TY - JOUR A1 - Weber, Tim A. A1 - Dendorfer, Sebastian A1 - Bulstra, Sjoerd K. A1 - Grifka, Joachim A1 - Verkerke, Gijsbertus Jacob A1 - Renkawitz, Tobias T1 - Gait six month and one-year after computer assisted Femur First THR vs. conventional THR. Results of a patient- and observer- blinded randomized controlled trial JF - Gait & Posture N2 - A prospective randomized controlled trial is presented that is used to compare gait performance between the computer assisted Femur First (CAS FF) operation method and conventional THR (CON). 60 patients underwent a 3D gait analysis of the lower extremity at pre-operative, 6 months post-operative and twelve months post-operative. Detailed verification experiments were facilitated to ensure the quality of data as well as to avoid over-interpreting of the data. The results confirm a similar data-quality as reported in the literature. Walking speed, range of motion and symmetry thereof improved over the follow-up period, without significant differences between the groups. While all parameters do significantly increase over the follow-up period for both groups, there were no significant differences between them at any given time-point. Patients undergoing CAS FF showed a trend to improved hip flexion angle indicating a possible long-term benefit. KW - Biomechanics KW - Combined anteversion KW - Computer-assisted surgery KW - Femur first KW - Gait analysis Y1 - 2016 U6 - https://doi.org/10.1016/j.gaitpost.2016.06.035 VL - vol. 49 SP - 418 EP - 425 ER - TY - CHAP A1 - Herrmann, Frank T1 - Scheduling in case of a Partially Automated Production T2 - Proceedings of the International Annual Conference of the German Operations Research Society 2016 (OR 2016), Hamburg, 30.8. - 4.9.2016 N2 - In recent years, a considerable amount of interest has arisen for scheduling problems with technological restrictions. For example, no-buffer flow-shop scheduling problem are well investigated. Here a real world flow shop with a transportation restriction is regarded. It has to produce small batches, very often with a lot size of one, with short response times. Thus, scheduling algorithms are needed to ensure that under the constraint of a high average load of the flow shop, the duedates of the production orders are met. This transportation restriction reduces the set of feasible schedules even more than the nobuffer restrictions discussed in the literature in the case of limited storage. Still this problem is NP-hard. Due to the transportation restriction, the duration of a job A on the flow-shop depends on the other jobs processedon the flow-shop in the same time frame which is called a cycle. Realistic processing times are achieved by a simulation of the scheduling of A which includes the next jobs until A has left the flow-shop. The usage of such realistic processing times instead of net processing times improves the priority rules by around 16%. There are pools of jobs where a large variance of the cycle times is beneficial and pools of jobs where a small variance is better. This is partially detected by agenetic algorithm. This improves the performance by another 34%. KW - Produktionsplanung KW - Ablaufplanung Y1 - 2016 ER - TY - CHAP A1 - Trost, Marco A1 - Claus, Thorsten A1 - Teich, Enrico A1 - Selmair, Maximilian A1 - Herrmann, Frank T1 - Social and Ecological Capabilities for a sustainable Hierarchical Production Planning T2 - Proceedings of the 30th EUROPEAN Conference on Modeling and Simulation (ECMS 2016), May 31st - June 3rd, 2016, Regensburg, Germany N2 - Production planning and production control mainly focus on optimising the entire production system of a company. On the basis of hierarchical planning as a suitable method for solving this task, this paper shows - besides the economic dimension taken into account so far - that there are also social and ecological effects which will have to be considered in the process of planning. For this purpose, we would like to indicate here which social and ecological parameters can be or have already been taken into account for master production scheduling, for lot sizing and resource scheduling. As a result, an overview has been created which presents the existing concepts of sustainable production planning and production control as well as the existing deficits regarding the sustainability perspective. KW - Hierarchische Produktionsplanung KW - Soziale Verantwortung KW - Ökologie KW - production planning KW - hierarchical planning KW - social variables KW - ecological variables KW - sustainable hierarchical production planning Y1 - 2016 U6 - https://doi.org/10.7148/2016-0432 ER - TY - CHAP A1 - Herrmann, Frank T1 - Schrittweise Verbesserung des Realbetriebs einer Produktionslinie mit simultanem Produktionsfortschritt T2 - Tagungsband zu "Wissenstransfer in der Wirtschaftsinformatik" im Rahmen der MKWI 2016; vom 09. bis 11. März 2016 an der Technischen Universität Ilmenau in Thüringen KW - Produktionslinie KW - Produktionsfortschritt Y1 - 2016 SP - 19 EP - 26 ER - TY - CHAP A1 - Trost, Marco A1 - Claus, Thorsten A1 - Teich, Enrico A1 - Herrmann, Frank T1 - Die soziale Dimension in der nachhaltigen hierarchischen Produktionsplanung – Stand der Forschung und Ansätze zur Weiterentwicklung bestehender Planungsmodelle T2 - Proceedings zur NAMA 2016 (NAMA 2016), October 5th - 7th, 2016, Dresden, Germany N2 - Bei der Produktionsplanung steht die Optimierung des Produktionssystems eines Unternehmens im Vordergrund. In diesem Beitrag wird auf Basis der hierarchischen Produktionsplanung aufgezeigt, dass neben ökonomischen und ökologischen Aspekten insbesondere auch soziale Effekte bei der Entscheidungsfindung zu berücksichtigen sind. Dazu werden für die Hauptproduktionsprogrammplanung, die Losgrößenplanung und die Ressourcenbelegungsplanung dargelegt, welche sozialen Größen berücksichtigt werden können beziehungsweise bereits berücksichtigt sind. Überdies wird ein Modellansatz zur Hauptproduktionsprogrammplanung vorgestellt, der auf die Beseitigung identifizierter Forschungslücken abzielt. KW - Hierarchische Produktionsplanung KW - Nachhaltigkeit KW - Soziale Verantwortung Y1 - 2016 ER - TY - CHAP A1 - Selmair, Maximilian A1 - Claus, Thorsten A1 - Trost, Marco A1 - Bley, Andreas A1 - Herrmann, Frank T1 - Job Shop Scheduling with Flexible Energy Prices T2 - Proceedings of the 30th EUROPEAN Conference on Modeling and Simulation, May 31st - June 3rd, 2016, Regensburg, Germany N2 - The rising energy prices – particularly over the last decade – pose a new challenge for the manufacturing industry. Reactions to climate change, such as the advancement of renewable energies, raise the expectation of further price increases and variations. Regarding the manufacturing industry, production planning and controlling can have a significant influence on the in-plant energy consumption. In this paper, we develop a scheduling method as a linear optimization model with the objective to minimize energy costs in a job shop production system. KW - Job Shop Scheduling KW - Flexible Energy Prices KW - Energy Efficient Production Planning KW - Energy Consumption KW - Standby Y1 - 2016 U6 - https://doi.org/10.7148/2016-0488 ER - TY - GEN ED - Barton, Thomas ED - Herrmann, Frank ED - Meister, Vera G. ED - Müller, Christian ED - Seel, Christian T1 - Angewandte Forschung in der Wirtschaftsinformatik: Prozesse, Technologien, Anwendungen, Systeme und Management BT - Tagungsband zur 29. AKWI-Fachtagung am 12.09.2016 an der Technische Hochschule Brandenburg, 2016, Germany KW - Wirtschaftsinformatik Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-2767 PB - mana-Buch CY - Heide ER - TY - JOUR A1 - Hauser, Christian A1 - Herrmann, Frank T1 - Optimierung der Materialbereitstellung in der Fertigung nach Lean-Methoden in Anlehnung an das Kanban-Prinzip JF - Anwendungen und Konzepte der Wirtschaftsinformatik (AKWI) N2 - Lean Management wurde in den letzten Jahren in den deutschen Produktionsbetrieben immer populärer. Die daraus resultierende Umstrukturierung bringt meist eine höhere Wirtschaftlichkeit, Produktivität und große Einsparpotenziale mit sich. Im Zuge dessen sollen bei der Produktion der Kühlbehälter (IsoTec) der Gebhardt Logistic Solutions GmbH in Cham Potenziale und Maßnahmen aufgedeckt werden, um die Prozesse zu verbessern. Großes Augenmerk liegt dabei, in der Anwendung eines der bekanntesten Methode des Lean Managements, dem Kanban-Prinzip, zur Optimierung der Materialbereitstellung, den Lagerbeständen und den Durchlaufzeiten. Damit verbunden ist die Verkürzung der Lieferzeiten gegenüber dem Kunden. Durch die Nutzung der eigenen Kompetenzen rund um die Transportbehälterfertigung wird die Bereitstellung und der Transport der benötigten Materialien für die Montage neu geplant und umgesetzt. KW - Lean Management KW - Kanban-System KW - Kanban KW - Lean Management KW - Optimierung KW - Wertstrom Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-2049 UR - https://ojs-hslu.ch/ojs302/index.php/AKWI/article/view/44 VL - 4 SP - 50 EP - 54 ER - TY - JOUR A1 - Herrmann, Frank T1 - Using Optimization Models for Scheduling in Enterprise Resource Planning Systems JF - Systems N2 - Companies often use specially-designed production systems and change them from time to time. They produce small batches in order to satisfy specific demands with the least tardiness. This imposes high demands on high-performance scheduling algorithms which can be rapidly adapted to changes in the production system. As a solution, this paper proposes a generic approach: solutions were obtained using a widely-used commercially-available tool for solving linear optimization models, which is available in an Enterprise Resource Planning System (in the SAP system for example) or can be connected to it. In a real-world application of a flow shop with special restrictions this approach is successfully used on a standard personal computer. Thus, the main implication is that optimal scheduling with a commercially-available tool, incorporated in an Enterprise Resource Planning System, may be the best approach. KW - Enterprise-Resource-Planning KW - Produktionsplanung KW - Lineare Optimierung KW - Scheduling KW - Optimization model KW - Real world application KW - Enterprise resource planning system KW - Material requirements planning II KW - Priority rules Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-2036 VL - 4 IS - 1 ER - TY - JOUR A1 - Englberger, Julian A1 - Herrmann, Frank A1 - Manitz, Michael T1 - Two-stage stochastic master production scheduling under demand uncertainty in a rolling planning environment JF - International Journal of Production Research N2 - This paper proposes a scenario-based two-stage stochastic programming model with recourse for master production scheduling under demand uncertainty. We integrate the model into a hierarchical production planning and control system that is common in industrial practice. To reduce the problem of the disaggregation of the master production schedule, we use a relatively low aggregation level (compared to other work on stochastic programming for production planning). Consequently, we must consider many more scenarios to model demand uncertainty. Additionally, we modify standard modelling approaches for stochastic programming because they lead to the occurrence of many infeasible problems due to rolling planning horizons and interdependencies between master production scheduling and successive planning levels. To evaluate the performance of the proposed models, we generate a customer order arrival process, execute production planning in a rolling horizon environment and simulate the realisation of the planning results. In our experiments, the tardiness of customer orders can be nearly eliminated by the use of the proposed stochastic programming model at the cost of increasing inventory levels and using additional capacity. KW - Hierarchische Produktionsplanung KW - Fertigungsprogrammplanung KW - Nachfrageverhalten KW - Stochastische Optimierung KW - Master production scheduling KW - Demand uncertainty KW - Two-stage stochastic programming KW - Scenario-based stochastic programming with recourse KW - Hierarchical production planning Y1 - 2016 U6 - https://doi.org/10.1080/00207543.2016.1162917 VL - 54 IS - 20 SP - 6192 EP - 6215 PB - Taylor & Francis ER - TY - CHAP A1 - Franz, Daniela A1 - Katzky, Uwe A1 - Neumann, Sabine A1 - Perret, Jerome A1 - Hofer, Mathias A1 - Huber, Michaela A1 - Schmitt-Rüth, Stephanie A1 - Haug, Sonja A1 - Weber, Karsten A1 - Prinzen, Martin A1 - Palm, Christoph A1 - Wittenberg, Thomas T1 - Haptisches Lernen für Cochlea Implantationen BT - Konzept - HaptiVisT Projekt T2 - 15. Jahrestagung der Deutschen Gesellschaft für Computer- und Roboterassistierte Chirurgie (CURAC2016), Tagungsband, 2016, Bern, 29.09. - 01.10. N2 - Die Implantation eines Cochlea Implantates benötigt einen chirurgischen Zugang im Felsenbein und durch die Paukenhöhle des Patienten. Der Chirurg hat eine eingeschränkte Sicht im Operationsgebiet, die weiterhin viele Risikostrukturen enthält. Um eine Cochlea Implantation sicher und fehlerfrei durchzuführen, ist eine umfangreiche theoretische und praktische (teilweise berufsbegleitende) Fortbildung sowie langjährige Erfahrung notwendig. Unter Nutzung von realen klinischen CT/MRT Daten von Innen- und Mittelohr und der interaktiven Segmentierung der darin abgebildeten Strukturen (Nerven, Cochlea, Gehörknöchelchen,...) wird im HaptiVisT Projekt ein haptisch-visuelles Trainingssystem für die Implantation von Innen- und Mittelohr-Implantaten realisiert, das als sog. „Serious Game“ mit immersiver Didaktik gestaltet wird. Die Evaluierung des Demonstrators hinsichtlich Zweckmäßigkeit erfolgt prozessbegleitend und ergebnisorientiert, um mögliche technische oder didaktische Fehler vor Fertigstellung des Systems aufzudecken. Drei zeitlich versetzte Evaluationen fokussieren dabei chirurgisch-fachliche, didaktische sowie haptisch-ergonomische Akzeptanzkriterien. KW - Virtuelles Training KW - Haptisches Feedback KW - Gamification in der Medizin KW - Cochlea-Implantat KW - Operationstechnik KW - Simulation KW - Haptische Feedback-Technologie KW - Lernprogramm Y1 - 2016 UR - https://curac.org/images/advportfoliopro/images/CURAC2016/CURAC%202016%20Tagungsband.pdf SP - 21 EP - 26 ER - TY - CHAP A1 - Palm, Christoph A1 - Siegmund, Heiko A1 - Semmelmann, Matthias A1 - Grafe, Claudia A1 - Evert, Matthias A1 - Schroeder, Josef A. T1 - Interactive Computer-assisted Approach for Evaluation of Ultrastructural Cilia Abnormalities T2 - Medical Imaging 2016: Computer-Aided Diagnosis, San Diego, California, United States, 27 February - 3 March, SPIE Proceedings 97853N, 2016, ISBN 9781510600201 N2 - Introduction – Diagnosis of abnormal cilia function is based on ultrastructural analysis of axoneme defects, especialy the features of inner and outer dynein arms which are the motors of ciliar motility. Sub-optimal biopsy material, methodical, and intrinsic electron microscopy factors pose difficulty in ciliary defects evaluation. We present a computer-assisted approach based on state-of-the-art image analysis and object recognition methods yielding a time-saving and efficient diagnosis of cilia dysfunction. Method – The presented approach is based on a pipeline of basal image processing methods like smoothing, thresholding and ellipse fitting. However, integration of application specific knowledge results in robust segmentations even in cases of image artifacts. The method is build hierarchically starting with the detection of cilia within the image, followed by the detection of nine doublets within each analyzable cilium, and ending with the detection of dynein arms of each doublet. The process is concluded by a rough classification of the dynein arms as basis for a computer-assisted diagnosis. Additionally, the interaction possibilities are designed in a way, that the results are still reproducible given the completion report. Results – A qualitative evaluation showed reasonable detection results for cilia, doublets and dynein arms. However, since a ground truth is missing, the variation of the computer-assisted diagnosis should be within the subjective bias of human diagnosticians. The results of a first quantitative evaluation with five human experts and six images with 12 analyzable cilia showed, that with default parameterization 91.6% of the cilia and 98% of the doublets were found. The computer-assisted approach rated 66% of those inner and outer dynein arms correct, where all human experts agree. However, especially the quality of the dynein arm classification may be improved in future work. KW - Image analysis KW - Image processing KW - Computer aided diagnosis and therapy KW - Image classification KW - Image segmentation KW - Biopsy KW - Electron microscopy KW - Zilie KW - Ultrastruktur KW - Anomalie KW - Bildverarbeitung KW - Objekterkennung KW - Computerunterstütztes Verfahren Y1 - 2016 U6 - https://doi.org/10.1117/12.2214976 ER - TY - CHAP A1 - Kopper, Andreas A1 - Westner, Markus T1 - Deriving a Framework for Causes, Consequences, and Governance of Shadow IT from Literature T2 - Proceedings zur Multikonferenz Wirtschaftsinformatik 2016 (MKWI 2016), Technische Universität Ilmenau, Thüringen, 09.-11. März 2016 N2 - Shadow IT is a widespread phenomenon which includes systems, services, and processes that are not part of the "official" corporate IT. The topic is still an emerging research area and slowly gaining traction in recent years but a state of the art analysis is missing to date. We therefore conduct a structured literature review to derive a framework for causes, consequences, and governance of Shadow IT. We identify motivators, enablers, and missing barriers as causes for Shadow IT, both positive and negative consequences on an organizational and a technical level and governance approaches which focus on clearance of existing or prevention of future Shadow IT. Our review reveals that constructivist, qualitative design using a case study approach dominates existing research. There are no dominant theories yet to explain Shadow IT. We also highlight possibilities for future research to focus on the less explored governance aspect. KW - Schatten-IT KW - IT-Governance KW - Informationsmanagement KW - Corporate Governance KW - Literaturbericht Y1 - 2016 SP - 1687 EP - 1698 ER - TY - CHAP A1 - Kobus, Jörn A1 - Westner, Markus T1 - Ranking-type delphi studies in IS research BT - step-by-step guide and analytical extension T2 - Proceedings of the 9th IADIS International Conference Information Systems, Vilamoura, Portugal, 9-11 April N2 - Ranking-type Delphi is a frequently used method in IS research. However, besides several studies investigating a rigorous application of ranking-type Delphi as a research method, a comprehensive and precise step-by-step guide on how to conduct a rigorous ranking-type Delphi study in IS research is currently missing. In addition, a common critic of Delphi studies in general is that it is unclear if there is indeed authentic consensus of the panelists, or if panelists only agree because of other reasons (e.g. acquiescence bias or tiredness to disagreement after several rounds). This also applies to ranking-type Delphi studies. Therefore, this study aims to (1) Provide a rigorous step-by-step guide to conduct ranking-type Delphi studies through synthesizing results of existing research and (2) Offer an analytical extension to the ranking-type Delphi method by introducing Best/Worst Scaling, which originated in Marketing and Consumer Behavior research. A guiding example is introduced to increase comprehensibility of the proposals. Future research needs to validate the step-by-step guide in an empirical setting as well as test the suitability of Best/Worst Scaling within described research contexts. KW - Delphi KW - Best/Worst Scaling KW - Maximum-Difference-Scaling KW - MaxDiff KW - Delphi-Technik Y1 - 2016 UR - http://www.iadisportal.org/digital-library/ranking-type-delphi-studies-in-is-research-step-by-step-guide-and-analytical-extension SP - 28 EP - 38 ER - TY - CHAP A1 - Kopper, Andreas A1 - Westner, Markus T1 - Towards a Taxonomy for Shadow IT T2 - Proceedings of the 22nd Americas Conference on Information Systems (AMCIS 2016), San Diego, August 11-14 N2 - In a comprehensive literature review, we identified 21 different terms used for Shadow IT related concepts. This variety makes it difficult to identify related research and build upon it. To address this ambiguity, we reduce the different terms to six distinct concepts by developing a taxonomy and examining their relation¬ships. We do so by using a rigorous iterative methodology to identify common characteristics and to classify terms along them. By clustering the results, we derive and visualize the taxonomy. The identified concepts are Feral Practices, Workarounds, Shadow IT, Shadow Systems, Un-enacted Projects, and Shadow Sourcing. We elaborate on the concepts along their characteristics and clearly define and delimit them. As a result, we create a guide for their usage, increase search- and comparability, and unify existing knowledge. KW - Shadow IT KW - Shadow systems KW - Shadow sourcing KW - Feral practices KW - Workarounds KW - Taxonomy KW - Terminology KW - Informationstechnik KW - Datensicherung KW - Taxonomie KW - Literaturbericht Y1 - 2016 UR - https://aisel.aisnet.org/amcis2016/EndUser/Presentations/3/ SP - 1 EP - 10 ER - TY - CHAP A1 - Westner, Markus A1 - Skelton, David A1 - Tinat, Johannes T1 - Enhancing students’ IS offshoring capabilities BT - an international blended teaching concept T2 - Proceedings of the 7th Annual Conference of Computing and Information Technology Research and Education New Zealand (CITRENZ 2016), Wellington, New Zealand, July 11-13 N2 - An appreciation of globalisation issues by information systems (IS) graduates is a growing requirement of organisations with global reach. This paper discusses the planning of a joint course to be delivered online and face to face by two lecturers representing two tertiary institutes in Germany and New Zealand respectively. The IS offshoring content of the course is relatively unique and aspects of globalisation will be demonstrated through the dual country delivery of the course. The two lecturers involved have spent time lecturing and studying in their global partner’s country and tertiary institutes and so this joint delivery method is likely to also strengthen cultural ties between the two participating institutions including the students involved. Further research goals and issues are discussed for post-delivery of this dual country blended course. This paper provides a basis for this concept to be evaluated in further research. KW - Globalisation KW - Offshoring KW - Joint delivery KW - Blended global courses KW - International student KW - Informatikstudium KW - Integriertes Lernen KW - Internationale Kooperation KW - Deutschland KW - Neuseeland Y1 - 2016 UR - https://www.citrenz.ac.nz/conferences/2016/pdf/2016CITRENZ_1_Westner_IntBlended_15-2.pdf ER - TY - CHAP A1 - Kobus, Jörn A1 - Westner, Markus A1 - Strahringer, Susanne T1 - Lean Management of IT Organizations BT - a Perspective of IT Slack Theory T2 - Proceedings of the 37th International Conference on Information Systems (ICIS 2016), Dublin, N2 - Lean Management has been successfully implemented in production organizations since several decades. The study at hand investigates the implementation of Lean Management to IT organizations (Lean IT). The study offers three contributions: First, it explains on a conceptual level how Lean Management can be transferred from production to IT organizations (philosophy, principles, tools). Second, it provides a theoretical perspective on why Lean IT can be beneficial for IT organizations (IT Slack theory). Third, it provides insights to the stated research questions (three benefits and three propositions) from an initial case study of an internal IT service provider for a large international insurance company (> US$25 Billion revenue; >20,000 employees; active in >120 countries) and lays out the research methodology and potential focus areas for further studies. KW - Lean Management KW - Lean IT KW - IT Slack theory KW - Implementation KW - Application development and maintenance KW - Lean Management KW - Informationstechnik Y1 - 2016 UR - https://aisel.aisnet.org/icis2016/ManagingIS/Presentations/1/ SP - 1 EP - 12 ER - TY - JOUR A1 - Kobus, Jörn A1 - Westner, Markus A1 - Strahringer, Susanne T1 - Einführung von Lean Management in IT-Organisationen JF - HMD Praxis der Wirtschaftsinformatik N2 - In der Produktion gilt „Lean Management“ als einer der de-facto Standardmanagementansätze. Lean Management in IT-Organisationen (Lean IT) ist dahingegen in der Praxis weniger verbreitet und in der Wissenschaft kaum erforscht. Dieser Beitrag aggregiert und erweitert die Ergebnisse mehrerer Forschungsarbeiten. Dabei werden vorrangig zwei Aspekte diskutiert: (1) Ein mögliches Einführungsmodell für Lean IT. Dieses verknüpft fünf Rollen (Sponsor, Programmleiter, Navigator, Linienführungskraft und Linienexperte) mit vier Phasen (Vorbereitung, Analyse, Gestaltung und Implementierung). (2) Besondere Herausforderungen für Linienführungskräfte, die aufgrund der „bottom up“-Ausrichtung bei Lean-IT-Einführungen stark gefordert werden. Neben einer klaren Vision für die Organisationseinheit und dem Verständnis, an welcher Stelle Lean IT die Organisationseinheit konkret unterstützen kann, benötigen sie Offenheit, Veränderungswillen und die Bereitschaft Verantwortung an Mitarbeiter zu delegieren. Außerdem sollten sie über ein ausreichendes Zeitbudget für die Einführung verfügen, um ihrer gestaltenden und qualitätssichernden Funktion nachkommen zu können. KW - Betriebliches Informationssystem KW - Lean Management KW - Lean IT KW - IT-Industrialisierung KW - Lean Management KW - IT-Effizienzprogramme KW - Einführungsmodell Y1 - 2016 UR - https://link.springer.com/article/10.1365/s40702-016-0266-1 VL - 53 IS - 6 SP - 879 EP - 893 ER -