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Integrated Nano-Heater Induced Switching Characteristics of Superconducting Nanobridges
이승백 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
The switching characteristics of a superconducting nanobridge due to the actions of an integrated nano-heater are reported. The voltage applied to the nano-heater (200 nm wide, 400 nm long) generates nonequilibrium `hot' phonons which are injected into the superconducting nanobridge (140 nm wide, 460 nm long) located 20 nm below the nano-heater. Hot phonons with energies higher than twice the local superconducting energy gap scatter with the Cooper pairs creating quasiparticles. This reduces the critical current and enables the superconducting nanobridge to switch to the voltage state at a lower bias current. The results show that through this mechanism, the nanobridge can switch at much lower currents (12 A) than predicted by Joule heating (87 A). Also, the device acts as a nanotransistor with a voltage gain of 5, making it possible to apply the device as a low-temperature amplifler.
이승백,오순남,최문형,나성은,정승은,변재영 대한자기공명의과학회 2017 Investigative Magnetic Resonance Imaging Vol.21 No.3
Purpose: To evaluate the imaging findings of desmoid tumors using various imaging modalities and to evaluate whether diffusion-weighted imaging (DWI) can help differentiate between desmoid and malignant tumors. Materials and Methods: The study included 27 patients with pathologically confirmed desmoid tumors. Two radiologists reviewed 23 computed tomography (CT), 12 magnetic resonance imaging (MRI) and 8 positron emission tomographycomputed tomography (PET-CT) scans of desmoid tumors and recorded data regarding the shape, multiplicity, size, location, degree of enhancement, and presence or absence of calcification or hemorrhage. The signal intensity of masses on T1- and T2-weighted imaging and the presence or absence of whirling or band-like low signal intensity on T2-weighted imaging were recorded. The apparent diffusion coefficient (ADC) values of the desmoid tumors in nine patients with DWIs were compared with the ADC values of 32 malignant tumors. The maximum standardized uptake value (SUVmax) on PET-CT images was measured in 8 patients who underwent a PET-CT. Results: The mean size of the 27 tumors was 6.77 cm (range, 2.5-26 cm) and four tumors exhibited multiplicity. The desmoid tumors were classified by shape as either mass forming (n = 18), infiltrative (n = 4), or combined (n = 5). The location of the tumors was either intra-abdominal (n = 15), within the abdominal wall (n = 8) or extra-abdominal (n = 4). Among the 27 tumors, 21 showed moderate to marked enhancement and 22 showed homogeneous enhancement. Two tumors showed calcifications and one displayed hemorrhage. Eleven of the 12 MR T2-weighted images showed whirling or band-like low signal intensity areas in the mass. The mean ADC value of the desmoid tumors (1493 × 10-6 mm2/s) was significantly higher than the mean of the malignant soft tissue tumors (873 × 10-6 mm2/s, P < 0.001). On the PET-CT images, all tumors exhibited an intermediate SUVmax (mean, 3.7; range, 2.3-4.5). Conclusion: Desmoids tumors showed homogenous, moderate to marked enhancement on CT and MRI scans and a characteristic whirling or band-like pattern on T2-weighted images. DWI can be useful for the differentiation of desmoid tumors from malignant soft tissue tumors
이승백,임채현,Won-il Choi,Eun-Suk Choi,Kangwon Choi,Sunggu Ahn,Junhyuk Lee,Sung-Jin Choi,박봉현 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
We report on the toxic-gas-sensing characteristics of density-controlled carbon-nanotube-network (NTN) thin-film devices prepared on exible poly-dimethylsiloxane (PDMS) substrates. The devices were prepared by directly curing PDMS on selective vacuum-filtered NTN surfaces. The roomtemperature NH3 gas-sensing characteristics showed that for a 9-mm-channel-length device, a 40-s exposure to 10-ppm NH3 resulted in a 17 % decrease in conductance. Comparing devices with uniform square resistances and differing channel lengths showed that while having the same surface reaction rate (4.17 × 10-6 ppb-1·s-1) to NH3, the longer NTN showed a higher sensor response. This was attributed to the increased semiconducting behavior of the longer NTN channels. We also found that the sensitivity may be improved further by reducing the nanotube density, which reduces the probability of forming metallic nanotube paths between the contacts.
백소진・정용식・권이승 가톨릭관동대학교 대원환경연구소 2016 보건환경연구논문집 Vol.21 No.-
ABSTRACT : This study aims to investigate the harmfulness of printing with phthalates and formaldehyde components of pristine preparations, which are commonly regulated by the international harmful substances regulation. The materials used in the experiment were 10 kinds of Prastisol. In order to understand what kind of changes in the prastisol of 10 experimental specimens were caused by thermal reaction, the fabric was printed and heat was applied. The phytogenic plasticizer was able to reduce phthalates of plastisol, and the effect of bio substitution of formaldehyde was determined. In other words, it was concluded that Prastisol, which is a vegetable based plasticizer, can function competitively in terms of functionality, environmentally friendly, and restricted substances of international harmful substances and global sports apparel brands