Secure Occupancy: A New Framework for Analysing Security in Rental Housing

Unlike debates about security for owner occupiers which recognise that security is complex and multi-layered, security for renters is often presented as single dimensional and conflated with de jure security of tenure, deriving from a property rights perspective. This article proposes a broader concept of ‘secure occupancy’ to enable a more nuanced understanding of security for tenants. A new framework is developed to enable investigation of the dynamic interactions between legislation/regulation, housing market conditions, public policies and cultural norms around renting, which shape security of occupancy for tenants. The paper illustrates this approach, drawing on a study of the rental systems of nine developed countries, identifying key factors that appear to have a strong bearing on strengthening, and weakening, of security of occupancy for renter households. The article concludes that this approach has the potential to deepen understanding of security for renters and to stimulate new avenues for research.     

供应链协同系统的安全体系的设计与实现

为了解决基于互联网的供应链协同系统的信息安全问题,提出了一种层次型安全框架。基于中间件技术设计了供应链协同系统的构架,分别论述了对供应链协同系统中的网络接入安全、数据传输安全、用户身份认证和数据库访问的安全策略等问题,并将多种安全技术集成应用到该框架中。最后,给出了该安全框架的一个具体应用案例。     

基于TTS语音模块的人体感知电子解说系统设计

介绍一种基于单片机和科大讯飞TTS语音模块的人体感知电子解说系统,可用于旅游景点或相关展品的智能解说。利用热释电红外传感器获取人体接近信息,配合TTS语音模块完成对相关景点或展品的自动解说与信息播报功能。文中给出了系统的详细硬件设计方案及主要软件流程图。经测试,该系统稳定地实现了当人体接近特定地点时的语音信息自动播报功能,可给同类装置的设计及应用提供借鉴。     

Medium wave DRM field trials in Brazil – Some daytime and nighttime results in urban environment

The Digital Radio Mondiale (DRM) system broadcasts audio in the frequency band below 174 MHz  and . In this experiment in urban areas in Brazil, a hybrid signal composed of an analog AM signal and a digital DRM30 signal, with the same content, were broadcasted in diurnal and nocturnal transmissions. This paper describes the experimental setup, which employs the spectral shaping technique in simulcast transmission [14], and presents some results of medium wave propagation measurements campaigns that are being carried out in Brazil. The experiment is part of a series of field trials that are being conducted by the Brazilian Government which includes campaigns at MW, HF and VHF frequency bands.     

Pinwheel broadcast paradigm in supporting energy‐saving mobile devices

Because of the limited bandwidth and restricted number of channels in the wireless access environment, the broadcast paradigm has become an important technique for accessing messages. Energy saving is an important issue in the mobile computing environment. In this paper, we propose a multichannel broadcast paradigm that constructs the broadcast channels according to the access frequency of each type of message in order to save energy in mobile devices (MDs). The pinwheel scheduling algorithm (PSA) presented in this paper is used to organize all types of messages in the broadcast channels in the most symmetrical distribution in order to reduce both the tuning time and the access time. The performance of the proposed mechanism is analyzed, and the improvement over existing methods is demonstrated numerically. The results show that the proposed mechanism is capable of improving both the tuning time and the access time due to the presence of skewness in the access distribution among the disseminated messages. When the number of message types increases, both the tuning time and the access time can be further improved as long as a small number of broadcast channels are added. Copyright © 2009 John Wiley & Sons, Ltd.     

多数据项广播调度策略

多数据项广播是移动计算环境中一种重要的数据访问方式.为减少用户的平均访问时间和响应最多事务请求,提出了一种新的多数据项广播调度策略.调度策略分为两个阶段,第一阶段根据各事务包含的数据项数目和对重复申请数据项的处理选择事务请求;第二阶段对已选择的事务请求用QEM算法进行调度.实验结果表明,它比现有的QEM算法有更高事务调度成功率和更短的平均访问时间.     

一种新的传感器网络混合广播调度方法

由于传感器网络所使用无线信道的共享性和相互干扰, 节点间数据广播会产生资源冲突, 广播调度要解决的即是为每个节点分配到一个无冲突传输时隙, 其目标是找到最优时分复用(TDMA: time division multiple access)调度解, 使得帧长度最短而信道利用率最大. 提出基于神经网络的两阶段混合广播调度算法. 在阶段一, 使用改进的顶点着色算法来获得调度所需最短时隙数目; 在阶段二, 使用模糊Hopfield网络将节点模糊聚类为M类, 同类节点可以在同一时隙被调度, 不同类节点必须在不同时     

On optimal scheduling for time-constrained services in multi-channel data dissemination systems

We study the problem of disseminating data of time-constrained services through multiple broadcast channels. By time-constrained services, we mean those services whose data must reach clients before a certain constrained time. Otherwise, the data would become useless or substantially less valuable to the clients. We first explore the difficulties of solving the problem and derive the theoretical minimum number of channels required for the task. Then, we propose a transformation-based data allocation (TDA) algorithm that guarantees to fulfill the task (i.e., all requested data reach the clients within the constrained time) by using the minimum number of channels. Finally, we analyze the computation complexity and prove the validity and optimality of the TDA algorithm.     

Issues in defining and assessing features of attachment figures: Reply to Kobak (2009).

This reply to Kobak’s (see record 2009-12106-002) comments on my article (see record 2009-12106-001) on dogs as attachment figures addresses three issues in defining and assessing features of attachment figures. These include whether some features are more critical than other features, different ways of assessing safe haven as a critical feature of an attachment figure, and whether attachment hierarchies are necessary to identify figures who fulfill the feature of safe haven. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于身份密码的安全电子邮件系统

针对现有电子邮件系统中的安全性问题,采用基于身份的密码体制和基于内容的过滤扫描技术,构建具有反垃圾／反病毒功能的邮件服务器及具有涉密扫描功能的邮件网关服务器,设计并实现了邮件系统客户端及其必备管理控制中心。系统具有扫描并过滤涉密邮件、加密或解密邮件、签名或认证邮件等功能,能够满足在不可控、动态和松散企业组织成员问的安全通信。