• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.537-539
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• 2014

Recently, the Univeral Plug and Play (UPnP) Form has relased UPnP Cloud, which is an extension to the basic UPnP architecture that enables device to device connectivity across the Internet. UPnP Cloud uses the Extensible Messaging and Presence Protocol (XMPP) to connect devices located in different domains. In this paper, the details of the UPnP Cloud are presented. We demonstrate how UPnP Cloud enables contents to be shared remotely, and how it can be used in connection with DLNA.

• Journal of KIISE
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• v.42 no.7
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• pp.939-945
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• 2015

From 2009, the market of smart devices has been rapidly increasing. These devices provide various services to users. The cloud messaging service, especially, is applied to many various services, and sends messages asynchronously. In the cloud messaging service, there are two methods for message transmission, message transmission based on an IP address and a publish/subscribe technique. Each technique uses basic messages in order to send messages to mobile devices. In this paper, the hybrid message transmission, based on user-customized analysis to reduce basic messages, is proposed. The hybrid message transmission uses Exponential Moving Average (EMA) and K-means algorithms for user-customized analysis, and determines the message transmission techniques in each timeslot.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.213-214
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• 2016

본 논문에서는 모바일환경을 활용하여 인터넷 접근이 어렵고 인터넷 사용이 불편한 사용자를 중심으로 개발한 일상생활에서의 냉장고 정리, 쾌척 등과 같이 냉장고 사용의 편리성을 위하여 안드로이드 5.1 버전의 스마트폰 Application으로 개발하였다. 이를 해결할 시스템을 구현하기 위해 GCM(Google Cloud Messaging) Server를 활용하였고, 서버에서 특정 시간이 도래되어 클라이언트로 메시지를 전송하면 사용자의 안드로이드 폰으로 푸시 메시지(Push Message)가 수신되는 방식으로 구현하였다. 안드로이드 환경을 기준으로 실행하기 위해 APACHE CORDOVA를 기반으로 CORDOVA PLUGIN에 있는 Camera 기능을 사용하였고 사용자 안드로이드에 있는 사진을 업로드하거나 즉석에서 사진을 촬영하여 앱에 올릴 수 있는 기능을 사용자 편의성을 고려하여 개선하였다. 사용자의 편리성, 가독성 등을 고려하여 개발함으로써 사용자는 활용성이 높은 사용자 인터페이스를 통해 냉장고를 정리하고 관리할 수 있을 것으로 기대하고 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.986-988
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• 2013

본 논문에서는 GCM(Google Cloud Messaging) 서비스를 활용한 영단어 암기용 스마트폰 어플리케이션을 개발하였다. 서버에 있는 영단어 데이터베이스에서 스마트폰으로 영단어를 주기적으로 출력하여 사용자가 영단어에 자연스럽게 노출될 수 있는 어플리케이션을 개발하였다. 추가적으로 잠금 화면을 영단어와 뜻을 매칭 시켜 해제시키는 시스템을 구축함으로써 영단어를 더욱 더 효과적으로 암기할 수 있는 환경을 제공한다. 현재 안드로이드 마켓에서 제공되고 있는 영단어 암기 어플리케이션과 달리 개발한 어플리케이션은 한 번 설정 후 직접 실행할 필요가 없도록 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.5-7
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• 2020

본 논문에서는 응급상황 발생 시, 응급 처치가 가능한 주변 사용자에게 알람을 보내 구급대원이 오기 전까지 응급 구조를 원활하게 도와주는 안드로이드 애플리케이션 시스템 구현 결과를 보인다. Google Map API를 이용하여 사용자의 위치를 실시간으로 지도에 표시한다. 그리고 FireBase Cloud Messaging API를 이용하여 애플리케이션 이용자들에게 알람을 보낸다. 또한, WebRTC API를 이용하여 애플리케이션 안에서 음성 및 영상 통화를 할 수 있다. 애플리케이션을 켜지 않아도 위젯을 활용하여 응급상황을 신고할 수 있도록 하여 애플리케이션의 활용성을 높였다.

• Journal of Industrial Convergence
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• v.20 no.8
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• pp.61-67
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• 2022

The Internet of Things(IoT) is one of the key technologies in the Fourth Industrial Revolution. The IoT is a system that acquires information from various sensors and provides meaningful information to users. The method of obtaining information from sensor is using WIFI, Bluetooth and Server. is not accessible to external users because of different type of networks or local area communication. For this reason, there is a problem that external user cannot receive notification in regard to sensor information. In this paper, we want to establish a cloud message environment using Google's FCM(Firebase Cloud Messaging) and find out through experiments how users can receive notifications even if they are outside.

• Journal of Digital Convergence
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• v.15 no.4
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• pp.285-293
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• 2017

They are rapidly evolving malicious attacks on smart devices, and to timely protect the smart devices from these attacks has become a very important issue. In particular, smishing attack has emerged as one of the most important threats on the smartphone. In this paper, we propose the cloud service that can fundamentally protect the user from the risk of smishing attack. The proposed scheme provides cloud messaging service that can filter text messages including URLs in the user's smart device, view and manage them through a virtual machine provided by a cloud server. The existing techniques for preventing smshing attacks protect only malicious code of a known pattern and there is the possibility of error such as FP(False Positive) or FN(False Negative). However, since the proposed method automatically filters all text messages including URLs, storing, viewing, and managing them in their own storage space on the cloud server, it can completely block the installation of malwares(malicious codes) on the user's smart device through smishing attacks.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.5
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• pp.1163-1172
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• 2015

In this paper, an MQTT based protocol is designed and implemented for control, management and monitoring of HVAC in a cloud platform in real time. The MQTT protocol is a two-way messaging protocol, and has the generality, flexibility, light weighted, quickness with reliability and security. In the implemented system, performance and reliability of the communication protocol is considered for data acquisition and control between the CCU and the cloud server. Control and monitoring for the cloud server is performed in real time in conjunction with CCU and the MQTT server.

• Journal of Korea Multimedia Society
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• v.24 no.8
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• pp.1101-1113
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• 2021

The rapid growth of sense-and-respond applications and the emerging cloud computing model present a new challenge: providing publish/subscribe middleware as a scalable and elastic cloud service. The publish/subscribe interaction model is a promising solution for scalable data dissemination over wide-area networks. In addition, there have been some work on the publish/subscribe messaging paradigm that guarantees reliability and availability in the face of node and link failures. These publish/subscribe systems are commonly used in information-centric networks and edge-fog-cloud infrastructures for IoT. The IoT has an edge-fog cloud infrastructure to efficiently process massive amounts of sensing data collected from the surrounding environment. In this paper. we propose a quorum-based hierarchical fault-tolerant publish/subscribe systems (QHFPS) to enable reliable delivery of messages in the presence of link and node failures. The QHFPS efficiently distributes IoT messages to the publish/subscribe brokers in fog overlay layers on the basis of proposing extended stepped grid (xS-grid) quorum for providing tolerance when faced with node failures and network partitions. We evaluate the performance of QHFPS in three aspects: number of transmitted Pub/Sub messages, average subscription delay, and subscritpion delivery rate with an analytical model.

• International Journal of Internet, Broadcasting and Communication
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• v.8 no.1
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• pp.19-26
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• 2016

In this paper, the existing domestic HVAC systems, devices TCP / IP does not support the most, thereby, not performed remote management, it is necessary to regularly field service, inefficiency and cost bring a burden. This is through a comparison of the IoT-based primary, real-time protocol of what has become a hot topic recently, to be able to control and real-time monitoring through the CCU device in the HVAC system. Compare for this Internet of Things device for real-time monitoring and control of the XMPP, CoAP, MQTT main real-time protocol is used on. Finally, flexibility, light weight, based on MQTT a two-way messaging protocols with reliable message delivery, implements the protocol on the real-time HVAC system in the cloud platform.