• Journal of the Korea Society for Simulation
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• v.29 no.2
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• pp.73-81
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• 2020

HCCL stands for Heterogenous Container Class Library. HCCL is a library that allows heterogeneous types of data to be stored in a container as a single record and to be constructed as a list of the records to be stored in database. With HCCL, encryption/decryption can be done based on the unified data type. Recently, IoT sensor which is embedded in smartphone enables developers to provide various convenient services to users. However, it is also true that infringement of personal information may occur in the process of transmitting sensor information to API and users need to be prepared for this situation in some sense. In this study, we developed a data model that enhances existing security using SEED cryptographic algorithms while managing information of sensors based on HCCL. Due to the fact that the Android environment does not provide permission management function for sensors, this study decided whether or not to encrypt sensor information based on the user's choice so that the user can determine the creation and storage of safe data. For verification of this work, we have presented the performance evaluation by comparing with the situation of storing the sensor data in plaintext.

• International Journal of Internet, Broadcasting and Communication
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• v.10 no.2
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• pp.51-59
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• 2018

Health care has attracted a lot of attention, recently due to an increase in life expectancy and interest in health. Various biometric data of the user are collected by using the air pressure sensor, gyro sensor, acceleration sensor, and heart rate sensor to perform the Smart Health Care Activity Tracker function. Basically, smartphone application is made and tested for biometric data collection, but the Arduino platform and bio-signal measurement sensor are used to confirm the accuracy of the measured value of the smartphone. Use the Google Maps API to set user goals and provide guidance on the location of the user and the points the user wants. Also, the basic configuration of the main UI is composed of the screen of the camera, and it is possible for the user to confirm the forward while using the application, so that accident prevention is possible.

• Journal of Platform Technology
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• v.9 no.4
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• pp.42-50
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• 2021

Recently, the need to introduce smart farms is increasing in order to solve the problems of intensifying competition such as a decrease in rural population due to aging, a decrease in production, and the inflow of foreign agricultural products, and accordingly, the need for education is increasing. This paper is a study on the implementation of an Android-based IoT smart farm for education so that it can be used in a real environment by reducing the farm's smart farm system. To confirm that Android-based education can be applied in a real environment using the IoT smart farm for education, experiments were performed in automatic mode and manual mode using Bluetooth, Wi-Fi, and server/client communication methods. In the automatic mode, the current status can be checked in real time by receiving all data, and in the manual mode, commands are transmitted in real time using the received sensor data and remote control is performed. As a result of the experiment, it was possible to understand the characteristics of each communication method, and it was confirmed that remote monitoring and remote control of the smart farm using the Android App was possible.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.12
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• pp.107-116
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• 2013

We proposed the WSN monitoring system applied the augmented reality to visualize effectively an indoor WSN. To implement system, we used wireless sensor network, indoor location determination, location-based augmented reality technology. First, we composed the wireless sensor networks indoors and implement web server and then get data from server DB using Android phones. Then, we obtained the (x, y) coordinates using the triangulation method from RSSI of three point of the strongest signal strength of the AP's. Also, we adjusted coordinates using the Kalman filter. Finally, we inserted the adjusted coordinates to the latitude and the longitude of the Mixare that use the GPS signal, and we got location of user and wireless sensor in the server DB. After that, we implemented augmented reality system using the android phone and wireless sensor location and data and real life image.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.4
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• pp.622-627
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• 2016

This paper describes the development of a portable potentiostat which can perform square wave voltammetry on electrochemical sensors and wireless transmission of the measured data to a smartphone using Bluetooth. The potentiostat consists of a square wave potential pulse generation circuit for applying the potential pulse to the electrochemical sensor, a reduction/oxidation (or redox) current measurement circuit, and Bluetooth for wireless data transmission to an Android-based smartphone. The measured data are then processed to show the output graph on the smart phone screen in real time. This data transformation into a graph is carried out by developing and installing a simple transformation application software in the Android-based smartphone. This application software also enables the user to set and change the measurement parameters such as the applied voltage range and measured current range at user's convenience. The square voltammetry output data measured with the developed portable potentiostat were almost same as the data of the commercial potentiostat. The measured oxidation peak current with the commercial potentiostat was $11.35{\mu}A$ at 0.26 V and the measured oxidation peak current with the developed system was $12.38{\mu}A$ at 0.25 V. This proves that performance of the developed portable measurement system is comparable to the commercial one.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.1
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• pp.97-102
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• 2016

In this paper, we propose an Android-based smart LED push notification system. The main feature and contribution of the proposed system are as follows. First, because it notifies messages using LED lights, it is possible to check anywhere in the house without carrying the smartphone. Second, the external control using Web2py can not only manages simple LED control but one can also add notification system indicating various conditions inside the house such as motion recognition sensor, temperature sensor. Performance evaluation of the proposed system is executed by two kinds of view point as: First, how to response instantly according to the incoming signal of LED control and notification in the given networks. Second, how to recognize the change of LED light. The results of experiment show that the efficiency and convenience of the proposed system is verified from the user's point of view.

• The Journal of the Convergence on Culture Technology
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• v.1 no.4
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• pp.107-111
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• 2015

Humans must restore tired bodies and minds during sleep. Sleep as much as eating a meal many people looking for a hospital can not sleep, but a matter of course. The smart phone is loaded in the most recent studies it has been conducted to provide a service to the patient or medical personnel U-healthcare in the field of smart phone-based medical applications as with a variety of sensors, including an acceleration sensor. In this paper, the aim of providing an Android-based applications to use a variety of sensors incorporated in the popularity of smart phones to induce normal water flow to recognize the user's action.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.117-118
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• 2019

본 논문에서는 스마트 폰의 GPS 센서와 구글 맵 기반의 음식점 정보제공 연동이 자유로운 어플리케이션을 설계하고 구현한다. 이 어플리케이션은 안드로이드 내장 센서를 이용하여 현재 사용자의 위치를 기준으로 반경 30m 안의 음식점 정보는 초록색 반원에서 확인할 수 있다. 그리고 구글 맵에서 마커는 메뉴별로 다르게 하여 카테고리마다 마커가 다르게 표시된다. 또한, 상단에 메뉴를 선택할 수 있게 하여 메뉴별로 필터를 가능하게 함으로써 크게 한식, 양식, 일식, 중식, 분식, 후식, 패스트푸드 등으로 분류되어 사용자 주위에 있는 음식집을 빠르게 선택할 수 있도록 구현한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.93-94
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• 2020

본 논문에서는 스마트폰의 GPS 센서와 구글 지도기반의 즉석 모임 정보제공 연동이 자유로운 애플리케이션을 설계하고 구현한다. 이 애플리케이션은 안드로이드 내장 센서를 이용하여 현재 위치를 기준으로 반경 1Km을 파란색 반원으로 표시하며 빠르게 접근할 수 있는 모임을 확인할 수 있다. 그리고 즉석 모임 중 자주 이루어지는 택시, 테니스같이 혼자 할 수 없는 운동, 등과 같이 주요 모임별로 다르게 표시하여 정보를 보지 않아도 직관적으로 어떤 유형인지 알 수 있도록 구현한다. 또한, 마커를 클릭하면 해당 모임에 관한 정보를 확인할 수 있고, 장소 근처에 가면 알람을 보낼지 선택할 수 있는데 지도 하단에 버튼을 통해 알람 설정한 모임을 관리 할 수 있다. 위치기반 알람을 통해서 모임에 대한 정보를 까먹지 않게 계속 알려줌으로써 참여율을 높일 수 있도록 구현한다.

• Journal of Multimedia Information System
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• v.2 no.2
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• pp.233-240
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• 2015

Mobile devices are becoming increasingly sophisticated and the latest generation of smartphones now incorporates many diverse and powerful sensors. These sensors include acceleration sensor, magnetic field sensor, light sensor, proximity sensor, gyroscope sensor, pressure sensor, rotation vector sensor, gravity sensor and orientation sensor. The availability of these sensors in mass-marketed communication devices creates exciting new opportunities for data mining and data mining applications. In this paper, we describe and evaluate a system that uses phone-based accelerometers to perform activity recognition, a task which involves identifying the physical activity that a user is performing. To implement our system, we collected labeled accelerometer data from 10 users as they performed daily activities such as "phone detached", "idle", "walking", "running", and "jumping", and then aggregated this time series data into examples that summarize the user activity 5-minute intervals. We then used the resulting training data to induce a predictive model for activity recognition. This work is significant because the activity recognition model permits us to gain useful knowledge about the habits of millions of users-just by having them carry cell phones in their pockets.