• 한국초등과학교육학회지:초등과학교육
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• 제39권4호
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• pp.522-532
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• 2020

The aims of this study were to do a survey on teachers' perception and operational state for elementary science online remote classes and suggest ways to improve the elementary science online remote classes. The survey was based on responses from 100 teachers who have taught elementary science online remote classes for the first semester of 2020 for COVID-19. The questionnaire used in this study consisted of four parts: general informations of participants, the operation status of elementary science online remote classes, teachers' perceptions on the operation of elementary science online remote classes, ways to improve elementary science online remote classes. As a result of this study, elementary teachers taught elementary science online remote classes on the main use of content utilization type. And they had a difficulty in conducting elementary science online remote classes because of lack of contents, absence of elementary science online remote classes teaching methods, learner management and heavy workload. Therefore, to improve elementary science online remote classes the Ministry of Education and regional offices of education have to develop and provide high-quality contents reflect the characteristics of elementary science subjects, introduce a rent-an-experiment equipment system, and build a science class platform providing frequent real-time interaction between teacher and student.

• 한국항행학회논문지
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• 제12권6호
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• pp.539-547
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• 2008

본 논문에서는 연구용 ADS-B/TIS-B Validation Testbed(AVT)설계를 위한 기초 결과에 대하여 살펴본다. ADS-B는 GNSS와 디지털 데리터링크를 활용한 새로운 항공감시 개념이다. ADS-B는 종속적인 감시 개념이기 때문에 ADS-B송수신기를 장착하지 않은 항공기에 대한 감시 정보는 획득이 불가능하다. 기존의 이차감시레이더를 사용하여 획득한 감시정보를 제공하는 개념이 AIS-B이다. AVT는 ADS-B 및 ATS-B 개념을 기반으로 한 차세대 위성항행시스템의 감시 플랫폼이라는 의의가 있다.

• Journal of Information Processing Systems
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• 제12권4호
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• pp.688-710
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• 2016

Our approach permits to capitalize the expert's knowledge as business rules by using an agent-based platform. The objective of our approach is to allow experts to manage the daily evolutions of business domains without having to use a technician, and to allow them to be implied, and to participate in the development of the application to accomplish the daily tasks of their work. Therefore, the manipulation of an expert's knowledge generates the need for information security and other associated technologies. The notion of cryptography has emerged as a basic concept in business rules modeling. The purpose of this paper is to present a cryptographic algorithm based approach to integrate the security aspect in business rules modeling. We propose integrating an agent-based approach in the framework. This solution utilizes a security agent with domain ontology. This agent applies an encryption/decryption algorithm to allow for the confidentiality, authenticity, and integrity of the most important rules. To increase the security of these rules, we used hybrid cryptography in order to take advantage of symmetric and asymmetric algorithms. We performed some experiments to find the best encryption algorithm, which provides improvement in terms of response time, space memory, and security.

• 정보관리연구
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• 제39권3호
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• pp.143-161
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• 2008

현대인의 바쁜 일상은 원하는 정보를 즉시 획득하고자 하는 소비자의 요구를 증대시키고 있고, 정보서비스 제공자의 입장에서도 언제, 어디서나 이용할 수 있는 서비스 환경의 제공은 정보서비스의 가치를 높일 수 있는 중요한 요소가 되었다. 이렇게 시간, 공간의 제약을 뛰어넘는 정보요구를 만족시키기 위한 궁극적인 대안으로 모바일 정보서비스에 대한 수요와 공급이 증가하고 있다. 본 고에서는 이동통신망과 이동통신용 단말기를 정보전달의 매개로 삼아 정보서비스를 제공하기 위한 시스템 구축과 서비스 제공 문제를 살펴보았다. 먼저 모바일 환경에서 제공되고 있는 정보서비스 제반 환경을 살펴보았고, 정보서비스를 제공하기 위한 시스템 구축시 기본적으로 필요로 하는 콘텐트, 네트워크, 플랫폼, 이용환경 등의 제반 구성요소를 실무적인 관점에서 고찰하였다.

• 센서학회지
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• 제21권1호
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• pp.46-52
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• 2012

The rapid water pollution in stream, river, lake and sea in recent years raises an urgent need for continuous monitoring and policymaking to conserve the global clean environment. In particular, the increasing water pollution in coastal marine areas adds to the importance of the environmental monitoring systems. In this paper, the mobile server is designed to gathers information of the water quality at coastal areas. The obtained data by the server is transmitted from field servers to the base station via multi-hop communication in wireless sensor network. The information collected includes dissolved oxygen(DO), hydrogen ion exponent(pH), temperature, etc. By the information provided the real-time monitoring of water quality at the coastal marine area. In addition, wireless sensor network-based flooding routing protocol was designed and used to transfer the measured water quality information efficiently. Telosb sensor node is programmed using nesC language in TinyOS platform for small scale wireless sensor network monitoring from a remote server.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권2호
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• pp.529-546
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• 2012

To address the need for autonomous control of remote and distributed mobile systems, Machine-to-Machine (M2M) communications are rapidly gaining attention from both academia and industry. M2M communications have recently been deployed in smart grid, home networking, health care, and vehicular networking environments. This paper focuses on M2M communications in the vehicular networking context and investigates areas where M2M principles can improve vehicular networking. Since connected vehicles are essentially a network of machines that are communicating, preferably autonomously, vehicular networks can benefit a lot from M2M communications support. The M2M paradigm enhances vehicular networking by supporting large-scale deployment of devices, cross-platform networking, autonomous monitoring and control, visualization of the system and measurements, and security. We also present some of the challenges that still need to be addressed to fully enable M2M support in the vehicular networking environment. Of these, component standardization and data security management are considered to be the most significant challenges.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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• pp.149-152
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• 1998

Nowadays, GIS, as multi-discipline information system, is closely linked with GPS application in conjunction with GIS-T or Logistics GIS. With this R&D trend. CPS/GIS application system for AVL is newly developed in this study. This AVL is designed and implemented by using pure Java computing technology towards com ing Car-equipped wireless Internet PC age, and main features of Java are included at this system: Platform independence, Multi-thread processing, and Object-oriented paradigm. While, because core modules of this AVL are based on GIS spatial engine, unlike other commercial AVLs, large spatial database problem handling digital image/spatial information and attribute information and direct access problem of GIS data is easily dealt with. this system can directly access external database by using JDBC: MS Access for desktop version and Oracle for W/S version. Finally, it is thought that Java-based AVL, one of CPS/CIS applications, can be easily extended into other prospective GIS applications: Land surveyor supporting system, Flight tracking system, 3D facility management system with CPS, and so forth.

• 정보관리연구
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• 제40권2호
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• pp.117-134
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• 2009

상당수 대학은 자체 방송국을 운용하고 있다. 방송의 내용도 다양해져 학내 영상서비스를 제공하는 대학도 다수에 이른다. 본 고에서는 이러한 환경을 반영하여 효율적인 학내 방송서비스를 제공하기 위한 솔루션으로 멀티캐스트 서비스의 구현문제를 다루었다. 이를 위해 멀티캐스트 서비스의 개념과 특징을 살펴보았다. 또한 서비스의 시나리오, 플랫폼, 주요 기능 등 구현된 서비스를 서울 소재 S대학의 사례를 중심으로 살펴보았다. 본 고에서 소개된 내용을 기반으로 하여 학내 효율적인 방송서비스를 구축, 운영하는 실무에 도움을 줄 수 있기를 기대한다. 본 고에서 소개된 멀티캐스트 서비스는 대학뿐아니라 일반 기업 및 협회 등 다양한 조직에서 활용될 수 있을 것으로 기대한다.

• 한국콘텐츠학회논문지
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• 제8권8호
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• pp.28-36
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• 2008

주파수 자원 가치는 무선통신의 발전과 함께 더욱 커지고 있다. 하지만 앞으로 정보화 사회에서는 주파수 자원의 수요가 공급에 비하여 매우 많기 때문에 주파수 부족 현상이 심각하게 대두된다. 따라서 사용되지 않고 있는 주파수 자원을 효율적으로 이용하기 위한 기술로서 최근 각광을 받고 있는 Cognitive Radio(CR) 기술이 필요한 시점이다. 본 논문은 임베디드 보드에서 CR 기반의 효율적인 Spectrum Sensing 기법을 적용하였다. 현재 이론적으로 제시되어 있는 여러 Spectrum Sensing 기법들에 대해 살펴보고 이 기법들을 CR 환경이 구현된 임베디드 플랫폼에 적용시켜 MAC 메시지를 통해 성능을 검증하였다.

• Journal of Information Technology Applications and Management
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• 제24권4호
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• pp.187-196
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• 2017

It is urgent to prepare countermeasures for traffic congestion problems of Korea's metropolitan area where central functions such as economic, social, cultural, and education are excessively concentrated. Most users of public transportation in metropolitan areas including Seoul use the traffic cards. If various information is extracted from traffic big data produced by the traffic cards, they can provide basic data for transport policies, land usages, or facility plans. Therefore, in this study, we extract valuable information such as the subway passengers' frequent travel patterns from the big traffic data provided by the Seoul Metropolitan Government Big Data Campus. For this, we use a Hadoop (High-Availability Distributed Object-Oriented Platform) to preprocess the big data and store it into a Mongo database in order to analyze it by a sequential pattern data mining technique. Since we analysis the actual big data, that is, the traffic cards' data provided by the Seoul Metropolitan Government Big Data Campus, the analyzed results can be used as an important referenced data when the Seoul government makes a plan about the metropolitan traffic policies.