The effects of an intervention campaign to enhance seat belt use on campus.

The national health objectives for the year 2000 called for an increase in the use of safety restraints to 85% of motor vehicle occupants. An assessment on one campus indicated that only 79% of those observed were wearing seat belts. Nursing faculty and students undertook a multimodal intervention campaign to increase seat belt use in the campus community. Observed use of seat belts increased to 81% after the week-long intervention consisting of reminder banners, media coverage, permanent reminder signs, roll-over demonstrations, a presentation on the need for seat belt use, and distribution of seat belt use pledge cards. Although the increase was small, it was statistically significant and could represent considerable savings in healthcare costs if even 2% of the population could be saved from serious injury by using seat belts. In addition, the change in seat belt use represented a decline of nearly 10% in the number of nonusers.     

Aircraft seating comfort: the influence of seat pitch on passengers' well-being

One of the most important factors influencing aircraft seating comfort in economy class, is legroom. In an airline interior mock up, with the ability to adjust the seat pitch in a range of 28 inches to 43 inches, a study to investigate the influence of seat pitch on passengers' well-being was conducted. In a pre-study, aspects of subjective postural sensations and spatial perception were identified, and a questionnaire was developed. In the main study, 30 subjects rated at different seat pitch settings the spatial perception and the ability of adopting and changing sitting postures. As a result a functional relationship between overall well-being, the subjects' anthropometry and seat pitch was developed. Furthermore it was identified, that there is a maximum overall well-being at a seat pitch of 34 inches to 40 inches, depending on the passengers' anthropometry. A further enlargement of seat pitch, led to a reduction of well-being.     

Patterns of correlation between vehicle occupant seat pressure and anthropometry

Seat pressure is known as a major factor of seat comfort in vehicles. In passenger vehicles, there is lacking research into the seat comfort of rear seat occupants. As accurate seat pressure measurement requires significant effort, simulation of seat pressure is evolving as a preferred method. However, analytic methods are based on complex finite element modeling and therefore are time consuming and involve high investment. Based on accurate anthropometric measurements of 64 male subjects and outboard rear seat pressure measurements in three different passenger vehicles, this study investigates if a set of parameters derived from seat pressure mapping are sensitive enough to differentiate between different seats and whether they correlate with anthropometry in linear models. In addition to the pressure map analysis, H-Points were measured with a coordinate measurement system based on palpated body landmarks and the range of H-Point locations in the three seats is provided. It was found that for the cushion, cushion contact area and cushion front area/force could be modeled by subject anthropometry, while only seatback contact area could be modeled based on anthropometry for all three vehicles. Major differences were found between the vehicles for other parameters.     

A study of the kinematics of ingress and egress of upright and recumbent seats

Research has been done on the maximum reach and ingress/egress of upright seats. However, research on recumbent seats and comparisons between recumbent and upright seats is limited. By using an eight-camera Vicon motion capture system and C-motion Visual 3D modeling software, this research compared the ingress/egress joint kinematics and maximal planar reach of an upright seat with a recumbent seat. Mean range of motion and mean peak angle for each ingress/egress task were determined and the values for the upright seat were compared to the values for the recumbent seat. For each reach task, three extreme points were extracted and compared between the upright and recumbent seat. Seat orientation was found to have a statistically significant effect on the range of motion of several joints during the ingress/egress tasks, as well as one of the extreme points during the reaching tasks.     

Seat Biases in Proportional Representation Systems with Thresholds

In proportional representation systems, apportionment methods are used to convert the number of votes of a party into the number of seats allocated to this party. An interesting characteristic of any such method are the seat biases, that is, the expected differences between the actual seat allocation and the ideal share of seats, separately for each party, when parties are ordered from largest to smallest. For electoral systems with a threshold, that is, with a minimum percentage of votes that parties must reach in order to be eligible to participate in the apportionment process, we show that seat biases decrease from their maximum to zero, as the threshold increases from zero to its maximum, and that all seat biases decrease linearly.     

UP OR DOWN? A MALE ECONOMIST'S MANIFESTO ON THE TOILET SEAT ETIQUETTE

This paper develops an economic analysis of the toilet seat etiquette. I investigate whether there is any efficiency justification for the presumption that men should leave the toilet seat down after use. I find that the “down rule” is inefficient unless there is a large asymmetry in the inconvenience costs of shifting the position of the toilet seat across genders. I show that the “selfish” or the “status quo” rule that leaves the toilet seat in the position used dominates the down rule in a wide range of parameter spaces including the case where the inconvenience costs are the same. (JEL D7, H4)     

Furniture dimensions and postural overload for schoolchildren's head, upper back and upper limbs

The aim of this study was to evaluate how the fixed furniture dimensions match with students' anthropometry and to describe head, upper back and upper limbs postures and movements. Evaluation was performed in 48 students from a Brazilian state school. Furniture dimensions were measured with metric tape, movements and postures by inclinometers (Logger Tecknologi, ?karp, Sweden). Seat height was high for 21% and low for 36% of the students; seat length was short for 45% and long for 9% and table height was high for 53% and low for 28%. Regression analysis showed that seat/popliteal height quotient is explained by 90th percentile of upper back inclination (β=0.410) and 90th percentile of right upper arm elevation (β=-0.293). For seat/thigh length quotient the significant variables were 90th percentile of upper back velocity (β=-0.282) and 90th percentile of right upper arm elevation (β=0.410). This study showed a relationship between furniture mismatch and postural overload. When the seat height is low students increase upper back left inclination and right upper arm elevation; when the seat is short students decrease the upper back flexion velocity and increase right upper arm elevation.     

A Note on Logistic Regression and Odds Ratios

Abstract

Observed seat belt use on a private university campus was compared with use by the general population of the state in which the university is located. It was expected, given the higher educational level and socioeconomic status of the university population, that seat belt use would be higher than it is for the general population. The results of the study indicated that seat belt use by members of the university community was actually significantly lower than that reported statewide. The statistically significant difference was even greater for front-seat passengers than for drivers on campus.     

Three experiments to support the design of lightweight comfortable vehicle seats

Seats need to be more lightweight for airplanes, cars, busses and even trains to contribute to a better environment and to reduce energy consumption. However, a reduction in comfort due to weight reduction is not preferable, which opens a new area of research: improving comfort with a minimum of material or with lightweight materials and systems. In this paper three experiments are performed to test the effects of light weight seats and parts of a seat on comfort. The first experiment shows that a new developed light weight massage system improves comfort and reduces muscle activity. The second experiment shows that the automatic seat adjustment without motors improves the comfort as well. The third experiment showed that a light weight seat following closely the human body contour is experienced on many aspects in the same way as current more heavy seats. More research and models will be needed in this ergonomic field which needs more attention.     

Reducing whole body vibration in forklift drivers

Forklift drivers in warehouses are often exposed to whole body vibration (WBV) during the total day. There is however an association between working as a forklift operator and the development of low back pain. In this study the exposure to WBV was measured in five forklift drivers who performed a standardised order picking task during 10 minutes. The effect of driving surface (uneven concrete vs. new flat concrete), driving speed (15 km/h vs. 8 km/h) and seat suspension (mechanical suspension vs. air suspension) was investigated. Improving the driving surface was the most effective preventive measure by reducing the whole body vibration with 39%, from 1.14 to 0.69 m/s2. Lowering the speed limit resulted in a reduction of WBV with 26% (1.05 vs. 0.78 m/s2). An air suspension seat was 22% more effective compared to mechanical suspension (1.02 vs. 0.80 m/s2). On uneven concrete an air suspension seat performed even better by reducing the WBV by 29% (1.33 vs. 0.95 m/s2). A combination of a new driving surface, limiting the maximum speed and the introduction of an air suspension seat reduced the whole body vibrations below the action limit of 0.5 m/s2 as mentioned in the European directive. None of the interventions were effective enough on their own.     

Mandatory seat belt laws in the states. A study of fatal and severe occupant injuries

This study examines the impact of mandatory seat belt laws on fatal and incapacitating injury rates in the states. Annual data for all 50 states for the period 1975-1991 are used. Pooled time series analysis is employed. The general conclusion that emerges from this analysis is that seat belt laws significantly impact state fatal injury rates. Primary enforcement and all-seat coverage provisions appear to be particularly effective in reducing fatality rates.     

Candidate Sex and Congressional Elections

Abstract

In 1992, an unprecedented number of women were elected to Congress. This election seemed to debunk the notion of female disadvantage as female candidates ran better than males. Since 1992, however, female candidates have failed to compete as effectively as men in congressional elections, again raising the specter of a sex bias. In this paper, we examine 365 open seat congressional elections held since 1982 in order to ascertain whether the indicators of female success in the 1980s and early 1990s structured female candidate success and/or failure after 1992. For this study, these indicators include candidate attributes such as financial quality and candidate experience. Our examination indicates that candidate attributes have significantly weakened as predictors of open seat election outcomes, especially in female versus male races. Instead, a strong increase in the correlation of the presidential normal vote and the congressional vote in open seats since 1992 indicates the emergence of elections where candidate attributes are secondary to the partisanship of the district. Female versus male races demonstrate much higher partisan coherence than all-male open seat contests, and Democratic women run about six points behind Republican women when district partisanship is controlled. These factors, combined with the increasingly Democratic distribution of female nominations, mitigate against female gains through open seats after 1992.     

EVALUATING THE EFFECTIVENESS OF CHILD SAFETY SEATS AND SEAT BELTS IN PROTECTING CHILDREN FROM INJURY

Young children are required to use child safety seats, and the age threshold at which children can legally graduate to seat belts has steadily increased. This article tests the relative effectiveness of child safety seats, lap‐and‐shoulder seat belts, and lap belts in preventing injuries among motor vehicle passengers aged 2–6 yr. We analyze three large, representative samples of crashes reported to police, as well as linked hospital data. We find no apparent difference in the two most serious injury categories for children in child safety seats versus lap‐and‐shoulder belts. Child safety seats provide a statistically significant 25% reduction in the least serious injury category. Lap belts are somewhat less effective than the two other types of restraints but far superior to riding unrestrained. (JEL I18)     

凯麦拉出租车机械开门装置

上海汽车锻造总厂研制的凯麦拉出租车机械开门装置可使驾驶员遥控右后门的开闭,而不必离开自己的座位。     

Differences in health determinants between international and domestic students at a German university

The authors used a standardized questionnaire to survey 201 international and 193 German students at the University of Bielefeld, Germany, to determine differences in health practices between the 2 groups and to identify targets for health-promoting interventions. Multivariate logistic regression models revealed that long-term female international students (those whose duration of residency in Germany was more than 2 years) had lower levels of physical activity and alcohol consumption than their German counterparts and higher rates of smoking independently associated with international citizenship. Short-term international female students were less likely than German students to receive social support. Among men, long-term international student status was associated with daily smoking and inconsistent seat belt use, whereas short-term student status was associated with a lower rate of seat belt use, a higher level of perceived stress, and a healthier diet, compared with domestic students. Findings from the study could give rise to health-promotion activities for international students at German universities; additional studies at other European universities are necessary before making further recommendations.     

Pressure group size and the politics of income redistribution

Numerous authors have argued that small groups with concentrated interests have an advantage over larger groups with more diffuse interests. We argue that the reverse situation is more likely. In addition, we extend the one candidate analysis to situations where there are two contestants for any one legislative seat.     

The use of thermal manikin to evaluate interface pressure distribution

The use of a thermal buttocks manikin was explored as a tool to standardize the evaluation of seat comfort. Thermal manikin buttocks were developed and calibrated thermally and anatomically to simulate the sensible heat transfer of a seated person and used to evaluate interface pressure distribution. In essence, the pressure maps of manikin buttocks with and without heating were compared to those of a seated person. The results of average pressure demonstrated that the thermal manikins have a better response in interface pressure measurement than manikins without heating.     

Ergonomic evaluation of processes and products in the manufacture of upholstery

This study aimed to perform an ergonomic evaluation of industrial processes and products - upholstered sofas - produced in the furniture cluster of Ubá-MG. The used material was collected from two sofas upholstered industries associated with the union of the furniture industries of Ubá region, located in Minas Gerais estate, Brazil. As for the product were evaluated dimensionally 29 upholstered sofas, with 12 being produced by industry "A" and 17 being produced by industry "B". As for the process, were evaluated: the socioeconomic profile of the worker and environmental factors of lighting and noise. The main results of this study showed that the upholstered sofas produced by industries, in general, fulfilled to the recommendations set out in the work in relation to the backrest height and useful seat depth. All the sofas, however, proved to be inadequate in relation to the seat height to the floor and the dimensions of the armrests Regarding environmental aspects, it was observed that in both industries, the activities in most jobs are performed under adverse conditions to the health and safety of workers and nonconformity with the limits set by Brazilian regulatory standard used in this work.     

The Balinski–Young Comparison of Divisor Methods is Transitive

The ‘favoring small states’ relation of Balinski and Young (Fair representation, 1982) imposes stronger requirements on the nature of seat transfers than the majorization-ordering introduced by Marshall et al. (Soc Choice Welfare 19(4):885–900, 2002). For divisor methods, however, the two relations coincide. As a consequence, when restricted to the class of divisor methods the Balinski and Young relation is transitive.     

Building buy-in: The need for internal relationships and informal coalitions

Significant research has focused on influencing senior leadership, and this study offers new insights into building internal relationships and informal coalitions to provide strategic counsel. These strategies involve internal communications, a neglected area of research and practice. The findings are based on in-depth interviews with 30 executives representing multiple departments in four U.S. companies. A new role justifying public relations’ membership in executive decision teams is internal boundary spanning or gathering intelligence internally across business units, and requires public relations to have a seat at multiple decision tables.