• 수면정신생리
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• 제8권1호
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• pp.67-71
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• 2001

Independent Component Analysis (ICA) is a blind source separation method using unsupervised learning and mutual information theory created in the late eighties and developed in the nineties. It has already succeeded in separating eye movement artifacts from human scalp EEG recording. Several characteristic sleep waves such as sleep spindle, K-complex, and positive occipital sharp transient of sleep (POSTS) can be recorded during sleep EEG recording. They are used as stage determining factors of sleep staging and might be reflections of unknown neural sources during sleep. We applied the ICA method to sleep EEG for sleep waves separation. Eighteen channel scalp longitudinal bipolar montage was used for the EEG recording. With the sampling rate of 256Hz, digital EEG data were converted into 18 by n matrix which was used as a original data matrix X. Independent source matrix U (18 by n) was obtained by independent component analysis method ($U=W{\timex}X$, where W is an 18 by 18 matrix obtained by ICA procedures). ICA was applied to the original EEG containing sleep spindle, K-complex, and POSTS. Among the 18 independent components, those containing characteristic shape of sleep waves could be identified. Each independent component was reconstructed into original montage by the product of inverse matrix of W (inv(W)) and U. The reconstructed EEG might be a separation of sleep waves without other components of original EEG matrix X. This result (might) demonstrates that characteristic sleep waves may be separated from original EEG of unknown mixed neural origins by the Independent Component Analysis (ICA) method.

• 한국의류학회지
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• 제29권11호
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• pp.1381-1388
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• 2005

The purpose of this study was to identify features of masstiege high-end products by comparing to original old high-end products. For this purpose, the differences in values between each consumer groups divided by preferred products types (high-end products, original old high-end products) were examined. This study was executed by consumer survey and 279 female data were used in analysis. The results are as follows. First, the value factors pursued on high-end products were constructed by factor analysis and the factors consisted of 4 elements; conspicuous, aesthetic, durable, conformity. Next, the differences in value elements between masstiege high-end products and original old high-end products were identified by t-test. The consumers preferring original old high-end products pursued conspicuous features significantly more and the consumers preferring masstiege high-end products considered aspects of aesthetic and conformity elements as more important. And according to kinds of preferring high-end product, demographic characteristics were different. The consumers who were of high age, high education and high income and married consumers preferred original old high-end products, whereas the consumers who were of low age, low education and low income and unmarried consumers preferred masstiege high-end products. Finally, marketing strategies for masstiege brand were suggested on the base of the results.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제38회 동계학술대회 초록집
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• pp.222-222
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• 2010

Transparent semiconductor oxide thin films have been attracting considerable attention as potential channel layers in thin film transistors (TFTs) owing to their several advantageous electrical and optical characteristics such as high mobility, high stability, and transparency. TFTs with ZnO or similar metal oxide semiconductor thin films as the active layer have already been developed for use in active matrix organic light emitting diode (AMOLED). Of late, there have been several reports on TFTs fabricated with InZnO, AlZnSnO, InGaZnO, or other metal oxide semiconductor thin films as the active channel layer. These newly developed TFTs were expected to have better electrical characteristics than ZnO TFTs. In fact, results of these investigations have shown that TFTs with the new multi-component material have excellent electrical properties. In this work, we present TFTs with inverted coplanar geometry and with a novel HfInZnO active layer co-sputtered at room temperature. These TFTs are meant for use in low voltage, battery-operated mobile and flexible devices. Overall, the TFTs showed good performance: the low sub-threshold swing was low and the $I_{on/off}$ ratio was high.

• 한국컴퓨터정보학회논문지
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• 제26권1호
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• pp.11-17
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• 2021

본 논문에서는 순수 함수형 언어로 작성된 쌍방시뮬레이션 알고리듬의 성능을 멀티코어 프로세서 컴퓨터에서 병렬화로 향상시키는 방법을 연구한다. 이 병렬화에 있어 핵심 아이디어는 순수 함수형 프로그램의 참조 투명성을 십분 활용하면 병렬화가 전혀 고려되지 않고 작성된 초기 구현으로부터 최소한의 수정만으로 성능 개선 효과를 기대할 수 있다는 것이다. 초기 구현과 병렬화 구현 둘 다 순수 함수형 언어인 하스켈로 작성되었다. 초기 구현을 병렬화할 때 변화는 아주 적어서 병렬화된 구현에서도 초기 구현의 프로그램 구조가 거의 그대로 유지되었다. 벤치마크를 통해 제시된 간단한 병렬화만으로도 초기 구현과 비교해 두 배 이상의 성능 개선을 확인했다. 또한, 병렬화와는 별개의 최적화 기법인 메모이제이션이 적용된 버전의 쌍방시뮬레이션 구현에도 같은 방식의 병렬화를 적용함으로써 마찬가지로 성능을 개선할 수 있음을 확인하였다.

• International journal of advanced smart convergence
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• 제12권2호
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• pp.25-33
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• 2023

The purpose of this study is to evaluate the impact of intermediate features on FER performance. To achieve this objective, intermediate features were extracted from the input images at specific layers (FM1~FM4) of the pre-trained network (Resnet-18). These extracted intermediate features and original images were used as inputs to the vision transformer (ViT), and the FER performance was compared. As a result, when using a single image as input, using intermediate features extracted from FM2 yielded the best performance (training accuracy: 94.35%, testing accuracy: 75.51%). When using the original image as input, the training accuracy was 91.32% and the testing accuracy was 74.68%. However, when combining the original image with intermediate features as input, the best FER performance was achieved by combining the original image with FM2, FM3, and FM4 (training accuracy: 97.88%, testing accuracy: 79.21%). These results imply that incorporating intermediate features alongside the original image can lead to superior performance. The findings can be referenced and utilized when designing the preprocessing stages of a deep learning model in FER. By considering the effectiveness of using intermediate features, practitioners can make informed decisions to enhance the performance of FER systems.

• 헤리티지:역사와 과학
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• 제49권1호
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• pp.100-119
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• 2016

'원형'과 '원형유지'는 국내 문화재의 보존 관리 및 활용에 있어서 철학적 토대를 이루는 핵심적인 개념이자 원칙이다. '원형'은 20세기를 전후한 근대기에 국내에 그 용어가 유입된 이후 구체적인 의미에 대하여 심도 있는 논의나 연구가 이루어진 적이 없었던 탓에 여전히 모호하고, 추상적이며, 주관적인 개념을 지닌 용어로 남아있다. 또한 용어에 대한 개념이 구체적이지 않은 상태에서 1999년 문화재보호법에 '원형유지' 조항이 신설되어 문화재를 보존 관리하는 기본원칙으로 명문화되었지만 유효한 원칙으로 실무에 적용되는 데에는 한계가 있다. 본 논문은 이러한 문제점을 개선하기 위한 첫 단계로 원형개념이 유입되는 과정과 시대적 배경, 그리고 원형유지의 원칙이 문화재 보존 관리 및 활용의 공식적인 원칙으로 자리잡는 과정을 고찰하였다. 본 논문에서는 문헌검토와 사례연구를 통해 개념이 유입되고 정착하는 과정에서 '시대'와 '양식'을 중심으로 원형개념이 고착화되는 경향, 그리고 시대 중에서도 최초의 시기, 또는 가장 이른 시기를 의미하는 개념으로 주로 사용하고 있다는 점을 서술하였다. 그로인해 고정된 시점에 맞추어 문화재를 보존관리하면서, 원형이 지녀야 하는 다양한 측면의 속성들을 간과해 온 결과 원래의 재료 등 원형의 핵심적인 요소들이 손실된 채 문화재를 보존하는 문제점이 야기되었다. 필자는 이러한 태도와 경향이 문화재를 다양한 가치를 지닌 대상으로 이해하기 보다는 역사적, 예술적 가치, 특히 그 중에서도 역사적 가치와 흔적을 담아내는 물질적 산물로 보기 때문이라고 보았다. 나아가 시대적인 역사인식이 단층적이며, 원형유지의 원칙을 수립하는 과정에서 원칙의 타당성에 대하여 보존철학적 관점에 근거한 심도있는 논의가 부족하다는 데에 기인하고 있음을 지적하였다. 마지막으로 앞으로 원형에 대한 개념정의는 문화재가 지닌 다양한 가치를 고려하여 그 개념이 다면적 다층적으로 재설정되어야 하며, 문화재의 종류별 특성을 고려한 원형개념이 정립되어야 하고, 원형유지 조항의 타당성과 실현가능성을 검토하여 실제 적용하기 위한 구체적인 지침이 제시되어야 한다고 제언하였다.

• 한국작물학회지
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• 제48권
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• pp.79-95
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• 2003

To clarify the botanical origins of oriental medicines which have been argued or confused for plant origins, species of original plants were investigated through the textural research for oriental medicines and the comparison of Chinese, Korean, Japanese and North Korean Pharmacopoeia. Twenty oriental medicines were studied; Angelicae Gigantis Radix, Rhei Rhizoma, Atractylodis Rhizoma Alba, Aconiti Lateralis Radix Preparata, Acanthopanacis Cortex, Osterici Radix, Cnidii Rhizoma, Saposhnikovae Radix, Magnoliae Cortex, Paeoniae Radix, Liriopis Tuber, Zanthoxyli Fructus, Achyranthis Radix, Sinomeni Caulis et Rhizoma, Polygonati Rhizoma, Cinnamomi Cortex, Visci Herba et Loranthi Ramulus, Fritillariae Thunbergii Bulbus, Pogostemonis Herba, and Curcumae Longae Radix.

• Tribology and Lubricants
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• 제16권2호
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• pp.133-137
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• 2000

A new method to calculate the wear amount using surface profile signal was suggested. It takes advantage of filtering technic to estimate the original surface profile of wear track precisely. The original profile of wear track was estimated by comparing with outside of wear track. The estimated surface profile was well fitted to the original profile assumed unknown.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1999년도 제30회 추계학술대회
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• pp.200-207
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• 1999

A new method for the calculation of a wear amount was suggested. The amount of wear was calculated by the comparison of worn out profile with an estimated original profile. An original profile of wear track was estimated by comparing with outside of wear track. An estimated surface profile was well fitted to the original profile assumed unknown.

• ETRI Journal
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• 제32권4호
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• pp.630-633
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• 2010

In this letter, we propose a novel polygonal approximation of digital curves that preserve original shapes. The proposed method first detects break points, which have two different consecutive vectors, and sets an initial dominant point set. The approximation is then performed iteratively by deleting a dominant point using a novel distance, which can measure both the distance and the angle acuteness. The experimental results show that the proposed method can preserve original shapes and is appropriate for various shapes, including slab-sided shapes.