Michael W. Riley

The Effects of Handle Shape and Size on Exerted Forces

This research empirically evaluated the effects of handle shape and size on the hands ability to resist or exert force in six directions. Thirty-six handles of four sizes and nine shapes were tested for maximum force exertion by male and female subjects. The results show that subjects were able to generate higher forces with different sizes and shapes of handles, depending upon the direction of force exertion. This suggests that handles that are associated with high forces on particular directional tests are probably suited for tasks that incorporate that particular type of force or movement; they may not be appropriate for other tasks that do not incorporate such movement.

An Investigation of Preferred Shapes for Warning Labels

An examination was made of 19 different geometric shapes of warning labels, using the method of paired comparisons. Sixty-six college students viewed slides of all pairs of the shapes and each time selected the shape that was the preferred indicator of warning. An ordinal scaling method was used to evaluate the differences among the shapes. Results show that the triangle on its vertex was the preferred warning indicator among the shapes tested.

A comparison study of customer satisfaction between the UPS and FedEx: An empirical study among university customers

Purpose – The purpose of this research is to provide a comparison of customer satisfaction of two largest US parcel delivery companies, the UPS and FedEx.Design/methodology/approach – The paper is contrast the overall customer satisfaction and five critical factors (availability, responsiveness, reliability, completeness, and professionalism of service) that directly affect customer satisfaction for these two parcel delivery companies. Written questionnaire responses from university departments/units in the USA were collected and used for the comparison analysis. An independent samples t‐test was used to compare the ratings of customer satisfaction of these two parcel companies.Findings – The paper finds no significant differences in the ratings of service quality of that these two parcel delivery companies provide with respect to both incoming and outgoing mail. The results of this research suggest that the similarity in ratings of service quality of these two companies explain their equally dominant po...

An Analysis of Grasp Force Degradation with Commercially Available Gloves

Excessive force has been indicated as a causal factor in repetitive motion related occupational diseases such as carpal tunnel syndrome, tendinitis, and tenosynovitis. When gloves are worn, grasp capabilities may be compromised causing more force to be exerted. The objective of this research was to evaluate several brands and styles of gloves. Specifically, this evaluation determined the degradation of maximum grasping force for each of the gloves tested versus a bare-handed grasp. The results of this study indicate how much each glove inhibits grasp and a hierarchy of gloves is formed using the percentage of grasp degradation for each glove when it is compared with a bare-handed grasp.

Dexterity Performance and Reduced Ambient Temperature

This study examined the dexterity performance of 35 male and 35 female subjects at ambient temperatures of 1.7°C, 12.8°C, and 23.9°C. Subjects wore typical industrial worker apparel without gloves. The Purdue Pegboard, two pencil-point tapping tasks, an assembly task, and a fine manipulative task were used to measure the dexterity performance. Results indicate that after approximately 15 min of exposure there was no difference between performance at 12.8°C and 23.9°C, but there was a difference between performance at 1.7°C and 12.8°C as well as between performance at 1.7°C and 23.9°C. The decrement in performance at 1.7°C ranged from 0.3 to 15.7% when compared with performance at 23.9°C . In five of the 11 performance scores used, a difference due to gender was seen, with the males performing better on an assembly task and the females performing better on single-activity, repetitive tasks. At the higher ambient temperatures (12.8°C and 23.9°C), the average of the minimum finger skin temperature for males was from 0.57°C to 1.2°C higher than for females, whereas at 1.7°C there was no significant difference between the groups for minimum finger skin temperature.

Seating comfort and its relationship to spinal profile: A pilot study

Abstract Chair comfort is a subjective rating, comprising many factors which can be conceptually modelled. It was postulated that the overall comfort perceived by chair users is a function of the relative discomfort in various regions of the body and that the discomfort perceived in the lumbar region is a function of the spinal curvature. The results of two experiments are reported here. In the first experiment, five typical office chairs were evaluated in a field experiment using five subjects. The evaluation procedure used a general comfort rating scale, a body part discomfort rating scale, and a chair feature evaluation checklist. The results showed the body part discomfort ratings of the back regions to be critical in chair comfort. In the second experiment, three chairs were evaluated employing six subjects. The spinal posture of each subject was measured with a METRECOM ® digitizer while standing and seated in each chair type. The results indicate that the backrest curvature, and the thigh-trunk angle (included angle between the seat pan and the back rest) are critical for the overall chair comfort. The implications for the chair designer are discussed.

An Evaluation of Knife Handle Guarding

This research evaluated two variables affecting the performance of tang guards in preventing injury due to the hand slipping forward on a knife handle: the radius of transition from the handle to the blocking portion of the tang and the height of the tang. For the radii evaluated, there was no effect for either men or women. The guard height, however, did have a significant effect for both genders. There is a height, different for men and women, that appears to be critical. Guard heights exceeding this critical height do not enhance the capability of the guard to prevent the hand from slipping. Guard heights less than this critical value are less capable of preventing slipping.

Case Study: The Engineering Economics of RFID in Specialized Manufacturing

Calibrated tools are essential to producing highly specialized, defect-free parts. These tools are used in many processes in specialty manufacturing operations. Personnel could use the improper tool if the calibrated tool has been lost or stolen. This results in reduced business productivity and increased cost due to poor quality. This study demonstrates the cost effectiveness of using a radio frequency identification (RFID) system to track calibrated tools throughout a production facility. The costs of RFID tool tracking are described and return on investments of plausible scenarios are determined. Also, sensitivity analysis is performed utilizing spider plot and tornado diagrams.

Wrist squareness and median nerve impairment.

Previous research indicated that a wrist-squareness ratio (thickness/width) greater than .7 is likely to indicate a median nerve sensory latency greater than 3.7 ms, usually a predictor of carpal tunnel syndrome (CTS). In this study, wrist thicknesses and widths were measured and wrist-squareness ratios were calculated for a sample of 417 railroad maintenance workers. Electrodiagnostic testing, in accordance with American Academy of Electrodiagnostics Medicine guidelines, was performed on both motor and sensory fibers of the median nerve to evaluate subjects for the presence of median nerve impairment typical of CTS. Results of this study indicate that wrist squareness is not a useful predictor of median nerve impairment typical of CTS in the railroad maintenance workers tested.

Assessing customer satisfaction in parcel delivery industry: an empirical study among university customers

Parcel delivery companies (e.g. US Postal Service, UPS, and FedEx) are significant parts of modern transportation systems. The availability, responsiveness, reliability, completeness, and professionalism of service were identified from a literature review, as the five critical factors affecting customer satisfaction in parcel delivery industry. A model of customer satisfaction in parcel delivery service was developed. Academic departments from selected universities across the US responded to written questionnaires and these data were used for the study. The data included information on the characteristics of each above-mentioned factor and ranking of importance of the factors was determined. The research tested the hypotheses to determine the correlation coefficients between the five factors and overall customer satisfaction with respect to all customers for both outgoing and incoming parcel delivery services.