A service-oriented context-awareness reasoning framework and its implementation

2018 ◽  
Vol 36 (6) ◽  
pp. 1114-1134 ◽  
Author(s):  
Xiufeng Cheng ◽  
Jinqing Yang ◽  
Lixin Xia
Keyword(s):  
Context Awareness ◽  
Service Providers ◽  
User Behavior ◽  
Contextual Information ◽  
Sensor Data ◽  
Context Information ◽  
Content Type ◽  
Low Level ◽  
Service Oriented ◽  
High Level

PurposeThis paper aims to propose an extensible, service-oriented framework for context-aware data acquisition, description, interpretation and reasoning, which facilitates the development of mobile applications that provide a context-awareness service.Design/methodology/approachFirst, the authors propose the context data reasoning framework (CDRFM) for generating service-oriented contextual information. Then they used this framework to composite mobile sensor data into low-level contextual information. Finally, the authors exploited some high-level contextual information that can be inferred from the formatted low-level contextual information using particular inference rules.FindingsThe authors take “user behavior patterns” as an exemplary context information generation schema in their experimental study. The results reveal that the optimization of service can be guided by the implicit, high-level context information inside user behavior logs. They also prove the validity of the authors’ framework.Research limitations/implicationsFurther research will add more variety of sensor data. Furthermore, to validate the effectiveness of our framework, more reasoning rules need to be performed. Therefore, the authors may implement more algorithms in the framework to acquire more comprehensive context information.Practical implicationsCDRFM expands the context-awareness framework of previous research and unifies the procedures of acquiring, describing, modeling, reasoning and discovering implicit context information for mobile service providers.Social implicationsSupport the service-oriented context-awareness function in application design and related development in commercial mobile software industry.Originality/valueExtant researches on context awareness rarely considered the generation contextual information for service providers. The CDRFM can be used to generate valuable contextual information by implementing more reasoning rules.

Characterizing Smartphone Usage

2013 ◽  
Vol 4 (1) ◽  
pp. 15-36 ◽  
Author(s):  
Tapio Soikkeli ◽  
Juuso Karikoski ◽  
Heikki Hämmäinen
Keyword(s):  
Context Awareness ◽  
User Behavior ◽  
Mobile Services ◽  
End User ◽  
Unit Of Analysis ◽  
Context Sensitive ◽  
User Context ◽  
Services Industry ◽  
High Level

Mobile end user context has gained increasing attention in the mobile services industry. This article utilizes handset-based data, collected from 140 users, to examine smartphone usage in different place-related end user contexts. Smartphone usage is examined first on a high level by using smartphone usage session as a unit of analysis. Then the usage sessions are dismantled into application sessions for deeper analysis and application level study. According to the authors’ analysis, smartphone usage is highly diversified across users. For example, the daily smartphone usage time differs by orders of magnitude between users. They observed also that smartphones are used differently in different end user contexts. For example, some applications are clearly more context sensitive than others. The results imply that mobile services and applications need to adapt to user behavior in order to be personalized enough, and that context awareness can indeed be a worthwhile step towards this.

Reliability assessment on automobile suspension system using wavelet analysis

2019 ◽  
Vol 10 (5) ◽  
pp. 602-611
Author(s):  
Airee Afiq Abd Rahim ◽  
Shahrum Abdullah ◽  
Salvinder Singh Karam Singh ◽  
Mohd. Zaki Nuawi
Keyword(s):  
Fatigue Life ◽  
Wavelet Decomposition ◽  
Reliability Assessment ◽  
Content Type ◽  
Low Level ◽  
Rural Road ◽  
Automobile Suspension ◽  
Life Analysis ◽  
Fatigue Life Analysis ◽  
High Level

Purpose The purpose of this paper is to focus on the reliability assessment on the basis of automobile suspension fatigue life using wavelet decomposition method. Design/methodology/approach The discrete wavelet transform (DWT) of automobile coil spring signal is implemented as a response to different road surfaces. A reliability analysis is applied to determine the potential of the wavelet implementation in fatigue life analysis. The signals used in this study are highway and rural road. Findings On the basis of the implementation of wavelet decomposition method, low-level decomposition replicates the original signals in comparison with high-level decomposition. The fatigue life of low-level decomposition lies in the 2:1 and 1:2 correlation graph. The percentage difference for mean cycle to failure presents low values for low-level decomposition, with 44.31 per cent for highway and 44.20 per cent for rural road. The percentage of difference for high-level decomposition is high. Originality/value The determination of fatigue life analysis by using the DWT method is suitable for low-level decomposition. High-level decomposition is considered noise that cannot be eliminated and does not contribute to the failure of the structure.

Context-Awareness in Mobile Commerce

2009 ◽  
pp. 56-64
Author(s):  
Jun Sun ◽  
Marshall Scott Poole
Keyword(s):  
Context Awareness ◽  
Classification Scheme ◽  
Service Providers ◽  
Cell Phones ◽  
Contextual Information ◽  
Information Service ◽  
Mobile Commerce ◽  
Context Aware ◽  
Interactive Mode ◽  
Multimedia Technologies

Advances in wireless network and multimedia technologies enable mobile commerce (m-commerce) information service providers to know the location and surroundings of mobile consumers through GPS-enabled and camera-embedded cell phones. Context awareness has great potential for creating new service modes and improving service quality in m-commerce. To develop and implement successful context-aware applications in m-commerce, it is critical to understand the concept of the “context” of mobile consumers and how to access and utilize contextual information in an appropriate way. This article dissects the context construct along both the behavioral and physical dimensions from the perspective of mobile consumers, developing a classification scheme for various types of consumer contexts. Based on this classification scheme, it discusses three types of context-aware applications—noninteractive mode, interactive mode and community mode—and describes newly proposed applications as examples of each.

Context-Awareness in Mobile Commerce

2011 ◽  
pp. 123-129
Author(s):  
Jun Sun ◽  
Marshall Scott Poole
Keyword(s):  
Context Awareness ◽  
Classification Scheme ◽  
Service Providers ◽  
Cell Phones ◽  
Contextual Information ◽  
Information Service ◽  
Mobile Commerce ◽  
Context Aware ◽  
Interactive Mode ◽  
Multimedia Technologies

Advances in wireless network and multimedia technologies enable mobile commerce (m-commerce) information service providers to know the location and surroundings of mobile consumers through GPS-enabled and camera-embedded cell phones. Context awareness has great potential for creating new service modes and improving service quality in m-commerce. To develop and implement successful context-aware applications in m-commerce, it is critical to understand the concept of the “context” of mobile consumers and how to access and utilize contextual information in an appropriate way. This article dissects the context construct along both the behavioral and physical dimensions from the perspective of mobile consumers, developing a classification scheme for various types of consumer contexts. Based on this classification scheme, it discusses three types of context-aware applications—non-interactive mode, interactive mode and community mode—and describes newly proposed applications as examples of each.

scholarly journals Mutations ingyrAandgyrBamong Fluoroquinolone- and Multidrug-Resistant Mycobacterium tuberculosis Isolates

2016 ◽  
Vol 60 (4) ◽  
pp. 2090-2096 ◽  
Author(s):  
Jung-Yien Chien ◽  
Wei-Yih Chiu ◽  
Shun-Tien Chien ◽  
Chia-Jung Chiang ◽  
Chong-Jen Yu ◽  
...  
Keyword(s):  
Mycobacterium Tuberculosis ◽  
East Asian ◽  
Multidrug Resistant ◽  
Molecular Techniques ◽  
Content Type ◽  
Low Level ◽  
High Prevalence ◽  
Mdr Tb ◽  
High Level

ABSTRACTIn order to correlate the mutations inside the entiregyrAandgyrBgenes with the level of resistance to ofloxacin (OFX) and moxifloxacin (MFX) in isolates of multidrug-resistantMycobacterium tuberculosis(MDR-TB), a total of 111 isolates were categorized into OFX-susceptible (MIC, ≤2 μg/ml) and low-level (MIC, 4 to 8 μg/ml) and high-level (MIC, ≥16 μg/ml) OFX-resistant isolates and MFX-susceptible (MIC, ≤0.5 μg/ml) and low-level (MIC, 1 to 2 μg/ml) and high-level (MIC, ≥4 μg/ml) MFX-resistant isolates. Resistance-associated mutations inside thegyrAgene were found in 30.2% of OFX-susceptible and 72.5% and 72.2% of low-level and high-level OFX-resistant isolates and in 28.6% of MFX-susceptible and 58.1% and 83.9% of low-level and high-level MFX-resistant isolates. Compared with OFX-susceptible isolates, low-level and high-level OFX-resistant isolates had a significantly higher prevalence of mutations atgyrAcodons 88 to 94 (17.0%, 65.0%, and 72.2%, respectively;P< 0.001) and a higher prevalence of thegyrBG512R mutation (0.0%, 2.5%, and 16.7%, respectively;P= 0.006). Similarly, compared with MFX-susceptible isolates, low-level and high-level MFX-resistant isolates had a significantly higher prevalence of mutations atgyrAcodons 88 to 94 (14.3%, 51.6%, and 80.6%, respectively;P< 0.001) as well as a higher prevalence of thegyrBG512R mutation (0.0%, 0.0%, and 12.9%, respectively;P= 0.011). D94G and D94N mutations ingyrAand the G512R mutation ingyrBwere correlated with high-level MFX resistance, while the D94A mutation was associated with low-level MFX resistance. The prevalence of mutations atgyrAcodons 88 to 94 and thegyrBG512R mutation were higher among fluoroquinolone (FQ)-susceptible East Asian (Beijing) and Indo-Oceanic strains than they were among Euro-American strains, implying that molecular techniques to detect FQ resistance may be less specific in areas with a high prevalence of East Asian (Beijing) and Indo-Oceanic strains.

scholarly journals Resistance and Virulence Mechanisms of Escherichia coli Selected by Enrofloxacin in Chicken

2019 ◽  
Vol 63 (5) ◽  
Author(s):  
Jun Li ◽  
Haihong Hao ◽  
Menghong Dai ◽  
Heying Zhang ◽  
Jianan Ning ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Efflux Pumps ◽  
Genetic Alterations ◽  
Site Directed Mutagenesis ◽  
Single Mutation ◽  
Genetic Characteristics ◽  
Content Type ◽  
E Coli ◽  
Low Level ◽  
High Level

ABSTRACT This study aimed to investigate the genetic characteristics, antibiotic resistance patterns, and novel mechanisms involved in fluoroquinolone (FQ) resistance in commensal Escherichia coli isolates. The E. coli isolates were recovered from a previous clinical study and subjected to antimicrobial susceptibility testing and molecular typing. Known mechanisms of FQ resistance (target site mutations, plasmid-mediated quinolone resistance [PMQR] genes, relative expression levels of efflux pumps and porins) were detected using DNA sequencing of PCR products and real-time quantitative PCR. Whole-genome shotgun sequencing was performed on 11 representative strains to screen for single nucleotide polymorphisms (SNPs). The function of a key SNP (A1541G) was investigated by site-directed mutagenesis and allelic exchange. The results showed that long-term enrofloxacin treatment selected multidrug-resistant (MDR) E. coli isolates in the chicken gut and that these E. coli isolates had diverse genetic backgrounds. Multiple genetic alterations, including double mutations on GyrA (S83L and D87N), a single mutation on ParC (S80I) and ParE (S458E), activation of efflux pumps, and the presence of the QnrS1 protein, contributed to the high-level FQ resistance (enrofloxacin MIC [MICENR] ≥ 128 μg/ml), while the relatively low-level FQ resistance (MICENR = 8 or 16 μg/ml) was commonly mediated by decreased expression of the porin OmpF, besides enhancement of the efflux pumps. No significant relationship was observed between resistance mechanisms and virulence genes. Introduction of the A1541G mutation on aegA was able to increase FQ susceptibility by 2-fold. This study contributes to a better understanding of the development of MDR and the differences underlying the mechanisms of high-level and low-level FQ resistance in E. coli.

Fiscal decentralization in Korea

2018 ◽  
Vol 7 (3) ◽  
pp. 279-290 ◽  
Author(s):  
Im Gon Cho
Keyword(s):  
Local Governments ◽  
Central Government ◽  
Fiscal Decentralization ◽  
National Government ◽  
Policy Recommendations ◽  
Content Type ◽  
Low Level ◽  
Local Taxes ◽  
Local Municipalities ◽  
High Level

Purpose The purpose of this paper is to make policy recommendations for the current fiscal decentralization discussion by examining the operating mechanisms of local taxes, unconditional grants, and conditional grants within the fiscal relationships between the national government and local governments in Korea. Design/methodology/approach After examining the current fiscal relationships between the national government and the local governments, this paper analyzes trends of local taxes, unconditional grants from both national and high-level local governments, and conditional grants from both national and high-level (or provincial level) local governments between 2002 and 2015. Local governments are classified into high-level local governments, and three types of low-level local governments are: si, kun, and ku. Findings Since the structure of local government finances in Korea is very complicatedly intertwined, the present decentralization discussion regarding increasing the share of local tax revenues may not achieve its purpose of fiscal decentralization. The authorities in charge of revenue allocation should be first decentralized at high-level local governments; high-level local governments should then arrange unconditional and conditional grants from high-level local governments to low-level local governments while taking into consideration unconditional and conditional grants from the national government to low-level governments. Originality/value The dichotomy between the central government and local municipalities has been utilized in the existing discussion regarding fiscal decentralization in Korea, but this study highlights the important resource allocation roles of high-level local governments.

scholarly journals Context-Aware Image Inpainting with Learned Semantic Priors

2021 ◽  
Author(s):  
Wendong Zhang ◽  
Junwei Zhu ◽  
Ying Tai ◽  
Yunbo Wang ◽  
Wenqing Chu ◽  
...  
Keyword(s):  
State Of The Art ◽  
Contextual Information ◽  
Image Inpainting ◽  
Context Aware ◽  
Global Context ◽  
Low Level ◽  
Complex Scenes ◽  
Knowledge Distillation ◽  
Image Generator ◽  
High Level

Recent advances in image inpainting have shown impressive results for generating plausible visual details on rather simple backgrounds. However, for complex scenes, it is still challenging to restore reasonable contents as the contextual information within the missing regions tends to be ambiguous. To tackle this problem, we introduce pretext tasks that are semantically meaningful to estimating the missing contents. In particular, we perform knowledge distillation on pretext models and adapt the features to image inpainting. The learned semantic priors ought to be partially invariant between the high-level pretext task and low-level image inpainting, which not only help to understand the global context but also provide structural guidance for the restoration of local textures. Based on the semantic priors, we further propose a context-aware image inpainting model, which adaptively integrates global semantics and local features in a unified image generator. The semantic learner and the image generator are trained in an end-to-end manner. We name the model SPL to highlight its ability to learn and leverage semantic priors. It achieves the state of the art on Places2, CelebA, and Paris StreetView datasets

A service-oriented application creation process in ubiquitous environments

2017 ◽  
Vol 13 (3) ◽  
pp. 300-330 ◽  
Author(s):  
Hajer Taktak ◽  
Faouzi Moussa
Keyword(s):  
User Interface ◽  
User Interfaces ◽  
Code Generation ◽  
Context Awareness ◽  
Content Type ◽  
Interface Specification ◽  
Interface Generation ◽  
Pervasive Service ◽  
Service Oriented ◽  
User Interface Generation

Purpose Many features constitute an adaptive system such as user model, interface specification, business functionalities and service implementation. Context awareness is an important facet of service oriented application creation dealing with the gathering, use and representation of context information. Generally, user interfaces and services communities work separately on the adaptation process and do not converge. The aim of this work is to manage the system’s functionalities and the user interface that delivers data to the relevant consumer early since the design phase until the code generation. Design/methodology/approach The authors discuss how a unified method based on a model-driven architecture for adaptive user interface and pervasive service creation eases the work of designers and developers, limits incompatibility issues and supports dynamic generation of systems adapted to different contexts of use. Findings The proposed approach is able to support a semi-automatic ubiquitous application generation with service, behavior, presentation and content adaptation. Originality/value In this paper, the authors tackle context-awareness at two levels: system functionalities and user interface generation. The authors also tackle adaptation at the specification and implementation levels.

Brand balance: the effect of influencer brand encroachment on interactivity

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lara Hamdan ◽  
Seung Hwan (Mark) Lee
Keyword(s):  
Social Media ◽  
Experimental Study ◽  
Design Methodology ◽  
Mediating Effects ◽  
Personal Power ◽  
Content Type ◽  
Low Level ◽  
Social Media Platforms ◽  
High Level

PurposeAs social media platforms continue to have an increased presence in influencer marketing, researchers and practitioners are seeking ways to optimize the use of these platforms. The purpose of this study is to investigate the effect of brand encroachment, a level of brand's control over the promotion executed by social media influencers (SMIs), on the importance of interactivity of SMIs.Design/methodology/approachThis study examined the effect of brand encroachment on interactivity whilst examining the mediating effects of both passion and personal power. The study was an online, one-factor between-subjects design comparing high level of brand encroachment vs low level of brand encroachment.FindingsThe results of the experimental study suggest that as brand encroachment decreases, there is an increasing importance of being interactive. In addition, with lower brand encroachment, SMIs portray more personal power and passion toward the product or service being promoted.Originality/valueAs influencers create communities via increased levels of engagement, authenticity and relatability, it is of paramount importance that SMIs build relationships through interactivity in low-brand encroachment settings. Brands should offer more opportunities for SMIs to be interactive with their audience, while intrinsically building their personal power and passion as sources for these interactions.

Sign in / Sign up

Export Citation Format

Share Document