• Title/Summary/Keyword: Disc

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Implement and Verification of the Algorithm of the Optical Disc Detection Using the Side-beams (사이드 빔을 이용한 광디스크 판별 알고리즘의 구현 및 검증)

  • 임선미;허준호;추철환;임종철;김태성;김수원
    • Proceedings of the IEEK Conference
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    • 2003.07c
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    • pp.2669-2672
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    • 2003
  • This paper describes a new method of discrimination between the normal disc and the rewritable one. The conventional method of disc discrimination, using Focus error signal, has a heavy fluctuations. To achieve an accurate discrimination, in this paper, the sum of side beam[1]signal is used for that. A new approach is expected to improve the performance of disc discrimination as well as to reduce the signal variation almost by 50%. Techniques in this paper are applicable to the all types of optical disc player, such as CD (compact disc), VCD(Video-CD) and DVD (digital versatile disc) and any other optical disc players.

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A review of degenerative changes in the intervertebral disc (추간원판의 퇴행성 변화에 관한 고찰)

  • Kim Seung-hwan;Park Rae-Joon
    • The Journal of Korean Physical Therapy
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    • v.15 no.2
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    • pp.52-66
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    • 2003
  • The intervertebral disc is a cartilaginous structure that resembles articular cartilage in its biochemistry, but morphologically it is clearly different. It shows degenerative and ageing changes earlier than does any other connective tissue in the body, It is believed to be important clinically because there is an association of disc degeneration with back pain. Degenerative changes in the intervertebral disc are thought to develop as aging, mechanical stress and metabolic factors. Genetic factors may also play a part in the onset or progress of the degenerative process. They, together with environmental factors, may act as determinants of the structural characteristics of the intervertebral disc and produce a tendency to generation, In this short review we outline the morphplogy and biochemistry of normal intervertebral disc and the changes that arise during degeneration. Therefore this study will review degeneration of intervertebral disc, so we will have knowledge about low back pain associated with degenerative change in the intervertebral disc.

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Analysis of Forming Pressure and Burst Pressure of Rupture Disc (Rupture Disc의 성형압력 및 파열압력 해석)

  • Kang, Young-Kyu
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.6
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    • pp.109-114
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    • 2001
  • Forming pressure of the rupture disc has been analyzed theoretically and verified by experiments. Final shape of the rupture disc after forming process is assumed to be hemi-ellipsoid for small height of the rupture disc. The predicted forming pressures are in good agreement with those by experiment. A new simple model has been proposed to predict the burst pressure of the rupture disc. Experimental results show that the proposed model of burst pressure describes the bursting characteristics of the rupture disc very well.

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Factors Affecting the Design of Brake Disc (제동 디스크 설계를 위한 고려 인자 고찰)

  • Kim, Jeong-Guk;Goo, Byeong-Choon;Kwon, Sung-Tae
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.798-803
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    • 2007
  • The brake system of railway plays an important role to enhance the speed of train, and the brake disc is one of major components relating to frictional braking. The performance enhancement of brake disc directly affects the braking performance of train. It is required to understand and investigate the factors need to be considered for the development of new brake disc with improved materials and performance. In this study, through the literature reviews of previous study, several factors including thermal crack phenomena, friction coefficient, materials and durability of disc, temperature characteristics, etc., were introduced for the design of improved brake disc. Moreover, based on the review results, the design direction of new brake disc was suggested. Eventually, a new brake disc with improved performance would be developed based on this investigation.

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Fatigue failure of the optical disc (피로현상에 의한 광디스크의 파손)

  • Hwang, Hyo-Kune;Kim, Nam-Woong;Dan, Byung-Ju;Kim, Jong-Man;Kim, Wae-Yeul;Lee, Jin-Woo
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1056-1061
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    • 2003
  • CD-R disc drive is one of the basic options of personal computer today. In this trend, various CD-R discs can be purchased in every market. Even very low quality discs are in market too. Today's CD-R disc drive is being operated over 10,000 RPM. So the possibility of the disc fracture is growing faster. Sometimes, during the test of a new disc drive by various methods to confirm the quality of it, fracture of the disc happens. And it happens in end user's personal computer scarcely. In this reason, new methods to confirm the quality and the failure mechanism of the optical disc are studied in this paper.

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Static fatigue failure of the rotating optical disc (회전 중 원심력에 의한 광디스크의 피로 파손)

  • Hwang, Hyo-Kune;Kim, Nam-Woong;Dan, Byung-Ju;Kim, Jong-Man;Kim, Wae-Yeul;Lee, Jin-Woo
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.150-155
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    • 2004
  • The base material of optical disc is the amorphous polymer, polycarbonate. So crack growth on the rotating optical disc could happen by the static centrifugal force. This phenomenon is called static fatigue. Today's CD-R disc drive is being operated over 10,000 RPM. This is increasing the possibility of the disc fracture when operating. In this reason, new method to measure the static fatigue threshold quality and the way to calculate the threshold J-integral value and the safe crack length of the optical disc are studied. Finally the environmental effect to optical disc is also studied in this paper.

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Optimization of an Automotive Disc Brake Cross-section with Least Thermal Deformation by Taguchi Method (최소 열변형을 위한 자동차 디스크 브레이크 단면형상의 다구찌기법 기반 최적설계)

  • Kim, Cheol;Ha, Tae-jun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.1
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    • pp.1-9
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    • 2016
  • Optimum cross-sectional shape of an automotive disc brake was developed based on FEM thermal analyses and the Taguchi method. Frictional heat flux and convection heat transfer coefficients were first calculated using equations and applied to the disc to calculate accurate temperature distribution and thermal deformations under realistic braking conditions. Maximum stress was generated in an area with highest temperature under pads and near the hat of ventilated disc and vanes. The SN ratio from Taguchi method and MINITAB was applied to obtain the optimum cross-sectional design of a disc brake on the basis of thermal deformations. The optimum cross-section of a disc can reduce thermal deformation by 15.2 % compared to the initial design.

Computed Tomographic Images of Vertebral Disc Herniation in Dogs (개에서 컴퓨터 단층 촬영 검사를 통한 추간판 탈출증 진단례)

  • 이기창;송경진;권정국;최민철
    • Journal of Veterinary Clinics
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    • v.20 no.4
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    • pp.519-522
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    • 2003
  • An appearance of herniated intervertebral disc into thoracolumbar vertebral canal was evaluated in two patients using computed tomography (CT). Before CT scanning, plain radiography and myelography were performed in both cases. CT images were compared to those of myelography. Dogs were positioned in sternal recumbency under inhalation anesthesia and transverse slices with 2 mm thickness were obtained around thoracolumbar region. The transverse CT images were examined using both vertebral and spiral window mode. The most common findings on CT images were loss of vertebral canal epidural fat, bulging of vertebral canal disc margins, displacement of spinal cord and flatted vertebral canal. Whereas, narrowed intervertebral disc space and simple extradural pattern were the main findings on plain and contrast radiographs. CT imges showed the extent of the herniated disc lesion, type II intervertebral disc hernation, and the displacement of spinal cord in detail in both occations. It is considered that degree and precise localization of the intervertebral disc herniation and subtle lesion of spinal cord could be identified accurately using computed tomography.

An Analysis of the State of Cervical Disc Herniation According to Cervical Lordosis and Age (경추 전만 정도 및 연령에 따른 경추 추간판 탈출 양상 분석 연구)

  • Lim, Ji Seok;Yoon, Kang Hyun;Lee, Seungmin;Cho, Ye Eun;Park, Ji Min;Lee, Sang Hoon;Kim, Yong Suk
    • Journal of Acupuncture Research
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    • v.32 no.3
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    • pp.107-115
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    • 2015
  • Objectives : The aim of this study is to investigate the state of cervical disc herniation according to the degree of cervical lordosis and age. Methods : 67 records of inpatients who were diagnosed with herniated intervertebral disc(HIVD) of the cervical spine were analyzed. Cobb's method, Jochumsen method and the Ishihara index were used to measure the degree of cervical lordosis. The state of the cervical disc was identified using magnetic resonance imaging(MRI) of the cervical spine. Then correlations among cervical lordosis, age and cervical disc herniation were analyzed. Results : Disc bulging was associated with hypolordosis and disc protrusion was associated with hyperlordosis and age. Disc extrusion was not associated with either cervical lordosis or age. The number of disc herniations in the cervical spine was correlated with age significantly, but not with cervical lordosis. Conclusions : Cervical disc herniation had a tendency to correlate with age and cervical lordosis, although this is not definite. Future studies that analyze more radiographic images of patients with HIVD of the cervical spine might be necessary to identify the influence of cervical lordosis on cervical disc herniation.

A Study on the Major Satisfaction and Job Preferences of Dental Hygiene Students according to Their DISC Behavioral Patterns (일부 치위생(학)과 학생의 DISC행동유형에 따른 전공만족도와 직업선호도 연구)

  • Lee, Sun-Hee;Shim, Hyun-Ju
    • Journal of Convergence for Information Technology
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    • v.9 no.5
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    • pp.217-227
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    • 2019
  • The purpose of this study had been conducted to figure out the relationship of DISC typy behavioral patterns between major satisfaction and job preference. The survey in this subject had been carried out for 192 dental hygiene students from April 1 to 10, 2019. The findings were as follows: Among the sub-factors of major satisfaction based on DISC typy behavioral patterns, S type is higher in the contents of instruction and the way of teaching, the type C and S are higher in school facilities and environments. Among the sub-factors of job preference based on DISC typy behavioral patterns, the type D is higher in honor, development and stability, the type S is higher in aptitude, interest, development, stability and working environment, and the type C is higher in aptitude and interest. As DISC typy behavioral patterns, major satisfaction, and job preference were found to be related to one another, this finding should be considered when teaching career guidance for college students.