Evaluation of Improved Base Editing with Minimized Unexpected Variants as Genome Engineering Tool

Yubeen HEO,Sung Cheon KO,Jaehyun PARK,Gue-Ho HWANG,Han Min WOO,Sangsu BAE 한국생물공학회 2022 한국생물공학회 학술대회 Vol.2022 No.4

다중 수신국 실시간 위성항법데이터 처리 성능향상을 위한 데이터 송,수신 설계

김규헌 ( Gue Heon Kim ),손민혁 ( Min Hyuk Son ),이은성 ( Eun Sung Lee ),허문범 ( Moon Beom Heo ) 한국항공운항학회 2012 한국항공운항학회지 Vol.20 No.4

This paper propose a transmission method for “Transportation system” that can decide precise position under wide area road traffic environment. For precise position detecting,central station collect multiple receiver station`s satellite navigation data and generate correction information. In this process, we need efficient real time transmission method for satellite navigation message that has variable data size. We propose real time data transmission method. This real time transmission method offer efficient processing structure for multiple receiver station`s satellite navigation message. This paper explains proposed real time transmission method and proofs this transmission method.

Operating Atomic Fountain Clock Using Robust DBR Laser: Short-Term Stability Analysis

Lee, Sangmin,Heo, Myoung-Sun,Kwon, Taeg Yong,Hong, Hyun-Gue,Lee, Sang-Bum,Hilton, Ashby Paul,Luiten, Andre Nicholas,Hartnett, John Gideon,Park, Sang Eon Institute of Electrical and Electronics Engineers 2017 IEEE transactions on instrumentation and measureme Vol.66 No.6

<P>We report on a robust distributed Bragg reflector (DBR) laser system for an atomic fountain clock. To confirm the performance of a DBR laser, the short-term stability of an atomic fountain clock, KRISS-F1, is measured with both DBR laser and an extended-cavity diode laser (ECDL) as a master laser in the fountain laser system. The short-term stability of the fountain clock due to the laser noise is determined to be sigma(y)(tau = T-c) = 1.4x10(-14) when either the ECDL or the DBR laser is used as a master laser. The total stability of the fountain clock with the DBR laser is limited to 3.5x 10(-14) at 1 s of averaging time and at the highest atom number in the experiment, which is limited by quantum projection noise. No additional degradation in fountain performance is observed when an ECDL is replaced by the DBR laser. From these results, we conclude that our fountain clock is made much more robust by adopting a DBR laser, which is immune to acoustic and vibrational shocks as well as environmental temperature variations.</P>

Improved absolute frequency measurement of the¹⁷¹Yb optical lattice clock at KRISS relative to the SI second

Kim, Huidong,Heo, Myoung-Sun,Lee, Won-Kyu,Park, Chang Yong,Hong, Hyun-Gue,Hwang, Sang-Wook,Yu, Dai-Hyuk IOP Publishing 2017 Japanese journal of applied physics Vol.56 No.5

유한 요소법을 이용한 복합 적충 구조물의 진동 해석 연구

허동현(Dong-Hyun Heo),김영권(Young-Kewon Kim),신귀수(Gue-Su Shin),이기형(Kee-Hyung Lee),정인성(In-Sung Chung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1

We discuss finite element approximation and use a Mindlin plate element based upon uniformly reduced numerical integration.<br/> The finite element selected for use in this work is a four node, bilinear displacement element based upon the Mindlin theory of plates. Such elements show good accuracy for composite laminated plates when reduced numerical integration is used to evaluate the element marices.<br/> This study presents the experimental and F.E.M results for the natural freguencies of FRP-URETHANE-FRP Composite plate.Agreement between experrimental and calculated frequencies is excellent.<br/>

Consideration of Diluents Selection and Input Amounts of the Hunter Process for Tantalum Production

Jae‑Jin Sim,Sang‑Hoon Choi,Yong‑Kwan Lee,Sung Gue Heo,Taek‑Soo Kim,Seok‑Jun Seo,Kyoung‑Tae Park 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7

Tantalum (Ta) is a heavy refractory metal with an atomic weight of 180.95 g/mol, a density of 16.6 g/cm3, and a high meltingpoint of 3017 °C. With its refractory characteristics, it shows excellent chemical and physical stability as well as corrosionand heat resistance at elevated temperatures. The demand for Ta metal and related compounds is increasing with the expansionof the electronics and chemical industries. The Hunter process was proven to be effective in producing Ta powder in1953. Hunter proposed a method in which potassium heptafluorotantalate (K2TaF7) was reduced by sodium (Na). Thus far,this process has been the primary commercial method to produce Ta powder. In this study, quantitative differences wereanalyzed for diluent selection. Additionally, consideration was given to changes in the caloric value depending on the inputamount of diluents. Finally, the optimum material input and the properties of the prepared Ta were analyzed. Stoichiometricratios of K2TaF7(1 mol), NaCl (6.2–6.7 mol), Na (5–7 mol) were weighed, to perform a metallothermic reduction reaction. After the reaction, the tantalum powder was recovered and the flush process was carried out. After that, it was dried in avacuum atmosphere. Physical properties such as oxygen concentration, PSA, ICP-OES, and XRD of powder were conductedto evaluate the characteristics of Ta powder that was finally manufactured.

Development of High-fidelity Multiplexed Cytosine Base Editor to Reduce Off-target and Improve Editing Efficiency in Corynebacterium glutamicum

Se Hyeon CHO,Yu Been HEO,Gue Ho HWANG,Seok Won KANG,Sang Su BAE,Han Min WOO 한국생물공학회 2023 한국생물공학회 학술대회 Vol.2023 No.4

위암세포 사멸에 미치는 겨우살이 추출물과 항암제의 효과

이용직,허수학,신동규,강성구,김일명,김태희,Lee, Yong-Jik,Heo, Su Hak,Shin, Dong Gue,Kang, Sung-Koo,Kim, Il Myung,Kim, Tae Hee 대한위암학회 2008 대한위암학회지 Vol.8 No.3

목적: 여러 암 치료의 보조 및 대체요법으로서 겨우살이 추출물은 주로 유럽지역에서 이십세기 초부터 널리 사용되었고 현재 국내에서도 항암 대체 치료제로 점차 사용하는 추세이나 그 항암 기전은 아직 명확하게 밝혀져 있지 않다. 본 연구는 겨우살이 추출물이 위암에 미치는 영향을 세포주 실험을 통해 규명하였다. 대상 및 방법: 위암 세포주는 SNU-719 세포주를 사용하였고 처리한 겨우살이 추출물은 (주)한국 아브노바사로부터 제공받은 ABNOBAviscum-Q와 ABNOBAviscum-F 두 가지를 사용하였다. 겨우살이 추출물과 함께 처리한 항암제는 5-FU와 Cisplatin을 사용하였다. CCK-8 assay kit를 사용하여 세포 생존율을 측정하였고 젖산탈수소효소(LDH) assay kit로써 세포 사멸률을 측정하였다. Caspase 3 assay kit를 이용하여 세포자멸사에 관여하는 caspase 3의 활성 변화를 알아보았고 Western blot analysis를 통해 세포자멸사에 관여하는 Bcl2와 p53, 그리고 항암 작용을 하는 PTEN의 단백질 발현량을 측정하였다. 결과: 겨우살이 추출물 Q와 F를 각각 단독 처리한 실험군 보다 항암제인 5-FU와 cisplatin을 병합처리 하였을 때 세포생존율은 더 낮아졌다. Caspase 3의 활성은 겨우살이 추출물 및 항암제 5-FU 처리를 함으로써 대조군에 비해 4~6배 까지 증가하였다. Bcl2의 단백질 발현량은 대조군보다 겨우살이 추출물과 항암제 처리를 통해 감소하였고 두 약물을 함께 처리하였을 경우 더 낮아졌다. p53의 발현은 겨우살이 추출물 처리에는 영향을 받지 않았고 항암제 처리를 통해서만 증가되었다. 또한 항암 작용을 하는 PTEN의 단백질 발현 정도는 겨우살이 추출물 처리를 통해서 의미 있는 변화가 없었다. 결론: 겨우살이 추출물과 항암제인 5-FU 및 cisplatin 등을 병합 처리 할 경우 위암 세포 사멸에 있어 상승효과를 보였다. 본 연구결과에서 겨우살이 추출물의 항암효과는 caspase 3의 활성화와 Bcl2 발현의 감소를 통해 세포자멸사를 유발하며 이 세포자멸사 유도 기전은 p53과는 상관없음(p53-independent)을 알 수 있었다. Purpose: Mistletoe extract was widely used for cancer treatment as complementary or alternative therapy in European area from early twenty century. It is currently used as alternative anti-cancer remedy by piecemeal in domestic medical group, however, the anti-cancer mechanism of mistletoe extract was not known precisely until now. In this study the effect of mistletoe extract on gastric cancer was studied vis cell line experiments. Materials and Methods: The SNU719 gastric cancer cell line was used, and ABNOBAviscum-Q and ABNOBAviscum-F were treated to cells as mistletoe extract, or 5-FU and cisplatin were used with mistletoe extract. The cell viability and cell death rate were estimated by CCK-8 assay kit and lactate dehydrogenase (LDH) assay kit in each. Caspase 3 assay kit was used to measure caspase 3 activity. The protein expression amounts of Bcl2, p53, and PTEN were estimated through Western blot analysis. Results: The co-treatments of mistletoe extract Q/F and 5-FU/cisplatin decreased lesser cell viability than only mistletoe treat. Caspase 3 activity was increased 4~6 times in co-treatment of mistletoe extracts and 5-FU than control. Bcl2 protein expression was reduced by mistletoe extracts or anti-cancer drugs, further more, the co-treatment of mistletoe extracts and 5-FU/cisplatin diminished more the expression than only mistletoe treatment. Mistletoe extracts did not affect the protein expressions of p53 and PTEN. Conclusion: It was concluded that the anti-cancer mechanism of mistletoe extracts was made by caspase 3 activation and lowered Bcl2 expression, and this apoptosis inducing mechanism was independent to p53.

미슬토 추출물(Mistletoe Extract)이 위암환자의 수술 후 면역기능에 미치는 효과

양성우,신동규,김일명,윤성민,이용직,허수학,김태희,Yang, Sung-Woo,Shin, Dong-Gue,Kim, Il-Myung,Yoon, Seong-Min,Lee, Yong-Jik,Heo, Su-Hak,Kim, Tae-Hee 대한위암학회 2007 대한위암학회지 Vol.7 No.3

목적: 미슬토 추출물은 서양에서 오래전부터 사용되어진 면역치료 물질로 위암에 대해서는 연구가 부족한 실정이다. 본 연구에서 수술 받은 위암환자를 대상으로 항암제와 미슬토 추출물의 병합투여가 면역기능에 미치는 효과를 파악하기 위해 시행되었다. 대상 및 방법: 원발성 위암으로 진단받고 근치적 수술을 받은 10명의 환자를 선정하여 항암화학요법과 병행하여 수술 후 7일째부터 미슬토 추출물(ABNOVA viscum-Q)을 주 3회, 총 16주간 피하주사 하였다. 면역기능에 미치는 효과는 환자의 말초혈액에서 백혈구수와 그 분획, 백혈구에 대한 총림프구의 분율 그리고 시토카인들(Interleukin-$1{\beta}$, Interleukin-2, Interleukin-6, Interferon-$\gamma$, Tumor necrosis factor-$\alpha$)의 변화를 분석하였다. 상기 항목들은 수술 전과 수술 후 8주, 16주 총 3회 측정되었다. 결과: 남녀비는 9 : 1이며, 평균연령은 55.9세(range $33{\sim}74$세)였다. 병기는 stage Ib가 4명, II가 6명이었다. 백혈구수와 총호중구수는 기저치에 비해 치료 후 8주와 16주에 유의한 감소를 보였다. 총호산구수는 기저치에 비해 8주와 16주에 증가하는 경향을 보였지만 통계적 유의성은 없었다(P=0.15). 총림프구의 수치는 치료 전후 유의한 감소를 보이지만 백혈구 수에 대한 총 림프구의 분율은 유의하지는 않지만(P=0.91) 오히려 증가하고 있다. 각각의 시토카인들은 치료전후 큰 변화를 보이지 않았다. 결론: 치료 전후 의미있는 면역반응의 증가는 관찰하기 어려웠다. 이것은 미슬토 추출물과 항암제의 병용투여에 의한 면역활성과 억제의 상쇄반응으로 생각된다. 총호산구수가 증가하였고, 백혈구에 대한 림프구의 분율이 감소하지 않고 증가하는 양상을 보인 것은 미슬토 추출물에 의해 유발된 면역반응으로 생각된다. Purpose: Mistletoe (Viscum album L.) extract is one of the most widely used agents in alternative cancer therapeutic regimens in Europe. This study was conducted to determine the effect of mistletoe extract on immune function in gastric cancer patients. Materials and Methods: Ten patients that had undergone a curative gastrectomy were enrolled in the prospective study. ABNOBAviscum $Q^{(R)}$ was injected subcutaneously three times a week from postoperative-day 7 to week 16 with an increasing dose. All of the patients simultaneously received chemotheraphy with mitomycin, oral 5-FU and a cisplatin regimen. The WBC count, differential count, lymphocyte/WBC ratio and the level of cytokines (IL-$1{\beta}$, IL-2, IL-6, IFN-$\gamma$, TNF-$\alpha$) were checked in the peripheral blood preoperatively, at postoperative week 8 and at postoperative week 16. Results: The WBC and neutrophil counts significantly decreased after treatment on week 8 and week 16 (P=0.001), but the total eosinophil count was slightly increased (P=0.15). The total lymphocyte count also decreased during treatment but the lymphocyte/WBC ratio was slightly increased without statistical significance (P=0.91). The cytokine levels did not significantly change during treatment. Conclusion: It is somewhat difficult to determine the direct effect of mistletoe therapy on immune function as the effect may be compromised by the concurrent chemotherapy. It can be assumed that the slightly increased lymphocyte/WBC ratio and eosinophil count may be a result of the immunomodulatory effect of the mistletoe extract.

위암에서 RUNX3 발현의 임상적 의의

장성화,신동규,김일명,유병욱,윤진,박상수,강성구,이윤경,허수학,조익행,Jang, Sung-Hwa,Shin, Dong-Gue,Kim, Il-Myung,You, Byung-Ook,Yoon, Jin,Park, Sang-Su,Kang, Sung-Gu,Lee, Yun-Kyung,Heo, Su-Hak,Cho, Ik-Hang 대한위암학회 2007 대한위암학회지 Vol.7 No.4

목적: Runt-related transcription factor 3 (RUNX3)는 새로운 tumor Suppressor로써 최근 많은 연구들이 여러 암을 대상으로 진행되고 있다. 그러나 위암에 대한 임상연구는 아직까지 보고가 많지 않은 상태이다. 이에 저자들은 본 연구에서 위암조직에서의 RUNX3의 발현율과 임상적 의의에 대해 분석을 시행하였다. 대상 및 방법: 2001년 1월부터 2005년 12월까지 서울의료원에서 위암으로 근치적 수술을 시행 받은 124명을 대상으로 하였다. 이들 환자에서 적출된 위 조직으로 만들어진 파라핀 블록을 이용해 위암조직 124예를 채취하여 RUNX3 발현을 면역조직화학염색으로 확인한 후 비교분석 하였다. RUNX3 염색결과는 핵과 세포질에서 양성과 음성으로 나누어 각각 판독하였으며 통계분석은 SPSS 11.0을 사용하였다. 결과: 대상 환자의 평균 연령은 61세($33{\sim}87$세)였으며 남자 81명(65.3%), 여자 43명(34.7%)으로 1.9 : 1이었다. 위암조직에서 RUNX3의 발현율은 59.7% (74/124명)이었으며 위암세포에서 주로 세포질에 발현되었다. 위암조직의 분화도에 따른 RUNX3 발현의 차이에서 분화도가 양호한 경우의 발현율(핵내: 9.1%, 세포질: 57.0%)에 비해 분화도가 나쁜 경우 발현율(핵내: 5.2%, 세포질: 46.6%)이 낮았으나 통계적 유의성은 없었다(P=0.133). 위암조직에서의 RUNX3 발현 유무와 생존율 사이에 통계적 유의성은 없었다(P=0,626). 5년 생존율과 연관지어 단변량, 다변량 분석 통계에서 의미가 있었던 것은 UICC TNM 병기뿐이었다(P<0.001). TNM 병기별 5년 생존율은 IA-93.6%, IB-90.9%, II-81.7%, IIIA-30.0%, IIIB-31.3%, IV-22.7%였다. 결론: 위암조직에서 RUNX3 핵 내 발현이 위암조직의 분화도가 좋을수록 발현율이 높았다. RUNX3의 핵 내 발현율이 생존율에 미치는 영향은 단변량, 다변량 분석에서는 유의성이 없어 향후 이에 대한 좀 더 많은 증례로 유의성을 찾는 연구가 필요할 것으로 생각된다. Purpose: RUNX3, a novel tumor suppressor, is frequently inactivated in gastric cancer. In the present study, we examined the pattern of RUNX3 expression in gastric cancer cells from gastric cancer specimens and the impact of its alteration on clinical outcome. Materials and Methods: A total of 124 samples of both gastric cancer and normal tissue were obtained from 124 patients who underwent curative gastrectomy at the Seoul Medical Center from January 2001 to December 2005. RUNX3 expression was determined by immunohistochemical staining, and the results were analyzed. Statistical analysis wabased on clinicopathological findings and differences in survival rates. Results: The mean age of the patients was 61 years, and the male:female ratio was 1.9:1. The expression rate of RUNX3 was 59.7% (74/124). The expression rate was higher in differentiated gastric cancers (nucleus: 9.1%, cytoplasm: 57.6%) than in the undifferentiated types (nucleus: 5.2%, cytoplasm: 46.6%) (P=0.133). The 5-year survival rates according to RUNX3 expression determined from cancer tissue were 88.9% for the nucleus $\pm$ cytoplasm(+) group of patients, 76.1% for the cytoplasm only (+) group of patients, and 65.3% for the RUNX3 negative expression group of patients (P=0.626). Only UICC TNM staging showed statistical significance related to the survival rate, as determined by multivariate analysis. Conclusion: The RUNX3 expression rate was higher in differentiated gastric cancer than in the undifferentiated types without significance. Although RUNX3 expression predicted better survival, based on multivariate analysis, the finding was not statistically significant. More cases should be further evaluated.