An investigation into four different sit–stand workstation use schedules

Twelve office workers participated in a study investigating effects of four sit/stand schedules (90-min sit/30-min stand, 80/40, 105/15, and 60/60) via several objective and subjective measures (muscle fatigue, foot swelling, spinal shrinkage, and self-reported discomfort). Results showed that there were no significant differences in shoulder and low back static muscle activities between sitting and standing. Muscle fatigue was developed during workday under all schedules. The longest standing schedule seemed to have a tendency of reducing muscle fatigue. None of the schedules helped or worsened foot swelling and spinal shrinkage. More active break-time activities seemed reducing muscle fatigue and foot swelling. While the self-reported bodily discomfort levels were generally low, the preferred schedules among the participants were varied, although the least standing schedule was the least preferred. We may conclude that effects of using sit–stand workstation to improve musculoskeletal health may be limited but promoting more active break-time activities can help.

Practitioner Summary: Sit–stand workstations are used to reduce work-related musculoskeletal disorders. This study shows that office workers prefer sit/stand durations in the range between 1:1 and 3:1. Longer standing may have the potential to reduce muscle fatigue. However, active break-time activities may be more effective in reducing muscle fatigue and foot swelling.     

解剖HP的ITANIUM2 workstation

HP的动作真快,INTEL刚发布“ITANIUM2(安腾2)”,HP的Workstation就出来了。看看真是漂亮！买一个回家吧！给菲佣做网上购物用！哈哈……     

HP workstation xw60003D动画设计的利器

英雄配宝马。对于一名从事3D动画制作的设计师来说,性能稳定、运行速度快捷的图形工作站无异是一匹宝马。上个月,公司为配合制作一批春节节目,又添置了几台HPWorkstationxw6000工作站。在朝夕相处的耳鬓厮磨中,我渐渐喜欢上了这个计算能力强大,且结构紧凑的工作伙伴。单是看其外观,就颇感不凡。HPWorkstationxw6000具有典型的Compaq工作站的风格,黑色与银灰镶嵌的机箱看起来高大沉稳,前面板提供了两个USB2.0接口并预留IEEE1394接口位,可以方便地升级为高端视频工作站。更令人感到贴心的是,它采用了微塔式外形,结构紧凑,小巧方便,仅占…     

HP workstation xw6000 3D动画设计的利器

英雄配宝马.对于一名从事3D动画制作的设计师来说,性能稳定、运行速度快捷的图形工作站无异是一匹宝马.上个月,公司为配合制作一批春节节目,又添置了几台HPworkstation xw6000工作站.在朝夕相处的耳鬓厮磨中,我渐渐喜欢上了这个计算能力强大,且结构紧凑的工作伙伴.……     

HP workstation xw6000 3D动画设计的利器

英雄配宝马.对于一名从事3D动画制作的设计师来说,性能稳定、运行速度快捷的图形工作站无异是一匹宝马.上个月,公司为配合制作一批春节节目,又添置了几台HPworkstation xw6000工作站.在朝夕相处的耳鬓厮磨中,我渐渐喜欢上了这个计算能力强大,且结构紧凑的工作伙伴.     

HP发布首款支持双核奔腾D工作站——HP workstation xw4300

近日,HP个人工作站家族又多了一位新成员———HP workstation xw4300。新推出的HP xw4300工作站可以配置最新的Intel单核处理器或双核处理器。其中,Intel奔腾D840双核处理器,工作频率为3·2 GHz;奔腾4单核处理器,工作频率为2·8~3·8 GHz,其不仅可以大幅提升多线程软件的性能,而且可满足计算机辅助设计(CAD)、视频编辑、数字内容制作(DCC)或者追求高性能计算的办公用户的应用需求。它还增添了许多通常只有在高档工作站和服务器平台上才能见到的强大功能。HP xw4300是一款PC机价位,却具有工作站级图形性能的工作站新品。HP xw4300…     

O2 Super workstation(DPS-4A/DPE-4A)--强氧科技最新工作站产品

为了胜任三维图形用户日益庞大的工作任务,北京强氧科技联合美国Supermicro公司共同推出了两款基于新型静音技术的三维图形工作站系统O2Super workstation(DPS-4A/DPE-4A)。 DPS-4A/DPE-4A使用了Intel最新发布的E7505芯片,支持双路采用Hyper-Threading技术的IntelXeon处理器,系统总线达到533MHz;系统采用了各大专业图形卡厂商推出的AGP 8X专业显卡,能充分发挥AGP 8X的优势,实现2GB/s的图形数据传递速度。系统详细特点如下:     

Can we simulate the biomechanical effects of exoskeletons prior to workstation implementation? Application of the Forces ergonomic method

Increasingly, exoskeletons are becoming a valuable tool for prevention technicians to promote occupational health and reduce the risk of musculoskeletal disorders in industry. However, the effective implementation of industrial exoskeletons is a complex challenge. Deciding whether these devices are the optimal solution to the detected ergonomic risks at a specific workstation is not straightforward. This study presents the modelling of three commercial passive exoskeletons, one for lumbar and two for shoulder risk reduction, to be considered in the musculoskeletal risk assessment of industrial workstations. The presented modelling considers the forces and moments applied by exoskeletons to the body using the Forces ergonomic method, providing the musculoskeletal risk for each joint based on inertial motion capture data registered at each workstation. This approach is exemplified on simulated and actual production workstations. The results reveal that the modelling application allows an objective understanding of the biomechanical effects of exoskeletons. Modelling establishes a predictive tool to assess and make decisions regarding the suitability of the exoskeleton prior to implementation at a workstation.     

数字创新提升中国产业升级——“HP workstation2008中国制造业产品创新数字化国际峰会”在南京召开

2008年11月27日,由e-works、江苏省制造业信息化示范工程管理办公室、中国惠普有限公司联合主办,安徽省制造业信息化培训中心、厦门市生产力促进中心、无锡市制造业信息化推进中心和镇江市生产力促进中心协办的"HP workstation 2008中国制造业产品创新数字化国际峰会"在南京召开。本届年会是在全球金融危机对中国制造业     

令人困惑的a=*a

“指向二维数组的指针和指针变量”是C语言程序设计中的难点,对于初学者来说有些概念难以理解,容易产生混淆;在实际编程时,也容易错误地加以应用。本人在教学实践中经过摸索发现,从容易理解的一维数组出发,循序渐进地学习与理解此部分内容,就会收到良好的学习效果。     

Optimizing a damped system – a case study

We consider a second-order damped-vibrational system described by the equation M ?+C(v) [xdot]+K x=0, where M, C(v), K are real, symmetric matrices of order n. We assume that the undamped eigenfrequencies (eigenvalues of (λ² M+K) x=0) ω₁, ω₂, …, ω _n , are multiple in the sense that ω₁=ω₂, ω₃=ω₄, …, ω _n?1=ω _n , or are given in close pairs ω₁ ≈ ω₂, ω₃ ≈ ω₄, …, ω _n?1 ≈ ω _n . We present a formula which gives the solution of the corresponding phase space Lyapunov equation, which then allows us to calculate the first and second derivatives of the trace of the solution, with no extra cost. It can serve for the efficient trace minimization.     

Is a Semantic Web Agent a Knowledge-Savvy Agent?

The issue of knowledge sharing has permeated the field of distributed AI and, in particular, its successor, multiagent systems. Through the years, many research and engineering efforts have tackled the problem of encoding and sharing knowledge without the need for a single, centralized knowledge base. The proposed solutions to this problem are based, more or less, on stringent assumptions, such as static, shared ontological models, or the existence of a common blackboard (or "Linda Space") environment where entities can share knowledge. However, the uptake of the World Wide Web and the emergence of modern computing paradigms, such as distributed, open systems, have highlighted the importance of sharing distributed and heterogeneous knowledge on a larger scale-possibly on the scale of the Internet.     

Implementing a Serializer Using a Java XML Schema API

W3C XML （Extensible Markup Language） Schema defines a set of abstract components, which carry the core semantics of document structure definition. There has been no standard API for accessing these components or their structures yet. The MARKUP Technology Company has specified a Java API for accessing XML Schema and submitted it to the W3C as a possible basis for standard Schema API. An overview of the schema API is provided and then XML schema serializer is implemented using this API in this paper.     

Assigning a kekulé structure to a conjugated molecule

The Edmonds Matching Algorithm, which leads easily to finding a perfect matching in a chemical graph, which is equivalent to a Kekulé structure in a conjugated molecule, is recalled. An extension is made to the case where only vertices of a specified set must be covered by edges of the matching which is sought.     

Implementing a feasibility study “a procedural approach”

The aim of the paper is to present a procedural approach for implementing a feasibility study. It consists of three chapters.The first is concerned with General Aspects and Proposals, and covers: the meaning and objectives of the feasibility study, the relations between long range planning and feasibility studies, proposals for initiating and conducting the feasibility study, and suggestions for using “prototyping” during the feasibility study.The second proposes a Feasibility Study Methodology, and finally The third gives the “format” for Presenting a Feasibility Study to Management.     

走进802.11a

在现在的工作(家庭)环境中,您是否感觉需要无线设备给我们提供更加便捷的网络连接了么?以往当我们提起网络连接设备,通常人们所想到的是网卡、集线器、交换机以及各种网络线缆。从     

Velocity planning for a mobile robot to track a moving target — a potential field approach

Potential field method has been widely used for mobile robot path planning, but mostly in a static environment where the target and the obstacles are stationary. The path planning result is normally the direction of the robot motion. In this paper, the potential field method is applied for both path and speed planning, or the velocity planning, for a mobile robot in a dynamic environment where the target and the obstacles are moving. The robot’s planned velocity is determined by relative velocities as well as relative positions among robot, obstacles and targets. The implementation factors such as maximum linear and angular speed of the robot are also considered. The proposed approach guarantees that the robot tracks the moving target while avoiding moving obstacles. Simulation studies are provided to verify the effectiveness of the proposed approach.     

Living in a bubble? Toward a unified bubble theory

We generalise the notion of a bubble beyond the financial domain, by showing how a single social mechanism, based on an information feedback-loop, explains both financial bubbles and other seemingly disparate social phenomena, such as the recognition of academic articles, website popularity, and the spread of rumours.

We discuss examples of phenomena explained by this bubble mechanism, as well as other phenomena that exhibit certain bubble characteristics, yet are not bubbles according to our model. Finally, we present mathematical mechanisms for two phenomena that conform with our model, and show by computer simulation how they exhibit bubble behaviour.     

Cobol: a historic past, a vital future?

One of the strangest stories in the software world centers around the programming language Cobol. Academics have reviled it for decades; its demise has been predicted since the 1960s; industry gurus have suggested that programmers who know only Cobol are committing career suicide. You would think, based on all this bad press, that Cobol was not long for this software world. Yet the giant lumbers on. In poll after poll, it is either the most-used or the second-most-used programming language in industry. In fact, in one industry poll, each year those contacted predict that Cobol's use will diminish by the next poll, and each year the findings are that Cobol is the only language whose use has actually increased. The devil refuses to die. What's with Cobol? I give my Loyal Opposition answer to that question and then give some input on the subject from a Cobol expert who is tracking Cobol's future directions