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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
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.
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.
T-103 훈련기의 환기와 난방 시스템 개선에 관한 연구
정대한,Jung, Daehan 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.3
In this paper, the ventilating and heating system of T-103 trainer aircraft were investigated and redesigned to improve its poor performance. The ventilation system of the trainer was designed to increase the mass flow rate of fresh air by using air intake valves. The flow-in air through the air intake valve is supplied to the cabin by the ram effect of aircraft and the propeller. And the additional heating system was installed to improve the temperature of the cabin inside. The wasted heat from the exhaust gas of the engines was used as heat source of the additional heating system by installing an heat exchanger around the exhaust nozzle. The additional fresh air and the heated air enter the cabin via two ducts mounted under the instrument panel and behind the pedal in the cabin. The additional ventilating and heating system can be controlled by the first pilot and the secondary pilot individually using the control knob equipped separately. After mounting the additional ventilating and heating system, evaluations such as inspection of parts and component, ground run-up test, in-flight test, user test, etc. were conducted. The result of the tests was sufficient to meet the requirements of the manuals, and the pilots were satisfied with the additionally mounted systems.