• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.820-823
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• 2007

In the wavenumber domain, each point on a radiation sphere indicates a plane wave of the frequency corresponding to radius of the sphere and the position on the sphere shows propagating direction of the plane wave. This concept is extended from the research by Choi[1] where he focus acoustic potential energy at a point on a radiation sphere. Here we propose the method to focus the energy at a point on the radiation sphere, as a result, we can easily generate a plane wave which propagates to any direction that we want.

• Asian Pacific Journal of Cancer Prevention
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• 제13권5호
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• pp.1719-1722
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• 2012

The Wiskott-Aldrich Syndrome Protein family Verprolin - homologous proteins (WAVEs), encoded by a metastasis promoter gene, play considerable roles in adhesion of immune cells, cell proliferation, migration and destruction of foreign agents by reactive oxygen species. These diverse functions have lead to the hypothesis that WAVE proteins have multi-functional roles in regulating cancer invasiveness, metastasis, development of tumor vasculature and angiogenesis. Differentials in expression of WAVE proteins are associated with a number of neoplasms include colorectal cancer, hepatocellular cancer, lung squamous cell carcinoma, human breast adenocarcinoma and prostate cancer. In this review we attempt to unify our knowledge regarding WAVE proteins, focusing on their potentials as diagnostic markers and molecular targets for cancer therapy.

• 문화기술의 융합
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• 제5권2호
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• pp.201-206
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• 2019

본 연구는 한국 드라마, 음악, 영화 등 한류콘텐츠를 중심으로 인도네시아 시장 진출을 위한 방안을 살펴보고자 한다. 이를 위해 인도네시아 현지인들이 한류콘텐츠를 좋아하는 이유, 소비 경로, 한류콘텐츠에 대한 호감도와 그 효과에 대해서 실증적으로 알아보았다. 연구결과, 한류콘텐츠의 인기 이유는 콘텐츠 자체의 품질과 해당 콘텐츠의 인적 매력도 등으로 확인되었다. 그리고 소비경로는 주로 TV를 통해 이루어졌으며, 한류콘텐츠의 호감도는 한국에 대한 호감도 및 한국에 대한 방문의도에 긍정적인 영향을 미치는 것으로 나타났다.

• 대한전자공학회논문지TC
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• 제47권2호
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• pp.67-73
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• 2010

반사판을 이용하여 은닉물체 탐지에 적용이 가능한 밀리미터파 수동 이미징 시스템을 제작 하였다. 94GHz 중심주파수 대역에서 밀리미터파 센서와 밀리미터파 신호를 집속하기 위한 렌즈 및 반사판을 구동하기 위한 구동장치를 설계 제작하였다. 밀리미터파 센서로부터 출력된 DC 신호는 저역통과 필터를 거쳐 DC 증폭 후에 ADC/DAQ를 이용하여 디지털 신호로 변환된다. 컴퓨터에서는 디지털 신호의 영상처리를 통해 $18{\times}64$ 화소의 해상도로 밀리미터파 수동 이미지를 획득한다. 시험 결과 제작된 시스템을 이용하여 사람과 은닉물체의 감지 영상을 얻을 수 있었다.

• 대한전자공학회논문지
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• 제21권4호
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• pp.65-71
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• 1984

초음파 B스캔너의 경우 광대역 펄스를 사용하기 때문에 광학에서 사용되는 집속 계산식으로는 초음파 집속 시스템을 정확하게 설계할 수 없다. 본 연구에서는 초음파 다중소자에 광대역 펄스가 여기될 때 초음파의 전파모양을 정확하게 계산할 수 있늘 방법이 연구되었다. 계간된 초음차의 전파 모양을 이용하여 고해상력을 갖는 다이나믹 집속(dynamic focusing)시스템의 구동소자수, 집속치로 지연값 및 집속점 위치등을 설계하도록 하였다. 저잡음 스튀칭 특성을 갖는 다이나믹 집속 시스템을 구성하여 실험에 의해 3.5MHz선형소자로써 18cm의 깊이까지 2∼3mm의 해상도가 얻어짐을 확인하였다.

• 동아시아경상학회지
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• 제6권4호
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• pp.25-34
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• 2018

Purpose - The purpose of this study is to investigate the effect of Korean Wave on consumer intentions by adjusting the Korean image and image of Korean company to counterbalance the hostility through the control effect of Korean Wave. Research design and methodology - This paper measure individual and national hostility and suggest that the effect of the adjustment of Korean culture satisfaction on corporate image, product image and consumer's purchase intention. Results - This study suggests the subjects to be studied empirically by presenting research themes and models, but it is necessary to verify the model through statistical verification since it is not verified empirically. In addition, it is necessary to further control factors and identification of anti-marginal or anti-marginal products. Conclusions - This study suggests research topics that investigate how hostility affects Korean Wave in consideration of the current special situation, while conventional researches mainly focus on ethnocentrism and patriotism. In this way, this study suggests research direction that helps to enhance corporate image and product image by eliminating hostility and actively utilizing Korean Wave. The Proposal will be helpful to provide a frame for empirical analysis in future and to develop strategic means to further utilize it in international marketing.

• 대한조선학회논문집
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• 제58권6호
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• pp.382-390
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• 2021

The present study suggests the application of a depth camera for wave height field measurement, focusing on the calibration procedure and test setup. Azure Kinect system is used to measure the water surface elevation, with a field of view of 800 mm × 800 mm and repetition rate of 30 Hz. In the optimal optical setup, the spatial resolution of the field of view is 288 × 320 pixels. To detect the water surface by the depth camera, tracer particles that float on the water and reflects infrared is added. The calibration consists of wave height scaling and correction of the barrel distortion. A polynomial regression model of image correction is established using machine learning. The measurement results by the depth camera are compared with capacitance type wave height gauge measurement, to show good agreement.

• Smart Structures and Systems
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• 제33권1호
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• pp.41-53
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• 2024

Grouting sleeves are an essential connecting component of prefabricated components, and the quality of grouting has a significant influence on structural integrity and seismic performance. The embedded grouting sleeve (EGS)'s grouting defects are highly undetectable and random, and no effective monitoring method exists. This paper proposes an ultrasonic guided wave method and provides a set of guidelines for selecting the optimal frequency and suitable period for the EGS. The optimal frequency was determined by considering the group velocity, wave structure, and wave attenuation of the selected mode. Guided waves are prone to multi-modality, modal conversion, energy leakage, and dispersion in the EGS, which is a multi-layer structure. Therefore, a time-reversal (TR)-based multi-mode focusing and dispersion automatic compensation technology is introduced to eliminate the multi-mode phase difference in the EGS. First, the influence of defects on guided waves is analyzed according to the TR coefficient. Second, two major types of damage indicators, namely, the time domain and the wavelet packet energy, are constructed according to the influence method. The constructed wavelet packet energy indicator is more sensitive to the changes of defecting than the conventional time-domain similarity indicator. Both numerical and experimental results show that the proposed method is feasible and beneficial for the detection and quantitative estimation of the grouting defects of the EGS.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 추계학술대회 논문집
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• pp.715-722
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• 2012

A structural health monitoring (SHM) technique for locating impact position in a composite plate is presented in this paper. The technique employs a single sensor and spatial focusing properties of time reversal (TR) and inverse filtering (IF). We first examine the focusing effect of back-propagated signal at the impact position and its surroundings through simulation. Impact experiments are then carried out and the localization images are found using the TR and IF signal processing, respectively. Both techniques provide accurate impact location results. Compared to existing techniques for locating impact or acoustic emission source, the proposed methods have the benefits of using a single sensor and not requiring knowledge of material properties and geometry of structures. Furthermore, it does not depend on a particular mode of dispersive Lamb waves that is frequently used in the SHM of plate-like structures.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2009년도 추계학술대회 논문집
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• pp.215-216
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• 2009