We analyzed MnIr thickness dependence of exchange bias fields (H_ex) and rotatable anisotropy fields (H_ra) by the ferromagnetic resonance method in 300 ℃ annealed CoFe/MnIr(t_AF) bilayers. The critical thickness of MnIr was t_c = 3.0 nm, the H_ex as well as H_ra was appeared at t_AF > t_c. It was due to the grain size distribution of the MnIr. The H_ex was induced by fixed AF spins of MnIr grains thicker than t_c, while H_ra was induced by rotatable AF spins of MnIr grains thinner than t_c. The exchange coupling field H_ec = H_ra + H_ex did not depend on the MnIr thickness at t_AF > t_c, therefore, we concluded that the exchange coupling energy did not depend on the MnIr thickness at t_AF > t_c.

We analyzed the magnetic field dependence of V_SF signal, which second harmonic signal was generated by self-field of planner Hall resistance (PHR) sensor. The V_SF signal was proportional to the product of sensitivity of PHR sensor and self-field. The magnetic field dependence of bead signal detected by V_SF signal showed maximum value at H = 0. The bead signal detected by using the Self-field sensor operated at H = 0 showed linear behavior up to 1/100 bead concentration. Thus, the Self-field sensor can be applied to the external field free biosensor.

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.

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.

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.

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.