• Journal of Multimedia Information System
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• 제1권1호
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• pp.77-85
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• 2014

Usually, the skin pigmentation detection and diagnosis are made by clinicians. In this process it is subjective and non-quantitative. We develop an approach to detect and measure the different pigmentation lesions base on computer vision technology. In the paper we study several usually used skin-detecting color space like HSV, YCbCr and normalized RGB. We compare their performance with illumination influence for detecting the pigmentation lesions better. Base on a relatively stable color space, we propose an approach which is RGB channels vector difference characteristic for the detection. After the object region detection, we also use the difference to measure the difference between the lesion and the surrounding normal skin. From the experiment results, our approach can effectively detect the pigmentation lesion, and perform robustness with different illumination.

• 융합신호처리학회논문지
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• 제14권1호
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• pp.13-20
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• 2013

A combined DWT and DCT based watermarking technique of low frequency watermarking with weighted correction is proposed. The DWT has excellent spatial localization, frequency spread and multi-resolution characteristics, which are similar to the theoretical models of the human visual system (HVS). The DCT based watermarking techniques offer compression while DWT based watermarking techniques offer scalability. These desirable properties are used in this combined watermarking technique. In the proposed method watermark bits are embedded in the low frequency band of each DCT block of selected DWT sub-band. The weighted correction is also used to improve the imperceptibility. The extracting procedure reverses the embedding operations without the reference of the original image. Compared with the similar approach by DCT based approach and DWT based approach, the experimental results show that the proposed algorithm apparently preserves superiori mage quality and robustness under various attacks such as JPEG compression, cropping, sharping, contrast adjustments and so on.

• 융합신호처리학회논문지
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• 제8권3호
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• pp.199-204
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• 2007

This paper presents design of interleave configured dc-dc converter for high power distributed power system applications. The multi channel interleaving buck converter with small inductance has proved to be suitable for micro-grid, requiring medium output voltages, high output currents and fast transient response. Integrated magnetic components are used to reduce the size of the converter and improve efficiency. Unlike conventional methods, the distributed approach requires no centralized control, automatically accommodates varying numbers of converter cells, and is highly tolerant of subsystem failures. A general methodology for achieving distributed interleaving is proposed, along with a specific implementation approach. The design and simulation verification of switching frequency 10 kHz system is presented with interleaved clocking of the converter cells. The simulation (simulated by PSIM 6.1) results corroborate the analytical predictions and demonstrate the tremendous benefits of the distributed interleaving approach.

• 한국산업융합학회 논문집
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• 제24권4_1호
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• pp.397-409
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• 2021

This study proposes a new approach to implimentation of robust control and torque control response analysis based on monitoring simulator for smart factory. According to the physical properties of a flexible manipulator, a two time-scale approach, namely, singular perturbation ap proach, is further utilized for thorough analysis and general controller design. It is shown that asymptotic motional tracking can be effectively achieved, whereas the force regulation errors can be made arbitrarily small. For demonstration of the proposed technology performance, experiments of a eight joint flexible manipulator are performed for the proposed control method, and the reliability of proposed control results are illustrated based on monitoring simulator.

• 스마트미디어저널
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• 제12권9호
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• pp.45-59
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• 2023

Weakly supervised object localization (WSOL) is a task of localizing an object in an image using only image-level labels. Previous studies have followed the conventional class activation mapping (CAM) pipeline. However, we reveal the current CAM approach suffers from problems which cause original CAM could not capture the complete defects features. This work utilizes a convolutional neural network (CNN) pretrained on image-level labels to generate class activation maps in a multi-scale manner to highlight discriminative regions. Additionally, a vision transformer (ViT) pretrained was treated to produce multi-head attention maps as an auxiliary detector. By integrating the CNN-based CAMs and attention maps, our approach localizes defective regions without requiring bounding box or pixel-level supervision during training. We evaluate our approach on a dataset of apple images with only image-level labels of defect categories. Experiments demonstrate our proposed method aligns with several Object Detection models performance, hold a promise for improving localization.

• 한국융합학회논문지
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• 제13권4호
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• pp.195-201
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• 2022

21세기 화두인 4차 산업혁명의 핵심은 최첨단으로 발전하고 있는 다양한 기술들의 융합에 있다. 따라서 다양한 관점에서의 문제해결을 위해 융합 교육은 필수적이라 할 수 있다. 무엇보다 미래사회의 인간과 기술의 접점에서 발생하는 복합문제를 해결하기 위해서는 인문학적, 예술적 접근을 통한 통찰력이 필요하다고 보았다. 이제 대학은 새로운 디지털 환경에 적응하기 위해 다 학적으로 종합설계를 운영하려 하고 있다. 본 연구에서는 연구자가 운영한 예술을 접목한 공학 종합설계 교과목의 운영사례를 기술하였다. 연구자는 1. 문제 인식 및 정의, 2. 아이디어 도출 및 평가, 3. 프로젝트 개발, 4. 발표 및 시연의 프로세스 운영방식을 적용하여 종합설계 교과목에서의 예술 융합형 교육과정을 제시하였다. 본 연구를 통해 학생들에게 프로젝트 개발에 있어 예술적 심미안과 감성적 접근을 시도하게 함으로써 공학 계열 종합설계 교과목에서의 예술 융합 운영방식을 제시하였다는 데 의의가 있다.

• 디지털융복합연구
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• 제9권1호
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• pp.61-70
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• 2011

Ultimately, this research will focus on the activity traits of future customers in the convergence age. To accomplish that, firstly, researcher develop measures for assessing the convergence level of digital devices and digital services. Next, this will investigate the behavioral traits of people who use specific devices or services on the internet or mobile networks. This study proposed five convergence measures each for devices and services. For digital devices, measures such as converged functions, accessibility to network, portability, immediate communicability, and expandibility of functions were utilized. For digital measures such as scope of users, newness, social network level, ease-of use on mobile networks, and expandibility of information were used. We believe that the research results can provide insights for those wishing to explore the convergence level of devices and services and those developing high-level converged devices and digital services.

• Communications for Statistical Applications and Methods
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• 제3권2호
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• pp.1-11
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• 1996

The detection of multiple outliers in nonlinear regression models can be computationally not feasible. As a compromise approach, we consider the use of simulated annealing algorithm, an approximate approach to combinatorial optimization. We show that this method ensures convergence and works well in locating multiple outliers while reducing computational time.

• 전기학회논문지
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• 제67권11호
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• pp.1562-1569
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• 2018

Sensor readings always have a certain degree of randomness and fuzziness due to its intrinsic property, other electronic devices in the circuitry, wires and the rapidly changing environment. In an electrical control system, such readings will bring instability in the system and other undesired events especially if the signal hovers around the threshold. This paper proposes a Gaussian-based statistical approach in stabilizing the output through sampling the sensor data and automatic tuning the threshold to the range of multiple standard deviations. It takes advantage of the Central limit theorem and its properties assuming that a large number of sensor data samples will eventually converge to a Gaussian distribution. Experimental results demonstrate the effectiveness of the proposed algorithm in completely stabilizing the outputs over known filtering algorithms like Exponential smoothing and Kalman Filter.

• 융합정보논문지
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• 제9권8호
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• pp.164-169
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• 2019

본 연구는 천연조미료(깨류)의 '맛[味]'을 동양의학사상의 음양오행(陰陽五行)의 '상생상극(相生相克)' 원리에 의한 우리 몸의 오장육부와 그에 상응하는 관계가 건강관리와 질병을 예방하는 측면에서 고찰하였다. 천연조미료인 깨와 동양의학의 융합연구를 위하여 동양의학의 고전인 황제내경(黃帝內經), 동의보감(東醫寶鑑), 및 전문단행본, 논문 등의 기록에서 분석하였으며, 깨류의 섭취는 친화성이 있는 장부와 오미(五味)[산(酸) 고(苦) 감(甘) 신(辛) 함(鹹)]를 섭취하면 장수시대에 '건강수명'을 연장하는데 기여할 것으로 본다.