• 한국컴퓨터정보학회논문지
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• 제19권12호
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• pp.247-255
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• 2014

본 논문은 기존 버스정보시스템이 가지고 있는 단점인 텍스트 기반의 시스템을 보완하고 GUI 기반의 사용자 요구형식의 콘텐츠를 전달하고 스마트폰 GPS를 활용한 버스정보시스템을 설계 및 구현한다. 기존 버스정보시스템은 단말기를 버스에 설치하고 정류장별로 안내판을 설치하는 비용적인 문제와 설치 후 유지보수에 대한 막대한 비용이 소요되고 있다. 제안 시스템은 스마트폰의 지도화면을 활용한 버스노선도 및 사용자의 위치 확인, 내 주변 가까운 버스 정류장 찾기, 지도화면 위의 버스노선도 표현, 버스도착예측시간의 정확도 증가를 위한 알고리즘 적용, 내선 순환 버스의 노선구축 기능을 제공한다, 버스도착예측시간 제공의 정확도는 기존 시스템의 약 67% 대비 약 88.71%로 21.71% 증가하였으며, 텍스트와 테이블 UI의 기존시스템을 지도를 기준으로 하는 GUI 형태로 개선하였다. 그 결과 개선된 버스정보시스템에서는 스마트폰의 GPS를 활용하여 기존 버스정보시스템을 보완하고 사용자들의 다양한 요구를 만족시킬 수 있었다.

• 한국인터넷방송통신학회논문지
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• 제16권6호
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• pp.211-215
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• 2016

본 논문은 기존의 버스정보시스템에서 제공하는 서비스를 활용한다. 버스를 이용하는 승객에게 제공되는 버스노선과 버스 정류장에 도착하는 버스의 남은 시간등과 같은 버스정보시스템의 한계를 개선하고자한다. 버스의 탑승인원을 IoT(사물인터넷) 센서네트워크 시스템을 적용하여 버스 이용 고객에게 해당 버스의 혼잡도 정보를 제공한다. 대중교통을 이용 하는 승객에게 버스혼잡도등을 스마트폰의 앱을 통하여 제공하여 기존 버스에서 승객 몰림으로 인하여 발생할 수 있는 안전사고 등을 예방하고 보다 효율적이고 편리하게 대중교통을 이용할 수 있도록 개선된 버스정보안내시스템을 제안한다. IoT 센서네트워크를 사용한 프로토타입 시스템을 개발하여 본 제안방법을 검증하였다.

• 한국군사과학기술학회지
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• 제13권2호
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• pp.258-267
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• 2010

The necessity of the new system development arises in both defence and commercial systems industry either when a breakthrough in technology needs to be realized in the form of a brand-new system or when the existing product already in operation needs to be upgraded to satisfy the increasing stakeholder's requirements. In the latter case, it is not rare that specific system technical specifications on the existing products are not available. The purpose of this study is to investigate how to handle the difficulty when an upgraded system is required to be developed based on the existing product whose detailed technical specifications cannot be obtained. A step-by-step process is described based on the reverse engineering of the existing product. As a result, a logical system model is obtained for the product. The process developed is further enhanced and evaluated by the computer-aided system engineering tool. The resulting logical system model should be helpful in the next phase of the new product development.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제8권3호
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• pp.97-108
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• 2019

디지털 콘텐츠 재화가 증가됨에 따라 이를 관리하기 위한 콘텐츠 관리 시스템에 새로운 콘텐츠 서비스를 추가하거나 기존 콘텐츠 관리 시스템 간에 통합하는 경우가 빈번하게 발생한다. 효율적인 시스템 통합을 위해 본 논문에서는 이 기종으로 구성된 두개의 콘텐츠 관리 시스템을 마이크로서비스 아키텍처 기반으로 통합 콘텐츠 관리 시스템을 설계하여 개발 간 기존 시스템의 중단 없이 재활용이 가능하고, 효율적으로 통합이 가능하며, 확장성을 가진 시스템을 구현하였다. 이를 통해 구현된 시스템의 소요되는 자원 사용량을 측정하고, 기존 미들웨어를 사용한 시스템 통합을 방식 간의 차이점을 분석하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.499-500
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• 2007

The various sensor nodes operating in Ubiquitous Sensor Network environment require the tiny Operating System different from the existing pc-type operating system because of their characteristics. Also Sensor Network operating system needs to support the rapid event handling which sensor node must implement. In this paper, we overcome the drawbacks of the existing sensor network operating system and propose the new kernel which is designed to assist developer to construct event-central operating system entirely. We also evaluate the performance of the super tiny sensor network operating system based on proposed kernel, comparing with that of the existing sensor network operating system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.525-526
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• 2007

Recently, there has been growing interest in utilizing distributed generation (DG). However, an insertion of DG to existing distribution system can cause several problems such as voltage variations, harmonics, protective coordination, increasing fault current etc,. The typical protection system of the existing distribution system is designed for radial network. But penetration of DG to distribution system changes existing unidirectional power flow to bidirectional power flow. Therefore, investigation to cover whole field of distribution system must be accomplished such as changing of protection devices rating by increasing fault current, reevaluation of protective coordination. This paper presents that PSCAD/EMTDC simulations was accomplished to analyze effect of DG on the distribution protective coordination. In addition, directional recloser-sectionalizer coordination are evaluates distribution system with DG by using PSCAD/EMTDC simulation.

• 한국신뢰성학회지:신뢰성응용연구
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• 제1권2호
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• pp.121-138
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• 2001

Due to large demand for high speed and great capacity for data transfer, WDM, which uses the wavelength division multiplexing technique, is known as alternative way to satisfy those demand for its flexible network operation and management, easy network expansion with existing networks, and enhancement of efficient data transfer rate. For these reasons, a new high capacity WDM optical communication network plan was established. Therefore, the quality of currently deployed optical cables with 81.6 km in length should be assessed to ensure if high capacity WDM system could be implemented on existing optical cables. Two important characteristic parameters, Transfer Loss and PMD (Polarization Mode Dispersion), were measured to evaluate quality of existing optical cable. Transfer Loss was measured at 0.244 dB per kilometer, which is lower than the design standard value at 0.275 dB/km. The measured PMD value gave at 0.030ps/km, and it, therefore, satisfies the value recommended by ITU-T (International Telecommunication Union-T) of 0.5ps/km. In addition, the transfer characteristic for existing 2.5 Gbps and 10 Gbps system were measured and evaluated, and the results showed that error-free transfer is very much feasible. Computer simulation for DWDM system, which is likely be a future backbone network in Korea, to assess the transfer characteristic using the same condition employed for 2.5 Gbps and 10 Gbps was carried out as well. The simulation verified that a stable network operation and reliable service could be provided.

• KIEAE Journal
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• 제17권5호
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• pp.25-31
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• 2017

Purpose: Currently, there are many success stories coming out various energy-saving / production or eco-friendly buildings. However, these case and method didn't consider of application with existing housing and high-rise housings. In the case of Europe, the North America is gradually grew and settle through the voluntary, small, private development. But this method and system are not fit for the majority of developing countries including South Korea. Method: In this situation, this paper analyse, first arranged previous research and case study, second divided factors and re-organized factors, third analysed plan and elevation of apartment and selected main plan type and elevation type of apartment, finally analysed method of application with existing buildings and high-rise buildings by test and simulation. Result: In sum, this research finally analyzed the change of electricity and fuel consumption according to the change of insulation standard. This study has been expected to serve as a bridge of the energy housing system development and suggest new method applied to the existing housing and building.

• 상하수도학회지
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• 제20권2호
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• pp.187-196
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• 2006

Forecasting the long-term water demand is important in the plan of water supply system because the location and capacity of water facilities are decided according to it. To forecast the long-term water demand, the existing method based on lpcd and population has been usually used. But, these days the trend among the variation of water demand has been disappeared, so expressing other variation of it is needed to forecast correct water demand. To accomplish it, we introduced the System Dynamics method to consider total connections of water demand factor. Firstly, the factors connected with water demand were divided into three sectors(water demand, industry, and population sectors), and the connections of factors were set with multiple regression model. And it was compared to existing method. The results are as followings. The correlation efficients are 0.330 in existing model and 0.960 in SD model and MAE are 3.96% in existing model and 1.68% in SD model. So, it is proved that SD model is superior to the existing model. To forecast the long-term water demand, scenarios were made with variations of employment condition, economic condition and consumer price indexes and forecasted water demands in 2012. After all scenarios were performed, the results showed that it was not needed to increase the water supply ability in Seoul.

• 한국컴퓨터정보학회논문지
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• 제20권7호
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• pp.91-97
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• 2015

In this paper, we designed a emergency medical image communication system EMICS added concept of emergency medical image to the existing emergency medical information system based on DICOM. Also we suggested a emergency medical image object EMISPS of EMICS. Using EMICS, the emergency medical technician can work together with emergency doctor. Therefore the patient can take more stable care than existing emergency medical information system. Using EMISPS, the emergency medical technician can get exact situation information of the patient.