• 제목/요약/키워드: HIP Process

검색결과 139건 처리시간 0.03초

Ren$\'{e}$ 95 초내영 합금 분말을 이용한 열간 정수압 성형 및 성형 조건에 따른 미세조직 변화 (HIP Consolidation and Effect of Process Variables on Micristructure for Ren$\'{e}$ 95 Superalloy Powders)

  • 표성규
    • 한국분말재료학회지
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    • 제6권2호
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    • pp.152-162
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    • 1999
  • The present study is concerned with the effect of PM process variables on the microstructure by using atomized superalloy powders. It is suggested that the inhomogeneity of composition is strongly dependent on the process variables. The contents of segregation elements of plasma rotating electrode process (PREP) powders are larger than those of Ar atomization (AA) powders. As HIP treatment temperature in-increases, the secondary phases on the prior particle boundaries (PPB) have continuous,uniform distribution and high density, but the amount of PPB decreases suddenly at 1150$^{\circ}$C. Segregated phases on the PPB are identified to be MC type carbide. Brittle MC type carbides on the PPB provide fracture initiation sites and preferred fracture path, thereby leading to intergranular type brittle fracture.

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고관절 가동성 증진을 위한 고유수용성 신경근 촉진 스트레칭의 생체역학적 고찰 (A Biomechanical Study on the Hip Joint Flexibility Based on the Proprioceptive Neuromuscular Facilitation)

  • 장지홍
    • 한국정보전자통신기술학회논문지
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    • 제8권1호
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    • pp.65-69
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    • 2015
  • 작업치료에서 관절의 가동성은 치료 절차와 기간에 영향을 미치는 중요한 요소이다. 수동적 스트레칭과 능동적 스트레칭을 병행하는 고유수용성 신경근 촉진법이 고관절의 가동성에 미치는 영향과 주요 굽힘/폄근의 근전도 활성정도 바탕으로 고유수용성 신경근 촉진 스트레칭의 생체역학적 특징을 고찰하였다. 10명의 20대 학생을 대상으로 고유수용성 신경근 촉진 스트레칭을 실시한 결과 고관절의 가동성이 전담 보조자의 도움을 받았을 때, 평균 $18.9^{\circ}$ 증가하였고 넙다리네갈래근과 뒤넙다리근의 근전도의 활성 또한 고유수용기의 생체역학적 특징을 나타내었다.

고관절염과 근 긴장을 동반한 강직성 척추염의 빠른 기능 회복 (Rapid Functional Enhancement of Ankylosing Spondylitis with Severe Hip Joint Arthritis and Muscle Strain)

  • 황상원;임상희;신지철;박진영
    • Clinical Pain
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    • 제18권2호
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    • pp.121-125
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    • 2019
  • Arthritis of hip joints deteriorates the quality of life in ankylosing spondylitis (AS) patients. Secondary to the articular inflammatory process, the shortened hip-girdle muscles contribute to the decreased joint mobility which may lead to the functional impairment. As the limitation of range of motion (ROM) usually progress slowly, clinicians regard it as a chronic condition and prescribe long-term therapy. However, by short-term intensive multimodal treatment, a 20-year-old man diagnosed as AS with severely limited hip joint ROM who relied on crutches doubled the joint angle and could walk independently only within 2 weeks. The combination included intra-articular steroid injection, electrical twitch obtaining intramuscular stimulation, extracorporeal shock wave therapy, heat, manual therapy, and stretching exercises. The management focused on the relaxation of hip-girdle muscles as well as the direct control of intra-articular inflammation. Hereby, we emphasize the effectiveness of intensive multimodal treatment in improving the function even within a short period.

진공 소결 방식을 이용한 통기성 금형 소재 개발 (Development of Porous Metal Mold Material using Vacuum Sintering Method)

  • 김동원;조규일;김현근;강자연;이원혁;황금철
    • 한국표면공학회지
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    • 제41권5호
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    • pp.245-253
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    • 2008
  • The porous metal material is used for injection metal mold with a great deal of gas production because it makes plenty of gas exhausted through pores formed in the metal mold. A canning HIP method was conventionally used for manufacturing of porous metals, but because of difficulty of process control and high cost of production its application was limited. In this experiment, porous metal mold material was produced by an enhanced vacuum sintering method with simply controlled and economical process and porosities/mechanical properties with variation of sintering temperature and duration time during vacuum sintering were studied. As a result, quality goods were obtained at optimized conditions as follows: sintering temperature of $1230^{\circ}C$, duration time of 2 hr and showed superior properties in wear loss and thermal conductivity and the same properties in hardness, TRS (Transverse Rupture Strength), and thermal expansion coefficient in comparison with those under canning HIP.

고관절 인공관절 치환술 환자의 보행능력 증진을 위한 문제해결 접근: ICF Tool을 적용한 단일사례연구 (The Problem-Solving Approach for Improving Walking Ability in Patient with Total Hip Replacement: Applied ICF Tool for Case Study)

  • 송현승;김선엽
    • 대한정형도수물리치료학회지
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    • 제21권2호
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    • pp.63-71
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    • 2015
  • Background: The purpose of the study, using the ICF Tool in the process of rehabilitation of artificial joint replacement surgery of the hip joint, goal setting and understanding of the problem, through the process of creating intervention strategies, useful clinical practical course for rehabilitation I try to present the data. Methods: Fracture was the left total hip replacement (THR) surgery due to women of 76 years old. I proceed in order screening, evaluation, diagnosis, prognosis, treatment planning and intervention, re-screening. Needs of the patient was walking short distances for using the toilet. In order to improve was carried out arbitration, after you have created a list of issues that limit the ability to walk short distances. Results: It was revealed improved results in self-paced walk test (SPWT) and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) was used to examine whether the goals. In addition, MMT VAS, DGI, and TUG is a detailed goal was improved. Conclusions: It can be shown objectively the results of interventions performed for the purpose of solving the problem which is grasped through clinical Practical course for short-range walking ability enhance patient THR. I considered practical clinical course using the ICF Tool would be useful.

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HIP(열간 등방압) 공정을 이용한 압연 롤 제조 공정의 해석 메커니즘 (Analysis Mechanism of Roll Forming Manufacturing Process using HIP (Hot Isostatic Press) Process)

  • 김웅
    • 소성∙가공
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    • 제32권3호
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    • pp.114-121
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    • 2023
  • During rolling, rolling mill rolls endure wear when shaping metal billets into a desired form, such as bars, plates, and shapes. Such wear affects the lifespan of the rolls and product quality. Therefore, in addition to rigidity, wear performance is a key factor influencing the performance of rolling mill rolls. Conventional methods such as casting and forging have been used to manufacture rolling mill rolls. However, powder alloying methods are increasingly being adopted to enhance wear resistance. These powder manufacturing methods include atomization, canning to shape the powder, hot isostatic pressing to combine the powder alloy with conventional metals, and various wear performance tests on rolls prepared with powder alloys. In this study, numerical simulations and experimental tests were used to develop and elucidate the wear analysis mechanism of rolling mill rolls. The wear characteristics of the rolls under various rolling conditions were analyzed. In addition, experimental tests (wear and surface analysis tests) and wear theory (Archard wear model) were used to evaluate wear. These tests were performed on two different materials in various powder states to evaluate the different aspects of wear resistance. In particular, this study identifies the factors influencing the wear behavior of rolling mill rolls and proposes an analytical approach based on the actual production of products. The developed wear analysis mechanism can serve the future development of rolls with high wear resistance using new materials. Moreover, it can be applied in the mechanical and wear performance testing of new products.

평행봉 Tippelt 동작의 기술 분석 (Kinematical Analysis of Tippelt Motion in Parallel Bars)

  • 백훈식;김민수;문병용;백진호;윤창선
    • 한국운동역학회지
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    • 제17권2호
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    • pp.167-176
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    • 2007
  • The purpose of this study was to offer suitable model for performing Tippelt motion and data for training Tippelt motion through the quantitative kinematical analysis of Tippelt motion in parallel bars. The results of analysing kinematic variations through three-dimensional reflection analysis of three members of the national team as the objects of the study were shown as follows. 1. It seemed that the shoulder-joints which are stretched as much as possible affects the whole Tippelt motion while one is swinging downward. The time of process of the center of mass for the body reaching to the maximum flection point should be quick and body's moving from the vertical phase to the front direction should be controled as much as possible. 2. While one is swinging upward, the stability of flying motion could be made certain by the control of body's rapid moving to the front direction and stretching shoulder-joints and hip-joint to reverse direction. 3. While one is flying upward, the body should be erected quickly and lessening the angle of the hip-joint affects the elevation of flight. When the powerful counter turn motion is performed, the stable motion could be made. As a result of this study, It seems that sudden fall and the maximum stretch of shoulder-joints is important during performing Tippelt motion in parallel bars. Also, it concludes that the maximum bending of hip-joints at the starting point of upward swing, sudden stretch to the reverse direction of shoulder-joints and hip-joints when one is leaving bars, control of body's moving to the front direction, and lessening the angle of hip-joints at the flying phase is important.

특발성 내반슬 여대생의 고관절 가동범위와 등속성 근력 (Range of Motion and Isokinetic Strength of Hip Joint in the College Women with Idiopathic Genu Vara)

  • 김제영;임승길
    • 한국콘텐츠학회논문지
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    • 제14권10호
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    • pp.210-217
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    • 2014
  • 본 연구는 곧은 다리를 가지고 있는 여대생과 특발성 내반슬이 있는 여대생들의 고관절 ROM과 등속성 근력에 대해 비교 분석하여 내반슬의 교정을 위한 운동치료적 접근을 위한 객관적인 자료를 제시하고자 한다. 아울러 새롭게 개발된 운동장비 발로아(2013, Balloa/Adonia/Korea) 동작과정을 통해 휜다리 가진 실험자 내전근 대퇴부와 심층근의 상태를 실험하여 그의 효과와 적용성을 검토한 결과 내반슬이 있는 사람에게는 고관절 외회전 ROM을 증가시키기 위한 신장기법과 고관절 내회전근의 활동성을 억제시키고 외회전근을 단련시킬 수 있는 운동기법이 필요하다. 발로아 기구는 고관절 외회전 ROM을 증가시키며 둔근과 심층근, 내전근을 강화시키며 근력강화 기능으로 내반슬 환자의 교정운동에 효과적임을 나타내었다.

인공 고관절시술자환자의 중심동요 특성에 관한 연구 (Investigation of postural sway characteristics of patients after total hip replacement)

  • 강창수;신승헌;민병우
    • 대한인간공학회지
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    • 제14권2호
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    • pp.87-104
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    • 1995
  • This research investigates the possibility of using the postural sway of patients as a reference for measruing the progress of the disease and healing of patients who received total hip replacement; the progress of the disease by X-ray pictures, the pain felt by the patients, and the difficulties encountered in moving the joints. The measurements on the force platform were taken during a 25 second period standing on both feet and during a 5 second period standing on one foot with both eyes open. The result of the research showed that the trace and area of the overall length of postural sway was a good indicator which represented the healing progress of the patients who received total hip replacement, and the weakening of the muscles and the recovery process for 3 or 4 month after receiving the operation, which did not appear on X-ray pictures, were exhibited on the postural sway. Finally, standing on a single foot represented the healing progress much better than standing on both feet.

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HIP에 의해 합성된 CN nanostructures의 구조 및 전계방출 특성 (Structure and Electron Emission Properties of CN Nanostructures Obtained by HIP Apparatus)

  • 오정근;이양두;문승일;양석현;이윤희;김남수;주병권
    • 한국전기전자재료학회논문지
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    • 제16권8호
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    • pp.723-730
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    • 2003
  • The CN(carbon nitrogen) nanofibers were formed by HIP(high isostatic pressure) process. From the field emission measurement, CN nanofibers shows an excellent characteristics of emitter, better than CNTs and carbon nanofibers. The structures obtained can be divided into three groups : bamboo-like fibers, corrugated structures and bead necklace-like fib res. Emission properties of CN nanofibers were investigated for spacing, between anode and cathode, variation. Turn-on fields was 1.4 v/$\mu\textrm{m}$. The time reliability and light emission test were carried out for about 100 hours. We suggest that CN nanofibers can be possibly applied to the high brightness flat lamp because of low turn-on field and time reliability