• Current Optics and Photonics
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• v.1 no.2
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• pp.138-142
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• 2017

Terahertz (THz) generation by periodically-poled $KTiOPO_4$ (PPKTP) with a quasi-phase-matching scheme based on cascaded difference frequency generation (DFG) processes is theoretically analyzed. The cascaded Stokes interaction processes and the cascaded anti-Stokes interaction processes are investigated from coupled wave equations. THz intensities and quantum conversion efficiency are calculated. Compared with non-cascaded DFG processes, THz intensities from 10-order cascaded DFG processes are increased to 5.53. The quantum conversion efficiency of 479.4% in cascaded processes, which exceeds the Manley-Rowe limit, can be realized.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.68 no.3
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• pp.114-120
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• 2023

Soybean is the one of the most important crops for providing quality vegetable protein to umans and livestock. Soybean cultivars with a brown seed coat have a wide range of antioxidant benefits because of the flavonoid components. However, they also contain lectin, 7S α′ subunit, lipoxygenase, and Kunitz trypsin inhibitor (KTI) proteins that can be allergenic and digestive inhibitors and reduce processing aptitude. Genetic removal of these four proteins is necessary in soybean breeding. Therefore, this study was conducted to select a new line with brown seed coat, green cotyledon, and tetra-null genotype (lecgy1lox1lox2lox3ti) for lectin, 7S α′ subunit, lipoxygenase, and KTI proteins in the mature seed. Five germplasms were used to create breeding population. From a total of 58 F₂ plants, F₂ plants with lele genotype were selected using a DNA marker, and F₃ seeds with a brown seed coat, green cotyledon, and the absence of 7S α′ subunit protein were selected. Three lines (S1, S2, and S3) were developed. Genetic absence of lectin, 7S α′ subunit, lipoxygenase, and KTI proteins was confirmed in F₆ seeds of the three lines, which had a brown seed coat, green cotyledons, and a white hilum. The 100 seed weights of the three lines were 26.4-30.9 g, which were lower than 36 g of the check cultivar - 'Chungja#3'. The new S2 line with 30.9 g hundred seed weight can be used as a parent to improve colored soybean cultivars without antinutritional factors such as lectin, 7S α′ subunit, lipoxygenase, and KTI proteins.

• Korean Journal of Breeding Science
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• v.40 no.2
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• pp.97-100
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• 2008

Lectin protein and Kunitz trypsin inhibitor (KTI) protein of mature soybean seed are a main antinutritional factor in soybean seed. The Le gene controls a lectin protein and Ti gene controls the KTI protein in soybean. Ti locus has been located on linkage group 9 in the classical linkage map of soybean. Position of Le locus on linkage map was not identified. Genetic relationship between Ti locus and Le locus could be useful in soybean breeding program for the genetic elimination of these factors. The objective of this study was to determine the independent inheritance or linkage between Ti locus and Le locus in soybean seed. Two $F_2$ populations were developed from three parents (Gaechuck#1, T102, and PI548415). The $F_1$ seeds from Gaechuck#1 (titiLeLe) ${\times}$ T102 (TiTilele) and Gaechuck#1 (titiLeLe) ${\times}$ PI548415 (TiTilele) were obtained. The lectin and KTI protein were analysed from $F_2$ seeds harvested from the $F_1$ plants to find independent assortment or linkage between Ti locus and Le locus. The segregation ratios of 3 : 1 for Le locus (129 Le_ : 44 lele) and Ti locus (132 Ti_ : 41 titi) and were observed. The segregation ratios of 9 : 3 : 3 : 1 (95 Le_Li_ : 34 Le_titi: 37 leleTi_ : 7 leletiti) between Le gene and Ti gene in $F_2$ seeds were observed. This data showed that Ti gene was inherited independently with the Le gene in soybean. These results will be helpful in breeding program for selecting the line with lacking both KTI and lectin protein in soybean.

• Bulletin of the Korean Chemical Society
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• v.34 no.9
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• pp.2737-2740
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• 2013

The layered $KTiNbO_5$ was successfully synthesized with titanium(IV) isopropoxide and niobium oxalate by a novel polymerized complex (PC) method. The morphology and structure of the as-prepared sample was characterized by means of High-Resolution Transmission Electron Microscope, powder X-ray diffraction, and Laser Raman Spectroscopy. The spectral response characteristic was recorded by using UV-vis Diffuse Reflectance Spectroscopy. Results show that $KTiNbO_5$ as-prepared by PC method presents an uniform morphology of nano-particles, the mean particle sizes is ca. 28 nm corresponding to the (002), and the crystal structure can be well indexed to the orthorhombic phase. The sample as-prepared by PC method has higher band gap energy than that of the sample prepared by a solid-state reaction method due to the quantum size effect.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1992.10a
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• pp.91-94
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• 1992

• Journal of Magnetics
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• v.5 no.3
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• pp.73-75
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• 2000

Undoped and Cr-doped samples of electrooptic material KTiOPO$_4$ were studied by $^{31}$P nuclear magnetic resonance (NMR). Spin-lattice relaxation time ($T_1$) measurements manifested phase transition behaviors that are attributed to changes in the dominant charge carriers in different temperature ranges.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.243-246
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• 2001

현재 국내에서 가장 많이 쓰이는 분산 미들웨어 기술은 크게 세가지로 구분할 수 있다. OMG(Object Management Group)의 CORBA(Common Object Request Broker Architecture), 마이크로 소프트사의 DOCM/COM+ 그리고 썬(SUN)사의 EJB(Enterprise Java Beans)이다. 이 분산 미들웨어 기술들은 분산환경에서 시스템들간의 운영체제나 프로그래밍 언어에 관계없이 객체 서비스를 제공하여 독립적이고 표준화된 환경을 제공한다. 본 논문에서는 한국통신 초고속사업 중 NMS HelpDesk System(고장관리시스템)의 구축사례를 소개한다. 개발된 시스템은 분산 미들웨어 기술을 이용하여 DCOM/COM 응용시스템, CORBA 서버, 데이터베이스 응용시스템, 그리고 최종 운영자용 웹 인터페이스 시스템 둥으로 구성된 대규모 분산시스템이다.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.4 no.3
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• pp.223-229
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• 1994

$KTP(KTiOPO_4)$ single crystals have been hydrothermally grown in KOH solutions. Properties and Raman spectra of grown crystal were investigated. The most effective solvents for the crystal growth of KTP were KOH and KF solutions. In this study, the properties of KTP single crystals grown hydrothermally at $500^{\circ}C$ in 9 m KOH solution were measured. The following results were obtained : lattice parameters ; a=1.281 nm and c=1.058 nm, density ; $2.94 g/cm^3$, Vickers hardness ; $562kg/cm^2$, refractive indices ; $n_e=1.740$ and $n_e= 1.747.$ And Raman spectra of hydrothermal growth KTP single crystal have been investigated at room temperature under atmospheric pressure. As a result, the $A_1$ modes agree very well with KTP single crystal of high temperatures solution growth but the behavior of $B_2$ modes were slightly different.

• Journal of agriculture & life science
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• v.44 no.5
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• pp.29-33
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• 2010

Soybean (Glycine max (L.) Merr.) seed is the main source of protein and oil for human and animal. The use of soybean protein has been expanded in the food industry due to their excellent nutritional benefits. But, antinutritional and allergenic factors are exist in the raw mature soybean. Lipoxygenase, Kunitz trypsin inhibitor (KTI) protein, and ${\alpha}^{\prime}-subunit$ of 7S globulin are main antinutritional factors in soybean seed. Breeding of a new soybean strain with lacking these components is needed. The objective of this research was to select new soybean line with lipoxygenase-free, KTI-free, and ${\alpha}^{\prime}-subunit$ free (lx1lx1lx2lx2lx3lx3titicgy1cgy1 genotype). Total 434 $F_2$seeds were obtained from the cross of cultivar, "Gaechuck#2" and PI506876. Presence and absence of lipoxygenase, KTI protein, and ${\alpha}^{\prime}-subunit$ of 7S globulin was tested by SDS electrophoresis using a partial seed of each $F_2$seed. Only one $F_2$seed with lacking these three components was selected and was planted to $F_2$plant. Absence of lipoxygenase, KTI, and ${\alpha}^{\prime}-subunit$ protein was confirmed on the $F_3$seeds harvested. Selected line with lx1lx1lx2lx2lx3lx3titicgy1cgy1 genotype might be useful for soybean breeding.

• Korean Journal of Optics and Photonics
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• v.9 no.4
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• pp.236-239
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• 1998

We constructed a frequency doubler with a frequency-stabilized Nd:YAG Laser, a nonlinear crystal KTP, and an external resonant cavity. Using type II phase-making method and a resonant cavity, one usually have a serious problem that the second harmonic conversion efficiency is decreased greatly, for under usual circumstances ordinary ray and extraorninary ray cannot be resonated in a cavity simultaneously. With the change of temperature and incident angle of KTP, we found an optimized condition for the phase-matching and double-resonance. As a result we produced 26 mW of green light with 318 mW of fundamental laser power from a cw Nd:YAG laser.