Monolayer MoS₂ is energetically most stable when it has a 1H phase, but 1H to 1T phase transition (1H→1T) is easily realized by various ways. Even though magnetic moment is not observed during 1H→1T, 0.049 μ_B/MoS₂ is obtained in local 1T phase; 75% 2H and 25% 1T phases are mixed in (2 × 2) supercell. Most magnetic moment is originated from the 1T phase Mo atom in the supercell, while the magnetic moments of other atoms are negligible. As a result, magnetic/non-magnetic boundary is created in the monolayered MoS₂. Our result suggests that MoS₂ can be applied for spintronics such as a spin transistor.

CoSiB is the amorphous ferromagnetic material and multilayer consisting of CoSiB and Pd has perpendicular magnetic anisotropic property. PMA has strong advantages for STT-MRAM. Moreover, amorphous materials have two advantages more than crystalline materials: no grain boundary and good thermal stability. Therefore, we studied the magnetic properties of multilayers consisting of the Co₇₅Si₁₅B₁₀ with PMA. In this study, we investigated the magnetic property of the [CoSiB (3, 4, 5, and 6) Å/Pd (11, 13, 15, 17, 19, and 24 Å)]₅ multilayers and found the annealing temperature dependence of the magnetic property. The annealing temperature range is from room temperature to 500 ℃. The coercivity and the saturation magnetization of the CoSiB/Pd multilayer system have a close association with the annealing temperature. Moreover, the coercivity especially shows a sudden increasing at the specific annealing temperature.

This paper introduces a performance integration method to predict variation characteristic of a performance function of electromagnetic machines or devices due to manufacturing tolerances. A normalized performance function space and a hybrid mean value technique are adapted to effectively predict mean and variance, which can identify probabilistic distribution of the performance function. To verify the effectiveness and accuracy of the proposed method, a mathematical problem and a loudspeaker model are tested, and numerical results are compared with those of existing methods such as Monte Carlo simulation and univariate dimension reduction method.

BLDC 전동기의 코깅토크는 영구자석과 철심의 상호작용에 의해 발생하고 소음과 진동을 발생시키는 요인이다. 제조 과정에서 조립 공차로 인해 영구자석이 회전자 철심 면에 제대로 붙지 않을 경우 BLDC 전동기의 전자기적 구조가 변할 수 있다. 본 논문에서는 조립 공차로 인해 자석이 회전자 표면과 분리되었을 때 코깅토크에 미치는 영향에 대해 연구했다. 핵심적인 설계 요소들인 회전자와 자석 간 분리, 분리를 가진 자석 수, 이웃한 자석들 간의 여러 배치형태를 고려했다. 코깅토크 해석을 위해 유한 요소법을 사용하였고, 소음진동을 발생시키지 않는 조립 공차를 제안했다. 제안된 조립 공차로 제작된 BLDC 전동기의 코깅토크는 감소되었고 소음진동 또한 줄어들 것이라고 판단된다.

To aim of this study was to assess the full scan and half scan of imaging with half scan factor. Patients without a cerebral vascular disease (n = 30) and were subject to the full scan half scan, and set a region of interest in the cerebral artery from the three regions (C1, C2, C3) in the range of 7 to 8 mm. MIP (maximum intensity projection) to reconstruct the images in signal strength SNR (signal to noise ration), PSNR (peak signal noise to ratio), RMSE (root mean square error), MAE (mean absolute error) and calculated by paired t-test for use by statistics were analyzed. Scan time was half scan (4 minutes 53 seconds), the full scan (6 minutes 04 seconds). The mean measurement range (7.21 mm) of all the ROI in the brain blood vessel, was the SNR of the first C1 is completely scanned (58.66 dB), half-scan (62.10 dB), a positive correlation (r²= 0.503), for the second C2 SNR is completely scanned (70.30 dB), halfscan (74.67 dB) the amount of correlation (r² = 0.575), third C3 of a complete scan SNR (70.33 dB), half scan SNR (74.64 dB) in the amount of correlation between the It was analyzed with (r² = 0.523). Comparative full scan with half of SNR (4.75 ± 0.26 dB), PSNR (21.87 ± 0.28 dB), RMSE (48.88 ± 1.61), was calculated as MAE (25.56 ± 2.2). SNR is also applied to examine the half-scans are not many differences in the quality of the two scan methods were not statistically significant in the scan (p-value > .05) image takes less time than a full scan was used.

항암요법과 방사선치료를 병행하여 두경부암을 치료하는 환자의 경우 항암요법과 방사선치료를 거듭할수록 구토, 메스꺼움, 식욕부진 등의 이유로 환자의 체중 감소가 생기게 된다. 체중 감소는 목의 두께 변화로 나타날 수 있으며 이로 인해 치료하고자 하는 t 타겟과 주위 정상조직의 선량 전달에도 영향을 미치며 방사선이 전달되는 방향에 위치한 피부선량의 변화가 나타날 것으로 사료된다. 특히 비인두암 환자의 경우 비인두 구조가 다른 장기보다 복잡한 구조를 지니고 있고 치료방법인 토모테라피는 수 mm 차이로 급격한 선량 변화가 발생하므로 이러한 체중 감소의 변화에 주의 깊은 관찰이 필요하다. 현재 토모테라피의 경우 매 회치료 전 정확한 자세 재현을 위한 영상 검증을 통해 이러한 움직임을 확인하고 그 값을 보정하여 치료를 수행한다. 그러나 환자의 체중 감소로 인하여 피부선량에 전달되는 선량 변화의 검증은 되지 않고 있다. 환자의 피부선량이 증가함으로써 나타나는 부작용은 환자의 삶의 질에 영향을 미칠 뿐 만 아니라 2차 암 발생률을 높일 수 있다. 이에 환자의 체중 감소로 인하여 나타나는 환자의 목 두께를 휴먼 팬톰에 볼루스를 올리고 두께를 조절해가며 변화시켜 필름을 이용하여 피부선량의 변화가 어떻게 나타나는지 분석해보고자 한다.

In this study, For assessment of triangular fibrocartilage complex (TFCC) injury, we acquired images by fat suppressed 3D fast spoiled gradient recalled T1 and fat suppressed Isotropic 3D fast spin echo T1 techniques. For quantitative evaluation, measured signal to noise ratio and contrast to noise ratio and verified statistical significance between two imaging techniques by Mann-Whitney U verification. And for qualitative evaluation, marked 4-grade scoring (0: non diagnostic, 1: poor, 2: adequate, 3: good) on shape of TFCC, artifacts by partial volumes, description of the lesions by two radiologist, verified coincidence between 2 observer using Kappa-value verification. We used 3.0 Tesla MR equipment and 8-channel RF coil for imaging acquisition. As quantitative evaluation results, signal to noise ratio and contrast to noise ratio value of Isotropic 3D fast spin echo T1 technique is higher in every image sections, also between two imaging techniques by Mann-Whitney U verification was statistically significant (p < 0.05). As qualitative results, observer 1, 2 marked a higher grade on Isotropic 3D FSE T1 technique, coincidence verification of evaluation results between two observers by Kappa-value verification was statistically significant (p < 0.05). As a result, during MRI examination on TFCC injury, fat suppressed Isotropic 3D fast spin echo T1 technique is considered offering more useful information about abnormal lesion of TFCC.