• 한국소음진동공학회논문집
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• 제24권2호
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• pp.123-130
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• 2014

An ultrasonic magnetostrictive transducer-based phased-array system for imaging defects in plate structures is newly proposed. In that most ultrasonic phased array systems rely on piezoelectric transducers or electromagnetic acoustic transducers, this system has its own unique feature of employing magnetostrictive transducers. Interest in using a phased array system using magnetostrictive transducers has been recently reported for pipe inspection but no such system has been developed for plate inspection. In this investigation, we aim to propose a phased array system using OL-MPTs (Omnidirectional Lamb wave Magnetostrictive Patch Transducers) for plate inspection. The developed system consists of a multi-channel function generator, power amplifiers, preamplifiers and a data acquisition unit. In the process of its development, each of the units must be checked and in doing so, we suggest types of ultrasonic wave experiments that should be carried out. Finally, the phased system using a transducer array composed of eight OL-MPTs is newly configured and is applied for actual crack detection experiments.

• 감성과학
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• 제14권2호
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• pp.235-244
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• 2011

본 연구에서는 fMRI 기법을 활용하여 제품과 공감각적 은유가 적용된 제품 디자인에 표현된 미각적 요소와의 적합성 수준이 제품에 대한 신경학적 반응과 제품평가에 미치는 영향에 대하여 알아보고자 하였다. 사전조사를 통해 미각적 요소와 제품 간의 적합성 정도에 따라 제품디자인을 두 그룹으로 나누었다. 총 40개의 제품디자인이 실험자극물로 사용되었다. 총 15명의 건강한 오른손잡이 대학생들이 실험에 참가하였다. 실험은 총 2세션으로 구성되어 있고, fMRI scanning session에서 참가자들은 제품디자인을 관찰하였고, post-scanning session에는 제품디자인에 대한 선호도와 구매의도를 측정하였다. 실험결과 적합성이 높은 제품디자인이 낮은 제품디자인보다 선호도, 구매의도 모두 높게 나타났다. 뇌 반응의 경우 긍정적 보상과 관련된 미상핵(Caudate nucleus)과 피각(putamen) 영역이 적합성이 높은 조건의 제품디자인에서 더 많이 활성화 되는 것으로 나타났다.

• 한국측량학회지
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• 제15권1호
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• pp.97-105
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• 1997

최근가지는 건축물을 정확히 기록 보존하는 방법으로 실측에 의한 방법이 주로 이용되어 왔으나, 노력과 시간이 많이 소요되고 숙련도에 따라 정확도가 좌우되는 단점이 있다. 또한 최근에 이르러 정보산업의 급속한 발달로 지형정보체계의 자료기반구축 및 갱신에 있어서 빠르고 정확한 정보의 취득이 요구되는 실정이지만 기존의 방법으로는 신속·정확한 갱신이 어려운 실정이다. 따라서, 본 연구에서는 보다 간편하고 경제적이며 정확한 근거리 사진측량기법을 이용하여 건축물을 정밀관측하고, 획득된 영상을 다중영상접합기법을 이용하여 처리함으로써 3차원 수치모형을 생성하고자 한다. 또한 완성된 건축물의 입면, 평면등을 다중영상접합에 의해 정밀도화 할 수 있는 기법을 제시하고, 해석적 방법을 정립하여 각 부재의 정확한 치수와 3차원 좌표를 결정하므로써 필요시 건축물의 정확한 준공도면 등의 자료로 제공할 수 있도록 하는데 그 목적이 있다.

• 한국산학기술학회논문지
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• 제14권8호
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• pp.3925-3932
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• 2013

감성은 인간의 삶과 밀접한 관련을 가지고 있으며 이는 집중력, 학습능력 등 많은 부분에 영향을 주어 다양한 행동 패턴을 가지게 한다. 따라서 본 논문의 목적은 부정감성을 구분하기 위하여 생체신호를 기반으로 주요한 특징들을 추출하는 것이다. 이를 위해 본 논문에서는 심전도, 뇌파, 피부 온도와 피부전도도를 기반으로 생체신호를 측정한 후, 선형분류기와 유전 알고리즘의 조합으로 정확하고 신속한 알고리즘 개발하고, 주요 특징을 추출하였다. 그 결과, 알고리즘은 최대 96.4%의 정확도를 가짐을 확인할 수 있었고, 추출된 파라미터는 심박변이도의 Mean, RMSSD, NN50과 뇌파의 전두엽 영역에서의 ${\sigma}$파와 ${\alpha}$파의 주파수 파워, 두정엽 영역에서 ${\alpha}$파, ${\beta}$파, ${\gamma}$파와 의 주파수 파워, 그리고 피부온도의 평균과 표준편차 값이었다. 이에 따라 각 각의 생체신호를 기반으로 한 추출 된 특징들은 부정감성의 분류에 있어 중요한 역할을 함을 확인할 수 있었다.

• 한국콘텐츠학회논문지
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• 제16권9호
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• pp.739-750
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• 2016

가상현실 헤드셋에 대한 제어는 머리에 착용한 상태에서 손을 사용하기 때문에 조작에 대한 부담감이 발생한다. 본 논문에서는 손을 사용하지 않고 즉각적인 입력신호를 줄 수 있는 안전도(EOG, electro-oculogram)를 이용한 가상현실 헤드셋 입력시스템을 제안하였다. 이는 가상현실 헤드셋의 제어를 위한 입력 신호를 손의 움직임 없이 사용자의 안전도만으로 디스플레이 되는 콘텐츠를 제어할 수 있는 시스템이다. 제안된 시스템은 모바일 폰, 가상현실 헤드셋, 그리고 뇌전도 데이터 획득용 헤드셋으로 구성되어 있으며, 신호처리 및 제어를 위한 Unity3D 엔진을 이용하여 제어 시스템을 구현하였으며, 구현된 시스템을 통해 가상현실 헤드셋의 손쉬운 제어가 가능함을 확인하였다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.90-93
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• 2006

The first Geostationary Ocean Color Imager (GOCI) onboard its Communication Ocean and Meteorological Satellite (COMS) is scheduled for launch in 2008. GOCI includes the eight visible-to-near-infrared (NIR) bands, 0.5km pixel resolution, and a coverage region of 2500 ${\times}$ 2500km centered at 36N and 130E. GOCI has had the scope of its objectives broadened to understand the role of the oceans and ocean productivity in the climate system, biogeochemical variables, geological and biological response to physical dynamics and to detect and monitor toxic algal blooms of notable extension through observations of ocean color. The special feature with GOCI is that like MODIS, MERIS and GLI, it will include the band triplets 660-680-745 for the measurements of sun-induced chlorophyll-a fluorescence signal from the ocean. The GOCI will provide SeaWiFS quality observations with frequencies of image acquisition 8 times during daytime and 2 times during nighttime. With all the above features, GOCI is considered to be a remote sensing tool with great potential to contribute to better understanding of coastal oceanic ecosystem dynamics and processes by addressing environmental features in a multidisciplinary way. To achieve the objectives of the GOCI mission, we develop the GOCI Data Processing System (GDPS) which integrates all necessary basic and advanced techniques to process the GOCI data and deliver the desired biological and geophysical products to its user community. Several useful ocean parameters estimated by in-water and other optical algorithms included in the GDPS will be used for monitoring the ocean environment of Korea and neighbouring countries and input into the models for climate change prediction.

• 한국지역사회생활과학회지
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• 제24권2호
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• pp.251-258
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• 2013

Korean oil and honey Yukwa has been paid attention as formal cake for traditional national seasons' holiday and religious service. Quality of Yukwa, however, has been maintained arbitrarily by each Yukwa manufacturer. Since even same Yukwa had severe differences in size, weight, and pattern, it has given the negative effect to the consumer. Yukwa industries need to setup the quantitative quality specifications instead of qualitative ones to maintain the uniformity of Yukwa quality. Efficient and economical inspection and process control system should be developed. In developing quality standards of Yukwa, features which can measure quality quantitatively in real time should be properly chosen. Existing quality features such as acidity, oxidization, hardness, viscosity, and texture were measured by the chemical or physical base destructive methods. Many research and developments have been performed in investigating and analyzing chemical transition states of those quality features as environment or storage condition changes. Most methods, however, require either off-line or complex treatment or time consuming process of analysis in evaluating quality features. Consumer, however, selects products mostly based on the external features such as shape, size, and color. Therefore, critical visual quality features should be chosen and the efficient real time measurement system must be developed. In this paper, computer image acquisition and processing system were developed and software modules were developed to extract the quantitative data of those features in real-time. Computer image processing system will promote in maintaining uniform quality of Yukwa and establishing quality standards of Yukwa.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.267-268
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• 2002

Microbeam is a new avenue of radiation research especially in radiation biology and radiation protection. Selective irradiation of an ionizing particle to a targeted cell organelle may disclose such mechanisms as signal transaction among cell organelles and cell-to-cell communication in the processes toward an endpoint observed. Bystander effect, existence of which is clearly evidenced by application of the particle microbeam to biological experiments, suggests potential underestimation in the conventional risk estimation at low particle fluence rates, such as environment of space radiations in ISS (International Space Station). To promote these studies we started the construction of our microbeam facility (named as SPICE) to our HVEE Tandem accelerator (3.4 MeV proton and 5.1 MeV $^4$He$\^$2+/). For our primary goal, "irradiation of single particle to cell organelle within a position resolution of 2 micrometer in a reasonable irradiation time", special features are considered. Usage of a triplet Q magnet for focussing the beam to submicron of size is an outstanding feature compared to facilities of other institutes. Followings are other features: precise position control of cell dish holder, design of the cell dish, data acquisition of microscopic image of a cell organelle (cell nucleus) and data processing, a reliable particle detection, soft and hard wares to integrate all these related data, to control and irradiate exactly determined number of particles to a targeted spot.

• 한국세라믹학회지
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• 제39권8호
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• pp.735-741
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• 2002

미분탄 화력발전소에서 보일러의 부하를 변화시켰을 때 전기집진기에서 단별 채취한 fly ash에 대해서 디지털 이미지 분석을 이용하여 원형지수를 검토하였다. 원형지수 측정은 다음과 같은 다섯 단계, 즉 ① 이미지 획득, ② 이미지 전처리, ③ 검출, ④ 이미지 후처리, ⑤ 측정의 단계를 거쳐 이루어 졌다. Fly ash의 평균 원형지수는 0.78∼0.83의 범위를 나타냈으며, 같은 위치에 있는 호파에서 채취한 fly ash는 보일러의 부하에 관계없이 유사한 원형지수 값을 나타냈다. 그리고 첫 번째 호파에서 세 번째 호파로 갈수록, 즉 fly ash의 평균 입경이 작아질수록 원형지수는 증가하는 경향을 나타냈다.

• 한국의류산업학회지
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• 제8권2호
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• pp.183-190
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• 2006

The purpose of this study was to analyze social, economic and cultural phenomena of the luxury brand in the viewpoint that the consumption system of the modern society stood for the sign consumption and the industrial production of difference as Baudrillard mentioned in the Consumer Society. The result was divided into the two subjects popularization and differentiation of luxury brand. Firstly the meaning of luxury brand was that the personal effects of consumption of king or aristocratic class who did not exist in the modern and were made into the selection and consumption-possible things of exchange value. The popularization of this sign was accelerated through TV drama. Secondly as differentiation strategy of luxury brand, was made by giving meaning to the life style concept of the upper class with advertisement and design, and also the logo of design was used as sign differentiated from people. Also the reason why the producer of the luxury brand gave meaning to such life style was that the awareness of the brand which people have consistently makes them consume more products. The consumption system of the modern society stood for the sign consumption, difference sign mark value which was the desire on a social meaning basis, not the consumption of things as used value. And the consumer could express his personality by selecting and consuming the product of luxury brand model made with this sign. Accordingly the distribution, purchase, sales and acquisition of the things with this difference sign were our verbal activity and linguistic code today, and it was the essential feature of the society, culture and economy of the consumer society.