• 인터넷정보학회논문지
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• 제17권6호
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• pp.61-69
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• 2016

테스팅은 시스템의 요구사항을 바탕으로 테스트 케이스를 생성하여 소프트웨어에 내재되어 있는 결함을 발견하는 활동이다. 테스팅을 효과적으로 수행하기 위해서는 충실한 테스트 계획, 잘 작성된 테스트 케이스 생성과 더불어 체계적인 테스트 모니터링 활동이 요구된다. 테스트 자동화 방법에 대한 대부분의 연구들은 테스트 케이스 생성에서 테스트 실행까지의 자동화 방법에 초점이 맞춰져 있다. 본 연구에서는 이와 달리 테스트 모니터링의 자동화 방안에 대하여 연구한다. 이를 위해 테스트 모니터링 자동화를 위해 해결해야 할 요소를 도출하고 이를 기반으로 테스트 모니터링 자동화 프레임워크의 구축 방안을 제시한다.

• Smart Structures and Systems
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• 제17권3호
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• pp.445-470
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• 2016

In this study, the Bayesian probabilistic framework is investigated for modal identification and modal identifiability based on the field measurements provided in the structural health monitoring benchmark problem of an instrumented cable-stayed bridge named Ting Kau Bridge (TKB). The comprehensive structural health monitoring system on the cable-stayed TKB has been operated for more than ten years and it is recognized as one of the best test-beds with readily available field measurements. The benchmark problem of the cable-stayed bridge is established to stimulate investigations on modal identifiability and the present paper addresses this benchmark problem from the Bayesian prospective. In contrast to deterministic approaches, an appealing feature of the Bayesian approach is that not only the optimal values of the modal parameters can be obtained but also the associated estimation uncertainty can be quantified in the form of probability distribution. The uncertainty quantification provides necessary information to evaluate the reliability of parametric identification results as well as modal identifiability. Herein, the Bayesian spectral density approach is conducted for output-only modal identification and the Bayesian model class selection approach is used to evaluate the significance of different modes in modal identification. Detailed analysis on the modal identification and modal identifiability based on the measurements of the bridge will be presented. Moreover, the advantages and potentials of Bayesian probabilistic framework on structural health monitoring will be discussed.

• 농촌계획
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• 제2권2호
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• pp.109-117
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• 1996

The purpose of this study Is to develop water quality management system fort a farm village stream. The framework design of the system and the ecological monitoring of a test watershed were carried out, The system consists of GIS(Geographic Information System ), database, pollution source management, water quality and hydrologic analysis. Suri watershed located on Idong, Yongin city, Kyunggi Province, was selected as the test watershed for the application of the system. The fifteen's monitoring stations were chooses at up- and down-stream of the watershed. The results of an aquatic ecological monitoring were analyzed by the GPI(Group Pollution Index) method. The GPI revealed that water quality was varied within the stream. GPI and DO map for the watershed stream were developed, These maps facilitated to analyze the spatial distribution of the water quality.

• 전자공학회논문지CI
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• 제46권2호
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• pp.106-113
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• 2009

최근 건설 현장에서의 많은 안전사고 발생으로 인해, 건축물의 건전성 감시(Structural Health Monitoring, SHM)에 대한 많은 연구가 진행되고 있다. 이러한 SHM의 활용을 위한 대표적인 적용 기술이 무선 센서네트워크 기술(Wireless Sensor Networks, WSN)이다. 본 논문에서는 이러한 무선 센서네트워크 기술을 바탕으로 카메라가 장착된 휴대단말기에 3D 시각화와 증강현실(Augmented Reality, AR) 기술을 적용한 관찰 가능한 정보의 범위를 확장시켜주는 WIVA(WSN Monitoring Framework based on 3D Visualization and Augmented Reality in Mobile Devices) 시각화 시스템을 제안하였다. 제안된 시스템을 이용해 3층 건물 테스트베드에서의 화재 발생 실험을 수행하였다. 이를 통해, IEEE 802.15.4를 이용한 WSN 데이터를 활용한 3D와 AR 모드에서의 효용성을 검증하였다.

• Communications for Statistical Applications and Methods
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• 제25권5호
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• pp.501-512
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• 2018

We propose Sequential Patient Recruitment Monitoring (SPRM), a new monitoring procedure for patient recruitment in a clinical trial. Based on the sequential probability ratio test using improved stopping boundaries by Woodroofe, the method allows for continuous monitoring of the rate of enrollment. It gives an early warning when the recruitment is unlikely to achieve the target enrollment. The packet data approach combined with the Central Limit Theorem makes the method robust to the distribution of the recruitment entry pattern. A straightforward application of the counting process framework can be used to estimate the probability to achieve the target enrollment under the assumption that the current trend continues. The required extension of the recruitment period can also be derived for a given confidence level. SPRM is a new, continuous patient recruitment monitoring tool that provides an opportunity for corrective action in a timely manner. It is suitable for the modern, centralized data management environment and requires minimal effort to maintain. We illustrate this method using real data from two well-known, multicenter, phase III clinical trials.

• 한국지하수토양환경학회지:지하수토양환경
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• 제20권7호
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• pp.112-120
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• 2015

Statistical trend analysis using the data from the National Groundwater Quality Monitoring Network (NGQMN) of Korea was conducted to establish a new groundwater quality management framework. Sen’s test, a non-parametric statistical method for trend analysis, was used to determine the linear trend of the groundwater quality data. The analysis was conducted at different confidence levels (i.e., at 70, 80, 90, 95, and 99% confidence levels) for three of groundwater quality parameters, i.e., nitrate-nitrogen, chloride, and pH, which have sufficient time series of the NGQMN data between 2007 and 2013. The results showed that different trends can be determined for different depths even for the same monitoring site and the numbers of wells having significant trends vary with different confidence levels. The wells with increasing or decreasing trends were far less than the wells with no trend. Chloride had more wells with increasing trend than other parameters. On the other hand, nitrate-nitrogen had the most wells with increasing trend and concentration exceeding 75% of the threshold values (TVs). Based on the methodology used for this study, we suggest including groundwater TVs and trend analysis to evaluate groundwater quality and to establish an advanced groundwater quality management framework.

• 한국통신학회논문지
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• 제35권3B호
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• pp.474-484
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• 2010

본 연구에서는 항공화물 터미널 내에서의 항공화물 관리를 위해 RFID(Radio Frequency Identification, 무선인식)를 기반으로 하는 실시간 모니터링시스템개발을 소개한다. 시스템의 개발에 앞서 필요한 기능을 구현하고 개발 프레임워크를 구성하기 위해 인천공항 화물 터미널을 대상으로 요구사항을 분석하였으며 요구사항 분석에 따라 실시간 관리 기능을 구현하기 위해 RFID 기술에 대한 도입 방안을 연구하였다. RFID 기술의 적용 가능성을 실험하기 위해 인천공항 화물 터미널에서 RFID 장비들에 대한 성능을 실험하였고 예상되는 문제점들에 대한 분석을 위해 동일한 지점에서의 전파환경을 분석하였다. 위의 연구 결과들을 토대로 항공화물에 대한 모니터링 솔루션의 전체적인 시스템 구성은 EPC 네트워크를 기반으로 하였으며 시스템 구현의 유연성 및 확장성을 고려하여 시스템 아키텍처에 비즈니스 모델에 대한 시스템적인 정의를 위한 BPM(Business Process Modeling)솔루션을 도입하고 모니터링 솔루션은 웹 기반으로 개발하였다.

• Journal of Electrical Engineering and Technology
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• 제12권2호
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• pp.959-968
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• 2017

Electrical safety monitoring System (ESMS) is a critical component in modern power systems, which is characterized by large-scale access points, massive users and versatile requirements. For convenience of the information integration and analysis, the software development, maintenance, and application in the system, the cloud platform based ESMS is established and assessed in this paper. Firstly the framework of the system is proposed, and then the assessment scheme with a set of evaluation indices are presented, by which the appropriate cloud product can be chosen to meet the requirements of a specific application. Moreover, to calculate the weights of the evaluation indices under uncertainty, an improved interval AHP method is adopted to take into consideration of the fuzziness of expert scoring, the qualitative consistency test, and the two normalizations in the process of eigenvectors. Case studies have been made to verify the feasibility of the assessment approach for ESMS.

• Smart Structures and Systems
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• 제4권2호
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• pp.195-208
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• 2008

This paper summarizes the experimental vibration-based structural health monitoring study on a historical monument in Jordan. In this work, and within the framework of the European Commission funded project "wide-Range Non-Intrusive Devices Toward Conservation of Historical Monuments in the Mediterranean Area", a seven and a half century old minaret located in Ajloun (73 km north of the capital Amman) is studied. Because of their cultural value, touristic importance and the desire to preserve them for the future, only non-destructive tests were allowed for the experimental investigation of such heritage structures. Therefore, after dimensional measurements and determination of the current state of damage in the selected monument, ambient vibration tests are conducted to measure the accelerations at strategic locations of the system. Output-only modal identification technique is applied to extract the modal parameters such as natural frequencies and mode shapes. A Non-linear version of SAP 2000 computer program is used to develop a three-dimensional finite element model of the minaret. The developed numerical model is then updated according to the modal parameters obtained experimentally by the ambient-vibration test-results and the measured characteristics of old stone and deteriorated mortar. Moreover, a parametric identification method using the N4Sid state space model is employed to model the dynamic behavior of the minaret and to build up a robust, immune and noise tolerant model.

• 한국정보과학회논문지:시스템및이론
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• 제34권8호
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• pp.348-366
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• 2007

현대 저장장치는 점차 소형화, 대용량화 되어감에 따라 디스크의 집적도는 크게 증가되어지고 있어 물리적인 오류가 발생하면 많은 디지털 정보가 소실 될 수 있다. 따라서 이에 대한 대처의 필요성이 점차 증가되어 본 논문에서는 파일시스템이 물리적인 오류에 대한 강인성과 무결성을 보장하고 있는지를 검증하는 테스트 프레임 워크를 제안하였다. 이와 같은 테스트 프레임워크를 위해 디스크 상에 실제 베드섹터를 만들 수 있는 도구 및 저장장치에서 정의하고 있는 물리적인 오류를 모두 발생시킬 수 있는 도구를 각각 개발하였고, 파일시스템에서 저장장치에 읽기/쓰기 동작이 수행되는 상황을 즉시 모니터링 할 수 있는 도구를 추가 개발하여 FORT라는 이름의 파일시스템 강인성을 검증하는 테스트 프레임 워크를 최종적으로 구성하였다. FORT를 이용해서 신뢰성 및 견고성을 위주로 개발된 EXT3파일시스템을 대상으로 강인성의 수준을 나타낼 수 있는 분석표를 작성하였으며, 이를 분석하였다. 또한 파일시스템과 디바이스 드라이버 영역의 계층화된 구조를 융합할 수 있는 도구를 개발하여 획기적인 지능형 시스템으로 발전할 수 있는 방향을 제시하였다.