• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.151-153
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• 2000

본 논문은 분산 서버 시스템을 위한 Load Balancing Architecture를 제안한다. 이 구조는 기존에 구현된 클라이언트/서버 시스템을 그대로 사용하면서 규모를 확장할 수 있는 특징을 가지고 있다. Load Balancing Service가 동작하기 위해서는 서버의 성능과 구성상태에 대한 정보를 주고받는 것이 필요하다. 이를 위하여 본 논문에서는 Load Balacing Information Transfer Protocol을 제시한다. 본 논문이 제시하는 구조는 DCOM 및 EJB 등의 Component 서버에서도 사용되어서 확장성을 가지게 할 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06c
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• pp.235-237
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• 2006

로봇 소프트웨어와 같이 사용자의 요구사항과 주변 환경의 잦은 변화에 직면하는 소프트웨어는 스스로 문제 상황을 판단하고, 동적으로 문제 상황을 극복할 수 있는 기능을 검색하고 이용할 수 있어야 한다. 이를 위해 본 논문에서는 아키텍처 기반의 로봇 소프트웨어 환경하에서 온톨로지를 이용하여 로봇의 문제 상황 극복을 위한 소프트웨어의 아키텍처를 재구성 전략과 컴포넌트를 모델링하고 이를 이용하여 문제 상황을 해결 할 수 있도록 적합한 컴포넌트를 선택하는 메커니즘을 기술한다.

• Proceedings of the CALSEC Conference
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• 1999.11a
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• pp.665-674
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• 1999

본 발표에서는 다양한 업종과 생산패턴을 지원하는 저가형 고기능 ERP시스템 개발을 목표로 ETRI가 주관이 되어 연구 개발을 진행하고 있는 표준정보시스템(SEA+시스템)에 대해서 간단히 설명하고, 표준정보시스템에서 비즈니스 응용프로그램 모델링 방법과, 이러한 비즈니스 모델링을 바탕으로 저작 및 운영되는 컴포넌트 조립 방식의 응용프로그램 구조에 대하여 알아본다. 또한 실제 이러한 컴포넌트 조립형 비즈니스 응용프로그램의 저작 및 운영을 지원하기 위해 설계된 SEA+시스템에 대하여 알아본다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.679-681
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• 2005

현재의 Web Service를 구성하는 Core Component들은 진정한 Service-Oriented Architecture를 지원하기에는 많은 단점(Keyword 기반 검색, WSDL의 Semantic 부재 등)들을 가진다. 이러한 단점들을 해결하기 위해 SWSA는 OWL-S라는 Framework을 제안하고, 이를 기반으로 학계와 회사에서 활발한 연구가 진행되어 지고 있다. 하지만 Ontology를 생성해주고 관리하는 체계적인 툴이 없는 실정이라 OWL-S는 다양한 분야에서 활용되지 못하는 한계점을 가지고 있다. 그래서 이러한 문제들 해결하기 위해 본 논문은 OWL-S를 쉴게 생성하고 관리해 주는 Semantic Web Services Manager를 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.751-753
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• 2004

PDA에서 사용하는 대부분의 CPU는 실수 연산 구성요소(float computation component)가 없는 정수(integer) CPU를 사용한다. 인공 신경망(neural network)과 같은 실수 연산이 많은 알고리즘은 PDA에서 많은 수행시간을 가진다. 본 논문에서는 이런 단점을 해결하기 위해 무선 랜(LAN)으로 연결된 Client(PDA)/Server(PC) 구조를 이용한 효과적인 문자 추출 시스템을 제안한다. Client(PDA)는 대략적인 문자 추출 결과를 JPEG으로 압축하여 전송속도를 최소화한다. Server(PC)는 Client(PDA)의 결과를 바탕으로 정밀한 문자 영역 추출을 위해, 텍스춰 분류 방법과 연결 성분 분석 방법을 이용한다. 실험에서 제안한 방법은 속도뿐만 아니라 문자 추출에서도 효과적이었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.529-530
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• 2009

웹 브라우저 환경에서 통신 및 화면 갱신 기능을 제공하기 위해서 최근까지 ActiveX를 제공하였다. 하지만 ActiveX 배포에 따른 보안 문제 또는 Spyware 등으로 인한 개인 정보 노출 가능성을 배제할 수 없게 되었다. 따라서 본 논문에서 제안하는 웹 브라우저 환경에서의 통신 모듈 및 화면 갱신 기법을 통해서 ActiveX의 단점을 보완하려 한다. 또한, 여러 분야에서 적용 가능하지만 NMS 원격 감시 모니터링의 시뮬레이션을 통해서 적용 가능성을 검증하였다.

• Journal of Korean Society of Rural Planning
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• v.13 no.3
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• pp.83-90
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• 2007

The purpose of main entrance was to protect the house with the wall and working for the house-gate where people come in and go out. On the other hand, the type of main entrance is changed variously depended on the materials for house and method of construction. Eleven villages in the Chungyang-Gun where the environment of rural villages is well maintained was chosen and researched to make data. These data of visual landscape elements were analysed by using the SPSS 12.0 for Windows. Relations of the visual component elements were analysed by the analysis for frequency and analysis for crosstab. From the above research we could conclude below results. Through review of the pre-researching and researching literatures, 11 types of visual component elements were selected such as the types of the gate, the looking through degree of the gate, the material of the gate, the color of the gate, the plan of the house, the material of the roof, a material of the wall, a color of the wall, the form of the penetration, the area to put, the area of a site, the year of the constructing a building. For the types of the gate, the gate from without the roof has been the most popular since it appeared 41.5%. For the looking through degree of the gate, a complete blockade form has been the most popular since it appeared 63.2%. For the material of the gate, the iron plate has been the most popular since it appeared 32.1%. For the color of the gate, color has been the most popular since it appeared 68.4%. For the plan of the house, 'ㄷ' form has beneath most popular since it appeared 38.3%. For the material of the roof. The Zinc has been the most popular since it appeared 51.9%. For a material of the wall, A cement mortar has been the most popular since it appeared 47.7%. For a color of the wall, Without tile color has hem the most popular since it appeared 67.0%. For the form of the penetration. The plain form has been the most popular since it appeared 54.0%. For tile area of a site, $100m^2{\sim}200m^2$ has been the most popular since it appeared 39.0%. The results of this study can provide to use of indicates four rural-housing reform. From now on, the results look forward to offering the meaning directions for the improvement of rural house gates.

• Wind and Structures
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• v.25 no.1
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• pp.1-24
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• 2017

This paper presents a 1:25 multi-freedom aero-elastic model for a high lighting pole at the Zhoushan stadium. To validate the similarity characteristics of the model, a free vibration test was performed before the formal test. Beat phenomenon was found and eliminated by synthesis of vibration in the X and Y directions, and the damping ratio of the model was identified by the free decay method. The dynamic characteristics of the model were examined and compared with the real structure; the similarity results were favorable. From the test results, the major along-wind dynamic response was the first vibration component. The along-wind wind vibration coefficient was calculated by the China code and Eurocode. When the peak factor equaled 3.5, the coefficient calculated by the China code was close to the experimental result while Eurocode had a slight overestimation of the coefficient. The wind vibration coefficient during typhoon flow was analyzed, and a magnification factor was suggested in typhoon-prone areas. By analyzing the power spectrum of the dynamic cross-wind base shear force, it was found that a second-order vortex-excited resonance existed. The cross-wind response in the test was smaller than Eurocode estimation. The aerodynamic damping ratio was calculated by random decrement technique and the results showed that aerodynamic damping ratios were mostly positive at the design wind speed, which means that the wind-induced galloping phenomenon is predicted not to occur at design wind speeds.

• Journal of the Korean Institute of Landscape Architecture
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• v.30 no.2
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• pp.1-11
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• 2002

The purpose of this study is to investigate landscape image and define elements of difference in visual preference of bridges on the Han River. To do this end, video was used as a media for the evaluation of the landscape image of 16 bridges on the Han River using a Semantic Differential scale. Data is collected by 50 students from Woosuk University, majoring landscape architecture. Final analysis utilized a total of 704 samples of data. Data is analyzed through descriptive statistics, and spatial image is analyzed by factor analysis algorithm Principle component analysis using Varimax method is applied far extraction and factor rotation. T-test is used to find the difference between the bridge type of preference with the data of factor score. Logistic regression is used to select the factors that influences the visual preference among the image factors. The results of this study can be summarized as follows; The image of whole bridges on the Han River is somewhat orderly, sequential and open. The degree of visual preference of unique bridge type is higher than normal but there are some differences in visual preference within the same type of structure. This suggests that the surrounding landscape is one of the important factor for visual preference. Factors covering the image of bridge are found to be 'aesthetic',　'structure','spatial factor', and 'shape'. Total variance is obtained as 60.4%. The aesthetic variables are the most important factor for visual preference and the structural factor presents no significant difference in visual preference between more preferred and less preferred bridges. Since the collapse of Songsu Bridge, we thought the structural factor is very important but the results of this study suggest that it is more important to consider the aesthetic and spatial factors of the bridge to increase the visual preference when planning and designing bridges. Simulations with more detailed data about surroundings should be utilized practical design.

• Journal of Multimedia Information System
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• v.4 no.4
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• pp.195-204
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• 2017

Mobile robots are used for years as a valuable research and educational tool in form of available open-platform designs and Do-It-Yourself kits. Rapid development and costs reduction of Unmanned Air Vehicles (UAV) and ground based mobile robots in recent years allowed researchers to utilize them as an affordable research platform. Despite of recent developments in the area of ground and airborne robotics, only few examples of Unmanned Surface Vehicle (USV) platforms targeted for research purposes can be found. Aim of this paper is to present the development of open-design USV drone with integrated multi-level control hardware architecture. Proposed catamaran - type water surface drone enables direct control over wireless radio link, separate development of algorithms for optimal propulsion control, navigation and communication with the ground-based control station. Whole design is highly modular, where each component can be replaced or modified according to desired task, payload or environmental conditions. Developed USV is planned to be utilized as a part of the system for detection and identification of marine and lake waste. Cameras mounted to the USV would record sea or lake surfaces, and recorded video sequences and images would be processed by state-of-the-art computer vision and machine learning algorithms in order to identify and classify marine and lake waste.