Xgboost application on bridge management systems for proactive damage estimation

Bridge inspection is one of the most fundamental tasks in bridge management practices. Because of limited professional manpower and budget constraints, providing prior information about possible damage can reduce inspection errors and time. The purpose of this study was to estimate the condition of bridges at a damage level, considering various influencing factors for seven different damage types by six different main structure types, using data from the Korean Bridge Management System. The extreme gradient boosting (XGBoost) method was used because it has the advantage of not assuming determinacy and independence, and it clearly can handle the numerous variables that affect damage to bridges. As a result, out of the 38 decision trees that were generated, 36 trees were derived with significant performance measures. The influence of the variables was calculated by the Shapley Additive Explanation (SHAP) value. Age, average daily truck traffic, vehicle weight limit, total length, and effective width were found to be the major factors that influenced damage to bridges. This study confirmed that more detailed structural factors were significant contributors to severe damage to complex structural designs and the use of multiple kinds of materials, such as the cross-sectional properties of girders for the concrete deck of bridges with steel girders compared to the properties of the decks for bridges made of a simple slab of reinforced concrete. The research findings emphasized the benefits of artificial intelligence in the analysis of the conditions of bridges and showed its potential for use in network-level decision making for preventive maintenance.     

Morphosis Architects' Cooper Union Academic Building,New York

Thom Mayne and his colleagues have packed a lot of architecture and a number of very practical spaces into one small city block in the firm's first major New York building. Jayne Merkel describes the dramatic skylighted central staircase that sweeps through the new academic building for the prestigious Cooper Union for the Advancement of Science and Art, surrounded by efficient classroom, office and studio space with exciting views of the city all around. Copyright © 2010 John Wiley & Sons, Ltd.     

Empirical investigation of stochastic local search for maximum satisfiability

The maximum satisfiability (MAX-SAT) problem is an important NP-hard problem in theory, and has a broad range of applications in practice. Stochastic local search (SLS) is becoming an increasingly popular method for solving MAX-SAT. Recently, a powerful SLS algorithm called CCLS shows efficiency on solving random and crafted MAX-SAT instances. However, the performance of CCLS on solving industrial MAX-SAT instances lags far behind. In this paper, we focus on experimentally analyzing the performance of SLS algorithms for solving industrial MAXSAT instances. First, we conduct experiments to analyze why CCLS performs poor on industrial instances. Then we propose a new strategy called additive BMS (Best from Multiple Selections) to ease the serious issue. By integrating CCLS and additive BMS, we develop a new SLS algorithm for MAXSAT called CCABMS, and related experiments indicate the efficiency of CCABMS. Also, we experimentally analyze the effectiveness of initialization methods on SLS algorithms for MAX-SAT, and combine an effective initialization method with CCABMS, resulting in an enhanced algorithm. Experimental results show that our enhanced algorithm performs better than its state-of-the-art SLS competitors on a large number of industrial MAX-SAT instances.     

关于一种智能大厦信息系统集成新方案的探讨

本文介绍了智能大厦系统集成的功能目标及目前主要的系统集成方式，在指出现有系统集成方式缺陷的基础上，探讨更为先进的解决方案-基一于Internet/Intranet企业网信息集与网络平台上，采用IBMS（Integrated Building Management System)技术开发的智能大厦系统集成方式，并介绍了其软件的构成和功能。     

基于OPC的建筑管理系统集成研究

建筑管理系统(BMS)集成是智能建筑一体化集成的前提，但在BNS系统集成进程中却存在着严重障碍，即各子系统之间难以实现开放的、无缝隙的联接。OPC是与厂商无关的软件数据交换标准接口和规程，为解决这一问题提供了先进的技术手段。OPC技术保证了BMS系统集成的开放性。     

基于DSP的电动汽车蓄电池管理系统

利用DSP芯片TMS320LF2407的特性,设计了一种新型的电动汽车蓄电池管理系统,完成了对蓄电池的剩余电量的预测、系统的软硬件设计,并进行了仿真实验,实验结果表明系统快速、稳定.     

火灾自动报警及消防联动控制实验系统

为了让学生对火灾自动报警及消防联动控制系统有一个整体认识,研究了建筑设备综合管理实验系统中的总体设计方案、火灾自动报警系统、消防联动控制演示、自动水喷淋灭火控制系统、消火栓灭火系统、防排烟设备的联动控制、迫降模型电梯归底、切除非消防电源、消防子系统与其他子系统的关系实验系统的设计,以及本系统可开展的实验。     

建筑设备管理系统的设计与开发

系统集成是实现建筑智能化的核心技术方法，它将各智能化子系统从功能到应用进行开发及整合，实现集成管理、系统联动、设备的优化运行和节能。本文介绍了长安大学-Honeywell智能建筑实验室建筑设备管理系统BMS（Building Management System）的设计与实施、开发过程以及基于集成管理软件所开发的实验内容。学生通过实验操作认识BMS的功能作用，提高综合素质和创新开发能力。     

建筑设备管理系统的设计与开发

系统集成是实现建筑智能化的核心技术方法,它将各智能化子系统从功能到应用进行开发及整合,实现集成管理、系统联动、设备的优化运行和节能。本文介绍了长安大学-Honeywell智能建筑实验室建筑设备管理系统BMS(Building Management System)的设计与实施、开发过程以及基于集成管理软件所开发的实验内容。学生通过实验操作认识BMS的功能作用,提高综合素质和创新开发能力。     

基于X3100的锂离子电池组管理系统

本文设计的锂离子电池组管理系统中采用MC9S12C32为控制核心,X3100检测电压、电流,实现充电均衡和保护功能;DS18B20检测电池温;电容均衡模块实现放电均衡.该系统能够实时监控电池组状态;实现单体电池的过压、欠压、过流、温度保护;实现电池的充放电电量均衡;确保电池组安全工作,并延长电池组寿命.