No abstract

Social Commerce Sites has proliferated on the Mobile Web and Mobile App. However, because virtually anyone can publish this type of information on the Web, consumers cannot always rely on traditional credibility cues such as reputation of a journal. Instead, they must rely on a variety of cues, including visual presentation, to determine the veracity of information. This study demonstrates that users make a judgment of mobile sites' credibility not by contents but by user experiences. Most important factor of user experiences is the visual design and the next is information structure. Brand recognition is also one of user experiences, but users are not always depend on a brand recognition when choosing favorite sites.

MEMS switches based on a dual-mode actuation scheme that simultaneously allows for large standoff heights and low clamping voltages have been designed and fabricated. These devices are based on the use of a transient external magnetic field to bring the actuating portion of the switch close to a dielectric-coated clamping electrode, followed by application of an electrostatic clamping voltage to keep the switch closed. Since the clamping voltage is applied when the switch is closed, this voltage can be relatively small. This approach is particularly attractive for RF applications such as arrays of switches in reconfigurable aperture antennas. The arrays of switches are simultaneously closed by the magnetic field generated by an external magnetic source, then selected switches are clamped by electrostatic force using low voltages to maintain the ON state. Their utility in such an array has been demonstrated and several different design variations have been explored to improve switch performance. Contact resistance as low as 0.37 X has been achieved, with actuating field strength of 40 Gauss. These switches possess a large open state air gap (25 lm), and are able to pass high currents in excess of 1 A under low frequency or DC operation. The large OFF state impedance allows for their usage in switching applications in RF devices. Their high frequency functionality has been tested to find that their open-state impedance was identical to that of a perfect open up to 9 GHz and their RF reconfigurability has been demonstrated in a monopole/dipole test bed.

MEMS switches based on a dual actuation scheme that simultaneously allows for large standoff heights and low clamping voltages have been fabricated. The switches consist of a magnetically-driven component and an electrostatically-driven component. These devices are based on the use of a transient external magnetic field to bring the actuating portion of the switch (made of electroplated NiFe) close to a dielectric-coated clamping electrode, followed by application of an electrostatic clamping voltage to keep the switch closed. Since the clamping voltage is applied when the switch is closed, this voltage can be relatively small. This approach is particularly attractive for reconfigurable arrays of switches. Arrays of switches are simultaneously closed by the magnetic field generated by an off-substrate magnetic source. Selected switches are clamped by electrostatic force using low voltages to maintain the ON state. With this scheme, reconfigurable patterns on an array of switches are possible. These switches possess a large open state air gap (25–35 μm), and are able to pass high currents in excess of 1 A. The large OFF state impedance, then, allows for their usage in switching applications in reconfigurable aperture antennas.