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Recording of biopotential signals is uneasy as interference and noise can come from the preparation of the subject, environment setting and other biological signal. The circuit design in acquisition system must good and meets specification as is not distort original signal and safe to patient. Classic design of biosignal acquisition system usually use third electrode as reference potential. The third electrode is not picking up the biological signal and placed quite far from the measured signal as it can help to remove common mode signal. However, sometime the third electrode will limit patient movement since some of the experiment requires the patient or subject do several kind of movement during signals recording. Therefore, two electrodes system without third electrode may provide mobility and comfort since number of electrode patched on the body is reduced. Though several previous researches have implemented the two electrodes system, but they only tested on electrocardiogram. Hence, the main contribution of this paper is investigating the ability and performance of the proposed system on fetal electrocardiogram and electromyogram detection since the challenges to detect both signals are different compare to electrocardiogram. The electrocardiogram, fetal electrocardiogram and electromyogram are successfully detected using the propose system but with several filtering stages. The performance evaluation include signal to noise ratio after the filtering stage and accuracy of the signal detection.

Problem statement: Many published studies have found that more than 50% of Customer Relationship Management (CRM) system implementations have failed due to the failure of system usability and does not fulfilled user expectation. This study presented the issues that contributed to the failures of CRM system and proposed a prototype of CRM system developed using Human Computer Interaction approaches in order to resolve the identified issues. Approach: In order to capture the users' requirements, a single in-depth case study of a multinational company was chosen in this research, in which the background, current conditions and environmental interactions were observed, recorded and analyzed for stages of patterns in relation to internal and external influences. Some techniques of blended data gathering which are interviews, naturalistic observation and studying user documentation were employed and then the prototype of CRM system was developed which incorporated User-Centered Design (UCD) approach, Hierarchical Task Analysis (HTA), metaphor and identification of users' behaviors and characteristics. The implementation of these techniques, were then measured in terms of usability. Results: Based on the usability testing conducted, the results showed that most of the users agreed that the system is comfortable to work with by taking the quality attributes of learnability, memorizeablity, utility, sortability, font, visualization, user metaphor, information easy view and color as measurement parameters. Conclusions/Recommendations: By combining all these techniques, a comfort level for the users that leads to user satisfaction and higher usability degree can be achieved in a proposed CRM system. Thus, it is important that the companies should put usability quality attribute into a consideration before developing or procuring CRM system to ensure the implementation successfulness of the CRM system