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Browsing by Author "Koo, Dan D."
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Item Building a Private LoRaWAN Platform(BEIESP, 2019) Lee, John J.; Souryal, Youssef; Tam, Darren; Kim, Dongsoo; Kang, Kyubyung; Koo, Dan D.; Electrical and Computer Engineering, School of Engineering and TechnologyLoRaWAN technology has been here for several years as one of LPWAN technologies. It consists of various components such as end nodes, a gateway, a network server, and an application server at the minimum. The servers have been exclusive products of commercial companies, and not many experimental or academic ones are available. Recently one such software has been developed. However, few fully functional academic ones have been reported. In this study, we implement a fully functional private independent LoRaWAN platform for the academic research of LPWAN Internet of Things (IoT) and demonstrate that our platform can support not only end-to-end LoRaWAN communication but also graphical user interface on an embedded and limited computing power system.Item Fuzzy Controller Algorithm for Automated HVAC Control(IAARC, 2020-10) Chae, Myungjin; Kang, Kyubyung; Koo, Dan D.; Oh, Sukjoon; Chun, Jae Youl; Engineering Technology, School of Engineering and TechnologyThis research presents the design framework of the artificial intelligent algorithm for an automated building management system. The AI system uses wireless sensor data or IoT (Internet of Things) and user's feedback together. The wireless sensors collect data such as temperature (indoor and outdoor), humidity, light, user occupancy of the facility, and Volatile Organic Compounds (VOC) which is known as the source of the Sick Building Syndrome (SBS) or New Building Syndrome because VOC are often found in new buildings or old buildings with new interior improvement and they can be controlled and reduced by appropriate ventilation efforts. The collected data using wireless sensors are post-processed to be used in the neural network, which is trained in accordance with the collected data pattern. When the users of the facility have the control of the building's ventilation system and the AI system is fully trained using the user input, it will mimic the user's pattern and control the building system automatically just as the user wants. In this research, data were collected from 4 different buildings: university library, university cafeteria, a local coffee shop, and a residential house. Fuzzy logic controller is also developed for better performance of the HVAC. Indoor air quality, temperature (indoor and outdoor), HVAC fan speed and heater power are used for fuzzified output. As a result, the framework and simulation model for the energy efficient AI controller has been developed using fuzzy logic controller and the neural network-based energy usage prediction model.Item An Internet-of-Things (IoT) system development and implementation for bathroom safety enhancement(Elsevier, 2016) Koo, Dan D.; Lee, John J.; Sebastiani, Aleksei; Kim, Jonghoon; Department of Engineering Technology, School of Engineering and TechnologyStatistics show that a bathroom is one of the most hazardous places especially for older people. Older people typically have greater difficulties with mobility and balance, making them more vulnerable to fall and slip injuries in a bathroom and causing serious health issues related to short and long-term well-being. Various components in a bathroom including shower, tub, floor, and toilet have been re-designed, and independently upgraded their ergonomics and safety aspects; however, the number of bathroom injuries remains consistently high in general. Internet-of-Things (IoT) is a new concept applicable to almost everywhere and man-made objects. Wireless sensors detect abnormalities and send data through the network. A large amount of data can be collected from multiple IoT systems and it can be utilized for a big data analysis. The big data may reveal a hidden positive outcome beyond the initially intended purposes. A few commercial IoT applications such as wearable health monitoring and intelligent transportation systems are available. Nevertheless, An IoT application for a bathroom is not currently known. Unlike other applications, bathrooms have some unique aspects such as privacy and wet environment. This paper presents a holistic conceptual approach of an Internet-of-Things (IoT) system development and implementation to enhance bathroom safety. The concept focuses on the application in a large nursing care facility as a pilot testing bed. Authors propose 1) sensor selection and application, 2) integration of a wireless sensor local network system, 3) design concept for IoT implementation, and 4) a big data analysis system model in this paper.Item Sustainability evaluation of pipe asset management strategies(Elsevier, 2016) Matthews, John C.; Piratla, Kalyan; Koo, Dan D.; Department of Engineering Technology, School of Engineering and TechnologyThe consequences associated with pipe failures can be widespread impacting service, while potentially causing damage, affecting traffic, and contaminating water. Recently the visibility of pipe failures has increased with social media and 24-hour news coverage. In response, many utilities have adapted pipe asset management strategies to reduce failures. Also, many technologies have emerged that allow for a more proactive pipe asset management. As sustainability has become a focus for many organizations including utilities, the question becomes which pipe asset management strategy is most sustainable. The purpose of this paper is to evaluate three pipe asset management strategies for sustainability using Envision®. The strategies include: a reactive run-to-failure and then replace; a preemptive replacement prior to failure based on assumed condition; and a balanced approach of active condition assessment and action based on the known condition. Envision® will be used to evaluate each approach to determine its sustainability rating.Item Waste Water Force Main Pipe Construction Alternatives to Protect Existing Foundations in the City of Chandler: Case Study(Elsevier, 2016) Kim, Jonghoon; Baird, Andrew; Koo, Dan D.; Ariaratnam, Samuel T.; Chong, Wai K. O.; Department of Engineering Technology, School of Engineering and TechnologyTo provide additional wastewater capacity and redundancy in South Chandler, Arizona, a new 28” High Density Polyethylene (HDPE) force main was installed from the upsized Kyrene Lift Station three miles east to tie into an existing 66” transmission sewer line. The force main was installed under the State Route Loop 202 (SR 202L) freeway through existing 48” steel casings constructed ten years prior. Additionally, the force main was constructed through a narrow Arizona Department of Transportation (ADOT) corridor, which required clearance from existing utilities, including overhead 69 kV power poles. Two locations required innovative solutions to both access the existing sleeves and cross the transmission power pole foundations: 1) crossing of the 69 kV power pole required detailed slope stability analysis and location specific trench backfilling; and 2) access to the existing 48” was within 15 feet of an existing ADOT sound wall. Various alternatives for access were analyzed in this paper including temporary shoring, sheet pile installation, and full wall replacement and reconstructing on drilled shafts. Based on the objectives above, the existing power pole does not have sufficient embedment for maximum design loads but is stable with reduced load factors and lower operation wind forces. Also, for construction issue with the existing ADOT sound wall, the temporary shoring and sheet piles used due to the geotechnical conditions and construction costs.