Journal of the Korean Magneitcs Society, 31 Oct 2019, Vol.29 , No.5, pp.161-165
CoFe/MnIr 박막에서 MnIr 두께에 따른 교환 결합 특성 분석
We analyzed MnIr thickness dependence of exchange bias fields (
Journal of the Korean Magneitcs Society, 31 Oct 2019, Vol.29 , No.5, pp.166-170
PHR 센서의 자체 자기장을 이용한 자성 비드 신호 탐지
We analyzed the magnetic field dependence of
Journal of the Korean Magneitcs Society, 31 Oct 2019, Vol.29 , No.5, pp.171-176
자기장크기 측정이 가능한 3-축 Flux-gate 마그네토미터 제작
Magnetic field measurement under vibration and rotation condition of the magnetometer, total field measuring magnetometers have been used, because orthogonality error and scale factor differene of the 3-axis magnetometer can not measure total magnetic field with high precission. In this study, we developed total magnetic field sensor by orthogonality correction for the 3-axis flux-gate magnetometer. To correct orthogonality and scale factor, 24 bit 3-channel simultaneous digitizing ADC and DSP were used. To demonstrate the performance of the developed magnetometer under condition of vibration, the magnetometer was installed on dron and measured magnetic anormality of passenger cars. We can measure total magnetic field with resolution of 1 nT for the developed orthogonality corrected 3-axis flux-gate magnetometer.
Journal of the Korean Magneitcs Society, 31 Oct 2019, Vol.29 , No.5, pp.177-183
저주파 전기자극에 따른 혈압 특성과 홀효과센서를 이용한 맥진파형 특성에 관한 연구
The characteristics of the measured 80 data during 7 months for the systolic blood pressure (SBP), diastolic blood pressure (DBP), heart rate (HR), and the systolic time (S.time) were investigated according to the conditions of the low frequency acupuncture electrical stimulator(AES). The S.time of the radial artery pulse wave was measured by a clip-type pulsimter equipped with a permanent magnet and a Hall effect sensor. The mean SBP, DBP, and HR decreased by 5.7 mmHg, 2.1 mmHg and 1.4 /min at 124.1 mmHg, 66.4 mmHg and 87 /min, respectively, after the low frequency treatment by AES. The S.time was 108.6 ms having an increase of 2.6 ms after electrical stimulation at 30 Hz rather than 8 Hz and 15 Hz. The low frequency electrical stimulation was found to effectively stabilize the blood pressure and increase the blood flow in the human body.
Journal of the Korean Magneitcs Society, 31 Oct 2019, Vol.29 , No.5, pp.184-195
핵의학(Nuclear Medicine) 소개 PET/MRI
Nuclear medicine is a field of medicine that uses radioactive materials for diagnosis and therapy of human diseases. Radionuclide is combined with medicines to form chemicals. It also forms radiopharmaceuticals in combination with pharmaceutical compounds. Radiopharmaceuticals refer to unsealed radioactive isotopes, compounds and preparations used for diagnosis or therapy. A great advantage of nuclear medicine is the imaging of morphological changes in human diseases. Unlike conventional diagnostic exam, the extent of disease processes in the human body can be imaged based on the cellular function and physiology of the tissue. Nuclear medicine is used for prognostic determination and therapy planning after diagnosis and therapy of disease. The nuclear medicine exam differs from the radiological imaging exam. The main difference is that the radiation sources used for imaging are gamma-rays and beta-rays. According to the generated physical principle, it is divided into single photon emission image and positron emission image. The purpose of this article is to discuss the introduction of nuclear medical imaging systems and PET/MRI (positron emission tomography/magnetic resonance imaging) and future development directions.
Journal of the Korean Magneitcs Society, 31 Oct 2019, Vol.29 , No.5, pp.196-207
방사선치료의 최근 기술 동향
The electromagnetic radiation therapy is a typical treatment method for treating human body cancer. During the past 100 years, there has been a rapid change in the progress of medical technology, and there have been many developments in the last ten years. Computed tomography was introduced for radiation therapy, and Three-dimensional conformal radiation therapy was started through image reconstruction techniques. Through intensity-modulated radiation therapy which examines the radiation intensity from the same plane in another way, more complex and detailed treatment became possible. In addition, accurate treatment became possible via image-guided radiation therapy which increases the reproducibility of the patient's position by using images acquired with the treatment equipment. Recently, with the advent of new equipment through the fusion of magnetic resonance imaging equipment and therapy equipment, it will give much help to radiation therapy. Such changes are expected to have many developments in the field of radiation therapy in the future.