ABE: an environment for engineering intelligent systems

The ABE multilevel architecture for developing intelligent systems addresses the key problems of intelligent systems engineering: large-scale applications and the reuse and integration of software components. ABE defines a virtual machine for module-oriented programming and a cooperative operating system that provides access to the capabilities of that virtual machine. On top of the virtual machine, ABE provides a number of system design and development frameworks, which embody such programming metaphors as control flow, blackboards, and dataflow. These frameworks support the construction of capabilities, including knowledge processing tools, which span a range from primitive modules to skeletal systems. Finally, applications can be built on skeletal systems. In addition, ABE supports the importation of existing software, including both conventional and knowledge processing tools     

Monolithic integration of a GaInAs p-i-n photodiode and an opticalwaveguide: modeling and realization using chloride vapor phase epitaxy

A theoretical and experimental study is discussed of a p-i-n GaInAs photodiode integrated with inverted-rib InP or GaInAsP waveguides grown on InP substrate. The coupling efficiency between the waveguide and the photodiode is calculated using the beam-propagation method while the initial condition, i.e. the waveguide eigenmode, is calculated by the finite-difference method. The photodiode absorption is calculated as a function of key design parameters, which are the waveguide dimensions, the wavelength and, in the case of heterostructure waveguide, the composition of the quaternary layer. Two classes of device application are foreseen: monitor photodiode and end line receiver     

Aufnahme der Fließkurven dünner Bleche im ebenen Torsionsversuch

Prinzip des ebenen Torsionsversuches. Konstruktion einer Versuchseinrichtung. Anwendungsgrenzen. Versuchsauswertung. Erste Versuchsergebnisse. Experimenteller Nachweis, daß die Fließkurve bis zu weit höheren Umformgraden bestimmt werden kann als im Flachzugversuch.     

Prüfung des plastischen Verhaltens metallischer Werkstoffe in Torsionsversuchen

Testing the Plastic Behaviour of Metallic Materials by Torsion Tests The torsion test on cylindrical bars (bulk material) and the plane torsion test on thin sheet which has been developed recently are described and discussed with respect to their communities and their differences. In the torsion test on cylindrical bars the experimental data are conventionally used for calculating shear stress and shear strain for the specimen surface. However, the material properties are strongly distorted at the surface; therefore it is recommended to calculate shear stress and shear strain for a ?critical radius”? for which shear stress is only weakly depend on the properties of the estimated shape of flow curve. It is shwon that for this critical radius, stress and strain are almost independent of the notch effect caused by the shape of specimen. For the plane torsion test on thin sheet a “critical radius” is defined by the condition that shear strain is only weakly dependent on the properties of the estimated shape of flow curve. The calculation of stress and strain for the “critical radius” seems to result in a loss of information. However, the flow curve obtained this way is more reliable than that one obtained by the conventional method.     

Collective deformations in proteins determined by a mode analysis of molecular dynamics trajectories

A systematic method of representing and analyzing the intramolecular strains in proteins is proposed. For illustrative purposes, the method is applied to the N-terminal fragment of the human T-cell glycoprotein CD4. The method is based on the singular value decomposition (SVD) of molecular dynamics (MD) trajectories. The slowest three modes of motion that carry information along the protein molecule over large length scales are analyzed, so as to characterize the collective motions and the resulting strains along the three principal axes of the protein. Strong cooperative motions of different types, mainly wave-like, wagging, wiggling, breathing, bending and shearing motions, and rigid body rotations are distinguished. The mean-square fluctuations of C^α-atoms induced by the three dominant modes are found to exhibit a closer correlation with the experimental temperature factors in the presence of solvent.     

Monolithic class IV type flextensional transducers

In this study new type piezoelectric monolithitic low cost underwater and biomedical transducers based on Class IV flextensional transducer design has been introduced. Transducers were produced by using two techniques: fused deposition and extrusion. Besides, finite element analysis (FEA) was used extensively in order to optimize transducer design to achieve broad bandwidth for both transmitting and receiving and engineered vibration modes. Class IV transducers possess resonance frequencies in the range of above 30 kHz to below 150 kHz. Symmetry and design of the transducer, poling patterns, driving and receiving electrode geometries and driving conditions have strong effect on the vibration modes, resonance frequencies.     

Porous activated carbon monolith with nanosheet/nanofiber structure derived from the green stem of cassava for supercapacitor application

Carbonization and activation have been exploited as an economic and efficient approach toward the production of porous activated carbon monolith derived from green stem of cassava (GSC). In addition, ZnCl₂ was used as a chemical activator agent at various concentrations, therefore serving as a key factor in the development of porous carbon. The carbonization process (N₂) was integrated with physical activation (CO₂), and then N₂ sorption, scanning electron microscopy, X-ray diffraction, energy dispersive X-ray were examined to evaluate the specific surface area, pore structure characteristic, morphology structure, crystallinity, and the surface element, respectively. Furthermore, cyclic voltammetry was used to measure the electrochemical performance, through a two-electrode system in 1M H₂SO₄. Therefore, the synthesized porous activated carbon exhibits a micropores-mesopores combination, and the optimized sample demonstrated nanosheet and nanofiber structures. The results show a high electrochemical behavior in 1M H₂SO₄ electrolytes, by the electrodes, with specific capacitance, energy, and power densities of 164.58 F g⁻¹, 22.86 Wh kg⁻¹, and 82.38 W kg⁻¹, respectively. This route confirms the opportunity of using novel GSC in the production of porous carbon monolith with nanosheet/nanofiber structure for supercapacitor applications.     

Monitoring of count data time series: Cumulative sum change detection in Poisson integer valued GARCH models

This article presents a cumulative sum (CUSUM) monitoring approach for count-data time series. A seasonal integer-valued generalized autoregressive conditional heteroscedasticity (INGARCH(1,1)) time series model with Poisson deviates is used to develop a likelihood ratio test formulation to detect changes in the process accounting for temporal correlations and seasonality. Simulation studies show that the proposed CUSUM monitoring approach can provide significantly improved performance in applications where serial correlation or seasonality is prevalent. A case study with real traffic crash counts is presented to illustrate the application of the proposed methodology for roadway safety improvement.     

装备研制进度关键路径的Monte Carlo 模拟与分析

针对武器装备研制进度管理中无法对工期进行有效管理的问题,提出一种将Monte Carlo运用到PERT网络中以确定关键路径的方法。在经典计划评审技术基础上,给出网络图中工序的关键度、关键路径的定义,通过Monte Carlo法模拟仿真计算得到各工序关键度的大小,依据关键度大小确定网络的关键路径,并成功地将该方法运用到某自主防空作战平台运载器分系统PERT网络图分析中。仿真结果表明：该方法有效地解决了网络中工序持续时间随机性较大的问题,为确定关键技术及分析关键技术对研制进度的影响提供了一种有效的方法。