• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.5
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• pp.479-485
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• 2013

In this paper, we propose a smart farming system using the visible light communication based on the software defined radio (SDR) technology and the conventional RF radio. The proposed system can continuously monitor growth environments of the LED plant factory and automatically control the LED plant factory to keep optimal growth environments. Furthermore, by creating a database from various growth factors, the LED plant factory can be efficiently managed.

• Journal of Internet Computing and Services
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• v.2 no.2
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• pp.65-70
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• 2001

In this paper, a Modified RED algorithm for congestion avoidance in IP networks is presented. The RED detects incipient congestion by computing the average queue size. By notifying only a randomly selected fraction of connection, it causes to the global synchronization or fairness problem, And also, the network characteristics need to be known in order to find th optimum average queue length. When the average queue size exceeds a minimum threshold, a modified RED algorithm drops packets based on the state of each connection. Performance is improved because of keeping the average queue size low while allowing occasional bursts of packets in the queue, we compare performance of modified RED with RED and Drop Tail in terms of goodput, network utilization and fairness.

• Journal of the Korean Institute of Intelligent Systems
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• v.25 no.5
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• pp.464-469
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• 2015

This paper presents the smart system platform for remotely controlling the windows and doors system(WDS), which gathers and analyzes the state of WDS and the environmental data for preventing crimes and keeping a pleasant indoor. In particular, standard API between the smart WDS platform and the smart home platform has been presented to be easy to a home services, such as security, safety, and home appliance control. The private gateway of wire and wireless communication interfaces has been developed to remotely control and monitor the WDS for anytime and anyplace solving the crime prevention and ventilation problem. Web-and App-based user interface in order to detect the opening and shutting states and remotely control WDS have also been developed to support the mobile environment, respectively.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.4
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• pp.219-226
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• 2018

IIoT(Industrial Internet of Thing) means that all manufacturing processes are informed beyond the conventional automation of process automation. The objective of the system is to build an information system based on the data collected from the sensors installed in each process and to maintain optimal productivity by managing and automating each process in real time. Data collected from sensors in each process is unstructured and many studies have been conducted to collect and process such unstructured data effectively. In this paper, we propose a system using Node-RED as middleware for effective big data collection and processing.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.21 no.9
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• pp.513-518
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• 2009

The building HVAC systems generally have very different qualities of performance and durability with the superintendent's interest in or capability of management and maintenance of them. The poor management of these systems finally lead to the shortening of the life expectancy and result in the increase of operating cost and energy consumption due to their low efficiencies. So it is necessary to develop tools to maintain adequately and to operate efficiently various building service equipments in order to cope with actively the global environment problems and energy crises. In this study the LCC based calculation program and package were developed, which could be used for analyses of the economic performance and determination of the reasonable maintenance time and methods of building HVAC systems.

• Journal of the Korean Society for Library and Information Science
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• v.36 no.1
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• pp.25-40
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• 2002

With the perspective of information management, on-going monitoring of the specified service function is one of the major activities and even critical process. The research consisted of three empirical research questions such as, the current usage and overall user-satisfaction, the quality of the R&D information content and the service, and the problems which have been observed by the actual user group of National Digital Science Library (NDSL). The results of the investigation provided several guidelines that can be utilized for the improvements of the R&D information user service as well as some recommendations for overall optimal administration.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.412-413
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• 2007

정보시스템의 개발 및 유지보수에 대한 기준은 과기처 등에서 제정한 'S/W 개발비 산정기준'을 준용하고 있다. 그러나 본 기준이 Business Computing 환경을 기준으로 작성되었고, 전력계통 제어를 비롯한 각종 공정제어시스템 구축 환경에 부적합할 뿐 아니라 시스템의 뼈대(Frame)를 구성하는 H/W의 규모 산정이 누락되어 있는 상태이다. 전력거래소는 우리나라의 전력계통 환경에 적합한 한국형 에너지관리시스템(이하 K-EMS)의 국산화 개발을 각종 첨단 S/W의 탑재 기준에 따라 단계별(Baseline, Prototype, Fullscale)로 추진하면서, 각 단계에 가장 적합한 하드웨어의 용량 산정 기준을 선정하는 작업을 진행하고 있다. 이는 정보시스템 개발에서 자원의 낭비를 최소화하고 전체 개발비용을 절감 할 수 있다는 점에서 매우 중요하다. 본 연구에서는 K-EMS 시스템 국산화 개발을 위해 K-EMS가 수용할 각종 응용프로그램별 특성을 감안한 하드웨어의 적정 용량 산정 기준과 적용방안을 제시하고, CPU, Memory 등 세부 항목에 대한 고려항목을 언급함으로써 최적의 K-EMS 하드웨어 Sizing 산정방안을 소개하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.134-136
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• 2015

본 논문은 일반 가정집, 아파트 및 사무실과 같은 좁은 생활공간에서 재배되는 다양한 식물 특성정보와 주변 환경 정보를 이용하여 재배 식물의 생장환경을 최적으로 지원할 수 있는 아두이노 플랫폼 기반의 식물 재배 지원 시스템을 제안한다. 제안하는 시스템은 스마트폰을 통해 사용자에게 식물 주변 환경 정보의 모니터링 및 간단한 습도 및 온도 원격제어 기능을 실시간 제공한다. 제안하는 시스템을 통해 사용자는 저렴한 비용으로 소중한 재배 식물의 안전한 생장을 유지할 수 있으며, 향후 다양한 환경 센서 및 상황 정보를 활용한 지능형 식물 관리 시스템 연구에 도움이 될 것으로 기대된다.

• Journal of Korean Society of Transportation
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• v.17 no.1
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• pp.53-65
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• 1999

This paper attempts to find an improved organizational structure for operating the traffic safety facilities. Currently, police is in charge of the facilities while the local government is in charge of its budget. By doing so, many inefficiencies and problems occur in these things. A delphi technique is used to survey these inefficiencies. Problems, and improved role and organization by three expert groups in local government, police and university The survey results are analyzed by each expert group as well as by the total group. The multidimensional scaling technique is also used. The most preferable answer is to newly establish a traffic experts' agency under the local government. The second preferable answer is to set the current traffic police under the control of the local government.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.7
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• pp.963-971
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• 2022

Water pipeline network in local and metropolitan area is buried underground, by which it is hard to know the degree of pipe aging and leakage. In this study, assuming various sensor combinations installed in the water pipeline network, the optimal algorithm was derived by predicting the water flow rate and pressure through artificial intelligence algorithms such as linear regression and neuro fuzzy analysis to examine the possibility of detecting pipe leakage according to the data combination. In the case of leakage detection through water supply pressure prediction, Neuro fuzzy algorithm was superior to linear regression analysis. In case of leakage detection through water supply flow prediction, flow rate prediction using neuro fuzzy algorithm should be considered first. If flow meter for prediction don't exists, linear regression algorithm should be considered instead for pressure estimation.