关键词： Mobile edge computing   Mobile edge applications   Clouds   Resource allocation   Scheduling algorithm  

摘要： 5G networks are anticipated to provide service for vertical industries. Mobile Edge Computing (MEC) framework is a physical infrastructure improvement to host mobile applications for the introduction of new service provisioning in 5G networks. Application Orchestration is responsible for scheduling user sessions to application instances. In this paper, we propose four scheduling algorithms to assign sessions in a system with multiple MEC clouds. Results show that scheduling based on the occupancy level of MECs is quite robust in various scenarios and can be applied with the fractional guard channel policy to provide service.

关键词： SSD   客户端   固态硬盘   高性价比   产品组合   计算设备   移动计算   科技股  

摘要： 美光科技股份有限公司(美光)日前在其客户端计算产品组合中新增了一款高性价比固态硬盘(SSD)——美光1300 SSD,它的问世可让更多用户有机会使用快闪存储,通过其在个人计算设备中的广泛采用,提供更加卓越的移动计算体验。

关键词： caregiving   smartphones   children   child development  

摘要： Objectives: Mobile device use is a rapidly growing, socially acceptable interactional habit. The impact of mobile device use on social interactions, including between parents and young children, is uncertain. The aim was to describe, synthesise and evaluate the evidence about parents' mobile device use, caregiving and children's social and emotional development. Methods: Seven medical and social sciences databases were searched using keywords and subject headings. Screening for eligibility used PRISMA guidelines and scientific and reporting quality were assessed with standardised checklists. Results: Eight studies met the inclusion criteria (four surveys, three qualitative and one mixed-method investigation). This small group of studies is of diverse quality, but there is evidence of associations between parents' mobile device use, attention to caregiving and changes in child behaviour. Use of mobile devices during parenting activities may be infrequent and brief, but it can be a potent distraction that reduces caregiver responsiveness to children. Conclusions: An emerging body of research suggests mobile devices are associated with altered attention and responsivity to children by their caregivers and may change caregiver/child interactions. The evidence precludes questions about causality or discussion of impacts on child development. Knowledge gaps have been identified and they require future targeted research.

关键词： X ray photoelectron spectroscopy  

摘要： We systematically investigated the core-level X-ray photoelectron spectroscopy (XPS) binding energy shifts of B 1s and Al 2p and formation energies for defects including boron and aluminum in 3C-silicon carbide (SiC) by first-principles calculation. We analyzed the relation between the XPS binding energy shift and defect states and found that the defects with localized electrons in the band gap or energy gap in the valence band have larger XPS relaxation energies (XPSREs) than those without localized electrons. In contrast, spread electrons and electrons localized away from the core hole hardly affect the XPSREs. Further, we analyzed the dependence on crystal matrices, that is, elemental and compound semiconductors, on XPS spectra by comparing the XPS spectra of Si and 3C-SiC. Although the variation of the local potential in 3C-SiC is larger than that in Si, the variations of their relaxation energies are comparable. (C) 2019 The Japan Society of Applied Physics

关键词： Microsurgery   Education, medical, continuing   Teaching  

摘要： Mobile computing devices (MCDs), such as smartphones and tablets, are revolutionizing medical practice. These devices are almost universally available and offer a multitude of capabilities, including online features, streaming capabilities, high-quality cameras, and numerous applications. Within the surgical field, MCDs are increasingly being used for simulations. Microsurgery is an expanding field of surgery that presents unique challenges to both trainees and trainers. Simulation-based training and assessment in microsurgery currently play an integral role in the preparation of trainee surgeons in a safe and informative environment. MCDs address these challenges in a novel way by providing valuable adjuncts to microsurgical training, assessment, and clinical practice through low-cost, effective, and widely accessible solutions. Herein, we present a review of the capabilities, accessibility, and relevance of MCDs for technical skills acquisition, training, and clinical microsurgery practice, and consider the possibility of their wider use in the future of microsurgical training and education.

关键词： Cooperative task offloading   mobile edge computing   cloud computing   ADMM   wireless network  

摘要： The deployment of cloud and edge computing forms a three-tier mobile computing network, where each task can be processed locally, by the edge nodes, or by the remote cloud server. In this paper, we consider a cooperative three-tier computing network by leveraging the vertical cooperation among devices, edge nodes and cloud servers, as well as the horizontal cooperation between edge nodes. In this network, we jointly optimize the offloading decision and the computation resource allocation to minimize the average task duration subject to the limited battery capacity of devices. However, the formulated problem is a large-scale mixed integer non-linear optimization problem with the growing number of base stations and devices, which is NP-hard in general. To develop an efficient offloading scheme with low complexity, we conduct a series of reformulation based on reformulation linearization technology and further propose a parallel optimization framework by utilizing alternating direction method of multipliers (ADMM) method and difference of convex functions (D.C.) programming. The proposed scheme decomposes the large-scale problem into some smaller subproblems, which are done across the multiple computation units in a parallel fashion to speed up the computation process. Simulation results demonstrate that the proposed scheme can obtain a near-optimal performance with low complexity, and can reduce up to 24% of the task duration compared with other schemes. Simulation also shows how much the vertical and horizontal computation cooperations affect the system performance under different network parameters.

关键词： Design   Modeling   Thermomechanics   Stress   Heat pipes   Pressure  

摘要： The demands for both thinner bare-die ball grid array (BGA) packages and thinner thermal solutions have added complexity for the thermal enabling design and material options associated with system on chip packages in mobile personal computer (PC) platforms. The thermomechanical interactions between the bare-die package and the thermal solution are very critical, creating the needs for: (1) an in-depth thermomechanical characterization to understand their impacts on product quality and performance and (2) a simple and yet robust modeling methodology to analyze design parameters using a commercially available software. In this paper, experimental metrologies and modeling methodology are developed with the details of contents documented. Validation of the newly developed tools and recommendation/guidance are also discussed for detailed assessments of thermomechanical tradeoffs for optimal design spaces for next-generation mobile platforms.

摘要： Mobile computing is widespread and is influencing human performance and learning. Its use occurs in many different contexts. The question arises as to how the access and use of content via mobile interacts with the different contexts and how this affects human performance and learning. This article considers research from three disciplines to identify impacts and recommend approaches to the development of learning and performance supports.

关键词： 电池充电器   USB-C   移动计算系统   升降压   Combo   电子   笔记本电脑   株式会社  

摘要： 瑞萨电子株式会社推出升降压电池充电器,采用可反转USB Type-C连接器线缆,可用于笔记本电脑、超级本、平板电脑和移动电源的窄电压直流充电(NVDC)和混合功率升降压(HPBB)充电。ISL9241可通过固件控制NVDC与HPBB模式之间的切换,提供高效处理各种功率级别的低成本、小型充电解决方案。该器件利用瑞萨电子先进的R3调制技术实现卓越的轻载效率和超快的瞬态响应,并延长电池续航时间。该充电器可对内部寄存器进行重新配置,从而在HPBB模式下可采用更小的电感器,提高多个功率级别的效率。

关键词： Isotope shift   Mass shift   Normal mass shift   Specific mass shift   Field shift   Seltzer moment  

摘要： Spectral lines from different isotopes display a small separation in energy, commonly referred to as the line isotope shift. The program RIS4 (Relativistic Isotope Shift) calculates normal and specific mass shift parameters as well as field shift electronic factors from relativistic multiconfiguration Dirac-Hartree-Fock wave functions. These quantities, together with available nuclear data, determine isotope-dependent energy shifts. Using a reformulation of the field shift, it is possible to study, in a model-independent way, the atomic energy shifts arising from changes in nuclear charge distributions, e.g. deformations. (C) 2018 Published by Elsevier B.V.