LogGAN: a Log-level Generative Adversarial Network for Anomaly Detection using Permutation Event Modeling

Information Systems Frontiers - System logs that trace system states and record valuable events comprise a significant component of any computer system in our daily life. Each log contains...     

3元◢n◣立方体网络的◢t/k◣可诊断度研究

可诊断度是评估多处理器系统可靠性的一个关键指标.t/k诊断策略通过允许至多k个无故障处理器被误诊为故障处理器,从而极大提高了系统的可诊断度.与t可诊断度和t1/t1可诊断度相比,t/k可诊断度可以更好地反映实际系统的故障模式.3元n立方是一种性质优良并且应用广泛的网络拓扑,在许多分布式多处理器的构建中被用做底层网络.根据一些引理以及确定系统为t/k可诊断的充分条件,研究得出当n≥3及0≤k≤n,3元n立方是tk,n/k-可诊断的,其中tk,n=2(k+1)n-(k+1)(k+2).这个结果显示,在选择恰当的k值时,3元n立方的t/k可诊断度tk,n远大于其t可诊断度2n和t1/t1可诊断度4n-3.     

基于半经典量子傅里叶变换的◢t◣-比特半经典相位估计算法实现

半经典量子傅里叶变换(quantum Fourier transform,QFT)是通过测量计算线路中特定的比特,依据测量结果经过经典信息处理控制下一个比特的变换.利用半经典量子傅里叶变换思想,提出了t-比特半经典量子相位估计算法,并在IBMQ Experience量子云平台、IBMqiskit量子模拟器和国内本源悟源云平台量子模拟器上开展了不同规模的半经典相位估计实验.实验表明,该方法提高了估计精度的同时减少了算法对线路规模和两比特受控门的依赖.     

Analytical investigation on thermal-induced warpage behavior of ultrathin chip-on-flex (UTCOF) assembly

The serious warpage issues of ultrathin chip-on-flex (UTCOF) assembly induced by mismatched thermal stresses have greatly affected the mechanical stability and reliability of emerging ultrathin chip packaging technology. Currently, a theoretical prediction as a convenient and straightforward approach is still lacked for describing effectively the thermal-mechanical behavior of UTCOF during the adhesive curing and cooling process. In consideration of the adhesive thickness approximating to ultrathin chip and flexible substrate thickness, we develop a layerwise-model of ultrathin chip-adhesive-flex structure under plain strain condition, where the behavior of thick adhesive bonding can be described precisely through increasing the subdivided mathematical plies. Further, the analytical results show that the concave and convex forms of ultrathin chip warpage yield at the end of the curing and cooling process respectively. Meanwhile, the effects of its structure dimensions and material properties are also revealed for discussing a way to relieve the extent of ultrathin chip warpage. Additionally, in order to verify the validity of the theoretical prediction, we also introduce the corresponding numerical technique and experimental method. These results suggest that a kind of rigid and ultrathin flexible substrate such as metal foil should be adopted for small warpage of ultrathin assembly.     

月球非军事化国际法问题探析

人类对月球的利用应致力于为全人类谋福利,提高人类的生活水平和促进经济、社会的进步和发展,一切以明确的军事目的所从事的探月行动都应该受到抑制与禁止。从月球非军事化的基本概念出发,探讨了国际法律文件对月球非军事化的规范作用,并提出了规制月球的探索利用行为,实现月球非军事化的国际法路径。     

Phase diagrams and thermodynamics of the systems ZrO2-CaO and ZrO2-MgO

The partial phase diagrams of the systems ZrO₂-CaO and ZrO₂-MgO were determined using precision lattice parameter measurements in order to check uncertainties reported in the literature. The results are in general agreement with the previous investigations by Hellmann and Stubican [83HeI], Grain [67Gra], and Sim and Stubican [87Sim]. Enthalpies of formation of the fluorite cubic solid solution and the Ca₂6Zr₁₉O₄₄ ordered phase, with reference to the monoclinic zirconia and the periclase forms of CaO and MgO, were measured calorimetrically. Assessment of the thermodynamic properties of these two systems shows that it is appropriate to model the systems with a simple single cation sublattice model. The eutectoid of the cubic phase in ZrO₂-CaO, according to both the optimization and the experimental results, is located at 1412 ± 50 K and 16.2 ±1.0 mol% CaO and in the ZrO₂-MgO binary at 1678 ± 5 K and 13.1 ± 0.5 mol% MgO. The calculated phase diagrams are presented for comparison with the experimental results.     

中国的稀有金属

本文简要介绍了中国稀有金属在研究、生产方面的发展概况。     

Using Memory in the Right Way to Accelerate Big Data Processing

Big data processing is becoming a standout part of data center computation. However, latest research has indicated that big data workloads cannot make full use of modern memory systems. We find that th...