly and fairly. The key concentration of this paper is to analyze the benefit of MPTCP over single path TCP for bandwidth and time sensitive applications as well as big data application. Our simulation shows that MPTCP can higher goodput by bandwidth aggregation, Couple Congestion Control(CCC) provide better throughput without being unfair to other legacy TCP flows and also portray that large receive buffer causes performance enhancement for relatively large RTT link. As a result, MPTCP can be a enormous addition in contrast with single path TCP in dealing with big data application.

Service composition using new DSON platform architecture for M2M service

M2M (Machine to Machine) service is a new type of service provided to users across data collection and control of sensor networks. The M2M service will develop into a new service type for surveillance, management and control of smart environments using home network devices, personal smart devices, and personal computers. Presently, studies of new platform architecture, that can provide M2M services, are very lack. This paper suggests a new M2M service platform using the e-DSON (enhanced Dynamic Service Overlay Network). And this paper also describes functions, object structure, and service flow of service composition using the e-DSON platform for the M2M service. The M2M service platform using e-DSON will support enhanced service functions, generality, compatibility, intelligence, and dynamic capability.