智能网SCP的两级软件容错策略研究

指出了目前ＳＣＰ在实现方面存在的缺陷，针对其结构和运行机制，提出其软件具有系统级与呼叫级的两级并发性，并基于这个两级并发模型对它的软件容错途径进行了深入的探讨与研究。首次提出了应用软件出错情况下保证所有在线呼叫可靠处理的容错目标，并在ＳＣＰ系统级与呼叫级两个并发层次上给出了切实有效的容错策略或算法。最后对ＳＣＰ软件系统有效度的估算进行了进一步讨论。     

Cellulolytic properties of Chaetomium crispatum

The cellulolytic properties of a Chaetomium crispatum strain were investigated. The cellulolytic enzyme complex i.e.: exo-1,4-β-glucosidase (EC 3.2.1.74); endo-1,4-β-glucanase (EC 3.2.1.4.) and β-glucosidase or cellobiase (EC 3.2.1.21) displayed optimal activity at pH 5.0 and 25°C. Although carboxymethyl-celluloses are the usual pseudo-substrates for this enzyme complex, those with a high degree of substitution gave rise to poor growth and low cellulase activity. Insoluble crude cellulosics such as newsprint, recycled paper, rice and flax straw were substantially solubilised at 28°C within 3–5 days of fermentation. A study of the cellulase-complex formation during the growth cycle revealed that β-glucosidase was produced mainly intracellularly in the early exponential phase, while the overall exo-1,4-β-glucosidase and endo-1,4-β-glucanase formation gradually increased during the total fermentation cycle. The mycelial protein of Chaetomium crispatum grown on crude cellulosics displayed a favourable amino acid pattern, indicating its potential value as a source of single cell protein (SCP).     

“开机提醒”业务两种主要实现方式及比较

本文对开机提醒业务SCP及信令采集两种主要实现方式进行了深入介绍,并对其实现方式的优缺点进行了全面的比较。     

Preparation and characterization of blend membranes of polyurethane and superfine chitosan powder

A novel kind of asymmetric blend membranes with superfine chitosan powder (SCP) and biomedical polyurethane was prepared by immersion precipitation phase inversion method. Effects of different SCP content on the morphology and properties of the blend membranes were investigated. The result showed that SCP content had little influence on the cross-section structure of the blend membranes, and the cross-section presented a cellular structure. WAXD results revealed that the aggregated structure of SCP remained. With an increment of SCP content, the pore diameter and porosities of blend membranes increased firstly, and then decreased. While, the water absorption rate and water vapor transmission rate were improved remarkably with increasing SCP content. The mechanical testing results indicated that with an increment of SCP ratio, mechanical properties presented a descending trend, whereas all blend membranes exhibited the good elasticity.     

棉秆稀酸水解及微生物共发酵生产单细胞蛋白工艺优化研究

通过正交试验确定稀酸水解棉秆的最优工艺,以纤维素含量最高,木质素含量最少为优选标准,得到优化工艺条件为:硫酸体积分数1.0%、固液比1:15,于100℃条件下水解2.0h,以此发酵工艺获得稀酸水解棉杆用于后续发酵工艺研究中。采用Plackett-Burman设计法,从酵母菌接种量、酵母菌接种时间、青霉接种量、共发酵时间、起始pH值、含水量、温度、麸皮含量和装料量9个因素中筛选出装料量、麸皮含量、共发酵时间、青霉接种量4个主要影响因素,并通过响应面分析法对工艺条件进行优化,获得的最优工艺条件为:青霉接种量10%、麸皮含量4%、装料量为发酵罐头瓶体积(250mL)的1/3、共发酵时间53h,在此基础上进行验证实验,得到单细胞蛋白含量的平均值为25.38%,与模型的理论预测值(22.79%)仅相差2.59%,说明建立的模型是切实可行的。     

Variance-Constrained Filtering Fusion for Nonlinear Cyber-Physical Systems With the Denial-of-Service Attacks and Stochastic Communication Protocol

In this paper, a new filtering fusion problem is studied for nonlinear cyber-physical systems under error-variance constraints and denial-of-service attacks. To prevent data collision and reduce communication cost, the stochastic communication protocol is adopted in the sensor-to-filter channels to regulate the transmission order of sensors. Each sensor is allowed to enter the network according to the transmission priority decided by a set of independent and identically-distributed random variables. From the defenders’ view, the occurrence of the denial-of-service attack is governed by the randomly Bernoulli-distributed sequence. At the local filtering stage, a set of variance-constrained local filters are designed where the upper bounds (on the filtering error covariances) are first acquired and later minimized by appropriately designing filter parameters. At the fusion stage, all local estimates and error covariances are combined to develop a variance-constrained fusion estimator under the federated fusion rule. Furthermore, the performance of the fusion estimator is examined by studying the boundedness of the fused error covariance. A simulation example is finally presented to demonstrate the effectiveness of the proposed fusion estimator.      

5G信令网SCP引入策略及部署建议分析

信令网是移动通信的神经网络,随着5G网络部署网元规模的增加,现有网元通信模式出现局限性。通过分析SCP引入必要性及组网模式,结合现网特点从业务需求、与周边网元对接、运维管理、网络演进等因素,给出初期组网模式、节点设置和网络架构建议。     

基于PDM协同设计任务建模与调度方法研究

从产品数据管理系统中协同设计过程任务建模的角度出发,提出基于产品结构分解的协同设计过程人员-任务分配模型,建立任务结构的约束映射和基于可扩展着色Petri网的任务过程建模方法,实现Multi-agent协同设计过程任务调度集成框架,最后进行了系统实现.     

A Novel Sparse Penalty for Singular Value Decomposition

Singular value decomposition (SVD) is a tool widely used in data denoising, matrix approximation, recommendation system, text mining and computer vision. A m a jority of applications prefer sparse singular vectors to capture inherent structures and patterns of the input data so that the results are interpretable. We present a novel penalty for SVD to achieve sparsity. Comparing with the traditional penalties, the proposed penalty is scale, dimen-sional insensitive and bounded between 0 and 1, which are in favor of controlling sparsity. Regulated by the penalty, we provide an efficient algorithm to pro ject a vector onto a given sparse level in O(n) expected time. The efficient pro jection algorithm serve as a drudge for sparse SVD (SSVD). In experiments, SSVD is efficient and could cap-ture the latent structures and patterns of the input data.     

Submerged yeast fermentation of acid cheese whey for protein production and pollution potential reduction

Bench-scale batch bioreactors were used to study the effectiveness of cheese whey fermentation for single-cell protein production using the yeast Kluyveromyces fragilis in reducing the pollution potential of whey as measured by solids, chemical oxygen demand (COD) and nitrogenous compounds concentrations. The four principal phases (lag, exponential, stationary and death) encountered in the history of a microbial culture grown under batch conditions were clearly recognized in the growth, temperature and dissolved oxygen curves. The lactose concentration and soluble COD displayed three distinct phases corresponding to the lag, exponential and stationary phases of the yeast growth. The minimum dissolved oxygen and maximum temperature observed in this study (at an air flow of 3 VVM, a mixing speed of 400 rpm and an ambient temperature) were 2.49 mg/L and 31.6 degrees C, respectively. About 99% of lactose (90.6% of soluble COD) was utilized after 28 h. The total COD continued to decline due to cell death resulting in a reduction of 42.98%. The total nitrogen concentration remained unchanged while the organic nitrogen increased during the exponential phase and then declined during the death phase. The ash content remained unchanged while a substantial reduction (56%) of the volatile solids was observed. These results indicated that sufficient oxygen for yeast growth was present in the medium and no cooling system was needed for this type of fermenter under similar experimental conditions. Recovering the yeast biomass with ultrafiltration reduced the total COD by 98% of its initial value in the raw whey.