Public Perceptions of the Midwest’s Pavements: Policies and Tradeoffs in Pavement Improvement

With the budget crisis plaguing so many states, pavement management will compete more vigorously for limited funds. Findings reported from a tri-state pooled-fund research project provide insights and guidelines for pavement improvement derived from the perceptions of the driving public. The Phase II responses from statewide surveys in Iowa, Minnesota, and Wisconsin address the topics of perceptions of the State Departments of Transportation (DOTs), pavement repair tradeoffs, and pavement evaluation. The results disclose specific public perceptions of priorities for spending limited highway funds. Implications for pavement management, policy, planning, as well as for marketing to garner additional funds are explored

Anti-Competitive Marketing Practices in the Airline Industry

Consumers, airlines and the economy as a whole have benefited from airline deregulation. Government regulation was replaced by competition as the protector of the consumers. Airlines continue to pursue marketing strategies which reduce competition and as act as barriers to new entrants. This paper reviews some of those strategies and suggest actions by which policy makers might encourage competition

Productivity Spillovers to Domestic Plants from Foreign Direct Investment: Evidence from UK Manufacturing, 1974-1995

Empirical literature on the impact of FDI has considered at length the indirect spillover benefits that accrue to domestic plants as a result of FDI presence. However, the imprecise and disparate nature of spillovers makes accurate definition and indeed measurement of them difficult to achieve. In this paper, we consider the definition of what constitutes a spillover from FDI, and setout three main channels for spillovers; within (intra)industry, between (inter)industry and agglomeration. We then go on to measure the indirect impact of FDI on the total factor productivity of domestic plants in a number of UK manufacturing industries, 1974-1995, using a standard production function-based approach. We use data made available from the UK ARD and information derived from UK input-output tables, to establish the potential for inter-industry linkages. Our results indicate that the competition and ëabsorption capacityí effect at times outweighs any potential benefits, leading to negative spillovers. We also find that inter-industry spillovers are generally more prevalent than intra-industry spillovers. Generally, we do not find the agglomeration spillover to be significant. However, we conclude that the nature of spillovers is such that measurement techniques traditionally adopted fail to adequately explain their complex and diverse nature.

Polytopes of Minimum Positive Semidefinite Rank

The positive semidefinite (psd) rank of a polytope is the smallest $k$ for which the cone of $k \times k$ real symmetric psd matrices admits an affine slice that projects onto the polytope. In this paper we show that the psd rank of a polytope is at least the dimension of the polytope plus one, and we characterize those polytopes whose psd rank equals this lower bound. We give several classes of polytopes that achieve the minimum possible psd rank including a complete characterization in dimensions two and three

Voluntary temporary abstinence from alcohol during “Dry January” and subsequent alcohol use

Objective: Temporary abstinence from alcohol may convey physiological benefits and enhance well-being. The aim of this study was to address a lack of information about: (1) correlates of successful completion of a planned period of abstinence, and (2) how success or failure in planned abstinence affects subsequent alcohol consumption. Methods: 857 British adults (249 men, 608 women) participating in the “Dry January” alcohol abstinence challenge completed a baseline questionnaire, a one-month follow-up questionnaire, and a 6-month follow-up questionnaire. Key variables assessed at baseline included measures of alcohol consumption and drink refusal self-efficacy (DRSE). Results: In bivariate analysis, success during Dry January was predicted by measures of more moderate alcohol consumption and greater social DRSE. Multivariate analyses revealed that success during Dry January was best predicted by a lower frequency of drunkenness in the month prior to Dry January. Structural Equation Modelling revealed that participation in Dry January was related to reductions in alcohol consumption and increases in DRSE among all respondents at 6-month follow-up, regardless of success, but these changes were more likely among people who successfully completed the challenge. Conclusions: The findings suggest that participation in abstinence challenges such as “Dry January” may be associated with changes toward healthier drinking and greater DRSE, and is unlikely to result in undesirable “rebound effects”: very few people reported increased alcohol consumption following a period of voluntary abstinence

Reactive control and reasoning assistance for scientific laboratory instruments

Scientific laboratory instruments that are involved in chemical or physical sample identification frequently require substantial human preparation, attention, and interactive control during their operation. Successful real-time analysis of incoming data that supports such interactive control requires: (1) a clear recognition of variance of the data from expected results; and (2) rapid diagnosis of possible alternative hypotheses which might explain the variance. Such analysis then aids in decisions about modifying the experiment protocol, as well as being a goal itself. This paper reports on a collaborative project at the NASA Ames Research Center between artificial intelligence researchers and planetary microbial ecologists. Our team is currently engaged in developing software that autonomously controls science laboratory instruments and that provides data analysis of the real-time data in support of dynamic refinement of the experiment control. the first two instruments to which this technology has been applied are a differential thermal analyzer (DTA) and a gas chromatograph (GC). coupled together, they form a new geochemicstry and microbial analysis tool that is capable of rapid identification of the organiz and mineralogical constituents in soils. The thermal decomposition of the minerals and organics, and the attendance release of evolved gases, provides data about the structural and molecular chemistry of the soil samples

An Agent-based approach to modelling integrated product teams undertaking a design activity.

The interactions between individual designers, within integrated product teams, and the nature of design tasks, all have a significant impact upon how well a design task can be performed, and hence the quality of the resultant product and the time in which it can be delivered. In this paper we describe an ongoing research project which aims to model integrated product teams through the use of multi-agent systems. We first describe the background and rationale for our work, and then present our initial computational model and results from the simulation of an integrated product team. The paper concludes with a discussion of how the model will evolve to improve the accuracy of the simulation

Multiple sensor smart robot hand with force control

A smart robot hand developed at JPL for the Protoflight Manipulator Arm (PFMA) is described. The development of this smart hand was based on an integrated design and subsystem architecture by considering mechanism, electronics, sensing, control, display, and operator interface in an integrated design approach. The mechanical details of this smart hand and the overall subsystem are described elsewhere. The sensing and electronics components of the JPL/PFMA smart hand are summarized and it is described in some detail in control capabilities