27987792
The Study and Analysis of Joint Adaptive Clock Recovery Mechanism for TDMoIP
TDM over IP (TDMoIP) is an effective method for transparently transporting time division multiplexed (TDM) signals over IP-based networks. Clock recovery mechanism is essential for it. This paper briefly introduces the Timing requirement and principle of clock recovery, describes an improved adaptive clock recovery mechanism combined with timestamps and buffer data offset, presents the derivational process and analyzes how to deal with IP-based networks characteristics. Finally, the simulation results showed that the performance of this improved clock recovery mechanism can reach a high level and meet the requirement of the TDM service standard.
7931157
A Heuristic Approach to Reconstruct Triangle Mesh from Unorganized Point Cloud
A heuristic algorithm was presented to reconstruct triangle mesh from unorganized point cloud, and a new error evaluation rule was presented to measure the reconstruction errors. The triangle meshes were reconstructed through two phases of mesh growing based on different strategies, where regions with high point density usually grow at the first phase and the remaining regions grow later. In each phase of mesh growing, the smoothest regions always grow firstly and then largely avoid errors emerging in sharp regions. The reformative best point selection method can improve the topology and geometry quality of the reconstructed meshes. The presented error estimation was inspired by the level of detail model and was also can be used in other region grow reconstruction approaches. Experiments show that the algorithm is efficient and effective.
35950271
Partition Triangle Meshes into Coarsely Quadrangular Segmentation
A feature captured approach was presented to automatically partition a triangle meshes into a coarsely quadrangular segmentation. The triangle meshes was firstly partitioned into a polygonal segmentation which was further split into triangular and quadrangular patches. After the convex and concave features were identified, the triangular patches were eliminated according to their topological relations to achieve the quadrangular segmentation. The optimization methods based on globally smooth parameterization and active contour model were also adopted to improve the qualities of quadrangular patches and their edges. The final segmentation consisted of pure-quadrangular patches with appropriate sizes according to the model's geometric characteristics, and the features of input model werewell captured.
42801293
Evaluation of an ultra-wide bandwidth wireless indoor non-line-of-sight channels
24862782
A Robust Load Balancing Pattern for Grid Computing
Availability of grid resources is dynamic, which raises the need to develop robust and effective applications against changing circumstances. The paper proposes a robust load balancing pattern and centralized control task scheduler is discussed. Based on improving fault tolerant service on request chain processing, the paper enhances ORBUS1.1 software with load balancing service. Simulation results show that the implementation is able to obtain high system performance with central-control task scheduling and MAXPERFORMpolicy.
10165712
A Novel Secure Routing System in Overlay Environment
Routers are effective building blocks for Internet. It is almost impossible to modify router software only for applications. How to satisfy applications’ specific requirements of communication is a big problem. Now more and more systems begin to place application oriented routing service on overlay networks. This paper compares several overlay routing systems based on route number and brings forward a novel routing system based on trust model. System design principles are discussed and system simulation performance is analyzed. The results show that the system is able to provide secure routing service to applications in the case of vicious nodes.
6133036
Serial hook-ups: a comparative usability study of secure device pairing methods
Secure Device Pairing is the bootstrapping of secure communication between two previously unassociated devices over a wireless channel. The human-imperceptible nature of wireless communication, lack of any prior security context, and absence of a common trust infrastructure open the door for Man-in-the-Middle (aka Evil Twin) attacks. A number of methods have been proposed to mitigate these attacks, each requiring user assistance in authenticating information exchanged over the wireless channel via some human-perceptible auxiliary channels, e.g., visual, acoustic or tactile.
 In this paper, we present results of the first comprehensive and comparative study of eleven notable secure device pairing methods. Usability measures include: task performance times, ratings on System Usability Scale (SUS), task completion rates, and perceived security. Study subjects were controlled for age, gender and prior experience with device pairing. We present overall results and identify problematic methods for certain classes of users as well as methods best-suited for various device configurations.
18255542
A new method to obtain the shift-table in Boyer-Moore’s string matching algorithm
The Boyer-Moore algorithm uses two pre-computed tables for searching a string: skip, which utilizes the occurrence heuristic of symbols in a pattern, and shift, which utilizes the match heuristic of the pattern. Researchers have pointed out that the difficulty of understanding the computation of the shift table has hindered utilization of the algorithm in a wider range of applications. This paper describes an alternative way to compute the shift table. We believe that the new method is more intuitive and straightforward both conceptually and logically than the original method, and thus, easier to understand and to implement. Also, the new method has O(m) complexity in both required space and time for a pattern of length m. Therefore, it preserves the high performance of the Boyer-Moore algorithm.
14783345
Designing of LED Illuminating System and Testing Notice
With the development of LED, LED lighting has been gradually developed to commercial stage for its advantage of non-pollution, long life, easy to transport, and other advantages. Because of uneven development of LED industry in China and some engineering staff is short of professional knowledge, which result in the LED lighting was used inappropriately and unreasonable and unqualified phenomenon of the LED lighting system. This paper was based on the principles and characteristics of LED lighting, discussed the LED lighting system design process and points for attention, combined with experience in engineering practice, and provided suggestions to resolve some related problems. We hope to help the engineering staff of LED lighting system design.