• Archives of Plastic Surgery
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• v.46 no.6
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• pp.603-607
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• 2019

During a full-thickness skin graft procedure, the thickness of the harvested donor skin is adjusted based on the location of the recipient site and the judgment of the surgeon. Conventionally, the thickness of the harvested skin is roughly adjusted using surgical instruments such as scalpels and scissors. However, this method is not only time-consuming, but also requires effort to obtain both the desired thickness of the harvested skin and a smooth surface of that skin. Moreover, there is a possibility of skin perforation. Hence, the authors devised a method of adjusting harvested skin thickness using the Versajet Hydrosurgery System. The Versajet device is a handheld hydrosurgical tool that delivers a high-speed jet stream of saline solution, which enables the precise debridement of tissue. This method makes it easier and faster for the surgeon to obtain the desired thickness of harvested skin. In addition, by obtaining a smooth surface and an even thickness of harvested donor skin, this technique may lead to improved graft viability.

• Radiation Oncology Journal
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• v.14 no.4
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• pp.339-345
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• 1996

Purpose : This study was performed for adequate irradiating tumor area when 6 MV linear accerelator photon was used to treat the head and neck tumor. The skin surface dose and maximum build-up region was measured by using a spoiler which was located between skin surface and collimator. Methods : A spoiler was made of tissue equivalent material and the skin surface dose and maximum build-up region was measured varing with field size, thickness of spoiler and interval between skin and collimator. The results of skin surface dose and maximum build-up dose was represented as a build-up ratio and it was compared with dose distribution by using a bolus. Results : The skin surface dose was increased with appling spoiler and decreased by distance of the skin-spoiler separation. The maxium build-up region was 1.5 cm below the skin surface and it was markedly decreased near the skin surface. By using a 1.0-cm thickness spoiler, Dmax moved to 5, 10.2, 12.3 13.9 and 14.8 mm from the skin surface by separation of the spoiler from the skin 0, 5, 10, 15. 20 cm, respectively. Conclusion : The skin surface dose was increased and maximum build-up region was moved to the surface by using a spoiler. Therefore spoiler was useful in treating by high energy photon in the head and neck tumor.

• KSBB Journal
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• v.29 no.1
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• pp.42-49
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• 2014

The aim of this study was to develop a composite human skin equivalent for wound healing. Collagen type1 and acellular dermal matrix powder were utilized as the scaffold with dermal fibroblasts and keratinocytes for the development of a composite human skin equivalent. Fibroblast maintained the volume of composite skin equivalent and also induced keratinocytes to attach and proliferate on the surface of composite skin equivalent. The composite human skin equivalent had a structure and curvature similar to those of real skin. Balb-C nu/nu mice were used for the evaluation of full-thickness wound healing effect of the composite human skin equivalent. Graft of composite skin equivalent on full-thickness wound promoted re-epithelialization and granulation tissue formation at 9 days. Given the average wound-healing time (14 days), the wound in the developed composite skin equivalent healed quickly. The overall results indicated that this three-dimensional composite human skin equivalent can be used to effectively enhance wound healing.

• Proceedings of the Korea Society for Simulation Conference
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• 2001.10a
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• pp.255-259
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• 2001

A skin tissue system is considered, whose configuration is electrically modelled by a layer over the infinite half space. The problem is to estimate the layer\`s thickness and respective conductivity from the measured impedance between the electrodes placed on the skin surface. A simulation is taken place as the optimization problem which is to minimize the norm between the \"measured\" and the solution for the assumed parameters.arameters.

• Korean Journal of Head & Neck Oncology
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• v.4 no.1
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• pp.21-28
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• 1988

Skin replacement in large cheek defects after excision of benign or malignant tumor on the face is a challenging task. The physical characteristics of cheek skin are matched best by adjacent skin. Various methods of reconstructing of the facial surface such as forehead flap, distant flap, or a full thickness or split thickness skin graft have replaced adjacent tissue for coverage in many cases. We have reviewed ten cases of aesthetic reconstruction of the face after resection of the facial skin tumor within the last 5 years. The first group of 3 patients were reconstructed with split thickness skin graft from the scalp or lower abdomen. The second group of patients were reconstructed with cheek flap. The third group of 3 patients were reconstructed with cervicofacial flap. The last 2 patients were reconstructed with nasolabial flap & island falp respectively. The advantages from our experience with various method of coverage are its hidden donor area & good color match with the facial skin & increased success rate.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.10a
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• pp.543-546
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• 2002

This paper discussed micro - structure of skin concrete to understand transport properties from surface and seek thickness from surface which is seriously influenced on durability. Concrete at nearer surface has high porosity relative to inner concrete. The porosity of concrete and ISAT value at region from surface to 20 mm depth is decreased with depth. On the other hand, according to the result of ASTM C 1202 with specimen thickness, critical depth which affects fast ionic penetration through interfacial transition zone (ITZ) equals 35mm and the critical depth would be directly influenced by the effects of ITZ on chloride diffusion unrelated with W/C ratio.

• Journal of Sensor Science and Technology
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• v.26 no.2
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• pp.141-147
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• 2017

A pressure sensor in pulse measurement system is a core component for precisely measuring the pulse waveform of radial artery. A pulse sensor signal that measures the pulse wave in contact with the skin is affected by the temperature difference between the ambient temperature and skin surface. In this study, we found experimentally that the signal changes of the pressure sensors and a temperature sensor were caused by the temperature of the wrist surface while the pressure sensor was contacted on the skin surface for measuring pulse wave. To observe the signal change of the pulse sensor caused by temperature increase on sensor surface, Peltier device that can be kept at a set temperature was used. As the temperature of Peltier device was kept at $35^{\circ}C$ (the maximum wrist temperature), the device was put on the pulse sensor surface. The temperature and pressure signals were obtained simultaneously from a temperature sensor and six pressure sensors embedded in the pulse sensor. As a result of signal analysis, the sensor pressure was decreased during temperature increase of pulse sensor surface. In addition, the signal difference ratio of pressure and temperature sensors with respect to thickness of cover layer in pulse sensor was increased exponentially. Therefore, the signal of pressure sensor was modified by the compensation equation derived by the temperature sensor signal. We suggested that the thickness of cover layer in pulse sensor should be designed considering the skin surface temperature.

• Applied Microscopy
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• v.44 no.2
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• pp.53-60
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• 2014

In the present study, we investigated the effects of Polygonum tinctoria Niram (PTN) on atopic dermatitis (AD) in BALB/c mice induced by 2,4-dinitrochlorobenzene (DNCB). They were divided into four groups; Control, DNCB, DNCB+1%PTN (1% PTN extract) and DNCB+5%PTN (5% PTN extract), for evaluating the change of appearance of skin surface, skin hydration, thickness of epidermis and mast cell numbers during 4 weeks. PTN suppressed symptoms of AD in appearance of skin and increased skin hydration for DNCB+1%PTN and DNCB+5%PTN. Treatment with PTN significantly decreased the levels of eosinophils. In histopathological examination, DNCB+1%PTN and DNCB+5%PTN significantly reduced the thickness of epidermis and number of mast cell in dermis. These results suggested that the PTN improved symptoms of AD in BALB/c mice.

• Journal of Environmental Science International
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• v.17 no.7
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• pp.809-816
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• 2008

The oriental ore minerals, which mainly consisted of talc, actinolite, sericite, and halloysite were developed, and then used to examine the healing effect on the skin wound in rats. Full-thickness square wounds were formed on the backs of rats after the hairs on the dorsal surface were shaved. The ore minerals were applied to examine the healing effect from day 0 to 15 after wounding. Notable wound healings in terms of congestion around the wound, wound contraction and epithelialization were found in ore mineral-treated groups. Moreover, microscopic results revealed the formation of epithelial layer, hair follicles and progressive angiogenesis in ore mineral-treated groups, while complete epithelial layer could not be found in the control. These results suggest that ore minerals from Korean indigenous ores may have wound healing effect on the skin injury in rats.

• Polymer(Korea)
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• v.36 no.4
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• pp.461-469
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• 2012

The surface modification and characterization of Ar-plasma treated polypropylene (PP) blend are investigated using x-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and contact angle measurement. An increase in Ar-plasma treatment time leads to an increase in wettability, oxygen containing polar functional groups, the amount of talc, and surface roughness on the PP blend surface. A careful observation using SEM indicates that there exists a skin layer consisting of only PP component. The difference in viscosity between PP and rubber particles facilities the formation of skin layer. However, it is found that an increase in Ar-plasma treatment time helps to decrease the thickness of skin layer. Additional methodologies for the elimination of skin layer during injection molding are also discussed. The surface modification and morphological alteration induced by Ar-plasma treatment provides a hydrophilic state, followed by the improvement in wettability, on the PP blend surface.