This paper proposes a new method for estimating the symmetric axis of a pottery from its small fragment using surface geometry. For the automatic assembly of broken sherds, the axis estimation is an important measure [2]. When a fragment is small, it is difficult to estimate axis orientation since it looks like a patch of a sphere and conventional methods mostly fail, but the proposed method provides reliable axis estimation by using multiple constraints. The computational cost is also much lowered. To estimate the symmetric axis, the proposed algorithm uses three constraints: (1) the curvature is constant on a circumference CH. (2) the curvature is invariant in any scale. (3) also the principal curvatures does not vary on CH. CHis a planar circle which is one of all the possible circumferences of a pottery or sherd. A hypothesis test for axis is performed using maximum likelihood. The variance of curvature, multi-scale curvature and principal curvatures are computed in the likelihood function. We also show that the principal curvatures can be used for grouping of sherds. The grouping of sherds will reduce the computation significantly by omitting impossible configurations in pottery assembly.

This paper deals with the architecture, design and implementation of a management information tree (MIT) supporting efficient managed object (MO) selection. We present the architecture and mechanism of the MIT in detail and also show how the proposed architecture is implemented in a telecommunication management network (TMN) platform. In addition, we present a new mechanism decreasing MO selection delay, named class level filtering (CLF). The main idea of CLF is to use the class information of MO to exclude the scoped instances of improper MO classes from the conventional filtering. Analysis and performance tests in various cases are presented. The results show the superior performance of the MIT and CLF.

Network management systems which administer actual network resources are developed based on a software system called network management platforms. Network management platforms provide major functions defined in TMN and interfaces to develop network management systems. Our research designs and implements a network management platform suitable to the TMN environment of today and tomorrow. This platform increases the efficiency in handling management information by completely separating managed object class information from instance information. In addition, the performance of the platform is significantly improved through a multi-structured management information tree (MIT) and a multi-staged arrangement of the execution of common management information services (CMIS). Furthermore, our platform allows a new management information base (MIB) to be added to the managed system in run-time, solving the problem of having to recompile and restart the network management system. In our research, we develop a new concept of class level filtering, which yields relatively high performance as the MIT becomes larger.

One of challenges of the WATM is providing the negotiated QoS during handoff. It should be considered that the virtual connection cannot always meet guaranteed QoS in wireless environment during/after the handoff execution due to mobility management, limited radio resources and fluctuating network conditions. Micro cell size, which produces more handoff makes it more difficult. An adaptive QoS management scheme is required in order to minimize dropping the virtual connection. We design a handoff network model and cell structure for seamless handoff scheme in WATM networks. In order to realize adaptive QoS management we also adapt the dynamic state at which QoS re-negotiation is executed to meet the negotiated QoS during handoff. In order to localize the impacts of handoff and enable fast and reliable handoff we design the seamless handoff scheme which provides efficient inter-cluster handoff and propose location management with multi-tier addressing based on the network model for QoS-based multimedia services.