• 한국임상수의학회지
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• 제24권2호
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• pp.280-283
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• 2007

A 6-year-old male dog was referred to Animal Medical Center, Chonbuk National University with large distal extremity abrasion wound to the hind limb by automobile accident. The wound was reconstructed with an autogenous, full-thickness skin mesh graft. The graft was harvested from the ventrolateral abdominal wall and transplanted to the wound. The skin mesh graft survived successfully without any noticeable complications. Successful grafting requires asepsis, an adequately prepared recipient bed through the surgical debridement and lavage, proper harvesting and preparation of the graft. Full-thickness skin mesh graft has lesser skin contraction which prevents formation of scar. Meshing the graft provides more graft flexibility over uneven, convex and concave surfaces and allows adequate drainage. The full-thickness skin mesh graft can be successfully used for the treatment of large distal skin wounds in dogs.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.844-847
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• 2005

A seamless analysis of complex geometry is one of greatly interesting topic. However, there are still gaps between the industrial applications and fundamental academic studies owing to time consuming modeling process. To resolve this problem, an auto mesh generation program based on grid-based approach has been developed for IT-product in the present study. At first, base mesh and skin mesh are generated using the information of entities which extracted from IGES file. Secondly the provisional core mesh with rugged boundary geometry is constructed by superimposing the skin mesh as well as the base mesh generated from the CAD model. Finally, the positions of boundary nodes are adjusted to make a qualified mesh by adapting node modification and smoothing techniques. Also, for the sake of verification of mesh quality, the hexahedral auto mesh constructed by the program is compared with the corresponding tetrahedral free mesh and hexahedral mapped mesh through static finite element analyses. Thereby, it is anticipated that the grid-based approach can be used as a promising pre-processor for integrity evaluation of various IT-products.

• 한국구조물진단유지관리공학회 논문집
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• 제24권1호
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• pp.108-115
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• 2020

본 연구에서는 패류 껍질의 경계조건을 모사한 고연성 시멘트 복합재료의 휨 성능을 평가하였다. 패류 껍질층 경계면 구조를 모방하여 프리캐스트 형식으로 제조된 패널 사이를 후 타설 HDCC로 충전한 실험체와 PE-mesh를 HDCC층의 경계면에 배치한 실험체 등 2가지 경계면 특성을 고려하여 제작한 4종류 실험체의 휨 성능을 평가하였다. 패류 껍질의 경계조건을 모사한 고연성 시멘트 복합재료의 휨 성능 평가결과 일반적인 휨 시험체 대비 층상화 단면을 적용한 모든 실험체의 연성이 증가하였다. 특히 PE-mesh를 삽입하여 층상화한 방법이 가장 우수한 연성을 나타내는 것을 확인하였다. 이는 삽입된 PE-mesh가 층을 분리하는 경계면 역할을 하고, PE-mesh 체눈 내의 각주형 HDCC는 층과 층사이의 부착을 견고히 하는 역할을 하였기 때문이라고 사료된다.

• 대한방사선치료학회지
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• 제29권1호
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• pp.93-101
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• 2017

목 적: 유방암 방사선 치료에서 조직등가보상체의 단점을 해결하기 위해 황동그물망보상체(Brass mesh bolus)가 최근 연구되고 있다. 본 연구의 목적은 국내에 처음 소개되는 황동그물망보상체의 안정성을 조사하고, 표면선량을 평가하고자 하였다. 대상 및 방법: 조직등가보상체 5 mm와 가장 비슷한 황동그물망보상의 두께를 확인하기 위해 표면선량을 측정하였다. 6 MV 선형가속기와 광자극형광선량계(optically stimulated luminescent dosimeter, OSLD)를 사용하였다. 흉곽팬텀을 이용한 2문 대항접선조사를 황동그물망보상체와 조직등가보상체의 비교를 통하여 연구에 적용하였다. 결 과: 표면선량 측정을 기반으로 조직등가보상체 5 mm와 가장 유사한 두께는 황동그물망보상체를 두 겹에 해당되는 3 mm였고, 평균 상대오차율은 0.38 %였다. 흉곽팬텀을 사용한 황동그물망보상체의 표면선량은 조직등가보상체에 비해 약 1.069배 증가하였다. 결 론: 본 실험에서 황동그물망보상체는 기존 조직등가보상체 선량균등도가 향상된 것으로 확인되었다. 실험을 바탕으로 황동그물망보상체가 기본 조직등가보상체를 대체 가능 할 것으로 사료된다. 하지만 다양한 임상적 평가가 필요할 것으로 사료된다.

• Journal of Computational Design and Engineering
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• 제1권1호
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• pp.1-12
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• 2014

In this paper, we propose a new method of reconstructing the hand models for individuals, which include the link structure models, the homologous skin surface models and the homologous tetrahedral mesh models in a reference posture. As for the link structure model, the local coordinate system related to each link consists of the joint rotation center and the axes of joint rotation, which can be estimated based on the trajectories of optimal markers on the relative skin surface region of the subject obtained from the motion capture system. The skin surface model is defined as a three-dimensional triangular mesh, obtained by deforming a template mesh so as to fit the landmark vertices to the relative marker positions obtained motion capture system. In this process, anatomical dimensions for the subject, manually measured by a caliper, are also used as the deformation constraints.

• Archives of Plastic Surgery
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• 제43권1호
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• pp.84-87
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• 2016

Titanium micro-mesh implants are widely used in orbital wall reconstructions because they have several advantageous characteristics. However, the rough and irregular marginal spurs of the cut edges of the titanium mesh sheet impede the efficacious and minimally traumatic insertion of the implant, because these spurs may catch or hook the orbital soft tissue, skin, or conjunctiva during the insertion procedure. In order to prevent this problem, we developed an easy method of inserting a titanium micro-mesh, in which it is wrapped with the aseptic transparent plastic film that is used to pack surgical instruments or is attached to one side of the inner suture package. Fifty-four patients underwent orbital wall reconstruction using a transconjunctival or transcutaneous approach. The wrapped implant was easily inserted without catching or injuring the orbital soft tissue, skin, or conjunctiva. In most cases, the implant was inserted in one attempt. Postoperative computed tomographic scans showed excellent placement of the titanium micro-mesh and adequate anatomic reconstruction of the orbital walls. This wrapping insertion method may be useful for making the insertion of titanium micro-mesh implants in the reconstruction of orbital wall fractures easier and less traumatic.

• Nuclear Engineering and Technology
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• 제49권7호
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• pp.1495-1504
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• 2017

In a previous study, a set of polygon-mesh (PM)-based skin models including a $50-{\mu}m-thick$ radiosensitive target layer were constructed and used to calculate skin dose coefficients (DCs) for idealized external beams of electrons. The results showed that the calculated skin DCs were significantly different from the International Commission on Radiological Protection (ICRP) Publication 116 skin DCs calculated using voxel-type ICRP reference phantoms that do not include the thin target layer. The difference was as large as 7,700 times for electron energies less than 1 MeV, which raises a significant issue that should be addressed subsequently. In the present study, therefore, as an extension of the initial, previous study, skin DCs for three other particles (photons, protons, and helium ions) were calculated by using the PM-based skin models and the calculated values were compared with the ICRP-116 skin DCs. The analysis of our results showed that for the photon exposures, the calculated values were generally in good agreement with the ICRP-116 values. For the charged particles, by contrast, there was a significant difference between the PM-model-calculated skin DCs and the ICRP-116 values. Specifically, the ICRP-116 skin DCs were smaller than those calculated by the PM models-which is to say that they were under-estimated-by up to ~16 times for both protons and helium ions. These differences in skin dose also significantly affected the calculation of the effective dose (E) values, which is reasonable, considering that the skin dose is the major factor determining effective dose calculation for charged particles. The results of the current study generally show that the ICRP-116 DCs for skin dose and effective dose are not reliable for charged particles.

• 한국CDE학회논문집
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• 제11권1호
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• pp.20-26
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• 2006

This paper presents a procedure to compute pencil curves from a triangular mesh which is offset with the radius of a given ball-end mill. An offset triangular mesh has numerous self-intersections caused by an abundance of invalid triangles, which do not contribute to the valid CL-surface. Conceptually, we can obtain valid pencil curves by combining all intersections tying on the outer skin of the offset triangular mesh, i.e., the valid CL-surface. The underlying concept of the proposed algorithm is that visible intersections are always valid for pencil curves, because visible intersections lie on the outer skin of the offset model. To obtain the visibility of intersections efficiently, the proposed algorithm uses a graphics board, which performs hidden surface removal on up to a million polygons per second.

• 한국산업정보학회논문지
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• 제19권3호
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• pp.41-48
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• 2014

This paper proposes a new sensor circuit using a 32 nm carbon nanotube FET (CNFET) technology for artificial skin. For future robotic and prosthetic applications, it is essential to develop a robust and low power artificial skin for detecting the environment through touch. Therefore, a sensor circuit for the artificial skin also has to be developed to detect the sensor signals and convert them into digital bits. The artificial skin sensor is based on a mesh of sensors consisting of a nxn matrix using CNFET, and the sensor outputs are connected to a current monitoring circuit proposed as the sensor circuit. The proposed sensor provides pressure measurements and shape information about pressure distribution.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제29권4호
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• pp.249-256
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• 2003

The lack of sufficient oral mucosa available for intra-oral reconstruction has been dealt with by the use of skin or oral mucosa grafts harvested from donor sites but grafts requires more than one surgical procedures and could cause donor site morbidity. Many investigators have attempted to increase available soft tissue by tissue engineered skin or oral mucosa replacements for clinical applications. But, reconstructed mucosa by several methods have low physical properties such as rolling and contraction. The aims of this study were to develope an in vitro experimental model that maintains an epithelial-mesenchymal interaction by organotypic raft culture, and to characterize biologic properties of three-dimensionally cultured oral mucosa embedded with Polydioxanone mesh by histological and immunohistochemical analysis. The results were as follows; 1. Oral mucosa reconstructed by three-dimensional organotypic culture revealed similar morphologic characteristics to equvalent normal oral mucosa in the point that they show stratification and differentiation. 2. The expression of cytokeratin 10/13 and involucrin in the cultured tissue showed the same pattern with normal oral mucosa suggesting that organotypic co-culture condition is able to induce cellular differentiation. 3. After insertion of polydioxanone mesh, increased tensile strength were observed. These results suggest that three-dimensional organotypic co-culture of the oral mucosa cell lines with the dermal equvalent consisting type I collagen and fibroblasts reproduce the morphologic and immunohistochemical characteristics similar to those in vivo condition. And increased physical properties by use of polydioxanone mesh will helpful for clinical applications.