• 한국항만경제학회지
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• 제30권1호
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• pp.57-71
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• 2014

항만이 선사를 비롯한 항만 이용자들에게 제공하는 정보는 업무 수행을 위한 필수적인 정보들로서 매우 중요한 가치를 지니고 있다. 따라서, 항만이 제공하는 정보서비스 역시 항만이 선사에게 제공하는 중요한 서비스 중 하나에 해당되나, 이와 관련한 연구는 매우 부족한 실정이다. 본 연구는 이러한 점에 주목하여, 항만물류 정보서비스의 만족도를 분석하는 것을 목적으로 수행되었다. 연구의 목적을 달성하기 위해, 선행연구를 바탕으로 16개의 평가항목으로 구성된 평가기준을 확립하고, 만족도의 수준을 일목요연하게 파악할 수 있는 만족도 지수체계를 구축하였다. 분석결과, 부산항 이용자들의 정보서비스의 만족도 지수는 61.9로 나타났다. 또한, 3가지 평가영역 모두가 63이하로 나타나, 정보서비스 전반에 관한 개선책 수립이 필요하다는 점을 지적하였다. 끝으로, 분석결과를 바탕으로 추적조사를 실시한 결과, 정보처리의 신속성과 통합된 정보의 제공의 측면에 있어, 부산항의 정보서비스가 취약점을 가지고 있는 것으로 나타났다.

• 디지털융복합연구
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• 제19권2호
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• pp.169-174
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• 2021

효과적인 정보보안관리의 핵심요소인 정보보안 정책의 중요성이 고조되는 가운데, 조직 구성원의 보안정책 준수 여부에 영향을 미치는 요인에 대하여 다양한 이론에 기반한 실증연구가 다수 수행되었다. 억제이론은 사용자의 보안행동을 설명하는 연구에서 널리 사용되었다. 그러나, 여러 연구들이 일관적이지 않거나 서로 상충되는 결과를 보여 주었다. 이에 따라, 기존의 연구결과를 종합하는 연구들이 수행되었으나, 정성적인 문헌검토 차원이거나 개별 효과크기에 대한 단순한 정량적 분석에 그쳐 억제이론의 전반적인 모형을 대상으로 기존 연구결과를 종합적으로 분석하는 메타분석의 필요성이 대두되었다. 본 연구는 28편의 기존연구를 대상으로 다변량 메타분석의 일종인 TSSEM 기법을 R 기반의 metaSEM 패키지를 활용하여 분석하였다. 무선효과모형을 활용한 분석결과, 전반적인 억제이론 모형의 적합성은 만족스러운 수준이었으며, 억제이론을 구성하는 공식적인 세 가지 요인인 처벌의 확실성, 엄격성 및 신속성 모두 유의하게 나타났다. 향후 연구에서는 비공식적 억제요인에 대한 추가적인 분석과 함께 상황적 변수를 조절변수로 고려할 필요가 있다.

• 한국멀티미디어학회논문지
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• 제22권12호
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• pp.1415-1429
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• 2019

Nowadays object tracking process becoming one of the most challenging task in Computer Vision filed. A CSR-DCF (channel spatial reliability-discriminative correlation filter) tracking algorithm have been proposed on recent tracking benchmark that could achieve stat-of-the-art performance where channel spatial reliability concepts to DCF tracking and provide a novel learning algorithm for its efficient and seamless integration in the filter update and the tracking process with only two simple standard features, HoGs and Color names. However, there are some cases where this method cannot track properly, like overlapping, occlusions, motion blur, changing appearance, environmental variations and so on. To overcome that kind of complications a new modified version of CSR-DCF algorithm has been proposed by integrating deep learning based object detection and CSRT tracker which implemented in OpenCV library. As an object detection model, according to the comparable result of object detection methods and by reason of high efficiency and celerity of Faster RCNN (Region-based Convolutional Neural Network) has been used, and combined with CSRT tracker, which demonstrated outstanding real-time detection and tracking performance. The results indicate that the trained object detection model integration with tracking algorithm gives better outcomes rather than using tracking algorithm or filter itself.

• 한국해양공학회지
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• 제31권1호
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• pp.36-46
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• 2017

Most of the studies on the hydraulic characteristics of wave-current interaction have used 2-D hydraulic experiments or 2-D numerical simulations. However, it is difficult to understand the wave-current interaction found in actual estuaries using these. Therefore, a numerical water tank was constructed in this study to perform simulations involving a 3-D river mouth. The result showed a change in the water surface at the river mouth from the wave-current interaction. With an increase in the ratio ($V_c/C_i$) between the river current and wave celerity, the wave height and mean water level of the river increased at the wave and current meeting point. A higher $V_c/C_i$ caused a stronger wave-current interaction and increased the turbulence kinetic energy. Thus, the wave height attenuation became larger by the wave-current interaction with a higher $V_c/C_i$. In addition, it was possible to understand the flow characteristics in the vicinity of the river mouth as a result of the wave-current interaction using the mean flow and mean time-averaged velocity at the mid-cross section of river.

• 한국농공학회지
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• 제18권2호
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• pp.4116-4120
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• 1976

With the use of many rivers increased nearly to the capacity, the need for information concerning daily quantities of water and the total annual or seasonal runoff has became increased. A systematic record of the flow of a river is commonly made in terms of the mean daily discharge Since. a single observation of stage is converted into discharge by means of rating curve, it is essential that the stage discharge relations shall be accurately established. All rating curves have the looping effect due chiefly to channel storage and variation in surface slope. Loop rating curves are most characteristic on streams with somewhat flatter gradients and more constricted channels. The great majority of gauge readings are taken by unskilled observers once a day without any indication of whether the stage is rising or falling. Therefore, normal rating curves shall show one discharge for one gauge height, regardless of falling or rising stage. The above reasons call for the correction of the discharge measurements taken on either side of flood waves to the theoretical steady-state condition. The correction of the discharge measurement is to consider channel storage and variation in surface slope. (1) Channel storage As the surface elevation of a river rises, water is temporarily stored in the river channel. There fore, the actual discharge at the control section can be attained by substracting the rate of change of storage from the measured discharge. (2) Variation in surface slope From the Manning equation, the steady state discharge Q in a channel of given roughness and cross-section, is given as {{{{Q PROPTO SQRT { 1} }}}} When the slope is not equal, the actual discharge will be {{{{ { Q}_{r CDOT f } PROPTO SQRT { 1 +- TRIANGLE I} CDOT TRIANGLE I }}}} may be expressed in the form of {{{{ TRIANGLE I= { dh/dt} over {c } }}}} and the celerity is approximately equal to 1.3 times the mean watrr velocity. Therefore, The steady-state discharge can be estimated from the following equation. {{{{Q= { { Q}_{r CDOT f } } over { SQRT { (1 +- { A CDOT dh/dt} over {1.3 { Q}_{r CDOT f }I } )} } }}}} If a sufficient number of observations are available, an alternative procedure can be applied. A rating curve may be drawn as a median line through the uncorrected values. The values of {{{{ { 1} over {cI } }}}} can be yielded from the measured quantities of Qr$.$f and dh/dt by use of Eq. (7) and (8). From the 1/cI v. stage relationship, new vlues of 1/cI are obtained and inserted in Eq. (7) and (8) to yield the steady-state discharge Q. The new values of Q are then plotted against stage as the corrected steadystate curve.