This thesis presents new contributions to the area of pen-based interfaces for 3D shape modeling: (1) a simple but efficient algorithm for segmenting markings of pen input, (2) an interaction framework for pen-based applications, and (3) based on these two, a new 3D modeling environment. The segmentation of pen markings is a hidden difficulty in the development of a penbased application. It is ...

In this article, some existing error estimation methods are presented and their suitability for modern software development projects is analyzed. Based on this analysis, a new software error estimation method SEEC (Software Error Estimation by Component-wise comparison), specifically designed for multi-site, multi-component software projects, is introduced. The required activities and the mathe...

In this paper we present an analysis and modeling case study for agent mediated knowledge management in educational environments: Help&Learn, an agent-based peer-to-peer helpdesk system to support extraclass interactions among students and teachers. Help&Learn expands the student’s possibility of solving problems, getting involved in a cooperative learning experience that transcends the limits ...

A proper segmentation of pen marking enhances shape recognition and enables a natural interface for sketch-based modeling from simple line drawing tools to 3D solid modeling applications; user input is otherwise restricted to draw only one segment per one stroke. In general, the pen marking segmentation is achieved by detecting the points of high curvature-called, segmenting points-and splittin...

In role-based access control (RBAC) permissions are associated with roles, and users are made members of appropriate roles thereby acquiring the roles' permissions. The principal motivation behind RBAC is to simplify administration. Several frameworks for the development of role-based systems have been introduced. There are, however, a few works specifying RBAC in a way which system developers ...

With the availability of pen-enabled digital hardware, sketch-based 3D modeling is becoming an increasingly attractive alternative to traditional methods in many design environments. To date, a variety of methodologies and implemented systems have been proposed that all seek to make sketching the primary interaction method for 3D geometric modeling. While many of these methods are promising, a ...

Despite the crucial role of introductory sections in argumentative academic writing, the effects of genre- based approaches to writing introductory paragraphs have not been much explored yet. The present study aimed to investigate whether the provision of genre knowledge through modeling and non-modeling could enhance learners’ ability in writing introductory paragraphs of argumentative essays....

Collaborative learning motivates active participation of individuals in their learning process, which often results in the attaining of creative and critical thinking skills. In this way, students and teachers are viewed as both providers and consumers of knowledge gathered in environments where everybody teaches and learns, by interacting with each other. Peer-to-peer networking reflects and s...

Abstract: Situations can arise in which organizations have to merge policies that are based on different access control frameworks, such as Role Based Access Control (RBAC) and Mandatory Access Control (MAC). Integrating policies requires addressing the following question: How will the integration impact access to protected resources? In particular, one needs to determine that the integration d...

Agent-Based Modeling (ABM) and simulation have gained popularity in the Geographic Information Systems (GIS) domain. Despite the increasing number of models built by experts and users, it remains challenging for users to specify their models in a manner in which one can understand it. This constraint represents an inhibition to the development and acceptance of the ABM approach. In this paper, ...