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Here we have shown a new variation of the microfabricated pillar array detector (MPAD) that can decouple the stiffness gradient from the focal adhesion area of a cell. This goal is achieved through the use of “stepped” micro pillar array device (SMPAD) whose top contact area with a cell is kept constant while the diameter of pillar bodies vary for variable mechanical stiffness. We have observed manipulating...
This paper reports an up to 95.9% angle detection accuracy enhancement for capacitive tactile sensors, which entails asymmetric and intentionally shifted electrodes. The rotational shift between two electrodes of a capacitor that greatly contributed to angle detection errors was theoretically analyzed and examined by experiments with simulations. The asymmetric electrodes containing one fan- and one...
We report a new design concept of micromechanical cantilever system incorporating the 1∶3 internal resonance during dynamic mode operation of atomic force microscopy (AFM). The passive amplification of third harmonic triggered through the mechanism of 1∶3 internal resonance enables AFM to utilize multiple harmonics in an air environment. Detailed theoretical and experimental studies of the proposed...
This paper reports an on-chip analytical method for studying physical mechanisms of plant root growth in soil environments. To quantitatively evaluate physical interaction between root and soil, we developed a silicon-based microchannel device integrated with force displacement sensor which mimics a barrier in soil. By using developed microsystem, we successfully characterized the driving forces of...
A portable and lightweight vibrotactile biofeedback system is introduced here which acts as a real-time balance aid. The biofeedback system provided users with vibrotactile stimulation based on changes in plantar pressure distribution. An experiment was conducted to investigate its effectiveness in improvement of postural control. A Romberg test was performed requesting the subjects to stand as still...
Particle manipulation has attracted the attention of many researchers around the globe for various biomedical applications. Although several methods have been utilized to sort particles on lab-on-a-chip platforms, dielectrophoresis (DEP) possess exclusive advantages over other methods. In this paper, we investigated microarray dot electrodes to manipulate microparticles. The geometry of the dot electrode...
Contests and their benchmarks have become an important driving force to push our EDA domain forward in different areas lately, such as ISPD, TAU, DAC contests. The annual CAD Contest in Taiwan has been held for 14 consecutive years and has successfully boosted the EDA research momentum in Taiwan. To encourage better research development on timely and practical EDA problems across all domains, CAD...
In this paper, we describe the development of a leg with a rotational joint that mimics the elastic characteristics of the leg of a running human. The purpose of this development was to realize the dynamics of human running, the analysis of which has revealed that the motion of the leg can be modeled by a compression spring and that of the leg joint by a torsion spring. We, therefore, assumed that...
Humanoid robots are required to improve its walking ability (stability and efficiency) in order to adapt to various environments. Extension of the embodiment by a cane is effective as well as human like elderly. In this paper, we propose a scheme that enables the robot to perform cane-supported walking and select the optimal cane usage based on its condition so as to maximize the performance of cane...
This paper presents a cable-driven ankle rehabilitation system (C-DARS). The proposed system is designed to easily apply the ankle rehabilitation treatment for multi-users. A small and light connecting part is attached to an orthosis worn by a patient, and the required force for the rehabilitation treatment is transmitted by a cable-driven mechanism. The force-delivering part can be easily attached...
In order to gain some insights for post CMP cleaning, we measured the forces during brush scrubbing. In this experiment, both the normal force Fn and shear (friction) force Fs generated by a single sponge sliding on the plate were measured. The Fn of PVA increased quickly and attained its maximum value. After that, Fn gradually decreased to a constant value even in the same compression distance. Fs...
Recent studies reveal significant reduction of postural stability in transtibial amputees (TAs) especially when a perturbation is applied. However, no record has been seen on the consequences of such perturbation on the stump-socket interface pressure (SSIP). Our objective was to investigate whether such perturbation impose excessive pressures on the stump. We were also interested on the type of the...
China has implemented curricular reforms with a focus on inquiry learning in physics education. As has been the case in other countries around the world, teachers have generally supported the intentions of the curriculum in relation to inquiry pedagogy but, in the face of high stakes assessment and other issues, have struggled to implement it appropriately in classroom teaching. Interactive simulations...
This paper describes in brief overview the development of the Electrostatics Processes Committee from its origins within the AIEE to its current position as part of the IAS Annual Meetings. Its expansion of subject matter is highlighted and the development of recent international collaborations with other societies is discussed.
This study examined the fingertip force variability on the left and right hand during low-level sustained precision pinch with the thumb and index finger. Ten healthy, right-handed subjects were required to pinch a device with a stable force output at 5 N for 1 min. The pinch force was recorded for the right and left hand, separately. Visual feedback was provided for the first 30 s and removed for...
High myopia esotropia is a kind of special strabismus whose pathology is still uncertain. In this paper, the finite element analysis method is applied to examine some physiological hypotheses by modeling the movement of the eyeball and morbid extraocular muscles. The model stems from clinical data. Theoretical analyses are also performed to examine the effect of oblique pulley. Finally, postoperative...
Looking for the improvement of the students' learning, the engineering school of EAFIT University is currently developing an evaluation and training system. In this system, each student has the option of doing "dynamic" exercises in a specific field of a subject. Whenever a student uses the system, an exercise is generated with different parameters and values. The mentioned system (Evaluation...
Inquiry-based learning activities (IBLAs) consist of presenting teams of students with a physical situation and asking them to predict what will happen. The students collaboratively experiment with physical hardware that becomes the "authority", thus forcing students to confront any misconceptions. Several variations of the activity are presented, requiring students to examine and reformulate...
Introductory engineering problems set foundational knowledge required by students. While statics is a course that is typically offered during the start of an engineering student's sophomore year, it is one of the first pre-professional engineering courses students are exposed to and is important to their persistence in engineering. An understanding of the strategies and misconceptions that students...
Wave propagation in chain-like materials has been studied previously at low frequencies. The present study has generated these waves at higher frequencies with components >200 kHz, using chains of 1 mm diameter spheres. Resonant ultrasonic horns at 73 kHz have been used as sources of narrowband excitation, which transform into a train of broadband impulses that have the characteristics of solitary...
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