• Journal of Korean Foot and Ankle Society
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• v.22 no.3
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• pp.91-94
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• 2018

Ankle sprain is one of the most common musculoskeletal injuries. Although most ankle sprains respond well to conservative measures, chronic instability following an acute sprain has been reported to occur in 20% to 40% of patients. Some individuals are eventually indicated for a lateral ankle ligament reconstruction due to persistent ankle instability. More than 80 surgical procedures have been described to address lateral ankle stability. These range from direct repair of the anterior talofibular ligament (ATFL) and of the calcaneofibular ligament (CFL) to reconstructions based on the use of autograft or allograft tissues. However, the best surgical option remains debatable. The modified $Brostr{\ddot{o}}m$ procedure is most widely used for direct ligament repair, but not always possible because of the poor ATFL or CFL quality or deficiency of these ligaments, which prevents effective shortening imbrication. Furthermore, the importance of a CFL reconstruction has been emphasized recently. On the other hand, it is difficult to achieve an efficient CFL reconstruction during the $Brostr{\ddot{o}}m$ procedure. Others have reported that an anatomic reconstruction of injured ligaments restores the normal resistance to anterior translation and inversion without restricting subtalar or ankle motion, and as a result, anatomic reconstructions for lateral ankle instability utilizing an autograft or allograft tendon have gained popularity.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.613-615
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• 2002

본 논문에서는 멀티미디어 데이터의 증가로 인한 네트워크 전송량 폭주 현상 및 서비스 비용의 증가를 감소시키기 위한 방법으로, 부하분산과 관련된 가상서버의 개념에 대해서 알아보고, 대표적인 가상 서버중 하나인 리눅스 가상 서버 (LVS : Linux Virtual Server)의 성능 측정을 통해 멀티미디어 컨텐츠 전송에 사용되는 CDD 시스템에 가장 적합한 가상서버의 구성 및 알고리즘을 도출하였다. 이를 위해서 리눅스 가상서버 시스템을 구축하고, 3가지 구성방식과 8가지 스케줄링 알고리즘에 대한 성능 평가를 수행하였으며, 각 경우에 대한 비교분석을 하였다. 이를 토대로, 추후 CDD 시스템과의 접목을 통하여 네트워크 부하량을 감소시키고, 서버로부터 발생할 수 있는 병목현상을 적은 비용으로 해결할 수 있는 방향을 제시하고자 하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.406-408
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• 2004

TranSend는 클러스터링 기반의 우선 프록시 서버로 제안된 것이나 시스템적인(Systematic) 방법으로 확장성을 보장하지 못하고 불필요한 모듈간의 통신구조로 인해 복잡하다는 단점을 가진다. 기존 연구에서 시스템적인 방법으로 확장성을 보장하고 모듈간의 통신 구조를 단순화(Simplification)한 CD-A라는 구조를 제안하였으나 이 역시 프록시 서버가 증가하면 클러스터링을 위해 사용된 LVS-NAT(Network Address Translation) 방식으로 인해 LVS(Linux Virtual Server)가 병목이 되는 단정을 가진다. 이에 본 논문에서는 프록시 서버가 증가해도 확장성을 보장하는 LVS-DR(Direct Routing) 방식을 사용한 클러스터링 기반의 우선 인터넷 프록시 서버를 제안한다. 16대의 컴퓨터를 사용하여 실험을 수행하였고 실험 결과 클러스터링을 위해 사용된 LVS-NAT 방식에 비해 LVS-DR 방식이 평균 30.85%, 최고 78.50%의 성능 향상을 보였다.

• International Journal of Contents
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• v.5 no.2
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• pp.26-31
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• 2009

This paper describes a new image watermarking scheme invariant to rotation, scaling and translation (RST) attacks. For obtaining the invariance properties we propose to present an image of watermark by wedges and rings to convert its rotation to shift and then utilize the shift invariance property of the Direct Fourier Transform (DFT). But in contrast to conversional schemes based on the Fourier-Mellin transform (FMT), we do not use a log-polar mapping (LPM). As a result, our scheme preserves high quality of original image since it is not underwent to LPM For withstanding against JPEG compression, noise addition and low-pass (LP) filtering attacks a low frequency watermark is embedded into middle frequencies of the original image. Experiments with various attacks show the robustness of the proposed scheme.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1033-1037
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• 1987

This paper proposes a basic implementation of bi-directional transition system between Korean and Japanese. The syntactic structure of Korean language is very similar to that of Japanese. In order to use the same main program for bi-directional translation, system is classified into two parts. One is directly translatable part and the other is untranslatable part by direct matching because of different structure. Solving these problems, the syntactic and semantic informations control bi-directional interpreting process and make equivalent syntactic level between two languages.

• Proceedings of the KSME Conference
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• 2001.11a
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• pp.192-197
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• 2001

To obtain $A_2$ experimentally in the $J-A_2$ theory, deformation field on the lateral surface of a CT specimen was to be determined using Laser speckle method. The crack growth was measured using direct current potential drop method and most procedure of experimental and data reduction was performed according to ASTM Standard E1737-96. Laser speckle images during crack propagation were monitored by two CCD cameras to cancel the effect of rotation and translation of the specimen. An algorithm to pursue displacement of a point from each image was developed and successfully used to measure $A_2$ continuously as the crack tip was propagated. The effects of specimen thickness on J-R curve and $A_2$ were explored.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.3 no.4
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• pp.7-12
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• 2004

Inspection and analysis are essential process to determine whether a completed product is in given specification or not. Analysis of products with very complicated shape is difficult to carry out direct comparison between inspected coordinate and designed coordinates. So process called as matching or registrations is needed to solve this problem. By defining error between two coordinates and minimizing the error, registration is done. Registration consists of translation, rotation and scale transformations. Error must be defined to express feature of inspected product. In this paper, registration algorithm is developed to determine pose of sub-frame at assembly with body of automobile by defining error between two coordinates considering geometric feature of sub-frame.

• Journal of the military operations research society of Korea
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• v.18 no.1
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• pp.32-46
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• 1992

One of the problems we frequently face during the ROK and US Combined operations is the English Military abbreviations because they often causes a lot of confusion. Many military abbreviations we generated, changed, and disappeared, so it is very hard to figure out their meaning sometimes. This system is designed to make it easier to register, alter, and find out English abbreviations through hypermedia techniques, which is utilizing nonsequential and direct search system similar to human sensory organs. So this enables us to keep up with the latest abbreviations. It is also designed to overcome mutual communications barriers by audio-visual aids through the graphic and phonetic functions of the program, and to test users via a random selection of questions.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1996.10a
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• pp.197-202
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• 1996

The dynamic interaction between a translating flexible arm and a trapezoidal velocity profile of a cart to which the flexible arm is attached is presented. Vibration of the flexible arm due to translation is analytically solved, and the conditions for suppressing vibration is derived in terms of velocity profiles. To prove the validity of the solution and the conditions, numerical computation and experiments are camed out. Only a natural frequency of vibrating plant is needed to obtain the conditions for vibration reduction. With this results, a passive vibration regulator as an open loop control scheme can be designed and direct application to industrial plants such as overhead crane can be made.

• Bulletin of the Korean Chemical Society
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• v.22 no.8
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• pp.889-896
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• 2001

The reaction of gas-phase atomic bromine with highly covered chemisorbed hydrogen atoms on a silicon surface is studied by use of the classical trajectory approach. It is found that the major reaction is the formation of HBr(g), and it proceeds th rough two modes, that is, direct Eley-Rideal and hot-atom mechanism. The HBr formation reaction takes place on a picosecond time scale with most of the reaction exothermicity depositing in the product vibration and translation. The adsorption of Br(g) on the surface is the second most efficient reaction pathway. The total reaction cross sections are $2.53{\AA}2$ for the HBr formation and $2.32{\AA}2$ for the adsorption of Br(g) at gas temperature 1500 K and surface temperature 300 K.