Improved edge lightweight YOLOv4 and its application in on-site power system work

A“cloud-edge-end”collaborative system architecture is adopted for real-time security management of power system on-site work,and mobile edge computing equipment utilizes lightweight intelligent recognition algorithms for on-site risk assessment and alert.Owing to its lightweight and fast speed,YOLOv4-Tiny is often deployed on edge computing equipment for real-time video stream detection;however,its accuracy is relatively low.This study proposes an improved YOLOv4-Tiny algorithm based on attention mechanism and optimized training methods,achieving higher accuracy without compromising the speed.Specifically,a convolution block attention module branch is added to the backbone network to enhance the feature extraction capability and an efficient channel attention mechanism is added in the neck network to improve feature utilization.Moreover,three optimized training methods:transfer learning,mosaic data augmentation,and label smoothing are used to improve the training effect of this improved algorithm.Finally,an edge computing equipment experimental platform equipped with an NVIDIA Jetson Xavier NX chip is established and the newly developed algorithm is tested on it.According to the results,the speed of the improved YOLOv4-Tiny algorithm in detecting on-site dress code compliance datasets is 17.25 FPS,and the mean average precision(mAP)is increased from 70.89%to 85.03%.

Nonequilibrium work equalities in isolated quantum systems

We briefly introduce the quantum Jarzynski and Bochkov-Kuzovlev equalities .in isolated quantum Hamiltonian sys- tems, including their origin, their derivations using a quantum Feynman-Kac formula, the quantum Crooks equality, the evolution equations governing the characteristic functions of the probability density functions for the quantum work, and recent experimental verifications. Some resultsare given here for the first time. We particularly emphasize the formally structural consistence between these quantum equalities and their classical counterparts, which are useful for understanding the existing equalities and pursuing new fluctuation relations in other complex quantum systems.

Assessment of Multiple Working Condition System Reliability with Agent-Based Simulation Method

The mission reliability assessment plays a great role in logistics planning and supporting resource optimization of complex system.But the current problem,which is difficult to solve,is how to model and analyze the characters of system reliability under the complex mission profile.In order to solve the problem,an agentbased simulation method was used to assess reliability for complex systems with various random working conditions.A multi-working condition simulation agent(MA)was designed and used to simulate the random transferring process of working conditions of system,and it cooperated with system simulation agents(SAs)and unit simulation agents(UAs)to realize system mission reliability(MR)simulation.Through simulation experiments,effect of multiple working conditions mission on the reliability of system was analyzed by comparing with the basic reliability condition.Feasibility and efficiency of the method were proved through simulation experiments of the case system.The research result provides a viable and useful method and a solution for MR analysis and assessment of complex systems in multi-working conditions,which can help to evaluate the reliability of operating system orienting to the practical mission and environment,and it is meaningful for the reliability analysis and the design of complex systems.

Disease, Death and <i>Dhandha: Gharwali’s</i>Perspectives on the Impact of AIDS on <i>Devadasi</i>System and the Sex Work in South India

Traditional Devadasi system based sex work (dhandha) is practiced inIndia. The communities that practice this system are affected severely by AIDS epidemic. Through this paper we present the views of gharwalis (brothel madams) regarding the impact of AIDS on the traditional system (Devadasi system) of initiating girls as sex workers (Devadasis) and on the practice of sex work (dhandha) associated with that system. Qualitative in-depth interviews were conducted with twelve gharwalis as a follow-up of a cohort study, which investigated the patterns and determinants of sex worker migration from northern Karnataka to southern Maharashtra, in India. According to gharwalis, the disease (AIDS) consequences;death, fear and stigma affected dhandha operations, changed the attitude of the Devadasi community against the practice of dhandha and the Devadasi system, besides, influenced the community to take actions to stop the practice of dhandha and the Devadasi system. The findings suggest that the interplay between the disease consequences and the community’s response to those consequences contribute to transition dhandha and the Devadasi system. We discuss our findings, describe the transition and the consequent risk enhancing conditions. Finally, highlight the need to address these conditions to reduce Devadasis risk and vulnerability to HIV infection.

Effects of Spherical Light-weight Aggregates Additions on Workability and Mechanical Properties of Al_2O_3-SiO_2 System Castables

In order to clarify the effect of spherical light-weight aggregates addition on properties of A12 07 - Si02 system castables, adopting ATO mullite traditional light-weight aggregates and ATO mullite spherical light-weight aggre- gates, bauxite homogenization powder, microsilica , cal- cium aluminate cement as main raw materials, light- weight Al2 03 - SiO2 system castables were prepared by replacing conventional light-weight aggregate with spherical light-weight aggregates. The effects of spheri- cal light-weight aggregates addition on workability, me- chanical properties of castables after heated at different temperatures were researched; the microstructure of the aggregates was analyzed by SEM. The result shows that the introduction of spherical light-weight aggregates can significantly improve the flowability and reduce the water addition of the castables. Water demand of the castable is reduced from 18% with the conventional light-weight aggregates to 14% with spherical light-weight aggre- gates. In addition, light-weight castables prepared by spherical aggregates can keep the same workability with- in a wider range of water addition. Therefore, spherical aggregates are user-friendly. The introduction of spheri- cal light-weight aggregates is favorable to packing densi- ty and mechanical properties of castables, such as cold crushing strength, cold modulus of rupture, hot modulus of rupture at 1 200℃.

Dynamic Simulation of Solid Adsorption Solar Refrigerator System with AC/CH₃OH as a Working Pair

Solid adsorption system, one of alternative refrigeration systems, is utilized to provide cold for refrigerator or air-conditioner and can be operated by assistance of solar heat. System performance study through computer usage to develop simulation program and simulate behaviors of system operation can give designed system which suits for user’s need. Also, the present study aims to develop dynamic simulation program of solid adsorption refrigeration system operated by solar assistance to simulate behaviors of system operation and its performance. Flat plate collectror is utilized to provide thermal energy for system’s adsorber and activated carbon/methanol is used to be a suitable working pair. Simulation procedure starts with various solar radiation intensities as input energy on solar collector and water is used as collector working fluid. Behavior of system operation can be considered to be 4 steps as isosteric heating, isobaric desorption, isosteric cooling and isobaric adsorption, respectively. This research studies the effect of varying solar radiation intensity on temperature, pressure of adsorber, adsorption ratio at each steps of system operated ranging from 6:00 am (the first day) to 6:00 am (the next day) and system performance which is defined as coefficient of performance, COP. In addition, the simulation result shows monthly average COP of 0.43 compared to a result of another previous research work under the same operating condition and the percentage error is 7.5%.

Constructing Index System for Evaluating Work Level in Rural Endowment Insurance

This paper used fuzzy math principles, analyzed different aspects of the work of the current rural endowment insurance and formed the indices to assess the work level of the rural endowment insurance. After selecting the indices of the work level scientificly, constructed the index system to evaluate the work level of the rural endowment insurance and the index system was expressed in the form of math equation. In this way, an objective standard used to evaluate the work level of rural endowment insurance was establised.

Adaptive coupled synchronization of non-autonomous systems in ring networks

The adaptive coupled synchronization method for non-autonomous systems is proposed. This method can avoid estimating the value of coupling coefficient. Under the uniform Lipschitz assumption, we derive the asymptotical synchronization for a general coupling ring network with N identical non-autonomous systems~ even when N is large enough. Strict theoretical proofs are given. Numerical simulations illustrate the effectiveness of the present method.

Social Work Involved in Targted Poverty Alleviation: From Individual Aid to System Change

The development of social work is to some extent a history of the struggle against poverty. Social work enabled targeted poverty alleviation aims to form a two–way force to implement targeted poverty alleviation policies in a bid to create a new situation featuring top–down policy guidance and bottom–up social engagement. Social work enabled targeted poverty alleviation addresses the bureaucratic defects of government dominance, upgrades the narrow conception of targeted poverty alleviation as individual aid, and pays more attention to the interactions between the poor and environmental elements and the interactions within and between systems from the perspective of eco–system. In practice, this type of poverty alleviation is manifested as social work driven integral specialized poverty alleviation. By organically combining the four systems of subjects, service objects, work processes and implementation results, it advances current targeted poverty alleviation from the mid–shallow level to the deep level. It is expected to fulfill the intrinsic policy objectives of targeted poverty alleviation and explore a supporting system for realizing the modernization of national governance system and capacity in rural areas.

A Review on Technologies for the Use of CO2 as a Working Fluid in Refrigeration and Power Cycles

The use of carbon dioxide as a working fluid has been the subject of extensive studies in recent years, particularly in the field of refrigeration where it is at the heart of research to replace CFC and HCFC. Its thermodynamic properties make it a fluid of choice in the efficient use of energy at low and medium temperatures in engine cycles. However, the performance of transcritical CO2 cycles weakens under high temperature and pressure conditions, especially in refrigeration systems;On the other hand, this disadvantage becomes rather interesting in engine cycles where CO2 can be used as an alternative to the organic working fluid in small and medium-sized electrical systems for low quality or waste heat sources. In order to improve the performance of systems operating with CO2 in the field of refrigeration and electricity production, research has made it possible to develop several concepts, of which this article deals with a review of the state of the art, followed by analyzes in-depth and critical of the various developments to the most recent modifications in these fields. Detailed discussions on the performance and technical characteristics of the different evolutions are also highlighted as well as the factors affecting the overall performance of the systems studied. Finally, perspectives on the future development of the use of CO2 in these different cycles are presented.

Robot Position Control Using Force Information for Cooperative Work in Remote Robot Systems with Force Feedback

This paper proposes robot position control using force information for cooperative work between two remote robot systems with force feedback in each of which a user operates a remote robot by using a haptic interface device while observing work of the robot with a video camera. We also investigate the effect of the proposed control by experiment. As cooperative work, we deal with work in which two robots carry an object together. The robot position control using force information finely adjusts the position of the robot arm to reduce the force applied to the object. Thus, the purpose of the control is to avoid large force so that the object is not broken. In our experiment, we make a comparison among the following three cases in order to clarify how to carry out the control effectively. In the first case, the two robots are operated manually by a user with his/her both hands. In the second case, one robot is operated manually by a user, and the other robot is moved automatically under the proposed control. In the last case, the object is carried directly by a human instead of the robot which is operated by the user in the second case. As a result, experimental results demonstrate that the control can help each system operated manually by the user to carry the object smoothly.

基于SolidWorks二次开发的三维实时运动仿真方法

针对机器人三维实时运动仿真常用方法中不能与控制系统开发平台相融合、缺乏算法支持的问题,以用于检测压力容器的检测机器人为研究对象,设计出针对该机器人的三维实时控制系统软件。此软件将控制系统与三维实时仿真平台相融合,不仅能够远程对检测机器人生成并下达控制指令,而且利用Visual C#软件对Solid Works软件二次开发后形成的三维实时仿真平台,对机器人的运动状态进行实时仿真。现场使用结果表明,使用此软件能够安全可靠地对压力容器进行检测,三维实时仿真平台能有效提高仿真的精确度,实现对检测机器人运动状态进行全方位观测。

LonWorks在电除尘器实验系统中的应用

本文论述了 L onworks现场总线在火电厂电除尘器实验系统中的应用。该系统以研究电除尘器稳态工作的条件为目的 ,要求完成对现场所有设备的监控、以及对现场所有数据的处理等功能。由于 L on Works的应用 ,满足了该实验系统的稳定性、开放性的要求 。

基于SolidWorks的胶管钢丝编织机主传动系统分析

通过构建钢丝编织机主传动系统的的虚拟仿真系统,提高胶管钢丝编织机主传动系统的设计效率。基于SolidWorks平台,建立钢丝编织机主传动系统的三维模型,通过Motion进行运动仿真,获取齿轮的转速曲线,并通过Simulation进行有限元分析,得到钢丝编织机的运动特性,从而优化主传动系统。

Lon Works技术在智能小区安防系统中的应用

介绍了一种基于Lon Works技术的智能小区安防系统的主要功能、硬件组成及软件编程,实践证明,该系统具有适应性强、组态灵活、报警准确的特点。

基于Klocwork的C/C++软件静态检查

为了保证基于Linux与Vx Works操作系统的C/C++软件代码的质量,需要对软件源代码进行Klocwork检查。分别以SVN与Clear Case作为配置管理工具,将Klocwork工具分别在不同的操作系统下完成安装与配置之后,对C/C++源代码进行Klocwork检查。介绍了Linux环境下配置管理工具SVN客户端安装、SVN版本库的代码更新、Klocwork工具的安装与配置、Clear Case版本库的代码更新、以及Klocwork分别在Linux与Vx Works操作系统下进行Klocwork检查的步骤。给出了Klocwork检查分别在Linux与Vx Works操作系统中的详细检查步骤与检查脚本,以及对已经被检查出来的缺陷的处理。典型案例表明,Klocwork检查有助于及时发现并解决C/C++软件源代码的各种缺陷,从而提高软件质量和安全性。

利用Solid works软件进行液压集成块的设计

本文介绍了利用solid works软件设计液压集成块的方法,通过实例详细说明了液压集成块的设计过程。采用solid works设计液压集成块可以节约开发时间,减少错误。

空调控制系统CAN与Lon Works总线应用探究

文章对目前空调控制系统中的CAN和Lon Works现场总线技术的协议标准、数据结构、通信模式及应用特性等进行了比较分析,并根据其各自特点,提出在空调系统中混合构建控制系统的方法。

基于JAVA及Solid Works的装备液压系统零件库开发实践

阐述了在Solid Works平台中完成装备液压系统原始虚拟样机的建立,以SQL Server 2000作为系统后台数据库、应用成熟的JA-VA技术完成对系统零件库的各种网络应用功能,从而开发一个具有扩展功能的实用化网络装备液压系统零件库。