Search

Software GUI testing for laboratory programs is a cumbersome and time-consuming task. In the past studies, a systematic approach for the efficiency issue of testing the laboratory work has not been discussed. In this paper, we propose a learning framework based on the RankBoost learning-to-rank approach to facilitate the verification task by learning to prioritize GUI test cases. In the experiments, we collected Android laboratory programs to investigate the effectiveness of the proposed learning framework. The experimental results show that the proposed learning framework can effectively improve the recall performance based on pairwise priority relations.

Coaxial metal-oxide-semiconductor (MOS) Au-Ga2O3-GaN heterostructure nanowires were successfully fabricated by an in situ two-step process. The Au-Ga2O3 core-shell nanowires were first synthesized by the reaction of Ga powder, a mediated Au thin layer, and a SiO2 substrate at 800 degrees C. Subsequently, these core-shell nanowires were nitridized in ambient ammonia to form a GaN coating layer at 600 degrees C. The GaN shell is a single crystal, an atomic flat interface between the oxide and semiconductor that ensures that the high quality of the MOS device is achieved. These novel 1D nitride-based MOS nanowires may have promise as building blocks to the future nitride-based vertical nanodevices.

Multimedia application integrates a variety of media, namely, audio, video, images, graphics, text and data. The ATM (Asynchronous Transfer Mode) technique has been recommended by the CCITT as the transport vehicle for BISDN (Broadband Integrated Service Digital networks) which is designed to provide multimedia traffic services. In this work we study some of the ATM-compatible multiple access MAN (Metropolitan Area Network) protocols, including DQDB (Distributed Queue Dual Bus, also known as IEEE 802.6), CRMA (Cyclic Reservation Multiple Access), DQMA (Distributed Queue Multiple Access), and FDQ (Fair Distributed Queue), and their performance for different kinds of multimedia application, including interactive education, on-line medical information system, and video conferences. We found that all four protocols achieve maximum throughput even at extremely high data rate, which make them suitable for carrying multimedia traffic in high speed networks.

Multimedia applications integrate a variety of media namely, audio, video, images, graphics, text, and data, each of which has different quality of service (QoS) requirements. To study the support of multimedia traffic on high speed protocols, we examine two significant metrics: delay fairness and worst-case delay performance. Four members of reservation-based high speed protocols are studied DQDB (distributed queue dual bus), CRMA (cyclic reservation multiple access), DQMA (distributed queue multiple access), and FDQ (fair distributed queue). The first part of this work presents delay fairness study of the protocols under various input traffic. Both access delay and message delay experienced by individual network nodes are measured to illustrate their fairness performance. The second part conducts worst-case delay experiments. Too worst-case scenarios of a test message are studied. The delay experienced by this message under varied inter-node distance is measured. The simulation results show that DQDB has the worst fairness performance. CRMA and DQMA present mixed results. FDQ proves itself to be a very fair protocol. The results also suggest that to there is no singe metric to justify a new protocol. Comparing our results with previous results on throughput evaluation of multimedia traffic support, we found that the two results are strongly correlated the fairer a protocol is, the better it is for supporting heterogeneous traffic under heavy network load.