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Ickin, Selim
Publications (10 of 13) Show all publications
Ickin, S., Petersen, K. & Gonzalez-Huerta, J. (2017). Why do users install and delete apps?: A survey study. In: Lecture Notes in Business Information Processing: . Paper presented at 8th International Conference on Software Business, (ICSOB), Essen (pp. 186-191). Springer Verlag, 304
Open this publication in new window or tab >>Why do users install and delete apps?: A survey study
2017 (English)In: Lecture Notes in Business Information Processing, Springer Verlag , 2017, Vol. 304, p. 186-191Conference paper, Published paper (Refereed)
Abstract [en]

Practitioners on the area of mobile application development usually rely on set of app-related success factors, the majority of which are directly related to their economical/business profit (e.g., number of downloads, or the in-app purchases revenue). However, gathering also the user-related success factors, that explain the reasons why users choose, download, and install apps as well as the user-related failure factors that explain the reasons why users delete apps, might help practitioners understand how to improve the market impact of their apps. The objectives were to: identify (i) the reasons why users choose and installing mobile apps from app stores; (ii) the reasons why users uninstall the apps. A questionnaire-based survey involving 121 users from 26 different countries was conducted. © Springer International Publishing AG 2017.

Place, publisher, year, edition, pages
Springer Verlag, 2017
Series
Lecture Notes in Business Information Processing, ISSN 1865-1348 ; 304
Keywords
Failure factors, Mobile application development, Success factors, Users survey, Mobile computing, Mobile telecommunication systems, App stores, Market impacts, Mobile apps, Surveys
National Category
Software Engineering
Identifiers
urn:nbn:se:bth-15613 (URN)10.1007/978-3-319-69191-6_13 (DOI)000437038300013 ()2-s2.0-85034246129 (Scopus ID)9783319691909 (ISBN)
Conference
8th International Conference on Software Business, (ICSOB), Essen
Available from: 2017-12-07 Created: 2017-12-07 Last updated: 2018-08-20Bibliographically approved
Ickin, S. & Fiedler, M. (2016). Quality of Experience on Smartphones: Network, Application, and Energy Perspectives. In: : . Paper presented at Innovations in Clouds, Internet and Networks (ICIN), Paris.
Open this publication in new window or tab >>Quality of Experience on Smartphones: Network, Application, and Energy Perspectives
2016 (English)Conference paper, Published paper (Refereed)
Abstract [en]

For service and mobile operators, it is importantto monitor and keep high user engagement levels. Qualityof Experience (QoE) on video streaming applications is animportant engagement measure for video consumer customers.In this paper, video QoE (with the focus on stalling events)is studied from network, application, and energy perspectiveswith various instrumentations on a smartphone. This enablesthe understanding of inter-relation between the perspectives andalso how they influence the video QoE. Results show that packetdelay variation and the maximal burst size in the network level;inter-picture time (picture delay) in the application layer; andalso fluctuations in the energy consumptions are strong indicatorsfor QoE. We show, via extensive QoE and energy measurementson smartphones that, based on the choice of streaming protocol,energy consumption can be reduced or increased in the case ofstalling events during a video stream.

Keywords
QoE, QoS, Energy, Mobile, Video
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:bth-15636 (URN)
Conference
Innovations in Clouds, Internet and Networks (ICIN), Paris
Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2018-05-23Bibliographically approved
Ickin, S. (2015). Quality of Experience on Smartphones: Network, Application, and Energy Perspectives. (Doctoral dissertation). Karlskrona: Blekinge Institute of Technology
Open this publication in new window or tab >>Quality of Experience on Smartphones: Network, Application, and Energy Perspectives
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Smartphones have become crucial enablers for users to exploit online services such as learning, leisure, communicating, and socializing. The user-perceived quality of applications and services is an important factor to consider, in order to achieve lean resource management, to prevent user churn and revenue depletion of service or network providers. This is often studied within the scope of Quality of Experience (QoE), which has attracted researchers both in academia and industry. The objective of this thesis is to study the most important factors influencing QoE on smartphones and synthesize solutions for intervention. The temporal impairments during a real-time energy-hungry video streaming are studied. The aim is to quantify the influence of temporal impairments on the user-perceived video QoE at the network and application level together with energy measurements, and also to propose solutions to reduce smartphone energy consumption without degrading the user’s QoE on the smartphone for both user-interactive, e.g., video, and non-interactive cases. QoE measurements on smartphones are performed throughout in-the-wild user studies. A set of quantitative Quality of Experience (QoE) assessment tools are implemented and deployed for automatic data logging at the network- and application-level. Online momentary survey, Experience Sampling Method (ESM) software, and Day Reconstruction Method (DRM) along weekly face-to-face user interviews are employed. The subjective QoE is obtained through qualitative feedback including Mean Opinion Score (MOS) as well as in-situ indications of poor experiences by users. Additionally, energy measurements on smartphones are conducted in controlled-lab environment with the Monsoon device. The QoE of smartphone applications and services perceived by users depends on many factors including anomalies in the network, application, and also the energy consumption. At the network-level, high packet delay variation causes long video freezes that eventually impact negatively the end-user perceived quality. The freezes can be quantified as large time gaps in-between the displayed pictures during a video stream at the application-level. We show that the inter-picture time in cellular-based video stream can be represented via two-state exponential ON/OFF models. We show models representing the non-linear relationship between the QoE and the mean inter-picture time. It is shown that energy measurements help to reveal the temporal impairments in video stream enabling energy consumption as a QoE indicator. Next, energy waste and saving during temporal impairments are identified. Additionally, other video streaming use cases, e.g., “download first and watch later”, are studied and appropriate energy-saving download scheduling mechanisms are recommended. The possibility for decreasing energy consumption when the smartphone screen is OFF, while maintaining QoE, is revealed. We first show exponential models to represent user’s interaction with smartphone, then propose a NyxEnergySaver software, to control the cellular network interface in a personalized manner to save smartphone energy. According to our findings, more than 30% smartphone energy can be saved without impacting the user-perceived QoE.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Institute of Technology, 2015. p. 254
Series
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 6
Keywords
QoE, QoS, Energy, Mobile computing
National Category
Telecommunications Human Aspects of ICT Computer Sciences
Identifiers
urn:nbn:se:bth-00615 (URN)oai:bth.se:forskinfo8AA7174FBA350067C1257E2A00451EC0 (Local ID)978-91-7295-303-1 (ISBN)oai:bth.se:forskinfo8AA7174FBA350067C1257E2A00451EC0 (Archive number)oai:bth.se:forskinfo8AA7174FBA350067C1257E2A00451EC0 (OAI)
External cooperation:
Available from: 2015-05-08 Created: 2015-04-17 Last updated: 2018-01-11Bibliographically approved
Ickin, S., Fiedler, M., Wac, K., Arlos, P., Temiz, C. & Mkocha, K. (2015). VLQoE: Video QoE instrumentation on the smartphone. Multimedia tools and applications, 74(2), 381-411
Open this publication in new window or tab >>VLQoE: Video QoE instrumentation on the smartphone
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2015 (English)In: Multimedia tools and applications, ISSN 1380-7501, E-ISSN 1573-7721, Vol. 74, no 2, p. 381-411Article in journal (Refereed) Published
Abstract [en]

The usage of network-demanding applications is growing rapidly such as video streaming on mobile terminals. However, network and/or service providers might not guarantee the perceived quality for video streaming that demands high packet transmission rate. In order to satisfy the user expectations and to minimize user churn, it is important for network operators to infer the end-user perceived quality in video streaming. Today, the most reliable method to obtain end-user perceived quality is through subjective tests, and the preferred location is the user interface as it is the closest point of application to the end-user. The end-user perceived quality on video streaming is highly influenced by occasional freezes; technically the extraordinary time gaps between two consecutive pictures that are displayed to the user, i.e., high inter-picture time. In this paper, we present a QoE instrumentation for video streaming, VLQoE. We added functionality to the VLC player to record a set of metrics from the user interface, application-level, network-level, and from the available sensors of the device. To the best of our knowledge, VLQoE is the first tool of its kind that can be used in user experiments for video streaming. By using the tool, we present a two state model based on the inter-picture time, for the HTTP- and RTSP-based video streaming via 3.5G. Next, we studied the influence of inter-picture time on the user perceived quality through out a user study. We investigated the minimum user perceived inter-picture time, and the user response time.

Place, publisher, year, edition, pages
Springer, 2015
Keywords
QoE (Quality of Experience), QoS (Quality of Service), Smartphone, Video, User interface, Human Computer Interaction (HCI)
National Category
Human Aspects of ICT Computer Sciences Media and Communications
Identifiers
urn:nbn:se:bth-6316 (URN)10.1007/s11042-014-1919-0 (DOI)000348445300005 ()oai:bth.se:forskinfo095163BDD4E8ABE6C1257CAF007391CD (Local ID)oai:bth.se:forskinfo095163BDD4E8ABE6C1257CAF007391CD (Archive number)oai:bth.se:forskinfo095163BDD4E8ABE6C1257CAF007391CD (OAI)
Note

http://link.springer.com/article/10.1007%2Fs11042-014-1919-0

Available from: 2015-05-26 Created: 2014-04-03 Last updated: 2018-01-11Bibliographically approved
Ickin, S., Zinner, T., Wac, K. & Fiedler, M. (2014). Catching the download train: Energy-efficient file downloading on smartphones. In: : . Paper presented at 26th International Teletraffic Congress (ITC), Karlskrona. IEEE
Open this publication in new window or tab >>Catching the download train: Energy-efficient file downloading on smartphones
2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The most energy-consuming applications in battery life-constrained smartphones are the ones that comprise data transmission, especially via the 3G interface. Scheduling download activities on smartphones is especially necessary, if there are multiple asynchronous downloads scattered over a long duration. The latter scenario highly increases the energy consumption of smartphones. In this paper, we investigate energy consumption with the focus on file downloading while scheduling multiple file downloads in two scenarios: serialized and parallel. We repeat the experiments on a single smartphone via its 3G and also via WiFi tethering via another smartphone. We assess the performance of the two scenarios via measurement of power consumption and corresponding download duration in a realistic environment.

Place, publisher, year, edition, pages
IEEE, 2014
Keywords
Energy, Smartphone, Wireless
National Category
Telecommunications Social Sciences Interdisciplinary Computer Sciences
Identifiers
urn:nbn:se:bth-6348 (URN)10.1109/ITC.2014.6932965 (DOI)000349470200037 ()978-0-9836283-9-2 (ISBN)
Conference
26th International Teletraffic Congress (ITC), Karlskrona
Available from: 2015-05-26 Created: 2014-10-29 Last updated: 2018-01-11Bibliographically approved
Ickin, S., Fiedler, M. & Wac, K. (2013). Energy-based Anomaly Detection in Quality of Experience. In: : . Paper presented at Green Cognitive Radio Access Networks, International Symposium on Wireless Personal Multimedia Communications. New Jersey: IEEE
Open this publication in new window or tab >>Energy-based Anomaly Detection in Quality of Experience
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Subjective performance of smartphone-based high bandwidth- and energy-demanding applications and services such as video streaming, are highly influenced by the temporal impairments perceived by the user at the user interface; and the application's energy consumption patterns. Therefore, we study the influence of the anomalies detected by objective measurements from the user interface and the network-level, on the power consumption during video streaming on the smartphone. In this paper, we study the inter-frame time metric, i.e., the time gap between two consecutive displayed pictures at the user interface; the inter-packet time and the initial signaling duration at the network-level; and the instantaneous power consumption at the power supply of the smartphone. We conduct experiments on the VLC media player, while streaming video via local-storage; via 3G using RTSP protocol; and via 3G using HTTP protocol. We show that the anomalies detected at the instantaneous power consumption reveals the anomalies at the user interface and the network-level.

Place, publisher, year, edition, pages
New Jersey: IEEE, 2013
Keywords
QoE, Energy, QoS, Video streaming
National Category
Telecommunications Computer Sciences
Identifiers
urn:nbn:se:bth-6669 (URN)000332186700085 ()oai:bth.se:forskinfo7A8D8191C65A3C08C1257BC7002D54FB (Local ID)oai:bth.se:forskinfo7A8D8191C65A3C08C1257BC7002D54FB (Archive number)oai:bth.se:forskinfo7A8D8191C65A3C08C1257BC7002D54FB (OAI)
External cooperation:
Conference
Green Cognitive Radio Access Networks, International Symposium on Wireless Personal Multimedia Communications
Available from: 2014-07-17 Created: 2013-08-14 Last updated: 2018-01-11Bibliographically approved
Gustarini, M., Ickin, S. & Wac, K. (2013). Evaluation of Challenges in Human Subject Studies “In-the-Wild” Using Subjects’ Personal Smartphones. In: : . Paper presented at 2nd International Workshop on Ubiquitous Mobile Instrumentation. Zurich, Switzerland
Open this publication in new window or tab >>Evaluation of Challenges in Human Subject Studies “In-the-Wild” Using Subjects’ Personal Smartphones
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The experimental setting of Human Mobile Computer Interaction (HCI) studies is moving from the controlled laboratory to the user’s daily-life environments, while employing the users’ own smartphones. These studies are challenging for both new and expert researchers in human subject studies in the HCI field. Within the last three years, we conducted three different smartphone- based user studies. From these studies, we have derived key challenges that we successfully overcame during their execution. In this paper, we present the outcomes and explain the adopted solutions for the challenges identified in the design, development and execution, and data analysis phases during the user studies. Our goal is to give newcomers and junior researchers a practical view on our conducted studies, and help practitioners to reflect on their own studies and possibly apply the proposed solutions.

Place, publisher, year, edition, pages
Zurich, Switzerland: , 2013
National Category
Computer Sciences Human Aspects of ICT
Identifiers
urn:nbn:se:bth-6914 (URN)oai:bth.se:forskinfo50F86AB17523E578C1257BC7002ED895 (Local ID)oai:bth.se:forskinfo50F86AB17523E578C1257BC7002ED895 (Archive number)oai:bth.se:forskinfo50F86AB17523E578C1257BC7002ED895 (OAI)
External cooperation:
Conference
2nd International Workshop on Ubiquitous Mobile Instrumentation
Available from: 2013-08-30 Created: 2013-08-14 Last updated: 2018-01-11Bibliographically approved
Ickin, S. (2013). Identification of Influential Factors on Android Smartphone-Based Video Quality of Experience. (Licentiate dissertation). Karlskrona: Blekinge Institute of Technology
Open this publication in new window or tab >>Identification of Influential Factors on Android Smartphone-Based Video Quality of Experience
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Mobile handheld devices have become friends in people’s daily lives. Frequent usage of available applications, especially video streaming, causes exponential growth in mobile IP traffic. Service providers and application developers need to know the tradeoff between the end-to-end (e2e) performance and cost since, not fully met expectations of customers from those applications cause reduced usage of services, revenue, and growth in the churn rate. The user-centric approach, which involves users into the assessment of the performance of a particular service or application, has become important within the inter-disciplinary research field Quality of Experience (QoE). The ultimate goal is to obtain simplified QoE models on particular applications based on the underlying network-based performance metrics as well as other non-technical metrics related to the end-user. Android smartphones that use open-source code and well-documented Application Programming Interfaces (API), facilitate researchers to do low-level and network-based performance analysis on end-user mobile devices while considering user feedback. In this thesis, the influential factors for Android smartphone-based QoE are studied. The relation between the quantified user-perceived QoE metric, i.e., Mean Opinion Score (MOS), and the artifacts in real-time video streaming such as blockiness and jerkiness caused by network-level metrics, e.g., Packet Delay Variation (PDV), Maximal Burst Size (MBS), and video bit rate are identified. Challenges in assessing the user-perceived QoE of video with the focus on memory effects are discussed. The relation between the objective metric of user reaction time and the user-perceived QoE is presented. Furthermore, different methods to assess end-user-perceived QoE such as Day Reconstruction Method (DRM), Experience Sampling Method (ESM), and preliminary online survey are described. Further influential factors, e.g., context, user routines, user lifestyle, and Quality of Service (QoS) metrics such as Round Trip Time (RTT) and Server Response Time (SRT), are studied. The thesis is concluded with preliminary findings that relate the instantaneous total power consumption to the jerkiness of a real-time video stream with evidences such as stalling events.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Institute of Technology, 2013
Series
Blekinge Institute of Technology Licentiate Dissertation Series, ISSN 1650-2140 ; 1
National Category
Telecommunications Human Aspects of ICT Computer Sciences
Identifiers
urn:nbn:se:bth-00547 (URN)oai:bth.se:forskinfoBE723AC0D73C9530C1257AF70044DEA2 (Local ID)978-91-7295-246-1 (ISBN)oai:bth.se:forskinfoBE723AC0D73C9530C1257AF70044DEA2 (Archive number)oai:bth.se:forskinfoBE723AC0D73C9530C1257AF70044DEA2 (OAI)
Available from: 2013-02-08 Created: 2013-01-18 Last updated: 2018-01-11Bibliographically approved
Ickin, S., Wac, K. & Fiedler, M. (2013). QoE-Based Energy Reduction by Controlling the 3G Cellular Data Traffic on the Smartphone. In: : . Paper presented at 22nd International Teletraffic Congress Specialist Seminar on Energy Efficient and Green Networking. Christchurch, New Zealand
Open this publication in new window or tab >>QoE-Based Energy Reduction by Controlling the 3G Cellular Data Traffic on the Smartphone
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

One of the most influencing factors on the overall end-user perceived quality from applications and services, i.e., QoE, running on the smartphones is their limited battery life. Particular cloud-based applications/services on the smartphone with a constrained battery life might consume high energy even when the smartphone is in screen-OFF state. The cellular radio module of the smartphone is one of the most power-consuming components, which depends on the running applications' information polling characteristics that eventually cause the radio module to toggle occasionally between the cellular data energy states even during a sleep state. In this paper, we investigate the energy consumption of a set of applications that tend to retain up-to-date information via aggressive polling patterns. We show that limiting the network traffic and increasing the resource utilization efficiency amongst the applications and services can highly reduce the total energy consumption. We control the network activity of a smartphone with different cellular data-enabled and data-disabled durations at the screen-OFF state. First, we run controlled-lab energy measurements to have a ground truth on the power consumption patterns of a set of cloud-based popular applications/services; and next we conduct a subjective study with our proposed solution (ExpCO2), to understand first the user behaviour on the smartphone and then present how the reduced polling intervals of applications and notifications influence the end-user perceived quality. We indicate that ExpCO2 has a potential to save energy.

Place, publisher, year, edition, pages
Christchurch, New Zealand: , 2013
Keywords
Energy, QoE, HCI, User Experience
National Category
Telecommunications Computer Sciences
Identifiers
urn:nbn:se:bth-6653 (URN)000335513500003 ()oai:bth.se:forskinfo64C005B18E641C7FC1257BC7002E0D1F (Local ID)978-1-4799-0977-3 (ISBN)oai:bth.se:forskinfo64C005B18E641C7FC1257BC7002E0D1F (Archive number)oai:bth.se:forskinfo64C005B18E641C7FC1257BC7002E0D1F (OAI)
External cooperation:
Conference
22nd International Teletraffic Congress Specialist Seminar on Energy Efficient and Green Networking
Available from: 2014-07-17 Created: 2013-08-14 Last updated: 2018-01-11Bibliographically approved
Ickin, S., Fiedler, M. & Wac, K. (2012). Demonstrating the Stalling Events with Instantaneous Total Power Consumption in Smartphone-based Live Video Streaming. In: : . Paper presented at The Second IFIP Conference on Sustainable Internet and ICT for Sustainability. Pisa, Italy: IEEE
Open this publication in new window or tab >>Demonstrating the Stalling Events with Instantaneous Total Power Consumption in Smartphone-based Live Video Streaming
2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The smartphone usage nearly tripled 2011 according to Cisco Virtual Networking Index. There is a high demand of energy for using popular mobile applications, which run on smartphones with limited battery life. Video streaming applications are widely used on mobile devices, and their high power consumption exhibits high variance during a live streaming session, due to varying conditions on network and application levels. Recent studies focus on the averaged power consumption statistics, while there is lack of observation on the fluctuations of the instantaneous total power consumption of the smart- phones. Network based applications consume power at all layers of the communication stack, and any fluctuation in the total power consumption during a video streaming can reveal a possible misbehaviour such as a stalling event. Until now, these events are investigated in Quality of Experience (QoE) studies through installation of high-energy demanding and hard-to-deploy network measurement tools on users’ mobile devices. In this paper, we demonstrate an ex- periment, where a user experiences a stalling event on the smartphone and observes the live instantaneous power consumption values through Mobile Power Monitoring Tool (MPMT) and Software Visualisa- tion Tool (SVT), simultaneously. We confer that the instantaneous total power consumption likely reveals the misbehaviours such as stalls during a video play- out in live video streaming on smartphones that can facilitate energy efficient QoE studies.

Place, publisher, year, edition, pages
Pisa, Italy: IEEE, 2012
Keywords
Power consumption, energy efficient, stalling, video streaming, visualisation tool
National Category
Social Sciences Interdisciplinary Telecommunications Computer Sciences
Identifiers
urn:nbn:se:bth-7232 (URN)oai:bth.se:forskinfo643F9E6664110015C1257A5A00528FC5 (Local ID)oai:bth.se:forskinfo643F9E6664110015C1257A5A00528FC5 (Archive number)oai:bth.se:forskinfo643F9E6664110015C1257A5A00528FC5 (OAI)
Conference
The Second IFIP Conference on Sustainable Internet and ICT for Sustainability
Available from: 2012-10-29 Created: 2012-08-14 Last updated: 2018-01-11Bibliographically approved
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