• Journal of The Korean Astronomical Society
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• v.52 no.5
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• pp.145-158
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• 2019

We conducted a survey of open clusters within 1 kpc from the Sun using the astrometric and photometric data of the Gaia Data Release 2. We found 655 cluster candidates by visual inspection of the stellar distributions in proper motion space and spatial distributions in l - b space. All of the 655 cluster candidates have a well defined main-sequence except for two candidates if we consider that the main sequence of very young clusters is somewhat broad due to differential extinction. Cross-matching of our 653 open clusters with known open clusters in various catalogs resulted in 207 new open clusters. We present the physical properties of the newly discovered open clusters. The majority of the newly discovered open clusters are of young to intermediate age and have less than ~50 member stars.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.42 no.4
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• pp.904-914
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• 2017

For efficient energy usage, the concept of demand response has been emerged and thereby Open Automated D emand Response(OpenADR) protocol is developed as a standard protocol to provide automated demand response. There have been emerging trends on the demand response services using the Internet of Things(IoT) for smart h ome energy management. In this smart home energy IoT environment, a lightweight protocol is needed rather tha n the existing HTTP/ XML based OpenADR protocol for demand response services since many small devices wi ll be interconnected. In this paper, we propose a lightweight OpenADR protocol based on CoAP protocol for pro viding demand response service in Smart Energy IoT environment, implement the proposed CoAP-based protocol, and analyzed the performance compared to existing HTTP/ XML-based OpenADR 2.0b protocol.

• IEIE Transactions on Smart Processing and Computing
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• v.6 no.1
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• pp.60-65
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• 2017

Network virtualization enables us to make efficient use of resources in a physical network by embedding multiple virtual networks in the physical network. In this paper, we develop a prototype of a virtual network embedding system. Our system consists of OpenStack, which is an open source cloud service platform, and shell scripts. Because OpenStack does not provide a quality of service control function, we realize bandwidth reservation for virtual links by making use of the ingress policing function of Open vSwitch, which is a virtual switch used in OpenStack. The shell scripts in our system automatically construct the required virtual network on the physical network using the OpenStack command-line interface, and they reserve bandwidth for virtual links using the Open vSwitch command. Experimental evaluation confirms that our system constructs the requested virtual network and appropriately allocates node and link resources to it.

• Journal of Information Science Theory and Practice
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• v.1 no.3
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• pp.47-59
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• 2013

The present study aims to assess the growth of open access journals at a global level. The concept of Open Access (OA) publishing is being well received among academic circles and as a result we can see more and more scholarly content is being made these days available in open access format. The present study is simply an attempt to assess the trend and growth of open access journals during the last decade, viz. for the period 2003-2012, for which data has been retrieved from the Directory of Open Access Journals (DOAJ), which as of date hosts more than 9700 journals from 120 countries across the world covering major languages of the world. But keeping in view the period of our study the data has been retrieved as per our applicability, which as a result confines our study to 8453 journals only. The directory covers 18 main subject areas having 76 sub-disciplines, each having on average 118.53 journals. During the entire decade the number of countries which entered into OA publishing rose from 49 to 120 with a growth of 144%, and if this growth rate continues to be the same for the next five years, viz. by 2018, the world will turn into 100% open access. At the continental level Europe leads the tally by publishing a maximum of 3140 OA journals contributed by 43 countries across Europe, which again is the highest number from any continent.

• Journal of Korean Elementary Science Education
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• v.30 no.2
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• pp.242-254
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• 2011

The purpose of this study was to understand the teaching effects according to the cognitive levels after conducting inquiry activities using science notebooks in the open inquiry activities of the elementary science class. The results of this study were as follow. first, students having the open inquiry activities using science notebooks showed improvement in scientific inquiry abilities in both groups with the low and high cognitive level. Second, regarding the changes of scientific attitudes, both groups with the low and high cognitive level exhibited improvement. According to the result of analyzing interaction between the cognitive level and class treatment on the effects for scientific inquiry abilities and scientific attitudes, there was no difference by the cognitive level. And the use of science notebooks in open inquiry activities had effects on improving scientific inquiry abilities and scientific attitudes regardless of the cognitive level.

• Proceedings of the Korean Society of Crop Science Conference
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• 2004.04a
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• pp.170-171
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• 2004

• Proceedings of the Korean Society of Crop Science Conference
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• 2004.04a
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• pp.172-173
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• 2004

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1381-1384
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• 2009

인터넷 인구가 크게 증가함에 따라 인터넷 상의 ID와 개인정보 관리 문제가 크게 대두되고 있다. 이에 대한 해결책으로 통합 ID 관리 시스템이 고안되었으며 이 방법들 중 하나로 사용자 중심의 분산형 인증을 제공하는 OpenID가 있다. 현재 OpenID는 보안적인 기능을 담당하는 신뢰모델에 대한 표준화가 되어있지 않기 때문에 ID와 Password 이외에 사용자를 인증하는 다른 방법이 없는 문제점이 있다. 본 논문에서는 OpenID의 인증 및 신뢰성을 강화하기 위해 OTP 생성 매체인 Mobile One Time Password를 적용한 OpenID기반의 MOTP를 이용한 사용자 인증 시스템을 제안하고 설계한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1393-1396
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• 2009

인터넷 서비스를 사용하기 위해서 사용자들은 이름과 주민등록번호로 실명 인증을 받은 후에 ID를 부여 받았으나, 최근 보안상 문제로 주민등록번호 대체 수단인 I-PIN 서비스를 사용하고 있다. 그리고 하나의 ID로 통합하여 인터넷 서비스를 받을 수 있는 OpenID 서비스가 국내에서도 시행중이지만 사용자 인증이 없어 악성 댓글과 스팸 등으로 악용될 수 있다. 본 논문에서는 OpenID에서 회원가입을 할 때 I-PIN을 사용하여 사용자 인증을 하는 기법을 제안하고 기존의 OpenID와 I-PIN을 적용한 OpenID를 비교분석을 통하여 보안적인 측면이 강화된 것을 확인할 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.35-39
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• 2007

OpenID는 웹 서비스를 위한 사용자 중심의 분산형 인증 메커니즘을 제공한다. OpenID를 이용하면 기존의 아이디와 패스워드를 이용한 인증방법보다 더 편리한 회원등록과 로그인 기능을 제공 할 수 있다. 본 논문에서는 OpenID를 이용하여 모바일 웹 환경에서의 사용자 인증 메커니즘을 설계한다. 먼저, 이동통신 망과 무선인터넷에서의 사용자 인증기술에 대해서 분석하고, OpenID를 이용한 개선된 모바일 웹 사용자 인증 메커니즘을 제안한다. 제안하는 메커니즘의 목표는 모바일 웹 사용자에게는 보다 효율적인 회원등록과 로그인 기능을 제공하고, 모바일 웹 서비스 제공자에게는 좀 더 신뢰성 있는 사용자 인증 수단을 제공하는 데 있다.