O1. Lim, S.F.W.T., Sadaati, A., Rabbani, M. and Farrokh-Asl, H. 2020. Using life cycle assessment, decision making, and optimization techniques to design a sustainable waste management system (under review).
O2. Panjehfouladgaran, H. and Lim, S.F.W.T. 2020. Reverse Logistics Risk Management: Identification, Clustering, and Risk Mitigation Strategies. Management Decision, forthcoming.
O3. Manavizadeh, N., Farrokhi-Asl, H. and Lim, S.F.W.T. 2020. A new mathematical model for the green vehicle routing problem by considering a bi-fuel mixed vehicle fleet. Journal of Optimization in Industrial Engineering, forthcoming.
O4. Rabbani, M., Saravi, N.A., Farrokhi-Asl, H., Lim, S.F.W.T. and Tahaei, Z. 2018. Developing a sustainable supply chain optimization model for switchgrass-based bioenergy production: A case study. Journal of Cleaner Production, Volume 200, Issue 1, 827-843 .
O5. Park, H., Lim, S.F.W.T., Kim, J. I. and Lee, J.S.2016. Investigating the similarities and differences in usage between 3G and 4G smartphones. Advanced Science Letters, Volume 22, Issue 10, 2987-2991.
O6. Lim, W.T. and Ho, K.M. 2013. U.S. rebalancing strategy and its implication to MINDEF/SAF. Journal of the Singapore Armed Forces, Volume 39, Issue 4 ( Commendation award at 2012/13 Chief of Defence Force Essay Competition ).
O7. Lim, W.T. 2011. Discourse on Army recruitment in the context of generation Y. Journal of the Singapore Armed Forces, Volume 36, Issue 3 ( Merit award at 2010 Chief of Army Essay Competition 2010 ).
O8. Lim, W.T. 2008. Next generation of directional sound beam with bass enhancement. Department of Electrical and Electronic Engineering, Nanyang Technological University, Singapore (Distinction award ).
Peer-reviewed conference proceedings
O9. Lim, S.F.W.T., Zhang, A.N., Goh, M., Ong, Y.S. and Tan, P.S. “Three-dimensional vehicle routing problem for urban last mile logistics: Problem formulation and computational analysis“, Proc. U.K. Sim-AMSS 18th International Conference on Computer Modelling and Simulation, Cambridge, England, April 2016.
O10. Lim, W.T., Singh, H., Sinanović, S. and Haas, H. “An enhanced solutioning design for tactical military voice communication systems”, Proc. IEEE Conference on Industrial Electronics and Applications, Singapore, July 2012.
O11. Lim, W.T.”A speech enhancement technique for SAF Army communication systems”, Proc. Defence, Science & Research Conference,Singapore, August 2011.
O12. Oo, N., Gan, W.S. and Lim, W.T.”Generalized harmonic analysis of Arc-Tangent Square Root (ATSR) nonlinear device for virtual bass system”, Proc. IEEE International Conference on Acoustic, Speech and Signal Processing (ICASSP’10), Texas, USA, March 2010.
O13. Lim, W.T., Oo, N. and Gan, W.S.“A novel method of harmonic synthesis for virtual bass system”,Proc. IEEE International Digital Signal Processing Creative Design Exhibition, Tainan, Taiwan, Dec 2009( Excellence award at International Digital Signal processing Creative Design Exhibition 2008 ).
O14. Lim, W.T., Oo, N. and Gan, W.S . “Polynomial nonlinear device synthesis and harmonic shifting technique applied in virtual bass system”, Proc. IEEE International Symposium on Circuits and Systems (ISCAS’09), Taipei, Taiwan, May 2009.
Academic Papers and Reports
- Nanyang Polytechnic Alumni
- Footprint Issue 1, 2010, pp. 3
- EEE Excellence Award See List of 2009 Winners
- 32nd Tri-Service Warfighter Course Awarded Distinguished Graduate
Commercial Grade Implementation of NTU DSP Lab’s Virtual Bass Technology for Use in Philips TVs
The objective of this NTU-Philips collaboration project was to develop a commercial grade implementation of NTU DSP Lab’s Virtual Bass technology for use in Philips TVs. The real-time fixed-point digital signal processor TI C5509A was used to implement the algorithms. The frequency responses of the loudspeakers were measured to tune the algorithms and subjective listening experiments with 50 listeners were carried out to assess the audio quality as well as bass intensity. At the project closure, the know-hows were transferred to Philips staff.
Three-Dimensional (3-D) Vehicle Routing Problem for Urban Last-Mile Logistics
Last-mile logistics (LML) has been regarded as the most expensive and least efficient segment in a supply chain and is subject to the most pressing environmental concerns. This project presents a case study on urban LML in Singapore to highlight the key characteristics of close-proximity high-rise buildings. Additionally, this study proposes two novel vehicle routing problem models (3-DVRP and 3-DGVRP) for urban LML by extending the traditional VRP formulation from a two-dimensional to a three-dimensional plane to emphasize the importance of vertical travel distances in high-rise urban environments. Although often encountered in practice, the incorporation of both service time and vertical travel distance has not been previously modeled in the literature. Simulations and computational experiments were conducted to demonstrate the feasibility of the proposed 3-DVRP and 3-DGVRP for ULML.
Development of Fibre Bragg Grating (FBG) Based Multiplexer/Demultiplexer
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