| 1. |
- Aitenbichler, Erwin, et al.
(författare)
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Shaping the Future Internet
- 2009
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Ingår i: <em>Proceedings of the 3rd International CompanionAble Workshop IoPTS, Brussels, 2. December 2009.</em>. - : The CompanionAble.
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Konferensbidrag (refereegranskat)abstract
- The Internet of Things (IoT) and the Internet of Services (IoS) are two well-knownexemplars of the emerging ‘Internet variants’. These variants will be tightlyinterwoven yet specific with respect to the supporting technologies needed. Thepresent paper discusses the five variants identified as essential by the authors: IoT,IoS, Internet-of-Humans, Internet-of-Crowds, and Internet-of-Clouds. For eachvariant, a non-comprehensive set of research challenges is cited and related to thestate of the art and to ongoing projects of the lab.
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| 2. |
- Beckerle, Matthias, et al.
(författare)
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Interactive Rule Learning for Access Control : Concepts and Design
- 2011
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Ingår i: International Journal on Advances in Intelligent Systems. - : International Academy, Research and Industry Association (IARIA). - 1942-2679. ; 4:3-4, s. 234-244
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Tidskriftsartikel (refereegranskat)abstract
- Nowadays the majority of users are unable toproperly configure security mechanisms mostly because theyare not usable for them. To reach the goal of having usable security mechanisms, the best solution is to minimize the amount of user interactions and simplify configuration tasks. Automation is a proper solution for minimizing the amount of user interaction. Fully automated security systems are possible for most security objectives, with the exception ofthe access control policy generation. Fully automated accesscontrol policy generation is currently not possible because individual preferences must be taken into account and, thus, requires user interaction. To address this problem we proposea mechanism that assists users to generate proper accesscontrol rule sets that reflect their individual preferences. We name this mechanism Interactive Rule Learning for AccessControl (IRL). IRL is designed to generate concise rule setsfor Attribute-Based Access Control (ABAC). The resulting approach leads to adaptive access control rule sets that can be used for so called smart products. Therefore, we first describe the requirements and metrics for usable access control rulesets for smart products. Moreover, we present the design of asecurity component which implements, among other security functionalities, our proposed IRL on ABAC. This design is currently being implemented as part of the ICT 7th Framework Programme SmartProducts of the European Commission.
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| 3. |
- Borges, Fábio, et al.
(författare)
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Analysis of privacy-enhancing protocols based on anonymity networks
- 2012
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Ingår i: Smart Grid Communications (SmartGridComm), 2012 IEEE Third International Conference on. - : IEEE. - 9781467309103 - 9781467309097 ; , s. 378-383
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Konferensbidrag (refereegranskat)abstract
- In this paper, we analyze privacy-enhancing protocols for Smart Grids that are based on anonymity networks. The underlying idea behind such protocols is attributing two distinct partial identities for each consumer. One is used to send real-time information about the power consumption, and the other for transmitting the billing information. Such protocols provide sender-anonymity for the real-time information, while consolidated data is sent for billing. In this work, the privacy properties of such protocols are analyzed, and their computational efficiencyis evaluated and compared using simulation to other solutionsbased on homomorphic encryption.
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| 4. |
- Borges, Fábio, et al.
(författare)
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Secure and Privacy-Friendly Public Key Generation and Certification
- 2014
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Ingår i: 2014 IEEE 13th International Conference on Trust, Security and Privacy in Computing and Communications. - New York : IEEE. ; , s. 114-121
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Konferensbidrag (refereegranskat)abstract
- Digital societies increasingly rely on secure communication between parties. Certificate enrollment protocols are used by certificate authorities to issue public key certificates to clients. Key agreement protocols, such as Diffie-Hellman, are used to compute secret keys, using public keys as input, for establishing secure communication channels. Whenever the keys are generated by clients, the bootstrap process requires either (a) an out-of-band verification for certification of keys when those are generated by the clients themselves, or (b) a trusted server to generate both the public and secret parameters. This paper presents a novel constrained key agreement protocol, built upon a constrained Diffie-Hellman, which is used to generate a secure public-private key pair, and to set up a certification environment without disclosing the private keys. In this way, the servers can guarantee that the generated key parameters are safe, and the clients do not disclose any secret information to the servers.
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| 5. |
- Doula, Achref, et al.
(författare)
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Immersive-Labeler : Immersive Annotation of Large-Scale 3D Point Clouds in Virtual Reality
- 2022
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Ingår i: SIGGRAPH '22. - New York, NY, USA : ACM Digital Library. ; , s. 1-2
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Konferensbidrag (refereegranskat)abstract
- We present Immersive-Labeler, an environment for the annotation of large-scale 3D point cloud scenes of urban environments. Our concept is based on the full immersion of the user in a VR-based environment that represents the 3D point cloud scene while offering adapted visual aids and intuitive interaction and navigation modalities. Through a user-centric design, we aim to improve the annotation experience and thus reduce its costs. For the preliminary evaluation of our environment, we conduct a user study (N=20) to quantify the effect of higher levels of immersion in combination with the visual aids we implemented on the annotation process. Our findings reveal that higher levels of immersion combined with object-based visual aids lead to a faster and more engaging annotation process.
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| 6. |
- Elsayed, Hesham, et al.
(författare)
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VRSketchPen : unconstrained haptic assistance for sketching in virtual 3D environments
- 2020
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Ingår i: Proceedings of the 26th ACM Symposium on Virtual Reality Software and Technology. - New York, NY, United States : Association for Computing Machinery (ACM). ; , s. 1-11
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Konferensbidrag (refereegranskat)abstract
- Accurate sketching in virtual 3D environments is challenging due to aspects like limited depth perception or the absence of physical support. To address this issue, we propose VRSketchPen – a pen that uses two haptic modalities to support virtual sketching without constraining user actions: (1) pneumatic force feedback to simulate the contact pressure of the pen against virtual surfaces and (2) vibrotactile feedback to mimic textures while moving the pen over virtual surfaces. To evaluate VRSketchPen, we conducted a lab experiment with 20 participants to compare (1) pneumatic, (2) vibrotactile and (3) a combination of both with (4) snapping and no assistance for flat and curved surfaces in a 3D virtual environment. Our findings show that usage of pneumatic, vibrotactile and their combination significantly improves 2D shape accuracy and leads to diminished depth errors for flat and curved surfaces. Qualitative results indicate that users find the addition of unconstraining haptic feedback to significantly improve convenience, confidence and user experience.
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| 7. |
- Günther, Sebastian, et al.
(författare)
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ActuBoard : An Open Rapid Prototyping Platform to integrate Hardware Actuators in Remote Applications
- 2021
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Ingår i: Companion of the 2021 ACM SIGCHI Symposium on Engineering Interactive Computing Systems. - New York, NY, USA : Association for Computing Machinery (ACM). ; , s. 70-76
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Konferensbidrag (refereegranskat)abstract
- Prototyping is an essential step in developing tangible experiences and novel devices, ranging from haptic feedback to wearables. However, prototyping of actuated devices nowadays often requires repetitive and time-consuming steps, such as wiring, soldering, and programming basic communication, before HCI researchers and designers can focus on their primary interest: designing interaction. In this paper, we present ActuBoard, a prototyping platform to support 1) quick assembly, 2) less preparation work, and 3) the inclusion of non-tech-savvy users. With ActuBoard, users are not required to create complex circuitry, write a single line of firmware, or implementing communication protocols. Acknowledging existing systems, our platform combines the flexibility of low-level microcontrollers and ease-of-use of abstracted tinker platforms to control actuators from separate applications. As further contribution, we highlight the technical specifications and published the ActuBoard platform as Open Source.
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| 8. |
- Günther, Sebastian, et al.
(författare)
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Smooth as steel wool : Effects of visual stimuli on the haptic perception of roughness in virtual reality
- 2022
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Ingår i: Proceedings of the 2022 CHI Conference on Human Factors in Computing Systems. - New York, NY, USA : Association for Computing Machinery (ACM). ; , s. 1-17
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Konferensbidrag (refereegranskat)abstract
- Haptic Feedback is essential for lifelike Virtual Reality (VR) experiences. To provide a wide range of matching sensations of being touched or stroked, current approaches typically need large numbers of different physical textures. However, even advanced devices can only accommodate a limited number of textures to remain wearable. Therefore, a better understanding is necessary of how expectations elicited by different visualizations affect haptic perception, to achieve a balance between physical constraints and great variety of matching physical textures.In this work, we conducted an experiment (N=31) assessing how the perception of roughness is affected within VR. We designed a prototype for arm stroking and compared the effects of different visualizations on the perception of physical textures with distinct roughnesses. Additionally, we used the visualizations’ real-world materials, no-haptics and vibrotactile feedback as baselines. As one result, we found that two levels of roughness can be sufficient to convey a realistic illusion.
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| 9. |
- Hein, Patrick, et al.
(författare)
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Conflict Detection and Lifecycle Management for Access Control in Publish/Subscribe Systems
- 2011
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Ingår i: High-Assurance Systems Engineering (HASE), 2011 IEEE 13th International Symposium on. - : IEEE Press. - 9781467301077 ; , s. 104-111
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Konferensbidrag (refereegranskat)abstract
- In today's collaborative business environment there is a need to share information across organizational boundaries. Publish/Subscribe systems are ideal for such scenarios as they allow real-time information to be shared in an asynchronous fashion. In this work, we focus on the access control aspect. While access control in general for publish/subscribe systems has been studied before, their usage in a multi-organizational scenario leads to some novel challenges. Here a publisher might wish to enforce restrictions w.r.t. not only subscribers, but also other publishers publishing certain event types due to competitive or regulatory reasons. With different publishers and subscribers having their own preferences and restrictions, conflicts are evident w.r.t. both publishing and subscribing to specific event types. Given this, the first contribution of this work is to provide efficient conflict detection and resolution algorithms. The other important (and often ignored) aspect of large scale and evolving systems is that of efficiently handling modifications to existing policies, e.g. a rule may become invalid after a certain period of time. Our approach in handling such modifications is two-fold: (i) to maintain consistency and (ii) to automatically detect and enforce rules which could not have been enforced earlier due to conflicts. The second contribution of our work is thus to provide lifecycle management for access control rules, which is tightly coupled with the conflict detection and resolution algorithms.
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| 10. |
- Kosch, Thomas, et al.
(författare)
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NotiBike : Assessing Target Selection Techniques for Cyclist Notifications in Augmented Reality
- 2022
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Ingår i: Proceedings of the ACM on Human-Computer Interaction. - : Association for Computing Machinery (ACM). - 2573-0142. ; 6:MHCI, s. 1-24
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Tidskriftsartikel (refereegranskat)abstract
- Cyclists' attention is often compromised when interacting with notifications in traffic, hence increasing the likelihood of road accidents. To address this issue, we evaluate three notification interaction modalities and investigate their impact on the interaction performance while cycling: gaze-based Dwell Time, Gestures, and Manual And Gaze Input Cascaded (MAGIC) Pointing. In a user study (N=18), participants confirmed notifications in Augmented Reality (AR) using the three interaction modalities in a simulated biking scenario. We assessed the efficiency regarding reaction times, error rates, and perceived task load. Our results show significantly faster response times for MAGIC Pointing compared to Dwell Time and Gestures, while Dwell Time led to a significantly lower error rate compared to Gestures. Participants favored the MAGIC Pointing approach, supporting cyclists in AR selection tasks. Our research sets the boundaries for more comfortable and easier interaction with notifications and discusses implications for target selections in AR while cycling.
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