• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.20 no.2
• /
• pp.157-163
• /
• 2020

Recently, fine dust has been known to cause cardiovascular diseases here, raising interest in ways to reduce emissions by efficiently using fuel from cars that cause air pollution. Accordingly, a driving assistance system was developed to save fuel by eco-driving and improve the driver's bad driving habits. The system was developed using raspberry pi, arduino and Android. Using RPM, speed, fuel injection information obtained from OBD-II, and gyro-sensor values, Fuel-Cut is induced to create an optimal inertial driving environment. It also provides various information system such as weather, driving environment, and preventing drowsy driving through GUI and voice recognition functions. It is possible to check driving records and vehicle fault information using Android application and has low overhead for message transmission using MQTT protocol optimized for IoT environment.

• Journal of Korea Society of Industrial Information Systems
• /
• v.25 no.5
• /
• pp.91-102
• /
• 2020

The Internet of Things (IoT) is characterized as the market where various companies compete for the same consumers. Thus, there are differences in functions and performance provided by the main business area and other characteristics of the service providers. This paper investigates whether satisfaction with the service provided depends on the characteristics of the operator by using sentiment analysis of comments. To achieve this goal, word importance analysis and sensitivity analysis are conducted on 34,310 reviews of 41 applications registered in the Google Play. The review analysis was conducted at various levels, including TD-IDF (Term frequency-inverse document frequency) value of keywords, service sectors, the origin of providers, and domestic/foreign providers. The results show that users' overall assessment of IoT services was found to be low, and smart homes received relatively high reviews compared to other services, and manufacturing-based and overseas providers received relatively higher evaluations than others.

• Journal of Convergence for Information Technology
• /
• v.8 no.6
• /
• pp.217-223
• /
• 2018

Real-time controllability has been a major challenge that should be addressed to ascertain the practical usage of the management systems. In this regards, for the first time, we proposed and implemented an IoT(Internet of Things)-based water tank system to improve convenience and efficiency. The reservoir can be effectively controlled by notifying the user if the condition of the reservoir is unstable. The proposed system consists of embedded H/W unit for sensor data measuring and controling, application S/W for deployment of management server via web and mobile app, and efficient database structure for managing and monitoring statistics. And machine learning algorithms can be applied for further improvements of efficiency in practice.

• KIISE Transactions on Computing Practices
• /
• v.21 no.3
• /
• pp.215-222
• /
• 2015

In this paper, the Digital DoorLock by Internet of Things (DDiT) is introduced. In order to implement DDiT, an integrated micro-controller platform, Arduino is used to control an existing digital doorlock and an android type smart phone is adopted as a mobile platform. One of the advantages of DDiT is that it can be added to an existing digital doorlock and a smart phone application is used as a digital key. Owing to the smart phone application, several other types of applications could also be made. Therefore, DDiT could be used effectively and conveniently in ordinary homes as well as in high security applications such as in hotels, institutes, and companies.

• Smart Media Journal
• /
• v.11 no.3
• /
• pp.39-53
• /
• 2022

Cloud of Things (CoT) can provide IoT applications with unlimited storage functions and processing power supported by cloud services. However, in a centralized cloud of things, it can create a single point of failure that can lead to bottleneck problems, outages of the CoT network. In this paper, to solve the problem of centralized cloud of things and interoperate between different service domains, we propose an IoT service interoperability system using distributed fog computing and blockchain technology. Distributed fog is used to provide real-time data processing and services in fog systems located at a geographically close distance to IoT devices, and to enable service interoperability between each fog using smart contracts and distributed ledgers of the blockchain. The proposed system provides services within a region close to the distributed fog entrusted with the service from the cloud, and it is possible to access the services of other fogs without going through the cloud even between fogs. In addition, by sharing a service right token issuance information between the cloud and fog nodes using a blockchain network, the integrity of the token can be guaranteed and reliable service interoperability between fog nodes can be performed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2015.05a
• /
• pp.890-891
• /
• 2015

With South Korea entering aging society, the problem of the elderly living alone is aggravating due to increasing health risks associated with social isolation. This should be counteracted by providing them with supports conducive to the recovery of social relationship and effective management of daily activities, such as health checkups, homecare services, chore services, and contents building for information service. This paper presents a human care system implementing miniaturization and portability for the elderly and other care recipients by integrating various contents into recipients' situation perception, direct experience, and sensor modules as a smartphone application in Internet of Things environment to facilitate their health status monitoring.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.27 no.1
• /
• pp.65-71
• /
• 2017

Since existing Internet of Things(IoT) is vulnerable, it may cause property damage due to the information leakage. Especially, the smart door lock system built on the IoT can cause more damage. To solve these problems, this paper classify the data generated by the sensor according to the condition and send an alarm message to the user's smartphone through Google Cloud Message (GCM). We made it possible to check the images in real time through the smartphone application and control the door lock using the TCP / IP protocol. Also, we applied OTP-Based Matrix SEED algorithm to door lock system to improve security.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2021.11a
• /
• pp.1140-1143
• /
• 2021

예부터 최근까지 세계적으로 해마다 자전거 도난의 문제가 빈번히 발생하고 있고 자전거 자물쇠를 지니고 다녀야 하는 번거로움 또한 발생하고 있다. 현재 자전거 절도가 가장 생활범죄에서 1순위를 차지하고 국가적으로 봐도 많은 도난이 발생하고 있는 나라가 우리나라이지만, 이에 대한 해결책이 미비하며 국가에서의 관심이 턱없이 부족하여, 효율적인 해결방안이 없다. 이러한 문제점을 해결하기 위해 본 논문에서는 현대인에 맞는 스마트한 IOT 자전거 도난 방지 시스템을 제안하고 개발한다. 개발한 시스템은 상황에 맞는 대처 및 시스템 실시간 관리를 통해 사람들이 많이 지니고 다니는 스마트폰에 애플리케이션을 이용하여 긴급상황에 적절하게 대처하여 안전 운행을 가능하게 한다. 또한 현시대에 맞게 휴대성을 위하여 최대한 소형화하고 이에 걸맞은 보안 시스템을 개발함으로써 차후 다양한 분야에 상용화하는 발전 가능성을 기대한다.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2023.07a
• /
• pp.281-282
• /
• 2023

본 논문에서는 안드로이드 앱 기반의 스마트폰에 내장된 GPS센서와 IoT 기반의 사고 감지 시스템을 융합하여 실시간 교통사고를 알려주는 자동화 시스템을 설계하고 구현한다. GPS 센서를 통해 사용자의 위치를 감지하고 사고 현장의 GPS와 정보를 무선 네트워크와 MQTT기반의 프로토콜로 전달받아 실시간으로 사고 현장을 알려주는 역할을 한다. 소방관이나 경찰관같은 업무 처리자의 경우 직접적인 신고가 아닌 자동화로 업무의 환경을 개선해 골든 타임을 확보를 용이하게 한다.

• Journal of the Korea Convergence Society
• /
• v.11 no.10
• /
• pp.53-61
• /
• 2020

Recently, as the uncontact service is activated in earnest due to the Corona 19 virus, the necessity of system development to provide non-face-to-face contact remote medical service has increased. In this study, we propose a smart healthcare system, Rm_She(Remote Medical Smart Healthcare System). Rm_She can collect and manage various vital signs information by connecting various healthcare products that detect bio-signals based on IoT to one application. The health check app (HC_app) is used to connect vital sign measurement devices to a wireless LAN and receive vital sign values from the HC_app. Then, the vital signs are output to the user on the smartphone, and the corresponding information is transmitted to the healthcare management server. The healthcare server receives the measured values and stores them in a database, and the stored measured values are provided as a web service so that medical staff can remotely monitor them in real time.