Kalevi Kilkki

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Music consumption is biased towards a few popular artists. For instance, in 2007 only 1% of all digital tracks accounted for 80% of all sales. Similarly, 1,000 albums accounted for 50% of all album sales, and 80% of all albums sold were purchased less than 100 times. There is a need to assist people to filter, discover, personalise and recommend from the(More)
Communications ecosystem covers a huge area from technical issues to business models and human behaviour. Due to this extreme diversity various societies need to discuss with each other, each of them using their own language. Engineers talk about network performance and quality of service, business people talk about average revenue per user and customer(More)
The basic objectives of future Internet are to increase the network capacity, to offer a practical real-time service, and to develop a feasible charging scheme. These objectives introduce very strict requirements for the trafilc control system. This paper presents a new simple approach for traffic management: Simple Integrated Media Access (SIMA). According(More)
This article provides a simple formula and a practical methodology for analyzing long tails. The same model can be applied to topics as diverse as books, search phrases, size of companies, and geographical distribution of populations. This article makes it possible for anyone to utilize the long tail concept not only as a general idea, but also as a tool to(More)
The frequent appearance of empirical rank-frequency laws, such as Zipf's law, in a wide range of domains reinforces the importance of understanding and modeling these laws and rank-frequency distributions in general. In this spirit, we utilize a simple stochastic cascade process to simulate several empirical rank-frequency distributions longitudinally. We(More)
One of the most important network elements in the Internet are the routers which do relaying of IP packets. Because of growth of the Internet routers currently experience serious problems in relaying traffic in a satisfying speed. The idea of switching Internet traffic flows has recently been introduced and a new technology called IP switching has emerged.(More)
An appropriate service for data traffic in ATM networks requires large buffers in network nodes. However, large buffers without a proper allocation scheme may lead to an unsatisfactory quality of service. Most present allocation schemes either necessitate a complicated queueing system or they do not offer a sufficient fairness. This paper describes a rather(More)
This paper presents results from performance measurements carried out in a Differentiated Services WAN connecting three major cities in Southern Finland. The target of the measurements was to collect precise information about the level of service, experienced by a user transmitting files with FTP in a network that implements service differentiation by using(More)