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형광영상을 이용한 옥수수 반수체 종자 선발 효율성 향상
김영욱(Younguk Kim),한정헌(Jeong Heon Han),김재영(Jaeyoung Kim),김영태(Yeongtae Kim),김년희(Nyunhee Kim),이채원(Chaewon Lee),이서연(Seoyeoun Lee),김송림(Song Lim Kim),김문종(Moon Jong Kim),류시환(Si Hwan Ryu),이홍로(Hongro Lee),지현소(H 한국육종학회 2022 한국육종학회지 Vol.54 No.4
Many studies concerning breeding maize varieties are in progress in Korea and other countries. Double haploid technology is widely used for the development of commercial maize varieties worldwide, and has also been utilized in Korea since its introduction by the Maize Research Institute, Gangwondo. We performed a study to improve the efficiency of selecting haploid maize seeds using fluorescence imaging. It was verified that anthocyanin produced by the expression of R1-nj gene can be detected by fluorescence imaging, and we developed a high-throughput method for discriminating between haploid and diploid seeds. Compared with discriminating with naked eye, this method reduced the time for discriminating haploid and diploid maize by 91.7% and increased selection accuracy by 16.8% for haploid and 2.2% for diploid maize. This method enabled the acquisition of more haploid seeds and improved the efficiency of breeding research by shortening the time involved.
Optimization of Dual-workfunction Line Tunnel Field-effect Transistor with Island Source Junction
Chaewon Yun,Sangwan Kim,Seongjae Cho,Il Hwan Cho,Hyun Woo Kim,Jang Hyun Kim,Garam Kim 대한전자공학회 2023 Journal of semiconductor technology and science Vol.23 No.4
In this research, a novel dual workfunction (DWF) line tunnel field-effect transistor (LTFET) is optimized by using high WF gate-drain underlap and low WF gate-source underlap. Through numerical technology computer-aided design (TCAD) device simulations, it is confirmed that on-current (ION) can be increased by highly localized point tunneling while suppressing off-current (IOFF) by adjusting the distance between low-WF gate and source junction. Considering on-off current ratio (ION/IOFF) and the process variation, the distance between high-WF gate and source junction is optimized to be 3 to 5 nm.
Kim, Chaewon,Kim, Sung Hwan,Cha, Ji-Hwan,Jang, Changheui,Kim, Tae Kyu Elsevier Sequoia 2019 Surface & coatings technology Vol.374 No.-
<P><B>Abstract</B></P> <P>The surface of oxide dispersion strengthened (ODS) steel was deposited with Cr by physical vapor deposition, followed by inter-diffusion heat treatment (Cr-IDHTed) to form a thin outer Cr-rich carbide layer and inter-diffusion zone below it. When exposed to super-critical carbon dioxide (S-CO<SUB>2</SUB>) environment at 650 °C in 20 MPa for 500 h, a continuous and protective Cr<SUB>2</SUB>O<SUB>3</SUB> layer was formed on Cr-IDHTed ODS steel, resulting in marked reduction in weight gain compared to the as-received one. On the other hand, thick Fe-rich oxides were formed on the as-received ODS steel, resulting in a significant weight gain. The as-received ODS steel showed near complete loss of tensile ductility after S-CO<SUB>2</SUB> exposure due to extensive carburization in matrix. However, because of the presence of thin Cr-rich oxide layer on the surface, carburization was prevented and the change in tensile properties was minimized for Cr-IDHTed ODS steel.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cr was deposited on ODS FM steel and heat treated to form Cr diffusion coated layer. </LI> <LI> Both as-received and Cr diffusion coated specimens were exposed in S-CO<SUB>2</SUB> at 650 °C. </LI> <LI> Large weight gain and severe embrittlement was observed for the as-received specimen. </LI> <LI> Cr diffusion coated specimens showed superior corrosion and carburization resistance. </LI> <LI> Loss of ductility after S-CO<SUB>2</SUB> exposure was negligible for Cr diffusion coated ODS. </LI> </UL> </P>
Kim, Chaewon,Jo, Anjae,Kim, Heeju,Kim, Miso,Lee, Jaegab,Lee, Mi Jung The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.4
Benzothienobenzothiophene ($C_8-BTBT$) is a soluble organic small molecule material with high crystallinity resulting from its strong self-organizing properties. In addition, the high mobility and easy fabrication of $C_8-BTBT$ make it very attractive in terms of organic thin-film transistors. In this work, we made $C_8-BTBT$ thin films by using the zone-casting method; we also used an organic solvent to treat the devices with solvent vapor annealing to improve the electrical properties. As a result, we confirmed improved mobility, threshold voltage, and subthreshold swing after solvent vapor annealing. To prove the effect of solvent vapor annealing, we used the simultaneous extraction model to extract the contact resistance from the current-voltage curve. We confirmed that the electrical properties improved with decreasing contact resistance.
Kim Hyo Jin,Kim Chaewon,Kim Seong Min,Kim Wang Gi 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.10
We have studied the dependence of the growth of GaAs on Si substrate on the flow rate of the source for GaAs seed layer. GaAs buffer with different growth conditions of the inserted GaAs seed has been grown on Si (001) substrate by using metalorganic chemical vapor deposition (MOCVD). Structural properties of the GaAs buffer were investigated by using scanning electron microscopy (SEM) and high-resolution X-ray diffraction (HRXRD). The number of misfit dislocation in the GaAs seeds on Si substrates decreased as the growth rate and the V/III ratio of the GaAs seed were increased and decreased, respectively. Also, we have investigated the improvement in GaAs buffer due to electron beam (e-beam) treatment. The peak position for the GaAs buffer on Si reached the original peak of the GaAs substrate due to the e-beam treatment. Finally, the efficiency of an AlGaAs/GaAs double junction solar cell on a Si substrate was about 22.6%.
A predictive factor of total operation time for robotic-assisted laparoscopic myomectomy
( Chaewon Kim ),( Seong Eun Bak ),( Kyung-min Park ),( Suk-il Kim ),( Mee-ran Kim ) 대한산부인과학회 2019 대한산부인과학회 학술대회 Vol.105 No.-
Objective: The aim of our study is to find out the predictors of TOT in RALM. It will help selecting an adequate patient pool, enhancing preoperative counseling, optimizing operation schedule, and systemizing the intraoperative preparation process, thus improving the perioperative outcomes and patients’ satisfaction. Methods: We conducted a retrospective cohort study of women undergoing RALMs between April 2009 and May 2019 by a single high-volume gynecologic surgeon at the Seoul St. Mary’s hospital. Cases that were performed concomitantly with any other surgical procedure were excluded. Demographic data and intraoperative records were obtained. The association between the number, size, location, FIGO type of myoma and TOT was analyzed. Results: A total of 616 cases met our criteria, with a mean TOT of 234 ± 88 minutes. The mean age of patients was 36.0 ± 5.4. The mean number of myomas removed was 4.2 ± 4.0 and mean largest myoma diameter was 7.7cm ± 2.6cm. Mean total weight of myoma removed was 201.4 ± 151.7g. Only one patient underwent conversion to laparotomy. Preoperative factors intimately associated with TOT were identified with the multiple regression analysis. TOT prolonged as the number of myoma increases (β = 11.69, P < 0.0001) or total myoma weight increases (β = 0.18, P < 0.0001). If the endometrial cavity was exposed during the operation, longer surgery time was needed (β = 23.62, P = 0.002). Age, parity, body mass index, personal history of hypertension and diabetes mellitus, previous abdominal surgery, surgical indication, location of dominant myoma and classification of dominant myoma were not associated with TOT. Conclusion: In this study, we found the total number of myomas, myoma weight, and exposure of endometrial cavity to be significantly correlated to TOT of RALM.
CFD 모사 기법을 이용한 막 모듈 배관 설계 적정성 평가에 관한 연구
김채원(Chaewon Kim),윤석민(Sukmin Yoon),김성수(Seong-Su Kim),김종은(Jongeun Kim),박노석(No-Suk Park) 대한환경공학회 2018 대한환경공학회지 Vol.40 No.3
본 연구에서는 CFD모사와 실험을 통해 저압막이 병렬 배열된 막모듈로 유입되는 구조를 가진 다지관을 대상으로 수리구조를 개선하여 각 모듈로 유입되는 유입유량을 균등하게 분포시킬 수 있는 방안을 제시하고자 하였다. 모듈로 유입되는 유입유량을 균등하게 분포시킬 수 있는 방안을 CFD로 설계한 결과, 헤더 배관 내에 오리피스 배관을 하나 더 설치하는 이중배관원리를 적용함으로써 다지관에서 막모듈로 유입되는 유입유량의 변동계수가 약 76% 감소됨을 확인 하였다. 또한 CFD의 결과를 검증하기 위한 실험에서도 변동계수가 약 50% 감소함으로써 내부에 요철이 있는 오리피스 내관을 설치하는 것이 효과가 있다는 것을 확인하였다. This study was conducted to suggest the hydraulic modification for improving evenness of inlet flow distribution into the manifold pipe having a structure in which the treated water flows in parallel arranged membrane modules using CFD (Computational Fluid Dynamics) simulation and experiment. From a result of CFD simulation, it was confirmed that the standard deviation of the inlet flows into each membrane module from the manifold pipe was reduced by about 76% by installing other orifice pipe inside header pipe (double piping header). In addition, the experimental results showed that the coefficient of variation was reduced by 50% in the case of double piping header compared to the case of single piping header. Consequently, the design concept of doubling header pipe with rough internal pipe is much effective to improve the evenness of the flow distribution rate in parallel arranged membrane modules.