• 한국도로학회논문집
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• 제19권5호
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• pp.131-141
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• 2017

PURPOSES : The main distress of asphalt pavements in monsoon climate regions are caused by water damage and plastic deformation due to repeated rain season and increased heavy vehicle traffic volume. In this study, the mechanical properties of polymer-modified warm mix asphalt (PWMA) materials are evaluated to use in monsoon climate regions such as Indonesia. METHODS : Comprehensive laboratory tests are conducted to evaluate moisture resistance and permanent deformation resistance for three different asphalt mixtures such as the Indonesian conventional hot-mix asphalt (HMA) mixture, the polymer-modified asphalt mixture, and the polymer-modified warm mix asphalt (PWMA) mixture. Dynamic immersion test and indirect tensile strength ratio test are performed to evaluate moisture resistance. The wheel tracking test is performed to evaluate rutting resistance. Additionally, the Hamburg wheel tracking test is performed to evaluate rutting and moisture resistances simultaneously. RESULTS :The dynamic immersion test results indicate that the PWMA mixture shows the highest resistance to moisture. The indirect tensile strength ratio test indicates that TSR values of PWMA mixture, Indonesian PMA mixture, and Indonesian HMA mixture show 87.2%, 84.1%, and 67.9%, respectively. The wheel tracking test results indicate that the PWMA mixture is found to be more resistant to plastic deformation than the Indonesian PMA. The dynamic stability values are 2,739 times/mm and 3,150 times/mm, respectively. Moreover, the Hamburg wheel tracking test results indicate that PWMA mixture is more resistant to plastic deformation than Indonesian PMA and HMA mixtures. CONCLUSIONS :Based on limited laboratory test results, it is concluded that rutting resistance and moisture susceptibility of the PWMA mixture is superior to Indonesian HMA and Indonesian PMA mixtures. It is postulated that PWMA mixture would be suitable for climate and traffic conditions in Indonesia.

• 한국화재소방학회논문지
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• 제23권2호
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• pp.62-66
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• 2009

본 연구는 국내에서 사용되고 있는 누전차단기 외함 절연재료의 소손 특성에 대하여 연구하였다. 시료는 3개 제조사의 누전차단기 외함 절연재료를 사용하였으며, 시료의 열분해특성, 연소특성, 트래킹 특성 등을 비교 분석하였다. 열분해특성은 TGA를 사용하였으며, 연소특성은 ISO5660(Fire Tests - Reaction to Fire, part 1)을 만족하는 Mass Loss Calorimeter(FTT 사)를 사용하였고, 트래킹 특성은 고체 절연재료의 내트래킹 및 비교트래킹 지수를 측정하는 실험인 KSC IEC 60112.의 기준에 따라 분석하였다. 연구결과 A제조사의 경우 내트래킹성이 가장 우수하였고, B제조사의 경우 내트래킹성이 가장 낮은 반면 $350^{\circ}C$ 이상의 고온에서 열안정성이 가장 우수하였으며, C제조사의 경우 $400^{\circ}C$ 이하의 온도에서 열안정성이 가장 우수한 것을 알 수 있었다.

• 한국전기전자재료학회논문지
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• 제33권2호
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• pp.135-140
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• 2020

An experimental study was conducted using the tracking wheel test (IEC 62217) method for evaluating the performance of insulator materials, in particular ethylene propylene diene monomer (EPDM) and silicone rubber. In addition, we studied the tracking characteristics resulting from applying the same method for the shape of the insulator housing, that is, the performance of regular and alternating sheds. The evaluation parameters were leakage current, surface characteristics, SEM, EDX, hydrophobicity, and temperature distribution; likewise, we applied the commercial frequency dry (and wet) flashover voltage test. We found that the regular shed had a greater leakage current than the alternating shed and that the recovery of the hydrophobicity in terms of rest time was greater than that of the EPDM in terms of leakage current. All of the regular-shed insulators of silicone rubber had tracking traces and choking on the sheath parting line, while the alternating shed showed only choking at the interface but no tracking traces. Therefore, it can be concluded that the commercial frequency wet flashover voltage of the silicone rubber with regular shed before and after the tracking wheel test is higher than that of the alternating shed.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권4호
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• pp.1066-1079
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• 2023

Multi-target tracking based on the detector is a very hot and important research topic in target tracking. It mainly includes two closely related processes, namely target detection and target tracking. Where target detection is responsible for detecting the exact position of the target, while target tracking monitors the temporal and spatial changes of the target. With the improvement of the detector, the tracking performance has reached a new level. The problem that always exists in the research of target tracking is the problem that occurs again after the target is occluded during tracking. Based on this question, this paper proposes a DeepSORT model based on SIFT features to improve ship tracking. Unlike previous feature extraction networks, SIFT algorithm does not require the characteristics of pre-training learning objectives and can be used in ship tracking quickly. At the same time, we improve and test the matching method of our model to find a balance between tracking accuracy and tracking speed. Experiments show that the model can get more ideal results.

• 대한지역사회작업치료학회지
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• 제3권2호
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• pp.25-32
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• 2013

목적 : 본 연구는 일반노인에게 시각적 피드백에 따른 발목 움직임 조절 도구를 사용하여 자가 운동을 시행하였을 때 노인의 발목 움직임 조절과 균형능력에 미치는 영향을 알아보고자 하였다. 연구방법 : 이 연구는 사례 연구(case-study)로써, 사전-사후 검사를 실시하였다. 80세인 일반 여성 노인에게 2주 동안 매일 오전, 오후 20분 동안 자가 운동을 실시하였다. 사전, 사후 검사로는 발목 조절 움직임 평가를 위한 Tracking 검사, 균형 능력 측정을 위한 한발로 서기 시간 측정과 Timed up-And-Go검사를 시행하였다. 결과 : 대상자는 Tracking 검사에서 발목 조절 움직임의 향상을 보였다. 균형 능력 평가에서는 한발로 서기유지 시간은 증가하였으나, Timed up-And-Go검사는 변화가 없었다. 결론 : 시각적 피드백에 따른 발목 조절 움직임 도구를 이용한 자가 운동은 노인의 발목 움직임 조절과 균형을 향상 시켰다.

• 한국도로학회논문집
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• 제19권2호
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• pp.25-34
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• 2017

PURPOSES: The purpose of this paper is to evaluate interface performance while using various tack coat materials for asphalt overlay. METHODS : The evaluation was conducted with tracking test, permeability, and interface bond strength. Tracking test was conducted using an image processing technique, to investigate the susceptibility of the tack coat materials. BBS and pull-off test were conducted to evaluate bond strength. The permeability test was conducted to evaluate the effect of tack coat materials. RESULTS : Results reveal that the trackless tack coat material demonstrates less tracking compared to other materials. Moreover, both BBS and pull-off tests can effectively evaluate the bond strength at the interface. RSC-4 was measured less bond strength. Moreover, tack coat prevents water penetration through the surface and aids the extension of the surface life of asphalt pavement. CONCLUSIONS : Trackless tack coat demonstrated a high and consistent bond strength performance. The tack coat types demonstrate marginally different performance as function of curing times. Field applicability was tested based on visual observation. Therefore, these should be considered when trackless tack coat is slightly enhanced the pavement performance based on limited this study results. Finally, it is necessary to allow reasonable time for the tack coat to completely cure.

• 한국군사과학기술학회지
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• 제12권3호
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• pp.354-359
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• 2009

In this paper, the Autocoast algorithm is proposed for EOTS to overcome the target occlusion status. Coast mode, one of tracking modes, is to maintain the servo slew rate with the tracking rate right before the loss of track. The Autocoast algorithm makes decision of entering coast mode by the prediction of target occlusion and tries to refind target after the coast time. This algorithm composes of 3 steps, the first step is the prediction process of the occlusion by target-like background, the second one is the check process of the occlusion happened after background intensity variation, and the last one is the process of refinding target. The result of computer simulation, test under laboratory, and real test with EOTS shows the applicability for the automatic video tracking system.

• 한국산학기술학회논문지
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• 제11권1호
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• pp.250-256
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• 2010

본 연구에서는 차량-교량간의 상호작용 효과가 교량의 동적거동에 미치는 영향을 분석하기 위하여 실험적 연구를 수행하였다. 이를 위하여 차량-교량 간 상호작용이 가능하도록 윤하중 실험 장치를 개발하여 단순교량 형식의 교량을 대상으로 이동 질량 실험을 수행하였다. 이동질량 이론을 이용한 해석 결과와 이동질량 실험의 결과를 상호분석하여 각각의 합리성을 검증하였다. 수행된 실험의 결과를 분석하여 개발된 윤하중 시험기는 차량-교량 간 상호작용에 의한 교량의 동적 거동을 재현할 수 있음을 알았다. 아울러 이동질량 실험의 결과를 분석하여 차량-교량 간 상호작용이 교량의 동적거동에 미치는 영향을 분석할 수 있었다.

• 한국도로학회논문집
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• 제7권2호
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• pp.97-107
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• 2005

반복주행시험에서 얻은 침하깊이와 동적안정도는 아스팔트 혼합물의 소성변형 저항성 평가를 위하여 널리 사용되고 있다. 하지만 바퀴의 재질에 따라 다르게 얻어지는 실정이다. 따라서 본 연구는 반복주행시험시 핵심요소라 할 수 있는 바퀴의 재질에 대하여 연구하였다. 이를 위하여 2종류(7.5mm, 15mm)의 고무바퀴와 고무를 씌우지 않은 강재(Steel)바퀴 한 종류를 사용하였으며, 반복주행시험을 통하여 바퀴재질에 따른 혼합물의 소성변형 저항성을 평가하였다. 또한 반복주행시험에서 얻은 침하깊이와 동적안정도를 Kim test의 변형강도와의 상관성 분석을 통하여 반복주행 시험용 최적 바퀴를 선정하는데 이용하였다. 고무두께가 15mm, 7.5mm, 0mm에 대한 상관성 분석결과 각각 0.7, 0.8. 0.9 이상이 나와 고무를 사용하지 않은 강재바퀴가 변형강도와의 상관성이 가장 높은 값을 보여주어 향후 반복주행시험시 강재바퀴의 사용이 소성변형을 예측하는데 가장 유리 할 것으로 판단된다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 추계학술대회 논문집
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• pp.391-394
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• 2000

EPDM/silicone blend was prepared with polyorganosiloxane compatibilizer for out-door polymer insulation used to shed. Each blend had various weight ratios, 100/0, 90/10, 70/30, 50/50, 30/70, 10/90, and 0/100 as EPDM to silicone, and electrical and tracking characteristics were studied with the method of IEC 60587. And also, tracking properties and contact angle related to UV-weathering period were studied to understand the degree of degradation of blend after 1000 h UV-weathering.