<div class="page" title="Page 1"><div class="layoutArea"><div class="column"><p><span>We are in a ‘personal data gold rush’ driven by advertising being the primary revenue source for most online companies. These companies accumulate extensive personal data about individuals with minimal concern for us, the subjects of this process. This can cause many harms: privacy infringement, personal and professional embarrassment, restricted access to labour markets, restricted access to highest value pricing, and many others. There is a critical need to provide technologies that enable alternative practices, so that individuals can par- ticipate in the collection, management and consumption of their personal data. In this paper we discuss the Databox, a personal networked device (and associated services) that col- lates and mediates access to personal data, allowing us to re- cover control of our online lives. We hope the Databox is a first step to re-balancing power between us, the data subjects, and the corporations that collect and use our data. </span></p></div></div></div>

Algebraic effects and their handlers have been steadily gaining attention as a programming language feature for composably expressing user-defined computational effects. While several prototype implementations of languages incorporating algebraic effects exist, Multicore OCaml incorporates effect handlers as the primary means of expressing concurrency in the language. In this paper, we make the observation that effect handlers can elegantly express particularly difficult programs that combine system programming and concurrency without compromising performance. Our experimental results on a highly concurrent and scalable web server demonstrate that effect handlers perform on par with highly optimised monadic concurrency libraries, while retaining the simplicity of direct-style code.

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PERVASIVE computing 55Audio Networking:The Forgotten Wireless Technology M odern computing and communication devices offer a wide range of wireless communication protocols to transmit data, such as infrared, Bluetooth, and Wi-Fi. However, one technology has fallen off the radar in recent years, even though it's more ubiquitous with lower power requirements. Audio networking uses audible sounds as a lowbandwidth data channel and can enhance, for example, smart phone 1 usability. In that domain, audio networking offers both short-range communication with nearby devices as well as longer-range data transfer by introducing audio data packets into ongoing telephone conversations. Moreover, applying audio networking to smart phone applications doesn't change the fundamental devices people use to communicate. Instead, it can exploit the existing programmable interfaces that modern smart phones offer to augment modes of communication that people already know and use.In this article, we'll review various modulation schemes we've worked with previously, covering how to transfer data to nearby smart phones as well as usability and security issues. We'll consider audio networking as a mechanism for introducing data packets into ongoing mobile phone calls. We'll also discuss some real-world problems reported with telephone conferencing and apply audio-networking techniques to them in a case study application. 56 PERVASIVE computing www.computer.org/pervasive JULY-SEPTEMBER 2005 PERVASIVE computing 59 Telephone call Audio communication Other communication (such as Internet or phone) RFCOMM SCO Richard Dave RFCOMM SCO Internet Figure 3. Architecture of smart phone and PC/laptop integration via Bluetooth.