Centralized and decentralized optimal decision support for congestion management

This paper presents a framework to carry out optimal power flow in a coordinated multi-transaction/utilities decentralized system. An AC power flow model has been used in this work for independent optimal dispatch of each utility. The global economic optimal solution of the whole electric energy system with congestion management has also been done in this work using the interior point (IP) optimization procedure. In this approach, each participant tries to maximize its own profit with the help of information announced by the operator which are information related to system security constraints and public issues. The developed algorithm can be run in parallel, either to carry out numerical simulations or to obtain an optimal generation schedule in an actual multi-utility electric system. The study has been conducted on a three utility modified IEEE-30 bus system with two market models and six utility modified IEEE-118 bus system. The results clearly show the effectiveness of the suggested IP optimization based optimal generation schedule in decentralized scenario. It has been demonstrated that the suggested decentralized approach produces improved optimal dispatch solution with enhanced market benefits and can effectively manage the congestion in the system as compared to the centralized approach.     

A survey on blockchain-based integrity auditing for cloud data

With the rapid advancement of cloud computing, cloud storage services have developed rapidly. One issue that has attracted particular attention in such remote storage services is that cloud storage servers are not enough to reliably save and maintain data, which greatly affects users’ confidence in purchasing and consuming cloud storage services. Traditional data integrity auditing techniques for cloud data storage are centralized, which faces huge security risks due to single-point-of-failure and vulnerabilities of central auditing servers. Blockchain technology offers a new approach to this problem. Many researchers have endeavored to employ the blockchain for data integrity auditing. Based on the search of relevant papers, we found that existing literature lacks a thorough survey of blockchain-based integrity auditing for cloud data. In this paper, we make an in-depth survey on cloud data integrity auditing based on blockchain. Firstly, we cover essential basic knowledge of integrity auditing for cloud data and blockchain techniques. Then, we propose a series of requirements for evaluating existing Blockchain-based Data Integrity Auditing (BDIA) schemes. Furthermore, we provide a comprehensive review of existing BDIA schemes and evaluate them based on our proposed criteria. Finally, according to our completed review and analysis, we explore some open issues and suggest research directions worthy of further efforts in the future.     

基于区块链的远程证明模型

远程证明是构建可信网络的核心。但是,当前的远程证明模型仅面向有中心的网络,存在网关中心化、决策单点化的问题,并不适用于去中心的场景。针对去中心分布式网络环境中计算节点无法进行远程证明的问题,借鉴区块链的思想,提出了一种基于区块链的远程证明模型(Remote Attestation Based on blockchain,RABBC),并重点描述了模型框架、区块链核心结构和协议过程。分析表明,RABBC具有去中心化、可追溯、匿名、不可篡改的安全特性,并具备较高的效率。     

基于NK模型的复杂系统中的组织结构分析

企业规模的扩大和环境的剧烈变化正在使企业的组织结构和经营活动越来越复杂。从企业动态演化的角度来看。组织结构不仅仅是一个静态和比较分析的概念,更是一个以提高企业绩效为目的、在长期内赢得竞争优势的过程。组织结构从决策权力分配的特征考虑可以分为集权模式和分权模式。通过一个绩效景观模拟模型可以观察到,当企业的决策问题结构"可分解"时,永久分权的组织模式能够给企业带来快速发展的能力,在短期和长期内都能实现较高的绩效。当决策结构"不可分解"时,一种先分权再集权的整合模式在长期内可以使企业达到最佳绩效,但是企业必须承受前期分权模式带来的绩效损失。在决策结构"不可分解"的情况下,只要允许企业分权游走足够长的时间,企业的绩效总能超过永久集权模式的游走,并且复杂性的增加并没有明显削弱整合模式相对集权模式提升绩效的能力。     

世界遗产和国家重点风景名胜区分权化(属地)管理体制的制度缺陷

首先讨论了国际分权化改革的背景和条件约束;其次,着重讨论了自然文化遗产资源的特殊性、分权管理体制的制度缺陷和分权管理与门票收费较高的关系;最后,提出了改革分权化管理的建议.     

后新冠肺炎疫情时代城市的加速智能化

Governments, developers and big-tech companies have become enamoured with the possibility of the smart city: an efficient, convenient (and profitable) “smart” metropolis to help accommodate and optimize rapid urban growth. While it is tempting to wash renders of future cities with the typical smart city visions of drones, segways, and shiny reflective glass towers—the reality is that good (smart) cities incorporate a bottom-up messiness and urban vitality which is fundamental to the overall thriving of the city. In Hassell’s competition winning scheme for the Xinqiao District in Shenzhen—the design team explored the ideas that a smart and innovative city that first and foremost uphold—a place which fosters inclusivity, diversity, collaboration, and resilience. Now through times of ongoing uncertainty in the COVID-19 era, Hassell’s design team expects an even greater adoption of smart cities rhetoric as a form of necessary urban surveillance and to manage and support communities and the containment of the COVID-19—building urban resilience against big disaster events, enabling adaptive environments that can re-calibrate, reorganize, and evolve in real-time as needed. Can urban designers go beyond resilience to imagine cities which thrive and grow out of disaster events?