• Structural Engineering and Mechanics
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• 제56권4호
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• pp.695-705
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• 2015

Distressed structures require necessary remedial measures in order to restore their original structural properties like strength and stiffness. Validating the effectiveness of the proposed qualitative remedial measure experimentally is of utmost importance as there is no well-established analytical method to verify the effectiveness of the same quantitatively. Prototype testing which would have been the best option for this purpose would not only prove costly but also be associated with numerous practical difficulties; hence model testing is resorted as the only option for the purpose. This paper presents one such typical experimental study on the structural behavior of a distressed bridge, mainly observed in the form of prominent tilt in the bearing plate in transverse and longitudinal direction on downstream side. The main focus of the proposed experimental investigation is to assess the structural behavior particularly the load carrying capacity. The extent of deformation of some models with specific structural arrangements and some models with specific need based remedial measures were also studied. This study also assessed the contribution of each remedial measure towards restoration individually and collectively.

• 한국학교수학회논문집
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• 제7권1호
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• pp.49-69
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• 2004

본 연구는 학생들의 수학 학력 저하를 조금이나마 막아보고자 교육과정의 일환인 특별보충과정을 통하여 부진 학생들이 수학에 대한 관심과 흥미를 가지고 자기주도적인 학습을 하는데 도움이 되도록 하기 위하여 학습자료 개발에 목적을 두고 시작하였다. 이에 따라 C중학교 2학년 특별보충과정 대상학생들의 2003학년도 1학기 중간 및 기말고사의 성적을 토대로 학습결손 영역을 분석한 후, 교과서 및 이미 개발된 학습자료를 수정$.$보완하여 7-가 단계의 내용과 연계성을 고려한 8-가 단계의 특별보충과정 학습자료를 개발하여 C중학교 2학년 특별보충과정에 적용하였다. 그 적용 후에 특별보충과정 학습자료에 대한 반응을 빈도 분석하여 알아보고, 진단평가를 실시한 후 각 영역별로 통과율 결과를 분석하여 특별보충과정 학습자료 개발의 미비한 부분 및 개선 방향을 알아봄으로써 학생들의 학력신장 방안을 모색하여 보고자 하였다.

• Structural Engineering and Mechanics
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• 제62권5호
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• pp.567-576
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• 2017

Structural failures are undesirable events that devastate the construction industry resulting in loss of life, injury, huge property loss, and also affect the economy of the region. Roof truss failures occur mainly due to excessive loading, improper fabrication, deterioration, inadequate repair, etc. Although very rare, a roof truss may even fail due to inappropriate location of supports. One such case was reported from the recent failure of a steel roof truss used in an indoor stadium at Kargil in India. Kargil region, being mountainous in nature, receives heavy snowfall and hence the steel roof trusses are designed for heavy snow loads. Due to inappropriate support location, the indoor stadium's steel roof truss had failed under heavy snow load for which it was designed and became an interesting structural engineering problem. The failure observed was primarily in terms of yielding of the bottom chord under the supports, leading to partial collapse of the roof truss. This paper summarizes the results of laboratory tests and analytical studies that focused on the validation of the proposed remedial measure for rehabilitating this distressed steel roof truss. The study presents the evaluation of (i) significant reduction in strength and stiffness of the distressed truss resulting in its failure, (ii) desired recovery in both strength and stiffness of the rectified truss contributed by the proposed remedial measure. Three types of models i.e., ideal truss model, as build truss model and rectified truss model were fabricated and tested under monotonic loading. The structural configuration and support condition varied in all the three models to represent the ideal truss, distressed truss and the rectified truss. To verify the accuracy of the experimental results, an analytical study was carried out and the results of this analytical study are compared with the experimental ones.

• 감성과학
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• 제8권1호
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• pp.37-45
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• 2005

본 논문에서는 H사와 공동으로 개발한 가정용 비만치료기의 특징과 치료효과를 측정, 분석한 것이다. 이 가정용 비만치료기는 중주파 활용, 온열벨트 사용과 함께 부작용을 최소화하도록 설계되었는데 성능평가를 위해 20대 여성 8명을 대상으로 1개월 간의 비만치료 실험을 실시하였다. 실험은 심폐기능운동검사를 통하여 피실험자들의 비만치료 실험 전후의 가스교환 반응도($VCO_2$와 $VCO_2$양의 변화)에 초점을 두었다. 실험결과 체중(${\cal}kg$), 체지방율($\%$), 체지방량(${\cal}kg$), 비만도($\%$), 기초대사량(kcal) 등에서 비만감소 효과가 나타났으며 비만치료 전보다 산소($VCO_2$) 섭취량은 증가한 반면 이산화탄소($VCO_2$) 배출량은 감소한 것으로 나타났다. 이는 인체의 생리학적측면과 운동 역학적인 측면이 상관관계가 높다는 것을 보여주고 있으며 여기서 개발된 비만치료기가 의학적으로 비만치료에 도움이 될 수 있음을 입증하는 결과라 할 수 있다.

• The Journal of Asian Finance, Economics and Business
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• 제8권2호
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• pp.571-582
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• 2021

Employers and employees are seriously suffering from perceived organizational politics exhibited in the workplace, and they are searching for remedial ways. The current study was carried out to measure the (i) effects of the employees' perceived organizational politics on their behavioral outcomes, and (b) the remedial role of employees' social astuteness in the relationship of their perceived organizational politics to behavioral outcomes (i.e., work engagement and turnover intention). Seven hundred and twenty-five employees working in Nepalese A graded banks were surveyed to collect the perceptual cross-sectional data. The data were quantitatively analyzed, adopting the deducting reasoning approach. Regression analysis revealed that (i) perceived organizational politics negatively impacted on work engagement and positively impacted on turnover intention, (ii) social astuteness moderated the relationship between perceived organizational politics and employees' behavioral outcome. Moreover, perceived organizational politics' detrimental impact was less severe for employees who possess high social astuteness as compared to those who have less social astuteness. The remedial effect of social astuteness was measured more useful for high organizational politics perceiver than for low perceiver. A number of theoretical and practical implications are suggested to improve the employees' behavioral outcomes from the detrimental impact of perceived corporate politics.

• ETRI Journal
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• 제36권3호
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• pp.396-406
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• 2014

We have designed and investigated a new congestion control scheme, called optimal and fully explicit (OFEX) controller. Different from existing relatively explicit controllers, this new scheme can provide not only optimal bandwidth allocation but also a fully explicit congestion signal to sources. It uses the congestion signal from the most congested link instead of the cumulative signal from the flow path. In this way, it overcomes the drawback of relatively explicit controllers exhibiting bias toward multi-bottlenecked users and significantly improves their convergence speed and source throughput performance. Furthermore, our OFEX-controller design considers a dynamic model by proposing a remedial measure against the unpredictable bandwidth changes in contention-based multi-access networks. Compared with former works/controllers, this remedy also effectively reduces the instantaneous queue size in a router and thus significantly improves queuing delay and packet loss performance. We have evaluated the effectiveness of the OFEX controller in OPNET. The experimental comparison with the existing relatively explicit controllers verifies the superiority of our new scheme.

• 수면정신생리
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• 제10권2호
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• pp.84-87
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• 2003

Drowsy driving is a major cause of automobile crashes and can lead to more serious injuries than other causes of traffic accidents. Factors increasing the risk of drowsy driving and related crashes include sleep loss, late night driving, untreated or unrecognized sleep disorders, use of sedating medications and consumption of alcohol. Young people, especially young males, shift workers, and people with untreated sleep apnea syndrome and narcolepsy are well known as the population groups at highest risk. To prevent drowsy driving and its consequences, getting adequate and quality sleep is both easier and much more successful than any remedial measure. Other helpful behaviors include avoidance of alcoholic beverages and limiting late night driving. Taking a short nap or consuming caffeine can make a short-term difference in driving alertness. In addition, information should be actively provided to the public about the importance of sleep disorders and their consequences. To reduce injuries and death caused by drowsy driving, it is a prerequisite to increase public awareness that drowsy driving can cause serious automobile crashes and has morbidity and mortality rates as high as those of drunk driving.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1993년도 Fifth International Fuzzy Systems Association World Congress 93
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• pp.1102-1105
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• 1993

A fuzzy expert system for prediction and mitigation of sludge bulking was developed for an activated sludge process which treats waste water from a food industry. The developed system is able not only to infer the degree of progress of sludge bulking but also to generate remedial operation guides which may be sent to the local controllers as remote set points. One of the important consequences through this study is the BI (Bulking Index) inferred by the bulking prediction expert system was found to have a close correlation with the SVI (Sludge Volume Index) which is a practical measure of degree of bulking but needs tedious chores for its measurement.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.1274-1281
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• 2010

Cut Slope Management System(CSMS) is a systematic maintenance and management system designed to prevent the collapse of cut slopes located along national roads and to minimize damages caused by slope collapse related accidents. In order to implement a maintenance and management system that will ensure safe road operation, the Korean government has started the inventory of cut slopes and developed a cut slope database since 2006. The study on the application of cut slope database is on-going and part of this study is the development of cut slope database management system (Slope-navi) using GIS technology and navigation system for the effective and efficient cut slope management using Information Technology. Using the Navigation Cut Slope Data Management System the previously developed database was checked and verified. The converted cut slope inventory data and field investigation reports of about 20,000 cut slopes were loaded in the navigation map. Through the development of the navigation's cut slope data search system, a systematic and efficient cut slope database management and operation in the prevention of slope collapse and remedial measure selection was established.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1529-1532
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• 2007

Failure Mode, Effects, and Criticality Analysis (FMECA) is an extension of FMEA which includes a criticality analysis. The criticality analysis is used to chart the probability of failure modes against the severity of their consequences. The result highlights failure modes with relatively high probability and severity of consequences, allowing remedial effort to be directed where it will produce the greatest value. However, there are several limitations. Measuring severity of failure consequences is subjective and linguistic. Since The result of FMECA only gives qualitative and quantitative informations, it should be re-analysed to prioritize critical units. Fuzzy set theory has been introduced by Lotfi A. Zadeh (1965). It has extended the classical set theory dramatically. Based on fuzzy set theory, fuzzy logic has been developed employing human reasoning process. IF-THEN fuzzy rule based assessment approach can model the expert's decision logic appropriately. Fault tree analysis (FTA) is one of most common fault modeling techniques. It is widely used in many fields practically. In this paper, a simple fault tree analysis is proposed to measure the severity of components. Fuzzy rule based assessment method interprets linguistic variables for determination of critical unit priorities. An rail-way transforming system is analysed to describe the proposed method.