• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.392-392
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• 2023

통합수자원관리 IWRM(Integrated Water Resources Management)를 위한 다각도의 연구가 진행되고 있다. 구축된 정보의 활용 증진, 정책적 측면 등이 어우러져 고려되어야 비로소 통합으로서의 가치가 확보될 것이다. 본 고에서는 그중 데이터 측면을 살펴본다. 데이터 관점에서도 정보의 수집, 유통, 품질 등 여러 관점의 주제가 존재한다. 예를 들어 유통을 위한 메타데이터는 ISO 19139의 채택에서 추가 보완할 부분이 무엇인지, 유통을 위한 포맷과 인터페이스는 XML과 OGC WFS를 채택시 충분한 호환성이 확보되는지 등 이 주요한 검토요소가 될 것이다. 본 고에서는 이러한 고민에 앞서, 초기 절차인 시스템 적재 과정의 ETL(Extract, Transform and Load)과 ELT(Extract, Load and Transform) 방법을 비교하고자 한다. 수자원 분야 데이터를 사용한 예시 사례를 통하여, 최근 데이터 산업 분야에서 ETL과 ELT 차이가 이슈화되고 있는 이유를 살펴보고, 온프레미스와 클라우드 상황에 대하여 두 가지 방법의 장단점을 비교함으로서 다양한 데이터를 직면하게 되는 IWRM에서의 데이터 적응에 대한 힌트를 얻고자 한다. 기본적으로는 ETL보다 ELT의 효율성이 높을 것으로 전망된다. 그러나 해당 변환 과정이 일회성인지 반복적인지 고려해야 한다. 또한 변환에 있어 지배적인 요소가 변환 프로세스의 복잡도인지, 레코드 건수인지도 유불리에 영향을 준다. 비용측면에서는 ETL보다 ELT의 저장 비용이 증가할 수 있고, 이는 온프레미스 DBMS에서 PaaS 유형의 DBMS로 전환되어감에 따라 더 큰 부담이 될 수 있다. 무엇보다 ETL, ELT에서는 요구되는 변환 기술의 종류가 다르다. 예를 들어 Desktop GIS 도구와 ANSI 표준 SQL 기술로 대표될 수 있으며 각 수행조직에서는 보유 인적자원의 기술 현황과 학습곡선 등을 고려해야 한다. 결론적으로 ETL, ELT의 비교에 있어서는 처리시간과 동시에, 비용과 인적 자원 그리고 전략적 측면도 함께 검토되어야 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.40-42
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• 2011

Smart hand-held devices like iPhone, iPad, Andriod and other mobile-OS machines are becoming a well known part of our daily lives. Utilization of these devices has gone beyond the expectations of their inventors. Evolution of Apple's iOS from a mobile phone Operating System to a wholesome platform for Portable Gaming is an adequate proof. Using these smart devices people are downloading applications from numerous online App Stores. Utilizing remote storage facilities and confining themselves to computing power far below than an entry level laptop, netbooks have emerged. Google's idea of Chrome OS coupled with Google's AppEngine is an eye-opener for researchers and developers. Keeping all these industry-proven innovations in mind we are proposing a Context-Driven Cloud-Oriented Application Architecture for smart devices. This architecture enables our smart devices to behave smarter by utilizing very less of local resources.

• Proceedings of the KIEE Conference
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• 1997.07d
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• pp.1552-1554
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• 1997

In this paper, thin films of PI were fabricated VDPM of dry processes which are easy to control the film's thickness and hard to pollute due to volatile solvents. From FT-IR, PAA thin films fabricated by VDP were changed to PI thin films by thermal curing. From AFM and ellipsometer experimental, the higher curing temperature is, the films thickness decreases and reflectance increases. Therefore, PI could be fabricated stable by increasing curing temperature.

• Journal of Applied Biological Chemistry
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• v.42 no.4
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• pp.197-201
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• 1999

Antagonistic bacteria active against phytopathogenic fungi, Phytophthora capsici, Pythium ultimum, Rhizoctonia solani, Botrytis cinerea, and Fusarium oxysporum were isolated from greenhouse soils. An antifungal compound was extracted by ethyl acetate from acidified culture filtrate and purified through column chromatography and thin layer chromatography. Activity-guided bioassay was followed throughout the purification steps using Pythium ultimum as a test organism. The purified antifungal compound was identified as phenylacetic acid (PAA) based on the data obtained from IR, EI/MS, $^1H-NMR$, and $^{13}C-NMR$. Two different isolates, which had vast differences in differential characteristics except 16S rDNA sequence homology, produced the same compound, phenylacetic acid. $ED_{50}$ values of the phenylacetic acid against P. ultimum, P. capsici, R. solani, B. cinerea, and F. oxysporum were 45, 21, 318, 360, and 226 ppm, respectively.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1994.05a
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• pp.99-102
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• 1994

The use of preformed polymers and their cross-linking have been a attempted in order to improve the intrinsic fraqility of monolayers and Langmuir-Blodgett (LB)films and to make their technological applications possible. It has shown that an imidization followed a polyion-complexation can stabilize the LB films against heat and solvents. And when the polymer structure was properly designed concurrent removal of the alkyl tails together with imide formation could be accomplished. In this paper we present a characteristic monolayer behavior of polymer with pendent polythers and carboxyls it’s polyion-complexed LB film with subphase polymer PAA and a possible skeletonization of the LB film by thermal imidization. Also deposition status of LB films are evaluated by using QCM

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.850-853
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• 2014

다양한 단말의 발달과 네트워크 대역폭 확대, 고화질의 컨텐츠 등장 등의 기술 발전으로 인해 클라우드 기반에서 사용자 및 사업자 영상을 서비스하는 시스템을 구축하는 것이 중요해 졌다. 본 연구에서는 고화질의 영상을 기존의 TV 에서 제공하는 것뿐만 아니라 모바일 및 PC 에서도 동시에 이용할 수 있는 클라우드 기반의 미디어 서비스 제공 시스템을 설계, 구현한다. 클라우드 기반의 미디어 서비스를 위하여 다양한 환경에서 사용자 및 사업자의 영상을 이용할 수 있도록 미디어 처리를 위한 기능을 제공하는 클라우드 기반 미디어 시스템을 개발한다. 또한 다양한 포맷의 영상을 처리하고, 이 영상을 등록, 관리, 배포, 제공 할 수 있는 기능도 구현한다. 다양한 미디어 및 단말을 동시에 제공하기 위해 시스템은 현재의 클라우드 환경을 고려하여 개발되고 있으며, 추후 다양한 클라우드 환경에서 동시에 서비스를 확장할 수 있도록 인터-클라우드 방안을 지원한다. 또한 이 클라우드 기반의 미디어 서비스를 기반으로 새로운 사업자 서비스를 추가 구현하고, 이를 상용으로 서비스하는 PaaS 형식의 서비스 플랫폼 기능도 제공한다.

• KIPS Transactions on Software and Data Engineering
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• v.1 no.1
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• pp.19-30
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• 2012

The context aware service is the service to provide useful information to the users by recognizing surroundings around people who receive the service via computer based on computing and communication, and by conducting self-decision. But CAS(Context Awareness System) shows the weak point of small-scale context awareness processing capacity due to restricted mobile function under the current mobile environment, memory space, and inference cost increment. In this paper, we propose a mobile cloud context system with using Google App Engine based on PaaS(Platform as a Service) in order to get context service in various mobile devices without any subordination to any specific platform. Inference design method of the proposed system makes use of knowledge-based framework with semantic inference that is presented by SWRL rule and OWL ontology and Jess with rule-based inference engine. As well as, it is intended to shorten the context service reasoning time with mapping the regular reasoning of SWRL to Jess reasoning engine by connecting the values such as Class, Property and Individual which are regular information in the form of SWRL to Jess reasoning engine via JessTab plug-in in order to overcome the demerit of queries reasoning method of SparQL in semantic search which is a previous reasoning method.

• Proceedings of the KIEE Conference
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• 1998.07d
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• pp.1487-1489
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• 1998

In this paper, thin films of PI were fabricated VDPM of dry processes which are easy to control the film's thickness and hard to pollute due to volatile solvents. From FT-lR, PAA thin films fabricated by VDP were changed to PI thin films by thermal curing. From SEM, AFM and Ellipsometer experimental, as the higher curing temperatures the films thickness decreases and reflectance increases. Therefore, Pl could be fabricated stable by increasing curing temperature. The relative permitivity and dissipation loss factor were 3.7 and 0.008. Also, the resistivity was about $1.05{\times}10^{15}{\Omega}cm$ at $30^{\circ}C$.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.6
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• pp.151-156
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• 2011

The Korean domestic cloud market will reach a value of 2 trillion Korean won by 2014. The domestic market is expected to grow rapidly in size despite the fact that there exist activation barriers in mobile cloud services, concerns about the reliability of service, and concerns about security and confidentiality of data. Under these circumstances, existing IT security technologies may be be utilized to provide sufficient response characteristics. Despite this, they must be optimized for mobile cloud computing and enhanced to mitigate inherent security flaws. In this study, mobile cloud security is covered along with use cases that cover the cases where mobile devices are particularly vulnerable and suggest ways to mitigate security vulnerabilities.

• Journal of KIBIM
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• v.13 no.4
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• pp.54-63
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• 2023

In recent years, the mandatory use of BIM has been actively promoted due to the digital transformation of the construction industry. However, the CDE (Common Data Environment) system, which is an essential element for operating BIM, has not been established in accordance with the domestic situation. To solve this problem, this study analyzed the results of previous studies, including the ISO 19650 standard and domestic CDE system requirements, and developed BIM-based collaboration functions that are suitable for the domestic construction industry through functional analysis of domestic and foreign commercial CDE solutions. And we developed a BIM collaboration framework to provide BIM-based collaboration functions as a service by using cloud technologies such as IaaS, PaaS, and SaaS to provide infrastructure resources flexibly and flexibly. The BIM collaboration framework developed in this study meets most of the CDE requirements of ISO1965, so it can secure competitiveness when bidding for overseas BIM projects. Also, because the BIM collaboration functions can be selectively applied to build a BIM-based collaboration platform, it is expected that the utilization of the BIM collaboration framework will be high, as it can minimize not only the time to build the platform but also the operating costs, and the usability is higher than that of existing commercial BIM CDE solutions.