Earticle

In Next Generation Wireless Networks (NGWN), lots of information, such as voice and video data, will be used in All-IP networks. It is important to note that in such environments, seamless service for users and handoff between heterogeneous networks must be taken into account. Therefore, in this paper, we propose a SePH (Seamless Proxy based Handoff) using PMIPv6-based proxy model, which is able to improve the performance of handoff in NGWN. The SePH can efficiently support seamless and IP-based mobility, by reducing the search process. The performance results show that our proposed scheme outperforms in terms of Quality of Service (QoS), such as throughput, handoff latency, packet loss, and signaling overhead, comparing to the existing schemes.

There has been active research on 3D broadcasting service with HD resolution (3D HDTV) in ATSC system. The 3D HDTV broadcasting system requires more bandwidth efficient transmission schemes because it should convey both left and right HD resolution images simultaneously in the finite 6MHz bandwidth. Recently more bandwidth efficient modulation and more reliable error correction codes have been considered for the 3D HDTV service. A modified ATSC transmitting system using the BCH and Irregular Repeat Accumulate (IRA) LDPC codes in [3]. The modified ATSC system has SNR gain over the conventional ATSC system but is not sufficient for 3D HDTV service. In this paper, we propose more advanced ATSC transmission schemes that use higher modulation such as 16-QAM and concatenated RS code and block LDPC codes. Compared with conventional ATSC system and the modified ATSC system in [3], the proposed system has about 2.97dB and 1.12dB SNR gain at the payload data rate of 19.44Mbps compared with the existing ATSC system and the modified ATSC system [3]. Also, the proposed scheme requires only 1.05dB power increase for the 3D HDTV service, which is reasonable SNR increase value and applicable to the advanced 3D high definition broadcasting realization in limited 6MHz bandwidth.

Engineering Drawing (ED) is a widely taught subject in the universities offering engineering degrees. The rise of the ratio between the ED course instructors and participants has driven a need towards automatic assessment of ED assignments. Our initial research discussed the technicalities of how automated marking can be achieved. As part of the whole assessment software, a comprehensive automated award system should be developed. This award system should imitate the methods of manual awarding implemented by actual ED tutors or lecturers. This should encompass checking a student’s work based on its correctness and creativity against the sample answer scheme provided. The mark has to be unbiased and inherent to the distribution of the overall marks. This paper will discuss case scenarios of ED in comparison to the answer scheme and how the awarding system should work in different scenarios. In order to develop these rules, we have created a simple module capable on reading simple circle or group of circle drawings. We will have several test cases of different drawings and conduct our study from these samples. The paper concludes with results of the experimentation and recommendations driven from the results.

A manycore processor architecture integrating multiple cores onto a single die has been widely used in almost all computer systems and academia and industry have worked on the architecture for high-performance and low-power implementation. The manycore architectures have been proposed and designed for overcoming diminishing return and for efficiently utilizing the exponentially increasing number of transistors available in nano-meter technology. Although the architecture has been investigated extensively, under the process variation that is now considered as a critical design problem in the nano-meter technology, performance characteristics and benefits of the manycore architecture are not well studied. In this paper, we develop an asymptotic analysis model for better understanding the performance characteristics of manycore processor architectures using Amdahl’s law under process variation in order to foresee their performance impact for a given workload characteristics (e.g. available parallelism). Through the asymptotic analysis based on the models proposed in this paper, we can make the architectural design decisions such as "the number of cores" and "core size", and further we can probe the possible research direction of optimizing the performance of manycore architectures at the future of high process variation era.

This paper proposes methods for detecting and tracking moving body parts such as the eyes, lips, and hands to enable natural interaction with smart phone platforms. For demonstrating these methods we have implemented a markerless-based augmented reality on an Android-based smart phone. For interaction the user does not use any extra appliances except for the natural movement of the eyes, lips and hands within the instantaneous field of view of the smart phone camera. To realize augmented reality, we developed state-of-the art computer vision algorithms to first detect and track the face using an Android API operating on the camera images, then we track the eye location within the face. We estimate the location of the lips rapidly by making inferences based on the information from the eye and face locations. Real-time detection of optimal locations of the movable bodily parts (such as hands) also use the smart phone camera. These methods allow the user to interact with virtual objects that are displayed on the smart phone. The demonstrated methods address current problems involving delayed detection time and unreliable tracking in markerless-based augmented reality applications. Our suggestions may serve to advance interaction control in smart phone augmented reality and serve as a platform for interface development.

The paper presents a new server system for a wireless LAN DMX to enhance diverse LED lighting effects. In order to enhance the capability to send DMX packets to the large number of DMX client devices, a new WDMX server system is proposed based on a NDIS miniport driver. Through the NDIS miniport driver rather than raw TCP/IP socket, the throughput of the server is increased because header sections of TCP/IP stack are removed. Even, the format of Ethernet frame is modified to use a new type of addressing scheme which can address the devices by universe ID and DMX ID value. The implemented server software program which also use thread technology and a flexible data structure can support up to 10,500 DMX channels with the refresh rate of 40msec. Experiment shows the results and performances about the WDMX server system. Last but not least, the WDMX server system shows possibilities which can be supported as many as we want to play in entertainment area.

In this paper, we propose peak demand management techniques for a smart community using different types of coordination mechanisms for coordination of multiple house agents working in the same environment. These algorithms use centralized model, decentralized model, hybrid model and Pareto resource allocation model for resource allocation. We modeled user comfort for the appliance based on user preference, the power reduction capability and the important activities that run around the house associated with that appliance. Moreover we compare these algorithms with respect to their peak reduction capability, overall comfort of the community, simplicity of the algorithm and community involvement and finally able to find the best performing algorithm among them. Our simulation results show that the proposed coordination algorithms can effectively reduce peak demand while maintaining user comfort. We confirm that using our proposed algorithms, the demand for electricity of a smart community can be managed intelligently and sustainably.

A message scheduling that determines a sending order in real-time networked control systems should make the cycle time as short as possible. Minimizing the scheduling time itself in dynamic communication environments is also crucial for improving the performance of the systems. The proposed smart message-scheduling scheme for real-time Ethernet PROFINET IRT networks can obtain the optimal cycle time while substantially reducing the scheduling time when applied to communication networks in vessels with various messages and update times. Unlike previous techniques, the proposed scheme has a novel feature that can be applied to networks with arbitrary topology.

The crucial contribution of the paper is the novel saturated throughput analysis of the IEEE 802.11 Distributed Coordination Function (DCF) in the presence of hidden stations. This approach involves a novel analytical model that is an extension to previous works by other authors which provide Markov chain analysis to IEEE 802.11 DCF. Hidden stations cause most collisions because stations cannot sense each other’s transmission and often send packets concurrently, resulting in significant degradation of the network performance. Under the existence of hidden stations, we also propose the previous model with some various assumptions and through a spatial-temporal analysis for saturated condition. The throughput analysis of our model is evaluated by comparision with NS2 simulations and found the model is accurate and suitable for both basic access and request-to-send/clear-to-send (RTS/CTS) access mechanisms.