Scenario description: assume you got a new wireless sensor device with circuit power consumption of p_elec = 0.015mw. frequency bandwidth (i. e. symbol rate) is 1mhz. you have a packet with 125 bytes to send. assume there is no other overhead, and you can ideally turn on and off the transmission without additional power cost. now you can choose using various data rates to transmit this packet, while maintaining the same ber at 0.0001 with the following assumption: using bpsk, the required tx amplifier power consumption of p_t =0.02mw; using qpsk, the required tx amplifier power consumption of p_t =0.05mw. receiver energy consumption is not a concern. questions: calculate the energy consumption (in unit of nj – nano-joule) of transmitting this packet, using bpsk and qpsk schemes, respectively. do you prefer slow bpsk transmission to save power, or to transmit quickly with qpsk and then sleep?

Which of the following methods could be considered a “best practice” in terms of informing respondents how their answers to an on-line survey about personal information will be protected? respondents are informed that investigators will try to keep their participation confidential; however, confidentiality cannot be assured. respondents are informed that a research assistant will transfer all the research data to a password-protected computer that is not connected to the internet, via a usb flashdrive. the computer is located in a research team member’s office. the investigator uses the informed consent process to explain her institution’s method for guaranteeing absolute confidentiality of research data. the investigator uses the informed consent process to explain how respondent data will be transmitted from the website to his encrypted database without ever recording respondents’ ip addresses, but explains that on the internet confidentiality cannot be absolutely guaranteed.

Creating "smart interfaces" in all sectors of industry, government, and the public arena is one of the fastest growing hct areas. these interfaces model, interpret, and analyze such human characteristics as speech, gesture, and vision. the field of biometrics, in which humans authenticate themselves to machines, is an area of considerable interest to hct practitioners. fingerprint scans are one of the most frequently used biometric options, and this article, biometric student identification: practical solutions for accountability & security in schools, makes a case for the implementation of fingerprint scans in schools. critique the article, and answer the following questions: according to the author, what are the main benefits of adopting fingerprint scans in schools for student identification? according to the author, what are the main drawbacks of adopting fingerprint scans in schools for student identification? do you agree with the author's assessment of the pl

Experimental data that is expressed using numbers is said to be