• Journal of Multimedia Information System
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• 제2권4호
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• pp.317-326
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• 2015

The paper deals with the analysis of the effectiveness of acoustic emission monitoring and diagnostics of engineering products. We discuss the results of the processing results of the field experiment to study the acoustic emission in the alloy and its welded joints in the presence of technological defects. We study the characteristics of the output of acoustic emission signals at different stages of elastic-plastic deformation of alloys. Analyzed acoustic chart and the output waveform of the acoustic emission for the different types of welds. Studies have shown the effectiveness of the Acoustic emission techniques and help improve the accuracy of non-destructive testing systems in problems of automation and control.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제42권
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• pp.15.1-15.8
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• 2020

Background: Reconstructing maxillofacial defects is quite challenging for most surgeons due to the region's complex anatomy and cosmetic and functional effects on patients. The use of pre-made alloplastic implants and autogenous grafts is often associated with resorption, infection, and displacement. Recent technological advances have led to the use of custom computer-designed patient-specific implants (PSIs) in reconstructive surgery. This study describes our experience with PSI, details the complications we faced, how to overcome them, and finally, evaluates patient satisfaction. Case presentation: Six patients underwent reconstruction of various maxillofacial defects arising due to different etiologies using PSI. A combined total of 10 implants was used. PEEK was used to fabricate 8, while titanium was used to fabricate 2. No complications were seen in any patient both immediately post-op and in subsequent follow-ups. All patients reported a high level of satisfaction with the final result both functionally and cosmetically. Conclusion: The use of computer-designed PSI enables a more accurate reconstruction of maxillofacial defects, eliminating the usual complications seen in preformed implants and resulting in higher patient satisfaction. Its main drawback is its high cost.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.354-358
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• 2006

In addition to documents or technologies at working place, the importance of technology management riese through increasing know-hows. In particular, in the field of construction, a variety of management systems including ERP and PMIS have been introduced since 90's. Therefore, the range of shared information extends to construction grounds, headquarters or even to collaborating companies. It means that the competitiveness of companies depends on the efficient management of technological documents in the field of construction. Accordingly, this study shows the purpose to develop the construction system which save, search and share technological information in order to improve any problem of current construction systems. The construction system offers you both the searching function and the viewing function for various information. In addition, the system contains the highlighting function to know if any information is available. The Construction system is possible to be used with current systems at the same time because is is designed to make up for them. In addition, it is expected to solve their problems and supplement their defects.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.859-862
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• 2008

We present a new tool to measure precisely the emissive properties of displays at the pixel level with submicrometric spatial resolution. It is useful to check the technological defects and their impact on the emissive properties of the displays. Backlight films and transflective and reflective displays are measured.

• International Journal of Railway
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• 제5권1호
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• pp.22-28
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• 2012

This report is devoted to the problems of Mongolian Railway Transportation Safety such as high length of wagon service life, defects due to the more factors of exploitation, idle time, increase of faults, poor condition of repairing shops and more hand and mechanical operations and these conditions are quite difficult to meet the safety and reliability of increasing transportation from day to day. The paper discusses that the most optimum solution is diagnosing before occurring wear, breakdown, and defects on the basis of studying characteristics of structural material breakdown, residual methods of voltage, effects of material hardness and linear defects of a crystal net and the reform of machines is very important to implement it. It focuses the structures, characteristics of the material transportation and tests and analyses of the wagon cart which has to meet the traffic safety of wagons and slow and soft movement. The study is done on the wagon chassis which has to meet the traffic safety of luggage wagons.

• 한국공작기계학회논문집
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• 제16권5호
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• pp.157-161
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• 2007

There are technological changes to reduce the size and weight of electronic components and to accommodate multi-functions in them. To meet this trend, more complicated technological processes are required. To maintain the processes, more accurate inspection systems are also necessary. Therefore, new inspection methods are needed, which is differ from conventional inspection methods such as electrical test methods ICT(In-Circuit Test), FCT(Function Test) and visual test using optical equipments. One of the possible approaches is non-destructive test using X-ray. In this paper, an inspection method using X-ray is developed and applied to inspection of soldering state and internal defects of electronic components.

• Clinical and Experimental Pediatrics
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• 제53권6호
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• pp.680-687
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• 2010

Patients with congenital heart diseases (CHD) are confronted with early- and late-onset complications, such as conduction disorders, arrhythmias, myocardial dysfunction, altered coronary flow, and ischemia, throughout their lifetime despite successful hemodynamic and/or anatomical correction. Rhythm disturbance is a well-known and increasingly frequent cause of morbidity and mortality in patients with CHD. Predisposing factors to rhythm disturbances include underlying cardiac defects, hemodynamic changes as part of the natural history, surgical repair and related scarring, and residual hemodynamic abnormalities. Acquired factors such as aging, hypertension, diabetes, obesity, and others may also contribute to arrhythmogenesis in CHD. The first step in evaluating arrhythmias in CHD is to understand the complex anatomy and to find predisposing factors and hemodynamic abnormalities. A practical stepwise approach can lead to diagnosis and prompt appropriate interventions. Electrophysiological assessment and management should be done with integrated care of the underlying heart defects and hemodynamic abnormalities. Catheter ablation and arrhythmia surgery have been increasingly applied, showing increasing success rates with technological advancement despite complicated arrhythmia circuits in complex anatomy and the difficulty of access. Correction of residual hemodynamic abnormalities may be critical in the treatment of arrhythmia in patients with CHD.

• Journal of Information Processing Systems
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• 제14권3호
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• pp.751-770
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• 2018

Web applications are indispensable in the software industry and continuously evolve either meeting a newer criteria and/or including new functionalities. However, despite assuring quality via testing, what hinders a straightforward development is the presence of defects. Several factors contribute to defects and are often minimized at high expense in terms of man-hours. Thus, detection of fault proneness in early phases of software development is important. Therefore, a fault prediction model for identifying fault-prone classes in a web application is highly desired. In this work, we compare 14 machine learning techniques to analyse the relationship between object oriented metrics and fault prediction in web applications. The study is carried out using various releases of Apache Click and Apache Rave datasets. En-route to the predictive analysis, the input basis set for each release is first optimized using filter based correlation feature selection (CFS) method. It is found that the LCOM3, WMC, NPM and DAM metrics are the most significant predictors. The statistical analysis of these metrics also finds good conformity with the CFS evaluation and affirms the role of these metrics in the defect prediction of web applications. The overall predictive ability of different fault prediction models is first ranked using Friedman technique and then statistically compared using Nemenyi post-hoc analysis. The results not only upholds the predictive capability of machine learning models for faulty classes using web applications, but also finds that ensemble algorithms are most appropriate for defect prediction in Apache datasets. Further, we also derive a consensus between the metrics selected by the CFS technique and the statistical analysis of the datasets.

• 한국재난정보학회 논문집
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• 제17권1호
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• pp.112-119
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• 2021

연구목적: 본 연구는 일선 소방관서에 사용되고 있는 소방용 고가사다리차, 굴절사다리차, 화학차 및 펌프차의 최근 6년간의 정밀점검의 데이터를 기반으로 차종별로 시·도별 실시현황, 결함 발생률 및 연도별 결함 발생 사항 등을 파악하여 소방차량의 기술발전에 기여함을 목적으로 한다. 연구방법: 소방용의 고가사다리차, 굴절사다리차, 펌프차 및 화학차의 최근 6년간 정밀점검 기준에 따라 실시한 정밀점검 데이터를 통하여 차종별, 시·도별 실시현황 및 결함발생률, 연도별 결함사항을 분석하여 사용 연수에 따른 결함 발생 등의 현상을 분석하였다. 연구결과: 평균 230대 이상의 정밀점검 차량을 신청한 2012년에서 2017년도까지 시·도별 결과, 약간의 변동을 보여주기는 하지만 노후 소방차량 교체사업과 소방차량 제조업체의 대응 등으로 결함 발생 건수가 점차 감소 되는 결과를 보여주었다. 결론: 소방고가사다리차의 경우 결함발생율은 승강기장치, 전기장치, 사다리장치, 공압공급 장치의 순서로 결함의 발생률이 나타나는 것으로 파악되었으며, 소방굴절사다리차의 경우 굴절사다리, 유압실린더, 유압오일, 공압공급 장치의 순서로 결함의 발생률이 나타나는 것을 확인할 수 있었다. 소방화학차의 경우는 분말소화장치, 소방펌프, 진공펌프, 공압공급 장치의 부분에서 결함이 발생되는 것을 확인할 수 있었으며, 소방펌프차의 경우는 물탱크, 소방펌프, 진공펌프 및 공압공급 장치의 부분에서 결함이 발생하는 것을 확인할 수 있었다.

• Journal of Electrical Engineering and Technology
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• 제4권1호
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• pp.28-34
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• 2009

In a Gas Insulated Substation (GIS), Very Fast Transients (VFTs) are generated mainly due to switching operations. These transients may cause internal faults, i.e., layer-to-layer faults in a capacitively graded bushing as it is one of the most important terminal equipment for GIS. The healthiness of the bushing is generally verified by measuring its leakage current. However, the change in current magnitude/pattern is only marginal for different types of fault conditions. Leakage current monitoring (LCM) systems generate large amounts of data and computer aided interpretation of defects may be of great assistance when analyzing this data. In view of the above, ANN techniques have been used in this study for identification of these minor faults. A single layer perceptron network, a two layer feed-forward back propagation network and cascade correlation (CC) network models are used to identify interlayer faults in the bushing. The effectiveness of the CC network over perceptron and back propagation networks in identification of a fault has been analysed as part of the paper.