• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.203-204
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• 2013

분산되어 있는 컴퓨팅 자원을 가상화시킨 이후 접근하여 사용하는 클라우드 컴퓨팅은 인터넷의 발전과 대규모의 데이터센터를 지니는 IT 기업의 등장으로 그 모습을 드러내게 되었다. 복잡도가 높은 다중 클라우드 환경에서 클라우드 브로커(CSB)는 클라우드 사용자(CSC)와 클라우드 제공자(CSP)를 중개하여 최적의 가상 머신(VM) 배치를 할 수 있도록 한다. CSB의 과제는 가장 좋은 성능을 보이며 동시에 가장 경제적인 VM들을 다른 CSP들로부터 제공받아 CSC가 사용할 수 있도록 하는 것이다. 본 논문에서는 초기 VM 배치를 위해 CSC에서 요구하는 자원의 양을 예측하는 기법들을 소개하고, 관련된 미래 기술의 발전 방향에 대해 논의하고자 한다.

• The Bulletin of The Korean Astronomical Society
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• v.46 no.2
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• pp.62.3-63
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• 2021

남한과 북한의 천문 R&D 이슈와 협력 방안에 대해 연구하였다. 지난 2015년 과기부 남북과학기술 및 학술협력사업 '남북한 천문분야 활성화 및 협력방안 연구'를 계기로 북한의 천문연구 현황, 천문관측장비, 인력, 발행물, 책자 등의 자료를 수집하고 정리하였다. 이 자료들은 통일부 북한자료센터와 한국과학기술정보연구원 NK Tech에서 소장한 데이터들, 북한출판사 발행 간행물, 중국국가천문대, 네덜란드 레이덴 대학에서 보유한 북한 천문 관련 자료, 조선중앙통신과 노동신문과 같은 북한 언론매체 기사, 미국, 캐나다, 독일의 언론에 소개된 기사, 그리고 인터넷을 통해 수집한 자료들이다. 이 자료들을 통해 북한의 천문연구 현황을 이해하고 R&D 이슈는 무엇인지 살펴보려 한다. 또한, 정부와 과학계에서 진행되고 있는 남북한 연구 협력 노력에 대해서도 논의하려 한다. 이를 통해 북한의 천문연구 현황을 이해하고 남북천문협력 방안에 대해서도 제안하려 한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.05a
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• pp.169-170
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• 2023

사물인터넷(loT), 인공지능, 빅데이터 등 빠르게 발전하는 기술을 기반으로 개발 중인 자율운항선박(MASS)의 개발이 유럽(독일, 노르웨이, 스웨덴, 독일, 노르웨이 등), 미국, 일본, 중국 등 다양한 나라에서 이루어지고 있다. 산업통산자원부는 2022년 11월 3일 자율운항에 필요한 항해·기관 자동화 시스템 등의 핵실기술 개발과 자율운항 해상 시험선 실증을 수행하는 자율운항선박 성능실증센터를 준공하여 미래 해운산업에 박차를 가하고 있다. 해양주권 수호, 수색·구조, 해상질서유지, 해양범죄예방·수사, 해양오염방제 등 바다에서의 수호자 역할을 수행하는 해양경찰의 변화는 무엇보다 중요하겠다. 이에 국내·외 서적, 연구논문, 보고서, 언론자료 등의 분석을 통해 자율운항선박 등 미래발전에 대한 관심을 가지고, 해양경찰의 개선방안을 논의해 보고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.05a
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• pp.142-146
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• 2014

The mobile computing has been a main mean of computing, because of recent development of smartphone and mobile communication network. The new service technologies, such as cloud computing, big data, SDN (Software Defined Network), and NFV (Network Function Virtualization), are appearing due to activating of the data center. These changes have brought various requirements for transport layer protocol. In addition, the transport protocol should have a extensible function to adapt additional technologies. This paper proposed that transport layer divide into three layer structure for extensible function, and designed the ETP(Extensible Transport Protocol) which is located in the bottom layer.

• Journal of Korean Library and Information Science Society
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• v.39 no.2
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• pp.187-212
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• 2008

Many libraries and information centers offer various resources on their web sites and web reference is one of them. However, it can be quite burdensome for individual libraries to build a reliable database while sorting through countless web data. The attempts to build a collaborative database have been also unsuccessful due to heavy workload of librarians and financing problems. This study seeks to propose a UCC(User Created Contents)-based web reference database created by general users including librarians. It is an open reference database where everyone can contribute regardless of their affiliation and library types (for librarians), Also, it requires metadata scheme to standardize web-based references. By setting the initial metadata, it can present a basic guideline for users to post web references.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.1
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• pp.145-151
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• 2017

In this paper, we propose the design and implementation of the system that is predicting the failure of ballast water treatment system by analysing its sensor datum and is reserving the most effective service center for sellecting the repair location on the way to the destination port. These data are collected in real time during draining or filling up the sea water from/to the ship, and it is essential to preliminarily repair the equipment showing unstable characteristics by analyzing the normal and abnormal data characteristics. We proposed a software platform for predicting and repairing faults by selecting the most efficient repair center based on this e-Navigation while the vessel is navigating to the next destination port. This system, as announced by the IMO Convention for the Prevention of Marine Pollution in 2017, provides a stable economic impact from stable cargo operation and stable out/in from/to port and marine ecosystem.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.1
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• pp.77-82
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• 2023

Multi-cloud rendering has been attracting attention recently as the computational load of rendering fluctuates over time and each rendering process can be performed independently. However, it is challenging in multi-cloud rendering to deliver large amounts of input data instantly with consistency constraints. In this paper, we develop a new distributed file system for multi-cloud rendering. In our file system, a local machine maintains a file server that manages versions of rendering input files, and each cloud node maintains a rendering cache manager, which performs distributed cooperative caching by considering file versions. Measurement studies with rendering workloads show that the proposed file system performs better than NFS and the uploading schemes by 745% and 56%, respectively, in terms of I/O throughput and execution time.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.24 no.4
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• pp.177-182
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• 2024

The issue of teenage drinking and smoking has been raised repeatedly over the years. However, for various reasons, adolescents have continued to drink and smoke up to the present. Consequently, various preventive education programs are being implemented in all elementary, middle, and high schools, but these efforts have not been significantly effective in reducing the rates of adolescent drinking and smoking. Furthermore, while youth centers exist in various locations, they are often underutilized due to inadequate promotion or facilities. Given that drinking can lead to serious juvenile crimes, and there are indeed cases to this effect, preventive measures are absolutely necessary. Therefore, this paper analyzes the behavior of adolescents regarding drinking and smoking using public data. Based on the analysis conducted using R, a tool for big data analysis, this paper proposes measures to reduce the rates of adolescent drinking and smoking. The proposed measures focus more on prevention than on post-event solutions.

• Journal of the Korea Society for Simulation
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• v.18 no.1
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• pp.27-34
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• 2009

Currently network users, especially the number of internet users, increase rapidly. Also, high quality of service is required and this requirement results a sudden network traffic increment. As a result, an efficient management system for huge network traffic becomes an important issue. Ontology/data engineering based context awareness using the System Entity Structure (SES) concepts enables network administrators to access traffic data easily and efficiently. The network traffic analysis system, which is studied in this paper, is designed and implemented based on a model and simulation using data engineering methodology to be avaiable in evaluating large network traffic data. Extensible Markup Language (XML) is used for metadata language in this system. The information which is extracted from the network traffic analysis system could be modeled and simulated in Discrete Event Simulation (DEVS) methodology for further works such as post simulation evaluation, web services, and etc.

• Korean Journal of School Psychology
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• v.18 no.2
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• pp.269-290
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• 2021

This study was conducted to examine the moderated mediation effect of self-esteem through internet overdependence on the effect of academic stress on depression and anxiety. Surveys were conducted as part of the 13th wave of the Korea Welfare Panel Study. The survey included academic stress, internet overdependence, depression and anxiety, and self-esteem scales. A total of 383 middle school students completed surveys. Data was analyzed using SPSS 21.0 and SPSS PROCESS Macro. There were three major results. First, internet overdependence partially mediation the effect of academic stress on depression and anxiety. Second, self-esteem moderated the relationship between internet overdependence and depression and anxiety. Third, self-esteem also moderated the mediating effect of academic stress on depression and anxiety through internet overdependence. These results indicate that self-esteem is a protective factor against the negative effects of internet overdependence on mental health and of academic stress on depression and anxiety in middle school students. This paper discusses the implications of these results, this study's limitations, and suggestions for future studies.