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정대한,정훈,류은웅,박철언,변재용,여승근,박문서 대한이비인후과학회 2010 대한이비인후과학회지 두경부외과학 Vol.53 No.5
Background and ObjectivesZZIt is essential to understand gas physiology of mastoid cavity to study the pathophysiology of middle ear diseases, and the surface area and volume of mastoid mucosa are important parameters for evaluating gas physiology. However, the surface area and mastoid volume of the mastoid cavity have not been practically measured yet. Therefore, we measured and compared surface area and volume of the mastoid cavity before and after mastoidectomy using a virtual mastoidectomy model. Subjects and MethodZZWe performed a virtual mastoidectomy using 10 cases of temporal bone CT indicating pneumatic mastoid. First, we removed all air cells after outlining with irregular AOI function after loading axial CT images to Image-Pro Plus 4.0. Then we filled the removed area with equal planes using local equalization filter. Finally, we calculated and compared the total surface area, volume and area to volume (A/V) ratio by estimating their circumference and area. ResultsZZThe mean surface area of pneumatized mastoid cavity was 127.8 cm2 (range: 94.2-165.3 cm2), and the mean volume was 7.1 cm3 (range: 5.2-11.0 cm3). The mean surface area and volume were altered to 42.8 cm2 (range: 35.9-55.0 cm2) and 12.6 cm3 (range: 10.3-18.7cm3), respectively, after virtual mastoidectomy. As a result, the A/V ratio decreased from 18 to 3.4 after a virtual mastoidectomy in the pneumatic mastoid cavity. ConclusionZZWhen a complete mastoidectomy is performed in the pneumatic mastoid, the surface area is decreased by one third compared to a relatively minor increase in volume. Therefore,the surface area per unit volume is expected to greatly decrease after mastoidectomy. Some physiologic problems occurring after mastoidectomy could be more accurately explained using a virtual mastoidectomy model. Korean J Otorhinolaryngol-Head Neck Surg 2010;53:284-9
정대한,김상만,신귀현,노회은,이종인 경상대학교 농업생명과학연구원 2017 농업생명과학연구 Vol.51 No.2
The purpose of this study is to find methods of enhancing arboretum’s competitiveness and suggest efficient ways in making other arboretum afterwards by grasping decision factors that make people visit an arboretum operating in Korea. For this study it was conducted monova and discriminant analysis, multiple regression analysis. I researched the relationship between satisfaction and visitor’s characteristic, and then found there are some differences only in revisitors, though other factors had nothing to do with results. The satisfaction of facility and tour effect is higher in revisitors compared with first visitors. In the gender aspect, women were satisfied with the distinctive things more highly than men among five lower factors of satisfaction. Also, in the age group aspect, the overall satisfaction and satisfaction in the scenary were ranked higher from 20 to 30 than from 40 to 50. The findings will provide imformation on the satisfaction of the arboretum visitors and enhance arboretum’s competitiveness.
인발공정에 의해 강소성 가공된 AA1070선재의 미세조직 및 기계적 특성
정대한,이성희,Jeong, Dae-Han,Lee, Seong-Hee 한국재료학회 2020 한국재료학회지 Vol.30 No.6
A commercial AA1070 alloy for electrical wire is severely deformed by drawing process in which a rod with an initial diameter of 9mm into is reduced to a wire of 2mm diameter. The drawn AA1070 wire is then annealed at various temperatures from 200 to 450 ℃ for 2h. Changes in microstructure, mechanical properties and electrical properties of the specimens with annealing temperature are investigated in detail. The specimen begins partially to recrystallize at 250 ℃; above 300 ℃ it is covered with equiaxed recrystallized grains over all regions. Fiber textures of {110}<111> and {112}<111> components are mainly developed, and {110}<001> texture is partially developed as well. The tensile strength tends to decrease with annealing temperature due to the occurrence of recovery or/and recrystallization. On the other hand, the elongation of the annealed wire increases with the annealing temperature, and reaches a maximum value of 33.3 % at 300 ℃. Electric conductivity of the specimens increases with annealing temperature, and reaches a maximum value of 62.6 %IACS after annealing at 450 ℃. These results are discussed in comparison with those for the other aluminum alloy.
날아가는 섬광탄이 연료탱크 수평핀에 미치는 복사열전달 연구
정대한,강치행,김시태,Jung, Daehan,Kang, Chihang,Kim, Sitae 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.2
In this paper, the effect of unsteady radiation on the horizontal fin of an external fuel tank by flame of a flying flare was analysed to see the temperature increase of the fin and the thermal impact on the fin. Radiation between two surfaces was calculated using the concept of radiation resistance of surface and space including radiation, irradiation and shape factor for two flying trajectories of a flare, maximum temperature of 2200 K, emissivity of 0.95, flying velocity of 30 m/s, and thermal surface area of $0.01m^2$. The result shows that the temperature increase of the fin is 0.236 K, and the thermal effect on the fin is ignorable. And it was found that temperature is increased a little because small amount of heat energy can be radiated due to the short exposure time to the heat source.
말기 암 환자에서 감염에 대한 항생제 사용 - 대한가정의학회 완화의학연구회 세미나에 기초한 -
정휘수,김대영,송경포,대한가정의학회 완화의학연구회,서상연,Jeong, Hwee-Soo,Kim, Dae-Young,Song, Kyoung-Po,Korean Family Medicine Palliative Medicine Research Group, Korean Family Medicine Palliative Medicine Research Group,Suh, 한국호스피스완화의료학회 2007 한국호스피스.완화의료학회지 Vol.10 No.1
말기 암 환자에서 감염에 대한 항생제 사용은 의학적 문제에 대해 해결해야 하는 의무와 임종을 앞둔 시점에 생명 연장으로 인한 환자의 고통증가에 대한 부담으로 명확하게 결정하기 어려운 문제이다. 대한가정의학회 완화의학연구회 세미나에서는 65세 남자환자로 직장암 말기에 악취를 동반한 광범위한 피부감염증으로 입원 후 국소 항생제 치료로 증상 호전 중 임종을 맞이한 증례를 토의하였고, 이를 통해 말기 암 환자에서 항생제 치료에 대한 문헌고찰과 토론 후 다음과 같이 의견을 제시하고자 한다. 항생제 치료 목적에 있어 증상조절을 고려해야 하며, 특히 요로계 감염이 있는 경우는 증상조절을 위해 항생제를 사용한다. 또한 감수성 검사를 통해 적절한 항생제를 처방해야 한다. 무엇보다도 우선적으로 고려되어야 할 점은 환자입장에서 무엇이 가장 득이 되는지를 생각하고, 항생제 사용에 대해 환자와 가족들의 의견을 존중하여 판단하며, 환자나 가족이 적극적으로 치료를 요구하는 경우에는 치료로 인한 득실에 대해 환자와 토의를 한 후 사용한다. Decision-making of antibiotics use in infected patients with terminal stage of cancer was difficult for physicians, because of responsibility of solving a medical problem and burden on patients distressed by worthless life expansion. Korean Family Medicine Palliative Medicine Research Group discussed this subject using a case of a 65 year-old male having terminal stage of sigmoid colon cancer with extended cutaneous infection who was treated local antibiotics, improved but expired at the 12th hospital day. We reviewed related literatures and proposed a guide for antibiotics use in inferred patients with terminal stage of cancer. Antibiotics should be used for symptom control as major indication, especially when patients suffered from urinary symptoms. Appropriate antibiotics should be chosen based or sensitivity test. the most important considering factor should be patient and family members' wish about antibiotics use.