肢残者作业能力数字化评价方法及应用研究
详细信息    本馆镜像全文|  推荐本文 |  |   获取CNKI官网全文
摘要
依照残疾人剩余作业能力安置残疾人就业,分层次、分类别设计无障碍作业系统是有效利用残疾人资源的关键。残疾人的作业能力评价是解决残疾人工作设计的理论及技术基础。残疾人作业能力评价是功能医学、社会认知以及行为能力的多维度问题,旨在预测残疾人从事特定作业的胜任度。单一的残疾度医学评价无法准确预测残疾人的作业胜任度,评价残疾人功能残损对作业能力的影响需要综合考虑残疾功能与作业内容。作业能力指标与作业内容的相关度是能力评价信度和效度的前提,对评价结果的复杂信息处理及分类显示是能力评价结果适用性的关键,需满足残疾人作业系统人因调适数字化设计的需求。
     本文以占目前我国就业比例最高的肢残作业者为研究对象,构建肢残者体力作业能力评价方法。基于数字人仿真技术,通过对肢残者在虚拟作业场景下动作姿态仿真,建立肢残者作业能力评价的虚拟工作模拟器。肢残者作业能力数字化评价模型以人体特征和作业参数为输入,输出肢残者作业能力的生物力学分析,并对肢残者作业进行多能力差值进行多维度显示,也为人因调适的决策提供定量信息。
     首先,针对作业能力评价指标的作业相关度的问题,以识别肢残者作业-能力差值为目标,提出了作业残疾度的概念模型。用作业残疾度来描述肢残者剩余作业能力完成特定作业的胜任度,用工作要求与功能残疾度的交集描述作业残疾度。提出四要素模型描述作业要求属性,建立功能残疾度的生理指标域,生成肢残者与作业系统四要素的交互模型,并以此构建作业残疾度的指标域。
     其次,基于作业残疾度的概念模型,建立作业残疾度的分解模型。用生物力学参量描述作业要求、作业者特征以及两者间的交互属性,生成作业残疾度的生物力学特征模型。提出一种残疾人动作分析方法,将作业分解到基本动素层,基于多维动作分析表,识别出作业残疾度的关键动素。采用定性定量相结合的方法,对作业残疾度的关键动素进行肌肉骨骼及时间两级指标的赋值,生成作业要求图谱。作业要求图谱为功能评定界定了多层次评价指标体系及方法;以作业要求图谱为功能评价的基准面,用凹凸模型描述了作业残疾度。
     然后,建立肢残者作业建模与仿真技术,对作业残疾度关键动素进行仿真,为肢残者作业残疾度分析提供可视化平台。基于Poser,提出了的肢残者人体建模及基于功能约束的运动姿态仿真方法,在JACK下实现肢残人体及运动姿态仿真,实现对肢残者身体结构、运动及生理机能缺陷的多级仿真。
     针对作业残疾度指标的实验测量,以肢残者爬梯作业为例,设计肢残者爬梯实验,并获得手脚力量及手脚间距等关键部位的力学及运动学参数,作为特定作业者爬梯作业残疾度测量的结果。以膝下假肢者作为实验组,正常人作为对照组,对作业要求参数、人体特征下肢残者手脚力量、爬梯速度以及表面肌电信号的差异性分析和回归分析,构建肢残者爬梯任务模型,描述残疾因子对人体爬梯行为的影响。该模型可在已知任务要求和评价对象人体参数特征的条件下,直接计算用以表征残疾人爬梯作业残疾度的生物力学参数。
     最后,基于作业残疾度分解及肢残者作业仿真技术,提出作业残疾度数字化评价模型。以爬梯作业为例,对模型的使用进行了说明。基于实验测量的攀爬能力参数对肢残者爬梯姿态进行仿真,在JACK平台下实现作业姿态及作业残疾度的多维可视化分析,经与JACK生成的作业要求参数对比,实现作业残疾度的多维可视化分析。
It is critical for effective use of the disabled human resources to place and accommodate thehandicapped based on their residule work ability. Work ability evaluation of the handicapped provides basictools to the handicapped job design. The handicapped work ability evaluation is multi-dimensional issueincluding medical function evaluation, social cognition and behavior ability evaluation. It is to identify thework competency of the handicapped. However, medical evaluation itself cannot make accurate predictionsfor the work competency. To evaluate the influence of functional impairment on the work ability acomprehensive integration of work and phyisical function should be considered. The high relation of workability variables to the work content is the prerequisite for the reliability and validity of the work ablilityevaluation. It is equally important to deal with complexity of evaluation information. The results shall servethe ergonomic accommodation design of the work system.
     This thesis proposed a work ability evaluation model for the physically handicapped, who accounts forthe biggest employment percentage in the physical work field in China. Based on the digital humanmodeling and simulation, the thesis built up a virtual work sample simulation by simulate the motion of thephysically handicapped in the virtual environment. With the human and work characteristics as input, themodel output the biomechanical parameters of the work ability. The evaluation results can be shown inmulti-dimensions and provide multi-dimensional information for the ergonomic accommodation.
     It firstly proposed a conceptual model of work disability to descirbe the work-ability margin. Theinteraction of work requirement and functional disability was used to describe the work disability. AFour-factored model was applied to describe the work requirement while the funcitional disability wasdescribed by phyiscal variables. The interaction of the handicapped with the Four-factored model was usedto represent the work disablity.
     Then the thesis proposed an analytical model of work disability. The work requirement, workercharacteristics and their interaction are defined in the biomechanical dimension. It further established amotion analysis method specified for the handicapped. The motion analysis method defined the motionelement in3-dimensional chart and the key motion element was thus identified. The quantitative andqualitative integrated method was used to define the values of musculoskeleton and temporal parametersand the work requirement profile was thus formed. The work requirement profile defined a herachialevaluation system. A concave-convex model was established to describe the work disability with the workrequirement profile as the evaluation datum.
     The thesis then established a handicapped work modelling and simulation method tosimulate the key motion elements related to work disability, which provided a visual analysisplatform for the work disability of the physically handicapped. The body modeling wasrealized on Poser. A function-constrainted motion simulation method is applied to control themotion and posture by calculating the constraints by the physical, functional andphysiological disability.
     To build up experimental measurement of the work disability variables, the thesisdesigned a ladder climbing experiment to explain how the biomechanical parameters of subjects can be obtained. Further analysis were made on the foot/hand force, force/handseparation, climbing speed and EMG to build up a relational model of the disability on workability. A validated model can output the biomechanical parameters of the work ability withthe input of work and human characteristics parameters.
     Finally, a digitalized work disability evlauation model was proposed based on the workdisability analysis model and work simulation technique. Ladder climbing task was used toexplain the workability of the model. The measured parameters from the experiment wasinput into the work simulation model in JACK and then compared with the work requirementparameters from JACK. A multi-dimensioned evaluation result of work disability wasvisualized.
引文
[1]王莲屏.残疾人职业能力评估的内容与方法. Chinese Journal of Rehabilitation,2005,20:120-121
    [2] Matheson. L. Final Report: Functional assessment measures database. AmericanInstitues for Research, Washington, DC1999.
    [3] Matheson L. The functional capacity evaluation. Disability Evaluation.2nd EdSmith.G.. Chicago, IL: Mosby Yearbook,2003:43-85
    [4] Chen Jacob Jen-Gwo. A. Physical disablement concepts for physical therapy researchand practice. Physical Therapy,1994,74:380-386
    [5] Dior.R. Measuring the functional status of patients with low back pain. Archives ofPhysical Medicine and Rehabilitation,1988,69:1044-1053
    [6] Deyo R.A, Bombardier C, Cherkin DC, Keller RB, et al. Outcome measures forstudying patients with low back pain. Spine,1994,19:2032S-2036S
    [7] Isernhagen S, Matheson L. The role of functional capacity assessment afterrehabilitation. Ergonomics-The physiotherapist in the workplace, Bullock M. Ed.,London: Churchill-Livingstone,1990:43-65
    [8]邱卓英.《国际功能、残疾和健康分类》研究总论.中国康复理论与实践,2003,9:2-5
    [9]丁伯坦.肢体残疾评定中整体功能评价和ICF中“活动与参与”的关系.中国康复理论与实践,2004,10:24-29
    [10] S. V. Susanne, M. Bruyere, David Peterson. The international classification offunctioning, disability and health: contemporary literature overview. CovrzellUniversity,2005.
    [11]丁伯坦.肢体残疾分级和ICF中功能与结构的关系.中国康复理论与实践,2004,10:39-45
    [12]许健鹏.偏瘫康复的运动功能评价中值得注意的问题.中国康复理论与实践,2002,8:21-32
    [13]单大卯.人体下肢肌肉功能模型及其应用的研究.上海体育学院博士论文,2003
    [14]张爱民,鲁玉红,孙铁.世界卫生组织残疾评定项目及其与《国际功能、残疾和健康分类》的关系.中国康复理论与实践,2003,1:41-56
    [15]邱卓英.《国际功能、残疾和健康分类》研究总论.中国康复理论与实践,2003,1:42-49
    [16] Zhen. H, Chen. Jacob Jen-Gwo. Using analytic hierarchy process and fuzzy set theoryto rate and rank the disability. Fuzzy sets and systems,1997,88:78-90
    [17] Chen. Jacob Jen-Gwo, Min-Der Ko. The disability index analysis system via anergonomics, expert systems,and multiple attribute decision-making process.International Journal of Industrial Ergonomics,1994,2:317-335
    [18] Uniform guidelines on employee selection procedures. Federal Register,1993:212-239
    [19] Research plan for the National Center for Medical Rehabilitation Research. NationalInstitutes of Health, Washington, DC1993.
    [20] Leggett S. Quantitative assessment of full range-of-motion lumbar extension strength.Medicine Science Sports Exercise,1988,20:22-36
    [21] Hasten D, Johnston F. Lumbar range of motion in male heavy laborers on the appliedrehabilitation concepts (ARCON). Spine,1996,21:2230-2234
    [22] Hasten D, Lea R. Validity of the applied rehabilitation concepts (ARCON) system forlumbar range of motion. Spine,1995,20:1279-1283
    [23] N. Nattrass. Lumbar spine range of motion as a measure of physical and functionalimpairment: An investigation of validity. Clinical Rehabilitation,1999,13:211-218
    [24] Kathine. J, Evaluation of grip loss: A factor of permanent partial disability inCalifornia," Industrial Medicine Surgery,1957,26:285-289
    [25] Luck J. A brief history and comparative analysis of disability systems and impairmentrating guides. Orthopology Clinical North America,1988,19:839-844
    [26] Yoe.C. Schedule for rating permanent disabilities. State of California Department ofIndustrial Relations: Division of Workers' Compensation, Sacramento, California,1997.
    [27] A. M. Association. Guides to the evaluation of permanent impairment,1993
    [28] Malzahn DE, Marley R. J. Performance of severely disabled adults on simulatedassembly tasks. Advances in Industrial Ergonomics and Safety, London Taylor&Francis,1989:871-876.
    [29] Malzahn. D. A multivariate analysis of directional movement time. Trends inErgonomics Human Factors, Amsterdam,1988:59-765.
    [30] Dictionary of occupational titles,4th ed.,1991.
    [31] Hanson M, Borman W. The O*NET Occupational Information System. Handbook ofmeasurement and evaluation in rehabilitation.3rd Edition, New York: AspenPublishers,2001.281-309.
    [32] M. Rosinek. Skills Assessment Module (SAM.): A Unique&Practical Approach tothe Assessment Process. Cleveland, GA: Piney Mountain Press.
    [33] Chi C.F. A study on job placement for handicapped workers using job analysis data.International Journal of Industrial Ergonomics,1999,24:337-351
    [34] Brolin, D., Brolin, J. Disability evaluation. Vocational preparation of persons withhandicaps: Charles E. Merrill Publishing Company,1982:45-87
    [35] North, K, Rohmert,W. Job analysis applied to the special needs of the disabled.Ergonomics,1981,24:889-898,.
    [36] Bullock I.. Overseas observation of the physiotherapist in the workplace. AustrialianJournal of Physiotherapy,1986,32:45-56
    [37] Birkin R.. Can the activity matching ability system contribute to employmentassessment: an initial discussion of job performance and a survey of workpsychologists’ views. Journal of Occupational Psychology, Employment and Disability,2004,4:32-45
    [38] Watson H.. Occupational assessment: the activity matching ability system (AMAS).International Disability Studies,1987,9:43-56
    [39] Katon. P. Sourcebook of occupational rehabilitation. New York and London: PlenumPress,1998.
    [40] Gu Qin, Deng Zhigang. Compression of human motion capture data using motionpattern indexing. Computer Graphics,2009.28(01):1-12
    [41] Europe C. Assessing disability in Europe: similarities and differences report drawn upby the working group on the assessment of person-related criteria for allowances andpersonal assistance for people with disabilities,2002.
    [42] Bielecki G., Bruce G.. Validation of the valpar independent problem-solving worksample as a screening tool for brain damage. Vocational Evaluation&WorkAdjustment Bulletin,1984,17:59-61
    [43] Valpar Corporation. VALPAR Component Work Sample Manual: For B-Kit,1980.
    [44] Gilbreth F., Gilbreth L. Applied Motion Study. New York: The MacMillan Company,1917.
    [45] Krystin E., Mitchell E, Morfopoulos Richard. Toward an ADA-appropriate jobanalysis. Human Resource Management Review,1997,7:5-26.
    [46] Robinson JP, Fulton LD, Martin DC. Perceived efficacy of pain clinics in therehabilitation of injured workers. Clinical Journal of Pain,1998,14:202-208
    [47] Wehman P. and Kreutzer J. Return to work: critical issues in employment.Vocational Rehabilitation for Persons with Traumatic Brain Injury. Rockville,Maryland: Aspen Publishers,2000.437-562
    [48] R. Jennifer, M. Fletcher. The validation of the transition-to-work inventory: a jobplacement system for workers with severe disabilities " Journal of Developmental andPhysical Disabilities,1998,10:1-22
    [50] Wieland K., Schuette, M. Concept of ergonomic and systematic work design fordisabled workers. International Journal of Rehabilitation Research,1985,8:143-151
    [51] Chia Chia-Fen, Liua Tzu-Hsin, Jangb Yuh. The development of a hierarchical codingscheme and database of jobaccommodation for disabled workers. International Journalof Industrial Ergonomics,2004,33:429-447
    [52] Field WE. Disability in agriculture. Agricultural Medicine: A Practical Guide, L.Ed.,New York: Springer,2006.
    [53] Bragman J.C. Job Match: A process for interviewing and hiring qualified handicappedindividuals. American Society for Personnel Administration, Alexandria, VA,1984.
    [54] Lopez F.M.. An empirical test of a trait-oriented job analysis technique. PersonnelPsychology,1981,34:479-502
    [55] Brannick M. T., Brannick J. P.,&Levine E. L.. Job analysis, personnel selection,andthe ADA. Human Resources Management Review,1992,2:171-182
    [56] Armstong T. J. Designing jobs for handicapped employees. The Job AnalysisHandbook for Business, Industry, and Government, S. Gael, White Plains, NY: JohnWiley and Sons,1988.
    [57] S. Meulen. RAMSIS-The leading CAD tool for ergonomic analysis of vehicles. in:Digital Human Modeling, HCII Conference Proceedings, Beijing, Springer,2007:1008–1017.
    [58]王兆其.虚拟人合成研究综述.中国科学院研究生院学报,2000,17:89-98
    [59] M. Khachani, Rahman and Loeb, Gerald E. MSMS human modeling. CAD FEMMedical,2009:54-67
    [60] Rasmussen O and Metin J. AnyBody–ANSYS Interface: CAE Technology for theHuman Body. CAD FEM Medical,2007:43-67
    [61] Delp S. L. OpenSim: open-source software to create and analyze dynamic simulationsof movement. IEEE Transactions on Biomedical Engineering,2007,54:1940-1950
    [62] Veloso A. Biomechanics modeling of human musculoskeletal system using adamsmultibody dynamics package. Faculty of Human Movement Sciences. TechnicalUniversity of Lisbon,2004.
    [63] McHenry B. G.. Head Injury Criterion and the ATB. McHenry Software,2009.
    [64] GATB. Available: http://wgrimes.qwestoffice.net/gatb.html
    [65] Lupker H. A. Advances in the Madymo Crash Simulations. International Congress&Exposition,1991.
    [66] D.Biomechanics.Availablehttp://www.bostondynamics.com/content/sec.php?section=digibio,2008http://www.bostondynamics.com/diguy/index.htm,2008
    [68] Stephens G.. The truck that Jack built: digital human models and their role in thedesign of work cells and product design. Digital Human Modeling for Design andEngineering Conference,2006.
    [69] N. Delleman, Haslegrave, C., and Chaffin, D. Working Postures and Movements.Tools for Evaluation and Engineering. New York: CRC Press,2004.
    [70] Abdel-Malek K.. Towards a new generation of virtual humans. International Journal ofHuman Factors Modelling and Simulation,2006,1:24-39.
    [71] James B. Automatic joint parameter estimation from magnetic motion capture data.Graphics Interface,2000:1-8.
    [72] Victor H., Zordan B.. Tracking and Modifying Upper-body Human Motion Data withDynamic Simulation.Research Paper. University of Pittsburg,2008
    [73] Lee Jehee. Interactive Control of Avatars Animated with Human Motion Data.Research Paper. Penn State University,2008.
    [74] Li Jia. Markerless human motion capture by Markov random field and dynamic graphcuts with color constraints. Science in China Series F: Information Sciences,2009,52:252-259
    [75] Kyunggun Na. Hierarchical retargetting of fine facial motions. EuroGraphics,2004,23:677-695,.
    [76] Gleicher.M. Animation from observation: motion capture and motion editing.Computer Graphics,1999,33:51-54
    [77] Kovar Lucas, Schreiner John. Footskate cleanup for motion capture editing. ACMSiggraph Symposium on Computer Aniamtion, Las Vegas, CRC Press,2002:456-465
    [78] M. Gleicher. Motion Editing with Spacetime Constraints. Symposium on Interactive3D Graphics, San Diego, CRC Press,1997:486-498
    [79] Li Jia. Markerless human motion capture by Markov random field and dynamic graphcuts with color constraints. Science in China Series F: Information Sciences,2009,50:252-259.
    [80] Tomohiko Mukai, Toyohisa Kaneko. Motion generation of virtual human withhierarchical reinforcement learning. Electronics and Communications in Japan,2008,87:886-894
    [81] Miller. A. Computer Simulation Model of the Airborne Phase of Diving. PhD Thesisof Pennsylvania State University,1970.
    [82] Passerello H. Human attitude control. Journal of Biomechanics,1971,4(2):95-102
    [83] Hatze.A. Comprehensive model for human motion simulation and its application to
    [84] Zajac K. Muscle and tendon:properties, models, scaling, and application tobiomechanics and motor control. Critical Review of Biomechanical Engineering,1989,17:359-411
    [85] Delp Z. Surgery simulation: a computer graphics system to analyze and designmusculoskeletal reconstructions of the lower limb. PhD Thesis Stanford University,1990
    [86] Available: http://www.anybodytech.com/
    [87] Davoodi R., Loeb G.. Advanced modeling environment for developing and testing FEScontrol systems," Medical Engineering and Physics,2003,25:3-9,.
    [88] Johnson A.. Simplifying Hill-based muscle models through generalized,extensiblefuzzy heuristic implementation. Proceeding of SPIE,2007:1-15.
    [89]魏高峰.人体骨肌系统的整体生物力学建模与仿真分析研究-中国力学虚拟人系统集成方法与实现.上海交通大学博士论文,2010
    [90] Ettore. S.. Dynamic modeling of the human arm with video-based experimentalanalysis. multibody system dynamics,2002,7:389–406.
    [91] ElMenceur Ait. An experimental protocol to study the car ingress/egress movement forelderly and pathological population, Proceedings of the European Annual Conferenceon Human Decision Making and Manual Control, Valenciennes,2006:567-578
    [92] Chaffin Don B, Woolley Charles, Dickerson Clark,et.al. Modeling of object movementcapability in the spinal cord injured population. International Journal of IndustrialErgonomics,2004,33:229-236
    [93] K. Li, Duffy, Zheng, L. Universal accessibility assessments through virtual interactivedesign. International. Journal. of Human Factors Modelling and Simulation,2006,1:52-68
    [94] Simsa R HADRIAN: a virtual approach to design for all. Journal of EngineeringDesign,2010,21:253-273
    [95] Eilouti B. A digital incorporation of ergonomics into architectural design. InternationalJournal of Architectural Computing,2009,7:235-253
    [96] Lee Leng-Feng, Kannan Srikanth, Mendel Frank, et.al. Case studies ofmusculoskeletal-simulation-based rehabilitation program evaluation. IEEETransactions on Robotics,2009,25:634-638
    [97] Fleishman J. Combining activities of daily living with instrumental activities of dailyliving to measure functional disability. The Journals of Gerontology: Series B,1988:53B: S46-S57.
    [98]世界卫生组织.国际功能、残疾和健康分类.2001.
    [99] Taylor F. The Principles of Scientific Management. New York: W. W. Norton,1911.
    [100] Hammond R. W. The history and development of industrial engineering. IndustrialEngineering Handbook, Maynard, Ed., New York: McGraw-Hill,1971.
    [101] Gilbreth F. Motion Study: A Method for Increasing Efficiency of the Workman. NewYork: Van Nostrand,1911
    [102] Meister D. Human Factors: Theory and Practice. New York: John Wiley&Sons,1971
    [103] Meister R. Human Factors Evaluation in System Development. New York: John Wiley&Sons,1965
    [104] Salvendy G.. Handbook of Human Factors. New York: John Wiley&Sons,1987.
    [105] Sanders M.S., McCormick, E.J. Human Factors in Engineering and Design. New York:McGraw Hill,1987.
    [106] Woodson W. Human Factors Design Handbook. New York: McGraw-Hill,1981.
    [107] Tichauer E. R. The Biomechanical Basis of Ergonomics: Anatomy Applied to theDesign of Work Situations. New York: John Wiley&Sons,1978.
    [108] Taylor J. C.. Job Design Criteria: Twenty Years Later. Design of Jobs. Davis, J.C., EdNew York: John Wiley&Sons,1979:54-63.
    [109] Grandjean E.. Fitting the Task to the Man. London: Taylor&Francis,1980.
    [110] Karwowski W., Marrar, W.S. The Occupational Ergonomics Handbook. Boca Raton,FL: CRC Press,1999.
    [111] Genaidy A., Karwowski, W., Christensen, D. Principles of work system performanceoptimization: A business ergonomics approach. Human Factors and Ergonomics inManufacturing,1999,9:105-128
    [112] Karwowski W.. Occupational biomechanics. Handbook of Industrial Engineering, G.Salvendy, Ed., New York: John Wiley&Sons,1992:1005-1046.
    [113] Smith S.. A Balance Theory of job design for stress reduction. International Journal ofIndustrial Ergonomics,1989,4:67-79
    [114] Janh I. Functional capacity evaluation in work Injury: management and prevention,Gaitherburg,1988:139-191
    [115] Isernhagen J, Mateson LN. Reliability of independent observer judgements of level oflift effort in a kinesiophysical functional capacity evaluation.Work,1999,12:145-150.
    [116] Goldfried M.R. A behavioral-analysis model for assessing competence. Current Topicsin Clinical and Community Psychology, New York: Academic Press,1969:151-196.
    [117] Sundberg N.D. Toward assessment of personal cometence in life situations. AnnualReview of Psyschology,1978,29:179-221
    [118] Amstrong T. The functional capacity evaluation: measuring maximal work abilitiesSpine: State of Art Reviews,1993,5:43-53
    [119] Heal W. Response biases in interviews of individuals with limited mental ability.Journal of Intellectual Disability Research,1995,39:331-340.
    [120] Craig B., Velozo A. Measurement qualities of a self-report and therapist-scoredfunctional capacity instrument based on the Dictionary of Occupational Titles. Journalof Occupational Rehabilitation,2006,16:109-122
    [121] Matheson Leonard, Vert Mooney, Andrew Sarkin, et.al. A method to provide a moreefficient and reliable measure of self-report physical work capacity for patients withspinal pain. Journal Of Occupational Rehabilitation,2008,18:46-57
    [122] Spanjer Jerry, Brouwer Sandra, Popping Roel.Reliability and validity of the disabilityassessment structured interview (DASI): A tool for assessing functional limitations inclaimants. Journal of Occupational Rehabilitation,2010,20:33-40
    [123] Spieler E, Burton J, Himmelstein J, et.al. Recommendations to guide revision of theGuides to the Evaluation of Permanent Impairment. JAMA2000,283(4):519-23.
    [124] Dewer.R. Gait patterns during free choice ladder ascents. Human Movement Science,1983,2:187-195
    [125] Hewer.W. and Soe.U. Human behavior when climbing ladders with varyinginclinations. Safety Science,1992,15:89-96
    [126] Hewer. J. Workload of window cleaners using ladders differing in rung separation.Applied Ergonomics,2005,36:43-56
    [127] Dewar E. Body Movements in Climbing a Ladder. Ergonomics,1977,20:67-86
    [128] Chang Chien-Chi, Matz Simon. The effects of straight ladder setup and usage onground reaction forces and friction requirements during ascending and descending.Safety Science,2005,43:23-35
    [129] Chaffin D., Bloswick S. An Ergonomic analysis of the ladder climbing activity.International Journal of Industrial Ergonomics,1990,6:45-56
    [130] Amstrong T. Biomechanical aspects of fixed ladder climbing: style, ladder tilt andcarrying. Proceedings of the Human Factors and Ergonomics Society53rd AnnualMeeting,2009:56-67

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700