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Seyong Chang(張世鏞) 대한자원환경지질학회 1976 자원환경지질 Vol.9 No.1
It is believed that geological survey, drilling and geophysical survey which was carried out on Tertiary deposits in Pohang is a valuable but through the studying of many Tertiary sediments in Japan discovered many questions on analysis of final report prepared by National geological survey. The main reason is: 1. The seismic sound velocity which have regulated in the final report prepared by geological survey for Tertiary deposits in Pohang was 1,500-2,000m/sec in spite of oil bearing sediments of same age in Japan are 2,000-3,800m/sec. These may means the requirement of reconsideration of seismic velocity for Tertiary deposits in Pohang and required to have a dipper drilling. 2. Stratigraphically, geophysically, and paleontologically, the Tertiary deposits in Pahang land area is similar with that of Nishiyama-Hunakawa formations of Akita oil field in Japan. Nishiyama- Hunakawa formation is the main oil bearing formation in Japan. 3. Those valcanic rock including andestitic rock and liparitic rock which have extensively distributed over either at land area or at sea bottom, assumed by geological survey as the base of Tertiary sediments. But in case of Japan many oil bearing deposits are in over laid by these kind of volcanic rock. Therefore a possible of same condition with Japan is presumable on Tertiary sediments in Pohang. 4. It is believed that the Tertiary sediments of land area in Pohang is the extension of offshore basin but is wandering that the final report submitted by geologic survey have not remain any word on report of ECAFE discribed so much problematics as followed: A. Although it was assumed that no great thickness exceeding 1,000 meters, or major structures would be encountered in the Tertiary offshore sequence, it was hoped that shallow hydrocarbon deposits might be found, because these sediment are lithologically similar to those of the same age in the producing area of the northwest Honshu region of Japan where hydrocarbon are extracted from depths of only 500 to 600 meters. B. Four possible hydrocarbon trap conditions are represented in the survey area: anticlinal folds, faults, pinch outs, along the igneous basement and lateral facies changes. C. Mot of the prime possible reservoir area are beyond the 50 meter water depth mark, except for the structures in Yonil Bay. D. Despite the shallowness of the offshore basin, sufficient trap condition exist in the area to warrant further exploration for hydrocarbon. 5. All of the problems mentioned above have gave us a strong reasons to have us hesitating to make a final conclusion on Tertiary problems in Pohang, before to have a drill to a depth to 3,000 meters or more whatever it is the Tertiary or a Mesozoics below 1,000 meters.
The AC Loss Estimation of Bi-2223/Ag Superconductor Tapes in Polygonal Configuration
Seyong Choi,Wansoo Nah IEEE 2010 IEEE transactions on applied superconductivity Vol.20 No.3
<P>In this paper, we have studied the electromagnetic phenomenon and AC losses of assembled high-T<SUB>c</SUB> superconductor (HTS) tapes using the finite element method (FEM) approach. The model cable is composed of several Bi-2223/Ag tapes with polygonal shape on the cylindrical former that was arranged in parallel along the conductor axis. The HTS tape usually shows complex material properties, which are described by the nonlinear resistivity and the anisotropy against the external magnetic flux density as well as its angle. The numerical calculation was carried out considering the field dependence of critical current density and index value, which accounts for the anisotropy of the Bi-2223/Ag tape. The calculated AC losses were compared with the experimental results and with the theoretical values. It was observed that the analytic formulae are not proper to predict the AC loss of the multi-stranded conductor that is presented here. The adjacent tape's effect of the conductor on the AC loss was also investigated and discussed.</P>
Seyong Jung,Jisung Lee,Byungjun Park,Sangkwon Jeong,Junseok Ko,Jeonghyun Lee,Younghee Han,Jeongphil Lee,Byungchul Park,Hyerim Kim,Taehyun Sung IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>This paper presents an idea for a thermosiphon that uniquely implements two integrated evaporators to cool two HTS (High Temperature Superconductor) bulk sets in different locations, simultaneously. A so-called double-evaporator thermosiphon was designed, fabricated and tested using nitrogen as the working fluid under sub-atmospheric pressure conditions. The operating target temperature was approximately 65 K. To confirm the feasibility of the double-evaporator thermosiphon, experiments during the cool down process and steady state operation were extensively conducted on the double-evaporator thermosiphon (L<SUB>tot</SUB> = 1075 mm, d<SUB>o</SUB> = 160 mm). The double-evaporator thermosiphon worked successfully at steady state operation. The results showed that it had a maximum total temperature difference between the condenser and the evaporator of 1.3 K and a temperature difference between the two evaporators of 0.6 K at a heat flow of 87 W. This thermosiphon was designed for actual application to a 100 kWh SFES (Superconducting Flywheel Energy Storage) system. The potential impact of superior heat transfer characteristics of the double-evaporator thermosiphon is discussed in the paper.</P>
Seyong Choi,Jang-Hee Yoon,Mi-Sook Won,Byoung-Seob Lee,Jung-Woo Ok,Byoung Chul Kim,Jin Yong Park,Jung Ho Kim,Shi Xue Dou,Se-Hee Lee,Kiyoshi, T. Institute of Electrical and Electronics Engineers 2012 IEEE transactions on applied superconductivity Vol.22 No.3
<P>We propose two methods to predict the AC transport current losses of MgB<SUB>2</SUB> superconducting wires with respect to various operating currents (I<SUB>tr</SUB>) and temperatures (T). Firstly, the transport current loss was estimated by a numerical method (finite element analysis). In order to consider the highly nonlinear behavior of the superconducting properties according to magnetic flux density (B) at each temperature, the measured J<SUB>c</SUB> - B - T characteristics were used in the calculation. The numerical results were compared with these of conventional Norris theory and showed quite good coincidence. A second method to predict the transport current loss at various temperatures, which used a loss at a specific temperature and the critical current data, is suggested. We deduce a formula for the prediction of the loss by a simple analogy through normalization, which performs excellently. The comparison of the transport current loss values calculated using the two methods is addressed.</P>
Seyong Park,Young Soo Yoon 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.5
In this paper, we report the first successful fabrication of CdWO4 thin film scintillators deposited on quartz glass substrates by using an electron-beam physical vapor deposition method. The films were dense, uniform, and crack-free. CdWO4 thin-film samples of varying thicknesses were investigated by using structural and optical characterization techniques. An optimized thickness for the CdWO4 thin-film scintillators was discovered. The scintillation and the optical properties were found to depend strongly on the annealing process. The annealing process resulted in thin films with a distinct crystal structure and with improved transparency and scintillation properties. For potential applications in gamma-ray energy storage systems, photoluminescence measurements were performed using gamma rays at a dose rate of 10 kGy h−1.
Increasing Interactivity of Paper Prototyping with Smart Pen
Seyong Ha,Jiwan Park,Joonhwan Lee 한국HCI학회 2014 한국HCI학회 학술대회 Vol.2014 No.12
Wireframes have been widely used in the early phase of user interface (UI) design processes. However, because they lack interactivity in usage, it is not possible for users to have a realistic experience. Through our preliminary study, several implications were found for developing a wireframe prototyping system. Based on these, we designed a prototyping tool for ad hoc mobile prototyping, which allows designers to build an interactive prototyping system quickly. The system supports designer’s natural drawing behaviors and builds an interactive prototype based on their sketches. From users’ feedback, we found our tool was useful for building interactive low-fidelity prototypes.
Seyong Choi,Wooseok Lee,Jihyun Yun,Jeongseok Seo,Inja Lim 대한생리학회-대한약리학회 2008 The Korean Journal of Physiology & Pharmacology Vol.12 No.2
Cardiac fibroblasts constitute one of the largest cell populations in the heart, and contribute to structural, biochemical, mechanical and electrical properties of the myocardium. Nonetheless, their cardiac functions, especially electrophysiological properties, have often been disregarded in studies. Ca<sup>2+</sup>-activated K<sup>+</sup> (K<sub>Ca</sub>) channels can control Ca<sup>2+</sup> influx as well as a number of Ca<sup>2+</sup>-dependent physiological processes. We, therefore, attempted to identify and characterize K<sub>Ca</sub> channels in rat Cardiac fibroblasts. First, we showed that the cells cultured from the rat ventricle were cardiac fibroblasts by immunostaining for discoidin domain receptor 2 (DDR-2), a specific fibroblast marker. Secondly, we detected the expression of various K<sub>Ca</sub> channels by reverse transcription polymerase chain reaction (RT-PCR), and found all three family members of K<sub>Ca</sub> channels, including large conductance K<sub>Ca</sub> (BK-Ձ1- and -Ղ1∼4 subunits), intermediate conductance K<sub>Ca</sub> (IK), and small conductance K<sub>Ca</sub> (SK1∼4 subunits) channels. Thirdly, we recorded BK, IK, and SK channels by whole cell mode patch clamp technique using their specific blockers. Finally, we performed cell proliferation assay to evaluate the effects of the channels on cell proliferation, and found that the inhibition of IK channel increased the cell proliferation. These results showed the existence of BK, IK, and SK channels in rat ventricular fibroblasts and involvement of IK channel in cell proliferation.