• 대한전자공학회논문지SD
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• 제46권10호
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• pp.46-52
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• 2009

현재 개발되고 있는 Shader 프로세서는 처리 성능을 높이기 위하여 Multi-Core, Multi-Thread를 채택하고 있다. 또한 Shader 프로세서에서 각 수행 단계별 마다 IP를 따로 구현하지 않고 하나의 Core IP를 다양한 목적으로 사용할 수 있도록 설계하고 있다. 본 논문에서는 이러한 목적에 맞게 Shader-Core를 이용하여 연산이 가능하고, Multi-Core, Multi-Thread 기반에서 픽셀의 병렬처리가 가능하도록 고안된 Vector 기반의 Rasterization알고리즘을 제안한다. 이를 통하여 동일 조건의 기존 알고리즘에 비하여 약 2%의 연산량을 가지면서 각 픽셀이 독립적으로 연산이 가능하도록 하였다.

• 펄프종이기술
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• 제46권5호
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• pp.88-97
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• 2014

For the purpose of reproduction of traditional gold thread, the artifact investigation was organized for 70 cases (109 pieces) of relics from Korea, China and Japan. In most cases, the main backside material of gold thread from Korea was the bast fibers from paper mulberry. In this study, the optimum sheet-making of Hanji for gold thread reproduction was tried by controlling several process factors of Hanji such as the cooking and beating time of paper mulberry fibers, the number of sheet-making ply, and converting method (Dochim). Tensile index, folding endurance and compressive strength of Hanji showed differences according to the correlation between cooking and beating time, and application of converting method (Dochim), while bending stiffness fell with decrease of thickness. These results can be applied to consider manufacturing factors to make Hanji for the production of gold thread.

• 한방안이비인후피부과학회지
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• 제27권4호
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• pp.16-44
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• 2014

Objective : To search the trend of studying thread-embedding therapy in Korean medicine academia up to now and to expand the range of using thread-embedding therapy in the future, this study was designed. Methods : Using search portal sites the following; http://oasis.kiom.re.kr, http://www.riss.re.kr, collected 37 articles and devided those three parts and classificated those into four subsection as follows; total analysis, original article, case report. Results : The number of articles are 8 review articles, 14 original articles, 15 case reports. In the year 2013, 14 articles were published and ranked highest(37.8%). The journal of acupuncture & moxibustion medicine society ranked highest(40.5%). 5 persons ranked highest(32.4%) in number of author. Facial beauty care ranked highest(21.6%) in clssification of disease. Remedy item ranked highest(50.0%) in classification of subjects of 8 review articles. No more than 25 persons ranked highest(66.7%) and 6~12months of treatment period ranked highest(33.3%) in 14 original articles. Conclusions : Thread-embedding therapy is considered very useful on various part of Korean medicine clinic. We need to expand application scope of thread-embedding therapy in the future.

• 대한의용생체공학회:의공학회지
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• 제42권1호
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• pp.1-6
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• 2021

Recently, various types of pedicle screws have been developed considering the anatomical structure of the spine. The purpose of this study was to evaluate the pullout stiffness and strength of two types of commercial pedicle screws. The design of two type screws were single pitched thread (ST) pedicle screw and dual pitched thread (DT) pedicle screw, respectively. The tests were conducted in accordance with the ASTM standards using polyurethane (PU) test blocks which has anatomical structure of the spine. There was no significant difference in pullout stiffness between two types of screw. However, DT exhibited higher pullout strength than ST (p<0.05). Pedicle screw with dual pitched thread showed higher pullout strength without decrease in pullout stiffness compared to the standard pedicle screw. In conclusion, dual pitched thread design of the pedicle screw is considered to be more suitable than the single pitched thread for the anatomical structure of the spine.

• International Journal of Internet, Broadcasting and Communication
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• 제16권1호
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• pp.72-79
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• 2024

This study focuses on combining traditional craft lacquer thread sculpture and augmented reality (AR) technology to develop digital educational content. In this way, we not only make it easier and easier for children to learn and understand the traditional craftsmanship of lacquer thread sculpture, but also finds a new direction for traditional craft education. First, through literature research, the production process of traditional craft lacquer thread sculpture is summarized. Through an in-depth understanding of traditional craft lacquer thread sculpture, it provides a theoretical basis for subsequent AR digital content development to achieve educational goals. Next, we used AR technology to design and produce the digital content of the traditional craft lacquer thread sculpture. This study proposes the application of AR technology and the design and production methods of digital content. It is hoped that the methods and experiences we have proposed will not only provide reference for the development of similar digital content in the future, but also provide new educational methods for the inheritance of traditional crafts.

• 구강회복응용과학지
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• 제21권2호
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• pp.153-167
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• 2005

The purpose of this study was to compare the v-shape thread with the square shape thread of fixture in the view of stress distribution pattern using finite element stress analysis. The finite element model was designed with the parallel placement of two standard fixtures(4.0 mm diameter ${\times}$ 11.5 mm length) on the region of mandibular 1st and 2nd molars. Three dimensional finite element model was created with the components of the implant and surrounding bone. This study simulated loads of 200 N at the central fossa in a axial direction (load A), 200 N at the buccal offset load that is 2 mm apart from central fossa in a axial direction (load B), 200 N at the buccal offset load that was 4 mm apart from central fossa in a axial direction (load C). These forces of load A',B',C' were applied to a $15^{\circ}$ inward oblique direction at that same site with 200 N. Von Mises stress values were recorded and compared in the supporting bone, fixture, and abutment screw. The following results have been made based on this study : 1. The highest stress concentration occurred at the cervical region of the implant fixture. 2. Von Mises stress value of off-site region was higher than that of central fossa region. 3. Square shape thread type showed more even stress distribution in the vertical and oblique force than V-shape thread type. 4. Stress distribution was the most effective in the case of buccal offset load (2, 4 mm distance from central fossa) in the square shape thread type. 5. V-shape thread type revealed higher von Mises stress value than square shape thread type in all environmental condition. The results from numerical analyses concluded that square shape thread type had the lower destructive stress and more stress distribution between the fixture and bone interface than V-shape thread type. Therefore, square shape thread type was regarded as optimal thread configuration in biomechanical concepts.

• 대한공업교육학회지
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• 제33권1호
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• pp.265-281
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• 2008

본 연구의 목적은 정보통신기술 영역의 데이터 통신 원리 중에서 다중프로세스 방식과 다중 쓰레드 방식의 병행서버에 대해 직접 체험할 수 있는 실습사례를 제시하는 데 있다. 이를 위해 먼저 다중 프로세스 방식인 포크 서버(fork server)와 다중 쓰레드 방식인 쓰레드 서버(thread server), 그리고 쓰레드 클라이언트(thread client)를 구현하였다. 다음에 실험환경으로서 이더넷(ethernet)을 이용한 소규모 네트워크를 구성하였으며 사용자 수에 따른 데이터 전송시간을 측정하였다. 데이터 전송시간을 측정한 결과, 쓰레드 서버가 포크 서버에 비해 약 20~61%의 전송시간 절감율을 보였으며 두 서버 모델 간 전송시간 차이는 사용자 인원수에 비례하였다. 두 서버 모델 간 발생하는 성능차이의 주된 원인은 프로세스 포크(fork)와 쓰레드 생성에 소요되는 시간이 다르기 때문이다. 아울러, 프로세스 간, 쓰레드 간 스케줄링에서 발생하는 문맥전환(context switching) 역시 웹 서버의 부하에 영향을 주는 것을 알 수 있었다. 본 연구를 통해 제시된 실습사례와 측정된 실험데이터는 학교현장에서 수업시간에 데이터통신 원리에 대해 직접 체험할 수 있는 교육적 실습자료로 활용될 수 있다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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• pp.39-41
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• 2004

In this paper, I propose a thread scheduling policy for faster packet processing on the network processors with multithreaded multiprocessor architecture. To implement the proposed policy, I derived several basic parameters related to the thread scheduling and included a new parameter representing the packet contents and the features of the multithreaded architecture. Through the empirical study using a network processor, I proved the proposed scheduling ploicy provides better throughput and load balancing compared to the generally used thread scheduling policy.

• 대한치과보철학회지
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• 제38권4호
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• pp.526-543
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• 2000

Finite element analyses were performed to study effects on stress distribution generated in jaw bone for various shapes of dental implants: plateau type, plateau with small radius of curvature, triangular thread screw type in accordance with ISO regulations and square thread screw filleted with small radius partially. It was found that square thread screw filleted with small radius was more effective on stress distribution than other dental implants used in analyses. Additional analyses were performed on the implant with square thread screw filleted with small radius for very-ing design parameters, such as the width of thread end, the height of the thread of the implant and load direction, to determine the optimum dimensions of the implant. The highest stress concentration occurred at the region in jaw Pone adjacent to the first thread of the implant. The maximum effective stress induced by a 15 degree oblique load of 100 N was twice as high as the maximum effective stress caused by an equal amount of vertical load. Stress distribution was more effective in the case when the width of thread end and the height of thread were p/2 and 0.46p, respectively, where p is the pitch of thread. At last, using tensile force calculated from the possible insert torque without breading bone thread, finite element analysis was performed on the implant to calculate pre-stress when the primary fixation of the implant was operated in jaw bone. The maximum effective stress was 136.8 MPa which was proven to be safe.

• 복식
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• 제52권5호
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• pp.145-154
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• 2002

1. The blended tabby whose warp and weft each employs a different kind of thread had been weaved since the era of the Three Kingdoms in this nation and since the period of Han in China. Especially in the 15th century. very finely weaved fabrics as the specialty of Chosun were exported to China. In the 16th century. blended tabby weaved with silk and cotton were often used for clothes as cotton was produced around the nation. And in the 17th century. blended tabby employing high quality Chinese raw silk other than existing ones were weaved. 2. It has been found in literature review that Honpo, one of Chosun's blended tabby. was manufactured mainly in Hamkyung, Cholla and Kyungsang provinces and mostly distributed through markets of Chungchong and Cholla provinces. 3. Out of the total 19 fabric pieces. 13 employed silk thread as the warp and cotton thread as the weft. Compared with the weft. in general. the warp is given more tension when weaved and more friction by spindles, being more likely to be twisted than the weft. In addition to starching, a stronger thread is requested as the warp. It is natural that in the Chosun period, silk thread more stronger than cotton thread was used as the warp to make more durable fabrics. For the weft requiring lots of threads when weaved. cotton thread was mainly used in the 17th century because the thread could be easily obtained at that time. 4. So far the study has made an empirical review of Chosun's blended tabby. especially those of the 15th∼17th century, in terms of their production and distribution. Findings from the study have some limit because they have been made focusing on the 15th∼17th century not the whole period of Chosun. Therefore it is needed to complement those findings through further studies.