Change-Point Analysis: Elision in Euripides' Orestes

This paper studies the problem of detecting multiplechanges at unknown times in the mean level of elision in thetrimeter sequences of the Orestes, a play written by theAncient Greek dramatist Euripides (485–406 B.C.). Change-detection statistics proposed by MacNeill (1978) and Jandhayala and MacNeill(1991) are adopted for this purpose. Analysis of the trimetersequences yields several points of change. A general explanation fortheir occurrence appears to be that Euripides varies his use ofelision according to the emotional content of his text, i.e., heseems to change the form to support the content and, thus, seems touse elision frequency as a dramatic instrument.     

基于V-BLAST的MIMO无线通信系统性能分析

重点对多输入多输出（MIMO）无线通信系统的信道模型、空时分组码（Alamouti）以及垂直分层空时码（V-BLAST）空间复用技术进行了仿真分析.首先利用MATLAB在信道建模中实现了基于瑞利环境下的信道容量仿真图,同时仿真并分析了天线相关性对信道容量的影响;然后进行了Alamouti方案和最大比接收合并（MRRC）之间的仿真分析;最后对V-BLAST系统中的线性检测（ZF）算法和最小均方误差（MMSE）算法做了仿真比较,从而得出V-BLAST系统优于非V-BLAST体系下的误码性能.     

C+ +中构造函数的深入分析

深入分析了拷贝构造函数和转换构造函数的作用和实现方法,并指出了程序设计中出现的问题和解决方法。     

改进小波阈值函数在局放去噪分析中的应用

为解决局部放电信号检测中白噪声的抑制问题,在D. L. Donoho 和I. M. Johnstone 提出的多分辨分析小波阈值去噪方法的基础上,构造了一个双变量阈值函数.该阈值函数通过改变k值来调节阈值化小波系数与原始小波系数之间的恒定偏差;并通过改变参数m来调节平滑过渡区内曲线的阶次,用于局部微调,弥补了硬阈值法不连续性和软阈值法具有偏差的不足.仿真结果表明,改进后的小波阈值函数的信号去噪效果明显,具有较高的实用价值.     

多分辨率建模技术在无线传感器网络仿真中的应用

由于无线传感器网络具有超大规模、与环境耦合紧密等特点,物理实验不可避免受到限制,仿真建模因此成为重要的研究手段.多分辨率建模作为复杂系统分布式仿真的关键技术,能够很好地满足无线传感器网络的仿真需要.本文简述了多分辨率建模相关的理论与技术,对其在无线传感器网络仿真研究中的应用意义做了分析,并且基于多分辨率建模方法提出了一种新的传感器网络仿真框架,最后通过仿真试验论证了新框架的可行性.     

Action research in policy making: a case in the dairy industry in Gujarat,India

Action research has been extensively used world-wide for decision making related to policy due to its nature of involving the researcher and decision maker in the process. Following independence in India, one of the major revolutions was brought about in the dairy sector with regard to complete management systems. Most innovations and changes occurred in the line function while the staff function was more often neglected in the overall change. The authors undertook an action research study focusing on staff function and relayed improvements that can influence policy related to decision making. The authors have also developed the MPS model for staff function which can help a company or industry in appraising their own staff and functions which can thereby aid in utilising their potential.     

多元线性回归分析在机组发电耗水率中的应用

多元线性回归分析是一个有广泛适用性的多元统计分析方法。本文利用葛洲坝发电站的部分数据,对葛洲坝发电站一段时间内的库水位、出库流量及其对应的机组耗水率利用多元线性回归进行建模分析。显然,对这个问题的深入研究,可以有效地认识各种因素对机组发电耗水率的影响程度,从而可以更好地对机组发电耗水率进行预测。     

直扩系统中伪随机码序列调制的DPSK调制器

论文概括介绍了直扩系统中伪随机编码调制的差分移相键控调制器的原理、方框图及用高密度的集成电路实现的方法。这种用PN码序列调制的DPSK扩频调制器能较好地抑制载波。     

中国人口分布及空间相关分析

利用2000年人口普查信息，介绍了在人口地理信息系统中，通过三维模型显示，罗伦斯曲线，人口重心和人口潜力等方法，分析中国人口分布的特征。在此基础上，用空间相关方法对人口分布的现象进行分析，揭示了其空间地理分布的内在联系。     

局域网中网络资源访问故障分析与解决方案

随着网络技术的发展,在局域网环境下计算机用户可以很简单的实现资源共享,但其他用户在访问共享资源时,经常出现“拒绝访问”、“权限不足”等错误提示。文章详细分析了故障产生的原因,并对故障的解决方案进行了研究。     

空分压缩机组安全完整性技术等级(SIL)技术评估应用及分析

依据相关IEC和API标准,对空分装置三大机组(蒸汽透平、空压机和增压机)的安全联锁系统(SIS)做了安全完整性等级(SIL)技术评估,确定了空分三大机组安全联锁系统中的安全联锁功能(SIF),给出了各安全联锁功能(SIF)所需达到的安全完整性等级(SIL),提出并分析了空分三大机组安全联锁系统中存在的多个典型问题,最后针对问题分别给出了相应的改进建议。研究结果对空分装置三大机组和类似机组的安全、稳定、长周期运行有借鉴意义。     

Modeling interregional commodity flows with incorporating network autocorrelation in spatial interaction models: An application of the US interstate commodity flows

Spatial interaction models are frequently used to predict and explain interregional commodity flows. Studies suggest that the effects of spatial structure significantly influence spatial interaction models, often resulting in model misspecification. Competing destinations and intervening opportunities have been used to mitigate this issue. Some recent studies also show that the effects of spatial structure can be successfully modeled by incorporating network autocorrelation among flow data. The purpose of this paper is to investigate the existence of network autocorrelation among commodity origin–destination flow data and its effect on model estimation in spatial interaction models. This approach is demonstrated using commodity origin–destination flow data for 111 regions of the United States from the 2002 Commodity Flow Survey. The results empirically show how network autocorrelation affects modeling interregional flows and can be successfully captured in spatial autoregressive model specifications.     

HLA面向对象的分析法在燃气轮机仿真的应用

高层体系结构HLA以其突出的互操作性和可重用性,成为当今分布式交互仿真系统结构标准,研究基于HLA的仿真程序设计方法对于分布式交互仿真系统的开发具有重要意义。简要介绍了高层体系结构的组成。着重就HLA的对象模型与传统的面向对象方法建立的对象模型的异同进行了探讨。最后,以三轴燃气轮机为例,从应用的角度分析了基于HLA的动力仿真系统开发过程和方法,说明采用传统的面向对象分析方法设计的对象模型是可以比较容易地移植到HLA上的。HLA对象模型使仿真应用成为一种构槊的恿想与方法,为复杂系统的建模与仿真提供了一条有效的途径。     

Semantic Inference for Anaphora Resolution: Toward a Framework in Machine Translation

Anaphora is a discourse-level linguistic phenomenon.There is consensus that anaphora resolution shouldrely on prior sentences within the context of thediscourse. We propose to cast anaphora resolution asa semantic inference process in which a combination ofmultiple strategies, each exploiting different aspectsof linguistic knowledge, is employed to provide acoherent resolution of anaphora. A framework whichencompasses several salient linguistic parameters suchas grammatical role, proximity, repetition, sentencerecency and semantic cues is demonstrated. This workalso shows how an anaphora-resolution algorithm can beembedded within a framework which captures all theabove salient parameters, as well as remedies some ofthe inadequacies found in any monolithic resolutionsystem. A language-neutral semantic representationcharacterized by semantic cues is presented in orderto capture the distilled information after resolution.The effectiveness of the language-neutralrepresentation, both for machine translation andanaphora resolution, is demonstrated through a set ofsimulations and evaluations.     

混合多址中一种伪码捕获算法的性能分析

提出了一种混合多址系统伪码捕获的实现结构,并且与几种经典结果进行了性能比较,结果表明这种方法具有一定优越性.该结构主要是采用频域并行处理作为伪码相关器,通过控制载波NCO频率消除载波频偏对伪码捕获的影响,并且根据自适应门限准则基本消除了输入信号波动对检测性能的影响,又根据恒虚警概率准则满足了对输入信噪比的大动态范围要求.文中提供了详细的推导公式,推导出了该结构下各性能指标较为简约的计算公式,方便读者理解和应用.另外还给出了这种混合多址系统伪码捕获实现结构仿真结果并通过了Monte Carlo实验验证.     

CDMA系统中多用户检测技术的分析

多用户检测技术是第三代移动通信系统的关键技术,具备良好的抗多址干扰和远近效应性能。从移动通信系统抗干扰的角度出发,分析了CDMA系统中多址干扰(MAI)的产生原因,对多用户检测(MUD)技术的概念系统模型以及常用的MUD算法进行了阐述,并指出其局限性和研究方向。     

Workplace development in Sweden: Some preliminary findings from the Work Life Fund

Sweden has traditionally been seen as one of the leading societies in work life reform. The most recent reform program, The Work Life Fund, set up with clear instructions to improve the work environment and at the same time raise productivity, was launched in 1990 and came to an end early in 1994. More than 10000 so called workplace development programmes have been carried through. A summary of the results is being executed and a close investigation of more than 100 cases in different settings has been carried out. Three different development processes thereby become visible. The analysis shows that the Fund quite often has initiated a transition from relatively simple, technically oriented, traditional health and safety projects, towards concept driven change. The most successful cases seem to be projects comprising a development organisation with the building blocks: top management committed to, and involved in, the change process; project organisation; participatory structure; heavy investments in training.     

Remote sensing estimates of glacier mass balances in the Himachal Pradesh (Western Himalaya, India)

Although they correspond to an important fraction of the total area of mountain glaciers (33,000 km² out of 546,000 km²), Himalayan glaciers and their mass balance are poorly sampled. For example, between 1977 and 1999, the average area surveyed each year on the field was 6.8 km² only. No direct mass balance measurement is available after 1999. To contribute to fill this gap, we use remote sensing data to monitor glacier elevation changes and mass balances in the Spiti/Lahaul region (32.2°N, 77.6°E, Himachal Pradesh, Western Himalaya, India). Our measurements are obtained by comparing a 2004 digital elevation model (DEM) to the 2000 SRTM (Shuttle Radar Topographic Mission) topography.The 2004 DEM is derived from two SPOT5 satellite optical images without any ground control points. This is achieved thanks to the good on-board geolocation of SPOT5 scenes and using SRTM elevations as a reference on the ice free zones. Before comparison on glaciers, the two DEMs are analyzed on the stable areas surrounding the glaciers where no elevation change is expected. Two different biases are detected. A long wavelength bias affects the SPOT5 DEM and is correlated to an anomaly in the roll of the SPOT5 satellite. A bias is also observed as a function of altitude and is attributed to the SRTM dataset. Both biases are modeled and removed to permit unbiased comparison of the two DEM on the 915 km² ice-covered area digitized from an ASTER image.On most glaciers, a clear thinning is measured at low elevations, even on debris-covered tongues. Between 1999 and 2004, we obtain an overall specific mass balance of − 0.7 to − 0.85 m/a (water equivalent) depending on the density we use for the lost (or gained) material in the accumulation zone. This rate of ice loss is twice higher than the long-term (1977 to 1999) mass balance record for Himalaya indicating an increase in the pace of glacier wastage. To assess whether these ice losses are size-dependant, all glaciers were classified into three samples according to their areal extent. All three samples show ice loss, the loss being higher for glaciers larger than 30 km². In the case of the benchmark Chhota Shigri glacier, a good agreement is found between our satellite observations and the mass balances measured on the field during hydrological years 2002-2003 and 2003-2004. Future studies using a similar methodology could determine whether similar ice losses have occurred in other parts of the Himalaya and may allow evaluation of the contribution of this mountain range to ongoing sea level rise.