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Kim, Si-Jin,Kim, Min-Cheol,Han, Sang-Beom,Lee, Gyu-Ho,Choe, Hui-Seon,Kwak, Da-Hee,Choi, Sun-Yong,Son, Byung-Goo,Shin, Myoung-Sun,Park, Kyung-Won Elsevier 2016 Nano energy Vol.27 No.-
<P><B>Abstract</B></P> <P>Despite extremely high capacity of Si-based anodes in lithium-ion batteries (LIB), Si-based materials have shown a structural collapse caused by a volumetric expansion/contraction during the cycling process. The conventional electrode structure, which consists of active materials, a current collector, a conducting agent, and a binder, actually showed a low loading of active material due to the other heavy components. In this study, we prepared a 3D flexible Si-composite electrode consisting of core (Si)-shell (Si<SUB>3</SUB>N<SUB>4</SUB>) NPs (Si@Si<SUB>3</SUB>N<SUB>4</SUB>) and carbon nanofibers (denoted as Si-composite/CNF). The Si-composite/CNF was directly utilized as an anode in the absence of the other components was electrochemically evaluated using a coin-type cell. The Si-composite/CNF showed a high capacity of 665mAhg<SUP>−1</SUP> at a fairly high current density of 10Ag<SUP>−1</SUP> and an extremely low capacity loss for 2000 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We prepared Si-composite/CNF exhibits a 3D flexible Si-composite electrode. </LI> <LI> The electrode consists of core (Si)-shell (Si<SUB>3</SUB>N<SUB>4</SUB>) NPs (Si@Si<SUB>3</SUB>N<SUB>4</SUB>) and carbon nanofibers. </LI> <LI> The Si-composite/CNF was directly utilized as an anode. </LI> <LI> Si-composite /CNF exhibited high specific capacity and improved high rate cycling performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
1T DRAM with Raised SiGe Quantum Well for Sensing Margin Improvement
Si-Won Lee,Seongjae Cho,Il Hwan Cho,Garam Kim 대한전자공학회 2023 Journal of semiconductor technology and science Vol.23 No.1
In this paper, a novel one-transistor dynamic random-access memory (1T DRAM) with a raised SiGe quantum well (QW) under one gate in the double-gate (DG) structure is proposed. The proposed structure can improve the poor performance of the retention time and sensing margin which is the problem of the conventional 1T DRAM. In write operation, the performance is improved through the band to band tunneling (BTBT) between body and drain and through valence band offset between SiGe and Si. Also by utilizing the physical barrier of oxide, read “1” retention time can be increased. The fabrication process is also proposed.
SiC 단결정의 TSSG 공정을 위한 전이금속 특성 연구
이승준,유용재,정성민,배시영,이원재,신윤지,Lee, Seung-June,Yoo, Yong-Jae,Jeong, Seong-Min,Bae, Si-Young,Lee, Won-Jae,Shin, Yun-Ji 한국결정성장학회 2022 한국결정성장학회지 Vol.32 No.2
본 연구에서는 SiC 단결정의 TSSG 공정중 결정 품질을 저하시키지 않으면서도 의도하지 않은 질소 도핑(N-UID)을 쉽게 제어하기 위해 지금까지 Co 또는 Sc 전이금속을 첨가한 신규 용융조성을 제안한다. Co 또는 Sc의 특성을 파악하기 위해 Ar 분위기에서 1900℃ 온도에서 약 2시간 동안 열처리 실험을 수행했다. 용융조성은 Si-Ti 10 at% 또는 Si-Cr 30 at%를 비롯하여, 탄소 용해도에 효과적이라고 알려진 Co 또는 Sc을 각각 3 at% 첨가하였다. 열처리 후 도가니 단면을 가공하여 도가니-용융물 계면에서 발생한 Si-C 반응층을 관찰하고, 탄소황분석을 통해 조성에 따른 탄소 용해도를 간접적으로 분석하였다. 그 결과, Si-Sc 기반 용융조성이 TSSG 공정에 적합한 특성을 갖는 Si-C반응층을 형성하고 있었다. 또한 탄소황분석 결과에서도 Cr 다음으로 높은 탄소량이 갖는 것으로 분석되었다. Sc는 Cr에 비해 질소와의 반응성이 낮은 이점을 가지므로 TSSG 공정에 Si-Sc 용융조성을 적용하면, 본 연구에서 의도한 대로 SiC 단결정 성장속도와 질소 UID를 모두 제어할 수 있는 것으로 고려된다.
고품질 4H-SiC 단결정 성장을 위한 다공성 흑연 판의 역할
이희준,이희태,신희원,박미선,장연숙,이원재,여임규,은태희,김장열,전명철,이시현,김정곤,Lee, Hee-Jun,Lee, Hee-Tae,Shin, Hee-Won,Park, Mi-Seon,Jang, Yeon-Suk,Lee, Won-Jae,Yeo, Im-Gyu,Eun, Tai-Hee,Kim, Jang-Yul,Chun, Myoung-Chul,Lee, Si-Hyun 한국결정성장학회 2015 한국결정성장학회지 Vol.25 No.2
본 연구에서는 PVT법으로 4H-SiC 단결정 성장 시 다공성 흑연판을 사용하여 Si/C 비율이나 온도구배, 물질전달의 향상시킴으로써 고품질의 SiC 단결정 기판 제작을 목적으로 연구를 진행하였다. 연구에 사용된 SiC 소스 물질은 흑연 도가니에 넣어 흑연 단열재로 쌓인 구조로 실험을 하였다. 성장온도는 $2100{\sim}2300^{\circ}C$, 그리고 성장압력은 10~30 Torr의 압력으로 아르곤과 질소 분위기에서 성장시켰다. 종자정은 2인치의 $4^{\circ}$ off-axis 4H-SiC의 C면 (000-1)을 사용하였고 다공성 흑연판은 SiC 소스 물질 위에 삽입하였다. 4H-SiC 결정다형 안정화를 위한 C-rich 조건이나 균일한 온도구배를 만들어주기 위해 다공성 흑연판을 삽입하여 실험을 진행하였다. 일반적인 도가니의 경우, 성장된 wafer에서 6H-, 15R-SiC와 같은 다양한 결정다형이 관찰된 반면에 다공성 흑연판을 삽입한 도가니에서는 4H-SiC만 관찰되었다. 또한 다공성 흑연판을 삽입한 도가니에서 성장된 결정에서 MP나 EP의 낮은 결함밀도를 보였으며 결정성 또한 향상된 것을 학인하였다. The present research is focused on the effect of porous graphite what is influenced on the 4H-SiC crystal growth by PVT method. We expect that it produces more C-rich and a change of temperature gradient for polytype stability of 4H-SiC crystal as adding the porous graphite in the growth cell. The SiC seeds and high purity SiC source materials were placed on opposite side in a sealed graphite crucible which was surrounded by graphite insulator. The growth temperature was around $2100{\sim}2300^{\circ}C$ and the growth pressure was 10~30 Torr of an argon pressure with 5~15 % nitrogen. 2 inch $4^{\circ}$ off-axis 4H-SiC with C-face (000-1) was used as a seed material. The porous graphite plate was inserted on SiC powder source to produce a more C-rich for polytype stability of 4H-SiC crystal and uniform radial temperature gradient. While in case of the conventional crucible, various polytypes such as 6H-, 15R-SiC were observed on SiC wafers, only 4H-SiC polytype was observed on SiC wafers prepared in porous graphite inserted crucible. The defect level such as MP and EP density of SiC crystal grown in the conventional crucible was observed to be higher than that of porous graphite inserted crucible. The better crystal quality of SiC grown using porous graphite plate was also confirmed by rocking curve measurement and Raman spectra analysis.
Stress-relieved Si anode on a porous Cu current collector for high-performance lithium-ion batteries
Moon, Sang-Hyun,Kim, Si-Jin,Kim, Min-Cheol,So, Jin-Young,Lee, Ji-Eun,Shin, Yeon-Kyung,Bae, Won-Gyu,Park, Kyung-Won Elsevier 2019 Materials chemistry and physics Vol.223 No.-
<P><B>Abstract</B></P> <P>To overcome the mechanical stress generated during the cycling process in lithium-ion batteries, Si anode is fabricated on a porous Cu current collector with holes using sputtering deposition method. The porous Cu/Si shows superior high-rate and cycling performance in lithium-ion batteries compared to the Si anode on the flat Cu. The excellent high-rate performance and stable cyclability of the porous Cu/Si can be predominantly attributed to the efficient relief of the stress generated by the volumetric expansion of the Si anode on the porous Cu current collector.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Si anode for LIBs was fabricated on a porous Cu current collector having holes. </LI> <LI> The porous Cu/Si showed the superior high-rate and cycling performance. </LI> <LI> The excellent performance of the porous Cu/Si can be due to the relief of the stress. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Ji-Hye,Son, Myoung-Won,Kim, Kyung-Ju,Oh, Mee-Hye,Cho, Hyundeuk,Lee, Hyun Ju,Jang, Si-Hyong,Lee, Moon Soo The Korean Gastric Cancer Association 2016 Journal of gastric cancer Vol.16 No.1
Purpose: Transducer-like enhancer of split 1 (TLE1) is a member of the Groucho/TLE family of transcriptional co-repressors that regulate the transcriptional activity of numerous genes. TLE1 is involved in the tumorigenesis of various tumors. We investigated the prognostic significance of TLE1 expression and its association with clinicopathological parameters in gastric cancer (GC) patients. Materials and Methods: Immunohistochemical analysis of six tissue microarrays was performed to examine TLE1 expression using 291 surgically resected GC specimens from the Soonchunhyang University Cheonan Hospital between July 2006 and December 2009. Results: In the non-neoplastic gastric mucosa, TLE1 expression was negative. In GC, 121 patients (41.6%) were positive for TLE1. The expression of TLE1 was significantly associated with male gender (P=0.021), less frequent lymphatic (P=0.017) or perineural invasion (P=0.029), intestinal type according to the Lauren classification (P=0.024), good histologic grade (P<0.001), early pathologic T-stage (P=0.012), and early American Joint Committee on Cancer stage (P=0.022). In the Kaplan-Meier analysis, the TLE1 expression was significantly associated with longer disease-free (P=0.022) and overall (P=0.001) survival rates. Conclusions: We suggested that TLE1 expression is a good prognostic indicator in GCs.
Lee, Jang Eun,Yoon, Na Ri,Kim, Jin Dong,Song, Myeong Jun,Kwon, Jung Hyun,Bae, Si Hyun,Choi, Jong Young,Jeong, Sung Won,Yoon, Seung Kew The Korean Society of Gastroenterology 2011 대한소화기학회지 Vol.57 No.3
<P>Background/Aims: Pegylated interferon plus ribavirin combination therapy has been the standard of therapy for patients with chronic hepatitis C. Although previous studies have reported long term durability after the sustained virologic response (SVR) with standard therapy for chronic hepatitis C, it is still unclear in Korea. The aim of this study was to evaluate the relapse rate and related factors after SVR to pegylated interferon therapy in Korean patients with chronic hepatitis C. Methods: A total of 119 chronic hepatitis C patients were treated with pegylated interferon plus ribavirin, and 73 patients achieved SVR (61.3%). Among 73 patients who achieved SVR, 68 patients (genotype 1, n=40; genotype non-1, n=28) were evaluated for virological response after SVR. Results: SVR rate in genotype 1 and genotype non-1 were 52.5%, and 65.1%, respectively. Relapse after SVR occurred in 5 patients (7.4%) with genotype 1, and the median time to relapse from SVR was 10 months. Univariate analysis revealed that the dose reduction of pegylated interferon (p=0.005) and cirrhosis (p=0.03) were significantly associated with relapse. Conclusions: These results suggested that the relapse could occur even after SVR achievement in Korean patients with chronic hepatitis C, and the dose reduction of pegylated interferon during treatment or having cirrhosis may increased the risk for relapse.</P>
Long-Term Preservation of Chicken Primordial Germ Cells Derived from Different Chicken Strains
Si Won Kim,Jeong Hyo Lee,Tae Sub Park 한국수정란이식학회 2016 한국수정란이식학회 학술대회 Vol.2016 No.10
Germ cells originate outside of the fetal gonads and migrate toward the genital ridges through the embryonic tissue. Germ cell is the most important and valuable cell in livestock because germ cell is the only cell type that can transfer the genetic information and content into the next generation. In this study, we established the primordial germ cell (PGC) lines derived from the fetal gonads of 6 day-old-embryonic chicks, and then cryopreserved for long-term storage. First, we determined each chick embryo sex by genomic PCR with DNA extracted from blood. After dissociation of the whole gonads from individual embryos, total gonadal cells were plated into the culture dish and cultured with 20% fetal bovine serum-contained culture media. PGC lines were derived from three different chicken strains; White Leghorn (WL), Korean Oge (KO), and a commercial line, Hyline. There was no significant difference between the efficiencies of the PGC line derivation according to the different chicken strains. Thus, PGC culture and long-term storage system could be applied to maintain the endangered avian species and also produce the offspring through germline chimera production system.