6σ成功推行模式探讨

本文介绍企业要成功推行6σ，必须建立好的管理模式，并且要走出误区，同时提出不论企业规模大小，资金多少都可以成功推行6σ。     

实施QS9000标准要注意的几个问题

作者针对ＱＳ９０００标准推行的时间短，且融合了必要的工程方法等特点，提出了企业在贯彻推行该标准的过程中应该注意的一些问题。     

EVA导向下的全面预算管理

对于长期一直以产量为目标的石油企业而言，伴随国资委推行央企EVA的进程，将是—个向价值增值理念转变的机会，但是EVA导向下全面预算管理的推行需要一场深刻的改革。     

无铅技术系列文章二：无铅工艺的重点和考虑

前言：上期我们谈到“无铅技术的发展和对中国SMT界的影响大观”，知道了无铅技术的推行只是个时间上的问题。而对某些行业和企业来说，虽然距离必须推行的期限还有一段时间，不过当考虑到推行所需要的大量准备工作时，此刻已经可算是件急事了。我在下期的文章中会和大家分享在无铅技术的引进和管理工作上的一些关键的考虑点。     

深入剖析广播电视的制播分离

对广播电视的制播分离进行了全新而且深入的论述，回顾了国内外制播分离的历史和现状，剖析了制播分离的运作意义，推行基础和实施难点，归纳了推行制播分离的方法和手段，提炼出制播分离的未来发展方向。     

经营效益与6σ

本文介绍6σ的产生背景GE利用6σ取得品质能力的提升及经营成本的下降等事例，介绍了推行6σ的可行做法，探讨了提高经营效益与推行6σ的有机联系。     

六西格玛推行的"尚方宝剑"--论试验设计与统计过程控制

本文首先对六西格玛与实验设计，六西格玛与统计过程的关系提出了疑问，接着介绍实验设计在六西格玛推行的过程中所扮演的角色，然后深入阐述统计过程控制在六西格玛推行过程中所扮演的角色，最后对实验设计与统计过程控制与六西格玛的关系作了简单的总结。     

积极推行电子政务

继党的十六大提出推行电子政务、提高行政效率之后，十六届三中全会进一步强调要发展电子政务，提高政府的服务和管理水平。深化对推行电子政务意义的认识，正确把握电子政务建设中的关键环节，并采取相应的对策措施，促进电子政务健康发展，是贯彻落实十六大和十六届三中全会精神的一项重要任务。     

美国缘何钟情高杠杆化

如果奥巴马雄心勃勃的增税中途夭折，那么对于高杠杆运营下的美国政府无疑将会留下更少的腾挪转折的空间。勒住裤腰带降低政府开支的做法无疑无法推行政府的援助计划，凯恩斯主义政策的推行将会因为无米下锅而大打折扣。     

坚持科学执政、民主执政、依法执政扎实推进中央国家机关政务公开工作

在建设中国特色社会主义的伟大进程中，党中央、国务院高度重视社会主义民主法制建设，把推行政务公开作为建设社会主义民主政治和落实依法治国基本方略的一项基础性工作。党的十六大对推行政务公开提出了明确要求，十六届三中、四中、五中全会进一步把政务公开作为加强民主法制建设的重要内容作出部署。中共中央办公厅、国务院办公厅专门下发《关于进一步推行政务公开的意见》（中办发[2005]12号，以下简称《意见》，对政务公开工作作出具体安排。中央国家机关各部门、各单位按照党中央、国务院的要求，把政务公开摆上重要位置，加强领导，采取措施，政务公开工作取得了比较大的进展。     

Dynamic scheduling framework on an RLC/MAC layer for general packet radio service

We present a traffic-scheduling framework that can dynamically allocate radio resources to a general packet radio service (GPRS) mobile station (MS) based on the interference levels of the radio links and the quality of service (QoS) specification of the MS. The underlying idea of this scheduling scheme is to preserve more bandwidth for use by those MSs that are within a low interference region so that the limited radio resources can be used more effectively. In this scheme, an MS uses a low transmission rate for data transfer when the MS is within a high interference region to avoid wasting bandwidth by transmitting data in a condition with high interference. In order to compensate for the service loss of the MS, we allocate more bandwidth to the MS when it is within a low interference region. In addition, we also propose an analytical model that can be used to derive the transmission rate for an MS in a low interference region based on the delay-bound requirement of the MS. The performance results show that our dynamic scheme can utilize the bandwidth more effectively to satisfy various QoS requirements of the MSs in the GPRS system without changing the convolution-coding rate.     

Effective VoIP call routing in WLAN and cellular integration

In cellular-WLAN integration, a dual-mode mobile station (MS) typically disables the WLAN module for power saving. A major problem is that for an incoming VoIP call (or data session), the MS will not be able to receive this call from the WLAN. It turns out that the call is directed to the cellular network. This letter proposes a simple push solution where an MS can accurately detect a VoIP call from paging signaling of the cellular network. Then the WLAN module of the MS is turned on and the VoIP call is connected to the MS through the relatively inexpensive WLAN.     

Paging strategy optimization in personal communication systems

Mobility tracking is concerned with finding a mobile subscriber (MS) within the area serviced by the wireless network. The two basic operations for tracking an MS, location updating and paging, constitute additional load on the wireless network. The total cost of updating and paging can be minimized by optimally dividing the cellular area into location registration (LR) areas. In current systems broadcast paging messages are sent within the LR area to alert the MS of an incoming call. In this paper we propose a selective paging strategy which uses the MS mobility and call patterns to minimize the cost of locating an MS within an LR area subject to a constraint on the delay in locating the MS. This revised version was published online in July 2006 with corrections to the Cover Date.     

Te离子注入GaAs的穆斯堡尔谱研究

<正> 对GaAs注入施主型杂质离子Te(或Se,S),在高注入剂量下经高温退火后仍有大量注入原子不能电激活。过去,利用穆斯堡尔谱(简称MS)研究GaAs中Te有过一些工作。William-son等测量了LEP掺125Te的GaAs的MS,Schroyen等及Niesen等测量了129Te注入GaAs的MS,均发现经一定温度退火后GaAs中有相当多的Te不处在代位式。但对非代位式的原因有不同判断,曾提出过的模型有Ga2Te3沉淀、Te-空位组合体和TeASVGa对等。故此问题仍需进一步研究。     

Optimization of association procedure in WiMAX networks with relay stations

When a MS enters to the WiMAX network, a network entry procedure has to be performed. The aim of procedure is twofold. Firstly, several connections between the MS and BS are created, i.e. basic, primary and secondary management connections to control data transmissions. Secondly, the MS is admitted into the network. According to the IEEE 802.16 standard, a MS always tries to associate to BS with the highest received signal quality. This method is suitable as long as the MS is directly connected to the network via BS. However by introducing relay stations to the WiMAX architecture, the MS entry procedure needs to be modified. Mainly, the point of attachment influences the network performance. This paper proposes an optimized association procedure which takes into account the use of relays stations in the network. The obtained results show improvement of system performance.     

Data gathering via mobile sink in WSNs using game theory and enhanced ant colony optimization

Optimal performance and improved lifetime are the most desirable design benchmarks for WSNs and the mechanism for data gathering is a major constituent influencing these standards. Several researchers have provided significant evidence on the advantage of mobile sink (MS) in performing effective gathering of relevant data. However, determining the trajectory for MS is an NP-hard-problem. Especially in delay-inevitable applications, it is challenging to select the best-stops or rendezvous points (RPs) for MS and also to design an efficient route for MS to gather data. To provide a suitable solution to these challenges, we propose in this paper, a game theory and enhanced ant colony based MS route selection and data gathering (GTAC-DG) technique. This is a distributed method of data gathering using MS, combining the optimal decision making skill of game theory in selecting the best RPs and computational swarm intelligence of enhanced ant colony optimization in choosing the best path for MS. GTAC-DG helps to reduce data transfer and management, energy consumption and delay in data delivery. The MS moves in a reliable and intelligent trajectory, extending the lifetime and conserving the energy of WSN. The simulation results prove the effectiveness of GTAC-DG in terms of metrics such as energy and network lifetime.

     

Strain relaxation in epitaxial overlayers

The misfit between an epilayer and a substrate may be accommodated by misfit dislocations (MDs) or misfit strain (MS) or both. In a small misfit system the misfit is accommodated by MS alone up to a critical thickness whereafter the residual MS decreases as the thickness increases. The main objective of this paper is to review theoretical work aimed at understanding MS relief in a growing epilayer by the introduction of MDs, with the view of resolving the discrepancies between predicted and observed critical thickness and residual MS after onset of MS relief. Since the predictions are based on equilibrium principles, equilibrium theories for monolayers (MLs) in the Frenkel-Kontorowa model, and for thickening epilayers (growing ML-by-ML) in the Volterra model, are briefly summarized, including some consideration of the conditions for ML-by-ML growth. Since equilibration can be drastically retarded by barriers to nucleation and motion of dislocations the observed quantities are most often non-equilibrium values. Calculations show (i) that MD sources are normally needed to the onset of MS relief, (ii) that threading dislocations are the “softest” sources, (iii) that even with threading dislocation sources MS relief may lag behind equilibrium predictions and (iv) that Peierls friction may lead to an infinitely large critical thickness.     

Multihop data gathering in wireless sensor networks with a mobile sink

Network performance can be improved by using a mobile sink (MS) to collect sensed data in a wireless sensor network. In this paper, we design an efficient trajectory for MS, collecting data from sensor nodes in a multihop fashion, with the aim of prolonging the network lifetime. Considering event‐driven applications, we present an approach to jointly determine the optimal trajectory for MS and data paths and transmission rates from source nodes to MS, without considering any rendezvous points. In these applications, an MS is supposed to harvest the data from source nodes in a given time‐slot. We first show that this problem is in form of a mixed integer nonlinear programming model, which is NP‐hard. Then, to achieve an approximate solution, we divide the mentioned problem into 2 simple subproblems. In fact, after determining an approximate zone for the trajectory of MS, the optimal data paths and transmission rates from source nodes to the MS are obtained through a mathematical optimization model. Finally, to illustrate the efficiency of the proposed approach, we compare the performance of our algorithm to an rendezvous point–based and also the state‐of‐the‐art approach in different scenarios.     

Two-dimensional correction for min-sum decoding of irregular LDPC codes

Two-dimensional (2-D) correction schemes are proposed to improve the performance of conventional min-sum (MS) decoding of irregular low density parity check codes. An iterative procedure based on parallel differential optimization is presented to obtain the optimal 2-D factors. Both density evolution analysis and simulation show that the proposed method provides a comparable performance as belief propagation (BP) decoding while requiring less complexity. Interestingly, the new method exhibits a lower error floor than that of BP decoding. With respect to conventional MS and 1-D normalized MS decodings, the 2-D normalized MS offers a better performance. The 2-D offset MS decoding exhibits a similar behavior.     

Efficient Masking Methods Appropriate for the Block Ciphers ARIA and AES

In this paper, we propose efficient masking methods for ARIA and AES. In general, a masked S‐box (MS) block can be constructed in different ways depending on the implementation platform, such as hardware and software. However, the other components of ARIA and AES have less impact on the implementation cost. We first propose an efficient masking structure by minimizing the number of mask corrections under the assumption that we have an MS block. Second, to make a secure and efficient MS block for ARIA and AES, we propose novel methods to solve the table size problem for the MS block in a software implementation and to reduce the cost of a masked inversion which is the main part of the MS block in the hardware implementation.