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This study combines finite element (FE) modeling and digital signal processing (DSP) to predict the fatigue life of a ball grid array (BGA) package mounted on the print circuit board (PCB) under a random vibration loading. First, the board-level assembly was modeled using ABAQUS. Then the modal analysis and a following power spectrum analysis were performed to calculate the power spectral density...
Based on the field failure mechanisms in smart electrical energy meters, field operating abnormal data and maintenance data were analyzed. Discrimination analysis for field data was screened for predicting residual life. Through thoroughgoing analysis, field failure data, failure modes, failure mechanisms and external inducing stresses as well as their features with time were analyzed. Then the degradation...
Cloud computing is a new commercial model with distributed computing, utility computing, and grid computing. In many situations, both the cloud service providers (CSPs) and cloud service users maximize their earnings. Consequently, how to resolve the resource allocation and determine the transaction pricing between CSPs and users is a big challenge. In this paper, we propose a double auction-based...
Silver nanowires (AgNWs) transparent electrodes have attracted considerable attention owing to their high electrical and thermal conductivity, optical transparency, flexibility on many polymer substrates, and simple solution process. Many reports only focused on improving the performance of AgNWs electrodes while ignored the application lifetime considering that silver nanomaterials are susceptive...
Digital Television (DTV) spectrum located in VHF and UHF bands has excellent transmission and indoor penetration characteristics, and sensing the existence of signals of DTMB, i.e. the digital terrestrial multimedia broadcasting standard of China, becomes a key problem of the utilization of DTV spectrum resources in Cognitive Radio (CR) systems. A kind of weighted cooperative spectrum sensing method...
Digital Television (DTV) spectrum located in VHF and UHF bands has excellent transmission and indoor penetration characteristics, and sensing the existence of signals of DTMB, i.e. the digital terrestrial multimedia broadcasting standard of China, becomes a key problem of the utilization of DTV spectrum resources in Cognitive Radio (CR) systems. A kind of weighted cooperative spectrum sensing method...
Reliability is a critical metric in the design and development of scale-out data storage clusters. A general multiway replication-based declustering scheme has been widely used in enterprise large-scale storage systems to improve the I/O parallelism. Unfortunately, given an increasing number of node failures, how often a cluster starts losing data when being scaled-out is not well investigated. In...
ULSI circuits are constantly improved by continuous scaling down the character sizes. Copper connections and the ultralow-k (ULK) materials as inter-layer dielectrics (ILD) and inter-metal dielectrics (IMD) were implemented. Therefore, the chip package interaction (CPI) becomes critical due to the mechanical properties deteriorate of ULK with high porosity. The reliability of ULK layer may be affected...
ULSI circuits are constantly improved by continuous scaling down the character sizes. Copper connections and the ultralow-k (ULK) materials as inter-layer dielectrics (ILD) and inter-metal dielectrics (IMD) were implemented. Therefore, the chip package interaction (CPI) becomes critical due to the mechanical properties deteriorate of ULK with high porosity. The reliability of ULK layer may be affected...
With the rapid development of information technology, it is inevitable that the distributed mobile computing will evolve to pervasive computing gradually whose final goal is fusing the information space composed of computers with the physical space in which the people are working and living in. However, most of WSN contexts coming from may be more and more unstructed, widespread and massive. Therefore,...
In this paper, a motion control problem for underwater gilders in longitudinal plane is considered. A recurrent neural network based model predictive control approach is developed. The model predictive control of underwater gliders is formulated as a time-varying constrained quadratic programming problem, which is solved by using a recurrent neural network called the simplified dual network in real-time...
In this paper, we investigated the cooperative sensing in a heterogeneous cognitive radio (CR) network scenario, where each secondary user (SU) may be equipped with different number of receive antennas and have different signal processing capacity, e.g., sampling rate. By considering the discrepancy in sensing reliability of different SUs, we extended the existing researches to propose an optimal...
The micro solder joints serve as mechanical supporting and electrical connections in assembly of WLCSP devices on board-level. As the requirements of miniaturization, weight reduction in modern electronic devices, the dimension of solder joints is decreasing as small as 100um due to higher-density connections and smaller chip size. The integration of the solder joints is one of the key problems related...
Considering two payment schemes, this paper examines the impact of demand risk, supply risk and exchange rate risk on the optimal ordering policies of a loss-averse retailer that is served by two suppliers in the global supply chain environment. Using prospect theory, we formulate a decision model concerned with utility maximization. We prove the existence of equilibrium and derive the optimal ordering...
For a long time, power system reliability studies assume that the state transition functions should follow exponential distribution, but the preventive maintenance interval and repair time are typically non-exponential. Therefore, the assumption is bound to seriously affect the credibility of analysis results. For this reason, this paper proceeds from the fundamental theory of reliability in mathematics,...
As it is not suffered by the well-known noise uncertainty problem of energy detection (ED), generalized likelihood ratio test (GLRT) based spectrum sensing schemes for a single secondary user node have recently been extensively addressed. In this paper, we extend the existing research to an optimal GLRT based cooperative spectrum sensing scheme in a heterogeneous network scenario, where each node...
Through Silicon Via (TSV) has emerged as a good solution to provide high density interconnections in three-dimensional packaging interconnect technologies. However, the thermal-mechanical reliability is a big issue. When the TSV is subjected to thermal load, large stress and strain would be created at the interface of the materials because of the great mismatch of CTE. In this paper, an axi-symmetric...
With the rapid development of the information technology, it is inevitable that the distributed mobile computing will evolve to the pervasive computing gradually whose final goal is fusing the information space composed of computers with the physical space in which the people are working and living in. To achieve this goal, one of the problems is how to continuously monitor/capture and interpret the...
In modern replication storage systems where data carries two or more multiple copies, a primary group of disks is always up to service incoming requests while other disks are often spun down to sleep states to save energy during slack periods. However, since new writes cannot be immediately synchronized onto all disks, system reliability is degraded. This paper develops PERAID, a new high-performance,...
Higher packaging density is driven by the multifunctional requirements and size shrinkage in handheld applications, which was greatly improved by the 3D packaging technologies. Package-on-package (POP) is one of the 3D packaging solutions, in which components can be fully tested good prior to integration. However, the package warpage due to mismatch of materials properties is a greater challenge for...
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