"Hämäläinen, Timo" - Selaus tekijän mukaan Julkaisut

    • A model of cyber threat information sharing with the novel network topology 

      Hautamäki, Jari; Hämäläinen, Timo (Association for computing machinery, 2021)
      The digitized environments are particularly vulnerable to various attacks. In such a situation of a security attack, detecting and responding to attacks require effective actions. One of the most significant ways to improve ...
    • Analysis of approaches to Internet traffic generation for cyber security research and excercise 

      Kokkonen, Tero; Hämäläinen, Timo; Silokunnas, Marko; Siltanen, Jarmo; Zolotukhin, Mikhail; Neijonen, Mikko
      Lecture Notes in Computer Science (Springer, 2015)
      Because of the severe global security threat of malwares, vulnerabilities and attacks against networked systems cyber-security research, training and exercises are required for achieving cyber resilience of organizations. ...
    • Compression methods for microclimate data based on linear approximation of sensor data 

      Väänänen, Olli; Hämäläinen, Timo (Springer, 2019)
      Edge computing is currently one of the main research topics in the field of Internet of Things. Edge computing requires lightweight and computationally simple algorithms for sensor data analytics. Sensing edge devices are ...
    • Cyber security exercise – literature review to pedagogical methodology 

      Hautamäki, Jari; Karjalainen, Mika; Häkkinen, Päivi; Hämäläinen, Timo
      INTED proceedings : 13 (International Association of Technology Education and Development, 2019)
    • Distribution of Invalid Users on an SSH Server 

      Rasmus, Kai; Kokkonen, Tero; Hämäläinen, Timo
      Lecture notes in networks and systems (Springer Nature, 2024)
      The Secure Shell (SSH) server on a Unix-like system is a viable way for users to login and execute programs on the system remotely. Remote access is something that hackers also want to achieve, making SSH servers a target ...
    • Efficiency of temporal sensor data compression methods to reduce LoRa-based sensor node energy consumption 

      Väänänen, Olli; Hämäläinen, Timo
      Sensor Review : 5 (Emerald, 2022)
      Purpose – Minimizing the energy consumption in a wireless sensor node is important for lengthening the lifetime of a battery. Radio transmission is the most energy-consuming task in a wireless sensor node, and by compressing ...
    • Linear approximation based compression algorithms efficiency to compress environmental data sets 

      Väänänen, Olli; Zolotukhin, Mikhail; Hämäläinen, Timo (Springer, 2020)
      Measuring some environmental magnitudes is a very typical application in the field of Internet of Things. Wireless sensor nodes measuring these environmental magnitudes are often battery powered devices. Thus, the energy ...
    • Linearity-based Sensor Data Online Compression Methods for Environmental Applications 

      Väänänen, Olli; Hämäläinen, Timo
      2023 6th Conference on Cloud and Internet of Things (CIoT) (IEEE, 2023)
      Environmental monitoring is a typical Internet of Things (IoT) application. Environmental monitoring plays a significant role, for example, in smart farming and smart city applications. Environmental magnitudes are usually ...
    • LoRa-Based Sensor Node Energy Consumption with Data Compression 

      Väänänen, Olli; Hämäläinen, Timo (Institute of Electrical and Electronics Engineers, 2021)
      In this paper simple temporal compression algorithms' efficiency to reduce LoRa-based sensor node energy consumption has been evaluated and measured. It is known that radio transmission is the most energy consuming operation ...
    • On Application Layer DDoS Attack Detection in High-Speed Encrypted Networks 

      Zolotukhin, Mikhail; Kokkonen, Tero; Hämäläinen, Timo; Siltanen, Jarmo (Advanced Institute of Convergence IT, 2016)
      Application-layer denial-of-service attacks have become a serious threat to modern high-speed computer networks and systems. Unlike network-layer attacks, application-layer attacks can be performed by using legitimate ...
    • Predictive pumping based on sensor data and weather forecast 

      Väänänen, Olli; Hautamäki, Jari; Hämäläinen, Timo (Institute of Electrical and Electronics Engineers, 2019)
      In energy production, peat extraction has a significant role in Finland. However, protection of nature has become more and more important globally. How do we solve this conflict of interests respecting both views? In peat ...
    • Refining Cyber Situation Awareness with Honeypots in Case of a Ransomware Attack 

      Ihanus, Jouni; Kokkonen, Tero; Hämäläinen, Timo
      Lecture notes in networks and systems (Springer, 2024)
      The cyber threat landscape is vast and unstable. One of the top threats in the present moment is ransomware, which is constantly spreading in prevalence. To protect organisations’ cyber operating environment, ability to ...
    • Requirements for energy efficient edge computing: a survey 

      Väänänen, Olli; Hämäläinen, Timo
      Lecture notes in computer science (Springer, 2018)
      Internet of Things is evolving heavily in these times. One of the major obstacle is energy consumption in the IoT devices (sensor nodes and wireless gateways). The IoT devices are often battery powered wireless devices and ...
    • Sensor data stream on-line compression with linearity-based methods 

      Väänänen, Olli; Hämäläinen, Timo (IEEE Computer Society, 2020)
      The escalation of the Internet of Things applications has put on display the different sensor data processing methods. The sensor data compression is one of the fundamental methods to reduce the amount of data needed to ...