Error-Correcting Codes for Automatic Control

Systems with automatic feedback control may consist of several remote devices, connected only by unreliable communication channels. It is necessary in these conditions to have a method for accurate, real-time state estimation in the presence of channel noise. This problem is addressed, for the case of polynomial-growth-rate state spaces, through a new type of error-correcting code that is online and computationally efficient. This solution establishes a constructive analog, for some applications in estimation and control, of the Shannon coding theorem

The Data Big Bang and the Expanding Digital Universe: High-Dimensional, Complex and Massive Data Sets in an Inflationary Epoch

Recent and forthcoming advances in instrumentation, and giant new surveys, are creating astronomical data sets that are not amenable to the methods of analysis familiar to astronomers. Traditional methods are often inadequate not merely because of the size in bytes of the data sets, but also because of the complexity of modern data sets. Mathematical limitations of familiar algorithms and techniques in dealing with such data sets create a critical need for new paradigms for the representation, analysis and scientific visualization (as opposed to illustrative visualization) of heterogeneous, multiresolution data across application domains. Some of the problems presented by the new data sets have been addressed by other disciplines such as applied mathematics, statistics and machine learning and have been utilized by other sciences such as space-based geosciences. Unfortunately, valuable results pertaining to these problems are mostly to be found only in publications outside of astronomy. Here we offer brief overviews of a number of concepts, techniques and developments, some "old" and some new. These are generally unknown to most of the astronomical community, but are vital to the analysis and visualization of complex datasets and images. In order for astronomers to take advantage of the richness and complexity of the new era of data, and to be able to identify, adopt, and apply new solutions, the astronomical community needs a certain degree of awareness and understanding of the new concepts. One of the goals of this paper is to help bridge the gap between applied mathematics, artificial intelligence and computer science on the one side and astronomy on the other.Comment: 24 pages, 8 Figures, 1 Table. Accepted for publication: "Advances in Astronomy, special issue "Robotic Astronomy

Models and tools for value systems analysis in collaborative environments

Dissertation to obtain the degree of Doctor in Electrical and Computer Engineering, specialization of Collaborative NetworksParticipation in collaborative networks is vital for small and medium-sized enterprises to survive in the current market, bringing them several benefits. However,participation in collaborative networks also involves risks and often consortia fail due to internal conflicts. Conflicts can be originated by different prioritization of values and different perceptions of outcomes. The perception of outcomes is, to some extent, subjective given that it depends on the preferences of the subject and how exchanges are evaluated. Therefore, the establishment of a common Value System or the effort to align the Value Systems of network members can play an important role in the collaboration sustainability. Although the topic of values and values alignment has been studied within the scope of various scientific disciplines, there is still no common understanding on these concepts and the literature does not include any suitable models to formally represent and analyze Value Systems within the scope of collaborative networks. This thesis proposes a set of models and formal mechanisms for specifying and analyzing Value Systems in collaborative networks. The development of models and methods followed a hybrid approach, where qualitative and quantitative techniques are used in order to represent and analyze the Value System. A web application was designed and a prototype developed in order to show that the models and methods proposed can be implemented by a computer program and can be integrated into a single framework in order to support Value Systems management within the scope of collaborative networks. The application of a multifaceted and systematic validation strategy, supported by the “Square Validation Framework” brought together a set of preliminary results that attest the theoretical and practical relevance of the proposed approach and allow us to conclude that: (i) it is possible to define and analyze Value Systems in collaborative networks, considering the economic and sociologic approach, in an integrated and unambiguous way, (ii) the potential impacts between Value Systems in collaborative environments can be inferred if the typical influences among core values are known and the preferences of the actors, regarding those values, are identified; (iii) the identification and assessment of Value Systems misalignments would be improved if qualitative and quantitative assessment methods integrating the notion of shared-values, potential for conflict and positive impacts were developed

An approach for real world data modelling with the 3D terrestrial laser scanner for built environment

Capturing and modelling 3D information of the built environment is a big challenge. A number of techniques and technologies are now in use. These include EDM, GPS, and photogrammetric application, remote sensing and traditional building surveying applications. However, use of these technologies cannot be practical and efficient in regard to time, cost and accuracy. Furthermore, a multi disciplinary knowledge base, created from the studies and research about the regeneration aspects is fundamental: historical, architectural, archeologically, environmental, social, economic, etc. In order to have an adequate diagnosis of regeneration, it is necessary to describe buildings and surroundings by means of documentation and plans. However, at this point in time the foregoing is considerably far removed from the real situation, since more often than not it is extremely difficult to obtain full documentation and cartography, of an acceptable quality, since the material, constructive pathologies and systems are often insufficient or deficient (flat that simply reflects levels, isolated photographs,..). Sometimes the information in reality exists, but this fact is not known, or it is not easily accessible, leading to the unnecessary duplication of efforts and resources. In this paper, we discussed 3D laser scanning technology, which can acquire high density point data in an accurate, fast way. Besides, the scanner can digitize all the 3D information concerned with a real world object such as buildings, trees and terrain down to millimetre detail Therefore, it can provide benefits for refurbishment process in regeneration in the Built Environment and it can be the potential solution to overcome the challenges above. The paper introduce an approach for scanning buildings, processing the point cloud raw data, and a modelling approach for CAD extraction and building objects classification by a pattern matching approach in IFC (Industry Foundation Classes) format. The approach presented in this paper from an undertaken research can lead to parametric design and Building Information Modelling (BIM) for existing structures. Two case studies are introduced to demonstrate the use of laser scanner technology in the Built Environment. These case studies are the Jactin House Building in East Manchester and the Peel building in the campus of University Salford. Through these case studies, while use of laser scanners are explained, the integration of it with various technologies and systems are also explored for professionals in Built Environmen

Knowledge Construction by Users: A Content Analysis Framework and A Knowledge Construction Process Model for Virtual Product User Communities

Purpose–The purpose of this study is to develop a content analysis framework and from that derive a process model of knowledge construction in the context of virtual product user communities, organization sponsored online forums where product users collaboratively construct knowledge to solve their technical problems. Design/methodology/approach–The study is based on a deductive, qualitative content analysis of discussion threads about solving technical problems selected from a series of virtual product user communities. This data is complemented with thematic analysis of interviews with forum members. Findings–This research develops a content analysis framework for knowledge construction. It is based on a combination of existing codes derived from frameworks developed for Computer Supported Collaborative Learning (CSCL) and new categories identified from the data. Analysis using this framework allows the authors to propose a knowledge construction process model showing how these elements are organised around a typical “trial-and-error” knowledge construction strategy. Practical Implications–The research makes suggestions about organizations’ management of knowledge activities in virtual product user communities, including moderators’ roles in facilitation. Originality/Value– The paper outlines a new framework for analysing knowledge activities where there is a low level of critical thinking and a model of knowledge construction by trial and error. The new framework and model can be applied in other similar contexts

We're on a road to nowhere... new forms of work organization and national cultures

The main objective of this paper is to discuss how far the cultural environment is related to the potential that new forms of work organization, namely autonomy and teamwork, have for success. To accomplish this objective two main approaches will be used: on the one hand, the Socio-Technical Systems(STS) approach, as the main theoretical background for new forms of work organization; and on the other hand, Hofstede’s Cultural Dimensions as the theoretical model to frame the concept of national cultures. The study was developed using data from 23 EU countries. The study showed that the correlation between national cultures and new forms of work organization are significant, yet moderate. Moreover, differences in the impact of cultural dimensions on work design practices were found. The use of autonomy and teamwork can be insufficient to represent the wide variety of work design practices in STS. The same is also valid for cultural dimensions. An understanding of the cultural constraints on work design practices in EU countries can help improve organization models, furthering competitiveness.culture; work organization; autonomy; teamwork; Europe; Hofstede

An anthropological investigation of urban land development : a thesis presented in partial fulfilment of the requirements for the degree of M.A. in Social Anthropology at Massey University

The impetus for this project came from examples of neighbours' disempowerment in the land and property development process. There is a growing academic consensus that dominant approaches to land development fail to adequately address this issue. NeoMarxist approaches focus on conflict, power, and exploitation, but effectively eliminate the role of the actual developer in exercising power. Case study approaches, on the other hand, have been concerned with conflict and disempowerment, but have focused on specific instances of neighbourhood opposition and resistance. Explanation is often confined to local and national features of the social and geographical environment. These inadequacies pointed to the need to investigate the increasingly significant role that professional, entrepreneurial developers play at the nexus of the contemporary development process. An ethnographic methodology was used to provide a richer understanding of the land and property development process. The principal participants in the study are a set of 'entrepreneurial developers' operating in and around Palmerston North. Interviews, participant observation, and the examination of case studies are employed. This is complemented by an investigation of the Regulatory Procedure, including interviews with Council Officers, and examination of Council case studies. The research also uses interviews with neighbours, and a wide body of material published within the development industry. Planning for the study drew on Giddens' 'Theory of Structuration' (1979,1984) which stresses the interrelationship between the social structures of the development process, and the agency of developers. The research sought to elucidate the dominant forms of action and ideology which development agents acknowledge, and which therefore constitute the action and ideology of the development industry. The interpretation of the empirical data uses three interrelated perspectives: The first, provides a broad, industry-level, perspective on the local development industry. It asks, 'What are the major influences which shape and structure the contemporary development industry?'; The second, examines the level of action. It asks 'What are the actions of most significance to developers?', and 'What forms of conduct constitute the Institutional structures of the Regulatory Procedure?'; The third focuses on ideology. It asks, 'What are the dominant motivations which direct and influence developers' conduct?', and 'How do developers legitimate and rationalise conduct?'. An interesting aspect to the thesis is the extent to which developers share patterns of ideology, not only with each other, but also with a wider business community. Much of this characteristic ideology parallels findings in other ethnographic studies of capitalistic systems. The research highlights the fact that ethnography, and the notion of 'culture', provide an insightful and useful perspective of both the business world, and the study of development

Tangible user interfaces : past, present and future directions

In the last two decades, Tangible User Interfaces (TUIs) have emerged as a new interface type that interlinks the digital and physical worlds. Drawing upon users' knowledge and skills of interaction with the real non-digital world, TUIs show a potential to enhance the way in which people interact with and leverage digital information. However, TUI research is still in its infancy and extensive research is required in or- der to fully understand the implications of tangible user interfaces, to develop technologies that further bridge the digital and the physical, and to guide TUI design with empirical knowledge. This paper examines the existing body of work on Tangible User In- terfaces. We start by sketching the history of tangible user interfaces, examining the intellectual origins of this field. We then present TUIs in a broader context, survey application domains, and review frame- works and taxonomies. We also discuss conceptual foundations of TUIs including perspectives from cognitive sciences, phycology, and philoso- phy. Methods and technologies for designing, building, and evaluating TUIs are also addressed. Finally, we discuss the strengths and limita- tions of TUIs and chart directions for future research