High resolution digital 3D modelling of subsurface morphological structures of Koutouki Cave, Greece

Remote sensing techniques and laser scanning technology have given us the opportunity to study indoor environments, such as caves, with their complex and unique morphology. In the presented case study, we used a handheld laser scanner for acquiring points with projected coordinate information (X, Y, Z) covering the entire show cave of Koutouki; including its hidden passages and dark corners. The point cloud covers the floor, the walls, and the roof of the cave, as well as the stalactites, stalagmites and the connected columns that constitute the decoration of the cave. The absolute and exact placement of the point cloud within a geographic reference frame gives us the opportunity for three-dimensional measurements and detailed visualization of the subsurface structures. Using open - source software, we managed to make a quantification analysis of the terrain and generated morphological and geometric features of the speleothems. We identified 55 columns by using digital terrain analysis and processed them statistically in order to correlate them to the frame of the cave development. The parameters that derived are the contours, each column height, the speleothem geometry and volume, as well as the volume of the open space cavity. We argue that by the demonstrated methodology, it is possible to identify with high accuracy and detail: the geomorphological features of a cave, an estimate of the speleogenesis, and the ability to monitor the evolution of a karstic system.Key words: cave, laser scanner, 3D representation, speleothems, SLAM.  Visokoločljivostno digitalno 3D modeliranje podzemeljskih morfoloških struktur v jami Koutouki, Grčija Daljinsko zaznavne tehnologije in laserji nam omogočajo raziskovanje zaprtih prostorov, kot so jame z njihovo kompleksno in edinstveno morfologijo. Za pridobivanje različno dostopnih podatkov v turistični jami Koutouki smo v študiji uporabljali ročni laserski skener. Točkovni oblak pokriva tla, stene in strop jame ter stalaktite, stalagmite in stebre, ki prispevajo k okrasju jame. Natančna postavitev točkovnega oblaka v referenčnih geografskih okvirjih daje možnost tridimenzionalnih meritev in podrobne vizualizacije struktur v podzemlju. S podrobno analizo terena smo opredelili 55 stebrov in jih uvrstili v okvir razvoja jame. Pridobljeni so bili podatki o strukturiranosti, višini vsakega stebra, obliki in prostornini tamkajšnjih siginih tvorb ter prostornini prostega jamskega prostora. Z uporabljeno metodologijo je torej mogoče podrobno in z veliko natančnostjo opredeliti geomorfološke značilnosti jame, predvideti potek speleogeneze in spremljati razvoj kraškega sistema.Ključne besede: jama, laserski skener, 3D prikaz, sigine tvorbe, SLAM

Information Systems Skills Differences between High-Wage and Low-Wage Regions: Implications for Global Sourcing

Developing Information Systems (IS) skills for a company’s workforce has always been challenging, but global sourcing growth has caused the determination of needed IS skills to be more complex. The increased use of outsourcing to an IS service provider and from high-wage regions to low-wage regions has affected what IS skills are required globally and how to distribute the workforce to meet these needs. To understand what skills are needed in locations that seek and those that provide outsourcing, we surveyed IS service provider managers in global locations. Results from 126 reporting units provide empirical evidence that provider units in low-wage regions value technical skills more than those in high-wage regions. Despite the emphasis on commodity skills in low-wage areas, high- and low-wage providers value project management skills. Low-wage regions note global and virtual teamwork more than high-wage regions do. The mix of skills and the variation by region have implications for domestic and offshore sourcing. Service providers can vary their staffing models in global regions which has consequences for recruiting, corporate training, and curriculum

Web interfaces to enhance CAL materials: Case studies from law and statistics

One impact of the ‘information age’ is that a variety of new learning resources have become available to both students and tutors. Using these resources effectively and with a sound pedagogical basis presents a whole array of issues for teaching professionals. In this paper the authors describe the development and implementation of a Web interface to existing computer‐based learning materials in an attempt to enhance the student learning experience. Although the innovations occurred in two very different disciplines ‐statistics and law ‐ there are common lessons to be learned about the process of learning and the use of technology

Recursion Aware Modeling and Discovery For Hierarchical Software Event Log Analysis (Extended)

This extended paper presents 1) a novel hierarchy and recursion extension to the process tree model; and 2) the first, recursion aware process model discovery technique that leverages hierarchical information in event logs, typically available for software systems. This technique allows us to analyze the operational processes of software systems under real-life conditions at multiple levels of granularity. The work can be positioned in-between reverse engineering and process mining. An implementation of the proposed approach is available as a ProM plugin. Experimental results based on real-life (software) event logs demonstrate the feasibility and usefulness of the approach and show the huge potential to speed up discovery by exploiting the available hierarchy.Comment: Extended version (14 pages total) of the paper Recursion Aware Modeling and Discovery For Hierarchical Software Event Log Analysis. This Technical Report version includes the guarantee proofs for the proposed discovery algorithm

3D body scanning and healthcare applications

Developed largely for the clothing industry, 3D body-surface scanners are transforming our ability to accurately measure and visualize a person's body size, shape, and skin-surface area. Advancements in 3D whole-body scanning seem to offer even greater potential for healthcare applications

Investigating e-business practices in tourism :a comparative analysis of three countries

This study examined the behaviour of tourist companies in relation to the adoption of e-business technologies and applications. The study aimed to identify groups of companies with homogenous behaviour among three European countries (Greece, Portugal and Norway). Based on data from a European survey, the study employed two-step cluster analysis which revealed 14 clusters of common behaviour (five clusters in Greece, five in Portugal and four in Norway). These clusters were named as: Leaders’ ‘Technology Experts’, ‘Fast Adopters’ ‘Beginners’, ‘Late Adopters’. In Norway, the group ‘Late Adopters’ also included companies characterised as ‘Beginners’ in the other two countries. We suggest further investigation among European countries in order to reveal more groups of similar behaviour toward e-business adoption