• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.215-216
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• 2018

분산 컴퓨팅 환경에서 사용되어지는 빅 데이터 파일 시스템은 IoT(Internet of Things) 노드에서 처리해야할 데이터 탐색 시 모든 저장장치를 탐색하기 때문에 속도가 느리며 트래픽으로 인한 오버헤드가 발생할 수 있다. 본 연구에서는 IoT 노드의 분산 컴퓨팅 환경에서 빅 데이터를 좀 더 효율적으로 처리하고 빠른 검색을 위해 머신 러닝 기법을 이용한 분산 프레임워크를 제안하며 IoT 노드에서의 데이터 처리를 위해 다른 저장 장치로의 불필요한 액세스를 사전에 방지하여 빠르고 정확한 연산 결과를 도출하여 효율성을 향상 시키고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.994-996
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• 2016

글로벌 비즈니스 시장에서 IoT 산업은 급속도로 성장하고 있고 IoT에 대한 많은 연구가 진행되고 잇다. 그 중에서 스마트 홈 IoT 시스템이 대표적이며 이를 상용화하여 서비스를 제공하는 업체도 증가하고 있다. 홈 내부에 여러 IoT 장치와 센서들을 설치하고, 해당 장치와 센서에서 지속적으로 데이터가 생성되고 생성된 데이터를 저장하여 사용자에게 새로운 정보를 제공할 수 있다. 특히, 홈 내부에 설치된 여러 센서들의 데이터를 이용하여 현재 홈 내부 상황을 추론하여 집안 내부의 상황을 사용자에게 알려줄 수 있다. 본 논문에서는 스마트 홈 IoT 데이터를 베이지안 네트워크를 이용해 집안 내부의 쾌적 상황을 추론하여 사용자에게 정보를 제공하고 상황에 따른 행동을 할 수 있도록 정보를 제공하는 방법에 대한 연구의 결과에 대하여 소개한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.329-330
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• 2016

In the Private Cloud Environment, the data are collected by a variety of IoT devices and Cloud service users be provided with a variety of data collected. To take advantage of this convenient data, we propose the IoT data Processing framework using mobile agent.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.05a
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• pp.530-531
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• 2021

In this paper, I proposed a technique for identifying discrepancies between data input in the IoT sensor environment. The proposed technique can manage numerically input sensor data so that it can be applied to actual field problems. The proposed technique can detect when contradictory data is input from two or more sensors in an actual IoT sensor environment, and through this, it can be developed into a method that can identify and resolve sensor failure or intentional data disturbance.

• The Journal of the Korea Contents Association
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• v.21 no.7
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• pp.127-133
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• 2021

In industrial IoT environments, sensors generate data for their detection targets and deliver the data to IoT gateways. Therefore, managing large amounts of real-time sensor data is an essential feature for IoT gateways, and key-value storage engines are widely used to manage these sensor data. However, key-value storage engines used in IoT gateways do not take into account the characteristics of sensor data generated in industrial IoT environments, and this limits the performance of key-value storage engines. In this paper, we optimize the key-value storage engine by utilizing the features of sensor data in industrial IoT environments. The proposed optimization technique is to analyze the key, which is the input of a key-value storage engine, for further indexing. This reduces excessive write amplification and improves performance. We implement our optimization scheme in LevelDB and use the workload of the TPCx-IoT benchmark to evaluate our proposed scheme. From experimental results we show that our proposed technique achieves up to 21 times better than the existing scheme, and this shows that the proposed technique can perform high-speed data ingestion in industrial IoT environments.

• KEPCO Journal on Electric Power and Energy
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• v.4 no.2
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• pp.67-73
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• 2018

There are many types of power facilities such as transformers, switches, and energy storage devices in the micro grid environment. However, with the development of IoT technology, opportunities to acquire sensor information such as temperature, pressure, and humidity are provided. In the existing micro grid environment, the communication protocols such as MMS transport protocol in IEC 61850 standard is applied in accordance with the integrated operation between the power facilities and the platform. Therefore, to accommodate IoT data, a gateway technology that can link IoT data to a data collection device (FEP) based on IEC 61850 is required. In this paper, we propose IEC 61850 based IoT gateway platform prototype for microgrid operating system linkage. The gateway platform consists of an IoT protocol interface module (MQTT, CoAP, AMQP) and database, IEC 61850 server. For databases, We used open source based NoSQL databases, Hbase and MongoDB, to store JSON data. We verified the interoperability between the IoT protocol and the IEC 61850 protocol using Sisco's MMS EASY Lite.

• Journal of Advanced Navigation Technology
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• v.20 no.4
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• pp.374-379
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• 2016

Recently, IoT(Internet of Things) to connect the objects and people has attracted attention. And it is rapidly developing. IoT is to develop, experts are predicting that the device is connected to the Internet to break through around 100 billion within 10 years. However, the current IoT companies are having a difficult state to the other each other IoT platform for interaction between data silos effects. These silos effects will limit the IoT grow to a larger market. Thus, the IoT service supplier shall develop an open platform for interaction IoT data between each IoT platform. These web technologies for current open IoT platform has emerged. If developers are using familiar, easy-to-learn Web technologies, developers can take advantage of a variety of services for the collected data, and found the IoT devices can be bypassed if there is a problem on the network. In this paper, we investigate the data communications technology that can be used in WoT environment to overcome these silos effects. As a result, the polling method that can simply send the IoT information the fastest.

• KIPS Transactions on Computer and Communication Systems
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• v.3 no.11
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• pp.403-408
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• 2014

In the Internet of Things(IoT) era, many of the things or objects that enclose our environments are able to associate with those things on the Internet. To construct IoT systems, it needs to consider a component for acquiring and aggregating of sensory data via things with sensors and instruments, which is connected by diverse networks, in IoT environment. An IoT system is intrinsically distributed in a variety of ways. In addition, to manage an IoT system efficiently, interoperability is needed to meet requirements while the IoT system is designed to deliver data among its applications. In this paper, a reference architecture based on asynchronous messaging is defined and used for designing an IoT system. To apply the architecture, we discuss how to manage data streams with real-time characteristics and make a prototype based on pipe-and-filter to produce and consume them by a pub/sub messaging system NaradaBrokering.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.103-104
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• 2015

IoT의 주요 구성요소는 기존의 데스크 탑 외에 디바이스 즉, 단말 기기들이 주류를 이룬다. 이러한 IoT 디바이스들은 데이터의 유형이나 접근 방법이 다양하고, 실시간적 데이터 생산과 제어를 위한 양방향 데이터 접근 지원을 필요로 한다. 이러한 IoT 디바이스를 연결하여 클라우드 형 서비스로 개발하기 위해서는 디바이스 속성 관리가 용이한 도메인 관리 방법과 디바이스에 대한 일관된 접근 인터페이스를 제공하는 플랫폼이 필요하다. 이 논문에서는 리눅스 파일시스템 후면 즉, 사용자 영역에 리눅스 파일 시스템 스타일의 DB 기반 가상 파일시스템을 구축하여 IoT 디바이스를 연결하고 관리하는 프레임워크를 제시한다. 구현 가상 파일시스템은 계층적 디렉터리 체계를 DB에 유지하면서 단말 노드에는 지리적으로 산재한 IoT 디바이스들에 대한 속성 정보를 관리한다. 디렉터리 및 IoT 디바이스의 추가 삭제 검색 등 도메인 관리는 mkdir. mknod, ls, find 등 리눅스 고유 명령어로 이루어지고, 모든 IoT 디바이스에 대한 접근은 open(), read(), write(), close() 등 POSIX 인터페이스를 통해 가능하다.

• The Journal of Sustainable Design and Educational Environment Research
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• v.20 no.3
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• pp.25-32
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• 2021

This study analyzed the application articles of the Internet of Things (IoT) in the educational environment. It defined learning environmental data, utilization scenarios, and models that IoT can improve teaching and learning through Focus Group Interviews for academic experts, teachers, and technicians in related fields. In addition, the IoT pilot prototype was developed, verified, and drew implications from the perspective of collection, analysis, and utilization of real-time data based on the actual school settings. This study has significance as a priori case of building and applying a learning environment using the Internet of Things in real school settings considering relevant restrictions.