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A Study on Usage Frequency of Translated English Phrase Using Google Crawling
( Kyuseok Kim ),( Hyunno Lee ),( Jisoo Lim ),( Sungmin Lee ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
People have studied English using online English dictionaries when they looked for the meaning of English words or the example sentences. These days, as the AI technologies such as machine learning have been developing, documents can be translated in real time with Kakao, Papago, Google translators and so on. But, there has still been some problems with the accuracy of translation. The AI secretaries can be used for real-time interpreting, so this kind of systems are being used to translate such the web pages, papers into Korean. In this paper, we researched on the usage frequency of the combined English phrases from dictionaries by analyzing the number of the searched results on Google. With the result of this paper, we expect to help the people to use more English fluently.
Kyuseok Kim,Youngjin Lee Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
Scintillator materials are widely used in the medical and industrial fields for imaging systems using gamma cameras. In this study, image evaluation is performed by modeling a gamma camera system based on a lutetium-yttrium oxyorthosilicate (LYSO) scintillation detector using a pinhole collimator that can improve the spatial resolution. A LYSO detector-based gamma camera system is modeled using a Monte Carlo simulation tool. The geometric concept of the pinhole collimator is designed using various magnification factors, and the spatial resolution is measured using the acquired source image. To evaluate the resolution, the full width at half maximum (FWHM) and natural image quality assessment (NIQE), a no-reference-based parameter, are used. We confirm that the FWHM and NIQE values decrease simultaneously when the diameter of the pinhole collimator increases. Additionally, we confirm that the spatial resolution improves as the magnification factor increases under the same pinhole diameter condition. Particularly, a 0.57 mm FWHM value is obtained using the modeled gamma camera system with a LYSO scintillation detector. In conclusion, our results demonstrate that a pinhole collimator with a LYSO scintillation detector is a promising gamma camera imaging system.
Recent Developments in Nuclear Forensic and Nuclear Safeguards Analysis Using Mass Spectrometry
( Kyuseok Song ),( Jong-ho Park ),( Chi-gyu Lee ),( Sun-ho Han ) 한국질량분석학회 2016 Mass spectrometry letters Vol.7 No.2
The analysis of nuclear materials and environmental samples is an important issue in nuclear safeguards and nuclear forensics. An analysis technique for safeguard samples has been developed for the detection of undeclared nuclear activities and verification of declared nuclear activities, while nuclear forensics has been developed to trace the origins and intended use of illicitly trafficked nuclear or radioactive materials. In these two analytical techniques, mass spectrometry has played an important role in determining the isotope ratio of various nuclides, contents of trace elements, and production dates. These two techniques typically use similar analytical instruments, but the analytical procedure and the interpretation of analytical results differ depending on the analytical purpose. The isotopic ratio of the samples is considered the most important result in an environmental sample analysis, while age dating and impurity analysis may also be important for nuclear forensics. In this review, important aspects of these techniques are compared and the role of mass spectrometry, along with recent progress in related technologies, are discussed.
Kyuseok Song,Euo Chang Jung,Hyungki Cha,Jeongsik Moon,Sang Chun Lee 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
The characteristic behaviors of the post-ionized signals of neutral atoms generated by either ion beam sputtering or laser ablation were investigated by adopting a Pb plate as a target sample. The signal intensities and the threshold laser power for ion generation were compared for various the ion generation schemes, such as laser ablation with 532 nm laser only (Case I), 2-color resonant laser ablation by using 532 nm and 283.3 nm lasers (Case II), laser ablation with 532 nm laser followed by resonant post-ionization with 283.3 nm laser (case III), and 2-color resonant laser ablation followed by resonant post-ionization (case IV). Case I required the highest threshold laser power required for ion generation while Case III with a 500 ns delay between the two laser pulses, 532nm and 283.3 nm, required the least laser power for the generation of ion signals. A comparison of the ion signal intensities between case II and case IV revealed a variation in the signal intensity that depended on the time delay between the ablation laser pulse and the ionization laser pulse. Meanwhile, the post-ionization of the neutrals generated by ion beam sputtering (case V) showed a comparable ion signal to that of the post-ionization signal of the laser-induced plasma. The resonant post-ionization of the sputtered neutrals showed a more than 10 times signal enhancement with the use of a 100 times less laser power, 0.6 mW, when compared to the case of non-resonant laser ionization with 60 mW at 355 nm. The behavior of the ion signal of the sputtered neutrals was also investigated by varying the experimental parameters, such as the time delay between the ion beam pulse and the laser pulse, the ion beam pulse and the high voltage pulse for ion extraction, and the high voltage applied to the ion extraction.