Ching-Chiuan Yen
Email Address
didyc@nus.edu.sg
Organizational Units
COLLEGE OF DESIGN & ENG
faculty
DESIGN & ENVIRONMENT
faculty
23 results
Publication Search Results
Now showing 1 - 10 of 23
Publication Controlling the hierarchical microstructure of bioceramic scaffolds by 3D printing of emulsion inks(ELSEVIER, 2023-01-05) Liu, Quyang; Li, Tian; Gan, Soo Wah; Chang, Soon Yee; Yen, Ching Chiuan; Zhai, Wei; Dr Wei Zhai; DIVISION OF INDUSTRIAL DESIGN; MECHANICAL ENGINEERINGMechanical and biological properties constitute the most fundamental requirements for bone tissue engineering (BTE) scaffolds. Nonetheless, existing fabrication strategies find it difficult to prepare highly porous BTE scaffolds for improved biological properties while also preserving sufficient mechanical properties that are compatible with the natural bone. Inspired by the hierarchical porous materials in Nature, hierarchical porous BTE scaffolds can achieve a combination of superior mechanical efficiency and biological functions. With this in mind, this study reports the fabrication of hierarchical porous hydroxyapatite (hpHA) scaffolds by 3D printing of emulsion inks. The scaffolds exhibit high porosity up to 73.7%, featuring 3D printed macropores of 300 – 400 µm and emulsion templated microporosity of < 20 µm. Via formulation of the emulsion inks, such as varying the oil volume and adding Pluronic® F-127, this process demonstrates effective control of the microporosity and pore morphology of the scaffolds. The scaffolds are mechanically compatible with the natural cancellous bone, with compressive strength in the range of 1.41 – 7.84 MPa and Young's modulus of 57.3 – 304 MPa. Furthermore, the elastic admissible strain (EAS) and specific energy absorption (SEA) of the hpHA scaffolds can be increased up to 4.4% and 1.22 kJ/kg, respectively, indicating greatly enhanced mechanical performances owing to the hierarchical porous structure. Meanwhile, improved cell attachment, spreading and proliferation are observed in these scaffolds with their additional microporosity. Hence, the hpHA scaffolds in this study show great potential in BTE applications, and the reported process of 3D printing of emulsion inks is a promising fabrication strategy for further optimization of highly porous BTE scaffolds.Publication Virtual breast oncoplastic surgery simulator (VBOSS): A novel training tool in breast surgery(W.B. Saunders Ltd, 2018-11-01) LIM GEOK HOON; LEE JIEYING; YEN CHING-CHIUAN; Assoc Prof Yen Ching-Chiuan; DIVISION OF INDUSTRIAL DESIGN; SMART SYSTEMS INSTITUTE; DUKE-NUS MEDICAL SCHOOLThe Association for Cancer Surgery, and the European Society of Surgical Oncology Virtual simulators have been employed for the teaching of breast surgery. However, there remains no virtual simulator for the training of oncoplastic breast conserving surgery. This is the first known report of virtual simulator for oncoplastic breast conserving surgery training, to the best of our knowledge.Publication The Effects of a Functional Three-dimensional (3D) Printed Knee Joint Simulator in Improving Anatomical Spatial Knowledge(John Wiley and Sons Inc., 2019-11-01) CAI BOHONG; RAJENDRAN,KANAGASUNTHERAM; BAY BOON HUAT; LEE JIEYING; YEN CHING-CHIUAN; Assoc Prof Yen Ching-Chiuan; DIVISION OF INDUSTRIAL DESIGN; ANATOMY; SMART SYSTEMS INSTITUTEIn recent decades, three-dimensional (3D) printing as an emerging technology, has been utilized for imparting human anatomy knowledge. However, most 3D printed models are rigid anatomical replicas that are unable to represent dynamic spatial relationships between different anatomical structures. In this study, the data obtained from a computed tomography (CT) scan of a normal knee joint were used to design and fabricate a functional knee joint simulator for anatomical education. Utility of the 3D printed simulator was evaluated in comparison with traditional didactic learning in first-year medical students (n = 35), so as to understand how the functional 3D simulator could assist in their learning of human anatomy. The outcome measure was a quiz comprising 11 multiple choice questions based on locking and unlocking of the knee joint. Students in the simulation group (mean score = 85.03%, ±SD 10.13%) performed significantly better than those in the didactic learning group, P < 0.05 (mean score = 70.71%, ±SD 15.13%), which was substantiated by large effect size, as shown by a Cohen’s d value of 1.14. In terms of learning outcome, female students who used 3D printed simulators as learning aids achieved greater improvement in their quiz scores as compared to male students in the same group. However, after correcting for the modality of instruction, the sex of the students did not have a significant influence on the learning outcome. This randomized study has demonstrated that the 3D printed simulator is beneficial for anatomical education and can help in enriching students’ learning experience.Publication A demonstration of season traveller: Multisensory narration for enhancing the virtual reality experience(Association for Computing Machinery, 2018-04-20) Ranasinghe, N; Jain, P; Tram, NTN; Tolley, D; Liangkun, Y; Tung, CEW; Yen, CC; Do, EYL; Koh, KCR; Shamaiah, K; Mr Pravar Jain; DIVISION OF INDUSTRIAL DESIGN; INTERACTIVE & DIGITAL MEDIA INSTITUTE; SMART SYSTEMS INSTITUTECopyright is held by the author/owner(s). This demonstration presents Season Traveller, a multisensory virtual reality (VR) narration of a journey through four seasons within a mystical realm. By adding olfactory and haptic (thermal and wind) stimuli, we extend traditional audio-visual VR technologies to achieve enhanced sensory engagement within interactive experiences. Using subjective measures of presence, we evaluated the impact of different modalities on the virtual experience. Our results indicate that 1) the addition of any singular modality improves sense of presence with respect to traditional audio-visual experiences and 2) providing a combination of these modalities produces a further significant enhancement over the aforementioned improvements.Publication Developing a Tangible Gaming Board for Post-Stroke Upper Limb Functional Training(Association for Computing Machinery, Inc, 2017-01-01) Wang, Pan; KOH CHOON HUAT,GERALD; CHRISTIAN GILLES BOUCHARENC; Xu, Tian Ma; Hamasaki; YEN CHING-CHIUAN; Assoc Prof Yen Ching-Chiuan; DIVISION OF INDUSTRIAL DESIGN; SCHOOL OF PUBLIC HEALTHLow patient motivation and compliance has been reported as a main barrier to effective rehabilitation. This study aims to provide an engaging and intuitive tool to increase the motivation of elderly stroke survivors in rehabilitation program. We present a tangible gaming board for the training of upper limb gross motor and fine motor skills. 64 RGB LED rotary encoders are evenly distributed on the board into eight rows. A modular design allows for training of various hand functions with interchangeable sizes of knobs attached on the rotary encoders. Preliminary usability testing of the game "Lights Invader" with eight elderly stroke survivors suggested that the gaming board has a high acceptance rate among all the participants, the game interface is easy to understand and the game is fun to play with. User feedback on the features that need to be improved are discussed in this paper.Publication Designing two-player competitive games for the rehabilitation of upper-limb motor function after stroke(Association for Computing Machinery, 2017-05-06) Wang, P; KOH CHOON HUAT,GERALD; Christian Gilles Boucharenc; YEN CHING-CHIUAN; Assoc Prof Yen Ching-Chiuan; DIVISION OF INDUSTRIAL DESIGN; SAW SWEE HOCK SCHOOL OF PUBLIC HEALTHThis paper outlines the design and preliminary user testing of a two-player competitive game system for the training of post-stroke upper limb motor functions. The system consists of two tangible gaming boards (with 64 RGB rotary encoders on each) that support the training of shoulder reaching functions and fine motor skills. Two games were developed and tested on ten stroke survivors. System usability and player motivation were measured by questionnaire. The preliminary results indicated the system is easy to use. Participants perceived a high level of enjoyment with the game. The challenges, design strategies and future directions are also discussed.Publication Mapping Design Capability of Governments: A Tool for Government Employees’ Collective Reflection(National Taiwan University of Science and Technology, 2023-04-30) Yeo, Yvonne; Lee, Jung Joo; Yen, Ching Chiuan; Dr Jung Joo Lee; DIVISION OF INDUSTRIAL DESIGNWith the increasing phenomenon of governments adopting design approaches, their one-size-fits-all kind of training or blind adoption without the understanding of their current capability has reported various limitations. This study introduces an instrument entitled the Design Capability Mapping Tool (DCMT), aimed at engaging government employees to identify their current practices and awareness of design, and organizational conditions for the design capability development. The Design Capability Mapping framework and tool were developed through an extensive literature review and a pilot study. Then it was applied in three government organizations in Singapore. The mapping findings identified each organization’s status encompassing multiple aspects of design capability and organization-specific challenges. The strength of the DCMT was to enable employees’ collective reflection, instead of management’s assessment, and provide a holistic and practical assessment tool that could inform future strategies for sustained design capability development.Publication Building confidence and competency in the delivery of local regional anaesthesia by undergraduate dental students with 3D printed anatomy models and augmented reality technology(2019-12-01) Foong, Weng Chiong Kelvin; Yen, Ching Chiuan; Lee, Jieying; Tong, Huei Jinn; Voon, Chee Tet Francis; Tok, Wee Wah; Islam, Intekhab; Assoc Prof Weng Chiong Kelvin Foong; NUS INFORMATION TECHNOLOGY; DIVISION OF INDUSTRIAL DESIGN; DEAN'S OFFICE (DENTISTRY); ANATOMY; SMART SYSTEMS INSTITUTEPublication Machine Learning-Guided Prediction of Central Anterior Chamber Depth Using Slit Lamp Images from a Portable Smartphone Device(MDPI, 2021-06-01) Chen, David; Ho, Yvonne; Sasa, Yuki; Lee, Jieying; Yen, Ching Chiuan; Tan, Clement; Assoc Prof Woon Teck Clement Tan; DIVISION OF INDUSTRIAL DESIGN; SMART SYSTEMS INSTITUTE; OPHTHALMOLOGYThere is currently no objective portable screening modality for narrow angles in the community. In this prospective, single-centre image validation study, we used machine learning on slit lamp images taken with a portable smartphone device (MIDAS) to predict the central anterior chamber depth (ACD) of phakic patients with undilated pupils. Patients 60 years or older with no history of laser or intraocular surgery were recruited. Slit lamp images were taken with MIDAS, followed by anterior segment optical coherence tomography (ASOCT; Casia SS-1000, Tomey, Nagoya, Japan). After manual annotation of the anatomical landmarks of the slit lamp photos, machine learning was applied after image processing and feature extraction to predict the ACD. These values were then compared with those acquired from the ASOCT. Sixty-six eyes (right = 39, 59.1%) were included for analysis. The predicted ACD values formed a strong positive correlation with the measured ACD values from ASOCT (R2 = 0.91 for training data and R2 = 0.73 for test data). This study suggests the possibility of estimating central ACD using slit lamp images taken from portable devices.Publication Season Traveller: Multisensory Narration for Enhancing the Virtual Reality Experience(Association for Computing Machinery, 2018-01-01) Ranasinghe, Nimesha; Jain, Pravar; Nguyen, Thi Ngoc Tram; Koh, Koon Chuan Raymond; Tolley, David; Karwita, Shienny; Lin, Lien-Ya; Yan, Liangkun; Shamaiah, Kala; Tung, Chow Eason Wai; Yen, Ching Chiuan; Do, Ellen Yi-Luen; Mr Pravar Jain; INTERACTIVE & DIGITAL MEDIA INSTITUTE; SMART SYSTEMS INSTITUTE; ELECTRICAL AND COMPUTER ENGINEERING© 2018 ACM. In the same way that we experience the real-world through a range of senses, experiencing a virtual environment through multiple sensory modalities may augment both our presence within a scenario and our reaction to it. In this paper, we present Season Traveller, a multisensory virtual reality (VR) narration of a journey through four seasons within a mystical realm. By adding olfactory and haptic (thermal and wind) stimuli, we extend traditional audio-visual VR technologies to achieve enhanced sensory engagement within interactive experiences. Using both subjective measures of presence and elicited physiological responses, we evaluated the impact of different modalities on the virtual experience. Our results indicate that 1) the addition of any singular modality improves sense of presence with respect to traditional audio-visual experiences and 2) providing a combination of these modalities produces a further significant enhancement over the aforementioned improvements. Furthermore, insights into participants' psychophysiology were extrapolated from electrodermal activity (EDA) and heart rate (HR) measurements during each of the VR experiences.
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