• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2006.11a
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• pp.123-126
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• 2006

본 논문은 자율주행차량과 로봇의 안내를 위한 자계위치인식시스템을 제안한다. 자계위치인식시스템은 자성체로부터 발생되는 자계를 측정하여 위치를 인식한다. 이러한 자계위치인식시스템에서 지구자계는 기본적인 왜란으로 작용한다. 본 논문에서는 지구자계의 영향을 제거하기 위해서 다수의 1축 자계센서 열을 구성하였으며, 자계센서 출력의 선형구간을 이용하여 정밀한 위치인식시스템을 개발하였다. 본 논문에서 제안하는 자계위치인식시스템은 실험을 통하여 그 실용성을 검증하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.664-666
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• 2022

현재 중고거래 시장은 빠르게 성장하고 있으며, 중고물품 거래는 쓰지 않는 물건을 나눠 쓰고 재사용하는 중고거래 문화로 하나의 지역 생활 트렌드로 자리 잡고 있다. 이에 따른 가장 큰 이점은 환경보호와 자원의 재활용이다. 따라서 본 연구는 사용자의 밀집도가 높은 대학교를 공략하여 중고거래를 활성화하려 한다. 편의성과 실용성 있는 서비스를 제공하기 위하여 파이어베이스와 T-map을 기반으로 안드로이드 프레임워크에서 사용하여 구현하였다. 본 애플리케이션의 주 서비스는 중고물품 거래, 실시간 채팅 그리고 위치 기반 서비스이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.253-256
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• 2008

아직도 많은 프로젝트에서 지속적으로 변화하는 요구사항과 불가능한 납기일정 그리고 품질을 무조건 만족해야 하는 상황에 많은 개발자들이 괴로워하고 있다. 또한 최근 들어 프로젝트들이 그 개발의 방법으로 컴포넌트 기반 개발(CBD)를 많이 사용하고 있다. 이러한 상황에서 재사용성을 강조하는 품질 좋은 컴포넌트를 식별하고, 개발하기란 매우 어렵다. 또한 기존의 CBD 개발 방법의 프로세스가 요구사항을 초기에 고정하고, 그 기반 위에 여러 단계를 거치기 때문에, 납기기간이 짧거나, 요구사항이 고정되지 않았을 경우 많은 어려움에 직면하고 있다. 본 논문에서는 요구사항이 불명확하고, 납기일정이 짧은 프로젝트에서 유용하도록, 작은 단위의 반복과 그 피드백을 통해, 고객의 요구사항 변경에 빠르게 반응할 수 있고, 기존의 컴포넌트 개발 방법을 단순화한 기민한 컴포넌트 개발 프로세스를 제시한다. 이러한 제안된 기법의 실용성을 검증하기 위해 기존 식별 방법과의 비교, 평가를 제시한다.

• Journal of the Korea Institute of Building Construction
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• v.15 no.1
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• pp.1-7
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• 2015

The objective of this study is to develop a high-performance foamed concrete made with a new mixture proportioning as an alternative of autoclaved lightweight concrete (ALC) block. For the early-strength gain of the foamed concrete under an atmospheric curing condition, the binders and chemical agents were specially contrived as follows: 3% anhydrous gypsum was added to ordinary portland cement (OPC) in which $3CaO{\cdot}SiO_2$ content was controlled to be above 60%; and the content of polyethylene glycol alkylether in a polycarboxylate-based water-reducing agent was modified to be 28%. Using these binders and chemical agents, 11 mixes were prepared with the parameters of W/B ratio (30% to 20% in a interval of 2.5%) and unit binder content ($400kg/m^3$ to $650kg/m^3$ in a interval of $50kg/m^3$). The quality and availability of the mixed foamed concrete were examined according to the minimum requirements specified in the KS for ALC block and existed conventional foamed concrete. The measured properties satisfied the minimum requirement of KS for ALC block and proved that the developed high-performance foamed concrete had considerable potential for practical application.

• Journal of Sericultural and Entomological Science
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• v.9
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• pp.43-47
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• 1969

This experiment was carried out to investigate the effect of gamma ray on the eggs of later stage in late fall rearing season. The results are summarized as follows: 1. The duration of larval stage was simmilar to that of control in any dose. The silkworm growth was uniform in does of 4,000 gamma ray, but in does of 8,000r 16000r was irregular. There were not malformed silkworms but many small silkworm. 2. Mortality of silkworms was very high 8,000r and over; virus diseases of 87.6 per cent, flacherie of 5.9 per cent and complication of 6.5 per cent. 3. The more the dose of gamma ray became, the lighter the weight full grown silkworm and matured silkworm became. 4. The uniformness of cocoons was registered in dose of 2,000r and the cocoons were irregular or small in dose of 16,000r

• The Journal of the Korea Contents Association
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• v.20 no.8
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• pp.186-198
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• 2020

The current study examines how product type and attitudes toward the webtoon - a digital comic that originated in Korea - affect consumer responses to webtoon product placement (PPL). Specifically, it examines the following responses: the perception of PPL intrusiveness, attitudes toward the PPL, attitudes toward the brand, word-of-mouth intention, and purchase intention. It further investigates how PPL type interacts with product type and attitudes toward the webtoon on consumer responses to the PPL. The findings from a 2 (product type: functional vs. hedonic) × 2 (attitudes toward the webtoon: negative vs. positive) × 2 (PPL type: creative placement vs. on-set placement) between-subject experimental study suggest the following: consumer responses to PPL in webtoon is more positive when the product is hedonic (vs. functional) and when attitudes toward the webtoon are positive (vs. negative). This study further suggests when subjects felt favorably toward the webtoon, the creative placement produced weaker perceptions of PPL intrusiveness and more favorable attitudes toward the PPL than the on-set placement. On the other hand, when subjects felt negatively toward the webtoon, the on-set placement evoked weaker perceptions of intrusiveness and more favorable attitudes toward the PPL than did the creative placement.

• Water for future
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• v.26 no.1
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• pp.63-69
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• 1993

Remediation technology becomes an issue in environmental engineering. The vibro-recovery technique is one of popular means to remove pollutants from contaminated soils and groundwater. Using Ultrasonic excitation in soil-fluid medium, it was found that removal efficiency in a mechanical effects was significant. In this paper, therefore, laboratory experiments were conducted on clayey sand soil columns using a probe-type ultrasonic processor. Ultrasonic treatment with simultaneous pumping enhances dislodgement of clay particles, and ultrasonic excitation reduced the proportions of finer particles and thus result in increased hydraulic conductivity significantly. Also, the results provided the changes in grain size distribution curve of the soil due to ultrasonic excitation. The results indicated that the maximum size of particles mobilized by Ultrasonic is about 0.004mm and particles in the size range from 0.04mm to 1.0mm were subjected to fracturing. The economic feasibility of Ultrasonic implementation is considered in power requirement of the generator and maintenance of the horn. At a specified amplitude of vibrations, the power requirement of the generator depends on overburden pressure of the horn, temperature and viscosity of fluid in the soil medium. For comparisons, the requirement of a one inch and two inch diameter horn sonicators are compared with the power required for pumping water from different depths.

• Journal of KIISE:Software and Applications
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• v.34 no.12
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• pp.1011-1020
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• 2007

It is difficult to assemble independently developed software components because of discrepancies between their interfaces. In order to resolve such problem, we propose a new component model, Active Binding Technology, in which each component has its own independently-defined interface for service request that is revealed in its metadata, instead of passively following the interface of a service-providing component. This model Includes the use of the glue component, an interface mediating place, whose template code is automatically generated by reading in the metadata of the components to be combined. We also propose a runtime framework that holds the pool of component instances, completes the assembly of components in the manner of dependency injection, and performs middleware services and real-time system monitoring through glue components. In order to test the practical value of Active Binding Technology, we have made a tool, which supports the development and assembly of Active Binding components.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.6
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• pp.397-405
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• 2014

Software-Defined Networking (SDN), which separates the control plane from the data plane and manages data planes in a centralized way, is now considered as a future networking technology, and many researchers and practitioners have dived into this area to devise new network applications, such new routing methods. Likewise, network security applications could be redesigned with SDN, and some pioneers have proposed several interesting network security applications with SDN. However, most approaches have just reimplemented some well-known network security applications, although SDN provides many interesting features, They didn't effectively use them. To investigate if we can use SDN in realizing sophisticated network security applications, we have designed and implemented an advanced network security application, Reflectornet, which redirects malicious or suspicious network trials to other security monitoring points (e.g., honeypot). In addition, we have tested its performance and practicability in diverse angles. Our findings and some insights will encourage other researchers to design better or intelligent network security applications with SDN.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.7
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• pp.616-622
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• 2012

In this paper, we examined the problems of the flare operation of tactic maneuvering flight of fighter aircraft with 150GL center external fuel tank and proposed the possible solution of it's operation. The damage scope of horizontal fin of fuel tank and flare trajectory when the flare ejected from the maneuvering aircraft were analyzed by the wind tunnel test and the numerical analysis. We investigated the two different option to avoid the damage of fin; i) the adjustment of flare dispenser angle and ii) the change of horizontal fin's shape. For the considering of practical operation of present system, we chose the second option. We estimated the drop safety of external fuel tank with redesigned fin by the wind tunnel experiments.