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Sukjin Kim,Jong-Seo Choi,Shingu Kang,Jeong-Hwa Park,Sunha Hong,Tae-su Kim,Woonho Yang 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.6
No-tillage is an effective practice to save labor input and reduce methane emission from the paddy. Effects of tillage and cultivation methods on carbon accumulation and soil properties were investigated in the treatments of tillage-transplanting (T-T), tillage-wet hill seeding (T-WS), minimum tillage-dry seeding (MT-S) and no-tillage dry seeding (NT-S) of rice. Soil carbon was higher in NT-S and MT-S, compared to T-T and T-WS. In NT-S and MT-S, soil carbon contents were the highest in the top soil (5 cm depth) and decreased with soil depth. In T-T and T-WS, however soil carbon contents showed no significant difference up to soil depth of 15 cm from the top. Carbon content was the highest in the soil particle size under 106 μm and decreased as the soil particle size increased. Contents of water-stable aggregates in NT-S and MT-S were higher than those of T-T and T-WS. In NT-S and MT-S, contents of water-stable aggregates were the highest in the top soil and significantly decreased with soil depth while no significant difference up to the soil depth of 15 cm in T-T and T-WS. Available SiO2 contents in the top soil were the highest in NT-S and MT-S while the lowest in T-T and T-WS. It is concluded that minimum or no disturbance of soil in rice cultivation can increase carbon accumulation in the soil, especially in the top layer, and subsequently contribute to the formation of the water-stable soil aggregates.
The Manufacture and Test of a GdBCO Insert Coil for an 11 T Superconducting Magnet
Sukjin Choi,Hyun Chul Jo,Young Jin Hwang,Jae Young Jang,Jin Bae Na,Tae Kuk Ko IEEE 2013 IEEE transactions on applied superconductivity Vol.23 No.3
<P>In this paper, an 11 T hybrid (LTS/HTS) magnet was designed and developed. The LTS background magnet generates 9 T and the HTS insert coil generates 2 T. The inner diameter of the HTS coil is 40 mm. The outer diameter of the LTS magnet is 176 mm. The height of the inner HTS magnet and the outer LTS magnet are 100 and 200 mm, respectively. The LTS magnet and the HTS coil were fabricated using NbTi wire and GdBCO tape, respectively. The LTS background magnet was fabricated without mandrel, thus reducing shear stress, and using a pre-preg material between each layer. Pre-preg is a thin, glass-woven fabric impregnated with a resin. The electromagnetic field analysis presented here was performed with respect to the structure and the operating current of both the LTS magnet and HTS coil. The hybrid (LTS/HTS) magnet was operated at liquid helium temperature 4.2 K. After several quench, the maximum magnetic field of the center was 10.51 T.</P>
Syntactic analysis on Information Structure
Sukjin Kim 한국언어과학회 2020 한국언어과학회 학술대회 Vol.2020 No.10
This paper is to map information structure into syntax structure by analysing Korean cleft sentences namely, 'Kesun' and 'Kinun' cleft sentence. The derivation of Korean cleft sentences is analyzed with two main ways, base generation and movement analysis. This paper insists that first, ‘Kesun’ cleft is the division by Topic and Identificational Focus and ‘Kinun’ cleft is the division by Contrastive Topic and Informational Focus. Second, basic syntactic function of the two cleft sentences in Korean is movement. and to support this movement, several functional categories are inserted, namely, a nominalizer ‘-n kes’ and ‘ki’, and Functional verb ‘-ida’. And the last, a basic tree diagram for Korean language is like the following. This tree diagram above shows that on the ground that ‘–n kes’ can accommodate tense and auxiliaries, Topic Phrase is located above ModP and because ‘-ki’ can accommodate Aspect and Root Verb, Contrastive Topic Phrase is located above AspP and under TP. Information structure believed to be located above syntactic structure can be clearly shown with this diagram and this can be applied to analyze not only cleft sentence but also information structrure related phenomena in korean language and even more to, hopefully, Indo-Eropean cleft setences.
Sukjin Choi,Joon-Han Bae,Myung-Hwan Sohn,Chan Park,Ji-Kwang Lee,Kyeongdal Choi,Tae Kuk Ko IEEE 2011 IEEE transactions on applied superconductivity Vol.21 No.3
<P>A superconducting property measurement system (SPMS) is used to acquire electrical and thermal properties of short HTS tape samples. The SPMS is composed of a specimen holder for mounting an HTS tape and magnet for applying a magnetic field externally. The magnet consists of two split racetrack windings and is designed to produce maximum 3 T of center field at 20 K. In this paper, an HTS magnet for the SPMS cooled by a cryocooler was designed. A HTS magnet consists of several pancakes winding wound from YBCO CC tape. We report out design for a conduction-cooled magnet using YBCO CC tape. For varying the number of double pancake coils (DPCs) and the bending radius, an electromagnetic field analysis is used. We subsequently find a suitable HTS magnet type for an SPMS. This paper describes the quench protection system for an HTS magnet of the SPMS. The detection of any normal zone must be preceded to protect the HTS magnet. We use simulated protection circuit to estimate the trigger conditions. The presented results in this paper will be verified using fabricated protection circuit.</P>
Growth and Temperature Dependence of Band Gap for CdIn2S4 Epilayers byHot Wall Epitaxy
Sukjin Yun,Kwangjoon Hong 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
High quality CdIn2S4 epilayers on GaAs(100) substrate were rst grown by using the hot wall epitaxy (HWE) method. The grown CdIn2S4 epilayer was found to be in the <110> direction. The optimum growth temperatures of the substrate and the source turned out to be 420 and 630 C, respectively. From measurement of the temperature dependence of the Hall mobility, scattering in the high-temperature range was mainly related to the acoustic mode of lattice vibration, and scattering at the low-temperature range was most pronounced, due to the impurity eect. The temperature dependence of the energy band gap on the CdIn2S4/GaAs epilayer, obtained from optical-absorption measurement, was found to be Eg(T) = 2.7116 eV - (7.65 10က4 eV/K)T2/(425 + T).
Sukjin Kim,Jung, Daniel H.,Kim, Jonghoon J.,Bumhee Bae,Sunkyu Kong,Seungyoung Ahn,Jonghoon Kim,Joungho Kim IEEE 2015 IEEE transactions on components, packaging, and ma Vol.5 No.7
<P>As technology develops, the number of chips increases while the thickness of mobile products continuously decreases, which leads to the need for high-density packaging techniques with high numbers of power and signal lines. By applying wireless power transfer technology at the printed circuit board (PCB) and package levels, the number of power pins can be greatly reduced to produce more space for signal pins and other components in the system. For the first time, in this paper, we propose and demonstrate a high-efficiency PCB- and package-level wireless power transfer interconnection scheme. We enhance the efficiency by applying magnetic field resonance coupling using a matching capacitor. The proposed scheme can replace a high number of power interconnections with rectangular spiral coils to wirelessly transfer power from the source to the receiver at the PCB and package levels. The equivalent circuit model is suggested with analytic equations, which is then analyzed to optimize the test vehicle design. For the experimental verification of the suggested model, the $Z$ -parameter results obtained from the model-based equation and measurement of the designed and fabricated test vehicles are compared at up to 1 GHz. The power transfer efficiency from the source coil to the receiver coil in this scheme is able to reach 85.6%. Finally, we designed and fabricated a CMOS full-bridge rectifier and mounted it on the receiver board to convert the transferred voltage from ac voltage to dc voltage. A measured dc voltage of 2.0 V is sufficient to operate the circuit, which generally consists of 1.5 V devices.</P>
A Conceptual Design of a Conduction-Cooled Magnet for a Superconducting Property Measurement System
Sukjin Choi,Seyeon Lee,Joon-Han Bae,Myung-Hwan Sohn,Woo-Seok Kim,Chan Park,Ji-Kwang Lee,Sangjin Lee,Kyeongdal Choi IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>We started a new project to develop the conduction-cooled measurement system for superconducting power apparatus. The measurement system is used to acquire electrical and thermal properties on short HTS tape samples and the system is composed of specimen holder for mounting HTS tape and a magnet for applying magnetic fields externally. The magnet consists of two split racetrack windings and is designed to produce maximum 3 T of center field at 20 K. The temperature of specimen holder can be varied in range from 10 K to 77 K. The field homogeneity, which is calculated the maximum magnetic field divided by the center field, is required less than 0.01 within 10 cm axially and 10 mm radially from origin. We have worked on the conceptual designs of the conduction-cooled magnet for the superconducting characteristic measurement system. The measurement system will be fabricated in near future based on the design parameters presented in this paper.</P>
A Study on the No Insulation Winding Method of the HTS Coil
Sukjin Choi,Hyun Chul Jo,Young Jin Hwang,Seungyong Hahn,Tae Kuk Ko Institute of Electrical and Electronics Engineers 2012 IEEE transactions on applied superconductivity Vol.22 No.3
<P>This paper reports a study on BSCCO and ReBCO HTS (high temperature superconducting) test coils, layer-wound and double-pancake, with and without turn-to-turn insulation. Over current tests were performed in a bath of liquid nitrogen to compare stabilities of the test coils at 77 K. Saturation of magnetic fields from the NI (no insulation) coils, both BSCCO and ReBCO, was observed owing to current bypassing through turn-to-turn contacts in local quenches at operating currents higher than their critical currents. In the NI ReBCO coils, global quenches occurred at operating currents higher than the coil critical currents and quench recoveries were observed during discharge of the coils. The experimental results, obtained to date, demonstrate that the NI winding method enables remarkable improvement of thermal stability of the HTS coils.</P>