• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.4
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• pp.701-706
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• 2017

In this study, existing remote control or the cradle manually drives to recognize the voice of the way and through the app the Cradle to work with a motor. In addition, the temperature and humidity sensor was mounted in the cradle, the temperature and humidity of the cradle can be checked through the LCD. Depending on the sound size of the sound sensor, the resulting value was used to indicate a value of a, b, c, and the sum of the results over 1150, the cradle was recognized as the baby's crying, then, notificate and alarm on app.

• Journal of Korea Society of Digital Industry and Information Management
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• v.11 no.1
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• pp.37-45
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• 2015

As of June 2014, the rate of mobile internet users aged 6 and over is estimated at 98.3% (up by 2.8%p from the previous year). The vast majority of the teens (99.7%), the 20s (99.8%), the 30s (99.8%), and the 40s (98.1%) answer they use the smart phone. The existing notice methods have utilized noticeboard in the apartment. It is difficult to support real-time notice. The App has a merit to be accessed in anywhere, so that it is quite suitable for services requiring real-time support. This paper describes a development of apartmenrt notice and decision-making service using smart phone. We study previous researches about apartmenrt notice Apps. Then, we described the notice flow diagram and decision-making flow diagram. Apt admin sends the important notice message to residents using apt notice app in real-time. Apt admin writes the decision item in the admin web site. It pushes decision item to residents using apt notice app in real-time. The residents vote and send it to Apt admin. Apt admin counts the votes and send the collect the vote result to to residents.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.351-354
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• 2021

본 연구에서는 기존 업체들이 활용하고 있는 반려동물 생체인식 기술 기반 통합 서비스 앱을 제안한다. 이 앱은 반려동물 미등록자의 미등록 사유를 바탕으로, 접근성 및 노출 빈도가 높은 스마트폰 앱으로, 등록 방식은 안면, 비문, 홍채, DNA 등록을 활용한다. 하나의 생체인식 방법을 사용하는 것이 아닌 다중 인식 방법을 제공하고, 각 인식 방법별 정확도의 비중을 달리하여 오차를 줄이고, 기존의 등록 방식 및 앱과의 차별화를 시도하고자 한다. 또한, CUPET 앱은 단순 등록에 그치지 않고, 실종 및 유기 동물 찾기, 예방접종 주기 및 반려동물 생애주기 정보 제공, 사용자들의 데이터 및 병원 연계를 통해 반려동물 유형별 병원 추천 등의 서비스를 제공하고자 한다. 본 연구에서 제안하는 CUPET 앱을 통하여, 등록 방식의 간략화로 반려동물 등록률 증가, 개인의 반려동물 인식 장치 소유 가능으로 실종 및 유기 동물에 대한 신속한 보호가 가능할 것으로 사료된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.136-139
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• 2021

사물인터넷을 기반으로 실시간으로 소화기 주변의 상태와 화재 발생 여부, 소화기의 상태를 확인할 수 있는 웹 시스템과 화재 알림을 받을 수 있는 애플리케이션을 설계하였다. 소화기 주변의 온도와 습도를 측정하여 화재 유무를 판단하고, 화재를 감지했을 시에 LED 불빛과 경고음을 출력한다. 자이로센서를 이용하여 소화기의 쓰러짐 상태를 파악한다. 웹페이지에서 소화기의 상태 및 소화기 주변의 온습도 상태, 화재 여부를 확인할 수 있다. 사용자는 애플리케이션을 이용하여 회원가입, 로그인을 수행할 수 있으며 화재 알림을 받을 수 있다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.425-426
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• 2021

Recently, there have been frequent incidents of talent accidents caused by youth driving without a license. Driving without a license is becoming a hotbed of curiosity and challenge for some young people, and there is a limit to managing smart keys at home to prevent this. Therefore, in this paper, using the facial recognition algorithm, the face of the driver sitting in the driver's seat is compared with the information stored in advance, and the system is designed to control the engine by determining that it is a registered driver. If the registered driver authentication is successful, the matching accuracy and Unlock message are output to the LCD connected to the Raspberry Pi.

• Journal of Korean Tunnelling and Underground Space Association
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• v.24 no.5
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• pp.411-429
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• 2022

Instrumentations are essential in NATM tunnels, however measuring instruments are installed and applied without performance verification procedures due to insufficient research on methods, procedures, regulations, etc. to verify the reliability of the measuring instruments. In this study, domestic and foreign regulations relating to the verification and calibration of instruments were investigated and necessities for accreditation standards were proposed. In order to identify the causes of the defects, an external inspection was performed on rock bolt stressmeter and rod extensometer, which are measuring instruments with relatively complex structures. For verifying the performance of these instruments, verification devices were developed that can load step-by-step and the causes of defects were identified in measuring instruments of nine domestic manufacturers. Through the performance test, a number of measuring instruments were found to be defective. It was important to test the performance of the instruments in the state of a finished product and accordingly performance inspection methods and procedures were proposed. The results of this study are expected to help preparing related regulations for verifying instrument performance and selecting instruments in the field.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.44 no.1
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• pp.8-15
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• 2007

This paper proposed hardware architecture of the block cryptographic algorithm HIGHT aiming small size and low power application, and analyzed its performance. The HIGHT is a modified algorithm of the Feistel. The encryption and decryption circuit were designed as one iterative block. It reduces the redundant circuit that yields small area. For the performance improvement, the circuit generates 32-bit subkey during 1 clock cycle. we synthesized the HIGHT with Hynix $0.25-{\mu}m$ CMOS technology. The proposed circuit size was 2.658 EG(equivalent gate), and its power consumption was $10.88{\mu}W$ at 2.5V for 100kHz. It is useful for a passive RFID tag or a smart IC card of a small size and low power.

• Journal of the Korea Society of Computer and Information
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• v.25 no.2
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• pp.113-122
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• 2020

In this paper, we propose the terminal authentication system using blockchain and TOTP(Time-based One-time Password Algorithm) to sustain a continuous authentication between user device and service device. And we experiment this system by using door-lock as a terminal of IoT(Internet of Things). In the future, we can apply this result to several devices of IoT for convenience and security. Although IoT devices frequently used everyday require convenience and security at the same time, it is difficult for IoT devices having features of the low-capacity and light-weight to apply the existing authentication technology requiring a high amount of computation. Blockchain technology having security and integrity have been used as a storage platform, but its authentication cannot be performed when the terminal cannot access any network. We show the method to solve this problem using Blockchain and TOPT.

• Journal of Convergence for Information Technology
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• v.11 no.9
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• pp.214-220
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• 2021

With the rapid spread of smartphones, it has become common to listen to music everywhere, just like background music in life, so it is necessary to create a music database that can make recommendations according to individual circumstances and conditions. This paper proposes a music recommendation model through social media. Since emotions, situations, time of day, weather, etc. are included in hashtags, it is possible to build a social media-based database that reflects the opinions of various people with collective intelligence. We use web crawling to collect and categorize different hashtags from posts with music title hashtags to use real listeners' opinions about music in a database. Data from social media is used to create a music database, and music is classified in a different way from collaborative filtering, which is mainly used by existing music platforms.

• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.4
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• pp.531-538
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• 2022

In this study, the self-healing hybrid capsules were prepared, were mixed with 3 %, 5 %, and 7 % based on cement mass. The healing performance were evaluated according to mixing ratio self-healing hybrid capsule. As a result of the experiment, it was found that the crack healing performance improved as the mixing rate of the self-healing hybrid capsule increased, but the quality performance tended to decrease. Therefore, it is judged that using the mixing ratio of the hybrid capsule within 5 % reduces the quality performance to within about 10 % and secures about 90 % or more of the healing performance.