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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.
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).
Kim, Sukjin,Choi, Jong-Seo,Kang, Shingu,Park, Jeong-Hwa,Hong, Sunha,Kim, Tae-su,Yang, Woonho 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 $106{\mu}m$ 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 $SiO_2$ 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.
미생물 작용과 화학적 방법을 이용한 치약의 우식예방효과 연구
이상대,박기철,홍석진,정성숙 단국대학교 치과대학 예방치과 1998 예방치과 세미나집 Vol.- No.12
The purposes of this study were to compare a microbial model and a chemical pH cycling model for the remineralization. Two test dentifrices, NaF-silica abrasive system with and without sanguinaria were used in this study to delineate the antiplaque effect via microbial model. Subsurface lesion were prepared by exposing bovine enamel specimens to a lactate Carbopol buffer system for 44 hours. The three test groups were placebo, NaF-silica abrasive dentifrices with and without 0.1% sanguinaria, The specimens were assigned to 6 test groups of 12 specimens each by randomized blocks with VHN stratification. The microbial reminerallization model was used as described previously(Hong et al.^2)). The chemical model used in this study was a modification of the method of White^29). The specimens were treated for 15 days with either chemical or microbial remineralization model. Preand post- surface VHN values were randomly obtained. Once the results were decoded by test groups, the △VHN values were determined. The results of △ VHN(mean±S.D.) for each group were; For chemical model; 9.5±5.0(placebo, No Fluoride/silica abrasive); 68.3±6.2(1,000ppm F, NaF/silica abrasive); 70.4±5.8(1,000ppm F NaF plus 0.1% sanguinaria/silica abrasive); For microbial Model: 18.4±7.2(Placebo, No Fluoride/silica abrasive); 33.5±10.4(1,000ppm F, NaF/silica abrasive); 42.3±9.2(1,000ppm F, NaF plus 0.1% sanguinaria/silica abrasive). Statistical analyses of these results indicated that NaF-silica dentifrice without sanguinaria was as effective as that with sanguinaria on surface hardening in chemical model. However, NaF-silica dentifrice with sanguinaria was more effective than that of without sanguinaria in microbial model, indicating the benefit of sanguinaria. Therefore, it is concluded that the microbial model used in this study is suitable for the testing of remineralization benefit of the dentifrices containing antiplaque agents.
An enhanced bandwidth planar inverted‐F antenna with a modified shorting strip
Park, Hoon,Jung, Heekyung,Hong, Sukjin,Choi, Jaehoon Wiley Subscription Services, Inc., A Wiley Company 2007 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.49 No.3
<P><B>Abstract</B></P><P>This article presents a novel design method for a wideband planar inverted F‐antenna that simultaneously covers GSM900, GPS, DCS1800, IMT2000, WLAN, and DMB services. The proposed antenna consisted of a main patch with stubs, an I‐shaped patch, and a modified shorting strip. It had dimensions of 16 × 36 × 6 mm<SUP>3</SUP>. The dual band characteristic could be achieved by changing the length of a main patch. A very wide impedance bandwidth characteristic was obtained by optimizing the length of stubs, an I‐shaped patch, and a modified shorting strip. Commercial electromagnetic software, CST Microwave Studio, was used to design the structure. The maximum gains at the frequencies of 915, 1576, 1785, 2170, 2400, and 2630 MHz were 1.0, 2.7, 5.4, 4.56, 1.52, and 2.95 dBi, respectively. The overall radiation pattern was suitable for mobile applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 513–515, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22179</P>
스틸-알루미늄 하이브리드 구조를 적용한 전륜 서브프레임 연구
김태진(Taejin Kim),윤석진(Sukjin Yoon),박정환(Junghwan Park),홍학표(Hakpyo Hong),김준형(Junhyung Kim),송권민(Gwonmin Song) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The most important point in the future automotive industry is about managing the enhanced environmental regulation. To meet them, companies are trying to increase fuel efficiency and ligten weight. Subframe that is located under the body delivers the noise and vibration and endures fatigue. In this reason, normally steel is used in many subframes, but it has high weight. Substituting steel with aluminum is able to lighten weight at a high ratio. This study will introduce the method how to develop an aluminum die-casting bracket, which is able to lighten weight and cost reduction by substituting steel with aluminum. By developing this bracket, we achieved the result that is weight reduction by 8% and the decrease in the number of parts by 20%.
Quench Analysis of a Superconducting Magnet for RISP 28 GHz ECR Ion Source
Seunghyun Song,Tae Kuk Ko,Sukjin Choi,In Seok Hong,Hyoungku Kang,Min Cheol Ahn Institute of Electrical and Electronics Engineers 2015 IEEE transactions on applied superconductivity Vol.25 No.3
<P>This paper presents quench analysis of a superconducting magnet system for 28 GHz electron cyclotron resonance (ECR) ion source. The magnet system consists of a hexapole coil and four solenoid coils located outside of the hexapole one. All coils were wound with NbTi wire and impregnated by epoxy. To analyze the characteristic of superconducting coil when the quench occurs, a numerical code was developed. The analysis procedures are as follows. First, normal zone propagation (NZP) velocity which is as a function of magnetic field was calculated. Second, a fraction of the winding volume was obtained by transient analysis, considering longitudinal and transverse NZP velocities. Third, a generated resistance and temperature rising over time were simulated. Lastly, current trace of the coil was calculated. The current trace calculated by simulation well agrees with the test result. Also the result of hot-spot temperature is reasonable. Since simulated hot-spot temperature and experimental result are 60.32 K and 63 K when the operating current is 169 A. The normal zone resistances are also identical for 1.13 s which is the convergence time of simulation. The final resistances are about 10.2 Ω and 11.23 Ω. Therefore it is expected that the analysis code can be used to estimate the characteristic of superconducting magnet when the quench occurs.</P>