Sabine Janzen

Learn More
The purpose of this retrospective study was to assess the prevalence of three-rooted mandibular first molars among a German dental school patient population. A total of 800 patients' full-mouth periapical radiographs were screened, and, out of these, 524 patients possessing at least one mandibular first molar were selected. The radiographs of these cases(More)
Mobile technologies have the potential to change not only brick-and-mortar stores but also the way, how customers interact with physical products. They enable operational agility by means of improved availability and quality of information required by customers for in-store purchase decisions. In this paper, we show how an in-store bundling scenario can be(More)
The design of ambient environments does not depend on technical issues exclusively but also on social aspects. There are several design specifications for ambient environments as well as development principles for the design of such systems, a design method should address. In this paper, we survey design methodologies considering the fulfilling of the(More)
By embedding information technologies into tangible products a new class of products is created that we call smart products. Smart products use product information in product-centered communication with users. Communication of smart products is handled by dynamic product interfaces. We present a model for QA-based dynamic product interfaces and its(More)
Ambient intelligence technologies rapidly change product capabilities but also the way how users interact with physical products. This product-centered stance requires an instance-centered Product Life Cycle (iPLC) view which perceives products as autonomous actors performing in physical situations which leads to the concept of smart products. Smart(More)
Ubiquitous Information Systems (UIS) embedded in everyday environments are required to provide means for supporting complex behavioral task requirements. With the concept of a situation, we propose a knowledge level that can be used by users for understanding UIS-enhanced environments. It is discussed how the concept of situation differs from the concept of(More)
A conceptual modeling approach for Ubiquitous Information Systems (UIS) is presented as a central part of a UIS design methodology. Three conceptual models are used for step-wise derivation of machine-executable design models for distributed service infrastructures: narratives, pattern-based diagrammatic conceptual models (Pre-Artifacts), and formalized(More)
Natural Language communication between customers and products within in-store shopping environments enables new forms of product interfaces and an improved filtering and intuitive presentation of product information. In this article, we describe how customer's access to product information at the point of sale can be improved through the use of dialogue(More)
Ubiquitous Information Systems (UIS) support single actors and groups by services over ubiquitous computing technologies anywhere and anytime. These systems require design approaches that keep a holistic view of situations in which single users and groups interact with one another and with accessible services. We introduce and exemplify the Situational(More)