• The Journal of the Korea Contents Association
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• v.20 no.11
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• pp.228-236
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• 2020

As of March 2020, this study divided the applications for young children installed on Android-based smart-phones in Korea into top and bottom groups according to review scores, and selected 30 applications each, conducted content analysis and application evaluation, and looked at differences between groups. Through this, by providing objective information on the smart-phone application for young children, it is intended to help parents and early childhood education professionals select high-quality applications, and to present ideas and directions for developing applications suitable for development to application developers. As a result of application content analysis, only data presentation type, simulation type, and game type were found in all the top and bottom groups as for the application type. There was a difference in order. In the case of app purchase cost, the top group in the review score was evenly distributed from the low price to the high price of 100,000 won or more, while the bottom group had few high-priced applications. On the other hand, as a result of application evaluation, a significant difference was found in the entire evaluation score, including all functional elements and all content elements, between the top and bottom groups of the review score. In the case of detailed sub-factors, significant differences were shown in all factors except 'technicality' of functional elements.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.9
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• pp.745-752
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• 2016

In the era of the Internet of Things, where all physical objects are connected to the Internet, we suggest a remote control system using a Raspberry Pi single-board computer with ZigBee, which can turn an indoor light-emitting diode (LED) and a multiple-tap on and off, and with a smart phone can control the brightness of the LED as well as an electronic door lock. By connecting an infrared (IR) transmitter module to the Raspberry Pi, we can control home appliances, such as an air conditioner, and we can also monitor indoor images, indoor temperatures, and illumination by using a smart phone app. We developed a method of finding out IR transmission codes required for remote-controllable appliances with an AVR micro-controller. We suggest a method to remotely open and shut an office door by novating the door lock. The brightness level of an LED (between 0 and 10) can be controlled through a PWM signal generated by an ATmega88 microcontroller. A mutiple-tap is controlled using an ATmega32, a photo-coupler, and a TRIAC. The signals for measured temperature and illumination are converted from analog to digital by using the ATtiny44A microcontroller transmitting to a Raspberry Pi through SPI communication. Then, we connect a camera to the CSI head of the Raspberry Pi. We can turn on the smart multiple-tap for a certain period of time, or we can schedule the multi-tap to turn on at a specific time. To reduce standby power, people usually pull out a power code from multiple-taps or turn off a switch. Our method helps people do the same thing with a smart phone, if they are away from home.

• Journal of Korea Multimedia Society
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• v.20 no.8
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• pp.1200-1207
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• 2017

Sensors in a smartphone can be used to measure various physical quantities. In this paper, we propose an object localization scheme in a three dimenstional using a smart phone. The proposed scheme estimates the location of an object by observing it from several different points. The direction to the target object and the locations of the observation points are collected at each observation point using the location sensor and the orientation sensor in the smartphone. Based on these observations, the proposed scheme derives three dimensional line of sight vectors and estimates the location of the target object that minimizes the estimation error. We implemented the proposed scheme on an Android smartphone and tested its performance by estimating the height of a building and characteristics of the proposed approach.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.185-186
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• 2016

안전사고 발생 위험요소가 산재한 사업장 내에서의 이상 징후를 파악할 수 있는 안전관리 시스템의 구축이 필요하다. 또한 사람이 직접 안전관리를 하는 것이 어려운 장소와 사업장 환경의 변화가 중요한 경우까지 고려하고, 실시간으로 정보를 관리하고 대처할 수 있는 방법이 요구된다. 본 연구에서는 유해가스 누출에 열악한 작업환경에서 인명보호 및 안전사고 예방을 위한 작업자 중심 사고 예방을 위한 다중센서 BLE 디바이스개발과 스마트폰 서비스를 연계방법에 대한 시스템을 제안한다. 제안된 시스템은 AQ, AP, Motion, SmartPhone App, Server로 구성하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06b
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• pp.255-257
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• 2011

본 논문은 스마트폰 환경에서 만성질환자의 약복용 순응률을 향상시키기 위한 앱을 모델링하고 구현하였다. 이 앱은 일상생활을 하면서 장기간 규칙적으로 약을 복용해야 하는 환자들을 대상으로 약복용을 지원할 수 있도록 모델링되었다. 또한, 스마트폰을 통해 모바일 환경에 있는 환자에게 약복용 알림, 복약지도, 순응률 조회 등의 모니터링 서비스를 제공한다. 앱 서버는 환자들의 약복용 스케줄 데이터를 관리하며, 이 데이터는 3GS 통신을 통해 스마트폰과 동기화 된다. 순응률은 약복용 알림에 대해 환자의 대응에 따라 자동으로 계산되며 조화될 수 있다. 이 앱 통신은 국제표준 IEEE P11073-10472으로 구현되었다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.01a
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• pp.65-66
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• 2015

안압지에는 임해전이라는 정자가 있다. 임해전 내부에는 안압지 조감도가 중앙에 놓여 있고, 가장자리를 따라 안압지에서 출토된 유물들이 전시되어 있다. 그래서 안압지 관광 가이드 앱을 구현하려면 임해전 내부에서 사용자 위치를 판정하는 실내 측위 앱이 있어야 한다. 스마트폰 센서를 이용한 실내측위 방법으로 추측항법 방법이 가장 적당하다. 추측항법을 구현하려면 출발점 좌표를 알아야 하는데, 본 연구에서는 사용자가 임해전 내로 진입하는 순간을 포착하여 임해전 입구를 출발지점으로 지정한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.01a
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• pp.163-164
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• 2015

최근 로봇 기술은 전자공학, 컴퓨터, 기계공학 등의 비약적인 발전에 힘입어 다양한 용도에 사용되고 있다. 특히 로봇은 극한 환경에서 인간이 실천하기 어려운 작업을 수행할 수가 있으며, 인간과 함께 운용되거나 인간이 로봇을 무선으로 제어하여 현장을 확인을 할 수 있으며 이를 통하여 화재진압 및 인명구조를 수행할 수 있다. 이 때 무선 제어 로봇은 탐사 시 동체가 전복되더라도 지속적인 탐사가 가능해야 한다. 따라서 로봇의 동체보다 바퀴를 크게 하여 동체가 전복해도 동작이 가능하도록 한다. 본 논문에서는 무선 조정 자동차를 사용 하여 차체의 전복에도 충분히 제어 및 탐사가 가능한지 실험하고, 초음파센서로 하여금 능동적으로 장애물 회피를 하는 것을 목적으로 한다.

• Asia-Pacific Journal of Business
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• v.8 no.1
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• pp.15-32
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• 2017

This study was designed to examine the antecedents of mobile app usage among smart phone users. An extended TAM, which included the additional factors of perceived enjoyment, perceived informative usefulness and perceived social usefulness, was applied to predict people's intention to use mobile apps. Overall, the hypothesized research model did a fairly good job explaining significant associations between the independent variables and the dependent variable. The findings had showed that perceived social usefulness, perceived enjoyment and attitude were significantly affect intention to use mobile apps. Meanwhile, perceived ease of use (PEOU) and perceived informative usefulness were not significantly effects attitude towards intention to use mobile apps. Therefore, mobile apps developers should develop mobile apps that are easier for the users to seek information. For the information available should be more precise and bringing more benefits to the users.

• Journal of Korea Multimedia Society
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• v.18 no.2
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• pp.97-105
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• 2015

When people go to travel, sometimes one writes many articles about the destination. Existing travel information services such as Blog, Internet Cafe, and SNS are difficult to provide realistic information since the provided information may not be a place directly on the road. This paper presents a travel information system including recommended courses, theme courses, and travel map. In addition, the proposed system can provide the functions of writing, reading, and deleting a message note that stores the travel information based on the augmented reality if a defined marker among the community members is recognized in a smartphone App. Therefore, this paper can present an implementation method for new community system using augmented reality and image processing as well as providing the conventional travel information services, and allows the user to take advantage of the realistic and accurate information.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.211-213
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• 2017

효율적인 학습활동을 위해 중요한 것 중 하나는 학습자의 학습의지다. 학습자의 학습동기를 유발할 수 있는 게임을 학습과 접목하여 학습내용으로 설정하고 프로그래밍 교육을 설계해보고자 한다. 교육도구로는 학습자들에게 친숙한 도구이자 일상생활에서 떼어놓을 수 없는 스마트 폰을 활용하고자 하며 프로그램으로는 앱 제작 프로그램인 앱 인벤터를 활용하고자 한다. 본 게임제작기반 교수학습설계를 통해 다양한 경우의 컴퓨팅 사고력을 훈련함으로 분석력, 논리력, 창의력 향상을 통한 문제해결력 신장과 제4차산업혁명시대에 적응할 수 있는 창의적 인재양성을 기대한다.