Projects for Pallet Recycling in a Solid Modeling Course

The main objective of the projects in our solid modeling course was to find innovative ways of recycling pallets. Pallets are the single largest consumer of hardwood lumber in the United States. Recovered pallet lumber has been proposed as a potential source of material for value added wood products. This recycling activity creates jobs, decreases the volume of pallets going into landfills, and eases the demand that new pallet manufacture places on timber resources. Recycling is important due to low cost of entry into recycling, and increasing environmental concerns regarding resource use and waste disposal.Cockrell School of Engineerin

Is a Growing Middle Class Good for the Poor? Social Policy in a Time of Globalization

We examine the effect of the rise and evolution of the middle class on extreme poverty, using the World Bank's international poverty line of $1.90 per person per day in 2011 purchasing power parity (PPP)- adjusted terms. Like the definition of poverty, the definition of the middle class used here is also set in absolute terms, comprising households where per capita income or consumption lies between$11 and $110 per person per day in 2011 PPP terms—referred to as a "global," as opposed to national, definition of the middle class (Kharas, 2017). We argue that middle-class expansion initially is pro-poor given the incentives of the emerging middle class and the working poor to cooperate on matters of social policy. As citizens join the ranks of the middle class, they lobby for programs that provide them income stability and protections against shocks (social insurance). By allying with the working poor who seek social assistance (income transfers), middle-class constituents increase their bargaining power relative to elites who seek labor flexibility and lower taxes in a competitive global economy. Over time, however, as the middle class prospers and acquires greater political influence, the balance of programs shifts increasingly toward social insurance and away from social assistance. In this way, the middle class begins to capture an increasing proportion of the benefits of social spending, leaving less for welfare services targeted exclusively at the poorest. One implication of this is that the emerging middle class has never been truly progressive, because progressivity ultimately comes at its own expense

The vicious circles of control - regional governments and insiders in privatized Russian enterprises

How can one account for the puzzling behavior of insider-managers who, in stripping assets from the veryfirms they own, appear to be stealing from one pocket to fill the other? The authors suggest that such asset-stripping and failure to restructure are the consequences of interactions between insiders (manager-owners) and regional governments in a particular property rights regime. In this regime, the ability to realize value is limited by uncertainty and illiquidity, so managers have little incentive to increase value. As the central institutions that rule Russia have ceded their powers to the regions, regional governments have imposed various distortions on enterprises to protect local employment. Prospective outsider-investors doubt they can acquire the control rights they need for restructuring firms and doubt they can avoid the distortions regional governments impose on the firms in which they might invest. The result: little restructuring and little new investment. And regional governments, knowing the firms'taxable cash flows will have been reduced through cash flow diversion, have responded by collecting revenues in kind. To disentangle these vicious circles of control, the authors propose a pilot for transforming ownership in insider-dominated firms through a system of simultaneous tax-debt-for-equity conversion and resale through competitive auctions. The objective: to show regional governments, for example, that a more sustainable way to protect employment is to give managers incentives to increase enterprises'value by transferring effective control to investors. The proposed mechanism would provide cash benefits to insiders who agree to sell control to outside investors. The increased cash revenue (rather than in-kind or money surrogates) would enable regional governments to finance safety nets for the unemployed and to promote other regional initiatives.International Terrorism&Counterterrorism,Municipal Financial Management,Banks&Banking Reform,Economic Theory&Research,Payment Systems&Infrastructure,Municipal Financial Management,Economic Theory&Research,National Governance,Environmental Economics&Policies,Banks&Banking Reform

Political Constraints and Public Support for Market Reform

As concerns of "reform fatigue" in lower- and middle-income countries have become more widespread, so has the search for ways of boosting support for market-oriented reforms. Although the effects of political institutions on reform results have been extensively analyzed, there has been relatively little investigation of their effects on public opinion. We argue that constitutional and extra-constitutional reforms that place limits on the discretionary authority of public officials and enable voters to monitor, reward, and sanction politicians can enhance the legitimacy of market reforms. We present a voting model with asymmetric information to illustrate that these formal-legal reforms provide a credible signal of reformers' commitments. Using panel data based on public opinion barometers from Eastern Europe and Latin America, we examine the effects of political authority on public support for markets. We find that constraints on the power of the executive branch boost support for markets but that this effect declines as the reform process matures. Copyright 2006, International Monetary Fund

The political economy of financial repression in transition economies

Financial systems in developing countries tend to be"restricted"or"repressed"through burdensome reserve requirements, interest-rate ceilings, foreign-exchange regulations, rules about the composition of bank balance sheets, or heavy taxation of the financial sector. Why are governments drawn to regulate financial markets to the point of financial repression? To address this question, the authors explore preliminary evidence from the post-Communist economies of Eastern Europe and the former Soviet Union, where financial regulations have rarely been examined systematically. They find that public-finance framework has limited ability to explain financial repression in the transition economies, given the peculiar financial lineage of the socialist state. The weak distinction between"public"and"private"spheres of finance in transition economies means that the deficit often conveys little information about the governments'real fiscal activities. It is more fruitful to examine how political institutions, by shaping the incentives politicians face, affect financial policy. Their findings suggest that post-Communist governments may adopt repressive financial controls - not to finance deficits more cheaply than would be the caseunder financial liberalization, but to maintain the authority and ensure the survival of those in power. In countries where pre-reform elites are plentiful in legislative bodies, where interparty competition is low, and where government parties are well-represented in parliaments, elites have been able to perpetuate a system of implicit subsidies by"softening up"the financial sector - especially commercial banks - to ensure the continued flow of cheap credit to specific borrowers. The main beneficiaries of these policies - large formerly state-owned industries with tight financial links to the largest commercial banks - are thus able to convert their well-established claims on public resources into preferential access to credit lines. In other words, financial repression in transition economies may simply serve to solidify main-bank, main-firm relations. These results would lend support to the claim of smaller, cash-starved Eastern European entrepreneurs that the commercial banks have"taken over the role of the old planning ministries."Banks&Banking Reform,Financial Intermediation,Payment Systems&Infrastructure,Environmental Economics&Policies,Economic Theory&Research,Environmental Economics&Policies,National Governance,Financial Intermediation,Banks&Banking Reform,Economic Theory&Research

Fiscal federalism and regional growth : evidence from the Russian Federation in the 1990s

Subnational fiscal autonomy-the basis for fiscal federalism in modern federations-is meant to serve two roles. First, local control over revenue collection is meantto provide a check on the capacity of central authorities to tax arbitrarily local capital. Second, retention of taxes raised locally is meant to establish incentives for subnational governmental authorities to foster endemic economic growth as a way of promoting local tax bases. But in the Russian Federation, fiscally autonomous regions have often resisted market-oriented reforms, the enactment of rules protecting private property, and the dismantling of price controls and barriers to trade. The authors find statistical evidence in support of the hypothesis that fiscal incentives of the Russian regions represent an important determinant of regional economic performance. The authors also seek to understand the conditions under which fiscal autonomy prompts regional growth and recovery, and the conditions under which it has adverse economic effects. They argue that the presence of"unearned"income streams-particularly in the form of revenues from natural resource production or from budgetary transfers from the central government-has turned regions dependent on these income sources into"rentier"regions. As such, governments in these regions have used local control over revenues and expenditures to shelter certain firms (natural resource producers or loss-making enterprises) from market forces. Using new fiscal data from 80 Russian regions from 1996-99, the authors test this central hypothesis in both single- and simultaneous-equation specifications. Their results indicate that tax retention (as a proxy for fiscal autonomy) has a positive effect on the cumulative output recovery of regions since the breakup of the Soviet Union. But they also find that this effect decreases as rentable income streams to regions increase.National Governance,Public Sector Economics&Finance,Environmental Economics&Policies,Banks&Banking Reform,Municipal Financial Management,National Governance,Public Sector Economics&Finance,Banks&Banking Reform,Municipal Financial Management,Environmental Economics&Policies

Simulating vibration transmission and comfort in automated driving integrating models of seat, body, postural stabilization and motion perception

To enhance motion comfort in (automated) driving we present biomechanical models and demonstrate their ability to capture vibration transmission from seat to trunk and head. A computationally efficient full body model is presented, able to operate in real time while capturing translational and rotational motion of trunk and head with fore-aft, lateral and vertical seat motion. Sensory integration models are presented predicting motion perception and motion sickness accumulation using the head motion as predicted by biomechanical models

The impact of body and head dynamics on motion comfort assessment

Head motion is a key determinant of motion comfort and differs substantially from seat motion due to seat and body compliance and dynamic postural stabilization. This paper compares different human body model fidelities to transmit seat accelerations to the head for the assessment of motion comfort through simulations. Six-degree of freedom dynamics were analyzed using frequency response functions derived from an advanced human model (AHM), a computationally efficient human model (EHM) and experimental studies. Simulations of dynamic driving show that human models strongly affected the predicted ride comfort (increased up to a factor 3). Furthermore, they modestly affected sickness using the available filters from the literature and ISO-2631 (increased up to 30%), but more strongly affected sickness predicted by the subjective vertical conflict (SVC) model (increased up to 70%)

Kinematic body responses and perceived discomfort in a bumpy ride: Effects of sitting posture

The present study investigates perceived comfort and whole-body vibration transmissibility in intensive repetitive pitch exposure representing a bumpy ride. Three sitting strategies (preferred, erect, and slouched) were evaluated for perceived body discomfort and body kinematic responses. Nine male and twelve female participants were seated in a moving-based driving simulator. The slouched posture significantly increased lateral and yaw body motion and induced more discomfort in the seat back area. After three repetitive exposures, participants anticipated the upcoming motion using more-effective postural control strategies to stabilize pelvis, trunk, and head in space.Comment: 4 pages, 2 tables, 1 figur

Evaluation of motion comfort using advanced active human body models and efficient simplified models

Active muscles are crucial for maintaining postural stability when seated in a moving vehicle. Advanced active 3D non-linear full body models have been developed for impact and comfort simulation, including large numbers of individual muscle elements, and detailed non-linear models of the joint structures. While such models have an apparent potential to provide insight into postural stabilization, they are computationally demanding, making them less practical in particular for driving comfort where long time periods are to be studied. In vibrational comfort and in general biomechanical research, linearized models are effectively used. This paper evaluates the effectiveness of simplified 3D full-body human models to capture comfort provoked by whole-body vibrations. An efficient seated human body model is developed and validated using experimental data. We evaluate the required complexity in terms of joints and degrees of freedom for the spine, and explore how well linear spring-damper models can approximate reflexive postural stabilization. Results indicate that linear stiffness and damping models can well capture the human response. The results are improved by adding proportional integral derivative (PID) and head-in-space (HIS) controllers to maintain the defined initial body posture. The integrator is shown to be essential to prevent drift from the defined posture. The joint angular relative displacement is used as the input reference to each PID controller. With this model, a faster than real-time solution is obtained when used with a simple seat model. The paper also discusses the advantages and disadvantages of various models and provides insight into which models are more appropriate for motion comfort analysis