Robust measurement of individual localized changes to the aging hippocampus

Alzheimer’s Disease (AD) is characterized by a stereotypical spatial pattern of hippocampus (HP) atrophy over time, but reliable and precise measurement of localized longitudinal change to individual HP in AD have been elusive. We present a method for quantifying subject-specific spatial patterns of longitudinal HP change that aligns serial HP surface pairs together, cuts slices off the ends of the HP that were not shared in the two delineations being aligned, estimates weighted correspondences between baseline and follow-up HP, and finds a concise set of localized spatial change patterns that explains HP changes while down-weighting HP surface points whose estimated changes are biologically implausible. We tested our method on a synthetic HP change dataset as well as a set of 320 real elderly HP measured at 1-year intervals. Our results suggests that the proposed steps reduce the amount of implausible HP changes indicated among individual HP, increase the strength of association between HP change and cognitive function related to AD, and enhance the estimation of reliable spatially-localized HP change patterns.     

基于协同服务器组的志愿者计算环境的构造

构造了一个基于协同服务器组的志愿者计算环境P2HP.P2HP把平台中的所有节点按照角色划分为监控服务器节点、调度服务器节点、计算节点和数据服务器,进而形成一个可扩展的层次网络拓扑架构.P2HP具有开放性、容易使用、容错能力好、可扩展、跨平台等特点,并提供一套简单方便的API(application programming interface)函数调用来支持并行应用程序开发.测试结果表明,P2HP是处理高性能并行应用的一个可行的方法.     

再磨过程泵池液位区间与给矿压力模糊切换控制

赤铁矿再磨过程泵池液位受到大的随机干扰的影响, 造成泵池液位波动大, 采用已有的再磨过程泵池液位定值闭环控制方法, 必然会造成矿浆泵转速在大范围内频繁变化, 从而使给矿压力频繁波动在工艺规定的范围之外, 降低了旋流器的分级效率. 本文提出了由泵池液位区间控制和给矿压力回路控制组成的模糊切换控制方法, 泵池液位区间控制通过对给矿压力设定值保持器和模糊补偿器的切换, 将给矿压力设定值控制在所允许的波动范围内; 通过给矿压力PI回路控制器跟踪其设定值, 从而将泵池液位控制在目标值范围内, 并将给矿压力的波动控制在允许的范围内. 在国内某大型赤铁矿选矿厂的成功应用, 表明采用该方法有效减少了泵池液位和给矿压力的波动, 使得再磨过程安全运行, 提高了旋流器分级效率.     

Comparative Analysis of Different Evaluation Functions for Protein Structure Prediction Under the HP Model

The HP model for protein structure prediction abstracts the fact that hydrophobicity is a dominant force in the protein folding process.This challenging combinatorial optimization problem has been widely addressed through metaheuristics.The evaluation function is a key component for the success of metaheuristics;the poor discrimination of the conventional evaluation function of the HP model has motivated the proposal of alternative formulations for this component. This comparative analysis inquires into the effectiveness of seven different evaluation functions for the HP model.The degree of discrimination provided by each of the studied functions, their capability to preserve a rank ordering among potential solutions which is consistent with the original objective of the HP model, as well as their effect on the performance of local search methods are analyzed.The obtained results indicate that studying alternative evaluation schemes for the HP model represents a highly valuable direction which merits more attention.     

Inverting the Hodrick–Prescott Filter

The Hodrick–Prescott (HP) filter is the most popular method oftransforming data in the Real Business Cycle (RBC) literature. An algorithmto invert the Hodrick–Prescott (HP) filter is described. This algorithmis applied, using Markov chain Monte Carlo methods, to the problem ofevaluating a simple RBC model. The problem of determining the optimalsmoothing parameter for the HP filter is also studied.     

HD9195AB扫描仪在中文Windows下的安装使用

介绍了Hp ScanJet Plus(ISA接口卡）扫描仪在中文WINDOWS3X和中文WEINDOWS9X下的安装及使用方法,使该闲置诗报废的Hp ScanJet plus(HP9195AB)扫描仪重新发挥应有的作用。     

Expanded HP memristor model and simulation in STDP learning

Based on the classical HP memristor found by HP Lab, this paper presents an expanded model that making fully consideration of the influence of R _on, that is, R _on is the similar order of magnitude of R _off. Simulations proved that in some particular conditions, the hysteresis effect of the expanded model is the same as HP memristor. A comparison was made between these two models under some given conditions. Then, we built several simulations to test the classical characteristics of the expanded HP memristor. Simulation results demonstrate that the expanded model is superior to the original in some aspects like easy switching and power saving. At last, we applied the expanded HP memristor in STDP learning simulation, which shows it is a good candidate for neural network when a threshold voltage function is proposed.     

High‐speed Marching Cubes using HistoPyramids

We present an implementation approach for Marching Cubes (MC) on graphics hardware for OpenGL 2.0 or comparable graphics APIs. It currently outperforms all other known graphics processing units (GPU)‐based iso‐surface extraction algorithms in direct rendering for sparse or large volumes, even those using the recently introduced geometry shader (GS) capabilites. To achieve this, we outfit the Histogram Pyramid (HP) algorithm, previously only used in GPU data compaction, with the capability for arbitrary data expansion. After reformulation of MC as a data compaction and expansion process, the HP algorithm becomes the core of a highly efficient and interactive MC implementation. For graphics hardware lacking GSs, such as mobile GPUs, the concept of HP data expansion is easily generalized, opening new application domains in mobile visual computing. Further, to serve recent developments, we present how the HP can be implemented in the parallel programming language CUDA (compute unified device architecture), by using a novel 1D chunk/layer construction.     

IC－CAD框架环境系统ICSDE／HP的数据管理模型

本文介绍了一种支持ＩＣ－ＣＡＤ软件工具开发及系统集成的集成化框架环境ＩＣＳＤＥ／ＨＰ系统的数据管理方式。通过对数据管理系统的描述，讨论了ＩＣＳＤＥ／ＨＰ系统中数据存放库的模型、库中数据存放的方式、数据的版本控制、数据的存取权限、数据的回溯及多用户设计中并行数据的管理。     

基于IEEE488接口卡的虚拟频谱仪系统的构建

介绍了基于ＩＥＥＥ４８８接口卡的虚拟频谱仪系统。该系统由带有ＨＰ－ＩＢ接口卡的计算机、ＨＰ８５９２Ｂ型频谱分析仪以及ＨＰ－ＩＢ总线构成。分析和讨论了该系统的硬件构成、基本工作原理、软件编程和在保遇到的一些问题及解决方案。     

Temporal aggregation, systematic sampling, and the Hodrick-Prescott filter

The time aggregation properties of the Hodrick-Prescott (HP) filter, which decomposes a time series into trend and cycle, are analyzed for the case of annual, quarterly, and monthly data. Aggregation of the disaggregate components cannot be obtained as the exact result from direct application of an HP filter to the aggregate series. Employing several criteria, HP decompositions for different levels of aggregation that provide similar results can be found. The aggregation is guided by the principle that the period associated with the frequency for which the filter gain is should not be altered. This criterion is intuitive and easy to apply. It is shown that it is approximated, to the first order, by an already proposed empirical rule and that alternative, more complex criteria yield similar results. Moreover, the values of the smoothing parameter of the HP filter that provide results which are approximately consistent under aggregation are considerably robust with respect to the ARIMA model of the series. Aggregation is found to perform better for the case of temporal aggregation than for systematic sampling. The desirability of exact aggregation consistency is investigated. A clarification concerning the supposed spuriousness of the cycles obtained by the HP filter is discussed.     

Broadband dual‐polarized omnidirectional antenna with simple feeding structure

This paper presents a broadband dual‐polarized omnidirectional antenna with a simple feeding structure. It consists of a monopolar patch element for vertically linear polarization (VP) and a circular printed‐dipole array for horizontally linear polarization (HP). The monopolar patch antenna is loaded with shorting vias and coupled ring in order to broaden the VP bandwidth, nevertheless keeping a low profile. The printed dipoles with integrated balun are arranged on a circular substrate and incorporated with a 1‐to‐4 power divider for achieving the broadband HP omnidirectional radiation. One of the key features is to replace a shorting‐via in the monopolar patch by the coaxial line of the HP element, allowing a simple configuration and not affecting the VP radiation. The final design with a profile of 0.28λ_min has been fabricated and measured. The measurements result in an overlapped impedance bandwidth of 25.4% (2.2‐2.84 GHz) and port‐to‐port isolation of >33 dB. Also, the antenna achieves the peak gain values of 8.0 and 5.6 dBi for the VP and HP radiations, respectively.     

HP VEE与自动测试技术

本文结合现代测试自动化的要求,重点讨论了HP VEE及其进行自动测试的软硬件关键技术,并在此基础上给出了基于HP VEE自动测试的实例。     

HP服务器在全业网络中的应用

根据企业对服务器的各种要求，从ＨＰ服务器的结构设计、可靠性、良好的可管理性和完善的培训机制等角度出发，介绍了ＨＰ服务器在中小企业的解决方案。     

二元溴化物系(MBr-M′Br_2)中间化合物形成规律的逐级投影法研究

提出了一种新的模式识别建模方法-逐级投影法(hierarchical projection method),并将该方法用于二元溴化物系(MBr-M’Br_2)中间化合物形成规律的研究。在由原子键参数(z/r)_M、X_M'、I_M、I_M',张成的多维空间中,能形成和不能形成MBr-M'Br_2系中间化合物的样本点分布在不同的区域。利用HP方法得到的超多面体模型可描述MBr-M'Br_2系中间化合物在多维空间中分布区域的边界,在此基础上预报RbBr-CaBr_2和CsBr-CaBr_2这2个熔盐体系可形成中间化合物,结果得到实验证实。     

Interview with Alan Ganek and Mark Potts

Trend Wars host, Dejan Milojicic, recently discussed service management with Alan Ganek, the chief technology officer (CTO) of IBM Tivoli, and Mark Potts, Hewlett-Packard (HP) Fellow and chief technologist of HP Software.     

应用开源OpenNMS实现网络监控和报警

本文主要介绍湖南省疾控中心利用开源的企业级网络管理平台OpenNMS实现对数据中心的网络设备、服务器、应用实时监控.特别是在经费有限,并且还缺少短信网关、私有邮件服务器的情况下,以最少代价实现及时发现网络瓶颈和故障报警.HP Data Protector （以下简称DP）是惠普公司提供的一款备份软件,本文同时也介绍了HP DP的报告和报警功能的使用,并且以HP DP报警为例演示OpenNMS邮件报警功能.     

New Products

Hewlett-Packard's Model 64005S emulation terminal system lets mainframe users augment existing microprocessor product development tools for their computers with the real-tine, transparent emulation of the HP 64000 logic development system. With RS-232C (V. 24) or current loop interfaces for serial data links to the computer, the HP 64100A development station can be used as an ASCII terminal or as a stand-alone emulation station. Logic analysis is optionally available.     

Exact enumeration of three-dimensional lattice proteins

We present an algorithm for the exhaustive enumeration of all monomer sequences and conformations of short lattice proteins as described by the hydrophobic-polar (HP) model. The algorithm is used for an exact identification of all designing sequences of HP proteins consisting of up to 19 monomers whose conformations are represented by interacting self-avoiding walks on the simple cubic lattice. Employing a parallelized implementation on a Linux cluster, we generate the complete set of contact maps of such walks.     

A local landscape mapping method for protein structure prediction in the HP model

The hydrophobic-polar (HP) model has been widely studied in the field of protein structure prediction both for theoretical purposes and as a benchmark for new optimization strategies. In this work we present results of the recently proposed Hybrid Monte Carlo Ant Colony Optimization heuristic in the HP model using a fragment assembly-like strategy. Moreover we extend that method introducing a general framework for optimization in the HP model, called Local Landscape Mapping, and we test it using the pull moves set to generate solutions. We describe the heuristic and compare results obtained on well known HP instances in the 3-dimensional cubic lattice to those obtained with standard Ant Colony optimization and Simulated Annealing. Fragment assembly-like tests were performed using a modified objective function to prevent the creation of overlapping walks. Results show that our method performs better than the other heuristics in all benchmark instances when the fragment assembly-like strategy is used while in the case of pull moves-based neighborhood its performance is comparable to that of simulated annealing.