• 대한화상학회지
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• 제24권2호
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• pp.43-45
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• 2021

Magnetic Resonance Image (MRI) has been used as a safe, conventional and harmless diagnostic tool. However, thermal injuries have frequently been reported during MRI scanning due to the heat generated by the reaction with the magnetic field. It is recommended that metal-containing monitoring devices such as pulse oximetry and ECG monitoring leads should be removed prior to the start of the MRI scan, but these monitoring devices are inevitably placed in children or patients in the intensive care unit who have low compliance with the scan. Since the interaction between the metal probe or wire loop of pulse oximetry and the magnetic field can result in high thermal conduction, full-thickness burn can occur over the entire body surface during the MRI examination. Several cases of thermal burns from pulse oximetry on the fingers have been reported. However, we present a case of a full-thickness burn arising left earlobe in a 2-month-old child caused by the high conduction heat from pulse oximetry metal probe.

• Bulletin of the Korean Chemical Society
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• 제24권8호
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• pp.1097-1101
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• 2003

The cubic and quartic anharmonic force field of malonaldehyde is calculated using density functional theory at the B3LYP/6-31G(d,p) level, and used to simulate coherent infrared vibrational spectra. 12 normal modes are included in the simulation, and the Arnoldi method is employed for the diagonalization of the Hamiltonian. The calculated three pulse infrared signals in the k1 + k2 - k3 direction show signatures of the intramolecular hydrogen bond couplings between the C=O stretch, H-O-C bend and O-H stretch vibrations.

• Annals of Clinical Neurophysiology
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• 제24권1호
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• pp.21-25
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• 2022

The newly identified frontal aslant tract (FAT) that connects the posterior Broca's area to the supplementary motor area is known to be involved in speech and language functions. We successfully intraoperatively monitored FAT using cortico-cortical evoked potentials generated by single-pulse electrical cortical stimulation in a patient with oligodendroglioma.

• 대한한의진단학회지
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• 제9권2호
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• pp.10-24
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• 2005

Background and Purpose: Feeling the pulse is based on the pulse condition and alteration to observe the condition of the human body's health and by using a healthy person's pulse as a standard we are able to analyze the patient's pulse to find the attacked channel and collateral, viscera and bowels and understand the pathology such as diseases caused by exogenous evil, disorder of internal organs, and seven modes of emotions. Observing the color and shade of the patient's face, listening carefully to the sound of the patient, and feeling the pulse are methods in accordance with Su Wen 'Plain Questions', 'The Classic on Difficulty' (5th century B.C. Bianque), 'The Classic of Sphymology' (280 A.D. Wang Xi), 'Pulse Formulas' (1189 A.D. Cui Jiayan), and is systematically edited for those who have started studying to easily reach the profound state. Therefore, 'The Elementary Course for Medicine' has been used from ancient times as the textbook for diagnostics. Methods: In this Study, we will inspect commonly used pulse feeling methods, the inch, bar, cubit thesis, the viscera and bowels thesis from The Elementary Course for Medicine and inquire the difference of the text from 'Plain Questions of Huangdi's Internal Classic', 'Treatise on Febrile Diseases', 'Classic on Difficulty'. Results and Conclusion: 1. In 'The Elementary Course for Medicine' the site of the wrist along the pulsation of the radial artery is divided into inch, bar, cubit and has defined the inch, bar, cubit crossways. 2. In 'The Elementary Course of Medicine' the inch, bar, cubit for the left hand and right hand is subjected to each viscera and bowel. By assigning the left hand's inch, bar, cubit to the cardial orb, the hepatic orb, the renal orb, and the right hand's inch, bar, cubit to the pulmonic orb, the splenic orb, the vital gate it has been able to feel the pulse for each viscera and bowel by using the interpromoting and interacting relation of the five evolutive phases.

• Journal of Advanced Marine Engineering and Technology
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• 제38권7호
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• pp.916-922
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• 2014

본 논문에서는 12-펄스정류기의 고조파 저감을 위해 12-펄스정류기의 커패시터 중앙 DC버스에 보조전원장치의 설치를 제안하였다. 그리고 이 장치에 의해 고조파가 감소되는 이론적인 배경을 다루었으며 부하전류의 크기에 따라 보조전원장치가 어떻게 제어되어야 하는지를 밝혔다. 본 논문에서 제안한 보조전원장치는 구형파 전압원을 적용함으로써 능동필터와 같은 다른 방식에 비해 시스템 구조가 간단하고 보다 저렴하다. 본 논문에서 제안하는 12-펄스정류기 고조파 저감법의 검증을 위해 소프트웨어 PSIM을 활용하였으며 제안된 방식의 유효성을 확인하였다.

• 한국환경생태학회지
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• 제24권2호
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• pp.202-208
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• 2010

본 연구는 박쥐의 연령 증가에 따른 발성 초음파의 변화를 파악하기 위하여 집박쥐(Pipistrellus abramus)를 대상으로 생후 어린 개체가 발산하는 음을 이용하여 세부 분석을 실시하였다. 분석결과 어린 개체는 성체와 다른 복합적이고 다양한 형태의 시그널을 발산하는 것으로 확인되었다. 펄스의 형태는 생후 2일차에는 하모니의 수가 많고 불규칙적인 시그널 형태를 보였으며, 생후 10일차부터 20일 까지는 완만한 FM 시그널 형태를 보였다. 생후 30일 경에는 짧은 시간의 FM 시그널 형태를 보였으며, 40일 이후 점차 성체와 유사한 형태의 시그널을 발산하였다. 어린개체의 성장에 따른 발성 시그널을 분석한 결과 각각의 분석 항목별로 유의적인 차이가 있는 것으로 나타났다. 즉, 펄스의 지속시간(p<0.001), 펄스 간격(p<0.001), 하모니의 수(p<0.001)는 새끼의 연령이 증가할수록 감소하는 경향을 보였으며, 최고진동수(p<0.001), 개시진동수(p<0.001), 종말진동수(p<0.001)는 증가하는 결과를 보였다. 특히 펄스 간격은 생후 5일차에 가장 큰 변화를 보였으며, 그 외 펄스 지속시간, 최고진동수, 개시진동수, 종말진동수는 생후 25일차에 가장 큰 변화를 나타내었다.

• The Korean Journal of Physiology
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• 제24권2호
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• pp.377-388
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• 1990

Ca movements during the late plateau phase in rabbit atrium implicate Na-Ca exchange. In single atrial cells isolated from the rabbit the properties of the inward current of Na-Ca exchange were investigated using the whole cell voltage clamp technique. The inward currents were recorded during repolarization following brief 2 ms depolarizing pulse to +40 mV from a holding potential of -70 mV. Followings are the results obtained: 1) When stimulated every 30 sec, the inward currents were activated and reached peak values $6{\sim}12\;ms$ after the beginning of depolarizing pulse. The mean current amplitude was 342 pA/cell. 2) The current decayed spontaneously from the peak activation and the timecourse of the relaxation showed two different phases: fast and slow phase. 3) The recovery of the inward current was tested by paired pulse of various interval. The peak current recovered exponentialy with a time course similar to that of Ca current recovery. 4) Relaxation timecourse was also affected by pulse interval and time constant was reduced almost linearly according to the decrease of pulse interval between 30 sec and 1 sec. 5) The peak inward current was increased by long prepulse stimulation, Bay K, isoprenaline or c-AMP. 6) The relaxation time constant of the inward current was prolonged by Bay K or c-AMP, and shortened by isoprenaline. From the above results, it could be concluded that increase of the calcium current potentiates and prolongs intracellular calcium transients, while shortening of the timecourse by isoprenaline or short interval stimulations might be due to the facilitation of Ca uptake by SR.

• 한국정밀공학회지
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• 제24권3호
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• pp.16-22
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• 2007

• 대한간호학회지
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• 제36권1호
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• pp.114-126
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• 2006

Purpose: This study was performed to evaluate the pre-emptive analgesic effects of a small dose of intravenous ketamine on postoperative pain in patients undergoing a hysterectomy. Method: Sixty patients undergoing a hystrectomy under general anesthesia were randomly allocated to 2 groups. The experimental group(30 patients) received 0.3mg/kg of ketamine after induction of anesthesia, approximately 5 min prior to surgery, but the control group(30 patients)did not receive ketamine. Data was collected in a double-blind manner from April 1st, to October 30th, 2004. Postoperatively, the patients used a patient-controlled analgesia(PCA) pump. Blood pressure, pulse rate, pain, anxiety, count of times pressing the PCA button, administeration of additional analgesics and side effects of ketamine were measured at 1 hour, 3 hours, 6 hours and 24 hours after the operation. Result: There were no statistical differences in blood pressure, pulse rate, pain and anxiety between the experimental and control groups. There were statistical differences in blood pressure, pulse rate, pain and anxiety during the 24 hours postoperatively. In the experimental group, the number of times pressing the PCA button and administering additional analgesic drugs were significantly lower than those of the control group. Conclusion: A 0.3 mg/kg dose of ketamine given at approximately 5 min before surgery resulted in decreasing the number of times pressing the PCA and the administration of additional analgesics.

• 비파괴검사학회지
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• 제22권3호
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• pp.292-303
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• 2002

본 연구에서는 모르타르와 콘크리트의 초음파 속도를 자동적으로 측정할 수 있는 모니터링 시스템을 이용하여 물-결합재 비(W/B) 가 $0.27{\sim}0.50$인 모르타르와 콘크리트의 초음파 속도를 배합 직후부터 24시간까지 측정하였다. 또한, 용결 시간과 압축강도를 측정하기 위해 관입 저항 시험과 압축강도 시험을 각각 수행하였다. 실험결과로부터, 보통강도 콘크리트 배합의 초음파 속도는 배합 후 수 시간 동안에는 일정하다가 이후부터 갑자기 증가하는 경향을 보인 반면에, 고강도 콘크리트 배합에서는 고성능 감수제의 사용에 따른 응결 지연으로 초음파 속도가 서서히 증가하는 경향을 보였다. 그리고, 콘크리트의 응결은 초음파 속도가 소정의 속도에 도달했을 때 발생하는 것으로 나타냈다. 또한, 초음파 속도로부터 재령 3일 이하의 초기 강도 추정식에 W/B의 영향을 고려하면 보다 정확한 예측이 가능하리라 판단된다.