This paper describes the problems found in geographic databases design during the conceptual modeling of real world elements that are related by a network structure. It is believed that is possible to reach a better quality of the geographical data if spatial integrity constraints about the elements on a network are specified in a conceptual level. Hence, the purpose of this paper is to expand ...

One of the most important problems for distribution companies is to find the best locations for depots and to find proper routes for transportation vehicles and to optimize supply network. This study intends to develop a model for the problem of location-routing in post offices. So, a new Bi-Objective Location-Routing Problem for Locating Town Post Office and Routing Parcels is defined. This pr...

The airlines provide a critical service to the nation’s economy, providing rapid, safe, and affordable transportation over large geographic distances. The reliability of this transportation service, defined as the difference between the ticketed arrival time and the actual passenger arrival time, translates into economic productivity. For example, in 2007, the total delays experienced by airlin...

We are interested in estimating individual labels given only coarse, aggregated signal over the data points. In our setting, we receive sets (“bags”) of unlabeled instances with constraints on label proportions. We relax the unrealistic assumption of known label proportions, made in previous work; instead, we assume only to have upper and lower bounds, and constraints on bag differences. We mot...

Creating a perceptually distinct coloring for visualizing large data sets with one or more related properties can be difficult, even for a domain expert. To aid in the color selection process, we present a method for selecting an optimized coloring for these data sets by applying a force-directed algorithm. The method we have implemented selects hue values using a constraint graph derived from ...

This paper focuses on private sources of knowledge specifically customers and competitors as sources of innovative activity. Our main argument is that the two sources are correlated even after controlling for several factors at the level of technology, individual and organization. What is more, we show that the geographical distance of these sources modifies the intensity of this correlation, i...

This empirical study focuses on the impact of an information technology (IT), specifically electronic mail (e-mail), on three basic organization components: structure, people, and tasks. An Organizational Interaction Diamond (OID) model is developed illustrating how each component enables changes in other components interacting with the organization’s internal and external environments. The org...

Globally distributed software development is facing challenges brought by geographic distance, temporal separation, and cultural diversity. Yet research regarding the impact of temporal separation and cultural differences is limited. This paper draws on an interpretive case study to examine the influence of culture on temporal separation and coordination of globally distributed software develop...

This paper presents a method to model network delay for overlay network application. The network topology measurement technology and network AS information is used to build up model of network delay via AS and geographic distance. Based on global Internet measurement result, we calculated the parameters of the model. Furthermore, the model verification is done by comparing on AS-MMI protocol an...

In this research, we examine the relationship between power and three characteristics of construal—abstraction, valence, and certainty—in individuals’ verbatim reactions to the events of September 11, 2001 and during the immediate aftermath of the terrorist attacks. We conceptualize power as a form of social distance and find that position power (but not expert power) was positively associated ...