Stefan Fischer

Universität zu Lübeck · Institut für Telematik

Gaia-X, a European initiative, aims to create a digital sovereignty framework for service ecosystems in the future internet. Its applicability to the health domain has been explored in the Gaia-X-Med project, which aimed to establish a common dataspace for various medical use cases based on Gaia-X principles. This paper presents the approach to sec...

Detecting abnormalities early by deploying a network of mobile nanosensors within the human body remains a challenging task. Current methods for abnormality detection rely on placing gateways at arbitrary locations. Given the critical importance of timely monitoring and detection in severe infections, relying on arbitrary gateway locations introduc...

The IoT encompasses objects, sensors, and everyday items not typically considered computers. IoT devices are subject to severe energy, memory, and computation power constraints. Employing NDN for the IoT is a recent approach to accommodate these issues. To gain a deeper insight into how different network parameters affect energy consumption, analyz...

This study presents an innovative deoxyribonucleic acid (DNA)-based nanonetwork designed to detect and localize abnormalities within the human body. The concept for the architecture integrates nanosensors, nanocollectors, and a gateway device, facilitating the detection and communication of disease indicators through molecular and intra-body links....

Knowledge graphs and graph databases are nowadays extensively used in various domains. However, manually creating knowledge graphs using existing ontology concepts presents significant challenges. On the other hand, chatbots are one of the most prominent technologies in the recent past. In this paper, we explore the idea of utilizing chatbots to fa...

Due to increasing digitization, the amount of data in the Internet of Things (IoT) is constantly increasing. In order to be able to process queries efficiently, strategies must, therefore, be found to reduce the transmitted data as much as possible. SPARQL is particularly well-suited to the IoT environment because it can handle various data structu...

The localization of nanobots in the human body is a crucial element to enable diagnostic ability. Current localization schemes for nanobots primarily rely on mathematical principles, but our proposed approach offers a different perspective. In this paper, we present a completely novel idea to locate nanobots within the human body by employing local...

Knowledge graphs and graph databases are nowadays exten- sively used in various domains. However, manually creating knowledge graphs using existing ontology concepts presents significant challenges. On the other hand, chatbots are one of the most prominent technologies in the recent past. In this paper, we explore the idea of utilizing chat- bots t...

DNA-based nanonetworks have a wide range of promising use cases, especially in the field of medicine. With a large set of agents, a partially observable stochastic environment, and noisy observations, such nanoscale systems can be modelled as a decentralised, partially observable, Markov decision process (DecPOMDP). As the agent set is a dominating...

One of the most important research issues in the field of nanonetworks is the problem of constructing real networks in practice. To build such networks, one needs to create the nano-devices themselves as well as a computing and a communication mechanism. We already have developed such a concept based on DNA building blocks (so called DNA tiles), wh...

One of the biggest unsolved problems in nanonetwork research is the actual construction of the components required for building such networks. Most existing ideas are limited to partial solutions of construction of nanodevices, computation within them, and communication between them. While many ideas are promising, the problem remains how to combin...

Considering both channel quality and stability may enhance the likelihood of optimum channel decision for stream-based communication. Good quality stable channels may maintain a particular quality level during data stream transmission and thereby minimize channel switching overheads such as switching delay, energy consumption, and the associated da...

Unlike the scalar data (such as temperature, pressure and humidity), the vector data (such as image, audio and video) necessitates more stringent Quality of Service (QoS) requirements in terms of bandwidth, delay, reliability and information security. These QoS requirements can be hardly achieved in a proper fashion by using a single channel for wi...

One of the main problems in nano computing and nano networking is the physical construction of nano machines. DNA is a prime candidate for nanoscale constructions because it is a chemically and structurally stable molecule. Short DNA strands can be combined to form so called DNA tiles. These tiles form the basic building blocks for bigger structure...

Akyildiz et al. envisioned the use of nanonetworks as a new paradigm for computation and communication on a very small scale. We present a new approach to implement nanonetworks with molecular communication using tile-based self-assembly systems on the basis of DNA. In this model, the medium of communication is filled with DNA-based molecules. Furt...

Traditional Wireless Sensor Networks (WSNs) are single-channel based and mainly focus on energy-efficiency and scalability. Therefore, they may readily suffer from issues such as bandwidth insufficiency, interference, jamming and so on. With the deployment of dense sensor networks and the outset of multimedia technology, the intensity of the above-...

Many family physicians have concerns about the suitability and implementation of telemedical solutions to everyday practice. A workshop was held on this topic at the 51st Congress of the German College of General Practitioners and Family Physicians (DEGAM) in Düsseldorf. In this workshop, practitioners, members of other health professions, as well...

This paper proposes and motivates a combination of different technologies to enable the construction of arbitrary three-dimensional shapes at the nanoscale with certain a"-mounts of computational power. The aforementioned technologies are tile-based self-assembly systems and quan"-tum-dot cellular automata. Both technologies are in theory capable o...

We discuss the combination of in-body nano communication with the Internet of Things (IoT) as the Internet of Nano Things (IoNT). This combination enables a wide range of new applications and opportunities – particularly in the biomedical domain – but it also entails a number of new challenges. One of many research challenges in functional and non-...

A large number of routing-related surveys are published so far for Wireless Sensor Networks (WSNs) that exhibit either complete or partial emphasis on routing in WSNs. These surveys classify and discuss the relevant routing protocols published mainly in the fields of classical, energy efficient, secure, hierarchical, geographic, intelligent, Qualit...

We are looking at the combination of in-body nano communication with the Internet of Things (IoT) -- especially Body Area Networks (BAN) -- and the resulting research challenges in the Internet of Nano Things (IoNT). Moreover, our concept for Function Centric Networking presents an approach to deal with these challenges by addressing specific group...

Wireless sensor networks (WSNs) have become more and more diversified and are today able to also support high data rate applications, such as multimedia. In this case, per-packet channel handshaking/switching may result in inducing additional overheads, such as energy consumption, delays and, therefore, data loss. One of the solutions is to perform...

In this contribution we give a rough overview of the European and particularly the German approaches to next generation networking, or more specifically Future-Internet Research and Experimentation. We can identify three different classes of projects in these approaches. The first class is related to basic research that is covered by projects withi...

Internet of Things (IoT) is changing our life for the better. IoT covers various heterogeneous devices which are sensing the environment and/or monitoring a special event in the network. These devices are mostly mobile and are wirelessly connected either to each other or to the Internet. Additionally, IoT devices run many different applications and...

The applicability of Delay Tolerant Network (DTN) routing protocols is generally quite restricted to extremely mobile environments. All nodes including terminal hosts and routers are mobile, and there is no infrastructure available. This paper presents the utilization of a scheme that combines multiple DTN regions for infrastructure-based DTN commu...

In this work, a secure wireless sensor network (WSN) for the surveillance, monitoring and protection of critical infrastructures was developed. To guarantee the security of the system, the main focus was the implementation of a unique security concept, which includes both security on the communication level, as well as mechanisms that ensure the fu...

Information-Centric Networking (ICN) is a communication paradigm for the future Internet that matches the pattern of information-oriented applications and provides in-network caching. Thanks to such properties, ICN has been recently considered as a solution for the IoT. However, IoT shows challenging features: many devices are resource-constrained...

In recent years, Vehicular Ad-Hoc Networks (VANETs) have become a very active research field. Since real-world experiments might involve potentially costly and complex hardware installations, simulations are a widely used alternative. However, due to, e.g., different scopes of functionality of available VANET simulators, simulations of VANET applic...

Named Data Networking (NDN) is a promising Information-Centric future Internet architecture. Besides its recognized potentialities as a content retrieval solution in wired domains, NDN has been also recently considered as an enabling technology for the Internet of Things (IoT), thanks to its innovative features like named-based routing and in-netwo...

Nano-communication is considered to become a major building block for many novel applications in the health care and fitness sector. Given the recent developments in the scope of nano machinery, coordination and control of these devices becomes the critical challenge to be solved. In-Body Nano-Communication based on either molecular, acoustic, or R...

To evaluate applications for Vehicular Ad-Hoc Networks (VANETs) simulations are a widely used alternative to potentially costly and complex field tests. For authentic results, simulations of realistic vehicular movement and communication environment are mandatory. Usually, a traffic simulator and a network simulator are used for the first and secon...

This poster presents the iBAST project, the goal of which is the continuous monitoring of highway bridges with sensor network technology. Currently working on a first individual solution, the long term goal of the project, though, is to move from individual case studies towards a comprehensive monitoring of bridges, by developing a monitoring syste...

Many underwater monitoring tasks, such as submarine life studies and pipeline inspections, are usually performed manually. Automated underwater monitoring has the potential to increase safety, improve timeliness, and decrease costs. We propose a hybrid solution of stationary sensor buoys and swarms of autonomous underwater vehicles (AUV) and report...

A method for determining a driving strategy for a driver of a motor vehicle includes receiving local information about a plurality of other motor vehicles using a receiving device, wherein the plurality of other motor vehicles are ahead of the motor vehicle and are relevant to the traffic situation. The method further includes recording the local i...

This paper presents a comprehensive solution to build a distributed system of medical devices in high acuity environments. It is based on the concept of a Service Oriented Medical Device Architecture. It uses the Devices Profile for Web Services as a transport layer protocol and enhances it to the Medical Devices Profile forWeb Service (MDPWS) to m...

The goal of Service-Oriented Architectures (SOA) is to enable easy cooperation of a large number of computers and orchestration of services that are connected via a network. However, SOA for wireless sensor networks (WSN) and cyber-physical systems (CPS) is still a challenging task. Consequently, for design and development of large CPS like WSNs co...

More and more people are using smartphones to gain access to the Internet. Cell phone providers are forced to expand their existing networks or slow down the Internet connection of their customers to counteract with problems concerning network congestion, which emerge from the increasing data traffic. In this paper we present an approach to cope wi...

As of today, there is a variety of self-contained vehicular ad hoc network (VANET) applications. In many scenarios, they could complement each other if they would allow for interoperability. However, since they often use different data formats and do not share a common, machine-readable and platform-independent definition of terms and semantics, th...

In this paper, we present an online platform for the field of Ambient Assisted Living (AAL) which is designed to support a selfdetermined and safe life for elderly people in their own homes instead of admission to a nursing home. This goal is achieved through in-home monitoring of the clients using wireless sensor networks in combination with a soc...

In this paper a secure wireless sensor network (WSN) developed within the MOVEDETECT project is presented. The goal of the project was to design, implement and demonstrate a secure WSN for the protection of critical infrastructure. In order to provide a reliable service, the system must detect any kind of tampering with the sensor nodes, prevent ea...

The Internet of Things (IoT) will connect billions of embedded computers that can sense and influence their environment. By integrating perception and control of the real world with data and services available on the Web, a wide range of novel applications can be realized, including Smart Cities, Smart Homes, or Smart Grids. A prerequisite for inte...

The paper proposes to re-visit a light-weight verification technique called runtime verification in the context of wireless sensor networks. The authors believe that especially an extension of runtime verification which is called runtime reflection and which is not only able to detect faults, but diagnose and even repair them, can be an important s...

Since new technologies for therapy and diagnosis are emerging in the realm of medical engineering, the density of medical devices in the operating room or the intensive care units increases continuously. Although these devices could share medically relevant data or need to be aware of patient records, only few of them are actually connected to a ne...

Sensor and actuator networks have been the focus of a lot of research for quite a number of years now, and results in these fields had a tremendous influence on computer science as a whole. Take for example the fact that energy efficiency questions have never played a major role before, and today, there are journals, conferences, and complete resea...

Virtual testbeds model them by seamlessly integrating physical, simulated, and emulated sensor nodes and radios in real time.

In the past various protocols inspired by nature and biology have been proposed to disseminate or transfer data in mobile or static ad-hoc networks. Many of them are designed for usage in wireless sensor networks or vehicular ad-hoc networks. Recently, we have developed and designed a general purpose data dissemination protocol called AutoCast in t...

In the vision of an IoT, trillions of tiny devices extend the In- ternet to the physical world and enable novel applications that have not been possible before. Such applications emerge out of the interaction of these devices with each other and with more powerful server-class com- puters on the Internet. Programming such applications is challengin...

Zusammenfassung Die experimentelle Validierung neuartiger Ansätze hat, besonders im Kontext des Internet der Dinge, stark an Bedeutung gewonnen. Dieser Beitrag identifiziert Anforderungen an Experimentaleinrichtungen für das Internet der Dinge, gibt einen Überblick über aktive und öffentlich zugängliche Experimentaleinrichtungen und stellt verschie...

Current surveys and forecast predict that the number of wireless devices is going to increase tremendously. These wireless devices can be computers of all kinds, notebooks, netbooks, Smartphones and sensor nodes that evolve into real-world scenarios forming a “Real-World-Internet” in the future. In our work we focus on the Future Internet with smal...

In this survey, we describe the state of the art for research on experimentally-driven research on networks of tiny artifacts. The main topics are existing and planned practical testbeds, software simulations, and hybrid approaches; in addition, we describe a number of current studies undertaken by the authors.

The paradigm of service-orientation promises a significant ease of use in creating and managing distributed software systems. A very important aspect here is that also application domain experts and stakeholders, who are not necessarily skilled in computer programming, get a chance to create, analyze, and adapt distributed applications. However, up...

We describe a distributed and self-regulated approach for the self-organisation of a large system of many self-driven, mobile objects, i.e., cars in traffic. Based on methods for mobile ad-hoc networks using short-distance communication between vehicles, and ideas from distributed algorithms, we consider reactions to specific traffic structures (e....

As part of our project AutoNomos, we have investigated traffic information and management systems that motivate the usage of new methods and tools inspired by Organic Computing paradigms. Current traffic monitoring and management approaches with stationary infrastructure lack flexibility with respect to system deployment and have difficulties with...

Informationstechnische Systeme sind seit einiger Zeit zwei großen Trends unterworfen. Erstens werden die Systeme selbst immer komplexer. Zwar wird das Einzelgerät immer kleiner und mobiler, um aber alle gewünschten Aufgaben erfüllen zu können, muss es sich immer stärker mit anderen Geräten vernetzen. Ein typisches Beispiel sind moderne PDAs, die ei...

We present an architecture for the interconnection of simulated sensor nodes and real node hardware. The simulator is therefore running in real-time, and the simulated nodes are able to exchange messages with real sensor nodes as if they were sent over the radio. This runs fully transparent for the application|and is well suitable for debugging pur...

In this paper we present SocialCompanion, an approach for connecting virtual and physical social networks. We point out solutions and challenges for the development of a mobile social network, which is intended to provide innovative user-centric and user-assisting services. SocialCompanion is also a learning system, which adapts to the user's needs...

The development and testing of wireless sensor networks is a cumbersome and tedious task. Therefore, a number of simulators, testbeds and other tools have been developed. Unfortunately, these tools are not able to cooperate since they have not been designed with cooperation in mind. In this paper, we present an approach to make simulation tools coo...

Now that sensor networks are gradually deployed in commercial settings, they must live up to many expectations, particularly offering both years of unattended operation and low-delay event reporting. However, experiences from real-world trials have shown that decent trade-offs between these two conflicting goals are hard to find. In this paper, we...

Wireless Sensor Networks (WSNs) are envisioned to become an integral part of the Future Internet. Together with countless other embedded appliances, such resource-constraint devices will form an Internet of Things (IoT) where all kinds of devices extend the Internet to the physical world. In this vision, the seamless and flexible integration of IoT...

Many enterprise applications can benefit from the use of wireless sensors, for example for monitoring location and state of goods. While modern backend IT systems use elaborate Service Oriented Architectures based on Web Services, the resource constraints of sensor nodes require highly optimized embedded programming and proprietary networking proto...

In recent years Wireless Sensor Networks (WSNs) have enjoyed a growing amount of attention. One particularly promising prospect is to employ WSNs as an extension of the future internet into the real world; this motivates experimentally driven research to evaluate and benchmark new concepts on WSNs. With our poster we will show our approach to virtu...

In recent years, tremendous progress has been made in understanding the dynamics of vehicle traffic flow and traffic congestion by interpreting traffic as a multiparticle system. This helps to explain the onset and persistence of many undesired phenomena, for example, traffic jams. It also reflects the apparent helplessness of drivers in traffic, w...