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The study is about the interfacial intermetallic compounds (IMC) microscopic changes and nickel plating consumption on SAC305/Ni soldering joints (with four solder diameters: 200, 300, 400, 500µm) before and after isothermal aging at 160°C by scanning electron microscopy (SEM). The results indicated that the IMC are mainly the (Cu, Ni)6Sn5 of SAC305/Ni soldering joints after reflow. After aging, the...
Software systems continuously running over a long time may suffer gradual performance degradation or failure rate increasing. This phenomenon, known as ¡®Software Aging', has become a great challenge to dependability-critical software systems. Researchers have made remarkable achievements in predicting resource exhaustion time and designing optimal rejuvenation plan. However, limited works focus on...
In today's risk sensitive business environment, software has become the most valuable asset for organization. The success of any organization severely depends on the quality of their legacy systems so it is important to put more research effort in obtaining a better understanding of legacy system problems and their solutions. During the last several years, reengineering gained increasing interest...
This paper studies the aging amount of damnification and the cost of rejuvenation, in order to effectively reduce the average downtime costs of systems at the time of software aging existence, to increase the availability and reliability of system. For the reason that the resource are exhausted to result in attenuation of system performance and decline of processing capacity, this paper will study...
Owing to the limitation of traditional software aging trend prediction method that based on time and based on measurement in dealing with sudden large scale concurrent questions, this paper proposes a new software aging trend prediction method which is based on user intention. This method predicts the trend of software aging according to the quantity of user requests for each components during the...
Software aging refers to the phenomenon that long-running software shows signs of increasing failing rate, overmuch resource usage, and performance degradation. Software rejuvenation is a proactive approach to dealing with this problem. However, commonly used rejuvenation methods involve a relatively larger overhead. An alternative is to reduce the severity of software aging by online adjusting the...
Visible and near infrared spectroscopy (Vis/NIR) combined with chemometric methods was employed to classify rice wines with different ages. Spectra of 240 wine samples (80 for each year) were collected in the Vis/NIR region (325-1075nm) in the spectroradiometer in transmission mode. Partial least squares (PLS) analysis was applied to extract the principal components (PCs) as new eigenvectors to represent...
Distributed software systems are characterized by increasing autonomy. They often have the capability to sense the environment and react to it, discover the presence of other systems and take advantage of their services, adapt and re-configure themselves in accordance with the internal as well as the global state. Testing this kind of systems is challenging, and systematic and automated approaches...
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