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Drop test for solder joint reliability is critical for all area arrays and perimeter-leaded surface mount semiconductor devices typically used in handheld electronic products. Joint Electron Device Engineering Council, JEDEC, published a new test standard, JESD22-B111A, to be the revision of the JESD22-B111 for board level drop test in November, 2016. The major differences between JESD22-B111 and...
The paper presents a novel Telepower (−48V DC) reliability method, directly utilising site asset data in simulation software, to determine the effectiveness of battery replacement programs. Reliability is often estimated by a simple count of the number of outages per annum. This approach has many shortcomings because a count of outages can change dramatically even when the reliability of the physical...
Supporting diverse services under a unified system is a major concern for the realization in the fifth generation (5G) cellular networks. In 5G systems, the massive connection property of massive machine-type communications (mMTC) results in the huge demand of physical downlink control channel (PDCCH) resources. Furthermore, greater overhead of PDCCH is indispensable for ultra-reliable downlink transmission...
The complexity of the mechanism brings great difficulty to the calculation of the mechanism motion reliability, and the computer simulation algorithm based on Monte Carlo method needs a great number of simulation. The further-development of LMS Virtual. Lab was carried out, and the least square support vector machine algorithm was used to construct the response surface proxy model. The PSO-GA algorithm...
The Multi Arm Bandit (MAB) problem is a well-known decision making problem, where the gambler (operator), seeks the highest value and best choice among arms with different reward distributions. In recent years, many effective strategies have been proposed for the mentioned MAB problem. The strategy's procedure mainly includes attempts on acquiring a better exploitation and efficiency, while also maximizing...
We present two geometric routing algorithms that reliably deliver messages to all devices in a geocast region. One algorithm is based on flooding, the other on concurrent geometric routing. They are the fist known stateless geocasting algorithms. We formally prove the algorithms correct, evaluate their performance through abstract and concrete simulation and estimate their message complexity.
Recently introduced Bi-directional Z-Source breakers [1] are capable of clearing the short circuit fault within a few microseconds. In this paper, various applications and protection requirements for Bidirectional Z-Source breakers are discussed. Detailed comparison between de-rated AC breakers and Z-Source breakers is discussed. Breaker design criteria are explained with the help of simulation results...
Wireless Token Passing Networks (WTPN) have gained significant attention in the recent times due to the ability of these networks to overcome the challenge of channel access sharing faced by the wireless networks supporting real-time communications. A WTPN is specified as the network implementing token passing techniques in order to share the wireless channel access medium. In the token passing techniques,...
Defect of SAC305 large-size BGA components attached with SnPb solder was analyzed by metallographic examination, and the faulty welded joint was found at the center position of the component. In order to explain the failure mode, reflow process simulation on assembled PCB board was carried out by ANSYS, and the temperature distribution was deeply studied. It is shown that there a obvious difference...
The problem of dependability assessment can be solved analytically just under predefined conditions. If they do not hold, alternative approaches must apply. Widely, they rely on the Monte Carlo simulation, suffering by the high computational complexity. Some rest on further instruments such as probabilistic timed automata that have been shown to be efficient to solve problems in various areas. However,...
A new multi-feature fusion method is proposed for the radar target recognition based on D-S evidence iterative discount method. Firstly, the discount factor is defined based on the multi-feature confusion matrix and basic probability assignment (BPA) function. Then, when the conflict is high, the evidence is discounted using the discount factor, and basic probability assignment function, discount...
In this paper, a new and simple method named Weibull criterion is proposed to identify whether metastable states occur in single random telegraph noise (RTN), which has been verified by both simulation and experiment results. It is helpful for comprehensive understanding of trap properties and providing a direct evidence of oxide traps with multiple states.
PHM (Prognostics and Health Management) is an engineering technology focusing on failure prognostics and so it has critical effects on the performance of the task system. In this paper, the qualitative analysis method of FMEA (Failure Mode and Effects Analysis) is proposed to analyze the prognostics' performance of PHM system and five corresponding evaluation parameters are derived. Based on some...
A sequential preventive maintenance (PM) simulation model is established for the system with the life distribution of degradation, assuming that corrective maintenance (CM) during the preventive maintenance interval is considered as minimal maintenance and preventive maintenance is imperfect maintenance. And the preventive maintenance effect is described by age reduction factor. According to the availability...
Phased-mission system (PMS) can have a number of mission phases with different system configurations of components. In engineering practice, there exist PMSs that have phases with time redundancy, meaning that the system is required to work in operational state for only a given duration of time within such phase, instead of all the phase duration like traditional PMS. For such complex PMS, it is not...
A bipolar dc microgrid features three voltage levels and is capable of transmitting power more efficiently than a unipolar system. This paper proposes a droop control to achieve load sharing and voltage balancing in such a microgrid system. Droop control is adopted to ensure that autonomous sharing of load power can be realized without communication. Moreover, the positive and negative pole voltages...
In order to address the economical dispatch problem in islanding microgrids, this paper proposes a criterion and a decentralized economical-sharing scheme. The criterion is to judge the optimal economical-sharing whether can be realized via the decentralized approach. Then an optimal decentralized economical-sharing scheme is proposed. This overcomes the limitations of traditional centralized control,...
In this paper, the two Negative Bias Temperature Instability (NBTI) framework components are divided with interface trap generation (Δ Vit) and hole trapping in pre-existing defects (Δ Vht). The threshold voltage shift (ΔVT) contribution is verified by two divided components and studied independently. The impact of inter layer (IL) thickness is simulated under NBTI stress using technology computer-aided...
In this paper, we propose a method to improve localization algorithm of maximum likelihood estimation; the localization scheme relies on the distance threshold. In order to suppress effectively the effects of received signal strength error to node localization precision. This paper presents an indoor localization algorithm based on received signal strength to select anchor nodes. Compared with the...
For the first time, an integrated thermal characterization scheme that generates a full two-dimensional temperature map of GaN lateral devices has been developed. Through calibration and integration of micro-Raman thermometry, thermoreflectance thermal imaging, and infrared thermography, the accuracy of these techniques has been demonstrated to significantly improve, in addition to the complete thermal...
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