Research Publications Authored by SLIIT Staff

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This collection includes all SLIIT staff publications presented at external conferences and published in external journals. The materials are organized by faculty to facilitate easy retrieval.

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Subject: search.filters.subject.Sensors

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Now showing 1 - 4 of 4
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    PublicationOpen Access
    Sustainable Farming in Soilless Culture Non-Circulating Kratky Method Using Fuzzy Logic Control and Measure Greenness
    (2022-01) WANNIACHCHI, L. R; JAYAKODY, A
    Organic horticulture and organic commodities have to face severe rivalry in today's economic environment. Even though there are several forms of home gardening, there is a need for a more organized and structured need has arisen. In horticultural, plants are planted on the water as a substitute for soil, it is feasible to achieve great efficiency although might be more suitable. Feeding the seedlings with the appropriate nutrients and hormones, as well as oxygen, is critical to the plant's vitality. The plant requires these chemicals and supplying them to the roots of plants would guarantee that the plant obtains the nutrients and oxygen it requires on a constant schedule. The system's strength is to give the plant the necessary oxygenation through the Air Roots of the seedlings being planted. The plant needs oxygen as well as nutrients from these root fibers as it grows over time, the amount of fiber required to extract oxygen will rise. The intensity of chlorophyll on the leaves can be determined by evaluating the quality of the plant and its nature. A more robust process is required considering urban expansion and human involvement is limited. To overcome these situations systems used to employ the latest IoT and microcontroller technologies. This study to control ecosystems introduce fuzzy logic controls and use a computer vision-based approach to computing plant greenness.
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    PublicationOpen Access
    Remote patient monitoring: a comprehensive study
    (Springer Berlin Heidelberg, 2019-01-29) Malasinghe, L. P; Ramzan, M; Dahal, K
    Healthcare is a field that is rapidly developing in technology and services. A recent development in this area is remote monitoring of patients which has many advantages in a fast aging world population with increasing health complications. With relatively simple applications to monitor patients inside hospital rooms, the technology has developed to the extent that the patient can be allowed normal daily activities at home while still being monitored with the use of modern communication and sensor technologies. Sensors for monitoring essential vital signs such as electrocardiogram reading, heart rate, respiration rate, blood pressure, temperature, blood glucose levels and neural system activity are available today. Range of remote healthcare varies from monitoring chronically ill patients, elders, premature children to victims of accidents. These new technologies can monitor patients based on the illness or based on the situation. The technology varies from sensors attached to body to ambient sensors attached to the environment and new breakthroughs show contactless monitoring which requires only the patient to be present within a few meters from the sensor. Fall detection systems and applications to monitor chronical ill patients have already become familiar to many. This study provides a review of the recent advances in remote healthcare and monitoring in both with-contact and contactless methods. With the review, the authors discuss some issues available in most systems. The paper also includes some directions for future research.
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    PublicationOpen Access
    PORTABLE SENSOR ATTACHMENT
    (SAITM Research Symposium, 2013) Chandrasiri, L. H. R. P; Abhayasinghe, N
    The rapid development of technology is placing an enormous demand for smart phones and similar devices as we are requiring more and more from these mobile devices. One of the major products which are becoming increasingly popular is the mobile phone. There are many sensors that may be used in such applications and some of which are: the accelerometer, digital compass, gyroscope, temperature, camera, etc. These sensors help enable new applications such as guiding systems, social network, health, gaming, entertainment, education, transportation, and many more. This paper presents the design, development and implementation of a portable sensor attachment that includes several sensors. The device includes sensors such as accelerometer, gyroscope, light level, atmospheric pressure, temperature and compass that may be used for human gait analysis, indoor/outdoor localization and navigation. This device can be coupled with any Bluetooth enable host device and data will be transferred to the host for further processing.
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    PublicationEmbargo
    Optimal placement of actuators and sensors for floor vibration control
    (American Society of Civil Engineers, 2000-12) Hanagan, L. M; Kulasekere, E. C; Walgama, K. S; Premaratne, K
    Lightweight floor systems are susceptible to excessive levels of vibration caused by occupant activities such as walking, dancing, and aerobics. Ongoing research utilizes active control to reduce vibration. Placement of multiple actuators and sensors for effective vibration control of flexible systems such as floors is a challenging task. The method proposed in this paper simultaneously determines optimal placements for multiple actuators, sensors, and appropriate output feedback gains of the controller. Instead of carrying out the controller design in the analog domain and then applying a transformation to arrive at a digital implementation, the proposed algorithm provides a digital controller directly. This allows lower sampling rates to be used at the implementation stage. To obtain faster settling times in the presence of external disturbances, a performance index that penalizes system states exponentially is utilized. The nonlinearities associated with actuator saturation due to force/stroke limitations is considered explicitly in the optimization. The proposed algorithm uses an interpolation scheme in case only partial knowledge of the mode shape is available. Hence it is applicable to a wider class of 2D structures that do not possess closed-form expressions for modal shapes and for which one has to resort to finite-element or experimental modal analysis.