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Cement Type 맞춤형 인공고관절의 설계 변수 변화에 따른 Cement 두께 변화와 이에 대한 응력 분석
박흥석,전흥재,윤인찬,이문규,서덕찬,최귀원,Park, Heung-Seok,Chun, Heoung-Jae,Youn, In-Chan,Lee, Moon-Kyu,Seo, Duck-Chan,Choi, Kui-Won 대한의용생체공학회 2006 의공학회지 Vol.27 No.6
The choice of suitable hip implant is one of important factors in the total hip arthroplasty (THA). In clinical view point, an improper adaptation of hip implant might induce abnormal stress distribution to the bone, which can shorten the lifespan of replaced hip implant. Currently, interest in the custom-designed hip implants has increased as studies reveal the significance of geometric shape of patient's femur in modeling and designing the implants. In this study, we have developed custom-designed hip implant models with various sizes, and analyzed the stress distribution in the bone and bone cement using the Finite Element Method. It was found that minimizing the gap between implant stem and femoral cavity is crucial to minimize the stress concentration in the bone.
홍익표,전흥재,이명건,정용식,Hong, Ic-Pyo,Chun, Heung-Jae,Lee, Myung-Gun,Jung, Yong-Sik 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.6
In this paper, we have analyzed the curvature effects of the finite FSS(frequency selective surface) using the 3-D method of moment using the BiCGSTab algorithm as an iterative method. To validate the analysis method in this paper, we compared the RCS(radar cross section) of PEC(perfect electric conductor) sphere with theoretical results and it shows well agreements. The tripole slot FSSs which have many application in military were selected for the investigation of curvature effect and RCS as a frequency characteristics were observed with the variation of the curvature rate. Simulation results shows that curvature effect can significant effect the passband frequency and bandwidth of FSS. We suggest that the curvature effect must be considered at the stage of design FSS application like FSS radome.
최흥섭(Heung Soap Choi),Roman Lanz,전흥재(Heoung Jae Chun) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
This study compares quantitatively and qualitatively the ability of several different repair methods for the advanced composite sandwich structures, to reacquire the pre-damage mechanical properties. The results of this work may be used in the repair of honeycomb sandwich panel structures as used in the spoilers, rudder and floor panels of aircraft. The evaluation tests performed on the Nomex honeycomb sandwich panel with a graphite/epoxy skin include measuring initial mechanical properties by the 4 point bending test and edgewise compression test, and comparing them with the results obtained for damaged and repaired specimens. The damage types studied will be low energy impact, delamination, skin hole and penetrating holes on sandwich panel. One/two-sided cocured, precured skin patches and core replacement will be used in the repair assessment.
박미정(Mi-Jung Park),전흥재(Heung-Jae Chun),변준형(Joon-Hyung Byun) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The applications of composite materials have increased over the past few decades in a variety of structures that require high ratio of stiffness and strength to weight ratios. Recently the thick open section composite beams are used extensively as load carrying members and stiffeners of structural elements. However, most of studies on thick composite beams are limited only to closed section beams. In this study, an open cross-section thick-walled composite beam model which includes coupled stiffness, transverse shear, and warping effects is suggested and the deflections associated with the thick-walled composite beams and thin-walled composite beams are obtained and compared with the finite element analysis results.
박미정(Mi-Jung Park),전흥재(Heung-Jae Chun),변준형(Joon-Hyung Byun) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
The applications of composite materials have increased over the past few decades in a variety of structures that require high ratio of stiffness and strength to weight ratios. Recently the thick open section composite beams are used extensively as load carrying members and stiffeners of structural elements. However, most of studies on thick composite beams are limited only to closed section beams. In this study, an open crosssection thick-walled composite beam model which includes coupled stiffness, transverse shear, and warping effects is suggested and the deflections associated with the thick-walled composite beams and thin-walled composite beams are obtained and compared with the finite element analysis results.
박상준 ( Sang Jun Park ),천명훈 ( Myung Hoon Chun ),전흥재 ( Heung Jae Chun ),김천호 ( Chun Ho Kim ) 한국조직공학과 재생의학회 2009 조직공학과 재생의학 Vol.6 No.4
The retinal disorder in which it shows up while an age gives is caused by a heredity and altitude myopia, a debit, and etc. and it causes the blind. Although retinal disorder is not disease in which fatal disease leads, in including a diabetes, and etc, the retina disease in which it can become with provoke is the trend that recently it is drastically increased along with the increment of the population of old people according to the change of an industrialization and dietary life. However, as to the current retinal disorder, there is a limit. For this reason, the medical treatment of the method in which directly transplant the nerve cells or the glial cells differentiated from the stem cell and retina precursor cell into retina, and the tissue engineered therapy of the neural retina in which it implants into a retina to the tissue engineering technique in which use these cells and biomaterials have been studied. The current review looks into clinical methods and studies on cell and tissue engineering therapy for the retinal disorder.
Jinju Jang(장진주),Taeyang Kwak(곽태양),Young Chul Kim(김영철),Heung-Jae Chun(전흥재),Dohyung Lim(임도형) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
With the introduction of additive manufacturing by selective laser melting, complex shape such as porous structure became to manufacturability. However, it is reported that the additively manufactured Ti-6Al-4V implant has low ductility due to the needle-shaped alpha prime martensitic microstructure, and can be increased through heat treatment. Therefore, this study was to confirm the effect of heat treatment through changes in the microstructure and mechanical strength of porous Ti-6Al-4V implants additively manufactured. In the case of the specimen, an irregular porous structure like bone was applied to the cervical cage. And heat treatment was performed at 650°C for 2 hours and at 800°C for 2 hours. The specimens were measured the change in microstructure with EBSD, and mechanical strength was evaluated according to ASTM F2077 standard. As a result, it was confirmed that alpha prime phase decomposition occurred and precipitation of the beta phase in the specimens heat treated at 650°C and 800°C for 2 hours. And it was confirmed that the particle size of the beta phase grew at 800°C compared to 650°C. In addition, it showed improved ductility compared to the decreased strength at 800°C. We confirmed that heat treatment at 800 °C for 2 hours on the additively manufactured porous cervical cage is a suitable condition to improve the microstructure characteristics and ductility.