Recommender Systems for Strategic Procurement in Value Networks

The implementation of recommender systems in electronic procurement processes for service packages, consisting of product- and service components requires a consideration of strategic, tactical and operational procurement as well as information and communication technologies in value networks. Increasingly, the design of recommender systems for procurement processes in value networks is of scientific interest. The combination of different procurement processes for products and services driven by recommender systems however, includes problems. This paper shows the need for a process-oriented approach in procurement at several abstraction levels. A model for the design of the electronic procurement process in value networks to serve the identification of complex service packages and suppliers with recommender systems is described. Different process characteristics are investigated for the applicability of recommender systems in e-procurement. As an artifact this approach adjust a proposal for the recommender system-based procurement process in value networks

PURCHASING PRODUCT-SERVICE BUNDLES IN VALUE NETWORKS - EXPLORING THE ROLE OF SCOR

The implementation of electronic procurement processes for product-service bundles, consisting of product- and service components requires a consideration of strategic, tactical and operational procurement and information and communication technologies in value networks. In the past, the scientific discussion oriented on traditional procurement processes for products and technology-solutions. Increasingly, the design of hybrid procurement processes in value networks is of scientific interest. The combination of different procurement processes for products and services, however, includes problems. This paper shows the need for a process-oriented approach in procurement at several abstraction levels. We describe a model for the design of the electronic procurement process in value networks to serve product-service bundles. Different process characteristics are investigated for the applicability of product-service bundles and SCOR. We adjust a proposal for the procurement process in value networks

Technische und organisatorische Potentiale eines E-Learning Wertschöpfungsnetzwerks in der Cloud

Online Lernen ist eine Komponente der Bildung im universitären Umfeld. In der letzten Dekade hat sich ein umfangreiches Angebot unterschiedlicher E-Learning Angebote und damit verbundene Technik etabliert. Neue technische Möglichkeiten sind ein wesentlicher Treiber für die weitere Entwicklung. Hochschulen und Unternehmen stehen vor ähnlichen Herausforderungen um auf neue Anforderungen flexibel zu reagieren. Der vorliegende Artikel zeigt, wie technisch durch das Konzept Cloud Computing eine effiziente Nutzung von Ressourcen und Nachhaltigkeitsforderungen für E-Learning erreicht werden können. Organisatorisch tragen Cloud Lösungen das Konzept eines Bildungsnetzwerks und können die Entstehung nachhaltiger Bildungsprodukte-as-a-Service befruchten

Ветро-дизельная система электроснабжения поселка

Работа направлена на решение проблемы электроснабжения отдаленных районов. Объектом исследования является гибридная ветро-дизельная система электроснабжения, находящаяся на юге Кемеровской области на высоте 1260 метров. В процессе исследования проводились анализ материалов в открытом доступе, запросы производителям, технико-экономическое сравнение. В результате исследования определен наиболее выгодный вариант. Область применения: энергодефицитные отдаленные районы, наиболее перспективные с точки зрения малой энергетики и обладающие потенциалом ВИЭ, в частности ветропотенциалом. Экономическая эффективность проекта заключается в снижении стоимости электроэнергии в шесть раз.Die Arbeit zielt auf die Losung der Energieversorgung von entlegenen Gebieten. Gegenstand der Studie ist ein Hybrid wind-Diesel-System der Elektrizitatsversorgung, das sich im Suden vom Gebiet Kemerowo auf einer Hohe von 1260 Meter. In der Studie wurden fur die Analyse von Materialien in der offentlichkeit, Anfragen von Herstellern, die technisch-wirtschaftlichen Vergleich. Die Studie ermittelt die Gunstigste Variante. Einsatzbereich: energiedefizite Randgebiete, die vielversprechendsten in Bezug auf niedrige Energie und mit dem Potential der erneuerbaren Energien, insbesondere Energiepotenzial. Die Wirtschaftseffektivitat des Projektes besteht in der Reduzierung der Kosten der Stromerzeugung in sechs mal

Multi‐Method Characterization of the High‐Entropy Spinel Oxide Mn0.2_{0.2}Co0.2_{0.2}Ni0.2_{0.2}Cu0.2_{0.2}Zn0.2_{0.2}Fe2_{2}O4_{4}: Entropy Evidence, Microstructure, and Magnetic Properties

The novel spinel Cu0.2Co0.2Mn0.2Ni0.2Zn0.2Fe2O4 comprising six transition metal cations was successfully prepared by a solution-combustion method followed by distinct thermal treatments. The entropic stabilization of this hexa-metallic material is demonstrated using in situ high temperature powder X-ray diffraction (PXRD) and directed removal of some of the constituting elements. Thorough evaluation of the PXRD data yields sizes of coherently scattering domains in the nanometre-range. Transmission electron microscopy based methods support this finding and indicate a homogeneous distribution of the elements in the samples. The combination of 57Fe Mössbauer spectroscopy with X-ray absorption near edge spectroscopy allowed determination of the cation occupancy on the tetrahedral and octahedral sites in the cubic spinel structure. Magnetic studies show long-range magnetic exchange interactions which are of ferri- or ferromagnetic nature with an exceptionally high saturation magnetization in the range of 92–108 emu g−1 at low temperature, but also an anomaly in the hysteresis of a sample calcined at 500 °C

Room-Temperature Solid-State Transformation of Na4 SnS4 ⋅ 14H2 O into Na4 Sn2 S6 ⋅ 5H2 O: An Unusual Epitaxial Reaction Including Bond Formation, Mass Transport, and Ionic Conductivity

A highly unusual solid-state epitaxy-induced phase transformation of Na4 SnS4  ⋅ 14H2 O (I) into Na4 Sn2 S6  ⋅ 5H2 O (II) occurs at room temperature. Ab initio molecular dynamics (AIMD) simulations indicate an internal acid-base reaction to form [SnS3 SH]3- which condensates to [Sn2 S6 ]4- . The reaction involves a complex sequence of O-H bond cleavage, S2- protonation, Sn-S bond formation and diffusion of various species while preserving the crystal morphology. In situ Raman and IR spectroscopy evidence the formation of [Sn2 S6 ]4- . DFT calculations allowed assignment of all bands appearing during the transformation. X-ray diffraction and in situ 1 H NMR demonstrate a transformation within several days and yield a reaction turnover of ≈0.38 %/h. AIMD and experimental ionic conductivity data closely follow a Vogel-Fulcher-Tammann type T dependence with D(Na)=6×10-14  m2  s-1 at T=300 K with values increasing by three orders of magnitude from -20 to +25 °C

Room‐Temperature Solid‐State Transformation of Na4_{4}SnS4_{4} ⋅ 14H2_{2}O into Na4_{4}Sn2_{2}S6_{6} ⋅ 5H2_{2}O: An Unusual Epitaxial Reaction Including Bond Formation, Mass Transport, and Ionic Conductivity

A highly unusual solid-state epitaxy-induced phase transformation of Na$_{4}$SnS$_{4}$ ⋅ 14H$_{2}$O (I) into Na$_{4}$Sn$_{2}$S$_{6}$ ⋅ 5H$_{2}$O (II) occurs at room temperature. Ab initio molecular dynamics (AIMD) simulations indicate an internal acid-base reaction to form [SnS$_{3}$SH]$^{3-}$ which condensates to [Sn$_{2}$S$_{6}$]$^{4–}$. The reaction involves a complex sequence of O−H bond cleavage, S$^{2–}$ protonation, Sn−S bond formation and diffusion of various species while preserving the crystal morphology. In situ Raman and IR spectroscopy evidence the formation of [Sn$_{2}$S$_{6}$]$^{4–}$. DFT calculations allowed assignment of all bands appearing during the transformation. X-ray diffraction and in situ $^{1}$H NMR demonstrate a transformation within several days and yield a reaction turnover of ≈0.38 %/h. AIMD and experimental ionic conductivity data closely follow a Vogel-Fulcher-Tammann type T dependence with D(Na)=6×10$^{-14}$ m$^{2}$ s$^{-1}$ at T=300 K with values increasing by three orders of magnitude from −20 to +25 °C

Social Networking Services: Eine empirische Exploration zu Profilmanagement, Kontaktmanagement und Nachrichtenaustausch

Social Networking Services (SNS) haben die zeit- und ortsunabhängige Konversation zwischen Teilnehmern nachhaltig verändert. Forschungsarbeiten die dienstbetreiberübergreifend die Nutzung von Profilmanagement, Kontaktmanagement und Nachrichtenaustausch im privaten und geschäftlichen Umfeld öffentlicher SNS untersuchen, sind kaum vertreten. In diesem Beitrag werden Ergebnisse einer empirischen Studie vorgestellt, in der die Themen in diesen Netzwerkausprägungen untersucht werden. Eine Befragung von 1003 Internetnutzern zeigt eine Affinität zum Nachrichtenaustausch im geschäftlichen Umfeld. Hinsichtlich der mobilen Nutzung dominiert E-Mail als Kommunikationsmittel. Trends für zukünftige SNS werden aufgezeigt

E-Procurement of Cloud-based Information Systems – a Product-Service System Approach

The way of providing information systems for companies changes dramatically. Topics like cloud computing serve as a promoter for the replacement of traditional monolithic business applications towards distributed and orchestrated application landscapes. This leads to new challenges in the development and provisioning of information systems. The question is now how to purchase appropriate application components, which may be integrated into an application landscape, rather than how to develop an information system from scratch. This leads to a shift in paying more attention to an appropriate procurement process of application components rather than to software development. This paper answers this issue by providing a sophisticated procurement process for cloud-based information systems by adapting a reference model for the procurement of product-service systems. Based on this procurement model, IT providers may provide solutions with higher complexity and better customer demand alignment to gain competitive advantage in a growing and dynamic market segment