• 한국주거학회논문집
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• 제27권5호
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• pp.25-35
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• 2016

he objective of this study was to investigate home network systems presently applied in multi-housing complexes and resident's usage to improve the utilization of these systems and services as well as maintenance methods. Subjects were 27 housing complexes equipped with home network systems in west Pangyo area. The investigation methods of communal network systems were observed and photographed. Unit systems were investigated through photography, interviews, and observation focusing on the utilization of Wall-Pads by visiting one unit of each housing complex. The results are as follows: (1) Most housing complexes that we investigated were built with high-grade IT infrastructure. Also, remote meter reading, electronic security, vehicle access, and building access systems were established. Wall-Pads with similar functions were installed in 23 housing complexes, excluding private rental housing complexes. (2) Even though people were well aware of the need for common systems within their housing complexes, only 10~20% of Wall-Pad menus were used. (3) Low utilization rates of home network stem from Wall-Pad menus which were user-unfriendly, and a lack of user training for the complex's common system and unit system. Therefore, to promote active use of home network systems, the systems must be diversified in accordance with user characteristics. In addition, the Wall-Pad menus should be reorganized to be user-friendly.

• 한국정보통신학회논문지
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• 제17권7호
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• pp.1627-1632
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• 2013

클라우드 컴퓨팅 기술은 기업의 IT 인프라에 대한 유지보수 부담을 경감시키고, 기업의 IT 기술 혁신을 통한 비용절감을 이룰 수 있는 경제적 기대가 높은 분야이다. 특히, 안드로이드 기반의 클라우드 컴퓨팅 모니터링 시스템은 성숙기에 접어든 IT 인프라 환경에서 꼭 필요한 운영 솔루션이다. 따라서 본 논문에서는 클라우드 컴퓨팅 환경의 사용자 관리 측면에서 실시간 서버 상황을 체크하며 이상 유무 발생시 안드로이드 폰을 통해 실상황을 전송하고 이에 관리자가 원격지에서도 서버의 상황을 진단 및 처리가 가능한 기술을 적용한 시스템을 개발하고자 한다.

• 한국물환경학회지
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• 제21권2호
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• pp.132-140
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• 2005

The pilot test of a new alternative for small wastewater treatment system has been conducted for two years. It consists of a hybrid bioreactor and the expert system including the process control logic, PLC system, and HMI for the process automation. In order to monitor and remote control its status, the real-time data was transferred from the on-site control center to the central station via a wireless local area network. More efficient and stable performances were observed at automatic operating mode compared with the manual. On an average, COD, SS, T-N and T-P concentrations in the effluent from the hybrid bioreactor were less than 14, 7, 12 and 0.9 mg/L, respectively. According to the result from pilot tests, the quality of treated wastewater with sand filtration was enough to be utilized again.

• Nuclear Engineering and Technology
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• 제27권5호
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• pp.661-669
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• 1995

원자력시설에서 점검 및 보수작업을 위하여 이동로보트 KAEROT을 개발하였다. 이동로보트의 주행장치는 소차륜들이 부착된 유성차륜의 형태로 구성되어 높은 안정성을 유지하며 계단을 포함한 많은 장애물의 승하강이 가능하도록 설계하였다 본 논문에서는 로보트의 원격조작을 용이하게 하기 위하여 이동로보트의 기구학적 해석을 통하여 역기구학 해를 구하였고, 자동 계단승월 알고리즘을 제안하였다. 제안된 알고리즘은 이동경로를 결정한 후 제안된 기준경로를 추종할 수 있도록 각 차륜의 각속도를 구하는 것이다. 제작 오차가 있는 실험실내 계단에 대하여 시뮬레이션 및 실험을 수행하였다. 제안된 알고리즘은 로보트 몸체의 경사각도를 낮게 유지시킬 수 있었고, 주행중 안정성을 높혀주었다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.1016-1019
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• 2009

암반사면의 설계, 사공, 유지보수를 위해서는 암반의 지질구조에 대한 정밀한 조사가 이뤄져야 하나 한정된 노출면에서 행하여지는 조사는 한계가 있으며, 물리탐사 등의 보조 조사 역시 충분한 정보를 획득 하는데는 한계가 있다. 이러한 문제를 보완하기 위한 조사방법으로 입체사진을 이용한 원격조사방법 (Surface Mapper)과 시추공 자료의 투영을 위한 S/W (Fracjection)를 개발하였다. 입체사진을 이용한 원격 조사가법은 사진측량의 원리를 응용하여 암반 절취면에 분포하는 절리, 단층, 엽리 등의 면구조를 3차원으로 측정하고 데이터베이스화 하는 것이며 시추공 자료의 투영기법은 BIPS, Televideo 혹은 DOM 시추 등을 이용하여 시추공내에서 측정된 면구조의 배열을 예상 절취면에 투영하는 기법이다. 이 기법들은 면구조의 3 차원 배열과 절취면의 위치를 실제 3 차원으로 분석할 수 있는 새로운 사면의 조사, 설계, 사공 및 유지관리의 방안을 제시하고 있다.

• ETRI Journal
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• 제40권5호
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• pp.664-676
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• 2018

Given the rapidly increasing market penetration of photovoltaic (PV) systems in many fields, including construction and housing, the effective maintenance of PV systems through remote monitoring at the panel level has attracted attention to quickly detect faults that cause reductions in yearly PV energy production, and which can reduce the whole-life cost. A key point of PV monitoring at the panel level is cost-effectiveness, as the installation of the massive PV panels that comprise PV systems is showing rapid growth in the market. This paper proposes an implementation method that involves the use of a panel-level wireless PV monitoring module (WPMM), and which assesses the cost-effectiveness of this approach. To maximize the cost-effectiveness, the designed WPMM uses a voltage-divider scheme for voltage metering and a shunt-resistor scheme for current metering. In addition, the proposed method offsets the effect of element errors by extracting calibration parameters. Furthermore, a design method is presented for portable and user-friendly PV monitoring, and demonstration results using a commercial 30-kW PV system are described.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 춘계학술대회 논문집 전기설비전문위원
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• pp.99-102
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• 2007

Infrared thermography is one of the most valuable and cost-effective diagnostic techniques for predictive maintenance on electrical systems. For the installations, the thermography can identify major problems, which if left unattended could lead to breakdowns. The result thermal images depend upon operator skills, inspection technique, and weather conditions. When the thermographer is applied to remote monitoring, the conditions of the systems are not perfectly analyzed because operators are hard to know the weather effects of the installed place. Therefore, this paper defines the effect by weather conditions these factors will influence the final results. The purpose of this paper is to define the weather effects that a thermographer needs to consider for successful condition analysis.

• 전기학회논문지P
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• 제53권2호
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• pp.89-93
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• 2004

Supervisory Control And Data Acquisition(SCADA) of electric power system refersto the system that displays, monitors and executes the control commands for remote electric power system. KNR's existing electric power control system is built on UNIX platform such that it costs more for system construction, and people with UNIX skills can only be an operator who controls and manages the system. Moreover, since the system is mainly operated in local offices, system operators must communicate with local operators to investigate the cause of the accident and react the accident every time the system fails. As a new integrated SCADA system is constructed, establishment of small-unit electric power control system, that alters local electric power control system in designated stations, is required. In this study, the electric power control system, which accommodates all functions of UNIX-based SCADA system and facilitates operation and even maintenance for local operators, is to be developed. In order to develop small-unit electric power control system, the industrial automation program, "Cimon", is used. The small-unit electric power control system that accommodatesRTU and newly installed electronic switchboard is being developed and tested at Chulam station of KNR.

• Journal of Electrical Engineering and Technology
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• 제9권5호
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• pp.1643-1653
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• 2014

This paper presents the design and implementation of a wind-solar hybrid power system for LED street lighting and an isolated power system. The proposed system consists of photovoltaic modules, a wind generator, a storage system (battery), LED lighting, and the controller, which can manage the power and system operation. This controller has the functions of maximum power point tracking (MPPT) for the wind and solar power, effective charging/discharging for the storage system, LED dimming control for saving energy, and remote data logging for monitoring the performance and maintenance. The proposed system was analyzed in regard to the operation status of the hybrid input power and the battery voltage using a PSIM simulation. In addition, the characteristics of the proposed system's output were analyzed through experimental verification. A prototype was also developed which uses 300[W] of wind power, 200[W] of solar power, 60[W] LED lighting, and a 24[V]/80[Ah] battery. The control system principles and design scheme of the hardware and software are presented.

• 한국안전학회지
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• 제19권1호
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• pp.23-30
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• 2004

Modern production systems are very complex by request of automation, and failure modes that occur in thisautomatic system are very various and complex. The efficient fault diagnosis for these complex systems is essential for productivity loss prevention and cost saving. Traditional fault diagnostic system which perforns sequential fault diagnosis can cause catastrophic failure during diagnosis when fault propagation is very fast. This paper describes the Real-time Intelligent Multiple Fault Diagnosis System (RIMFDS). RIMFDS assesses current machine condition by using sensor signals. This system deals with multiple fault diagnosis, comprising of two main parts. One is a personal computer for remote signal generation and transmission and the other is a host system for multiple fault diagnosis. The signal generator generates various faulty signals and image information and sends them to the host. The host has various modules and agents for efficient multiple fault diagnosis. A SUN workstation is used as a host for multiple fault modules and agents for efficient multiple fault diagnosis. A SUN workstation is used as a host for multiple fault diagnosis and graphic representation of the results. RIMFDS diagnoses multiple faults with fast fault propagation and complex physical phenomenon. The new system based on multiprocessing diagnoses by using Hierarchical Artificial Neural Network (HANN).