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  • Tönjes, Ralf (14)
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Using Attribute-Based Encryption on IoT Devices with instant Key Revocation (2019)
Fischer, Marten ; Scheerhorn, Alfred ; Tönjes, Ralf
The Internet of Things (IoT) relies on sensor devices to measure real-world phenomena in order to provide IoT services. The sensor readings are shared with multiple entities, such as IoT services, other IoT devices or other third parties. The collected data may be sensitive and include personal information. To protect the privacy of the users, the data needs to be protected through an encryption algorithm. For sharing cryptographic cipher-texts with a group of users Attribute-Based Encryption (ABE) is well suited, as it does not require to create group keys. However, the creation of ABE cipher-texts is slow when executed on resource constraint devices, such as IoT sensors. In this paper, we present a modification of an ABE scheme, which not only allows to encrypt data efficiently using ABE, but also reduces the size of the cipher-text, that must be transmitted by the sensor. We also show how our modification can be used to realise an instantaneous key revocation mechanism.
Migration and Diversity Potentials for the Labour Market (2018)
Genkova, Petia
A successful integration of migrants in the labour market and in the organisations is getting more important based on demographic changes. The central aim of the investigation is to deal with problem fields of the Human Resource Management, which arise by demographic changes regarding migration. Therefore, an explorative qualitative study with human resource managers and diversity representatives of the large DAX companies was conducted. The views of leaders and employees with and without an immigration background regarding diversity potentials in organisation are compared in this study. The results indicate that diversity is important for organisation. Employees have recognised the importance of diversity. Managers have not recognised the seriousness and urgency of cultural diversity and diversity actions. Human resource managers are not able to assess the additional stress of migrants correctly and to consider them in their day-to-day management and diversity actions.
Impact of Stays Abroad on Intercultural Competence of Students (2019)
Genkova, Petia ; Schreiber, Henrik
Aims: Intercultural competence has become a key-competence, since the world has become more and more volatile, uncertain, complex and ambiguous. Therefore, insights in the development of intercultural competence and its´ links to individual traits are crucial for companies and researchers to face the requirements in a VUCA world. This study examines the relationship between the time, students spent abroad, personality traits and circumstances during this time with the student’s intercultural competence and integration performance in the target culture. The study had a correlative cross-sectional design. Design and sample: A total of 202 academic subjects were surveyed. The average age was 22 years. There was one measuring time, to which 58 % of the participants stated that they have had a stay abroad. Measurements: Metacognitive, cognitive, motivational and behavioural intercultural competence were measured with the Cultural Intelligence Scale. The personality traits involvement, discipline, social competence, cooperation, dominance and stability were captured with the "Bochum inventory for job-related personality description-6F". Work-related attitudes as patterns of behaviour and experience were measured using the "Work-related Behaviour and Experiencing Pattern 44" (German: Arbeitsbezogene Verhaltens- und Erlebensmuster, AVEM). This scale captures the way participants relate to work in general based on the measurement of personality traits and their fit to specific clusters, which describe, whether individuals have healthy or risky patterns. In addition, the demographic factors and characteristics of stays abroad as well as the integration into the target culture based on the Sociocultural Adaption Scale were examined. The data was tested for relationships and differences by tests for mean differences, variance and regression analyses. Results: There was a positive correlation between duration and cognitive, motivational and behavioural intercultural competence. The motivational competence is higher in subjects who have no risk pattern in the AVEM. The different types of competence influence each other at diverse times. Moreover, the suggested structural equation model could be confirmed. This showed the effect of the AVEM pattern on intercultural competence, moderated by the stay abroad and the social competence. Thus, the study contributes to the understanding of both the measurement of intercultural competence and the development process of intercultural competence in a globalized world.
Diversity beliefs and Diversity Climate: Potentials for Organisations (2019)
Genkova, Petia ; Schreiber, Henrik
Do multipliers have to be more sensitized for the issue diversity? Do they have to develop specific competences? Which do they already have? These questions were analysed by a qualitative investigation. Ca. 70 interviews with managers of the large DAX companies and employees were conducted. The results show a field of tension between self-perception and perception of others and the assessment of the relevance of diversity attitudes and measures, competences and their actual implementation. The results indicate the need of promotion of competences, especially regarding the intercultural competence. We position ourselves in a functionalist perspective, in line with the work on paradigms of Burell and Morgan (2017) and Deetz (1996) in social sciences and Cross-Cultural Management. We present these results from a functionalist perspective in order to ensure the greatest possible "objectivity".
Tackling challenges in SLT-practice – Peer coaching as a problem-solving tool in the clinical reasoning process (2018)
Haupt, Christina
The increasing complexity of caseloads in SLT practice, e.g. due to higher comorbidity, lacking information or experience in the treatment of complicated cases, calls for support from experienced as well as specialist practitioners from within the field - especially for novice therapists. One way to tackle these challenges may be peer coaching and how it can be employed within the educational and professional SLT setting. Peer coaching was implemented across five semesters of a successive SLT study programme at a University of Applied Sciences in Germany. The approach was embedded in a clinical reasoning seminar with 25 SLT students who each presented a challenging case study from their current workload. All participants completed a short online survey to evaluate the feasibility of the team approach within this setting as well as their personal benefit and development re. the discussed case studies. Students felt encouraged by being able to share their experience and tackle actual challenges. They particularly valued receiving answers from a broad range of other SLTs but also contributing to other students’ queries and providing practical solutions for them. All participants felt that peer coaching was an appropriate approach for clinical reasoning to support their professional as well as personal development. Other outcomes were a perceived increased ability to employ metacognitive reflection to be used with their whole caseload but also a prospective need for further training. Some students suggested the employment of peer coaching within their work setting. In the educational as well as professional SLT setting, peer coaching can be successfully employed, triggering metacognitive reflection re. practitioner’s thinking and acting, resulting in an increased awareness of needs and skills as part of the clinical reasoning process.
Caregivers’ awareness of early language difficulties in 3- and 4-year old German children (2018)
Haupt, Christina
In Germany, a lot of young children at risk of language difficulties still go undetected or are not assessed before preschool-age. For children where parents may suspect a disorder, this practice causes a lot of emotional distress alongside lost time for intervention. Thus, what contribution can parents and nursery staff make for the earlier detection of language difficulties? 34 children from four German kindergartens were tested with a standardized preschool screening for language problems by an SLT. Parents and nursery staff completed a questionnaire (FEE 3-4) that was designed to collect potential risk-factors and included the rating of children’s abilities across the main language domains. Outcomes from the FEE 3-4 were compared between parents and nursery staff as well as triangulated with results from the standardized screening. Agreement between parents and nursery staff re. individual children’s potential language difficulties was moderate (Kappa = 0.44, p = .050). Overall, nursery staff rated children’s language abilities more strictly and precisely than parents. Especially their rating of ‘word order’ (p = .022) and ‘verb endings’ contributed significantly to the identification of potential language difficulties similar to the standardized screening. The screening identified two children at risk without caregiver's concern, but not two others who were at risk of language disorder and for whom caregivers expressed concern. Caregiver’s awareness of early language difficulties appears to be rather intuitive. Young children at risk are most reliably detected if standardized instruments are used in combination with caregiver questionnaires. Ideally, this process includes data from parents and nursery staff to be interpreted by an experienced SLT, as the use of a standardized screening alone may lead to missed or mistaken identification where essential information about the child’s environment (e.g. risk factors) is not provided. If parents are concerned about children’s language, full assessment is clearly justified.
TIGER’s Teachers Initiative: Case Studies for Health Informatics Education (2018)
Hübner, Ursula ; Procter, Paula ; Hackl, Werner ; Egbert, Nicole ; Ball, Marion
Teachers in health informatics have a broad variety of international and national educational recommendations to rely on when designing programmes, curricula, courses and educational material. However, in addition they often need very specific information for their setting, blue-prints, hands-on experience and encouragement to try something new. This workshop presents three case studies from European universities who have implemented inter-professional, technology enabled health informatics courses in undergraduate, postgraduate and open university settings. These approaches will be put into the context of the TIGER recommendation framework that includes priority ratings of health informatics competencies and case studies to illustrate them. The workshop attendees will have ample opportunity to exchange ideas with the presenters and start a mutual learning process for health informatics teachers.
Organizational Adoption of Social Media in Ethical Fashion (2018)
Jacob, Axel ; Teuteberg, Frank
This study investigates how microenterprises in Ethical Fashion (EF) retail adopt and make use of social media. Drawing on an explorative case study, supplemented by an action research approach, we first examine the antecedents of a successful Adoption based on the Technology-Organization-Environment (TOE) framework. Subsequently, we shed light on the benefits and drawbacks of social media adoption for the three microenterprises of our case study on the operational and the strategical level. More particularly, we present how they improve value creation through the employment of social media in their value networks and how they overcome the lack of a sophisticated IT infrastructure. Finally, we investigate the reluctance of the three microenterprises to adopt inter-organizational information systems. The findings of our study also reveal a halo effect in the adoption process that may mislead the adopting organization.
Demographical Change and Differences of Diversity Attitudes between Employees with and without an Immigration Background (2018)
Keysers, Pia ; Genkova, Petia
The demographic shift in the age structure has the effects that many ageing employees work in organisations. Migration can slow down the ageing of population but could not stop it. More and more people with immigration background work in organisations. Therefore, the question is, whether diversity sensitive attitudes count for all diversity aspects. The central aim of the study is to deal with the problem fields of multicultural teamwork. Thereby, the focus is on the collaboration of employees with and without immigration background. The interviews with employees with and without an immigra-tion background of various company branches were conducted. The results show that employees with an immigration background have more contact and feel comfortable with persons from different cultures than employees without an immigration back-ground. The qualitative analysis indicates that there is a high need of competence devel-opment, especially intercultural and social competences in organisations. The results of the study reveal that personality traits and characteristics of employees play a role to what extent they accept diversity and are willing to work with persons from another culture. Age is not important regarding intercultural competence development.
Film- und Alltagsszenen als Lernfeld für die mathematisch-technische Modellbildung und Simulation (2016)
Koke, Johannes
Es werden ausgewählte Beispiele und Ideen vorgestellt, die Studierende des Moduls "Modellierung und Simulation" besonders motivieren sollen, mathematisch-technische Problemstellungen wissen-schaftlich zu bearbeiten. Dabei werden Fragestellungen aus dem persönlichen Alltag, aber auch aus dem Alltag berühmter Geheimagenten behandelt. Zu diesen Projekten gehören die Erstellung geeigneter mathematischer Modelle, die Implementierung in Matlab/Simulink® sowie die Systemsimulation. Die Erfahrungen zu Motivation und Erfolg, aber auch zu Schwierigkeiten bei der Bearbeitung werden abschließend reflektiert.
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