278 research outputs found
The Real Deal: A Review of Challenges and Opportunities in Moving Reinforcement Learning-Based Traffic Signal Control Systems Towards Reality
Traffic signal control (TSC) is a high-stakes domain that is growing in
importance as traffic volume grows globally. An increasing number of works are
applying reinforcement learning (RL) to TSC; RL can draw on an abundance of
traffic data to improve signalling efficiency. However, RL-based signal
controllers have never been deployed. In this work, we provide the first review
of challenges that must be addressed before RL can be deployed for TSC. We
focus on four challenges involving (1) uncertainty in detection, (2)
reliability of communications, (3) compliance and interpretability, and (4)
heterogeneous road users. We show that the literature on RL-based TSC has made
some progress towards addressing each challenge. However, more work should take
a systems thinking approach that considers the impacts of other pipeline
components on RL.Comment: 26 pages; accepted version, with shortened version published at the
12th International Workshop on Agents in Traffic and Transportation (ATT '22)
at IJCAI 202
Commonsense Knowledge in Sentiment Analysis of Ordinance Reactions for Smart Governance
Smart Governance is an emerging research area which has attracted scientific as well as policy interests, and aims to improve collaboration between government and citizens, as well as other stakeholders. Our project aims to enable lawmakers to incorporate data driven decision making in enacting ordinances. Our first objective is to create a mechanism for mapping ordinances (local laws) and tweets to Smart City Characteristics (SCC). The use of SCC has allowed us to create a mapping between a huge number of ordinances and tweets, and the use of Commonsense Knowledge (CSK) has allowed us to utilize human judgment in mapping.
We have then enhanced the mapping technique to link multiple tweets to SCC. In order to promote transparency in government through increased public participation, we have conducted sentiment analysis of tweets in order to evaluate the opinion of the public with respect to ordinances passed in a particular region.
Our final objective is to develop a mapping algorithm in order to directly relate ordinances to tweets. In order to fulfill this objective, we have developed a mapping technique known as TOLCS (Tweets Ordinance Linkage by Commonsense and Semantics). This technique uses pragmatic aspects in Commonsense Knowledge as well as semantic aspects by domain knowledge. By reducing the sample space of big data to be processed, this method represents an efficient way to accomplish this task.
The ultimate goal of the project is to see how closely a given region is heading towards the concept of Smart City
Crime Detection Using Sentiment Analysis
Women and girls have been subjected to a great deal of violence and harassment in public locations around the country, ranging from stalking to abuse harassment and assault. This research paper examines the role of social media in improving women's safety in Indian cities, with a focus on the use of social media websites and apps such as Twitter, Facebook, and Instagram. This research also looks at how ordinary Indians can develop a sense of responsibility in Indian society so that we can focus on the protection of women in their surroundings. Tweets on the safety of women in Indian cities, which often include images and text as well as written phrases and quotations, can be used to send a message to the Indian youth culture and encourage them to take harsh action and punish those who harass women. Twitter and other Twitter handles that feature hash tag messages are extensively used throughout the world as a channel for women to share their feelings about how they feel when going to work or travelling by public transportation and what is their mental condition when they are surrounded by unknown males, and do they feel safe or not
Mining Social Media and Structured Data in Urban Environmental Management to Develop Smart Cities
This research presented the deployment of data mining on social media and structured data in urban studies. We analyzed urban relocation, air quality and traffic parameters on multicity data as early work. We applied the data mining techniques of association rules, clustering and classification on urban legislative history. Results showed that data mining could produce meaningful knowledge to support urban management. We treated ordinances (local laws) and the tweets about them as indicators to assess urban policy and public opinion. Hence, we conducted ordinance and tweet mining including sentiment analysis of tweets. This part of the study focused on NYC with a goal of assessing how well it heads towards a smart city. We built domain-specific knowledge bases according to widely accepted smart city characteristics, incorporating commonsense knowledge sources for ordinance-tweet mapping. We developed decision support tools on multiple platforms using the knowledge discovered to guide urban management. Our research is a concrete step in harnessing the power of data mining in urban studies to enhance smart city development
UUKG: Unified Urban Knowledge Graph Dataset for Urban Spatiotemporal Prediction
Accurate Urban SpatioTemporal Prediction (USTP) is of great importance to the
development and operation of the smart city. As an emerging building block,
multi-sourced urban data are usually integrated as urban knowledge graphs
(UrbanKGs) to provide critical knowledge for urban spatiotemporal prediction
models. However, existing UrbanKGs are often tailored for specific downstream
prediction tasks and are not publicly available, which limits the potential
advancement. This paper presents UUKG, the unified urban knowledge graph
dataset for knowledge-enhanced urban spatiotemporal predictions. Specifically,
we first construct UrbanKGs consisting of millions of triplets for two
metropolises by connecting heterogeneous urban entities such as administrative
boroughs, POIs, and road segments. Moreover, we conduct qualitative and
quantitative analysis on constructed UrbanKGs and uncover diverse high-order
structural patterns, such as hierarchies and cycles, that can be leveraged to
benefit downstream USTP tasks. To validate and facilitate the use of UrbanKGs,
we implement and evaluate 15 KG embedding methods on the KG completion task and
integrate the learned KG embeddings into 9 spatiotemporal models for five
different USTP tasks. The extensive experimental results not only provide
benchmarks of knowledge-enhanced USTP models under different task settings but
also highlight the potential of state-of-the-art high-order structure-aware
UrbanKG embedding methods. We hope the proposed UUKG fosters research on urban
knowledge graphs and broad smart city applications. The dataset and source code
are available at https://github.com/usail-hkust/UUKG/.Comment: NeurIPS 2023 Track on Datasets and Benchmark
Advanced Semantics for Commonsense Knowledge Extraction
Commonsense knowledge (CSK) about concepts and their properties is useful for
AI applications such as robust chatbots. Prior works like ConceptNet, TupleKB
and others compiled large CSK collections, but are restricted in their
expressiveness to subject-predicate-object (SPO) triples with simple concepts
for S and monolithic strings for P and O. Also, these projects have either
prioritized precision or recall, but hardly reconcile these complementary
goals. This paper presents a methodology, called Ascent, to automatically build
a large-scale knowledge base (KB) of CSK assertions, with advanced
expressiveness and both better precision and recall than prior works. Ascent
goes beyond triples by capturing composite concepts with subgroups and aspects,
and by refining assertions with semantic facets. The latter are important to
express temporal and spatial validity of assertions and further qualifiers.
Ascent combines open information extraction with judicious cleaning using
language models. Intrinsic evaluation shows the superior size and quality of
the Ascent KB, and an extrinsic evaluation for QA-support tasks underlines the
benefits of Ascent.Comment: Web interface available at https://ascent.mpi-inf.mpg.d
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