Myeong-in Choi

Degradation diagnosis system of photovoltaic panels with mobile application

Recently, the number of buildings and houses in which photovoltaic (PV) systems are installed has increased. However, an issue with the efficiency of the PV system and the degradation phenomenon has been revealed. Consumers who benefit from the PV system experience difficulties monitoring and controlling it because a PV diagnosis system is heavy and expensive to install at home. Furthermore, the existing diagnosis system is not coordinated with a home energy management system. In addition, the accurate performance evaluation of the PV system is required for energy management. Therefore, a new degradation diagnosis system for PV panels for household consumers is proposed in this paper. Additionally, a mobile-type home gateway that has various management applications is proposed. It is demonstrated that, with this mobile-type home gateway applied to the proposed system, consumers can monitor the degradation of the PV system, analyze the efficiency of the PV panels, and save energy at home by using a mobile-type home gateway.

An IoT-based home energy management system over dynamic home area networks

A smart grid (SG) has attracted great attention due to recent environmental problems. SG technologies enable users, such as energy system operators and consumers, to reduce energy consumption and the emission of greenhouse gases, by changing energy infrastructure more efficiently. As a part of the SG, home energy management system (HEMS) has become increasingly important, because energy consumption of a residential sector accounts for a significant amount of total energy consumption. However, a conventional HEMS has some architectural limitations on scalability, reusability, and interoperability. Furthermore, the cost of implementation of a HEMS is very expensive, which leads to the disturbance of the spread of a HEMS. Therefore, this paper proposes an Internet of Things- (IoT-) based HEMS with lightweight photovoltaic (PV) system over dynamic home area networks (DHANs), which enables the construction of a HEMS to be more scalable, reusable, and interoperable. We suggest the techniques for reducing the cost of the HEMS with various perspectives on system, network, and middleware architecture. We designed and implemented the proposed HEMS and conducted a experiment to verify the performance of the proposed system.

Design and implementation of IoT-based HVAC system for future zero energy building

Zero energy building (ZEB) technologies are under investigation as a solution to problems of greenhouse gas emissions and energy depletion. Not only to solving energy problems, but also future ZEB needs to provide a comfortable environment for building occupants. A HVAC systems are significant parts of ZEB technologies. However, the existing HVAC systems have several problems. To solve the problem, in this paper, we propose a IoT-based HVAC system (I-HVACS) for indoor air quality (IAQ) management and reduction of building energy consumption. The I-HVACS is implemented and demonstrated in a real building which is a senior care center in Republic of Korea. The power consumption in the building is reduced by about 13.7% compared with the existing system.

Design of life-context for user-centric service in mobile environments

With the advent of the mobile networks and devices, a variety of user-centric services are being deployed based on personal mobile things. Generally, current services are provided based on users location information, which does not reflect individual characteristics and preferences. As a result, same information is provided to users. For more advanced user-centric services, it is important to create and manage information about user characteristics and preference. In this paper, we propose the life-context that represents the users service preferences. User-centric service based on the life-context provides different information even if two users are in the same place.

Design and implementation of Hyper-connected IoT-VR Platform for customizable and intuitive remote services

This paper proposes a Hyper-connected IoT-VR (HI) Platform that designed interconnection of human, device and space. We utilized the high interoperability of IoT platform based services and the intuitive services from VR contents. HI Platform can provide customizable and intuitive remote services. Furthermore, this paper shows a Hyper-connected IoT-VR Office (HIO) Zone in order to implement the HI Platform.

Design and implementation of personal ICT asset management service based on smart power socket

As the numbers of ICT assets consumers own are increasing, consumers have problems managing and maintaining their personal ICT assets. Consumers are used to unnecessary consumption because they cannot predict the lifetime of ICT assets. Also, consumers sometimes throw away old electronic devices including sensitive personal information. To solve these problems, the personal ICT Asset management service is proposed. The proposed service transfers invisible data into visible data using smart power sockets and a service platform, and it provides a convenient way to manage and maintain consumers ICT assets.

Securing Target Consumers and Markets through Developing Mission Statements: An Analysis of Company Mission Statements

We explore the nature of industry mission statements, and how a comprehensive and directed mission statement could lead to securing loyal consumers and successful industry performance. Through collecting and analyzing data on industry mission statements, we organize keywords extracted from the analysis, and further suggest methods in which companies can expand on through a clearly targeted mission statement.

Analysis of Types and Importance of Sensors in Smart Home Services

In the paradigm shift of smart home to smart city, more sensors and smart objects will be deployed for user-centric service. To design the advanced smart city, understanding and analysis of duplicated sensors in current smart home services is important. In this paper, we categorize the smart home services and analyze the types of sensors that used in the smart home, and then we estimate the importance of sensors using the sensor tree. As a result, the motion sensor has high importance score and it is used in 7 smart home services.

Design and implementation of an office standby–power management system through physical and virtual management by user–device habitual pattern analysis in energy–Internet of Things environments

In the changing environment of the Internet of Things, optimal energy management in smart spaces requires intelligent and reliable energy-aware-based context sensing and technologies that are capable of recognizing and analyzing the big-data user pattern. In this article, we propose an intelligent and reliable standby power management system. The system uses physical and virtual user behavioral pattern analysis based on energy-aware management to cut-off the standby power of office appliances in the office environment. We propose a two-step priority power-aware method. The first step entails physical perception and management that controls devices through user recognition and device relationship scenarios. The second step is virtual perception and management that controls the standby power by collecting user behavioral patterns and performs an analysis based on a rule mechanism. The proposed system was applied to three locations (offices A, B, and C) in the university test-bed. Power consumption was reduced to 23% of the original consumption through the elimination of unnecessary standby power consumption.

Energy-efficient lighting management system based on dynamic sensor activation method

In the existing lighting management system, motion sensors remain activated to detect users movement. The activated sensors result in a constant waste of energy. The proposed system dynamically activates or deactivates its motion sensors, efficiently reducing the energy consumption of the sensors.