Professor Dr Mohamed Ridza bin Wahiddin

Universiti Sains Islam Malaysia (USIM), Malaysia

  • DSc (Higher Doctoral Degree in Quantum Optics), UMIST, Mancheser, UK
  • PhD (Quantum Optics), UMIST, Manchester, UK
  • MSc (Quantum Optics), UMIST, Manchester, UK
  • Bsc. (Physics), UMIST, Manchester, UK

Dissipative dynamics of an atom beyond the rotating-wave approximation

We show that the inclusion of the counter-rotating terms to the interaction of a two-level atom with a thermal vacuum field results in fluorescence and absorption spectra which are qualitatively different to those that are obtained under the rotating-wave approximation. The effect of counter-rotating terms on the structure of the fluorescence and absorption spectra of a two-level atom is investigated. It is found that the inclusion of the counter-rotating terms in the interaction of the atom with the vacuum field can modify the spontaneous decay properties of the atom, and thereby gives rise to interesting new features in the spectra of the emitted field. An interpretation of the unusual features of the spectra is provided in terms of the transmission of a weak probe used to obtain quantitative information about the presence of two channels.


Assoc Prof Dr Kushsairy Abdul Kadir

Universiti Kuala Lumpur-BMI (UniKL-BMI), Malaysia

Rehabilitation Robot for Post-stroke Patient: Technology, Product, and Challenges

Ischemic intracranial vascular is a foremost source of stroke that may results incapable of movement in normal life. Paralysis and Spasticity are mainly common effect of stroke which brings the person towards the disability of limbs movement by injured the brain. Post-stroke patient can be diagnosed for the different problems with muscle weakness/rigidity, abnormal movement, lack of sensitivity, joint rigidness, and orientation abnormality.

Therefore, the purpose of rehabilitation robot is to recover the post-stroke patient from different types of disabilities. It results the patients to become independent in their daily life. Regular physical therapy and medical care are necessary for a post-stroke patient. A physical therapist is capable to perform this task which is costly for regular basis treatment for average people. Thus a new technology is required for post-stroke rehabilitation by providing regular therapy. According to scientific concern, the main efficient rehabilitation provider should have significant characteristics, i.e. perform specific task, multi-sensors equipped system, rigorous, and able to do precise therapy training. Accordingly rehabilitation robotic technology could be best match for post-stroke rehabilitation therapy.

There are two kinds of robotics devices are currently available in the market for upper and lower limb rehabilitation. Reinstate the functionality of lower and upper limb will be the main goal of such kind of robotics devices. Rehabilitation robotic device plays important roles on the restoration of normal gait of post-stroke patient. There are almost fifteen robotics devices are commercially available for lower limb rehabilitation. However upper limbs robotics devices are commonly available in the current market. However the available technology requires concurrent update. Therefore, In current decade, researchers are recurrently developing rehabilitation devices but still a lot of challenges need to be sort out. Challenges include traditional technology, heavy and rigid mechanical structure and human ergonomics and natural mechanism. Therefore an intensive research is required to develop lower and upper limb rehabilitation robot by considering all said issues.

In this research, we are trying to sort-out the current issues on the available technology, and rehabilitation robotic devices by doing an intensive research on current market. The result from this survey will help the researchers in their future development on rehabilitation robots.


Assoc Prof Robiah Ahmad, PhD

Department of Engineering and Technology
Universiti Teknologi Malaysia (UTM), Malaysia

Thermal and Electronics Cooling Applications using Engineering Design Optimization Methods

The unprecedented growth in electronics, communication, and computing technologies for the last few decades along with their devices through miniaturization and an enhanced rate of operation and storage of data has brought about problems in the thermal management of these devices. Many heat removal techniques have been previously used to perform the heat dissipation process based on the concept of microelectronic mechanical systems (MEMS). In the past, the performance of these systems was evaluated using experimental and theoretical approaches. Theoretical solutions provided exact answers but were rarely available for three-dimensional multi-mode heat transfer problems. Experimental approaches were used to establish a general understanding of the behaviour of a system but there they were difficult to measure as well as being expensive, particularly for parametric studies. Simulation and modelling is one of the tools that play a role in early product development stages which can help lower production cost, reduce time consumption, lower failure risk and more. Simulation with engineering optimization uses various optimization techniques to achieve design goals in different engineering applications. In this talk, the author will share some engineering design optimization approaches from different research
projects for thermal cooling applications such as microchannel heat sink, thermal acoustic refrigeration as well as a magnetic piezoelectric fan for electronic cooling.