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T cell epitopes in SARS-CoV-2 proteins are substantially conserved in the Omicron variant

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Cellular & Molecular Immunology 2022年第3期19卷 447-448页

作者： Seong Jin Choi dong-Uk Kim Ji Yun Noh Sangwoo Kim Su-Hyung Park Hye Won Jeong Eui-Cheol shin Division of Infectious Disease Department of Internal MedicineSeoul National University HospitalSeoulRepublic of Korea Graduate School of Medical Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea Division of Infectious Diseases Department of Internal MedicineKorea University College of MedicineSeoulRepublic of Korea Department of Biomedical Systems Informatics Graduate School of Medical ScienceBrain Korea 21 ProjectYonsei University College of MedicineSeoulRepublic of Korea Department of Internal Medicine Chungbuk National University College of MedicineCheongjuRepublic of Korea The Center for Viral Immunology Korea Virus Research InstituteInstitute for Basic Science(IBS)DaejeonRepublic of Korea

In November 2021,the Omicron variant(B.1.1.529)emerged and was designated a variant of concern(VOC)by the World Health ***,Omicron was reported to extensively escape neutralizing antibodies elicited by COVID-19 vaccination or natural infection[1,2,3].However,whether Omicron evades the T cell immunity elicited by COVID-19 vaccination or natural infection remains to be *** address this issue,we analyzed the amino acid sequences of T cell epitopes identified from the original SARS-CoV-2 strain(Wuhan-Hu-1)in the Omicron variant(hCoV-19/South Africa/CERI-KRISP-K032284/2021).

关键词： neutral conserved elucidated

Effect of TiO_2 on the viscosity and structure of low-fluoride slag used for electroslag remelting of Ti-containing steels

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International Journal of Minerals,Metallurgy and Materials 2017年第1期24卷 18-24页

作者： Cheng-bin Shi Ding-li Zheng Seung-ho shin Jing Li Jung-wook Cho State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Graduate Institute of Ferrous Technology Pohang University of Science and Technology

The viscosity of CaF_2-CaO-Al_2O_3-MgO-（TiO_2） slag was measured using a rotating crucible viscometer. Raman spectroscopy analysis was performed to correlate the viscosity to slag structure. The viscosity of the slag was found to decrease with increasing TiO_2 content in the slag from 0 to 9.73wt%. The activation energy decreased from 95.16 kJ /mol to 79.40 kJ /mol with increasing TiO_2 content in the slag. The introduction of TiO_2 into the slag played a destructive role in Al-O-Al structural units and Q^4 units by forming simpler structural units of Q^2 and Ti_2O_6^（4-） chain. The amount of Al-O-Al significantly decreased with increasing TiO_2 content. The relative fraction of Q^4 units in the [AlO_4]^（5-）-tetrahedral units shows a decreasing trend, whereas the relative fraction of Q^2 units and Ti_2O_6^（4-） chain increases with increasing TiO_2 content accordingly. Consequently, the polymerization degree of the slag decreases with increasing TiO_2 content. The variation in slag structure is consistent with the change in measured viscosity.

关键词： electroslag remelting slag titanium dioxide viscosity structure

Tunnel flexibility effect on the ground surface acceleration response

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Earthquake Engineering and Engineering Vibration 2016年第3期15卷 457-476页

作者： Mohammad Hassan Baziar asoud Rabeti Moghadam Yun wook Choo dong-Soo Kim Center of Excellence for Fundamental Studies in Structural Engineering School of Civil EngineeringIran University of Science and TechnologyTehranIran School of Civil Engineering Iran University of Science and TechnologyTehran1ran Department of Civil and Environmental Engineering College of EngineeringKongju National UniversityChungnam 330-717Republic of Korea Department of Civil and Environmental Engineering Korea Advanced Institute of Science&TechnologyDaejeon 305-701Republic of Korea

Flexibility of underground structures relative to the surrounding medium, referred to as the flexibility ratio, is an important factor that influences their dynamic interaction. This study investigates the flexibility effect of a box-shaped subway tunnel, resting directly on bedrock, on the ground surface acceleration response using a numerical model verified against dynamic centrifuge test results. A comparison of the ground surface acceleration response for tunnel models with different flexibility ratios revealed that the tunnels with different flexibility ratios influence the acceleration response at the ground surface in different ways. Tunnels with lower flexibility ratios have higher acceleration responses at short periods, whereas tunnels with higher flexibility ratios have higher acceleration responses at longer periods. The effect of the flexibility ratio on ground surface acceleration is more prominent in the high range of frequencies. Furthermore, as the flexibility ratio of the tunnel system increases, the acceleration response moves away from the free field response and shifts towards the longer periods. Therefore, the flexibility ratio of the underground tunnels influences the peak ground acceleration （PGA） at the ground surface, and may need to be considered in the seismic zonation of urban areas.

关键词： box-shaped tunnel flexibility ratio acceleration response ground surface centrifuge modeling numericalsimulation

Optimization of thermoelectric properties of n-type Bi_2(Te,Se)_3 with optimizing ball milling time

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Rare Metals 2018年第4期37卷 351-359页

作者： Ji-Hee Son Min-wook Oh Bong-Seo Kim Su-dong Park Thermoelectric Conversion Research Center Korea Electrotechnology Research Institute Department of Materials Science and Engineering Hanbat National University

The thermoelectric properties at elevated temperature were investigated for n-type Bi2（Te,Se）3 which is obtained from ball milling processed powder with various milling times. Electrical properties such as electrical resistivity and Seebeck coefficient are clearly dependent on milling time, in which the carrier concentration is attributed to the change of the electrical properties. The concentrations of the defects are also varied with the ball milling time, which is the origin of the carrier concentration variation. Even though finer grain sizes are obtained after the long ball milling time, the temperature dependence of the thermal conductivity is not solely understood with the grain size, whereas the electrical contribution to the thermal conductivity should be also considered. The highest figure of merit value of ZT = 0.83 is achieved at 373 K for the optimized samples, in which ball milling time is 10 h. The obtained ZT value is 48% improvement over that of the 0.5-h sample at 373 K.

关键词： Thermoelectric properties Ball milling Bi2Te3 Seebeck coefficient Grain size Thermalconductivity

A study on characteristics of shock train inside a shock tube

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Theoretical & Applied Mechanics Letters 2017年第6期7卷 366-371页

作者： dong wook Kim Tae Ho Kim Heuy dong Kim Department of Mechanical Engineering Andong National UniversityAndongKorea

Shock tubes are devices which are used in the investigation of high speed and high temperature flow of compressible gas. lnside a shock tube, the interaction between the reflected shock wave and boundary layer leads to a complex flow phenomenon. Initially a normal shock wave is formed in the shock tube which migrates toward the closed end of the tube and that in turn leads to the reflection of shock. Due to the boundary layer interaction with the reflected shock, the bifurcation of shock wave takes place. The bifurcated shock wave then approaches the contact surface and shock train is generated. Till date only a few studies have been conducted to investigate this shock train phenomenon inside the shock tube. For the present study a computational fluid dynamics （CFD） analysis has been performed on a two dimensional axi-symmetric model of a shock tube using unsteady, compressible Navier-Stokes equations. In order to investigate the detailed characteristics of shock train, parametric studies have been performed by varying different parameters such as the shock tube length, diameter, pressure ratio used inside the shock tube.

关键词： Shock tube Reflected shock wave Boundary layer separation Contact surface Shock train

Single-atom Pd catalyst anchored on Zr-based metal-organic polyhedra for Suzuki-Miyaura cross coupling reactions in aqueous media

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Nano Research 2021年第2期14卷 486-492页

作者： Seongsoo Kim Seohyeon Jee Kyung Min Choi dong-Sik shin Division of Chemical and Bioengineering Kangwon National UniversityGangwon-do 24341Republic of Korea Department of Chemical and Biological Engineering Sookmyung Womens University100 Cheongpa-ro 47-gilYongsan-guSeoul 04310Republic of Korea

The challenge for single-atom catalysts in various C-C cross coupling reaction exists in the development of solid supporting *** has been desired tofind a supporting material designed in molecular level to anchor a single-atom catalyst and provide high degree of dispersion and substrate access in aqueous ***,we prepared discrete cages of metal-organic polyhedra anchoring single Pd atom(MOP-BPY(Pd))and successfully performed a Suzuki-Miyaura cross coupling reaction with various substrates in aqueous *** was revealed that each tetrahedral cage of MOP-BPY(Pd)has 4.5 Pd atoms on average and retained its high degree of dispersion up to 3 months in *** coupling efficiencies of the Suzuki-Miyaura cross coupling reaction exhibited more than 90.0%for various substrates we have tested in the aqueous media,which is superior to those of the molecular Pd complex and metal-organic framework(MOF)anchoring Pd ***,MOP-BPY(Pd)was successfully recovered and recycled without performance degradation.

关键词： metal-organic polyhedra Suzuki-Miyaura cross coupling reaction structure characterization aqueous phase reaction high-degree of dispersion

Liver transplantation for combined hepatocellular carcinoma and cholangiocarcinoma:A multicenter study

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World Journal of Gastrointestinal Surgery 2023年第7期15卷 1340-1353页

作者： Jongman Kim dong-Jin Joo shin Hwang Jeong-Moo Lee Je-Ho Ryu Yang-Won Nah dong-Sik Kim Doo-Jin Kim Young-Kyoung You Hee-Chul Yu Department of Surgery Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351South Korea Department of Surgery Yonsei University College of MedicineSeoul 03722South Korea Department of Surgery Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Surgery Seoul National University College of MedicineSeoul 03080South Korea Department of Surgery Pusan National University College of MedicineBusan 50612South Korea Department of Surgery Ulsan University HospitalUniversity of Ulsan College of MedicineUlsan 44033South Korea Department of Surgery Korea University College of MedicineSeoul 02841South Korea Department of Surgery Gachon University Gil Medical CenterGachon University College of MedicineIncheon 21565South Korea Department of Surgery Seoul St.Mary’s HospitalCollege of Medicinethe Catholic University of KoreaSeoul 06591South Korea Department of Surgery Jeonbuk National University Medical SchoolJeonju 54907South Korea

BACKGROUND Patients with combined hepatocellular carcinoma and cholangiocarcinoma(cHCC-CC)are not traditionally considered eligible for liver transplantation(LT)AIM To compare outcomes between living donor LT(LDLT)patients with hepatocellular carcinoma(HCC)and LT patients with cHCC-CC and to identify risk factors for tumor recurrence and death after LT in cHCC-CC *** Data for pathologically diagnosed cHCC-CC patients(n=111)who underwent LT from 2000 to 2018 were collected for a nine-center retrospective ***(n=141)who received LDLT for HCC at Samsung Medical Center from January 2013 to March 2017 were selected as the control *** patients in two groups,respectively,were selected by 1:1 *** Cumulative disease-free survival(DFS)and overall survival(OS)in the cHCC-CC group were significantly worse than in the HCC group both before and after *** recurrence incidence in the cHCC-CC group was higher than that in the HCC group(75.5%vs 33.3%,P3,tumor size>3 cm,and lymph node metastasis were predisposing factors for tumor recurrence in multivariate *** a maximum tumor size>3 cm was a predisposing factor for *** The poor prognosis of patients diagnosed with cHCC-CC after LT can be predicted based on the explanted *** regular surveillance for cHCC-CC patients should be required for early detection of tumor recurrence.

关键词： Liver transplantation Outcomes Intrahepatic cholangiocarcinoma Hepatocellular carcinoma Recurrence

Male metaplastic breast cancer with poor prognosis:A case report

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World Journal of Clinical Cases 2022年第15期10卷 4964-4970页

作者： Hyun Yul Kim Seungju Lee dong-il Kim Chang shin Jung Jee Yeon Kim Kyung Jin Nam Ki Seok Choo Youn Joo Jung Department of Surgery Pusan National University Yangsan HospitalPusan National University School of MedicineGyeongnam 50612South Korea Department of Pathology Pusan National University Yangsan HospitalPusan National University School of MedicineGyeongnam 50612South Korea Department of Radiology Pusan National University Yangsan HospitalPusan National University School of MedicineGyeongnam 50612South Korea

BACKGROUND Metaplastic breast cancer(MBC)is a rare subtype of breast *** constitute less than 1%of breast cancer cases and are much rarer in *** are few reports of MBC because of its ***,an aggressive type of cancer,is refractory to common treatment modalities of breast cancer and has a poor *** SUMMARY We report a case of MBC in a 78-year-old *** visited our clinic with a palpable mass on the left breast with no masses in the axillary *** had previously undergone robot-assisted laparoscopic radical prostatectomy for prostate cancer,but there was no family history of *** breast mass was visible on ultrasonography,mammography,and magnetic resonance imaging,and chest computed tomography revealed a lung mass in the posterior basal segment of the right lower *** patient was diagnosed with metaplastic carcinoma on core needle biopsy with lung *** mastectomy with sentinel lymph node biopsy and video-assisted segmentectomy of the right lung was ***,multiple metastases appeared 3 mo after surgery in the brain,chest,and abdomen,and the patient died 5 mo after the initial *** MBC is an aggressive and extremely rare breast cancer *** case reports are needed to determine the optimal treatment.

关键词： Breast neoplasm Male Triple-negative breast cancer Metaplastic breast cancer Adjuvant treatment Case report

Percutaneous ablation for perivascular hepatocellular carcinoma: Refining the current status based on emerging evidence and future perspectives

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World Journal of Gastroenterology 2018年第47期24卷 5331-5337页

作者： Tae wook Kang Hyo Keun Lim dong Ik Cha Department of Radiology and Center for Imaging Science Samsung Medical Center Sungkyunkwan University School of Medicine Department of Health Sciences and Technology SAIHST Sungkyunkwan University

Various therapeutic modalities including radiofrequency ablation, cryoablation, microwave ablation, and irreversible electroporation have attracted attention as energy sources for effective locoregional treatment of hepatocellular carcinoma(HCC); these are accepted non-surgical treatments that provide excellent local tumor control and favorable survival. However, in contrast to surgery, tumor location is a crucial factor in the outcomes of locoregional treatment because such treatment is mainly performed using a percutaneous approach for minimal invasiveness; accordingly, it has a limited range of ablation volume. When the index tumor is near large blood vessels, the blood flow drags thermal energy away from the targeted tissue, resulting in reduced ablation volume through a socalled "heat-sink effect". This modifies the size and shape of the ablation zone considerably. In addition, serious complications including infarction or aggressive tumor recurrence can be observed during follow-up after ablation for perivascular tumors by mechanical or thermal damage. Therefore, perivascular locations of HCC adjacent to large intrahepatic vessels can affect post-treatment outcomes. In this review, we primarily focus on physical properties of perivascular tumor location, characteristics of perivascular HCC,potential complications, and clinical outcomes after various locoregional treatments; moreover, we discuss the current status and future perspectives regarding percutaneous ablation for perivascular HCC.

关键词： Hepatocellular carcinoma Perivascular Radiofrequency ablation Liver Cryoablation Microwave ablation Irreversible electroporation