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Adaptive computation is of great importance in numerical simulations. The ideas for adaptive computations can be dated back to adaptive finite element methods in 1970s. In this talk, we shall first review some recent development for adaptive methods with some application. Then, we will propose a deep adaptive sampling method for solving PDEs where deep neural networks are utilized to approximate the solutions. In particular, we propose the failure informed PINNs (FI-PINNs), which can adaptively refine the training set with the goal of reducing the failure probability. Compared with the neural network approximation obtained with uniformly distributed collocation points, the proposed algorithms can significantly improve the accuracy, especially for low regularity and high-dimensional problems.
Event date: 18/10/2022
Speaker: Prof. Tao Tang (Beijing Normal University-Hong Kong Baptist University United International College)
Hosted by: Department of Applied Mathematics
- Subjects:
- Mathematics and Statistics
- Keywords:
- Sampling (Statistics) Differential equations Partial -- Numerical solutions Mathematical models Adaptive computing systems
- Resource Type:
- Video
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Video
Machine learning can deliver unprecedented performance. Its application domain has expanded into safety-critical cyber-physical systems such as UAVs and self-driver cars. However, the safety assurance of vehicular control has two conditions: 1) an analytical model of system behaviors such as provable stability, and 2) the software safety certification process (e.g., DO 178C) requires that the software be simple enough so that software safety can be validated by a combination of model checking and near exhaustive testing. Although ML software, as is, does not meet these two safety requirements, the real-time physics model supervised ML architecture holds the promise to 1) meet the two safety requirements and 2) enable ML software to safely improve control performance and safely learn from its experience in real-time. This talk will review the structure of the proposed architecture and some methods to embed physics into ML-enabled CPS control.
Event Date: 12/05/2022
Speaker: Prof. Lui Sha (University of Illinois Urbana-Champaign)
Hosted by: Graduate School
- Subjects:
- Aeronautical and Aviation Engineering and Computing
- Keywords:
- Machine learning Vehicles Remotely piloted Computer software -- Reliability Drone aircraft
- Resource Type:
- Video
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Video
Before the advent of computers around 1950, optimization centered either on small-dimensional problems solved by looking at zeroes of first derivatives and signs of second derivatives, or on infinite-dimensional problems about curves and surfaces. In both cases, "variations" were employed to understand how a local solution might be characterized. Computers changed the picture by opening the possibility of solving large-scale problems involving inequalities, instead of only equations. Inequalities had to be recognized as important because the decisions to be optimized were constrained by the need to respect many upper or lower bounds on their feasibility. A new kind of mathematical analysis, beyond traditional calculus, had to be developed to address these needs. It built first on appealing to the convexity of sets and functions, but went on to amazingly broad and successful concepts of variational geometry, subgradients, subderivatives, and variational convergence beyond just that. This talk will explain these revolutionary developments and why there were essential.
Event date: 1/11/2022
Speaker: Prof. Terry Rockafellar (University of Washington)
Hosted by: Department of Applied Mathematics
- Subjects:
- Mathematics and Statistics
- Keywords:
- Convex functions Convex sets Mathematical optimization Computer science -- Mathematics
- Resource Type:
- Video
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Video
The Palace Museum houses a collection of national treasures, which are not only rare and precious artworks, but also serve as vehicles for Chinese philosophy and culture. Since its establishment, the Palace Museum has taken preserving and carrying the Chinese cultural heritage forward as its core mission. In the past few decades, the Palace Museum has endeavoured to activate its collection and make the museum more connected and relevant to the world beyond the museum walls. As a bridge between the past and the present, China and the world, the Hong Kong Palace Museum is committed to the study and appreciation of Chinese art and culture. With a Hong Kong perspective and a global vision, the Museum interprets the Palace Museum’s collection and its culture and presents the essence of Chinese culture and values to a global audience, while advancing dialogue and mutual learning among world civilizations. In this PolyU 85th Anniversary Public Lecture, we are honored to have Dr Louis Ng Chi-wa, the first Director of Hong Kong Palace Museum, presents a public lecture, A New Vision for Carrying the Traditional Culture Forward. We sincerely invite you to embark on a journey exploring cultural heritage through the lecture.
故宮的文物收藏是國之重寶，不僅是藝術珍玩，還有以器明道的文化意義。故宮博物院自成立以來，一直以傳承中華文化為使命。新時代的故宮致力把文物活起來，從館舍天地走向大千世界。香港故宮繼往開來，定位於連繫古今，融通中外，以香港角度，結合環球視野，詮釋故宮文物和文化。香港故宮並致力走向世界，宣揚中國文化的普世價值，推動文化對話和文明互鑑。理大八十五周年校慶公開講座有幸邀請香港故宮文化博物館館長吳志華博士與大家分享「文化傳承的新視野」，一起展開文化傳承之旅。
Event Date: 22.10.2022
- Keywords:
- Art Chinese Historic preservation Civilization Cultural property
- Resource Type:
- Video
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Video
University education nowadays focuses more on the promotion of students’ knowledge and professional qualifications, as compared to the cultivation of their morals and values. In fact, all the above are equally crucial to whole-person development. In this PolyU 85th Anniversary Public Lecture, we are honored to have Prof. Poon Chung-kwong share with us the relationship between knowledge and self-cultivation, and how they complement each other to fulfill the ultimate purpose of education.
大學教育近年來較著重提升學生的知識與專業水平，品德培養的比重相對較少。事實上全人教育涵蓋以上各方面，缺一不可。理大八十五周年校慶公開講座特別邀了理大榮休校長潘宗光教授與大家暢談學問與修養的關係。兩者兼備，相輔相成，才是教育的最高目標。
Event Date: 16.09.2022
- Keywords:
- College students -- Attitudes College students -- Conduct of life
- Resource Type:
- Video
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Video
What is your dream? And how to make it come true? Ms Guo Jingjing, the Olympic Gold Medalist, will share with us her story of chasing dreams.
你的夢想是什麼？你有好好努力使它實現嗎？奧運金牌得主郭晶晶女士將與大家分享她追逐夢想的故事。
Event Date: 22.11.2022
- Keywords:
- China Athletes -- Training of Diving
- Resource Type:
- Video
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Video
A chance to have dialogue and interactive match with an Olympic Gold Medalist! On 17 December, the renowned foil fencing athlete and Olympic champion, Mr Cheung Ka-long, will have a live chat at PolyU where he will share details about his athletic and personal life with participants.
一起與奧運金牌運動員在校園對話、台上較量﹗香港著名劍擊運動員張家朗將於12月17日蒞臨 理大 校園，與一眾與會者暢談他在劍術內外的生活點滴。
- Keywords:
- Fencing China -- Hong Kong 張家朗 1997- Fencers Athletes -- Training of
- Resource Type:
- Video
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Video
Geospatial information science is a discipline that focuses on using geospatial information technology to understand people, places, nature and processes of the earth. IoT refers to Internet of things, the combination of sensors, software and other technologies to connect and exchange data with other devices and systems over the Internet. The era of IoT brings us opportunities and challenges for geospatial information science. In the keynote, five characteristics and three scientific issues of geo-spatial information science in the era of IoT are summarised.
Even date: 6/9/2022
Speaker: Prof. Daren Li
Moderator: Prof. Christopher Chao (Hong Kong Polytechnic University)
Panel members: Prof. Qingyan Chen, Prof. Qinhao Chen (Hong Kong Polytechnic University)
Hosted by: PolyU Academy for Interdisciplinary Research
- Subjects:
- Land Surveying and Geo-Informatics
- Keywords:
- Internet of things Geospatial data Spatial data mining
- Resource Type:
- Video
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Video
A short video on speech disorder for the general public.
[發音障礙］你的孩子說話時會否發音不準導致口齒不清，令你難以理解他的意思？甚至嚴重到被朋友取笑而不敢多說？ 究竟什麼時候需要言語治療的介入呢？想了解多一點，不妨看看我們的短片。
- Subjects:
- Health Sciences and Communication
- Keywords:
- Speech therapy Speech disorders
- Resource Type:
- Video
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Video
The notion of expertise is integral to all forms of institutional and professional practice in many domains – in education, healthcare, social welfare, law, journalism, banking, information technology, marketing, translating and interpreting services etc. It is a concept addressed by scholars across many disciplines – cognitive science, sociology, anthropology, psychology, language/communication studies, among others. There are, however, enduring problems of definition, description and measurement of expertise. Some scholars draw attention to the ongoing ‘crisis in expertise’ and others pronounce the ‘death of expertise’ in contemporary society.
More humbly, I begin with a characterisation of professional expertise very broadly to include scientific, experiential, technological, organisational, legal, ethical and communicative knowledge. This then leads me to the notion of ‘distributed expertise’, which extends beyond the individual remit and the conventional lay-expert divide. For instance, in the healthcare domain, a significant development afforded by internet-based technology is the increased level of patients’ e-health literacy and, consequently, democratisation of expertise. This amounts not only to accessing health information digitally, but also the phenomenon of patients ‘doctoring’ themselves in ‘the now of its presence’, i.e., ‘expert patients’ becoming instrumental in self-diagnosis and even self-treatment.
Additionally, ‘distributed expertise’ is also constitutive of ‘expert systems’, e.g., diagnostic and interventionist technologies as well as decision aids mediated by algorithms and templates. This is what I refer to as the technologization of expertise. I suggest that there is overreliance on ‘expert systems’ by both experts and lay persons in everyday decision making. Access to and use of ‘expert systems’ in optimal ways inevitably necessitates a reconfiguration of the very conditions and consequences of professional expertise.
Event Date: 25/11/2022
Speaker: Prof. Srikant Sarangi (Hong Kong Polytechnic University)
Hosted by: Faculty of Humanities
- Keywords:
- Information technology -- Social aspects Democratization Expertise
- Resource Type:
- Video