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In the current study, the size effect of Sn3.0Ag0.5Cu solder joints on intermetallic growth is investigated. Experiments were performed to solder joints with a diameter of 2 mm and the solder thickness ranges from 2 mm to 50 µm. The thickness of intermetallic compound (IMC) of solder joints with different thickness as reflowed are found to be dependent on the size of solder joints. The IMC of small...
For patients with hemiplegia or stroke and other limb locomotion dysfunction due to problems such as neurological, an important therapy is Rehabilitation training. Repetitively task-directed exercise can increase the motion performance of patients with nerve problems. In this paper, an adaptive controller for the lower limb rehabilitation robot (LERR) is proposed to take control of the robot's gait...
Medical X-ray machine provides a powerful technical support and guarantee for accurate diagnosis of certain human diseases in modern disease diagnosis. However, clinical application investigation shows that the X-ray source of medical X-ray machine has some defects such as low efficiency, high energy consumption, poor quality of imaging, bad control stability, lower repeat rate, which makes the X-ray...
Trust-management subjects face the problem of discovering credential chain. In this paper, the distributed credential chain discovery algorithms in trust-management with parameterized roles are proposed. The algorithms extend the RT0’s and are goal-oriented also. Based on the concept of parameterized roles in RT1, they search the credential graph via the constant matching and variable solving mechanisms...
A light-PKI Fast Authentication Model is proposed to improve the speed of communications authentication. In the light-PKI model, the root public key, CRL and canceled certificate are stored safely in terminal. It dose not need the TTP when two terminals authenticate each other. So, this model can enhance the authentication speed of PKI systems.
In 3G mobile communication system, mobile broadband data services create great opportunities on revenue growth for network carriers. In the mean time, the dramatically increased subscribers make the access and core network more and more over-loaded everyday. Unfortunately, majority of wireless bandwidth is consumed by non revenue driven application traffic such as the P2P downloading, illegal VoIP...
It proposes a fair e-cash payment model on credit outdrawing, which can avoid the odd change and division of e-cash, users, according to the bill of credit issued by the bank, get the e-cash to pay their consumption to sellers after verification by the sellers without the participation of bank at each time. The role of banks is to solve the disputes between the users and sellers to ensure the fairness...
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