• 항공우주산업기술동향
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• 제6권2호
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• pp.90-98
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• 2008

최근 고해상도위성의 개발 및 활용이 활발해지면서, 데이터 전송 및 처리를 위한 영상압축의 중요성이 대두되고 있다. 이에 발맞추어 CCSDS (Consultative Committee for Space Data Systems)에서는 고해상도위성의 영상압축권 고안인 CCSDS 122.0-B-1을 2005년 말에 발표했으며, 이는 향후 고해상도 위성의 영상압축에 널리 적용될 것으로 기대된다. 본 논문에서는 고해상도위성의 최근 동향을 알아보고, CCSDS 122.0-B-1 기반의 고해상도위성 영상압축 기술에 대해 설명하며, JPEG과 성능을 비교한 결과를 기술한다.

• 한국정밀공학회지
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• 제30권2호
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• pp.177-184
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• 2013

This paper proposes an enhanced Simultaneous Localization and Mapping (SLAM) algorithm based on matching laser image and Extended Kalman Filter (EKF). In general, laser information is one of the most efficient data for localization of mobile robots and is more accurate than encoder data. For localization of a mobile robot, moving distance information of a robot is often obtained by encoders and distance information from the robot to landmarks is estimated by various sensors. Though encoder has high resolution, it is difficult to estimate current position of a robot precisely because of encoder error caused by slip and backlash of wheels. In this paper, the position and angle of the robot are estimated by comparing laser images obtained from laser scanner with high accuracy. In addition, Speeded Up Robust Features (SURF) is used for extracting feature points at previous laser image and current laser image by comparing feature points. As a result, the moving distance and heading angle are obtained based on information of available points. The experimental results using the proposed laser slam algorithm show effectiveness for the SLAM of robot.

• 패션비즈니스
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• 제6권2호
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• pp.17-28
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• 2002

With the most popular and beloved Verdi's "La Traviata" as the subject in the year 2001, which is the 100th anniversary of his death, the present study discusses the arias by the main character "Violetta" and the characteristics, images, clothes and their symbolism expressed through and stage costumes of major performances shown in Korea and abroad. Furthermore, the purposes of the present study are to propose a new fashion brand image called "Violetta look" by incorporating this image into current fashion to join fashion and stage, and to actually design and producing these clothes. Therefore, stage costumes of characters shown in the limited space called stage were connected with the study of characters' images and applied into the current fashion as a brand image, and from the industrial aspect, a high value added fashion brand image was created.

• Nuclear Engineering and Technology
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• 제51권6호
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• pp.1610-1615
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• 2019

Positron emission tomography (PET)/magnetic resonance (MR) scanning has the advantage of less additional exposure to radiation than does PET/computed tomography (CT). In particular, MR based attenuation correction (MR AC) can greatly affect the image quality of PET and is frequently obtained using various MR sequences. Thus, the purpose of the current study was to quantitatively compare the image quality between MR non-AC (MR NAC) and MR AC in PET images with three MR sequences. Percent image uniformity (PIU), percent contrast recovery (PCR), and percent background variability (PBV) were estimated to evaluate the quality of PET images with MR AC. Based on the results of PIU, 15.2% increase in the average quality was observed for PET images with MR AC than for PET images with MR NAC. In addition, 28.6% and 71.1% improvement in the average results of PCR and PBV respectively, was observed for PET images with MR AC compared with that with MR NAC. Moreover, no significant difference was observed among the average values using three MR sequences. In conclusion, the current study demonstrated that PET with MR AC improved the image quality and can be help diagnosis in all MR sequence cases.

• The Journal of Asian Finance, Economics and Business
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• 제8권3호
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• pp.585-593
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• 2021

The service industry has become the driving force of economic development in recent years. With the current fierce competitive situation, competing businesses have continually provided a superior quality of service, and an excellent perceived brand image to gain customer satisfaction and customer loyalty. This study's current purpose is to empirical research the linking between service quality, brand image, customer satisfaction, and customer loyalty. We collect research data from 299 consumers who bought goods at supermarkets in Ho Chi Minh City, Vietnam, using a convenient sampling technique. We proposed the conceptual model from prior studies and considered it in Vietnam's context. PLS-SEM was conducted to test the relationships in the conceptual model. We have estimated the scale's reliability by Cronbach's alpha values and composite reliability values. Moreover, we have evaluated discriminant validity by the Fornell-Larcker standard. The findings showed that service quality positively affects the brand image, customer satisfaction, and customer loyalty. Likewise, the results also confirmed brand image had a positive impact on customer satisfaction and customer loyalty. Moreover, the outcomes also disclosed that customer satisfaction had a positive relationship with customer loyalty. The research suggested implications for managers, limitations, and directions for future research from the above findings.

• 한국자기학회지
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• 제13권2호
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• pp.47-52
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• 2003

DC 마그네트론 스파터법과 RLSA(Radial Line Slot Antenna)을 이용한 마이크로파 여기 프라즈마를 이용하여 Ta/Cu/Ta/NiFe/Cu/Mn$_{75}$Ir$_{25}$/ $Co_{70}$Fe$_{30}$/Al-oxide 구조의 접합을 제조한 후, contact-mode AM(Atomic Force Microscope)을 이용하여 Al 산화막의 국소전도 특성의 평가를 수행하였다. AFM 동시전류측정으로부터, 얻어지는 표면상과 전류상은 대응하지 않는다. 국소 전류-전압(I-V)의 측정 결과, 전류상은 절연층의 barrier height의 분포를 나타내고 있다는 것을 알았다.다.다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 하계학술대회 논문집 Vol.6
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• pp.388-389
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• 2005

In this paper, the electric properties of mercury Iodide multi-layer samples has been investigated. We measured and analyzed their performance parameters such as the X-ray sensitivity and dark-current for a mercury Iodide multi-layer X-ray detector with a dielectric layer. The digital X-ray image detector can be constructed by integrating photoconduction multi-layer that dielectric layer has characteristics of low dark-current, high X-ray sensitivity. However this process has found to have complexity on the performance of the sample. We have investigate dielectric layer that it substitute dielectric layer for HgO(Mercury Oxide). We have employed two approaches for producing the mercury Iodide sample : 1) Physical Vapor Deposition(PVD) and 2) Particle-In-Binder(PIB). In this paper fabricated by PIB Method with thicknesses ranging from approximately 180um to 240um and we could produce high-quality samples for each technique particular application. As results, the dielectric materials such as HgO between the dielectric layer and the top electrode may reduce the dark-current of the samples. Mercury Iodide multi-layer having HgO has characteristics of low dark-current, high X-ray sensitivity and simple processing. So we can acquired a enhanced signal to noise ratio. In this paper offer the method can reduce the dark-current in the X-ray detector.

• 대한원격탐사학회지
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• 제16권3호
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• pp.199-209
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• 2000

본 연구에서는 기존의 형태추적법을 이용한 해양의 연속 AVHRR 위성화상자료 상의 유속추정 방법을 해양의 전선이나 소용돌이의 경계부를 정의하는데 있어 객관적 알고리즘을 이용하여 개선하였다. 그것을 위하여 Sobel 필터를 사용하였다. 이 Sobel 필터는 화상상의 객체의 가장자리를 추정하는데 대단히 효과적인 필터로서 판명되었다. Sobel 방법을 이용하여 가장자리를 정의한 후 그 가장자리 상에서 유속 백터를 추정하기 위하여 Pattem tile 과 Search tile 의 중심좌표를 선정할 필요가 있다. 본 연구에서 개발한 최대상관법을 이용한 형태추적법은 화상 전체를 이용할 필요 없이 객체가 정의된 부분화상을 이용하여 유속 벡터를 추정하기 때문에 훨씬 빠르고 효과적이었다. 동해에서 ADCP를 이용한 현장 관측자료와 비교하여 본 연구에서 개발한 방법의 타당성을 분석한 바로는 유속치에서 약 35% 이하 감소, 해류방향에서 약 $34^{\circ}$ 이하의 오차가 발생한 결과를 얻었다. 이는 기존의 결과와 비교할 때 향상된 결과로 평가된다.

• 대한지역사회영양학회지
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• 제4권4호
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• pp.554-560
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• 1999

This study was conducted to find adolescent females perception of body image. The survey was carried out by self-questionnaires with 463 female school and college students in Daegu. Analysis of data was done using t-test, and ANOVA with the SAS computer program. The average height, weight and BMI of the subjects were 161.2cm, 53.4kg and 20.51kg/$m^2$. It appeared that 33.3% of the subjects were off the normal range of body weight ; in particular 25.1% of the subjects were under weight. While the subjects’perception of their own current body image was not distorted, they were dissatisfied with their body image because they wanted a very thin figure. Subjects were divided into 3 groups -underweight, normal weight, overweight-according to their current body size. Their perceptions of ideal and desired figures differed significantly between the groups, but they thought a thinner figure than normal body image as ideal and desired body image even in overweight group. As a result, dissatisfaction of body image in the overweight group was significantly larger than the normal-weight group, and that of the normal-weight group was larger than the underweight group. Percentages of weight control attempt were 51.7% and 64.7% in the normal weight and underweight subjects, respectively. Subjects were divided into 2 groups according to their weight control experience : those who have attempted, and who have not attempted. Weight control attemptees had a higher level of dissatisfaction with their body image than non-attemptees, both because weight control attemptees were fatter, and they perceived a thinner figure as an ideal and as a desired body image thin non-attemptees. From the results of this study, we confirmed that one of reasons of excessive weight control behavior among adolescent females was distorted perception about ideal body image.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.525-528
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• 2009

Recently, image classification has been an important task in various fields. Generally, the performance of image classification is not good without the adjustment of image features. Therefore, it is desired that the way of automatic feature extraction. In this paper, we propose an image classification method which adjusts image features automatically. We assume that texture features are useful in image classification tasks because natural images are composed of several types of texture. Thus, the classification accuracy rate is improved by using distribution of texture features. We obtain texture features by calculating image features from a current considering pixel and its neighborhood pixels. And we calculate image features from distribution of textures feature. Those image features are adjusted to image classification tasks using Genetic Algorithm. We apply proposed method to classifying images into "head" or "non-head" and "male" or "female".