Sat, 05 Jul 2008 21:22:36 BST CiteULike: jirlong's watchlist http://www.citeulike.org/user/jirlong/watchlist CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/hannu/article/2283763 <i>Proceedings of the National Academy of Sciences (23 January 2008), 0706851105.</i><br /><br />To comprehend the multipartite organization of large-scale biological and social systems, we introduce an information theoretic approach that reveals community structure in weighted and directed networks. We use the probability flow of random walks on a network as a proxy for information flows in the real system and decompose the network into modules by compressing a description of the probability flow. The result is a map that both simplifies and highlights the regularities in the structure and their relationships. We illustrate the method by making a map of scientific communication as captured in the citation patterns of >6,000 journals. We discover a multicentric organization with fields that vary dramatically in size and degree of integration into the network of science. Along the backbone of the networkincluding physics, chemistry, molecular biology, and medicineinformation flows bidirectionally, but the map reveals a directional pattern of citation from the applied fields to the basic sciences. 10.1073/pnas.0706851105 Maps of random walks on complex networks reveal community structure Martin Rosvall Carl Bergstrom doi:10.1073/pnas.0706851105 Proceedings of the National Academy of Sciences (23 January 2008), 0706851105. 2008-01-24T08:30:08-00:00 2008 Proceedings of the National Academy of Sciences 0706851105 communitydiscovery complexnetworks http://www.citeulike.org/user/hannu/article/2235552 <i>(30 Oct 2003)</i><br /><br />We perform sensitivity analyses to assess the impact of missing data on the structural properties of social networks. The social network is conceived of as being generated by a bipartite graph, in which actors are linked together via multiple interaction contexts or affiliations. We discuss three principal missing data mechanisms: network boundary specification (non-inclusion of actors or affiliations), survey non-response, and censoring by vertex degree (fixed choice design), examining their impact on the scientific collaboration network from the Los Alamos E-print Archive as well as random bipartite graphs. The results show that network boundary specification and fixed choice designs can dramatically alter estimates of network-level statistics. The observed clustering and assortativity coefficients are overestimated via omission of interaction contexts (affiliations) or fixed choice of affiliations, and underestimated via actor non-response, which results in inflated measurement error. We also find that social networks with multiple interaction contexts have certain surprising properties due to the presence of overlapping cliques. In particular, assortativity by degree does not necessarily improve network robustness to random omission of nodes as predicted by current theory. Effects of missing data in social networks Gueorgi Kossinets (30 Oct 2003) 2008-01-15T16:56:18-00:00 2003 missingdata ttm-soc http://www.citeulike.org/user/hannu/article/1939797 <i>Journal of the Operational Research Society, Vol. 58, No. 12. (December 2007), pp. 1605-1611.</i> Social network topology: a Bayesian approach Rhodes Keefe doi:10.1057/palgrave.jors.2602352 Journal of the Operational Research Society, Vol. 58, No. 12. (December 2007), pp. 1605-1611. 2007-11-19T21:42:43-00:00 2007 Journal of the Operational Research Society 0160-5682 58 12 1605 1611 Palgrave Macmillan bayesian ttm-soc http://www.citeulike.org/user/wcrosbie/article/1390815 <i>(Sep 2005)</i> Yahoo.icio.us? - Yahoo Acquires Del.icio.us M Arrington (Sep 2005) 2007-06-14T23:07:37-00:00 2005 collaborative_tagging delicious folksonomies todo yahoo http://www.citeulike.org/user/wcrosbie/article/1390803 <i>Journal of Information Science (2007)</i><br /><br />The weighted list, known popularly as a ‘tag cloud’, has appeared on many popular folksonomy-based websites. Flickr, Delicious, Technorati and many others have all featured a tag cloud at some point in their history. However, it is unclear whether the tag cloud is actually useful as an aid to finding information. We conducted an experiment, giving participants the option of using a tag cloud or a traditional search interface to answer various questions. We found that where the information-seeking task required specific information, participants preferred the search interface. Conversely, where the information-seeking task was more general, participants preferred the tag cloud. While the tag cloud is not without value, it is not sufficient as the sole means of navigation for a folksonomy-based dataset. The Folksonomy Tag Cloud: When is it Useful? James Sinclair Michael Cardew-Hall Journal of Information Science (2007) 2007-06-14T23:03:31-00:00 2007 Journal of Information Science collaborative_tagging folksonomies folksonomy information_architecture jois tag_clouds tagging todo http://www.citeulike.org/user/wcrosbie/article/1240939 <i>International Journal of Computer-Supported Collaborative Learning, Vol. 2, No. 1. (14 March 2007), pp. 9-40.</i> Community-based learning: The core competency of residential, research-based universities Gerhard Fischer Markus Rohde Volker Wulf doi:10.1007/s11412-007-9009-1 International Journal of Computer-Supported Collaborative Learning, Vol. 2, No. 1. (14 March 2007), pp. 9-40. 2007-04-21T05:24:22-00:00 2007 International Journal of Computer-Supported Collaborative Learning 2 1 9 40 2007 community_learning learning_community todo http://www.citeulike.org/user/wcrosbie/article/1232947 <i>(2007)</i><br /><br />Drupal is one of the most popular content management systems in use today. With it, you can create a variety of community-driven sites, including blogs, forums, wiki-style sites, and much more. Pro Drupal Development was written to arm you with knowledge to customize your Drupal installation however you see fit. The book assumes that you already possess the knowledge to install and bring a standard installation online. Then authors John VanDyk and Matt Westgate delve into Drupal internals, showing you how to truly take advantage of its powerful architecture. You'll learn how to create your own modules, develop your own themes, and produce your own filters. You'll learn the inner workings of each key part of Drupal, including user management, sessions, the node system, caching, and the various APIs available to you. Of course, your Drupal-powered site isn't effective until you can efficiently serve pages to your visitors. As such, the authors have included the information you need to optimize your Drupal installation to perform well under high-load situations. Also featured is information on Drupal security and best practices, as well as integration of Ajax and the internationalization of your Drupal web site. Simply put, if you are working with Drupal at all, then you need this book. * This book is written by Drupal core developers. * Drupal architecture and behavior are mapped out visually. * Common pitfalls are identified and addressed. * Chapters provide regular discussion and reference to why things work they way they do, not just how. * The front matter features a foreword by Dries Buytaert, Drupal founder. Pro Drupal Development John Vandyk Matt Westgate (2007) 2007-04-18T05:36:41-00:00 2007 Apress cms content_management drupal http://www.citeulike.org/user/wcrosbie/article/690779 <i>netWorker, Vol. 10, No. 2. (June 2006), pp. 15-17.</i> Web 2.0: is it really different? Win Treese doi:10.1145/1138096.1138106 netWorker, Vol. 10, No. 2. (June 2006), pp. 15-17. 2006-06-09T08:31:16-00:00 2006 netWorker 1091-3556 10 2 15 17 ACM Press 2006 article classification folksonomies folksonomy social-navigation social-networks social-software tagging web web_2 web20 web-design http://www.citeulike.org/user/wcrosbie/article/988480 <i>(7 Dec 2006)</i><br /><br />The new social media sites -- blogs, wikis, Flickr and Digg, among others -- underscore the transformation of the Web to a participatory medium in which users are actively creating, evaluating and distributing information. Digg is a social news aggregator which allows users to submit links to, vote on and discuss news stories. Each day Digg selects a handful of stories to feature on its front page. Rather than rely on the opinion of a few editors, Digg aggregates opinions of thousands of its users to decide which stories to promote to the front page. <br />Digg users can designate other users as “friends” and easily track friends' activities: what new stories they submitted, commented on or read. The friends interface acts as a social filtering system, recommending to user stories his or her friends liked or found interesting. By tracking the votes received by newly submitted stories over time, we showed that social filtering is an effective information filtering approach. Specifically, we showed that (a) users tend to like stories submitted by friends and (b) users tend to like stories their friends read and liked. As a byproduct of social filtering, social networks also play a role in promoting stories to Digg's front page, potentially leading to “tyranny of the minority” situation where a disproportionate number of front page stories comes from the same small group of interconnected users. Despite this, social filtering is a promising new technology that can be used to personalize and tailor information to individual users: for example, through personal front pages. Social Networks and Social Information Filtering on Digg Kristina Lerman (7 Dec 2006) 2006-12-11T11:22:21-00:00 2006 collaborative_filtering digg filtering networking networks recommender_systems social-inoformation-filtering http://www.citeulike.org/user/wcrosbie/article/894202 <i>Communities and Technologies (2005), pp. 191-213.</i><br /><br />Knowledge sharing communities can be found in many organizations, but their forms and functions appear to be quite diverse. This implies that questions concerning the functioning of communities, (how do they work) and questions concerning success conditions (how to organize and facilitate them) cannot be answered in a general way. The purpose of this article is to develop the theory in this area by discovering basic dimensions along which communities differ, and by identifying basic types of knowledge communities, underlying the diversity of knowledge sharing groups. Through an analysis of the literature and of a series of communities in large organizations, two basic dimensions and five archetypes of knowledge communities are identified. Archetypes of Knowledge Communities Erik Andriessen doi:10.1007/1-4020-3591-8_11 Communities and Technologies (2005), pp. 191-213. 2006-10-12T12:07:56-00:00 2005 Communities and Technologies 191 213 archetypes community cop cscw km knowledge knowledge_communities knowledge-sharing practices tido http://www.citeulike.org/user/wcrosbie/article/1003489 <i>Lecture Notes in Computer Science : On the Move to Meaningful Internet Systems 2006: OTM 2006 Workshops (2006), pp. 181-188.</i> Community-Driven Ontology Evolution Based on Folksonomies Domenico Gendarmi Filippo Lanubile doi:10.1007/11915034_41 Lecture Notes in Computer Science : On the Move to Meaningful Internet Systems 2006: OTM 2006 Workshops (2006), pp. 181-188. 2006-12-20T13:04:15-00:00 2006 Lecture Notes in Computer Science : On the Move to Meaningful Internet Systems 2006: OTM 2006 Workshops 181 188 collaborative_tagging community folksonomies folksonomy knowledge-sharing lncs ontology tagging todo http://www.citeulike.org/user/wcrosbie/article/1123233 <i>Communities and technologies (2003), pp. 119-141.</i><br /><br />This paper investigates the contribution of ICT to knowledge sharing in communities of practice. A theoretical model is built that identifies the possible influence of ICT on the extent to which knowledge is shared within a community, as well as a number of variables that determine the extent to which this contribution is realized. This theoretical model was tested within two ICT-facilitated communities for professionals in the area of working conditions. The results of these case studies show that ICT's most important contribution to knowledge sharing in communities consists of the realization of a shared information base (communality) and facilitating communication independent of time and place (connectivity). The results also show that trust among members of a community, and their identification with the community, are important influences on knowledge sharing. Task interdependence and the community's information culture are also identified as important influences. Knowledge sharing in knowledge communities Bart van den Hooff Wim Elving Jan Meeuwsen Claudette Dumoulin Communities and technologies (2003), pp. 119-141. 2007-02-26T17:18:31-00:00 2003 Communities and technologies 119 141 Kluwer, B.V. acm community connectivity cops km knowledge_communities todo http://www.citeulike.org/user/wcrosbie/article/604363 <i></i><br /><br />This paper is about semantic blogging, an application of the semantic web to blogging. The semantic web promises to make the web more useful by endowing metadata with machine processable semantics. Blogging is a lightweight web publishing paradigm which provides a very low barrier to entry, useful syndication and aggregation behaviour, a simple to understand structure and decentralized construction of a rich information network. Semantic blogging builds upon the success and clear network value... Semantic Blogging: Spreading the Semantic Web Meme Steve Digital 2006-04-27T12:10:27-00:00 blogging blogs collaboration semantics semantic_web http://www.citeulike.org/user/wcrosbie/article/769977 <i>Educational Researcher, Vol. 18, No. 1. (1989), pp. 32-42.</i><br /><br />Many teaching practices implicitly assume that conceptual knowledge can be abstracted from the situations in which it is learned and used. This article argues that this assumption inevitably limits the effectiveness of such practices. Drawing on recent research into cognition as it is manifest in everyday activity, the authors argue that knowledge is situated, being in part a product of the activity, context, and culture in which it is developed and used. They discuss how this view of knowledge affects our understanding of learning, and they note that conventional schooling too often ignores the influence of school culture on what is learned in school. As an alternative to conventional practices, they propose "cognitive apprenticeship" (Collins, Brown, & Newman, in press), which honors the situated nature of knowledge. They examine two examples of mathematics instruction that exhibit certain key features of this approach to teaching. Situated Cognition and the Culture of Learning John Brown Allan Collins Paul Duguid Educational Researcher, Vol. 18, No. 1. (1989), pp. 32-42. 2006-07-23T04:01:04-00:00 1989 Educational Researcher 18 1 32 42 1989 duguid situated_cognition todo http://www.citeulike.org/user/wcrosbie/article/1022357 <i>(November 2005)</i> SemperWiki: a semantic personal Wiki Eyal Oren (November 2005) 2007-01-02T16:32:41-00:00 2005 semantic semantic_web semperwiki todo wiki http://www.citeulike.org/user/wcrosbie/article/884606 <i>(2006), pp. 11-22.</i><br /><br />Blogging has become the newest communication medium for creating a virtual community, a set of blogs linking back and forth to one another's postings, while discussing common topics. In this paper, we examine how communities can be discovered through interconnected blogs as a form of social hypertext [14]. We propose a method and model that detects structures of community in the social network of blogs by integrating McMillan and Chavis' sense of community [26] along with network analysis [8, 11]. From the model, we measure community in the blogs by aligning centrality measures from social network analysis [17] with measures of sense of community obtained using behavioural surveys. We then illustrate the use of this approach with a case study built around an independent music blog. The strength of community measures were found to be well aligned with the network structure, based on centrality measures. Even though the sample size from the case study was small, once the structure and measure of communities are calibrated according to our social hypertext model, communities can be automatically found and measured for other blogs without the need for behavioural surveys. A social hypertext model for finding community in blogs Alvin Chin Mark Chignell doi:10.1145/1149941.1149945 (2006), pp. 11-22. 2006-10-05T10:46:21-00:00 2006 11 22 ACM Press acm bloggin community hypertext social_network_theory todo http://www.citeulike.org/user/hannu/article/1934390 <i>(31 May 2007)</i><br /><br />Networks are widely used in the biological, physical, and social sciences as a concise mathematical representation of the topology of systems of interacting components. Understanding the structure of these networks is one of the outstanding challenges in the study of complex systems. Here we describe a general technique for detecting structural features in large-scale network data which works by dividing the nodes of a network into classes such that the members of each class have similar patterns of connection to other nodes. Using the machinery of probabilistic mixture models and the expectation-maximization algorithm, we show that it is possible to detect, without prior knowledge of what we are looking for, a very broad range of types of structure in networks. We give a number of examples demonstrating how the method can be used to shed light on the properties of real-world networks, including social and information networks. Mixture models and exploratory analysis in networks MEJ Newman EA Leicht (31 May 2007) 2007-11-18T21:16:04-00:00 2007 communitydiscovery graphs ttm-soc http://www.citeulike.org/user/hannu/article/1907590 <i>(2005)</i> Inference in Sensor Networks: Graphical Models and Particle Methods AT Ihler (2005) 2007-11-13T14:50:43-00:00 2005 ttm-stat http://www.citeulike.org/user/hannu/article/1856294 <i>(1994), pp. 87-97.</i><br /><br />We introduce a methodology for performing approximate computations in complex probabilistic expert systems, when some components can be handled exactly and others require approximation or simulation. This is illustrated by means of a modified version of the familiar `chest-clinic' problem. Keywords: probabilistic expert system; graphical model; local computation; Monte Carlo. 1 Introduction Markov Chain Monte-Carlo (MCMC) methods have over the last decade become increasingly popular as a... Hybrid Propagation in Junction Trees Philip Dawid Uffe Kjaerulff Steffen Lauritzen (1994), pp. 87-97. 2007-11-02T13:45:14-00:00 1994 87 97 beliefpropagation junctiontrees ttm-stat http://www.citeulike.org/user/hannu/article/507310 <i>Information Theory, IEEE Transactions on, Vol. 51, No. 7. (2005), pp. 2282-2312.</i><br /><br />Important inference problems in statistical physics, computer vision, error-correcting coding theory, and artificial intelligence can all be reformulated as the computation of marginal probabilities on factor graphs. The belief propagation (BP) algorithm is an efficient way to solve these problems that is exact when the factor graph is a tree, but only approximate when the factor graph has cycles. We show that BP fixed points correspond to the stationary points of the Bethe approximation of the free energy for a factor graph. We explain how to obtain region-based free energy approximations that improve the Bethe approximation, and corresponding generalized belief propagation (GBP) algorithms. We emphasize the conditions a free energy approximation must satisfy in order to be a "valid" or "maxent-normal" approximation. We describe the relationship between four different methods that can be used to generate valid approximations: the "Bethe method", the "junction graph method", the "cluster variation method", and the "region graph method". Finally, we explain how to tell whether a region-based approximation, and its corresponding GBP algorithm, is likely to be accurate, and describe empirical results showing that GBP can significantly outperform BP. Constructing free-energy approximations and generalized belief propagation algorithms JS Yedidia WT Freeman Y Weiss doi:10.1109/TIT.2005.850085 Information Theory, IEEE Transactions on, Vol. 51, No. 7. (2005), pp. 2282-2312. 2006-02-16T21:45:03-00:00 2005 Information Theory, IEEE Transactions on 51 7 2282 2312 beliefpropagation informationtheory statmech ttm-stat http://www.citeulike.org/user/hannu/article/863284 <i>(2002)</i><br /><br />In many applications of graphical models arising in computer vision, the hidden variables of interest are most naturally specified by continuous, non-Gaussian distributions. There exist inference algorithms for discrete approximations to these continuous distributions, but for the highdimensional variables typically of interest, discrete inference becomes infeasible. Stochastic methods such as particle filters provide an appealing alternative. However, existing techniques fail to exploit the... Nonparametric Belief Propagation E Sudderth A Ihler W Freeman A Willsky (2002) 2006-09-23T13:11:34-00:00 2002 ttm-stat http://www.citeulike.org/user/hannu/article/1807043 <i></i> An Exploration of Location Error Estimation D Dearman A Varshavsky E de Lara KN Truong 2007-10-22T15:41:43-00:00 Springer ttm-laby http://www.citeulike.org/user/hannu/article/1807036 <i>(2004), pp. 33-42.</i><br /><br />In light of recent attempts to design location-based mobile services, we present findings from a study of the ways in which positioning is done in everyday talk over the mobile phone. We show that a location is more than a coordinate on a map, and give examples of how people formulate location in a number of different ways according to the particulars of the activity. Based on these findings, we argue that rather than delivering location information in the form of geographical coordinates, location-based services should describe location in ways relevant to the users, thereby supporting the existing positioning practice. "I'm waiting where we met last time": exploring everyday positioning practices to inform design A Weilenmann P Leuchovius (2004), pp. 33-42. 2007-10-22T15:38:58-00:00 2004 33 42 ACM Press: NY cell locative media naming phone positioning ttm-laby http://www.citeulike.org/user/hannu/article/1807022 <i>(2003)</i> Informing the Evaluation of Can You See Me Now? in Rotterdam: Runners' and Control Room Work A Crabtree (2003) 2007-10-22T15:34:15-00:00 2003 collaboration evaluation mobility ttm-laby http://www.citeulike.org/user/hannu/article/1807007 <i>(September 2004), pp. 70-87.</i><br /><br />The use of positioning systems is an important but problematic aspect of `context aware' applications. Through focusing on location-based games, we introduce the approach of self-reported positioning in which players explicitly and implicitly reveal their positions by manipulating electronic maps. A study of a game that piloted this approach demonstrates that self-reported positioning can be a reliable low-tech alternative to automated systems such as GPS. We contrast the strategies used by humans to generate position updates -- reporting at landmarks and junctions and ahead and behind themselves -- with automated approaches, drawing out implications for how we think of positioning error and design positioning systems. The Error of our Ways: The experience of Self-Reported Position in a Location-Based Game S Benford W Seagar M Flintham R Anastasi D Rowland J Humble D Stanton J Bowers N Tandavanitj M Adams Row Farr A Oldroyd J Sutton (September 2004), pp. 70-87. 2007-10-22T15:29:42-00:00 2004 70 87 ttm-laby http://www.citeulike.org/user/hannu/article/1807002 <i>(FebruaryJune-FebruarySeptember June 2004), pp. 86-93.</i><br /><br />In Augmented Reality (AR), interfaces consist of a blend of both real and virtual content. In this paper we examine existing gaming styles played in the real world or on computers. We discuss the strengths and weaknesses of these mediums within an informal model of gaming experience split into four aspects; physical, mental, social and emotional. We find that their strengths are mostly complementary, and argue that games built in AR can blend them to enhance existing game styles and open up new ones. To illustrate these ideas, we present our work on AR Worms, a re-implementation of the classic computer game Worms using Augmented Reality. We discuss how AR has enabled us to start exploring interfaces for gaming, and present informal observations of players at several demonstrations. Finally, we present some ideas for AR games in the area of strategy and role playing games. Motivations for Augmented Reality Gaming R Nilsen S Linton J Looser (FebruaryJune-FebruarySeptember June 2004), pp. 86-93. 2007-10-22T15:28:39-00:00 2004 86 93 augmented game motivations reality ttm-laby http://www.citeulike.org/user/hannu/article/1806998 <i>(2004)</i> Negotiating the fluidity of mobile work M Kakihara C Sorensen M Wiberg (2004) 2007-10-22T15:27:09-00:00 2004 augmented awareness computing cscw location mobile reality ttm-laby ubiquitous werable http://www.citeulike.org/user/hannu/article/1806997 <i>(2005), pp. 81-90.</i><br /><br />Advances in location-enhanced technology are making it easier for us to be located by others. These new technologies present a difficult privacy tradeoff, as disclosing one's location to another person or service could be risky, yet valuable. To explore whether and what users are willing to disclose about their location to social relations, we conducted a three-phased formative study. Our results show that the most important factors were who was requesting, why the requester wanted the participant's location, and what level of detail would be most useful to the requester. After determining these, participants were typically willing to disclose either the most useful detail or nothing about their location. From our findings, we reflect on the decision process for location disclosure. With these results, we hope to influence the design of future location-enhanced applications and services. Location disclosure to social relations: why, when and what people want to share S Consolvo IE Smith T Matthews A Lamarca J Tabert P Powledge (2005), pp. 81-90. 2007-10-22T15:27:09-00:00 2005 81 90 disclosure location privacy ttm-laby http://www.citeulike.org/user/hannu/article/1806977 <i>Environment and Planning D: Society & Space, Vol. 19, No. 4. (2001), pp. 485-504.</i><br /><br />In often-noticed feature of mobile phone calls is some form of 'geographical' locating after a greeting has been made. The author uses some singular instances of mobile phone conversations to provide an answer as to why this geolinguistic feature has emerged. In an examination of two real cases and a vignette, some light is shed on a more classical spatial topic, that of mobility. During the opening and closing statements of the paper a short critique is put forward of the 'professionalisation' of cultural studies and cultural geography and their ways of theorising ordinary activities. It is argued that a concern with theory construction effectively distances such workers from everyday affairs where ordinary actors understand in practical terms and account competently for what is going on in their worlds. This practical understanding is inherent in the intricacies of a conversational 'ordering', which is at one and the same time also an ordering of the times and spaces of these worlds. By means of an indifferent approach to the 'grand theories' of culture, some detailed understandings of social practices are offered via the alternatives of ethnomethodological and conversational investigations Why people say where they are during mobile phone calls E Laurier Environment and Planning D: Society & Space, Vol. 19, No. 4. (2001), pp. 485-504. 2007-10-22T15:26:05-00:00 2001 Environment and Planning D: Society & Space 19 4 485 504 cell formulation location phone ttm-laby http://www.citeulike.org/user/hannu/article/1806974 <i>(2005)</i><br /><br />This paper presents an exploratory field study investigating the behavioral effects of mobile location-aware computing on rendezvousing. Participants took part in one of three mobile device conditions (a mobile phone, a location-aware handheld or both a mobile phone and a location-aware handheld) and completed different rendezvousing scenarios. We present one of the scenarios in depth and discuss the effect of location-awareness on rendezvous behaviour. Effect of location-awareness on rendezvous behaviour D Dearman K Hawkey KM Inkpen (2005) 2007-10-22T15:25:26-00:00 2005 ACM Press location-awareness pda rendezvousing ttm-laby http://www.citeulike.org/user/hannu/article/1806957 <i>(2005)</i><br /><br />This paper presents an exploratory field study investigating the behavioral effects of mobile location-aware computing on rendezvousing. Participants took part in one of three mobile device conditions (a mobile phone, a location-aware handheld or both a mobile phone and a location-aware handheld) and completed different rendezvousing scenarios. We present one of the scenarios in depth and discuss the effect of location-awareness on rendezvous behaviour. Effect of location-awareness on rendezvous behaviour D Dearman K Hawkey KM Inkpen (2005) 2007-10-22T15:24:52-00:00 2005 ACM Press location-awareness pda rendezvousing ttm-laby http://www.citeulike.org/user/hannu/article/1806952 <i>Transactions of CHI (2005)</i><br /><br />We present a study of a mobile mixed reality game called Can You See Me Now? in which online players are chased through a virtual model of a city by `runners' (i.e., professional performers equipped with GPS and WiFi technologies) who have to run through the actual city streets in order to catch the players. We present an ethnographic study of the game as it toured through two different cities that draws upon video recordings of online players, runners, technical support crew, and also on system logs of text communication. Our study reveals the diverse ways in which online players experienced the uncertainties inherent in GPS and WiFi, including being mostly unaware of them, but sometimes seeing them as problems, or treating the as a designed feature of the game, and even occasionally exploiting them within gameplay. In contrast, the runners and technical crew were fully aware of these uncertainties and continually battled against them through an ongoing and distributed process of orchestration. As a result, we encourage designers to deal with such uncertainties as a fundamental characteristic of location-based experiences rather than treating them as exceptions or bugs that might be ironed out in the future. We argue that designers should explicitly consider four potential states of being of a mobile participant -- connected and tracked, connected but not tracked, tracked but not connected, and neither connected nor tracked. We then introduce five strategies that might be used to deal with uncertainty in these different states for different kinds of participant: remove it, hide it, manage it, reveal it and exploit it. Finally, we present proposals for new orchestration interfaces that reveal the `seams' in the underlying technical infrastructure by visualizing the recent performance of GPS and WiFi and predicting the likely future performance of GPS. Can You See Me Now S Benford A Crabtree M Flintham A Drozd R Anastasi M Paxton N Tandavanitj M Adams Row Farr Transactions of CHI (2005) 2007-10-22T15:22:46-00:00 2005 Transactions of CHI ethnography game location-awareness location-based ttm-laby http://www.citeulike.org/user/hannu/article/1806947 <i>Personal and Ubiquitous Computing, Vol. 7 (2003), pp. 70-79.</i><br /><br />Mobile contexts of use vary a lot, and may even be continuously changing during use. The context is much more than location, but its other elements are still difficult to identify or measure. Location informa- tion is becoming an integral part of different mobile devices. Current mobile services can be enhanced with location-aware features, thus providing the user with a smooth transition towards context-aware services. Po- tential application fields can be found in areas such as travel information, shopping, entertainment, event in- formation and different mobile professions. This paper studies location-aware mobile services from the user's point of view. The paper draws conclusions about key issues related to user needs, based on user interviews, laboratory and field evaluations with users, and expert evaluations of location-aware services. The user needs are presented under five main themes: topical and comprehensive contents, smooth user interaction, personal and user-generated contents, seamless service entities and privacy issues. User needs for location-aware mobile services E Kaasinen Personal and Ubiquitous Computing, Vol. 7 (2003), pp. 70-79. 2007-10-22T15:21:28-00:00 2003 Personal and Ubiquitous Computing 7 70 79 cell expectations location-awareness phone ttm-laby users http://www.citeulike.org/user/hannu/article/959695 <i>Personal and Ubiquitous Computing, Vol. V10, No. 5. (2006), pp. 319-323.</i> Social functions of location in mobile telephony Ilkka Arminen doi:10.1007/s00779-005-0052-5 Personal and Ubiquitous Computing, Vol. V10, No. 5. (2006), pp. 319-323. 2006-11-23T13:46:27-00:00 2006 Personal and Ubiquitous Computing V10 5 319 323 locative mobile ttm-laby http://www.citeulike.org/user/hannu/article/1806904 <i></i> Alternate Reality Games: Interview with Adam Martin Aleks Krotoski 2007-10-22T15:02:13-00:00 ttm-laby http://www.citeulike.org/user/hannu/article/1806903 <i></i> Soapbox: ARGs and How to Appeal to Female Gamers Andrea Phillips 2007-10-22T15:02:13-00:00 ttm-laby http://www.citeulike.org/user/hannu/article/1806902 <i>Comput. Entertain., Vol. 4, No. 1. (2006)</i> Extending cyberspace: location based games using cellular phones Omer Rashid Ian Mullins Paul Coulton Reuben Edwards Comput. Entertain., Vol. 4, No. 1. (2006) 2007-10-22T15:02:13-00:00 2006 Comput. Entertain. 4 1 ACM Press ttm-laby http://www.citeulike.org/user/hannu/article/1806901 <i>CGDC Conference Proceedings (2002), pp. 35-45.</i> All the Worldâsa Botfighter Stage: Notes on Location-Based Multi-User Gaming O Sotamaa CGDC Conference Proceedings (2002), pp. 35-45. 2007-10-22T15:02:13-00:00 2002 CGDC Conference Proceedings 35 45 ttm-laby http://www.citeulike.org/user/hannu/article/1806900 <i>Proceedings of the SIGCHI conference on Human factors in computing systems: Changing our world, changing ourselves (2002), pp. 415-422.</i> Making sense of sensing systems: five questions for designers and researchers V Bellotti M Back WK Edwards RE Grinter A Henderson C Lopes Proceedings of the SIGCHI conference on Human factors in computing systems: Changing our world, changing ourselves (2002), pp. 415-422. 2007-10-22T15:02:13-00:00 2002 Proceedings of the SIGCHI conference on Human factors in computing systems: Changing our world, changing ourselves 415 422 ACM Press New York, NY, USA ttm-laby http://www.citeulike.org/user/hannu/article/1806899 <i>Proceedings of Pervasive (2005)</i> Place Lab: Device Positioning Using Radio Beacons in the Wild A Lamarca Y Chawathe S Consolvo J Hightower I Smith J Scott T Sohn J Howard J Hughes F Potter Others Proceedings of Pervasive (2005) 2007-10-22T15:02:13-00:00 2005 Proceedings of Pervasive Springer ttm-laby http://www.citeulike.org/user/hannu/article/1806898 <i>Proceedings of the Ubi-Comp (2002)</i> Can You See Me Now? A Citywide Mixed-Reality Gaming Experience R Anastasi N Tandavanitj M Flintham A Crabtree M Adams Row Farr J Iddon S Benford T Hemmings S Izadi Others Proceedings of the Ubi-Comp (2002) 2007-10-22T15:02:13-00:00 2002 Proceedings of the Ubi-Comp ttm-laby http://www.citeulike.org/user/hannu/article/1806897 <i>ACM Trans. Comput.-Hum. Interact., Vol. 13, No. 1. (2006), pp. 100-133.</i> Can you see me now? Steve Benford Andy Crabtree Martin Flintham Adam Drozd Rob Anastasi Mark Paxton Nick Tandavanitj Matt Adams Ju Farr ACM Trans. Comput.-Hum. Interact., Vol. 13, No. 1. (2006), pp. 100-133. 2007-10-22T15:02:13-00:00 2006 ACM Trans. Comput.-Hum. Interact. 13 1 100 133 ACM Press ttm-laby http://www.citeulike.org/user/hannu/article/1806896 <i>European Information Society Technologies (IST) Event The Netherlands, November. http://www. starofdena. com/Docs/DENA\_Cross MediaObservations. pdf Date accessed May, Vol. 15 (2004)</i> Current State of Cross Media Storytelling: Preliminary Observations for Future Design C Dena European Information Society Technologies (IST) Event The Netherlands, November. http://www. starofdena. com/Docs/DENA\_Cross MediaObservations. pdf Date accessed May, Vol. 15 (2004) 2007-10-22T15:02:13-00:00 2004 European Information Society Technologies (IST) Event The Netherlands, November. http://www. starofdena. com/Docs/DENA\_Cross MediaObservations. pdf Date accessed May 15 ttm-laby http://www.citeulike.org/user/hannu/article/1806895 <i>London: JISC Technology and Standards Watch (2005)</i> Future Location-Based Experiences S Benford London: JISC Technology and Standards Watch (2005) 2007-10-22T15:02:13-00:00 2005 London: JISC Technology and Standards Watch ttm-laby http://www.citeulike.org/user/hannu/article/1806894 <i>Proc. Advances in Computer Entertainment (ACE 2004)</i> Uncle Roy All Around You: Implicating the City in a Location-Based Performance S Benford M Flintham A Drozd R Anastasi D Rowland N Tandavanitj M Adams Row Farr A Oldroyd J Sutton Proc. Advances in Computer Entertainment (ACE 2004) 2007-10-22T15:02:12-00:00 Proc. Advances in Computer Entertainment (ACE 2004) ttm-laby http://www.citeulike.org/user/hannu/article/883617 <i>(2005), pp. 9-16.</i> EventRank: a framework for ranking time-varying networks Joshua O'Madadhain Padhraic Smyth doi:10.1145/1134271.1134273 (2005), pp. 9-16. 2006-10-04T11:36:31-00:00 2005 9 16 ACM Press ttm-soc http://www.citeulike.org/user/hannu/article/1779552 <i>Physical Review Letters, Vol. 86, No. 25. (18 June 2001), 5835.</i><br /><br />Many biological; ecological; and economic systems are best described by weighted networks; as the nodes interact with each other with varying strength. However; most evolving network models studied so far are binary; the link strength being either 0 or 1. In this paper we introduce and investigate the scaling properties of a class of models which assign weights to the links as the network evolves. The combined numerical and analytical approach indicates that asymptotically the total weight distribution converges to the scaling behavior of the connectivity distribution; but this convergence is hampered by strong logarithmic corrections. Weighted Evolving Networks SH Yook H Jeong AL Barabási Y Tu doi:10.1103/PhysRevLett.86.5835 Physical Review Letters, Vol. 86, No. 25. (18 June 2001), 5835. 2007-10-17T12:18:52-00:00 2001 Physical Review Letters 86 25 5835 American Physical Society complexnetworks ttm-soc weightedgraphs http://www.citeulike.org/user/hannu/article/1774723 <i>Uncertainty in Artificial Intelligence, Vol. 17 (2001), pp. 362-369.</i> Expectation propagation for approximate Bayesian inference TP Minka Uncertainty in Artificial Intelligence, Vol. 17 (2001), pp. 362-369. 2007-10-16T14:08:25-00:00 2001 Uncertainty in Artificial Intelligence 17 362 369 ttm-stat http://www.citeulike.org/user/hannu/article/1774722 <i>(2003)</i> Information theory, inference, and learning algorithms DJC Mackay (2003) 2007-10-16T14:08:25-00:00 2003 Cambridge University Press New York ttm-stat http://www.citeulike.org/user/TobiSpecht/article/1711370 <i>(2006)</i> German Entertainment and Media Outlook: 2006-2010 pricewaterhousecoopers (2006) 2007-09-30T13:56:51-00:00 2006 PriceWaterhouseCoopers corporate gaming media