矿山井下危险区两级门禁监控系统设计

矿山井下危险区工况复杂，人员散乱，时常因为无关人员擅自闯入且不能及时处理而导致事故发生。为了提高危险区管理的智能化程度，解决危险区人员管控的难题，基于某矿山的现场调研和需求，通过建立门禁系统工作流程与整体拓扑关系模型，对系统整体方案进行设计；通过对功能模块的合理分布与安装，实现了对门禁系统功能模块的集成；通过对井上与井下现有的网络架构分析，在原有的网络结构上搭建了系统通讯局域网络；通过对井下管理软件与井上调度中心关联，构造了完整的井上-井下两级监控管理系统。门禁系统在安徽某铁矿试运行2个月，整体功能稳定可靠，现场反馈良好。     

Systematic packaging design tools integrating functional and environmental consequences on product life cycle: Case studies on laundry detergent and milk

This study presents systematic packaging design tools integrating functional and environmental consequences on product life cycle. To design packaging for sustainability, the trade-offs between functional and environmental aspects of packaging throughout the product life cycle should be considered. However, it is difficult for packaging designers to understand the overall trade-offs because the extent of the design consequences on the entire life cycle of packaging and its contents is unclear. We developed two tools for packaging design: the Life Cycle Association Matrix (LCAM) and the Function Network Diagram (FND). The following three steps, based on literature reviews and interviews with industrial experts, were applied. Firstly, we listed the product functions and design variables related to the functions as the attributes allocated to the product life cycle. Secondly, the attributes were connected appropriately based on causal relationships. Lastly, we identified the factors to support decision making in the packaging design procedure. As a result, the LCAM depicts the design consequences on the life cycle, and the FND determines the stakeholders affected by the design consequences. Two case studies were demonstrated to analyze the trade-offs by using our tools. In the case studies, a liquid laundry detergent bottle and a milk carton were redesigned. The tools identified the design consequences and stakeholders affected by the redesign of the usability and protective function for the detergent and milk cases, respectively. The results showed the significance of understanding the design consequences on the product life cycle by integrating the functional and environmental aspects.     

An adaptive image steganographic scheme based on Noise Visibility Function and an optimal chaotic based encryption method

Steganography is the science of hiding secret message in an appropriate digital multimedia in such a way that the existence of the embedded message should be invisible to anyone apart from the sender or the intended recipient. This paper presents an irreversible scheme for hiding a secret image in the cover image that is able to improve both the visual quality and the security of the stego-image while still providing a large embedding capacity. This is achieved by a hybrid steganography scheme incorporates Noise Visibility Function (NVF) and an optimal chaotic based encryption scheme. In the embedding process, first to reduce the image distortion and to increase the embedding capacity, the payload of each region of the cover image is determined dynamically according to NVF. NVF analyzes the local image properties to identify the complex areas where more secret bits should be embedded. This ensures to maintain a high visual quality of the stego-image as well as a large embedding capacity. Second, the security of the secret image is brought about by an optimal chaotic based encryption scheme to transform the secret image into an encrypted image. Third, the optimal chaotic based encryption scheme is achieved by using a hybrid optimization of Particle Swarm Optimization (PSO) and Genetic Algorithm (GA) which is allowing us to find an optimal secret key. The optimal secret key is able to encrypt the secret image so as the rate of changes after embedding process be decreased which results in increasing the quality of the stego-image. In the extracting process, the secret image can be extracted from the stego-image losslessly without referring to the original cover image. The experimental results confirm that the proposed scheme not only has the ability to achieve a good trade-off between the payload and the stego-image quality, but also can resist against the statistics and image processing attacks.     

Adaptive control for switched uncertain nonlinear systems with time‐varying output constraint and input saturation

This paper is concerned with adaptive tracking control for switched uncertain nonlinear systems, which contain the time‐varying output constraint (TVOC) and input asymmetric saturation characteristic. In response to the unknown functions, the fuzzy logic systems are adopted. The controller is constructed by the backstepping technique. Based on the Tangent Barrier Lyapunov Function (BLF‐Tan), an adaptive switched control scheme is designed. It is demonstrated that all signals in the resulted system are semiglobally uniformly ultimately bounded with TVOC under arbitrary switchings. Furthermore, the effectiveness of presented control method is validated via the simulation example.     

Engineering knowledge formalization and proposition for informatics development towards a CAD-integrated DfX system for product design

Target design methodologies (DfX) were developed to cope with specific engineering design issues such as cost-effectiveness, manufacturability, assemblability, maintainability, among others. However, DfX methodologies are undergoing the lack of real integration with 3D CAD systems. Their principles are currently applied downstream of the 3D modelling by following the well-known rules available from the literature and engineers’ know-how (tacit internal knowledge).This paper provides a method to formalize complex DfX engineering knowledge into explicit knowledge that can be reused for Advanced Engineering Informatics to aid designers and engineers in developing mechanical products. This research work wants to define a general method (ontology) able to couple DfX design guidelines (engineering knowledge) with geometrical product features of a product 3D model (engineering parametric data). A common layer for all DfX methods (horizontal) and dedicated layers for each DfX method (vertical) allow creating the suitable ontology for the systematic collection of the DfX rules considering each target. Moreover, the proposed framework is the first step for developing (future work) a software tool to assist engineers and designers during product development (3D CAD modelling).A design for assembly (DfA) case study shows how to collect assembly rules in the given framework. It demonstrates the applicability of the CAD-integrated DfX system in the mechanical design of a jig-crane. Several benefits are recognized: (i) systematic collection of DfA rules for informatics development, (ii) identification of assembly issues in the product development process, and (iii) reduction of effort and time during the design review.     

运输类飞机全机操纵系统功能检查试验技术研究及应用

运输类飞机驾驶舱位于机头内部,常规的试验加载设备难以固定,在全机操纵系统功能检查试验中如何准确地模拟飞行员对机械操纵装置加载成为该类试验亟待解决的问题。为了达到考核飞机结构静强度的同时实现舵面的功能检查,提出一种全新的全机静力试验舵面功能检查试验技术。通过驾驶盘双向大转角加载技术、基于响应的载荷谱自动切换技术及多向转角实时监测技术等模拟飞行员操纵过程及舵面受载情况,获得操纵力曲线及舵面响应曲线,成功解决了试验中的加载、控制及测量问题。最后以大型灭火/水上救援水陆两栖飞机操纵系统功能检查试验为研究对象,采用新方法顺利完成了试验,因此该方法满足试验要求。     

国家考古遗址公园发展十年回顾与实践思考

国家考古遗址公园作为大遗址保 护的有效手段和方式,已走过了十年的探索 与发展历程。本文通过不同种类公园的差 异比较,解析国家考古遗址公园的功能定 位;通过梳理103处国家考古遗址公园（含 立项）,分析其价值代表性、遗产完整性和 国家示范性等3个基本特点;其后,对国家考 古遗址公园规划与建设实践中存在的建设时 序、遗址复建、景观塑造、居民搬迁,以及 价值阐释与展示中的阐释与展示关系、遗址 博物馆展示等6方面问题展开讨论;最后, 提出国家考古遗址公园目前发展趋势中的几 个问题应引起足够重视,分别是重手段,轻 研究;重建设,轻体验;重迎合,轻引导。     

移动定位大数据支持建成环境规划设计的途径和方法

移动定位大数据包括手机信令数 据、移动互联网LBS数据等类型,是表示个 体活动时空特征的轨迹数据。在移动定位 大数据中依据轨迹点的时空特征规律能识 别出个体活动的居住、工作、游憩等特征 点,计算上述活动的空间分布特征,进而获 得居住、工作、游憩等功能之间联系的流向 和流量特征,获得传统数据无法反映的城 市功能空间分布以及城市功能联系的时空 特征。由此,移动定位大数据支持建成环境 规划设计有密度出发和联系出发两种应用途 径。联系出发的途径能支持区域城市关联、 职住空间关系、城市中心体系、设施服务水 平等方向;密度出发的应用途径能支持城 市人口规模、街道活力分析等方向。移动定 位大数据测算居民活动特征还只是一种推 测,在应用方法上要避免“黑箱”方式,对移 动定位大数据测算结果一定要结合传统数 据进行校核,提高可靠性。     

区域空间规划生态分级保护研究 ——以华蓥山东麓为例

生态分级保护是空间规划中重要支 撑性内容,是全面协调生态保护与开发利用 关系,实现各类空间差异化管控,促进区域 可持续发展的重要途径。本文以华蓥山东麓 为例,通过生态功能重要性和生态敏感性评 价,同时结合景观生态安全格局进行分析, 构建生态保护分级指数模型,按保护程度由 高至低将研究区划分为Ⅰ、Ⅱ、Ⅲ、Ⅳ级。其 中,I级保护区为基本生态控制区,实行严格 的生态保护制度;II级保护区为生态缓冲区, 实行生态修复与城乡建设、产业发展负面清 单管理制度;III级保护区为农业生态区,加 强农业生态环境保护,建立健全绿色生态农 业导向机制;IV级保护区主要为城镇村庄生 态区,加强城乡居民点环境保护,推进人居 环境建设。研究结果可为华蓥山东麓生态修 复保护总体规划提供借鉴,对华蓥山自然保 护区与城镇建设区之间生态过渡地带的精细 化、精准化、差别化管理具有重要意义。     

功能与符号——《全唐诗》北窗析

利用网上可检索数据库，可以方便地调阅《全唐诗》中所有涉及“窗的朝向”的诗句．并从对诗作的集中分析中推知唐代住宅及日常起居行为的信息。以此为研究范围，该文重点探讨“北窗”在唐人笔下和生活中受推崇的缘由，并就北窗的实用功能与符号意义两方面进行辨析。