DigitalF: Europan Campus Rottal-InnZeitschriftenartikel
Mouzhi Ge, W. Lewoniewski
Developing the Quality Model for Collaborative Open Data
Procedia Computer Science, vol. 176, pp. 1883-1892
2020
DOI: 10.1016/j.procs.2020.09.228
Abstract anzeigen
Nowadays, the development of data sharing technologies allows to involve more people to collaboratively contribute knowledge on the Web. The shared knowledge is usually represented as Collaborative Open Data (COD), for example, Wikipedia is one of the well-known sources for COD. The Wikipedia articles can be written in different languages, updated in real time, and originated from a vast variety of editors. However, COD also bring different data quality problems such as data inconsistency and low data objectiveness due to the crowd-based and dynamic nature. These data quality problems such as biased information may lead to sentimental changes or social impacts. This paper therefore proposes a new measurement model to assess the quality of COD. In order to evaluate the proposed model, A preliminary experiment is conducted with a large scale of Wikipedia articles to validate the applicability and efficiency of this proposed quality model in the real-world scenario.
DigitalF: Europan Campus Rottal-InnZeitschriftenartikel
B. Mbarek, Mouzhi Ge, T. Pitner
An Efficient Mutual Authentication Scheme for Internet of Things
Internet of Things, vol. 9, no. 1
2020
DOI: 10.1016/j.iot.2020.100160
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The Internet of Things (IoT) is developed to facilitate the connections and data sharing among people, devices, and systems. Among the infrastructural IoT techniques, Radio Frequency IDentification (RFID) has been used to enable the proliferation and communication in IoT networks. However, the RFID techniques usually suffer from security issues due to the inherent weaknesses of underlying wireless radio communications. One of the main security issues is the authentication vulnerability from the jamming attack. In order to tackle the vulnerabilities of key updating algorithms, this paper therefore proposes an efficient authentication scheme based on the self-adaptive and mutual key updating. Furthermore, we evaluate the performance and applicability of our solution with a thorough simulation by taking into account the energy consumption, authentication failure rate and authentication delay. The feasibility and applicability are demonstrated by implementing the proposed authentication scheme in smart home IoT systems.
DigitalF: Europan Campus Rottal-InnZeitschriftenartikel
M. Macak, Mouzhi Ge, B. Buhnova
A Cross-Domain Comparative Study of Big Data Architectures
International Journal of Cooperative Information Systems, vol. 29, no. 04
2020
DOI: 10.1142/S0218843020300016
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Nowadays, a variety of Big Data architectures are emerging to organize the Big Data life cycle. While some of these architectures are proposed for general usage, many of them are proposed in a specific application domain such as smart cities, transportation, healthcare, and agriculture. There is, however, a lack of understanding of how and why Big Data architectures vary in different domains and how the Big Data architecture strategy in one domain may possibly advance other domains. Therefore, this paper surveys and compares the Big Data architectures in different application domains. It also chooses a representative architecture of each researched application domain to indicate which Big Data architecture from a given domain the researchers and practitioners may possibly start from. Next, a pairwise cross-domain comparison among the Big Data architectures is presented to outline the similarities and differences between the domain-specific architectures. Finally, the paper provides a set of practical guidelines for Big Data researchers and practitioners to build and improve Big Data architectures based on the knowledge gathered in this study.
DigitalF: Europan Campus Rottal-InnZeitschriftenartikel
F. Persia, G. Pilato, Mouzhi Ge, P. Bolzoni, D. D’Auria, S. Helmer
Improving orienteering-based tourist trip planning with social sensing
Future Generation Computer Systems, vol. 110, no. 9, pp. 931-945
2020
DOI: 10.1016/j.future.2019.10.028
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We enhance a tourist trip planning framework based on orienteering with category constraints by adding social sensing. This allows us to customize a user’s experience without putting the burden of preference elicitation on the user. We identify the interests of a user by analyzing their Tweets and then match these interests to descriptions of points of interests. For this analysis we adapt different schemes for social sensing to the needs of our orienteering context and compare them to find the most suitable approach. We show that our technique is fast enough for use in real-time dynamic settings and also has a higher accuracy compared to previous approaches. Additionally, we integrate a more efficient algorithm for solving the orienteering problem, boosting the overall performance and utility of our framework further, as demonstrated by the positive user satisfaction received by real users.
DigitalF: Europan Campus Rottal-InnZeitschriftenartikel
M. Drăgoicea, L. Walletzký, L. Carrubbo, Nabil Badr, Angeliki T., F. Romanovská, Mouzhi Ge
Service Design for Resilience: A Multi-Contextual Modeling Perspective
IEEE Access, vol. 8, pp. 185526-185543
2020
DOI: 10.1109/ACCESS.2020.3029320
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This paper introduces a conceptual framework aiming to broaden the discussion on resilience for the design of public services. From a theoretical point of view, the paper explores service design with a Systems Thinking lens. A multi-contextual perspective aiming to analyze, decompose, and design smart cities services where resilience is an input at the service design level is described and the four diamondsof-context model for service design (4DocMod) is introduced. This service model accommodates various actors' contexts in public service design and consists of four design artefacts, the diamonds (See, Recognize, Organize, Do). From a practical point of view, guidelines for the application of the 4DocMod service model extension for resilience are described along with two case studies addressing the recent COVID-19 pandemic that illustrates a clear situation of resilience with insights in multiple contexts. According to the findings of this paper, it is obvious that resilience is not “just”a request. Instead, it plays a higher role within the service system. It is not “just”another Context, either. Instead, it goes through many contexts with different circumstances. In this manner, it is possible to address the qualities through which actors can become resilient, at the service design stage, to ensure continuity of the public services in times of emergency. As our approach using the 4DocMod is proposing, resilience may be is achieved when specific properties are provisioned at information service design level.
DigitalGesundF: Europan Campus Rottal-InnZeitschriftenartikel
R. Istepanian, M. Kulhandjian, Georgi Chaltikyan
Mobile Health (mHealth) in the Developing World: Two Decades of Progress or Retrogression
Journal of the International Society for Telemedicine and eHealth (JISfTeH), vol. 8, no. e24, pp. 1-5
2020
DOI: 10.29086/JISfTeH.8.e24
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Mobile healthcare, or mHealth, is one of the key pillars of information and communication technologies for healthcare that consists of telemedicine, telehealth, eHealth, and mHealth. In the past two decades, mobile health has become a transformative concept for healthcare delivery innovations on a global scale. The success was based on the market-driven strategies that utilised the advances in mobile communications, computing, and sensor technologies, especially in recent years. Those market-driven mobile health systems were also closely associated with the global proliferation of smartphones, and based on the correlated usage principle of the smartphone applications for healthcare and wellbeing. However, the global commercial success of the smartphone-based mHealth model was not widely translated into successful scaled-up and tangible healthcare benefits, especially in low- and-middle income countries, compared to the consumer mobile health markets. The numerous healthcare challenges in the developing world remained largely untackled by the existing mobile health systems and models. The much-hyped transformative benefits of these systems remain largely unfulfilled. For two decades since the inception of this concept, the majority of the population in resource-limited healthcare settings still remain in poorer health and live in worsened conditions, with limited if any access to basic healthcare services. The much-hyped mobile health services that promised transforming these fragile and limited healthcare conditions, did not come to wider fruition globally. The COVID-19 pandemic, with its devastating human and economic impact worsened this status. An overview of the origin and the basic principles of mobile health, its current landscape and status in the developing world is presented. The impact of the smartphone-centric model that dominated the landscape of mobile health systems in these countries is discussed, and a critical view on the limitation of this mobile health model adopted widely in these settings is provided.
DigitalGesundF: Europan Campus Rottal-InnZeitschriftenartikel
Fara Fernandes, Georgi Chaltikyan
Analysis of Legal and Regulatory Frameworks in Digital Health: A Comparison of Guidelines and Approaches in the European Union and United States
Journal of the International Society for Telemedicine and eHealth (JISfTeH), vol. 8, no. e11, pp. 1-13
2020
DOI: 10.29086/JISfTeH.8.e11
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The advent of digital technology in healthcare presents opportunities for the improvement of healthcare systems around the world and the move towards value-based treatment. However, this move must be accompanied by strong legal and regulatory frameworks that will not only facilitate but encourage the good use of technology. The goal of the study was to assess the amenability and furtherance of regulatory frameworks in digital health by evaluating and comparing the processes, effectiveness and outcomes of these frameworks in the European Union and United States. Methods: This study incorporated two research methodologies. The first was a research of current legal and regulatory frameworks in digital health in the European Union and United States. A comprehensive online search for publications was carried out which included laws, regulations, policies, green papers, guidelines and recommendations. This research was complemented with interviews of five purposively sampled key informants in the legal and regulatory landscape. Results: Mind-maps revealed key features and challenges of the digital health field in the topics of the current state of regulation of digital health in the EU, Germany and US, regulatory pathways for digital health devices, protection and privacy of health data, mobile health validation, risk-based classification of medical devices, regulation of clinical decision support systems, telemedicine, artificial intelligence and emerging technologies, reimbursement for digital health services and liability for digital health products. The experts expressed and explained key points where current regulation is deficient. The review of the legal frameworks revealed deficiencies which provide opportunities and recommendations to further develop and strengthen the regulatory landscape. Conclusions: A key element to a robust regulatory framework is the ability to ensure trust and confidence in using digital health technology. Technology must measure the impact on quality of life and burden of disease and not merely involve the collection of data.
DigitalF: Angewandte WirtschaftswissenschaftenBeitrag (Sammelband oder Tagungsband)
Christian Mandl
Datengetriebene Ansätze zur Optimierung der Beschaffung und Lagerhaltung von Rohstoffen in volatilen Märkten
Supply Management Research
2020
ISBN: 978-3-658-31897-0
Abstract anzeigen
Preisschwankungen stellen sowohl für rohstoffverarbeitende als auch für rohstoffhandelnde Unternehmen eine große Herausforderung dar. Die vorliegende Arbeit untersucht die Auswirkungen von Preisunsicherheit auf optimale Beschaffungs- und Lagerhaltungsstrategien. Eine zentrale Erweiterung der existierenden Literatur sind der Fokus auf Preismodellunsicherheit, sprich unvollständige Information über den zugrundeliegenden stochastischen Preisprozess, sowie auf kostenoptimale Beschaffungsentscheidungen statt optimaler Preisprognosen. Die entwickelten stochastischen und datengetriebenen Analytics-Ansätze kombinieren hierbei mathematische Optimierungsverfahren des Operations Research mit Methoden aus dem Bereich des Maschinellen Lernens und liefern als Ergebnis effektive und interpretierbare Entscheidungsregeln. Das primäre Ziel dieser Arbeit ist es, Rohstoffeinkäufern im digitalen Zeitalter Entscheidungsunterstützungstools an die Hand zu geben, mit deren Hilfe Big Data für verbesserte Beschaffungs- und Lagerhaltungsentscheidungen genutzt werden kann. Die entwickelten Algorithmen wurden dabei auf der Basis von Echtdaten für verschiedene Rohstoffklassen (Metalle, Energie, Agrar) validiert.
DigitalF: Angewandte WirtschaftswissenschaftenZeitschriftenartikel
Christian Mandl, S. Minner
Data-Driven Optimization for Commodity Procurement Under Price Uncertainty
Manufacturing and Service Operations Management, no. Published Online:18 Aug 2020
2020
DOI: 10.1287/msom.2020.0890
Abstract anzeigen
Problem definition: We study a practice-motivated multiperiod stochastic commodity procurement problem under price uncertainty with forward and spot purchase options. Existing approaches are based on parametric price models, which inevitably involve price model misspecification and generalization error. Academic/practical relevance: We propose a nonparametric, data-driven approach (DDA) that is consistent with the optimal procurement policy structure but without requiring the a priori specification and estimation of stochastic price processes. In addition to historical prices, DDA is able to leverage real-time feature data, such as economic indicators, in solving the problem. Methodology: This paper provides a framework for prescriptive analytics in dynamic commodity procurement, with optimal purchase policies learned directly from data as functions of features, via mixed integer linear programming (MILP) under cost minimization objectives. Hence, DDA focuses on optimal decisions rather than optimal predictions. Furthermore, we combine optimization with regularization from machine learning (ML) to extract decision-relevant data from noise. Results: Based on numerical experiments and empirical data, we show that there is a significant value of feature data for commodity procurement when procurement policy parameters are learned as functions of features. However, overfitting deteriorates the performance of data-driven solutions, which asks for ML extensions to improve out-of-sample generalization. Compared with an internal best-practice benchmark, DDA generates savings of on average 9.1 million euros per annum (4.33%) for 10 years of backtesting. Managerial implications: A practical benefit of DDA is that it yields simple but optimally structured decision rules that are easy to interpret and easy to operationalize. Furthermore, DDA is generalizable and applicable to many other procurement settings.
DigitalNachhaltigF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: IPH TeisnachBeitrag (Sammelband oder Tagungsband)
Simon Killinger, Johannes Liebl, Rolf Rascher
Interferometric measurement with robot kinematics
Proceedings of SPIE Optical Engineering + Applications (24 August - 04 September, 20208; Optical Manufacturing and Testing XIII; online conference), San Diego, United States, vol. 11487
2020
DOI: 10.1117/12.2568348
Abstract anzeigen
Polishing precision optics is highly depending on the operator. Hence, a good result relies on a skilled optician who controls the process chain. This process chain consists of different manual steps such as loading, cleaning and calibrating different machines. To get more control over the process and to speed up the production we currently build an operator independent polishing cell using a single robot. Therefore, we positioned the robot in the middle of the production cell, which enables the robot to reach and manipulate different tools located around the kinematic. One major issues is the lower positioning accuracy and stiffness of an industrial robot in comparison to standard optic machines. Probably the most challenging step concerning accuracy in precision optics manufacturing is the interferometric measurement. In this paper, we present a method using an ESDI Intellium H2000 interferometer, designed for use in unsteady conditions. The robot positions the surface under test without the use of any additional mechanics to enhance the accuracy. The measurement position was manually teached in and approached several times for a statistically significant evaluation. The results show that the robot is sufficiently accurate and stable to perform interferometric measurements. This is a key element towards a completely operator-independent manufacturing cell for precision optics.
DigitalF: Elektrotechnik und MedientechnikS: TSZ WeißenburgBeitrag (Sammelband oder Tagungsband)
Alireza Tajafari Sahebi, Amir Samiee, László Juhász
MRAC Implementation for Electric Throttle Valve
Proceedings of the 2020 10th International Conference on Advanced Computer Information Technologies (ACIT) [September 6-8, 2020; Deggendorf]
2020
DOI: 10.1109/ACIT49673.2020.9208929
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Design, implementation and testing of a model reference adaptive controller for an electric throttle valve are presented. An important step by design an adaptive controller is to find an adaptation mechanism. For this purpose, we employed the Lyapunov stability theory. The main challenge in this project originates from a certain term in the updating rules. This term contains the angular velocity, which is not measurable directly. Numerical differentiation of the measured angular position yields a noisy signal. To overcome this problem, we used a non-ideal derivative method. The use of a non-linear state observer based on extended Kalman filter could significantly enhance the control quality. This task is currently in progress.
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