http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 강희동 (검색결과 123 건)
- 무료
- 기관 내 무료
- 유료
-
-
강희동,이상윤,최희동,김도성,도시흥 경북대학교 센서기술연구소 1992 연차보고서 Vol.1992 No.-
TLD 방사선 센서는 이온화 방사선에 대한 감도와 안정성이 높고 동작원리가 간단하며, 소형화와 장기간에 걸친 집적선량의 측정이 가능하며 넓은 선량과 에너지영역에서 선형적인 응답특성을 가지므로^1.2) 개인피폭선량측정 및 환경방사능 평가에 있어 경제성, 휴대성, 신뢰성을 가진 방사선 센서로 많은 각광을 받고 있어 종래에 가장 많이 사용되어온 film badge를 점차적으로 대체해 가고 있다. 본 연구에서는 TLD 방사선 센서를 개발하기 위하여 조직등가인 LiF:Mg, Cu, p와 비조직등가이나 방사선에 대한 감도가 좋은 CaSO_4:Tm/Dy와 BaSO_4:Eu 열형광체의 제작과정을 확립하였다. 그리고 제작한 열형광체를 TLD 방사선 센서로 실용화할 수 있도록 열형광체 분말을 접착성 매질인 PTFE로 중합한 디스크형의 TLD 방사선 센서 소자를 개발하였으며, 금속필터를 사용한 TLD badge를 개발하여 CaSO_4:Tm의 저에너지 X선 영역에서의 에너지의존성을 보상하였다. 또한 전장치를 개인용 컴퓨터로 제어할 수 있고, 열형광 현상의 물리적 특성연구가 가능하며, 여러 종류의 TLD 방사선 센서를 판독할 수 있을 뿐만 아니라 측정 가능한 선량범위가 넓은 경제적인 TLD 방사선 센서 판독장치를 개발하였다. The TL phosphors of LiF:Mg, Cu,P CaSO4:Tm/Dy and BaSO_4:Eu are prepared and TLD radiation sensors are fabricated by polymerizing the PTFE with these TL phosphors at specified procedure and conditions. The highly sensitive LiF:Mg, Cu,P TL phosphors are obtained when the LiF doped with 0.8mol% Mg, 0.05mol% Cu and 2.5mol% P are sintered in N2 atmosphere at 860℃ for 30minutes. The optimun polymerization temperature and time for fabrication of LiF:Mg, Cu,P-PTFE TLDs are 490℃ and 5minutes in air, respectively. The linear dose range of these TLDs to γ ray is 10mGy10Gy and fading rate is less than 1%/6month. The TL phosphors of the CaSO_4:Tm and CaSO_4:Dy are obtained when the CaSO_42H_2O doped with 0.5mol% Tm and 1.0mol% Dy are sintered in atmosphere at 600℃ for 2hours. The optimun polymerization temperature and time for fabrication of CaSO_4Tm/Dy-PTFE TLDs are 370℃ and 1 hour in air, respectively. The linear dose renge of these TLDs to γ is 250μGy-5Gy and fading rate is less than 2%/month. The energy dependence of CaSO_4Tm-PTFE TLD has been compensated by combining the TL responses of one bare TLD and five TLDs filtered with 1.0㎜ Al, 0.2㎜ Cu, 0.5㎜ Cu, 1.5㎜ Cu, 2.0㎜ Pb respectively. The BaSO_4:Eu TL phosphors are obtained by firing at 1000℃ in air a mixture of BaSO_4 powder with 1mol% Eu(Eu_2O_3), 6mol% NH_4Cl and 5mol%(NH_4)_2SO_4 which were co-preciptated in dilute sulfuric acid and then dried. The optimun polymerization temperature and time for fabrication of BaSO_4:Eu-PTFE TLDs are 380℃ and 2 hour in air, respectively. The linear dose range to γ rays is 30mGy-20Gy and fading rate is about 10%/60hours. A readout system for TLD radiation sensors is constructed and its characteristics are also investigated. The thermoluninescent lights are detected by a PM tube and converted to frequency. TLD sensors are heated by platinum heater and the heating rate is linearly variable by SCR phase control. Measurement of the glow curve and control of the whole system have been done by a personal computer equiped with an interface board. The lower detection limit of the system is about 250μGy. In this system, a personal computer is connected to the readout system reducing its cost and enhances the efficiency of data analysis, assessment and management of radiation dose.
-
Hardy-Cross법을 이용한 CO2 냉동기용 내부열교환기의 열전달 특성 연구
강희동,김욱중,서태범 대한설비공학회 2005 설비공학 논문집 Vol.17 No.1
The heat transfer characteristics of an internal heat exchanger for CO2 refrigeration cycle are numerically investigated. The numerical model is verified using the published experimental results for the concentric tube type internal heat exchanger. The Hardy-Cross Method gives very good agreement between the calculation and experimental results on the heat transfer rates and exit temperatures. Also, appropriate combination of heat transfer correlations is found. The operating parameters of the heat exchanger are calculated at transcritical region of CO2. The heat transfer rate of the counter flow type heat exchanger shows the 32% greater than that of the parallel flow type heat exchanger. The increase of heat exchanger length enhances the heat transfer rate. The thermodynamic characteristics and heat transfer coefficient of CO2 in the internal heat exchanger are estimated.
-
-
-
강희동,임경수,김원영,오범진,김원 대한응급의학회 2004 대한응급의학회지 Vol.15 No.3
P u r p o s e: With many advantages, Electronic Medical Record (EMR) systems have been adopted by numerous medical institutions. However, medical personnel, the direct users of the system, have a negative opinion of it. Especially, medical personnel at the emergency department, in which the most rapid services are required, have a more negative opinion. We performed this study to improve the system from the view points of time factors, which are the most unsatisfactory to medical personnel. M e t h o d s: We compared the time consumed for making p a t i e n t s’medical records before and after the adoption of EMR system in Asan Medical Center. A questionnaire regarding contentment and the presumptive time consumption of the EMR were answered by emergency medical personnel. R e s u l t s: The actual time consumed for the written and the electronic records was the same. However, from the survey, the time consumed on the electronic recording system was perceived to be longer by medical personnel. 46.7% of the doctors and 53.8% of the nurses answered that EMR was convenient, and 59.3% of them agreed to continue using the system. C o n c l u s i o n: If the EMR system is developed for user convenience, it can also be useful in emergency care as well. Therefore, emergency medical personnel must participate in the initial period of EMR system development.
-
강희동,강길현,류대식,오세현,이부수,김종욱 대한응급의학회 2009 대한응급의학회지 Vol.20 No.2
Mediastinal teratoma is a rare mediastinal tumor. Patients with mediastinal teratoma are usually asymptomatic and are diagnosed incidentally with chest radiography or CT, but they may develop symptoms via a rupture into adjacent structures, which results in chemical pneumonia, massive hemoptysis, hemothorax, pericardial effusion, or respiratory distress. We report a case of a ruptured teratoma in a 31- year-old female presenting with cough and brown-colored sputum. Chest radiography and computed tomography of the chest showed an inhomogenous anterior mediastinal mass with fat and fluid component. It was successfully treated by surgical resection. Although mature teratomas are rare, we should be familiar with the unique CT features of a ruptured teratoma to make sure of a correct diagnosis.
-
-
강희동,오세현,정상구 대한응급의학회 2017 대한응급의학회지 Vol.28 No.4
We presented a patient with cerebral decompression sickness, who showed predominant vasogenic edema on a 3.0 Tesla (3T) magnetic resonance imaging (MRI) findings, including diffusion-weighted image (DWI) and apparent diffusion coefficient (ADC) mapping. Within minutes of surfacing, he developed paresis of the right lower limb. During transport, he began shivering, followed by severe spasm that eventually progressed to a tonic-clonic seizure. Emergent hyperbaric oxygen therapy (HBOT) was performed with U.S. Navy treatment table 6A after a treatment of seizure activity. Brain MRI was performed after hyperbaric oxygen therapy to detect any cerebral lesions, which showed subcortical hyperintensity signal changes in the left fronto-parietal region on the ADC map. Overlying cortical hyperintensity on DWI sequences and cortical hypointensity on the ADC map were simultaneously observed. Moreover, these findings disappeared in a followup MRI with complete resolution of symptoms. These findings indicate that vasogenic edema can cause cerebral decompression sickness (DCS) and that 3T MRI with DWI and ADC mapping may be useful for diagnosing cerebral DCS. In addition, these findings suggest that DW-MRI may also be useful in predicting the prognosis of cerebral DCS.
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
