DR-NTU (Digital Repository of NTU)
Not a member yet
116018 research outputs found
Sort by
State-space systems as dynamic generative models
No full textA probabilistic framework to study the dependence structure induced by
deterministic discrete-time state-space systems between input and output
processes is introduced. General sufficient conditions are formulated under
which output processes exist and are unique once an input process has been
fixed, a property that in the deterministic state-space literature is known as
the echo state property. When those conditions are satisfied, the given
state-space system becomes a generative model for probabilistic dependences
between two sequence spaces. Moreover, those conditions guarantee that the
output depends continuously on the input when using the Wasserstein metric. The
output processes whose existence is proved are shown to be causal in a specific
sense and to generalize those studied in purely deterministic situations. The
results in this paper constitute a significant stochastic generalization of
sufficient conditions for the deterministic echo state property to hold, in the
sense that the stochastic echo state property can be satisfied under
contractivity conditions that are strictly weaker than those in deterministic
situations. This means that state-space systems can induce a purely
probabilistic dependence structure between input and output sequence spaces
even when there is no functional relation between those two spaces.Nanyang Technological UniversitySubmitted/Accepted versionThe authors acknowledge partial financial support from the School of Physical and Mathematical Sciences of the Nanyang Technological University. The second author is funded by an Eric and Wendy Schmidt AI in Science Postdoctoral Fellowship at the Nanyang Technological University
Capture the flag challenge design and implementation
No full textCapture The Flag (CTF) challenges are an engaging way for students to practice cybersecurity skills in a real-life setting. CTF challenges are used in the SC4012 Software Security course for students to compete against each other by applying their knowledge and skills learn from the course. This Final Year Project (FYP) focuses on the design and implementation of 10 CTF challenges which covers various cybersecurity domains that are taught in the SC4012 Software Security course.Bachelor's degre
Stakeholder perspectives in resolving challenges to implement security technologies for high-security installations in Singapore
No full textIt is essential to examine the benefits of physical security technologies for adversary threat
detection and prevention to identify challenges that impact the cost and operational aspects of
the users. There are limited scholarly articles on implementing security technologies, and they
are paltry in the Singapore context. Therefore, this paper reviews articles related to user
concerns on security and technology issues, then critically evaluates the viability of the
perspectives derived by drawing relevant articles, in particular, keywords akin to the theme
such as "Security Challenges", "Security Technology", "Technology Risk", and “Technology
Project Management”. Furthermore, the research engaged security practitioners in Singapore
through a quantitative survey with selected individuals for further qualitative interviews based
on outlier responses to determine their challenges in implementing security technologies, such
as long-term cost sustainability, technology complexity, and project management competency.
Eventually, the paper draws the users’ perspective on the potential solutions to the identified
challenges, such as proper requirement design to determine the outcome and manage cost,
proper stakeholder management to improve communication and align expectations to minimise
system complications. Nonetheless, the paper identified potential future work involving
security practitioners from other commercial industries such as healthcare, retail, and
transportation.Master's degre
Are we BTO-kay?: An exploratory study into citizen perceptions of Singapore public housing.
No full textPublic housing in Singapore is hailed as a success with one of the highest homeownership rates in the world, however such metrics are based on broad, objective measures that veil the subjective realities faced by those who engage with the housing process. This study investigates the factors that influence young Singaporeans’ satisfaction with the BTO scheme. Using a qualitative design comprising fifteen semi-structured interviews, the study investigates perceptions of housing affordability, accessibility, and normative attitudes towards housing. The results show that accessibility is a key concern; while there are regular opportunities to apply for housing, supply is often outstripped by demand and the existing balloting system can inadvertently leave some couples trying for multiple years without success. Several strategies are outlined to reduce the friction associated with the BTO process and to improve accessibility to housing.Bachelor's degre
Misty robot
No full textThis project is inspired by and aims to improve on a former project done by Mr Karishein Chandran, project number SCSE23-0859. Following in the footsteps of Mr Chandran, this project has similarities in terms of it also being a customer service and QR recognition one. However, an offline approach was taken to make this Misty robot and Raspberry Pi (RPi) combination a standalone system that can be used anywhere regardless of internet connection.
This project still employs fundamental built-in capabilities of Misty coupled with a RPi to provide customers with an interactive registration experience. However, given the offline restrictions placed on this project, the Misty-RPi system’s resources are utilized maximally and efficiently to provide an experience not dissimilar to having an internet connection. This project involves the following components: a Misty II Robot, a HTTP website to interact with Misty and keeping track of customers’ registration status and an SQLite3 database for storing customers’ information.
This project provides an opportunity for event planners alike to deploy in areas even without internet connection. Furthermore, this project holds the foundation for future development of this Misty-RPi system which can be extended and scaled to fit the situation as needed.Bachelor's degre
Enhancing campus lost and found: a full-stack prototype solution bridging official systems and student initiatives
No full textThis is a final year implementation-based project for a full-stack solution application for handling lost items in the campus of Nanyang Technological University(NTU). The project and report cover a comprehensive analysis into the current status quo of how missing items are handled in Singapore’s University campuses on the official level, as well as student-led initiatives on the student community level. From there, unaddressed gaps are analyzed and translated into functional and nonfunctional requirements that best suit the needs of students and staff. The application includes a fully functional prototype, consisting of frontend, backend, scalable cloud storage solution, caching system and authorization & authentication mechanism etc. The report also goes into detail of each design consideration, as well as more theoretical concepts like database read/write patterns, the traditional relational vs non-relational schema considerations as well as caching strategies when designing the application. Other good software practices and related software testing concepts are also introduced as part of usability testing. The project serves as a prototype that could be adapted for broader institutional use, offering a seamless and effective solution for lost-and-found item management.Bachelor's degre
From pixels to persons: cultivation through video games
No full textIn recent decades, the video game industry has experienced gargantuan growth, outsizing both the music and film industries. Yet, concerns about its value within society have endured, with critics such as Nozick, Caillois, and Baudrillard targeting the transient and fictional nature of video games, which defenders including Grant Tavinor rebuff, asserting the intrinsic and instrumental video games bring to individuals.
This thesis expands on this discourse by proposing a tripartite of value categories of video games – tests of skill and character, education, and social community. Case studies ranging from Minecraft to Call of Duty will assist in not only justifying these value categories, but also in addressing its potential objections that draw on the alleged correlation and causation to real-world violence, which too are questionable. A framework for identifying highly valuable video games based on key metrics like social involvement, in-game consequences, and real-world opportunities, will be offered, while stressing the increasing challenge of age restriction enforcement that highlights a parallel increase in parental responsibility in fostering healthy engagement with video games. Ultimately, this thesis elucidates the irreplaceably unique potential of video games to be a catalyst for growth, not only individually, but societally, through promoting controversy, introspection, and discourse.Bachelor's degre
Exploring the impact of doubly selective fading channels for communication systems
No full textThis dissertation investigates the performance of orthogonal frequency division multiplexing (OFDM) systems under doubly selective fading channels. Standardized and custom multipath fading models were simulated to reflect realistic high-mobility environments. Several pilot-aided channel estimation and equalization methods—Least Squares (LS), Minimum Mean Square Error (MMSE), as well as Linear MMSE (LMMSE) with singular value decomposition (SVD) truncation—were evaluated under both block-type and comb-type pilot schemes.
Simulation results demonstrate that combining LMMSE estimation with interleaved comb-type pilot insertion yields reliable performance while reducing complexity. Additionally, an interleaved comb-type pilot structure was proposed and shown to enhance robustness against severe multipath and fast fading conditions.Master's degre
Decentralized inertia emulation and stability analysis in AC/DC hybrid microgrids
No full textAs the integration of renewable energy sources (RESs) like wind and solar
power continues to rise, the system inertia provided by traditional synchronous
generators (SGs) decreases. This reduction in system inertia causes significant
challenges to frequency stability in power systems. As important indices for
evaluating system stability, frequency and rate of change of frequency (RoCoF)
are very important. To address this challenge, many methods have been
proposed, such as energy storage systems (ESS), virtual inertia control
methods, and so on.
First, a decentralized inertia emulation method in a hybrid microgrid is
proposed. This new method can provide virtual inertia without communication
between the AC and DC sides. This method can calculate the AC side's RoCoF
information based on the information from the DC side. In this section, traditional
frequency regulation is analyzed. Then, the system structure and virtual inertia
principles are discussed. Next, a mathematical model of the control strategy of
this new method is analyzed, including its control strategy and its controller
design. Finally, simulation results prove the effectiveness of this method.
This thesis discusses the impact of AC and DC distribution lines on system
stability based on the proposed method in a hybrid microgrid. The principles and
several mathematical models of distribution lines are discussed in this section.
Then, a mathematical analysis of the proposed method considering the DC
distribution line is discussed. Simulations considering the parameters of 500-
meter AC distribution lines and 500-meter DC distribution lines are shown and
analyzed respectively.
Overall, this thesis focuses on inertia emulation and stability analysis of a
power system. Finally, this thesis discusses future work.Master's degre
Is the extended mind hypothesis plausible?
No full textIn this paper, I consider the Extended Mind Hypothesis (EMH), and argue that it is plausible. I first introduce the EMH as argued by Clark and Chalmers, which proposes that part of the mind, and therefore cognition, can be constituted by factors external to the body, and explain why it seems to be true. I then introduce two objections to the EMH, which claim that external factors cannot constitute cognition or produce cognition. Next, I refute these objections, as the processes performed by external factors can be cognitive if they fulfil Rowlands’ criterion of the cognitive. Afterwards, I explain an objection which demonstrates the criterion’s inadequacy in proving one’s ownership of external factors, and its excessive liberalism in accepting objects as a part of the mind. I then concede that the EMH in its current form, being grounded on liberal functionalism, cannot be shown to be plausible. I proceed to propose that the EMH is plausible when argued from the basis of traditional functionalism. I argue this with a thought experiment involving a sufficiently advanced information processor. I finally refute Searle’s potential challenge to my proposal, and conclude that the EMH is plausible when based on traditional functionalism.Bachelor's degre