Silica ferric hydrogensulfate is an efficient heterogeneous catalyst for the cyclization of 2- aminochalcones to the corresponding 2,3-dihydroquinolin- 4(1H)-ones. This intramolecular aza Michael reaction was carried out in high yields using chalcones bearing of electron donating and electron withdrawing groups. The catalyst is reusable without significant decreases in its activity after four t...

Aspect-oriented software development still lacks practical evidence. While aspects are claimed to be useful in adapting existing applications there is also first evidence that they might themselves be re-usable. We present results from two case studies with the aspect-oriented programming language ObjectTeams/Java that investigate the re-usability of aspects in developing a security framework. ...

Clinicians report usability problems in modern health IT systems in part because the strictness of computerization eliminates the layer of informality which previously enabled them to get their jobs done. In this paper, we examine a solution by considering the strictly-enforced medical order as a security capability, and then using capability exchange to authorize frustrated end-users to re-int...

User interaction components of Augmented Reality (AR) systems have to be tested with users in order to find and fix usability problems as early as possible. In this paper we will report on a user-centered design approach for AR systems following the experience acquired during the design and evaluation of a software prototype for an AR-based educational platform. In this respect we will focus on...

The rapid growth of weblications—application-oriented software delivered as a service over the Web—has revealed a lack of effective guidelines for their design and implementation. Existing Web usability guidelines hinder weblication usability since they are primarily based on interactions within a browsing metaphor. Interface design guidelines for client applications, on the other hand, do not ...

Integrated IT-management has been a challenging research topic for several years now. However, integrated management of today’s large-scale, dynamic, and multiorganizational IT-systems is still in its infancy. To overcome the difficulties management solutions for such environments have either been re-done from scratch or simply ignored. It would be desirable to re-use well-established managemen...