Thomas von Bomhard
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von Bomhard
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  • Publication
    Towards Smart Individual-Room Heating for Residential Buildings
    (Springer, 2014-11-30)
    von Bomhard, Thomas
    ;
    Wörner, Dominic
    ;
    Röschlin, Marc
    Type: journal article
    Journal: Computer Science: Research and Development - Special Issue
    Volume: 2014
    Issue: 450
    URI: https://www.alexandria.unisg.ch/handle/20.500.14171/86102
  • Publication
    Design and Evaluation of a “Smart Individual Room Heating IS” to improve comfort and save energy in residential buildings
    (Boğaziçi University, 2016)
    von Bomhard, Thomas
    ;
    Wörner, Dominic
    Large amounts of energy are wasted due to unnecessary space heating in residential buildings,i.e. by heating rooms (or whole dwellings) even thoughresidents do not occupy them. Several studies have shown that the major reason for this behaviour is the poor usability and understanding of current heating controls.For that reason,most peoplealsoprefer to adapt their thermal comfort by changing clothes or opening windowsas their principal action, instead of adjusting the heating.Following the recent development of “smart” thermostats, we addressthe aforementioned challenges by developing anheating IS withbetter controls and comprehensive heating feedbackto empower residents to adapt heating radiatorsin their rooms to their needs.In this work, we present the requirement analysis, im-plementation and field test evaluation of a novel smart individual room heatingprototype.The system combines an intuitive user interface, supporting feedback and automation capabilities.We demon-stratethat such a new generation of heating controls indeed improves usability and understanding and thereby leads to lower setpoints by 2-3°Celsiuson average, which could enable significant energy savings.
    Type: conference paper
    URL: http://aisel.aisnet.org/ecis2016_prototypes/4
    URI: https://www.alexandria.unisg.ch/handle/20.500.14171/105599
  • Publication
    The Bitcoin Ecosystem: Disruption Beyond Financial Services?
    ( 2016-06-05)
    Wörner, Dominic
    ;
    von Bomhard, Thomas
    ;
    Schreier, Yan-Peter
    ;
    Bilgeri, Dominic
    The Bitcoin ecosystem has grown tremendously in recent years. While the main sectors of growth and venture capital funding have been infrastructure for the Bitcoin ecosystem itself as well as financial services, there is also a more recent evolution in sectors beyond financial services. We classify the venture-capital backed start up ecosystem accordingly and present its evolution over time. Thereby, we identify interesting sectors, i.e. digital assets, marketplaces, and notary services. Each sector is further subdivided, and six representative venture-backed start-up companies are presented in com- prehensive case studies. We extract the core innovations and Bitcoin features on which these are based. Finally, we critically discuss their disruptive potential.
    Type: conference paper
    URI: https://www.alexandria.unisg.ch/handle/20.500.14171/104255
  • Publication
    Look Twice: Uncover Hidden Information in Room Climate Sensor Data
    (IEEE, 2014-10-06)
    von Bomhard, Thomas
    ;
    Wörner, Dominic
    ;
    Röschlin, Marc
    ;
    Wortmann, Felix
    Connected sensors are on the march to become pervasive. While they are often deployed for a single purpose it is worth to take a second look. In this study, we show that the widespread Netatmo weather station which is intended to monitor and improve indoor climate can be used to estimate binary occupancy of individual rooms. We collected data from 11 rooms in 3 apartments including binary occupancy for several days. We show that CO2 measurements and derivatives thereof qualify as observables to be used in Hidden Markov Models and achieve accuracies well above 75% in most cases. However, we see that the accuracy metric is often misleading for such timeseries data and consider additional performance metrics as well which show varying results depending on the respective occupancy patterns of a room.
    Type: conference paper
    DOI: 10.1109/IOT.2014.7030110
    URI: https://www.alexandria.unisg.ch/handle/20.500.14171/86256
    Scopus© Citations 11
  • Publication
    Designing an Information System for Residential Heating and Ventilation to Improve Comfort and Save Energy
    (Springer, 2014-05-22)
    von Bomhard, Thomas
    ;
    Wörner, Dominic
    ;
    Wortmann, Felix
    ;
    Tremblay, Monica Chiarini
    ;
    VanderMeer, Debra
    ;
    Rothenberger, Marcus
    Large amounts of energy are wasted because heating systems run round-the-clock even though residents are out or occupy only a small part of their home. Major reasons for this behaviour are the non-intuitive heating controls and missing direct feedback about the heating activity or even energy consumption. In addition, bad ventilation behaviour, e.g. tilted windows, may lead to unhealthy room climate as well as significant heat losses. To address these problems, we analysed the requirements for a supporting information system. We present a first prototypical implementation of an individual-room heating and ventilation system which combines automation, an intuitive user interface and supporting feedback. This should empower residents to achieve energy-efficient heating and improved comfort.
    Type: conference paper
    Journal: Lecture Notes in Computer Science (LNCS)
    Volume: 8463
    DOI: 10.1007/978-3-319-06701-8_33
    URI: https://www.alexandria.unisg.ch/handle/20.500.14171/86953
    Scopus© Citations 1
  • Publication
    When your sensor earns money: exchanging data for cash with Bitcoin
    (ACM, 2014-09-13)
    Wörner, Dominic
    ;
    von Bomhard, Thomas
    Bitcoin is an emerging technology which allows two entities to exchange value overt the Internet without trust. Embracing that those entities could well be machines we present a system that allows a sensor to offer its measurement data directly to a world-wide data market. Based on the concept introduced in Noyen et al [1], we describe a prototypical implementation of the process of exchanging data for electronic cash between a sensor and a requester by leveraging the Bitcoin network and discuss its current limitations.
    Type: conference paper
    DOI: 10.1145/2638728.2638786
    URI: https://www.alexandria.unisg.ch/handle/20.500.14171/86349
    Scopus© Citations 79
  • Publication
    Occupancy-based heating control for residential buildings using environmental sensors
    (ACM, 2013-11-30)
    Wörner, Dominic
    ;
    von Bomhard, Thomas
    ;
    Wortmann, Felix
    Large amounts of energy is wasted in residential buildings because the heating runs round-the-clock although residents are out of home for certain times of a day. It is therefore our aim to develop a retrofit solution for dwellings that automatically detects occupancy and controls the heating accordingly. We demonstrate that consumer-oriented indoor-environmental sensors can be leveraged to infer occupancy and describe a occupancy-based heating control system on a per-room level. Furthermore, we sketch two forthcoming studies to evaluate our system in a real-world apartment.
    Type: conference paper
    DOI: 10.1145/2528282.2528313
    URI: https://www.alexandria.unisg.ch/handle/20.500.14171/88409
    Scopus© Citations 5