The oHealth system architecture as shown in Fig. 1 has five main actors. The first actor is senior citizens with hypertension who can use oHealth by connecting with Wi-Fi or a mobile Internet data in Android device. The second actor is the administrator who maintains the database on Azure SQL Database cloud server. The third actor is doctor, assistant, and family members who receive history data and blood pressure analysis report of senior citizens. The fourth actor is BP5 device which can measure blood pressure. The last actor is azure machine learning which gets all the collected data and analyze hypertension levels for the user. The oHealth application requires the user to register as a member by providing their personal information and log-in. The application offers six main features. The first feature is user profile, which keeps senior’s information. The second feature is measure blood pressure, which measures blood pressure by connecting blood pressure device. The third feature is knowledge, which gives knowledge about hypertension, food, exercise, and medicine. The fourth feature is treatment, which records food dairy, medicine intake, and exercise for using in hypertension analysis and treatment. The fifth feature is reminder, which uses to set reminder to measure blood pressure and take medicines in each day. The last feature is analysis, which analyzes hypertension levels with azure machine learning system by using Multiclass Logistic Regression algorithm [20] to create a predictive model and shows the result to the user. The analysis results and history data can be shared to doctors, assistant, or family members. IV.USER INTERFACEUser interface design of oHealth is based on senior citizens support in mind, according to the principles of a good system design [17]. oHealth design concepts consist of 4 principles, which are use minimalist design to prevent cognitive overload, provide large icons that are easy to interpret and interaction, avoid the use of irrelevant information on the screen, provide maximize contrast and avoid use of bright colors.
The purpose of evaluation is to measure the user satisfaction toward oHealth. The details of the evaluation method are described into three steps. Firstly, introduce and provide essential information to users to comprehend the concepts of oHealth. Secondly, demonstrate the application to them step-by-step. Finally, let the users test the application and ask them to answer aquestionnaire. The questionnaire consists of questions asking about their personal information and key aspects of the application including easy to use and understand, attractiveness and interest, user interface and design, benefits and advantages, adapt to use in daily life. 25 participants in the age of 60 to 70 years were volunteers to use oHealth. Number of male participants (36%) are less than female (64%). They reply questions concerning to the usage of oHealth as shown in Fig. 14. 23participants (or 92%) thought that oHealth is easy to use and not complicate. 21 participants (or 84%) agreed that oHealth is easy to use in daily life especially the measurement because it is always available, so users can use any time and 21 participants (or 84%) judged that oHealth has a simple design and suitable for users. CodeShoppy
Our research project intends to introduce the concept of self-care for senior citizens with hypertension by developing an android application that users can prevent, evaluate and treat hypertension. oHealth let users know their blood pressure, exercise hour and sodium intake in each day, medicine intake, hypertension levels and learned to aware or adopt the healthy life style. oHealth could support users to treat hypertension in an appropriate way and measure blood pressureanywhere and anytime especially at home to get the accurately outcome. Moreover, it can give more knowledge about hypertension to users. In thefuture work, to be more useful, oHealth should be extended to connect to other medical devices such as heart rate monitor, glucose monitor, weighing scale and pedometer.
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