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Diluted Ferromagnetic Semiconductor in a Cr-Based MnTe Thin Film
김삼진,김철성,Jungbum Yoon,Kwang Joo Kim,정명화,Sung Hwan Bae,김우철 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.2
Mn1-xCrxTe (x = 0.05, 0.1, 0.15), a single phase of high crystalline quality, was successfully grown on a Si(100):B substrate by using molecular beam epitaxy (MBE). An investigation on the magnetic and the electric transport properties of the Mn1-xCrxTe (x = 0.05, 0.1, 0.15) films shows ferromagnetic properties unlike antiferromagnetic bulk MnTe materials. The temperature dependence of the magnetic susceptibility in the film with x = 0.10 exhibits a sharp ferromagnetic transitions at around 175 K. An obvious semiconducting behavior is shown in the temperature range from 20 K up to 300 K. Our X-ray results and magnetization data have verified the ferromagnetism for preparing Cr-cluster-free magnetic semiconductor thin films as candidate materials for potential spintronic applications.
Total quilting suture at latissimus dorsi muscle donor site: Drain tube is no longer needed
Younjung Cha,Seokwon Lee,Youngtae Bae,Younglae Jung,Jungbum Choi 대한종양외과학회 2019 Korean Journal of Clinical Oncology Vol.15 No.2
Purpose: The purpose of this study was to assess the effect of quilting suture extent on the latissimus dorsi myocutaneous flap (LDMCF) donor site and the necessity of drainage. Methods: Clinical data of 136 breast cancer patients, who underwent breast reconstruction using LDMCF between May 2014 and December 2015, were retrospectively reviewed. Patients were divided into three groups. Group A: quilting sutures were performed on half of the LDMCF donor site and a closed suction drain was inserted. Group B: quilting sutures were performed for the entire LDMCF donor site and a closed suction drain was inserted. Group C: quilting sutures were performed for the entire LDMCF donor site and no drain was inserted. The duration of drainage, total drainage, length of hospital stay, number of postoperative aspirations for seroma removal, and total aspirated volume were compared. Results: In the comparison of groups A and B, group B showed better results including the total amount of drained seroma, drain maintenance period, number of aspirations for seroma removal after drainage tube removal, total aspirated seroma, and hospitalization period with statistical significance (P<0.05). In the comparison of groups B and C, group C without drain showed no difference in all other variables except mean total drained seroma volume. Therefore, group C was superior to group A and there was no difference compared to group B with drain, even though the drain was not inserted. Conclusion: Total quilting suture at LDMCF donor site can reduce seroma formation and eliminate the need for a drain tube.
Min Chul Cho,Chang Ahn,Ji Hyeon Roh,Jungbum Bae,Jong Sun Choi,Eo-Jin Kim,Hae Won Lee,Kwang Soo Lee 대한비뇨기종양학회 2013 대한비뇨기종양학회지 Vol.11 No.2
Chromophobe renal cell carcinoma (ChRCC) is a distinct histologic subtype of RCC and accounts for approximately 5% to 10%. The prognosis for ChRCC is considered to be better than those for other types of RCC. Sarcomatoid transformation occasionally occurs and has been presented as a predicting factor of poor prognosis. However, there has been a scarcity of reports on aggressive type of ChRCC without sarcomatoid change. Here we report an unusual case of aggressive variant of ChRCC with hilar lymph node metastasis, with tumor necrosis and without sarcomatoid change. In addition, this case was accompanied by synchronous occurrence of tonsillar squamous cell carcinoma.