Urban Accessibility in Motorcycle Dependent Cities - Case Study in Ho Chi Minh City, Vietnam

Motorcycle dependent cities have specific characteristics in terms of urban accessibility.A rapid increase in the number of motorcycles and other private motorized modes make transport problems more serious and cause severe capacity problems for the infrastructure systems in these cities.Therefore,it is necessary to optimize the development of different modes to meet travel demand and to ensure accessibility in all urban areas.This paper aims to explore accessibility conditions in Ho Chi Minh City,a typical motorcycle dependent city in Vietnam.Understanding of accessibility could be the key element for urban planning in Ho Chi Minh City in particular and motorcycle dependent cities in general.Then,management measures for motorcycles and competitive modes will be proposed to improve the accessibility conditions and thus support sustainable urban transport development for motorcycle dependent cities.

COORDINATE MEASURING MACHINE PROBING ACCESSIBILITY

The accessibility of coordinate measuring machines (CMMs) in dimensional inspection is studied. The problem of computing the global accessibility cone is solved using a method of angle representation. Otherwise, the length and volume of probe are considered sufficiently so that all the feasible probe orientations could be determined for the inspection of a workpiece when a touch trigger probe is used and the shortcoming of abstracting a probe as an infinite half line could be overcome completely. In the end, an example is given to explain the method.

BBACIMA:A Trustworthy Integrity Measurement Architecture through Behavior-Based TPM Access Control

Two limitations of current integrity measurement architectures are pointed out： （1） a reference value is required for every measured entity to verify the system states, as is impractical however; （2） malicious user can forge proof of inexistent system states. This paper proposes a trustworthy integrity measurement architecture, BBACIMA, through enforcing behavior-based access control for trusted platform module （TPM）. BBACIMA introduces a TPM reference monitor （TPMRM） to ensure the trustworthiness of integrity measurement. TPMRM enforces behavior-based access control for the TPM and is isolated from other entities which may be malicious. TPMRM is the only entity manipulating TPM directly and all PCR （platform configuration register） operation requests must pass through the security check of it so that only trusted processes can do measurement and produce the proof of system states. Through these mechanisms malicious user can not enforce attack which is feasible in current measurement architectures.

Robustness self-testing of states and measurements in the prepare-and-measure scenario with 3 → 1 random access code

Recently, Tavakoli et al.proposed a self-testing scheme in the prepare-and-measure scenario, showing that self-testing is not necessarily based on entanglement and violation of a Bell inequality [Phys.Rev.A 98 062307(2018)].They realized the self-testing of preparations and measurements in an N → 1(N ≥ 2) random access code(RAC), and provided robustness bounds in a 2 → 1 RAC.Since all N → 1 RACs with shared randomness are combinations of 2 → 1 and 3 → 1 RACs, the3 → 1 RAC is just as important as the 2 → 1 RAC.In this paper, we find a set of preparations and measurements in the3 → 1 RAC, and use them to complete the robustness self-testing analysis in the prepare-and-measure scenario.The method is robust to small but inevitable experimental errors.

Space-Time Correlation Based Fast Regional Spectrum Sensing in Cognitive Radio

In this paper,a space-time correlation based fast regional spectrum sensing(RSS)scheme is proposed to reduce the time and energy consumption of traditional spatial spectrum sensing. The target region is divided into small meshes,and all meshes are clustered into highly related groups using the spatial correlation among them. In each group,some representative meshes are selected as detecting meshes(DMs)using a multi-center mesh(MCM)clustering algorithm,while other meshes(EMs)are estimated according to their correlations with DMs and the Markov modeled dependence on history by MAP principle. Thus,detecting fewer meshes saves the sensing consumption. Since two independent estimation processes may provide contradictory results,minimum entropy principle is adopted to merge the results. Tested with data acquired by radio environment mapping measurement conducted in the downtown Beijing,our scheme is capable to reduce the consumption of traditional sensing method with acceptable sensing performance.

Novel space-time multiuser detection algorithm of WCDMA system

The structure and performance of space-time multiuser detection receiver at base stations of WCDMA system is analyzed, in which smart antenna is employed. WCDMA uplink signal model is established in this paper. Space-time multiuser receiver presented in this paper combines 2D-RAKE with parallel interference cancellation (PIC), and the improved parallel interference cancellation methods are given. A novel space-time multiuser detection scheme, 2DRAKE-GPPIC is proposed. This scheme employs smart antenna to suppress unexpected DOA (Direction Of Arrival) signal, uses RAKE receiver to combine different delays of expected signal, and utilizes grouped partial parallel interference cancellation (GPPIC) algorithm to suppress further the interference signal in the main lobe of array antennas. The simulation results reveal that the scheme of space-time multiuser detection presented in this paper has better performance for WCDMA system.

First application of large reactivity measurement through rod drop based on three-dimensional space–time dynamics

Abstract Reactivity measurement is an essential part of a zero-power physics test,which is critical to reactor design and development.The rod drop experimental technique is used to measure the control rod worth in a zero-power physics test.The conventional rod drop experimental technique is limited by the spatial effect and the difference between the calculated static reactivity and measured dynamic reactivity;thus,the method must be improved.In this study,a modified rod drop experimental technique that constrains the detector neutron flux shape function based on three-dimensional space–time dynamics to reduce the reactivity perturbation and a new method for calculating the detector neutron flux shape function are proposed.Correction factors were determined using Monte Carlo N-particle transport code and transient analysis code for a pressurized water reactor at the Ulsan National Institute of Science and Technology and Xi’an Jiaotong University,and a large reactivity of over 2000 pcm was measured using the modified technique.This research evaluated the modified technique accuracy,studied the influence of the correction factors on the modification,and investigated the effect of constraining the shape function on the reactivity perturbation reduction caused by the difference between the calculated neutron flux and true value,using the new method to calculate the shape function of the detector neutron flux and avoiding the neutron detector response function(weighting factor)calculation.

Research on Traffic Accessibility and Transportation Integration Level of Chang-Zhu-Tan City Group in China

Aiming at the problem of lack of data model to analyze the level of transportation integration, the paper taking Changsha-Zhuzhou-Xiangtan City Group of China as the research object, based on the Gravity measurement model, transportation comprehensive distance model, weighted road density model, analysis of Changsha-Zhuzhou-Xiangtan City Group accessibility and transportation integration level. A new method to measure the level of traffic integration is proposed and verified by the road network data and socio-economic data of Changsha-Zhuzhou-Xiangtan City Group. The results show that: Changsha-Zhuzhou-Xiangtan City Group traffic accessibility was “point to surface” shape distribution, taking the core region of Changsha as the optimal, Xiangtan, Zhuzhou, Changsha County next, in remote Yanling County, Chaling county has the lowest accessibility;the correlation between traffic network connection degree and economic connection degree reached 0.871, indicating that the transportation integration level of urban agglomerations has a high degree of fit with the level of economic integration. The research results on the one hand for the Chang-Zhuzhou-Xiangtan urban agglomeration traffic present situation to make an annotation;on the other hand, that provide a reference for further optimization of Changsha-Zhuzhou-Xiangtan urban agglomeration traffic planning.

CLOSED-FORM SPACE-TIME CHANNEL BLIND ESTIMATION FOR SPACE-TIME CODED MC-CDMA SYTEMS WITH UNIFORM LINEAR ARRAY

This paper proposes a closed-form joint space-time channel and Direction Of Arrival （DOA） blind estimation algorithm for space-thne coded Multi-Carrier Code Division Multiple Access （MC-CDMA） systems equipped with a Uniform Linear Array （ULA） at the base station in frequency-selective fading environments. The algorithm uses an ESPRIT-like method to separate multiple co-channel users with different impinging DOAs. As a result, the DOAs for multiple users are obtained. In particular, a set of signal subspaces, every one of which is spanned by the space-time vector channels of an individual user, are also obtained. From these signal subspaces, the space-time channels of multiple users are estimated using the subspace method. Computer simulations illustrate both the validity and the overall performance of the proposed scheme.

SIMPLE AND EFFICIENT SPACE-TIME CHANNEL AND DOA ESTIMATION TECHNIQUES IN TD-SCDMA SYSTEMS

In this paper, a simple method is presented for multi-user space-time channel estimation in Time Division-Synchronized Code Division Multiple Access (TD-SCDMA) systems. The method is based on a spe- cific midamble assignment strategy, which results in a cyclic Toeplitz midamble-matrix in the linear equation of the received data vectors. A Fast Fourier Transform (FFT)-based algorithm is used to obtain the estimate of the uplink multi-user space-time channels. Furthermore, the estimated space-time channel is applied to the identification of multi-paths for each user, and Direction Of Arrival (DOA) estimation for each path is carried out by using the extracted spatial signature vector. Aside from the simplicity in computation, the proposed di- rection of arrival estimation method can effectively resolve multi-paths regardless of the correlation and angle separations of the multi-paths.

On the Eve of China's Accession to WTO New Measures Adopted to Encourage Foreign Investment in China

The terrorist attacks in the United States last month have not slowed down the process of China′saccession to WTO.It is expected that China will eventually join WTO this November.Currently China isworking intensively to revise its economic and foreign trade laws and regulations in conformity with the WTOrules.According to sources from the Ministry of Foreign Trade and Economic Cooperation(MOFTEC),China is to adopt the following measures to further encourage foreign investment in China.

基于“入径结构”的城市街区形态测度方法

为了加强物质形态与行为活动的关联性分析,本文基于街道、场地和建筑三种形态要素之间的拓扑连接关系,提出量化表述城市街区形态特征的“入径结构”方法。建立了街区基本结构以及互锁、并合、套叠三种复杂结构类型的认知理念,基于图论工具提出复杂性指标体系及其计算方法。以南京为例,通过分析高楼门街区的内部构成逻辑,以及不同时期的三个城市中心区的街区类型特征,验证了该方法在两个尺度上的实用性与有效性。为认知城市街区形态结构的内在组织逻辑提供了一种科学的测量方法,也为城市设计在微观层面的精细化和数字化发展建立了技术基础。

利用Access数据库进行计量器具管理

介绍应用Access数据库进行计量器具管理的具体操作方法 ,包括有关数据表和查询表的设计、建立及使用方法。

测量标志数据管理系统设计与实现

测量标志数据管理系统是实现测量标志管理信息化的基础,是测量标志数据采集、汇总、查询统计、决策分析的基础。本文详细介绍了以Visual Studio为开发平台、C#为编程语言、结合Microsoft Office Access数据库管理系统及ArcGIS Engine对测量标志数据管理系统进行设计与开发。系统实现了测量标志巡查、托管、维护维修等基本信息的录入、存储、汇总分析等功能,极大地提高了测量标志数据管理信息化能力。

无人机数据隐私和安全保障策略探究

随着无人机技术的广泛应用,其数据隐私和安全问题越来越受到关注。无人机可以捕捉大量的数据,包括视频、图片和其他传感器数据,而这些数据可能涉及个人隐私或敏感信息。首先分析了无人机数据隐私和安全面临的主要挑战,如非法侵入、数据泄露和第三方攻击等;随后,提出了一系列应对策略,包括加密技术、访问控制、数据最小化以及蜂窝网络技术等,来确保数据的完整性和保密性。这些解决方案旨在提供一个综合性的框架,以支持无人机在确保数据隐私和安全的前提下,更好地服务于各种应用领域。

浅析Access数据库系统的安全隐患及防范措施

根据Access数据库系统的各种不安全因素分析其安全隐患,给出了相应的防范措施。

论技术措施反规避条款与合理使用的关系

技术措施反规避条款通过“技术+法律之力”的方式增强了版权的排他性,确保权利人通过交易行使版权。数字环境下作品的获取环节一般不存在市场失灵,且难以事前有效识别规避接触控制技术措施后的行为是消费性的感知还是合理使用,为接触控制技术措施反规避条款设立一个概括的合理使用例外不具有正当性。应识别出因权利保护技术措施反规避条款而被实质阻碍的合理使用场景并予以立法回应,同时向权利人施加充分告知义务,借助市场竞争机制内部化因权利保护技术措施阻碍合理使用而造成的社会成本,促使版权人为合理使用提供最大程度的便利。

论数据确权的一般化路径

《关于建构数据基础制度更好发挥数据要素作用的意见》(以下简称《数据二十条》)颁布之后,不少观点主张将权利客体区分为原始数据、数据集合和数据产品,分别赋予不同类型的数据产权,形成数据确权的复杂化路径。但实际上,区分确权缺乏必要性和可行性,不是最优的确权路径。绝对权意义上的财产权通常具有一般化的特征,表现为客体的抽象性、消极权能的显著性和积极权能的总括性。财产权之所以是一般化的,是由其调整权利人和不特定第三人法律关系的功能决定的。数据产权同样应该是绝对权意义上的财产权,因而数据确权应当采取一般化路径。数据产权的客体应该只是数据,不应该区分原始数据、数据集合和数据产品;数据的物理边界由数据在虚拟层面上的可访问性决定;以数据的可访问性为标准,可以区分建构公开数据产权和非公开数据产权。在数据确权一般化路径的基础上,还应当引入治理策略,一是对法定在先权益进行分离保护,二是明确规定法定访问权和使用权,从而更加精确地调整数据之上承载的多元利益。

一种基于聚合与关联智能合约的电子证照访问控制方法

随着“互联网+政务服务”深入推进,电子证照应用进入了快速建设期。在电子证照管理中,不同的业务需由专门的单位来完成,在传递过程中需要确认参与者的身份并且不能对外泄露。针对电子证照管理的业务特点,本文提出一种基于区块链的可信身份电子证照管理系统与访问控制方法。该方法基于模糊测度,采用多属性聚合算子,通过对用户属性进行聚类评价,从而对用户权限进行访问控制,建立用户权限校验证书和基于使用场景的证照加密,实现电子证照管理在区块链环境下的用户身份可信任、证照防篡改和隐私防泄漏。