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Preferential elimination of metallic single-walled carbon nanotubes using microwave irradiation
Shim, Hyung Cheoul,Song, Jin-Won,Kwak, Yoon Keun,Kim, Soohyun,Han, Chang-Soo IOP Pub 2009 Nanotechnology Vol.20 No.6
<P>This study presents a simple, easy and rapid technique for the preferential destruction of metallic single-walled carbon nanotubes (m-SWNTs) using microwave irradiation. The proportion of m-SWNTs in a randomly networked film that were made of pristine SWNTs was gradually reduced with microwave irradiation of 1000 W at 2.45 GHz ranging from 0 to 20 min. Additionally it was observed that the m-SWNTs with a higher chiral angle were destroyed first. The Raman spectra and drain current–gate voltage characteristics curve show that this method facilitated the selective removal of m-SWNTs. </P>
Hwang, Soohyun,Kim, Donguk,Kim, Minha,Baek, Dohyun,Park, Jin-Hong,Song, Woochang,Shim, Joong-Pyo,Lee, Jaehyeong American Scientific Publishers 2018 Science Of Advanced Materials Vol.10 No.1
<P>Thin films of CdS were prepared by chemical bath deposition (CBD) for use as a buffer layer in high efficiency Cu(In,Ga)(Se,S)(2) (CIGS) thin film solar cells. Cadmium sulfate (CdSO4) and cadmium acetate (Cd(CH3CO2)(2), CdAc2) were used as cadmium sources; we investigated the influence of the particular cadmium source on the properties of the films. Crystalline structure was analyzed using X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM), and optical transmittance and reflectance were measured by ultravioletvisible-near infrared (UV-VIS-NIR) spectrophotometry. The CdS films deposited from CdSO4 are more uniform, exhibit better crystallinity, and have higher optical transmittance. Thin film CIGS solar cells having a CdS buffer layer from CdSO4 show higher efficiency: 14.26% compared to 11.83% for CdS from CdAc2. This is mainly a result of higher short-circuit current density (J(sc)) and increased fill-factor.</P>
Experimental Observation of Hidden Berry Curvature in Inversion-Symmetric Bulk 2H−WSe2
Cho, Soohyun,Park, Jin-Hong,Hong, Jisook,Jung, Jongkeun,Kim, Beom Seo,Han, Garam,Kyung, Wonshik,Kim, Yeongkwan,Mo, S.-K.,Denlinger, J. D.,Shim, Ji Hoon,Han, Jung Hoon,Kim, Changyoung,Park, Seung Ryong American Physical Society 2018 Physical Review Letters Vol.121 No.18
Efficient Electron Transfer in Functional Assemblies of Pyridine-Modified NQDs on SWNTs
Jeong, Sohee,Shim, Hyung Cheoul,Kim, Soohyun,Han, Chang-Soo American Chemical Society 2010 ACS NANO Vol.4 No.1
<P>Nanocrystal quantum dot (NQD)/single-walled carbon nanotube (SWNT) hybrid nanomaterials were synthesized, assembled into field effect transistors (FETs) <I>via</I> dielectrophoresis (DEP), and characterized optically and electronically. The pyridine moiety functioned as a short, noncovalent linker between the NQDs and SWNTs and allowed more efficient carrier transfer through the assemblies without deleteriously altering electronic structures. Photoluminescence studies of the resulting assemblies support an efficient carrier transfer process in CdSe-<I>py</I>-SWNTs unlike that of CdSe/ZnS-<I>py</I>-SWNTs. The use of DEP as a means of controlling the assembly process allowed the creation of a SWNT array containing densely packed CdSe NQDs across a 2 μm gap between electrodes. Observations and characterization of the photocurrent, resistivity, gate dependence, and optical properties of these systems suggest efficient electron transfer from photoexcited NQDs to SWNTs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-1/nn9009938/production/images/medium/nn-2009-009938_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn9009938'>ACS Electronic Supporting Info</A></P>
( Dahee Kim ),( Sohyun Shim ),( Soohyun Kim ),( Jiyeon Kim ),( Yeonkyung Cho ),( Sungshin Shim ),( Kyoungjin Lee ),( Donghyun Cha ),( Heejin Park ) 대한산부인과학회 2016 대한산부인과학회 학술대회 Vol.102 No.-
목적: To investigate the value of placental growth factor (PlGF) and soluble fms-like tyrosine kinase-1 (sFlt-1) for predicting preeclampsia or small for gestational age (SGA) in pregnant women. 방법: This prospective cohort single center study was conducted in 474 women with singleton pregnancy. We measured plasma levels of pregnancy- associated plasma protein-A(PAPP-A), serum levels of alpha-fetoprotein (MSAFP), unconjugated estriol (uE3), inhibin-A and human chorionic gonadotropin (hCG) at 15+0 to 20+6 weeks of gestation. We also assessed the plasma levels of sFlt-1 and PlGF at 24+0 to 28+6 and 29+0 to 37+6 weeks of gestation, using the Elecsys assay and calculated sFlt-1/PlGF ratio. Uterine artery doppler ultrasonography with color flow mapping was performed at 20+0 to 24+6 weeks of gestation. 결과: Respectively, 29 and 19women had SGA fetus or preeclampsia comparing to 426 uncomplicated pregnant women with AGA fetus. In PE group, the level of sFlt-1 and sFlt-1/PlGF ratio were higher (2nd : 2630.5 vs 1389, 10 vs 2.6, p<0.05; 3rd : 7295 vs 2386, 83.7 vs 8.25, p<0.05) and the level of PlGF was significantly lower (2nd : 215.9 vs 530.1, p<0.05; 3rd : 119.9 vs 294.95, p<0.05) than control group in 2nd trimester and 3rd trimester. However, in SGA group, these factors didn’t show significant difference in both second trimester and third trimester. The time-dependent slope of the sFlt-1/PlGF ratio between 2nd and 3rd trimester was significantly steeper in PE compared to control and SGA group. Such as Uterine artery resistance index, pulsatility index and S/D ratio in SGA group, but not in PE group. 결론: Measurements of PlGF, sFlt-1 and sFlt-1/PlFT ratio were useful markers for the prediction of preeclampsia but not of SGA.
( Hyejin Hwang ),( Youngshin Han ),( Soohyun Shim ),( Hyunkyoung Kim ),( Younjee Chung ),( Mee-ran Kim ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Objective: Demonstrate a new instrument, technique or procedure Target: Adanced practicioners Methods: 35 year old married women came for heavy menstrual bleeding and subfertility; she failed IVF3 times before. In MRI, multiple myomas including Figo stage type 2 submucosal myoma were noted. For conserving fertility, we decided to robot assisted laparoscopic myomectomy. Real-time hystero-sonography was used to locate the embedded myoma and the exact incision site was determined. The serosa and myometrial layer was cut using the robotic monopolar scissors. To avoid thermal damage to uterus, vasopressin mixed fluid was used instead of coagulation. As the myoma is being removed, endometrial cavity can be visualize. At this point filling up the cavity with carmin fluid can help visualize endometrial cavity well. Furthermore, filling up the cavity with fluid can help detect any endometrial injury. And then, enucleation of myoma is possible. After the myoma is completely distracted, suturing is done with the PDS. Because we can locate the endometrial cavity, layer by layer suturing is possible. Results: Total 20 myomas were removed, and no endometrium injury was detected. Patient was recovered and discharged 2 days after operation. After 3 month, pelvic sonography was done, and distorsion of endometrial cavity was recovered and heavy menstrual bleeding disappeared. Conclusion: Myoma is one of the common gynecology disease. Although most myomas are benign, some kind of submucosal myomas can cause heavy menstrual bleeding and subfertility. In general, hysteroscopic resection is used for myomectomy but it may injure normal endometrium and cause adhesion. Robot asissted laparoscpic myomectomy can be a good option for submucosal myomectomy for the patient who want to conserve fertility.
Kim Do-Gyun,Shim Joon-Yong,Cho Byoung-Kwan,Wakholi Collins,Seo Youngwook,Cho Soohyun,Lee Wang-Hee 아세아·태평양축산학회 2020 Animal Bioscience Vol.33 No.7
Objective: The aim of this study was to identify a distribution pattern of meat quality grade (MQG) as a function of carcass yield index (CYI) and the gender of Hanwoo (bull, cow, and steer) to determine the optimum point between both yield and quality. We also attempted to identify how pre- and post-deboning variables affect the gender-specific beef quality of Hanwoo. Methods: A total of 31 deboning variables, consisting of 7 pre-deboning and 24 post-deboning variables from bulls (n = 139), cows (n = 69), and steers (n = 153), were obtained from the National Institute of Animal Science (NIAS) in South Korea. The database was reconstructed to be suitable for a statistical significance test between the CYI and the MQG as well as classification of meat quality. Discriminant function analysis was used for classifying MQG using the deboning parameters of Hanwoo by gender. Results: The means of CYI according to 1+, 1, 2, and 3 of MQG were 68.64±2.02, 68.85± 1.94, 68.62±5.88, and 70.99±3.32, respectively. High carcass yield correlated with low-quality grade, while high-quality meat most frequently was obtained from steers. The classification ability of pre-deboning parameters was higher than that of post-deboning parameters. Moisture and the shear force were the common significant parameters in all discriminant functions having a classification accuracy of 80.6%, 71%, and 56.9% for the bull, cow, and steer, respectively. Conclusion: This study provides basic information for predicting the meat quality by gender using pre-deboning variables consistent with the actual grading index.
Highly efficient computer algorithm for identifying layer thickness of atomically thin 2D materials
Lee, Jekwan,Cho, Seungwan,Park, Soohyun,Bae, Hyemin,Noh, Minji,Kim, Beom,In, Chihun,Yang, Seunghoon,Lee, Sooun,Seo, Seung Young,Kim, Jehyun,Lee, Chul-Ho,Shim, Woo-Young,Jo, Moon-Ho,Kim, Dohun,Choi, Hy IOP 2018 Journal of Physics. D, Applied Physics Vol.51 No.11
<P>The fields of layered material research, such as transition-metal dichalcogenides (TMDs), have demonstrated that the optical, electrical and mechanical properties strongly depend on the layer number <I>N</I>. Thus, efficient and accurate determination of <I>N</I> is the most crucial step before the associated device fabrication. An existing experimental technique using an optical microscope is the most widely used one to identify <I>N</I>. However, a critical drawback of this approach is that it relies on extensive laboratory experiences to estimate <I>N</I>; it requires a very time-consuming image-searching task assisted by human eyes and secondary measurements such as atomic force microscopy and Raman spectroscopy, which are necessary to ensure <I>N</I>. In this work, we introduce a computer algorithm based on the image analysis of a quantized optical contrast. We show that our algorithm can apply to a wide variety of layered materials, including graphene, MoS<SUB>2</SUB>, and WS<SUB>2</SUB> regardless of substrates. The algorithm largely consists of two parts. First, it sets up an appropriate boundary between target flakes and substrate. Second, to compute <I>N</I>, it automatically calculates the optical contrast using an adaptive RGB estimation process between each target, which results in a matrix with different integer <I>N</I>s and returns a matrix map of <I>N</I>s onto the target flake position. Using a conventional desktop computational power, the time taken to display the final <I>N</I> matrix was 1.8 s on average for the image size of 1280 pixels by 960 pixels and obtained a high accuracy of 90% (six estimation errors among 62 samples) when compared to the other methods. To show the effectiveness of our algorithm, we also apply it to TMD flakes transferred on optically transparent <I>c</I>-axis sapphire substrates and obtain a similar result of the accuracy of 94% (two estimation errors among 34 samples).</P>