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      • KCI우수등재
      • KCI등재

        A SECURITY ARCHITECTURE FOR THE INTERNET OF THINGS

        ( Reinhard Behrens ),( Ali Ahmed ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.12

        This paper demonstrates a case for an end-to-end pure Application Security Layer for reliable and confidential communications within an Internet of Things (IoT) constrained environment. To provide a secure key exchange and to setup a secure data connection, Transport Layer Security (TLS) is used, which provides native protection against replay attacks. TLS along with digital signature can be used to achieve non-repudiation within app-to-app communications. This paper studies the use of TLS over the JavaScript Object Notation (JSON) via a The Constrained Application Protocol (CoAP) RESTful service to verify the hypothesis that in this way one can provide end-to-end communication flexibility and potentially retain identity information for repudiation. As a proof of concept, a prototype has been developed to simulate an IoT software client with the capability of hosting a CoAP RESTful service. The prototype studies data requests via a network client establishing a TLS over JSON session using a hosted CoAP RESTful service. To prove reputability and integrity of TLS JSON messages, JSON messages was intercepted and verified against simulated MITM attacks. The experimental results confirm that TLS over JSON works as hypothesised.

      • SCIESCOPUS

        Fatigue of tubular steel lighting columns under wind load

        Peil, U.,Behrens, M. Techno-Press 2002 Wind and Structures, An International Journal (WAS Vol.5 No.5

        Lighting and traffic signal columns are mainly stressed by excitation due to natural, gusty wind. Such columns typically have a door opening about 60 cm above ground level for the connection of the buried cable with the column's electric system. When the columns around this notch are inadequately designed, vibrations due to gusty winds will produce considerable stress amplitudes in this area, which lead to fatigue cracks. To give a realistic basis for a reliable and economic design of lighting and traffic signal columns, a number of experimental and theoretical investigations have been made. The proposed design concept allows the life of such columns to be assessed with a satisfactory degree of accuracy.

      • KCI등재

        Effect of dietary supplementation with Spirulina on the expressions of AANAT, ADRB3, BTG2 and FASN genes in the subcutaneous adipose and Longissimus dorsi muscle tissues of purebred and crossbred Australian sheep

        ( Arash Kashani ),( Benjamin William Behrens Holman ),( Peter David Nichols ),( Aduli Enoch Othniel Malau Aduli ) 한국동물자원과학회(구 한국축산학회) 2015 한국축산학회지 Vol.57 No.8

        Background The demand for healthy, lean and consistent meat products containing low saturated fatty acid content and high quality polyunsaturated fatty acids (PUFA), especially long-chain (≥C20) omega-3 PUFA, has increased in recent times. Fat deposition is altered by both the genetic background and dietary supplements, and this study aimed to assess the effect of dietary Spirulina supplementation levels on the mRNA expression patterns of genes controlling lipid metabolism in the subcutaneous adipose tissue (SAT) and Longissimus dorsi (ld) muscle of Australian crossbred sheep. Methods Twenty-four weaned lambs belonging to four breeds under the same management conditions were maintained on ryegrass pasture and fed three levels of Spirulina supplement (control, low and high). In terms of nutrient composition, Spirulina is a nutrient-rich supplement that contains all essential amino acids, vitamins and minerals. It also is a rich source of carotenoids and fatty acids, especially gamma-linolenic acid (GLA) that infer health benefits. After slaughter, subcutaneous adipose tissue (SAT) and ld samples were subjected to mRNA extraction and reverse transcription using quantitative polymerase chain reaction (RT-qPCR) to assess the mRNA expression levels of the Aralkylamine N-acetyltransferase (AANAT), Adrenergic beta-3 receptor (ADRB3), B-cell translocation gene 2 (BTG2) and Fatty acid synthase (FASN) genes, which are associated with lipid metabolism. Results Both low and high Spirulina supplementation levels strongly up-regulated the transcription of all the selected genes in both SAT and ld tissues (mostly in the subcutaneous adipose), but sheep breed and sex did not influence the gene expression patterns in these tissues. Conclusions The evidence indicates that high Spirulina supplementation level resulted in a decrease in intramuscular fat content in Australian purebred and crossbred sheep due to the enhanced production of melatonin in sheep muscle tissues and strong up-regulation of mRNA expression of BTG2 in SAT which negatively affected fat deposition. In contrast, low Spirulina supplementation level strongly up-regulated the ADRB3 and FASN genes responsible for fat production. These findings are consistent with the observed phenotypic data suggesting that low Spirulina supplementation level can increase lamb production, with higher long-chain PUFA content.

      • KCI등재

        Segmenting Satellite Supporters Based on Their Value for Team Sport Organizations

        Sebastian Uhrich,Anton Behrens,Tae-Ahn Kang,Hirotaka Matsuoka,Kim Uhlendorf 글로벌지식마케팅경영학회 2023 Journal of Global Sport Management Vol.8 No.1

        An increasing number of team sport consumers around the globe follow foreign leagues, teams or athletes. These so-called satellite supporters may be loosely interested individuals or avid fans, they engage in diverse activities, and they have varying consump- tion behaviors. However, the extant research does not offer sys- tematic classifications of the different subgroups of satellite supporters, preventing team sport organizations from making effi- cient allocations of marketing resources in foreign markets. This research addresses this gap by providing a segmentation of satel- lite supporters that is based on the value that these supporters generate for team sport organizations. The segmentation consid- ers dimensions of value that are both financial (i.e. transactional value) and non-financial (i.e. influencer value and relationship value). Based on data from a large-scale survey (N 1⁄4 2,710) in four key international target markets (China, Japan, Germany, and the UK), a two-step cluster analysis identified three segments: High Value Satellite Fans, Mid Value Satellite Supporters, and Low Value Satellite Casuals. We discuss these segments as well as the managerial and theoretical implications of the study.

      • KCI등재

        Effect of dietary supplementation with Spirulina on the expressions of AANAT, ADRB3, BTG2 and FASN genes in the subcutaneous adipose and Longissimus dorsi muscle tissues of purebred and crossbred Australian sheep

        Arash Kashani,Benjamin William Behrens Holman,Peter David Nichols,Aduli Enoch Othniel Malau-Aduli 한국축산학회 2015 한국축산학회지 Vol.57 No.3

        Background: The demand for healthy, lean and consistent meat products containing low saturated fatty acidcontent and high quality polyunsaturated fatty acids (PUFA), especially long-chain (≥C20) omega-3 PUFA, hasincreased in recent times. Fat deposition is altered by both the genetic background and dietary supplements, andthis study aimed to assess the effect of dietary Spirulina supplementation levels on the mRNA expression patternsof genes controlling lipid metabolism in the subcutaneous adipose tissue (SAT) and Longissimus dorsi (ld) muscle ofAustralian crossbred sheep. Methods: Twenty-four weaned lambs belonging to four breeds under the same management conditions weremaintained on ryegrass pasture and fed three levels of Spirulina supplement (control, low and high). In terms ofnutrient composition, Spirulina is a nutrient-rich supplement that contains all essential amino acids, vitamins andminerals. It also is a rich source of carotenoids and fatty acids, especially gamma-linolenic acid (GLA) that inferhealth benefits. After slaughter, subcutaneous adipose tissue (SAT) and ld samples were subjected to mRNAextraction and reverse transcription using quantitative polymerase chain reaction (RT-qPCR) to assess the mRNAexpression levels of the Aralkylamine N-acetyltransferase (AANAT), Adrenergic beta-3 receptor (ADRB3), B-celltranslocation gene 2 (BTG2) and Fatty acid synthase (FASN) genes, which are associated with lipid metabolism. Results: Both low and high Spirulina supplementation levels strongly up-regulated the transcription of all theselected genes in both SAT and ld tissues (mostly in the subcutaneous adipose), but sheep breed and sex did notinfluence the gene expression patterns in these tissues. Conclusions: The evidence indicates that high Spirulina supplementation level resulted in a decrease inintramuscular fat content in Australian purebred and crossbred sheep due to the enhanced production ofmelatonin in sheep muscle tissues and strong up-regulation of mRNA expression of BTG2 in SAT which negativelyaffected fat deposition. In contrast, low Spirulina supplementation level strongly up-regulated the ADRB3 and FASNgenes responsible for fat production. These findings are consistent with the observed phenotypic data suggestingthat low Spirulina supplementation level can increase lamb production, with higher long-chain PUFA content.

      • CUSTOMER VALUE PERCEPTION:CROSS-NATIONAL PREFERENCES FOR ORGANIC FOOD

        Barbara Seegebarth,Klaus-Peter Wiedmann,Stefan Behrens,Christiane Klarmann,Lisa Luebbehusen Scribner 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.7

        During the last decades more and more consumers worldwide, started integrating environmental considerations into daily purchases what leads the so-called ‘green consumer’ to ask for healthier, safer, and better quality food. Nonetheless, a deeper understanding of value dimensions consumers across nations perceive in the context of organic food products is still required to develop successful management strategies which might transfer positive consumer perceptions to satisfaction and resulting buying behavior. Against this backdrop, the present study focuses on a) the antecedents leading to the consumption of organic food products and b) the identification of differences regarding the relative importance of the value-based drivers across US and German consumers

      • SCIEKCI등재

        Development of a Concept to Optimize the Energy Efficiency in Forging Process Chains

        Denkena, Berend,Park, Hong-Seok,Behrens, Bernd-Arno,Henjes, Jan,Bertys, Sebastian,Dahal, Prakash,Luken, Ingo,Klassen, Andreas Korean Society for Precision Engineering 2013 International Journal of Precision Engineering and Vol.14 No.7

        In the industrial production, approaches for the optimization of process chains mainly focus on criteria like quality, costs and time. Normally the energy consumption of process chains is not considered, although the variation of process parameters is an important possibility to reduce the consumption significantly. Besides that, the investigated processes are often optimized locally without considering the interaction between the different process elements of the whole process chain. Based on this background the developed concept realizes the optimization of the energy consumption of a forging process chain by adaptation of its energetic relevant parameters. Therefore, the concept defines at first variation intervals for the energetic most significant parameters of a forging process chain. After that, the resulting technical/technological modifications are evaluated energetically. To enable a holistic optimization of the process chain, the approach includes the use of a simulation model. The application of the concept has been approved with a simulation model of a 4-cylinder-crankshaft process chain. With the parameter variations 'reduction of the forging temperature', 'reduction of the raw part volume' and 'reduction of the forging time' three possibilities to reduce the energy consumption were identified successfully.

      • KCI등재

        Performance Characterization of Thin-Film-Silicon Based Solar Modules under Clouded and Clear Sky Conditions in Comparison to Crystalline Silicon Modules

        J. A. Weicht,R. Rasch,G. Behrens,F. U. Hamelmann 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.4

        For a precise prediction of the energy yield of amorphous (a-Si) and amorphous-microcrystalline tandem (a-Si/μc-Si) thinfilm-silicon photovoltaic (PV) modules it is important to knowtheir performance ratio under different light conditions. Theefficiency of solar modules is an important value for themonitoring and planning of PV-systems. The efficiency of a-Si solar modules shows no significant changes in theperformance ratio at clouded or clear sky conditions. Theefficiency of crystalline silicon-based (c-Si) and a-Si/μc-Sisolar modules shows a lower efficiency for fully cloudedconditions without direct irradiation compared to conditionswith direct irradiation (clear sky).

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