Kwanjoong Kim

A study of object analysis in safety management zone

In this paper, we propose a study of analysis to the mobility of object such like pedestrian in safety management zone. If unusual situation is detected in safety management zone, it`s designed that previous agreed mission will be processed. By human resource, safety management zone cannot be detected continuously so that through the induction of such detection system the reliability of area can be obtained. Hence, in this paper we propose the reaction scheme to detect special situation by object detection. By using sensor based processing system proposed by this paper, the detection of mobility and unusual situation can be implemented.

A study of design mechanism for the alerting car accident

By mobile technique and vehicle industry development, vehicle service industry based on Intelligent network as telematics service will be more raised. Most of countries expect its industrial market so that many researches and standardization are being advanced. For the telematics service, the vehicle safety technique will be very important so that its research should be expected. Hence, in this paper, we propose a design mechanism for the alerting car accident to identify or avoid dangerous accident by the network of cars.

Energy Efficient Cluster Management Scheme for Ubiquitous Sensor Networks

The scheme proposed in this thesis organizes dynamically clusters at the time of events occurrence and maintains them. The other side, the existing cluster based USN (ubiquitous sensor networks) organize at the network initial time in a lump. So the existing method causes of much energy exhaustion. Therefore the scheme proposed in this thesis can be more efficient than the existing one in the aspect of the energy usage and the gathering and sending data. In order to efficiently process various events, the scheme proposed in this thesis divides a cluster when the other events occurred in the area which the cluster organized in. In another case, it merges clusters when a same event occurs in a different near cluster. Like above, the scheme of this thesis dynamically organizes clusters in the node centeredness. The simulation to evaluating the scheme shows that the scheme of this thesis increase the performance by maximumly 50% compared with the existing study.

A handover scheme based on HMIPv6 for b3g networks

By complementary integration of UMTS and WLAN, a beyond third generation (B3G) mobile network has been proposed to establish better global roaming environments. The integrations of UMTS and WLAN are classified into two groups: loosely-coupled and tightly-coupled. A tightly-coupled network demands lots of investment and considerable amount of time to construct. On the other hand, a loosely-coupled network is more scalable and easier to implement than a tightly-coupled one while it has critical drawbacks of packet loss and blocking of services due to handover delay. To alleviate these drawbacks, this paper proposes a handover scheme between UMTS and WLAN, which is based on HMIPv6. The performance of the proposed scheme is evaluated adding the handover time of each step, and the blocking probability is computed in each scheme. The proposed internetworking schemes performance based on HMIPv6 is two times more likely than that based on MIP.

A handover scheme in clustered cellular networks

There are two types of handovers for mobile users in the clustered cellular networks: inter-cluster and intra-cluster handovers. An inter-cluster handover which occurs as a result of mobile users migration between clusters gives rise to additional handover delay, because more complex handover mechanism should be performed by mobile network.In this paper, we analyze multi-layered cluster architecture and we study the effect of cluster size on the inter-cluster handover performance. Then we propose a new hard handover scheme for inter-cluster handover. For an inter-cluster hard handover, additional delay is required for new bearer setup and reroute calculation. When a mobile terminal (MT) call crosses a cluster boundary, the proposed scheme performs some preparatory activities before actual handover is requested. It results in fast hard handover. We also analyze its performance and show that it reduces forced termination probability.

A Handover Scheme Supporting the Buffer Management in B3G Networks

In B3G Networks, service users can use heterogeneous networks to receive various services. We propose a buffer management scheme for reliable services. Service users can use mobile services in wireless networks such like WLAN and UMTS. In this paper, we present the network structure implementing policy-based functions based PDP-PEP to control heterogeneous access networks. Also, we propose the ISHO for specific traffic class by the buffer management of access network. By the buffer management scheme on ISHO, it can manage the resource usage as well as resource balancing, and packet loss rate can be lowered in burst traffic period.

A dynamic qos management scheme in b3g networks

Service Level Agreement (SLA) management can be adapted to support the end-to-end QoS for service users in Beyond 3 Generation (B3G) networks. In B3G networks, SLA provides multiple service classes on access networks so that service classes should be managed to assure the service satisfaction for users. In this paper, we propose a dynamic QoS management scheme by IP traffic class controlling based on SLA in B3G networks. To manage dynamic traffic service, we consider Differentiated services (Diffserv) mechanism for the resource management by SLA. An IP service traffic class on SLA can be dynamically changed by Diffserv traffic management to support dynamic end-to-end QoS. Simulation results show that the proposed scheme has higher performance in comparison with non-dynamic management scheme.

A resource balancing scheme in heterogeneous mobile networks

Heterogeneous access networks in B3G networks can provide each proper network service to mobile users. Furthermore, mobile users can use not only a unique access network service, but also different hetero network services by connecting another access network. For using another access network service, mobile terminals must support hetero network system techniques. Hence, by this multiple system modes, mobile terminals are able to implement ISHO (Inter System Handover) for changing the network service. In the heterogeneous access network environment, new resource management can be adopted to control QoS management. In this paper, we propose a resource balancing management scheme by the ISHO to increase the network availability. From the numeric analysis, we compare the proposed scheme with a current scheme.

DEVS formalism: a hierarchical generation scheme

System reproduction model to the growing system structure can be provided to design modeling formalisms for variable system architectures having historical characteristics. We introduce a DEVS (Discrete Event System Specifications)-based extended formalism that system structure gradually grows through self-reproduction of system components. As extended-atomic model of a system component makes virtual-child atomic DEVS models, a coupled model can be derived from coupling the parent atomic model and virtual-child atomic models. When a system component model reproduces its system component, a child component model can receive its parent model characteristics including determined role or behavior, and include different structure model characteristics. A virtual-child model that has its parent characteristics can also reproduce its virtual-child model, which may show similar attributes of the grand-parent model. By self-reproducible DEVS (SR-DEVS) modeling, we provide modeling specifications for variable network architecture systems.