scholarly journals When Location-Based Services Meet Databases

2005 ◽  
Vol 1 (2) ◽  
pp. 81-90 ◽  
Author(s):  
Dik Lun Lee ◽  
Manli Zhu ◽  
Haibo Hu
Keyword(s):  
Query Optimization ◽  
Physical Environment ◽  
Scale Up ◽  
Physical Space ◽  
Location Based Services ◽  
Location Data ◽  
Spatial Locality ◽  
Database Research ◽  
Location Modeling ◽  
High Level

As location-based services (LBSs) grow to support a larger and larger user community and to provide more and more intelligent services, they must face a few fundamental challenges, including the ability to not only accept coordinates as location data but also manipulate high-level semantics of the physical environment. They must also handle a large amount of location updates and client requests and be able to scale up as their coverage increases. This paper describes some of our research in location modeling and updates and techniques for enhancing system performance by caching and batch processing. It can be observed that the challenges facing LBSs share a lot of similarity with traditional database research (i.e., data modeling, indexing, caching, and query optimization) but the fact that LBSs are built into the physical space and the opportunity to exploit spatial locality in system design shed new light on LBS research.

scholarly journals Tell Me Where You Are and I’ll Tell You What You Want: Using Location Data to Improve Marketing Decisions

2016 ◽  
Vol 8 (2) ◽  
pp. 30-37 ◽  
Author(s):  
Martin Spann ◽  
Dominik Molitor ◽  
Stephan Daurer
Keyword(s):  
Dynamic Pricing ◽  
Large Scale ◽  
Scale Up ◽  
Location Based Services ◽  
Location Data ◽  
Pricing Decisions ◽  
Store Design ◽  
Targeted Pricing ◽  
Past Data ◽  
Common Application

Abstract Location data has become more and more accessible. Smartphone applications such as location-based services collect location data on a large scale. Up to now, most approaches have relied on past data, but new developments in machine learning and artificial intelligence will soon enable more dynamic real-time use of location data. Companies that embrace these technologies will be able to create competitive advantages. Location data offers great potential to improve a variety of marketing decisions such as targeted pricing and advertising, store locations and in-store layout. Location based advertising is currently the most common application. It allows targeting all customers within a certain distance of a store. Besides advertising, location data can be used for dynamic pricing decisions. Customers close to competitor’s locations can be charged a lower price for particular products via discounts in order to reduce switching costs. Indoor tracking can help to optimize store design or the positioning of categories and brands. Granular location data about consumers’ movements hence further allows for minimizing potential offline transaction costs based on the distances to stores.

Re-centering the Cinema Experience in a Multi-Platform, Digital Age

2015 ◽  
Vol 8 (5) ◽  
Author(s):  
E. W. Nikdel
Keyword(s):  
Physical Environment ◽  
Cultural Memory ◽  
Emotional Response ◽  
Physical Space ◽  
Film History ◽  
Cultural Activity ◽  
Film Culture ◽  
The Past ◽  
Imminent Death ◽  
Multiple Media

With the advent of online distribution and the rise of multiple media devices, claims of the cinema’s imminent death have surfaced with greater intensity than ever before. Of course, with an ever-widening array of platforms these accounts have placed a newfound emphasis on the cinema as a distinctive physical space, one that plays host to a very particular and much cherished cultural activity. This article considers the substance of these claims by tracing a very particular historical route. Firstly, be revisiting Baudry’s notion of the dispositif, this article detects the importance of the physical environment in the process of film consumption. Secondly, I relate this emphasis on the physical to the traditional notion of the cinephile, a practice that ritualises the cinema experience. Many accounts across the spectrum of film history will attest to the profound ways in which the physical experience of the cinema summons a rich emotional response. Lastly, I consider how the cinema and the collective nature of film consumption provides an authentic trace to the past and a very certain time and place in history. In turn, despite competition from cheaper and more convenient platforms, this article will endeavour to show how the cinema retains its place at the centre of contemporary film culture. KEYWORDS Cinema, dispositif, cinephilia, cultural memory.

scholarly journals Query Rewriting for Incremental Continuous Query Evaluation in HIFUN

Algorithms ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 149
Author(s):  
Petros Zervoudakis ◽  
Haridimos Kondylakis ◽  
Nicolas Spyratos ◽  
Dimitris Plexousakis
Keyword(s):  
Query Optimization ◽  
Query Language ◽  
Computational Cost ◽  
Continuous Queries ◽  
Continuous Query ◽  
Query Rewriting ◽  
Query Evaluation ◽  
Clear Separation ◽  
Complete Dataset ◽  
High Level

HIFUN is a high-level query language for expressing analytic queries of big datasets, offering a clear separation between the conceptual layer, where analytic queries are defined independently of the nature and location of data, and the physical layer, where queries are evaluated. In this paper, we present a methodology based on the HIFUN language, and the corresponding algorithms for the incremental evaluation of continuous queries. In essence, our approach is able to process the most recent data batch by exploiting already computed information, without requiring the evaluation of the query over the complete dataset. We present the generic algorithm which we translated to both SQL and MapReduce using SPARK; it implements various query rewriting methods. We demonstrate the effectiveness of our approach in temrs of query answering efficiency. Finally, we show that by exploiting the formal query rewriting methods of HIFUN, we can further reduce the computational cost, adding another layer of query optimization to our implementation.

scholarly journals Community Integration After Traumatic Brain Injury and Related Factors: A Study in the Nepalese Context

2020 ◽  
Vol 6 ◽  
pp. 237796082098178
Author(s):  
Sumana Lama ◽  
Jintana Damkliang ◽  
Luppana Kitrungrote
Keyword(s):  
Social Support ◽  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Health Care Providers ◽  
Physical Environment ◽  
Community Integration ◽  
Sampling Technique ◽  
Care Providers ◽  
Related Factors ◽  
High Level

Introduction Community integration is an essential component for rehabilitation among traumatic brain injury (TBI) survivors, which yields positive outcomes in terms of social activities, community participation, and productive work. A factor that usually facilitates community integration among TBI survivors is social support, whereas physical environment and fatigue are most often found as barriers. Objectives This study aimed to (1) describe the level of community integration, fatigue, physical environment, and social support of persons after TBI, and (2) examine the relationship between community integration and these three factors. Methods This is a descriptive correlational study. One hundred and twenty TBI survivors living in the communities of Province Number Three, Nepal were enrolled using the stratified sampling technique. The data were collected using the Community Integration Questionnaire, Modified Fatigue Impact Scale, Craig Hospital Inventory of Environmental Factors, and the Multidimensional Scale of Perceived Social Support. Descriptive statistics and Pearson’s correlation were used to analyze the data. Results Community integration, fatigue, and physical environment showed a moderate level, while social support revealed a high level. Fatigue was significantly correlated with overall community integration, whereas physical environment was found to correlate with two subscales of community integration, home integration and productive activities. Conclusion To enhance the level of community integration among TBI survivors, health care providers, in particular rehabilitation nurses and community nurses, should plan and implement strategies such as follow-up appointments or continued rehabilitation at home.

scholarly journals Privacy vs. Reward in Indoor Location-Based Services

2016 ◽  
Vol 2016 (4) ◽  
pp. 102-122 ◽  
Author(s):  
Kassem Fawaz ◽  
Kyu-Han Kim ◽  
Kang G. Shin
Keyword(s):  
Location Privacy ◽  
Indoor Localization ◽  
Service Providers ◽  
Location Based Services ◽  
Location Information ◽  
Privacy Concerns ◽  
Indoor Location ◽  
Location Data ◽  
Personalized Services ◽  
Privacy Risks

AbstractWith the advance of indoor localization technology, indoor location-based services (ILBS) are gaining popularity. They, however, accompany privacy concerns. ILBS providers track the users’ mobility to learn more about their behavior, and then provide them with improved and personalized services. Our survey of 200 individuals highlighted their concerns about this tracking for potential leakage of their personal/private traits, but also showed their willingness to accept reduced tracking for improved service. In this paper, we propose PR-LBS (Privacy vs. Reward for Location-Based Service), a system that addresses these seemingly conflicting requirements by balancing the users’ privacy concerns and the benefits of sharing location information in indoor location tracking environments. PR-LBS relies on a novel location-privacy criterion to quantify the privacy risks pertaining to sharing indoor location information. It also employs a repeated play model to ensure that the received service is proportionate to the privacy risk. We implement and evaluate PR-LBS extensively with various real-world user mobility traces. Results show that PR-LBS has low overhead, protects the users’ privacy, and makes a good tradeoff between the quality of service for the users and the utility of shared location data for service providers.

scholarly journals Complying with Privacy Legislation: From Legal Text to Implementation of Privacy-Aware Location-Based Services

2018 ◽  
Vol 7 (11) ◽  
pp. 442 ◽  
Author(s):  
Mehrnaz Ataei ◽  
Auriol Degbelo ◽  
Christian Kray ◽  
Vitor Santos
Keyword(s):  
Data Privacy ◽  
Location Privacy ◽  
Service Providers ◽  
Location Based Services ◽  
Legal Text ◽  
General Data Protection Regulation ◽  
Location Data ◽  
Privacy Laws ◽  
Technical Issues ◽  
General Data

An individual’s location data is very sensitive geoinformation. While its disclosure is necessary, e.g., to provide location-based services (LBS), it also facilitates deep insights into the lives of LBS users as well as various attacks on these users. Location privacy threats can be mitigated through privacy regulations such as the General Data Protection Regulation (GDPR), which was introduced recently and harmonises data privacy laws across Europe. While the GDPR is meant to protect users’ privacy, the main problem is that it does not provide explicit guidelines for designers and developers about how to build systems that comply with it. In order to bridge this gap, we systematically analysed the legal text, carried out expert interviews, and ran a nine-week-long take-home study with four developers. We particularly focused on user-facing issues, as these have received little attention compared to technical issues. Our main contributions are a list of aspects from the legal text of the GDPR that can be tackled at the user interface level and a set of guidelines on how to realise this. Our results can help service providers, designers and developers of applications dealing with location information from human users to comply with the GDPR.

scholarly journals High-Level Synthesis Design for Stencil Computations on FPGA with High Bandwidth Memory

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1275
Author(s):  
Changdao Du ◽  
Yoshiki Yamaguchi
Keyword(s):  
Programming Languages ◽  
High Performance ◽  
Design Space Exploration ◽  
Scale Up ◽  
High Level Synthesis ◽  
Stencil Computations ◽  
Temporal Domain ◽  
High Bandwidth ◽  
Promising Solution ◽  
High Level

Due to performance and energy requirements, FPGA-based accelerators have become a promising solution for high-performance computations. Meanwhile, with the help of high-level synthesis (HLS) compilers, FPGA can be programmed using common programming languages such as C, C++, or OpenCL, thereby improving design efficiency and portability. Stencil computations are significant kernels in various scientific applications. In this paper, we introduce an architecture design for implementing stencil kernels on state-of-the-art FPGA with high bandwidth memory (HBM). Traditional FPGAs are usually equipped with external memory, e.g., DDR3 or DDR4, which limits the design space exploration in the spatial domain of stencil kernels. Therefore, many previous studies mainly relied on exploiting parallelism in the temporal domain to eliminate the bandwidth limitations. In our approach, we scale-up the design performance by considering both the spatial and temporal parallelism of the stencil kernel equally. We also discuss the design portability among different HLS compilers. We use typical stencil kernels to evaluate our design on a Xilinx U280 FPGA board and compare the results with other existing studies. By adopting our method, developers can take broad parallelization strategies based on specific FPGA resources to improve performance.

scholarly journals Classroom Re-design to Facilitate Student Learning: A Case Study of Changes to a University Classroom

2016 ◽  
Vol 16 (1) ◽  
pp. 53-68 ◽  
Author(s):  
Tom Perks ◽  
Doug Orr ◽  
Elham Al-Omari
Keyword(s):  
Student Satisfaction ◽  
Physical Environment ◽  
Teaching And Learning ◽  
Physical Space ◽  
Learning Space ◽  
Effective Learning ◽  
Group Data ◽  
Focus Group Data ◽  
Teaching Learning

This case study examines the physical aspects of a particular university classroom, and what affect specific changes to the classroom had on the perceptions of students, instructors and observers regarding the room as an effective learning space. We compare survey and focus group data collected from students taking courses in the classroom prior to changes to the physical environment with comparable data from students taking courses in the same classroom after specific changes had been made. Immediately following changes to the classroom, notable increases were observed in reported perceptions of student satisfaction with the physical environment, including perceptions of the classroom as a more effective and engaging learning space. Similar perceptions of improvement as a teaching-learning space were reported by instructors and observers. However, subsequent follow-up data collection and analyses suggested little if any sustained increase in perceptions of efficacy of the room as a learning space; indeed, most reported variables returned to baseline levels. The implications of these findings and their relevance to classroom design nevertheless may provide insight regarding the manner in which physical space might support or even enhance teaching and learning.

Handling High-Level Queries in Location-Based Services for User Groups

2006 ◽  
Vol 10 (2) ◽  
pp. 213-234 ◽  
Author(s):  
Panayotis Partsinevelos ◽  
Nectaria Tryfona
Keyword(s):  
Location Based Services ◽  
User Groups ◽  
High Level

Urgent need to address the slow scale-up of TB preventive treatment in the WHO South-East Asia Region

2021 ◽  
Vol 25 (5) ◽  
pp. 382-387
Author(s):  
S. Satyanarayana ◽  
V. Bhatia ◽  
P. P. Mandal ◽  
A. Kanchar ◽  
D. Falzon ◽  
...  
Keyword(s):  
High Risk ◽  
East Asia ◽  
Scale Up ◽  
Preventive Treatment ◽  
People Living With Hiv ◽  
South East Asia ◽  
High Level ◽  
Almost All ◽  
Living With Hiv ◽  
East Asia Region

In September 2018, all countries made a commitment at the first ever United Nations High‐Level Meeting (UNHLM) on TB, to provide TB preventive treatment (TPT) to at least 30 million people at high‐risk of TB disease between 2018 and 2022. In the WHO South‐East Asia Region (SEA Region), which accounts for 44% of the global TB burden, only 1.2 million high‐risk individuals (household contacts and people living with HIV) were provided TPT (11% of the 10.8 million regional UNHLM TPT target) in 2018 and 2019. By 2020, almost all 11 countries of the SEA Region had revised their policies on TPT target groups and criteria to assess TPT eligibility, and had adopted at least one shorter TPT regimen recommended in the latest WHO TPT guidelines. The major challenges for TPT scale‐up in the SEA Region are resource shortages, knowledge and service delivery/uptake gaps among providers and service recipients, and the lack of adequate quantities of rifapentine for use in shorter TPT regimens. There are several regional opportunities to address these gaps and countries of the SEA Region must make use of these opportunities to scale up TPT services rapidly to reduce the TB burden in the SEA Region.

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