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Mandibular reconstruction using customized threedimensional titanium implant
이윤환,유희진,정재아,김덕우 대한두개안면성형외과학회 2018 Archives of Craniofacial Surgery Vol.19 No.2
Mandibular defects lead to severe deformation and functional deficiency. Vascularized osteocutaneous tissue has been widely used to reconstruct the mandible. However, it is technically challenging to shape this type of grafts in such a manner that they resemble the configuration of the mandible. A 48-year-old female patient who underwent anterolateral thigh (ALT) flap coverage after a tongue cancer excision was diagnosed with a tumor recurrence during the follow-up. A wide excision mandibulectomy and mandibular reconstruction with an ALT flap and a titanium implant were performed. The prefabricated titanium implant was fixed to the condyle. Then, an ALT flap was harvested from the ipsilateral thigh and anastomosed. After confirming that the circulation of the flap was intact, the implant was fixed to the parasymphysis. On the radiograph taken after the surgery, the prosthesis was well positioned and overall facial shape was acceptable. There was no postoperative complication during the follow-up period, 1 year and 2 months. The prefabricated implant allows the restoration of facial symmetry without harvesting autologous bone and it is a safe and effective surgical option for mandibular reconstruction.
이윤환 대한의학회 2014 Journal of Korean medical science Vol.29 No.7
With the rapid aging of the population in Korea, the number of older people withdementia is projected to increase, forecasting an epidemic of dementia. Recent trends indementia in several western countries, however, depict a gradual decline in prevalence andincidence. This decrease has been attributed to an improvement in education and livingenvironments, engagement in healthy behaviors, and reduction in the prevalence ofvascular risk factors. In Korea, however, trends in modifiable risk factors do not favor anoptimistic outlook due to the continuous increase in the prevalence of hypertension,diabetes mellitus, and obesity. Given these observations, there is much to be gainedthrough the promotion of healthy lifestyles. Moreover, public health resources need to bedirected toward the provision of health promotion and preventive services, control andmanagement of vascular risk factors, and improvement in the standard of living. Nationwide initiatives to develop and implement policies and strategies to protect cognitivehealth throughout the lifespan should be considered a public health priority.
이윤환,홍순달 한국연초학회 1982 한국연초학회지 Vol.4 No.1
This experiment was carried out to study the influence of temperature on the growth rate and nutrient uptake of tobacco seedlings grown on neutralized charcoal bed during temporary transplanting. The highest growth rate was obtained at tile temperature of 26-22-$l8^{\circ}C$, probably due to fast establishment of roots in the soil. Seedling growth was better in neutralized charcoal bed than in chaffy charcoal bed at each temperature. Days required for fresh weight to reach 20g/10p1ants were shortened by 9~12days as the temperature increased from 18-14-$l0^{\circ}C$ to 26-22-$l8^{\circ}C$. Compared with chaffy charcoal bed, days required for fresh weight to reach 20g/10 plants with neutralized charcoal bed were shortened by about 5 days, 4 days, and 2days at 18-14-$l0^{\circ}C$, 22-18-$l4^{\circ}C$, and 26-22-$l8^{\circ}C$, respectively. Three macronutrient (N, $P_2O_5,\;K_2O$) contents in seedlings increased with increase of temperature. At each temperature, N and $K_2O$ contents in seedlings of neutralized charcoal bed was higher than those of chaffy charcoal bed, whereas that of $P_2O_5$ was low conversely. Nitrate nitrogen from nitric acid that was used to neutralize chaffy charcoal was maintained to tile end of seedling period, providing the source of nitrate nitrogen for the better seedlings.
이윤환 建陽大學校 1996 建陽論叢 Vol.- No.4
A system of judicial review of legislation is divided two types in the point of view as comparative law. The one is type of U.S.A., the other is type of Europe. This system is not results of pure logical research. It is results of history and tradition in the community of law to each country. This study introduces completion and development of a system for the indicial review of legislation in U.S.A. and Europe. It shows the point at issues of the judicial review and suggests the method of improvement in Korean Constitutional law. Therefore, protecting of the constitutional order depend on not only constitutional court but democratic desposition of government, national assembly and intention of nation.