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This paper presents the design, development, and evaluation of a high power, i.e., 1200-V/600-A, double-sided multichip phase-leg IGBT module with the purpose of increasing power density compared with conventional wire-bonded IGBT modules. Nanosilver paste is chosen as the die-attach material so as to increase the maximum application temperature by avoiding the creep failure at high temperatures compared...
Most existent studies of nanosilver paste, a promising package material, focused on a relatively small sintering area (< 100 m2). In this study, we were trying to bond 40 mm × 40 mm copper baseplate with 25 mm × 25 mm DBC using nanosilver paste in low temperature and pressure. Shear strength distribution and morphology was reported in this work. Through this process, the average shear strength...
Current “condition based maintenance decision making” of power transformers has not taken reliability and economy into consideration generally, which will cause large financial losses to electric enterprises. To solve this problem, a maintenance decision making model based on life cycle cost analysis was established to select the best maintenance strategy for transformers. After building the relationship...
To satisfy the stringent requirement of ocean monitoring in Marine Intelligent Transportation System, Marine Sensor Networks (MSNs) is envisioned as one of the most effective solutions. In this paper, we study the Heterogeneous and Double Paths MSNs (HDPM) architecture with Sensors (SNs) in view of the reliability of the networks. And we propose a generic integer linear programming (ILP) model to...
Microblog ranking is a hot research topic in recent years. Most of the related works apply TF-IDF metric for calculating content similarity while neglecting their semantic similarity. And most existing search engines which retrieve the microblog list by string matching the search keywords is not competent to provide a reliable list for users when dealing with polysemy and synonym. Besides, treating...
Nowadays TODIM (an acronym in Portuguese of interactive and multicriteria decision making) method has been widely used to solve multi-criteria decision making (MCDM) problems for its validity in consideration of psychological behavior of the decision maker (DM). However, the classical TODIM method can only deal with crisp numbers, which fails to respond to the vagueness of the information and hesitancy...
This paper studies the restoration of fragmented 2D digital pictures. Automatic reassembly of image fragments can facilitate many tasks in archaeology, forensics, and digital media. We propose an integrated algorithm for this important yet challenging problem. Our algorithm first determines the adjacency relationship among fragments, then effectively matches subpieces and refines the reassembly iteratively.
To have a full description of the fatigue behavior of nano-silver sintered lap shear joint, isothermal low cycle mechanical fatigue test was conducted in a systematic manner over a wide range of temperatures (25 to 325°C) with the shear strain amplitude set at different values. The low cycle fatigue behavior of the sintered lap shear joint was found to be strongly dependent on test temperature. To...
Network virtualization is viewed as a promising way for overcoming the ossification of the Internet. Virtual network mapping plays an important role in building virtual networks. The substrate network conditions change synchronously when the process of virtual network mapping, when a network failure happens, virtual network mapping without protection may lead to virtual network service interruption...
Based on the research on relevant standards of mine safety monitoring and early warning system and the analysis of typical disaster, the structure frame of typical disaster monitoring and early warning system was established, and the relationship between this system and digital mine system was made clear. This paper provides a basis for the popularization and application of non-coal mine typical disaster...
This study aims to study the relation between knowledge management and knowledge management performance, in Taiwan semiconductor industry, as well as organizational citizenship behavior being the moderator in the relation. Questionnaires were distributed to R&D personnel of public-listed companies in Taiwan semiconductor industry, and total 470 effective samples were retrieved. For data analysis,...
Low temperature sintered nano-silver paste becomes a potential alternative in green electrical packaging because of its higher thermal and electrical conductivity than conventional solders. It can be used for connected chips that require high temperature operation, such as high power LED and power electronics modules, etc. During service, alternating shear strain, even thermal fatigue failure will...
Heat dissipation for packaging high-power light-emitting diodes is critically important to performance and reliability of LED lighting modules. The first thermal interface encountered by the heat flow is a die-attach material between the diode chip and its substrate. In this study, three different types of die-attach materials were used to construct 1-Watt GaN LED single-chip modules: a silver epoxy...
To overcome the poor accuracy of fault line selection in small current grounded system, which induced by the reliability of symptom and the correlation symptom terms, a novel fault line selection method is proposed based on improved D-S evidence theory in the paper. Firstly, the fault line selection model is established based on traditional D-S evidence theory. Secondly, the effective measuring for...
Reliability evaluation can help to minimize costs and maximize reliability of wireless sensor networks (WSN). To evaluate the reliability of WSN, a mathematical model and an enhanced factoring (EF) algorithm are presented in this paper. Being different from traditional factoring algorithm, the node contraction is enhanced by source expansion and the isomorphic sub-networks are identified. These operations...
As communication networks play an important role in today's life, network reliability becomes more critical than ever. Traditionally, network reliability is measured by connectivity or traffic volume. However, most of performance degradation problems are correlated with routing dynamic and congestion. It is necessary to include the both routing dynamics and congestion into network reliability computation...
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