• 대한기계학회논문집A
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• 제41권9호
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• pp.839-844
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• 2017

최근 3차원 프린팅 기술은 비약적으로 발전하여 쾌속조형기술의 대명사가 되고 있다. FDM 방식의 3D프린터는 쾌속조형에 사용되는 가장 일반적인 프린터이지만, 열에 취약하고, 출력물의 표면이 매끄럽지 못하는 등의 문제를 가지고 있다. 본 논문에서는 FDM방식의 3D프린터로 ABS재질의 시편을 제작하였고, 아세톤에 시편을 담그는 방식으로 후처리를 수행하였다. 공정시간을 변수로 후처리를 진행하였으며, 처음 5초의 후처리 시간동안에는 시편의 표면조도가 급격하게 개선되는 결과를 획득하였으며, 5초 이후에는 표면조도의 변화정도가 미미하였다. 또한, 이러한 후처리 공정은 적지만 시편의 인장강도와 파단변형률을 상승시키는 결과를 나타내었다.

• Fibers and Polymers
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• 제7권3호
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• pp.305-309
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• 2006

This research studies the factors which influence the tensile strength of tire cords. Five yam samples are made by changing the spinning conditions and viscosity to get various physical properties. Different twisting methods are introduced and the yams are twisted under different processing conditions for each twisting process. With the experimental results, various analyses are performed to find the important factors in retaining strength after the twisting process. SEM and optical microscopic photographs are taken along with some measurements to assist the analysis.

• 척추신경추나의학회지
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• 제16권2호
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• pp.47-54
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• 2021

Objectives This review was conducted to study use of Aconitum herbal medicine for pain control in musculoskeletal disease. Methods Musculoskeletal disease is a major factor of social cost increase and physical disability. Various drugs, surgery and imaging are being overused regardlessly. Aconitum herbal plants are one of the most toxic Korean traditional herbs. However, they could be utilized effectively on patients with appropriate processing and decocting time. We searched Korean medicine literature to see various features of aconitum herbal plants and tried to find the utilization of the plants in effective way for pain control in musculoskeletal disease. Results Aconitum herbal plants needs to be used carefully because of intoxication which could lead to severe damage to human body. Processing of these toxic plants could minimize the harm and raise the benefits, such as relieving various types of pain and positive inotropic action. Further studies with clearer evidence and discovering aftereffects of processing in more details are needed. Conclusions Aconitum herbal plants could dedicate to controlling pain in musculoskeletal disease with various forms and appropriate processing.

• 한국정보처리학회논문지
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• 제5권3호
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• pp.633-648
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• 1998

빠른 컴퓨팅 환경과 응용 구조의 변화, 그리고 다양한 요구는 소프트웨어 개발에 대한 수요를 증대시키고 있다. 버전제어는 기존의 소프트웨어를 구축하는데 사용된 델타를 이용하여 소프트웨어의 생산성을 향상시킨다. 본 논문에서는 검색 시스템과 델타 관리 프로그램으로 구성된 객체지향 버전제어 시스템을 설계 및 구현하였다. 검색 시스템에서는 다양한 검색 방법을 제안한다. 이 방법은 파일 이름, 내용, 크기, 그리고 작업일자를 가지고 처리하는 방법론을 제공한다. 다양한 검색 방법은 효율적인 델타 관리를 위해 중요하다. 이러한 방법을 이용하여 델타 관리를 위한 메타 데이터를 쉽게 구성할 수 있다. 구현된 버전 제어 시스템은 다른 시스템과 비교하여 다음과 같은 장점을 가진다. 첫째, 델타 관리를 위해 전향적 및 후향적 방법을 통합하여 버전의 유지보수를 처리한다. 둘째, 프로젝트내에서 델타 관리 분은 전향적과 후향적 방법을 통합하여 관리의 효율성을 증대한다. 제안된 시스템은 프로젝트 저장소를 위해 파일과 데이터베이스를 사용하는 방법을 지원하여, 효율적인 버전 관리가 되도록 하였다.

• Journal of Biosystems Engineering
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• 제24권5호
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• pp.431-438
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• 1999

The environmental control based on interactive thermoregulatory behavior for swine production has many advantages over the conventional temperature-based control methods. Therefore, this study was conducted to compare various feature selection methods using postural images of growing pigs under various environmental conditions. A color CCD camera was used to capture the behavioral images which were then modified to binary images. The binary images were processed by thresholding, edge detection, and thinning techniques to separate the pigs from their background. Following feature were used for the input patterns to the neural network ; \circled1 perimeter, \circled2 area, \circled3 Fourier coefficients (5$\times$5), \circled4 combination of (\circled1 ＋ \circled2), \circled5 combination of (\circled1 ＋ \circled3), \circled6 combination of (\circled2 ＋ \circled3), and \circled7 combination of (\circled1 ＋ \circled2 ＋ \circled3). Using the above each input pattern, the neural network could classify training images with the success rates of 96%, 96%, 96%, 100%, 100%, 96%, 100%, and testing images with those of 88%, 86%, 93%, 96%, 91%, 90%, 98%, respectively. Thus, the combination of perimeter, area and Fourier coefficients of the thinning images as neural network features gave the best performance (98%) in the behavioral classification.

• 융합신호처리학회논문지
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• 제14권3호
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• pp.154-161
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• 2013

본 논문에서는 인간시각필터로 고려되는 Gabor 코사인과 사인 함수를 이용한 변환을 디지털 영상의 워터마킹 방법에 적용하였다. 변환된 주파수 영역에서 SVD의 특이값 또는 주성분을 이용한 4가지 워터마크 삽입과 추출 알고리즘을 제안한다. 삽입한 워터마크는 2차원 영상이고, 삽입한 워터마크와 추출한 워터마크 사이의 유사성을 측정하기 위하여 시각적인 판단뿐만 아니라 정규화된 상관값을 계산하였으며, 제안한 4가지 방법의 성능을 다양한 공격에 대해서 비교하였다. 가장 낮은 수평 또는 수직 교류 주파수 성분에 워터마크를 삽입하는 GCST-SVD 방법이 여러 공격에 대한 실험 결과로부터 높은 상관값과 시각적인 워터마크 특징을 잘 나타내므로 좋은 워터마킹 방법으로 사용할 수 있음을 볼 수 있다.

• International Journal of Contents
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• 제14권3호
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• pp.17-26
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• 2018

To ensure safety of bridges, it is critical to inspect and assess physical and functional conditions regularly. Presently, most highway bridges in the U.S. are inspected visually. However, this method of inspection is often influenced by the bridge inspector's knowledge and experience. So, reliability and accuracy of inspection results may be problematic. To solve such problems, an extensive number of robotics systems and image processing techniques for bridge inspection methods have been proposed. These robotics systems and image processing techniques are used to measure various bridge conditions, such as apparent damage, displacement and dynamic characteristics. This paper provides a comprehensive review of robotics systems and image processing technologies used in bridge inspection.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.757-758
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• 2008

This paper aims to propose an emergency recognition system using multimodal information extracted by an image processing module, a voice processing module, and a gravity sensor processing module. Each processing module detects predefined events such as moving, stopping, fainting, and transfer them to the multimodal integration module. Multimodal integration module recognizes emergency situation by using the transferred events and rechecks it by asking the user some question and recognizing the answer. The experiment was conducted for a faint motion in the living room and bathroom. The results of the experiment show that the proposed system is robust than previous methods and effectively recognizes emergency situations at various situations.

• 대한조선학회논문집
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• 제52권5호
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• pp.365-371
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• 2015

Hull plate consists of various types of curved plates and there also exists corresponding processing methods. Typically, curved plates can be divided into convex type and saddle type. Large amount of research has been conducted mainly focusing on application of processing method of convex type, saddle type and hybrid type, but research on determination and processing method application of the most difficult S-shaped curved plate that has inflection lines has not been carried out yet. In this paper, as the fundamental research of appropriate processing method application, a calculation method is proposed to calculate inflection lines on curved plates. In order to calculate inflection lines, normal curvature and information of fabricated curved plates should be utilized. We compare the workability of the fabrication for hull plate using inflection line.

• 산업기술연구
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• 제43권1호
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• pp.49-55
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• 2023

Cluster tools are extensively employed in various wafer fabrication processes within the semiconductor manufacturing industry, including photo lithography, etching, and chemical vapor deposition. Contemporary fabrication facilities encounter customer orders with technical specifications that are similar yet slightly varied. Consequently, modern fabrications concurrently manufacture two or three different wafer types using a cluster tool to maximize chamber utilization and streamline the flow of wafer lots between different process stages. In this review, we introduce two methods of concurrent processing of multiple wafer types: 1) concurrent processing of multiple wafer types with different job flows, 2) concurrent processing of multiple wafer types with identical job flows. We describe relevant research trends and achievements and discuss future research directions.