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This work presents the analysis of data recorded by an eye tracking device in the course of evaluating a foveated rendering approach for head-mounted displays (HMDs). Foveated rendering methods adapt the image synthesis process to the user’s gaze and exploiting the human visual system’s limitations to increase rendering performance. Especially, foveated rendering has great potential when certain requirements have to be fulfilled, like low-latency rendering to cope with high display refresh rates. This is crucial for virtual reality (VR), as a high level of immersion, which can only be achieved with high rendering performance and also helps to reduce nausea, is an important factor in this field. We put things in context by first providing basic information about our rendering system, followed by a description of the user study and the collected data. This data stems from fixation tasks that subjects had to perform while being shown fly-through sequences of virtual scenes on an HMD. These fixation tasks consisted of a combination of various scenes and fixation modes. Besides static fixation targets, moving tar- gets on randomized paths as well as a free focus mode were tested. Using this data, we estimate the precision of the utilized eye tracker and analyze the participants’ accuracy in focusing the displayed fixation targets. Here, we also take a look at eccentricity-dependent quality ratings. Comparing this information with the users’ quality ratings given for the displayed sequences then reveals an interesting connection between fixation modes, fixation accuracy and quality ratings.
Climate change is having drastic effects on various areas of the planet, including extreme impacts on weather and rainfall, in various Sub-Saharan East African countries (Hendrix, C. S., & Glaser, S. M. (2007). The willingness (and need) of a niche market to actively improve the damaged ecosystems in small ways is rising. Weaver and Lawton (2007, p 1170) maintain that ecotourism should satisfy three core criteria: "(1) attractions should be predominantly nature-based; (2) visitor interactions with those attractions should be focused on learning or education, and (3) experience and product management should follow principles and practices associated with ecological, socio-cultural and economic sustainability." In this study, the niche market of active German "tree-planters" is to be defined and the potential willingness to travel to, learn from and invest in the ecosystem through tree-planting, specifically in Kenya, is explored.
Das Cutting sticks-Problem ist in seiner allgemeinen Formulierung ein NP-vollständiges Problem mit Anwendungspotenzialen im Bereich der Logistik. Unter der Annahme, dass P ungleich NP (P != NP) ist, existieren keine effizienten, d.h. polynomiellen Algorithmen zur Lösung des allgemeinen Problems.
In diesem Papier werden Ansätze aufgezeigt, mit denen bestimmte Instanzen des Problems effizient berechnet werden können. Für die Berechnung wichtige Parameter werden charakterisiert und deren Beziehung untereinander analysiert.
Multiple myeloma is the second most common hematological malignancy. Despite all the progress made in treating multiple myeloma, it still remains an incurable disease. Patients are left with a median survival of 4-5 years. The combined treatment of multiple myeloma with histone deacetylase inhibitors and cytokine-induced killer cells provides a promising targeted treatment option for patients. This study investigated the impact of a combined treatment compared to treatment with histone deacetylase inhibitors. The experiments revealed that a treatment with histone deacetylase (HDAC) inhibitors could reduce cell viability to 59% for KMS 18 cell line and 46% for the U-266 cell line. The combined treatment led to a decrease of cell viability to 33% for KMS 18 and 27% for the U-266 cell line, thus showing a significantly better efficacy than the single treatment.
Comparación de perfiles de ansiedad matemática entre estudiantes mexicanos y estudiantes alemanes
(2017)
Se determinan los perfiles de ansiedad matemática de estudiantes mexicanos y estudiantes alemanes por medio de la aplicación de un cuestionario desarrollado ex profeso. La ansiedad matemática se define en términos de tres descriptores: creencias, actitudes y emociones. Los autores definen un Índice de Ansiedad Matemática, al aplicarlo encuentran que los estudiantes alemanes presentan un valor mayor de dicho Índice, lo que significa que tienen una mayor nivel de ansiedad matemática. Las diferencias en los valores del Índice de Ansiedad Matemática se interpretan en términos de diferencias culturales. La interpretación parece ser consistente con las diferencias culturales y se ajusta a los resultados obtenidos.
In Africa slowly but steadily a transformation is taking place in the management styles of enterprises. There is a trend towards more precise time management, more precision in dealing with increasingly sophisticated technology, more feedback from the bottom to the top in order to manage the processes properly, more professionalism and independence of the individual worker.
This contribution makes two points: first, neither cultures nor the so-called mental states of individuals are ever static, but always on the move. Second, the force of passion and inspiration by which particular cultural values are endorsed in a particular context makes all the difference in their impact.
The importance of these two propositions comes to the fore, if the concept of an “economic culture” is taken into consideration. The claim of the authors is that the ongoing cultural transformation can be better understood in the dynamic approach of cultural values as proposed here.
Dare – Democracy and Science
(2017)
The technological development of the digital computer and new options to collect, store and transfer mass data have changed the world in the last 40 years. Moreover, due to the ongoing progress of computer power, the establishment of the Internet as critical infrastructure and the options of ubiquitous sensor systems will have a dramatic impact on economies and societies in the future. We give a brief overview about the technological basics especially with regard to the exponential growth of big data and current turn towards sensor-based data collection. From this stance, we reconsider the various dimensions of personal data and and market mechanisms that have an impact of data usage and protection.
Gender disproportions have been part and parcel of most African cultures since time immemorial. Demographically, women are over a half population in most of the African countries but their participation in sectors of socio-economic and political spheres have remained inadequately represented. The enduring and biased beliefs on gender roles that view women much less important as compared to men are what forms the basis of concern to the welfare of women and most importantly the women entrepreneurs. This study reveals the long-standing cultural practices that have contributed to gender inequality and goes further to demystify areas in which women have continually experienced inequality and thus affecting their entrepreneurial spirit. Through the desk research methodology, it can be deduced that the following are key areas that pause a threat to women socio-economic and political development and hence the inequality being experienced even today in the twenty first century: harmful marriage, female genital mutilation, wife inheritance and HIV scourge, access to land including land rights and right to property, over-emphasizing patriarchal system of family, and gender violence. These factors compounded together, have resulted for unfortunate experiences that have been witnessed in the education sector, political participation, participation in policy making, gender division of labour and inaccess to credit facility. These experiences have severely thwarted entrepreneurial growth of women. The study therefore recommends that there is imperative need for a paradigm shift in these areas to ensure women are not only liberated and empowered but also their full participation in the entrepreneurship activities are highly strengthened and promoted.
Do remittances and social assistance transfers have different impacts on household’s expenditure patterns? While two separate strands of literature have looked at how social assistance or remittances have been spent, few studies have compared them directly. Using data from a household survey conducted in Moldova in 2011, this paper assesses the impact both types of transfers have on household expenditure patterns. Contrary to the common assumption that money is fungible, we find that social assistance and remittances have different impacts on expenditure patterns (having controlled for potential endogeneity). In other words, where the income comes from can determine how it is spent. As such, different sources of income may have different poverty impacts. In our sample, the two types of transfers are received by different, but slightly overlapping population groups. The fact that the two transfers are spent in different ways means that, to some extent, social assistance and remittances are complements rather than substitutes.
Als weltweit anspruchsvollstes Umweltmanagementsystem trägt EMAS auf Unternehmensebene als Baustein zur Nachhaltigen Entwicklung bei. EMAS ist ein Instrument der Europäischen Union, an dem Organisationen, unabhängig von ihrer Größe und Branche, weltweit auf freiwilliger Basis teilnehmen können. Die geplante EMAS-Validierung der UN-Klimakonferenz (COP 23) in Bonn (06. – 17.11.2017), hat das Interesse der Projektkoordination von „Sustainable Bonn – Konferenzort der Nachhaltigkeit“ geweckt, die EMAS-Einführung bei deren Projektteilnehmern untersuchen zu lassen. Daher liegt der Branchenfokus auf dem Gastgewerbe, aus denen die derzeitigen Teilnehmer des Bonner Projekts überwiegend stammen. Um Branchenspezifika bei EMAS besser zu berücksichtigen hat die Europäische Kommission im April 2016 hat ein Referenzdokument über bewährte Umweltmanagementpraktiken zur Steigerung der Öko-Effektivität mit einschlägigen Indikatoren zur Messung der Umweltleistung mit Richtwerten für die Tourismusbranche veröffentlicht, die im Rahmen einer EMAS-Einführung unter anderem von Gastgewerbebetrieben berücksichtigt werden müssen.
Das Cutting sticks-Problem ist in seiner allgemeinen Formulierung ein NP-vollständiges Problem mit Anwendungspotenzialen im Bereich der Logistik. Unter der Annahme, dass P ungleich NP (P != NP) ist, existieren keine effizienten, d.h. polynomiellen Algorithmen zur Lösung des allgemeinen Problems.
In diesem Papier werden für eine Reihe von Instanzen effiziente Lösungen angegeben.
This paper focuses on entrepreneurship and private sector development in Ghana with regard to the government’s initiative towards supporting private sector development through the Microfinance & Small Loans Centre (MASLOC) and the National Board for Small Scale Industries (NBSSI) initiatives to support new and existing small and medium-scale enterprises (SMEs) in diverse industries. The study addresses some of the main problems facing the two government-sponsored initiatives and issues with accessing venture capital for business start-ups in Ghana. The objective of the study is to identify possible strategies through which the MASLOC and NBSSI could be improved to serve the needs of their customers more effectively and efficiently. Enhancing the performance of these public organizations could offer many SMEs in Ghana take advantage of the new opportunities in the domestic and global business environments. The questions to be addressed are; to what extent do the activities of the NBSSI and MASLOC meet the needs of SMEs in Ghana? What challenges are associated with their services and how can management of the two organizations address the challenges they face more appropriately? The methodology is based on the qualitative and quantitative approaches, involving interviews and the administration of questionnaires and surveys to achieve the study’s objectives and goals. Based on the identified challenges, the study concludes with findings and recommendations for the management of NBSSI and MASLOC as well as entrepreneurs engaged in different SMEs in diverse industries and policy makers.
Entrepreneurship Development and New Business Challenges and Prospects for Ghanaian Entrepreneurs’
(2017)
This paper presents a framework for formulating strategies for business start-ups within the context of small and medium-scale enterprises (SMEs) in diverse industries. Using Ghana as a case study, it addresses how to increase entrepreneurs’ success rate in business ventures in developing countries. The objective of the study is to identify avenues through which entrepreneurs could address the challenges they face, and to take advantage of the emerging opportunities in the domestic and global business environments. The questions addressed are, what challenges face Ghanaian entrepreneurs’ new business start-ups and existing SME’s in developing countries? How could these challenges be addressed appropriately to make the private sector the engine of growth in Ghana’s economy? The methodology is based on the qualitative approach, involving interviews to achieve the study’s objectives. Four main themes emerged as challenges faced by the entrepreneurs business start-ups and operations which include the following: Funding availability & accessibility; Lack of planning, Skilled labour & proper management skills; Lack of competitiveness, technology innovation & customer loyalty; and finally, Legal & regulatory framework & social factors. Recommendations for entrepreneurs, policy makers, and scholars are discussed in the study.