19,713 research outputs found
Introduction and allegro for violin and orchestra
Thesis (M.A.)--Boston Universit
A Note on the Sparing Number of the Sieve Graphs of Certain Graphs
Let denote the set of all non-negative integers and
be its power set. An integer additive set-indexer
(IASI) of a given graph is an injective function such that the induced function defined by is also
injective. An IASI of a graph is said to be a weak IASI of if
for all . A graph which admits a
weak IASI may be called a weak IASI graph. The sparing number of a graph is
the minimum number of edges with singleton set-labels required for a graph
to admit a weak IASI. In this paper, we introduce the notion of -sieve
graphs of a given graph and study their sparing numbers.Comment: 9 pages, 3 figures, Publishe
On the Continuous CNN Problem
In the (discrete) CNN problem, online requests appear as points in
. Each request must be served before the next one is revealed. We
have a server that can serve a request simply by aligning either its or
coordinate with the request. The goal of the online algorithm is to minimize
the total distance traveled by the server to serve all the requests. The
best known competitive ratio for the discrete version is 879 (due to Sitters
and Stougie).
We study the continuous version, in which, the request can move continuously
in and the server must continuously serve the request. A simple
adversarial argument shows that the lower bound on the competitive ratio of any
online algorithm for the continuous CNN problem is 3. Our main contribution is
an online algorithm with competitive ratio . Our
analysis is tight. The continuous version generalizes the discrete orthogonal
CNN problem, in which every request must be or aligned with the
previous request. Therefore, Our result improves upon the previous best
competitive ratio of 9 (due to Iwama and Yonezawa)
Grain Distribution in Ghana under Imperfectly Competitive Market Conditions
Interspatial and intertemporal grain distribution in Ghana is a private sector activity carried out mainly by traders. These traders sometimes collude to maximize their joint profits. By so doing they influence the conduct of the grains market. To examine the effect of their actions on the informal maize market in Ghana, a spatial equilibrium model was estimated under three scenarios: (1) Perfect competition, (2) Cournot-Narsh conjectures, and (3) Collusion. The results indicate that imperfect competition distorts grain flows, reduces consumer welfare and depresses traders’ sales revenue. Collusive behavior of traders, on the other hand, causes the greatest distortion of grain flows as well as trader and consumer welfare. These results draw attention to policy makers and development agents to educate traders against using their associations to foster collusion.Spatial equilibrium, monopoly, imperfect competition, interspatial, Cournot- Narsh conjectures, Crop Production/Industries, D4, L1,
A Brief Version of the Family Background Questionnaire
Although it is lengthy. the Family Background Questionnaire provides reliable behaviorally specific family history information. Results from reliability and validity analyses suggest that a brief version of this instrument that assesses parental responsiveness, child maltreatment, and parental substance abuse would provide a useful screening instrument for obtaining family history information
Grain price adjustment asymmetry: the case of cowpea in Ghana
Patterns in price adjustment in response to information are important to market practitioners. This study looks at cowpea real wholesale price adjustment patterns in Bolgatanga, Wa, Makola and Techiman markets in Ghana. Using Techiman as the central market, a threshold autoregressive test for asymmetric price adjustment rejected the null hypothesis of symmetric adjustment for only the Bolgatanga-Techiman price series. An autoregressive conditional heteroskedastic regression indicates that wholesalers in Bolgatanga market respond differentially to price signals from Techiman than those in the other two markets. This suggests that policies targeting cowpea traders must recognize the differential responses by wholesalers to information.Africa, Ghana, wholesalers, market information, autoregressive conditional heteroskedasticity, threshold autoregressive, Crop Production/Industries, D82, D43,
Biomass production and management practices in mixed crop-livestock systems in the west African Sahel: Opportunities and constraints
The Sahel is characterized by a marked inter-annual climate variability and has experienced a number of food security crises following the severe droughts during the 1970s and 1980s. Due to recent challenges such as rapid population growth, climate change, environmental concerns and market changes which cause major impacts to their production systems, the sahelian people have been shifting and adapting their production systems and the way they live to cope with uncertainties. The objective of the present report is to review the various biomass production and management issues in the mixed crop-livestock systems in West African Sahel. An elaborated literature survey of peer reviewed papers mostly, was conducted. The studies were based on the Sahel scale research, more specifically research that had been published on the West African Sahel, including studies published between 1990s and 2016. Results show that many factors have contributed to the changes, among which, rainfall variability, population growth, human induced-activities, land tenure systems and the effects of globalization. Various biomass production and management practices are employed in West African Sahel for both on-farm and off-farm biomass improvements. Some of the best practices are mulching, soil and water conservation techniques, composting, farmer managed natural regeneration, agroforestry, etc. These practices have overall contributed to increase agricultural productivity, ecosystem services provisioning and have sometime deepened the difference between men and women, rich and poor, young and old people. Most of the constraints associated with large adoption of the best practices in the Sahel are land tenure systems, the huge gap between inputs and output investment costs but, the climate conventions are offering new opportunities that will ultimately contribute to positive changes. This will be possible only when land tenure systems in the region are reinforced, institutional linkages are strengthened, and new information systems are used to inform farmers on climate issues and new agricultural practices
An integer programming approach to the Hospitals/Residents problem with ties
The classical Hospitals/Residents problem (HR) models the assignment of junior doctors to hospitals based on their preferences over one another. In an instance of this problem, a stable matching M is sought which ensures that no blocking pair can exist in which a resident r and hospital h can improve relative to M by becoming assigned to each other. Such a situation is undesirable as it could naturally lead to r and h forming a private arrangement outside of the matching. The original HR model assumes that preference lists are strictly ordered. However in practice, this may be an unreasonable assumption: an agent may find two or more agents equally acceptable, giving rise to ties in its preference list. We thus obtain the Hospitals/Residents problem with Ties (HRT). In such an instance, stable matchings may have different sizes and MAX HRT, the problem of finding a maximum cardinality stable matching, is NP-hard. In this paper we describe an Integer Programming (IP) model for MAX HRT. We also provide some details on the implementation of the model. Finally we present results obtained from an empirical evaluation of the IP model based on real-world and randomly generated problem instances
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