Nawrocki, Piotr
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Item type:Article, Access status: Open Access , Notification methods in wireless systems(Wydawnictwa AGH, 2016) Nawrocki, Piotr; Jakubowski, Mikołaj; Godzik, TomaszRecently, there has been an increasing need for secure, efficient, and simple notification methods for wireless systems. Such systems are meant to provide users with precise tools best suited for work or leisure environments, and a lot of effort has been put into creating a multitude of applications. At the same time, however, not much research has been made into determining which of the available protocols are best suited for each individual task. A number of basic notification methods are presented here, and tests have been performed for the most-promising ones. An attempt has been made to determine which of the methods have the best throughput, latency, security, and other characteristics. A comprehensive comparison is provided, which can be used to select the right method for each individual project. Finally, conclusions are provided, and the results from all of the tests conducted are discussed.Item type:Article, Access status: Open Access , Quality of experience in the context of mobile applications(Wydawnictwa AGH, 2016) Nawrocki, Piotr; Śliwa, AdrianMobile devices are among the most-popular means of browsing the Internet, sending and receiving e-mail, and sharing content on social networks. People use mobile devices and the applications installed on them in different situations throughout the day. In order to ensure that users are satisfied with a mobile application, its author has to ensure a high Quality of Experience level. The problem of automatic evaluation of the QoE parameter is a very interesting research area. Quality of Experience is a broad issue and requires the analysis of many aspects not only graphical user interfaces but also, inter alia, Quality of Service and user ratings.Item type:Article, Access status: Open Access , Public cloud computing for software as a service platforms(Wydawnictwa AGH, 2014) Soboń, Michał; Nawrocki, PiotrAs cloud computing becomes increasingly popular among enterprises, organizations, and developers, it is time to consider how Software as a Service solutions can be built rapidly and cost-effectively. This paper presents the possibility of using a service-based architecture operating within the framework of the public cloud computing model and implementing Software as a Service. It also descri- bes the architecture, implementation, and testing of sample applications. The conclusions drawn, with respect to related work and the results obtained, shed more light on the application of public cloud systems for Software as a Service purposes.Item type:Article, Access status: Open Access , Detecting gaze direction using robot-mounted and mobile-device cameras(Wydawnictwa AGH, 2019) Jarosz, Mateusz; Nawrocki, Piotr; Placzkiewicz, Leszek; Śnieżyński, Bartłomiej; Zieliński, Marcin; Indurkhya, BipinTwo common channels through which humans communicate are speech and gaze. Eye gaze is an important mode of communication: it allows people tobetter understand each others’ intentions, desires, interests, and so on. The goal of this research is to develop a framework for gaze triggered events that can be executed on a robot and mobile devices and allows to perform experiments. We experimentally evaluate the framework and techniques for extracting gaze direction based on a robot-mounted camera or a mobile-device camera that are implemented in the framework. We investigate the impact of light on the accuracy of gaze estimation, and also how the overall accuracy depends on user eye and head movements. Our research shows that light intensity is important, and the placement of a light source is crucial. All the robot-mounted gaze detection modules we tested were found to be similar with regard to their accuracy. The framework we developed was tested in a human-robot interaction experiment involving a job-interview scenario. The flexible structure of this scenario allowed us to test different components of the framework in varied real-world scenarios, which was very useful for progressing towards our long-term research goal of designing intuitive gaze-based interfaces for human robot communication.Item type:Article, Access status: Open Access , Network management services based on the OpenFlow environment(Wydawnictwa AGH, 2014) Wilk, Paweł; Nawrocki, PiotrThe subject of this article is network management through web service calls, which allows software applications to exert an influence on network traffic. In this manner, software can make independent decisions concerning the direction of requests so that they can be served as soon as possible. This is important because only proper cooperation including all architecture layers can ensure the best performance, especially when software that largely depends on computer networks and utilizes them heavily is involved. To demonstrate that the approach described above is feasible and can be useful at the same time, this article presents a switch-level load balancer developed using OpenFlow. Client software communicates with the balancer through REST web service calls, which are used to provide information on current machine load and its ability to serve incoming requests. The result is a cheap, highly customizable and extremely fast load balancer with considerable potential for further development.Item type:Article, Access status: Open Access , Distributed Web service repository(Wydawnictwa AGH, 2015) Nawrocki, Piotr; Mamla, AleksanderThe increasing availability and popularity of computer systems has resulted in a demand for new language- and platform-independent ways of data exchange. This demand has, in turn, led to significant growth in the importance of systems based on Web services. Alongside the growing number of systems accessible via Web services came the need for specialized data repositories that could offer effective means of searching the available services. The development of mobile systems and wireless data transmission technologies has allowed us to use distributed devices and computer systems on a greater scale. The accelerating growth of distributed systems might be a good reason to consider the development of distributed Web service repositories with built-in mechanisms for data migration and synchronization.