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EFFECTS OF LARGE-SCALE ENVIRONMENT ON THE ASSEMBLY HISTORY OF CENTRAL GALAXIES
Jung, Intae,Lee, Jaehyun,Yi, Sukyoung K. IOP Publishing 2014 The Astrophysical journal Vol.794 No.1
<P>We examine whether large-scale environment affects the mass assembly history of central galaxies. To facilitate this, we constructed dark matter halo merger trees from a cosmological N-body simulation and calculated the formation and evolution of galaxies using a semi-analytic method. We confirm earlier results that smaller halos show a notable difference in formation time with a mild dependence on large-scale environment. However, using a semi-analytic model, we found that on average the growth rate of the stellar mass of central galaxies is largely insensitive to large-scale environment. Although our results show that the star formation rate (SFR) and the stellar mass of central galaxies in smaller halos are slightly affected by the assembly bias of halos, those galaxies are faint and the difference in the SFR is minute, therefore it is challenging to detect it in real galaxies given the current observational accuracy. Future galaxy surveys, such as the BigBOSS experiment and the Large Synoptic Survey Telescope, which are expected to provide observational data for fainter objects, will provide a chance to test our model predictions.</P>
Lee, Jung-Eun,Kim, Chan,Yang, Hannah,Park, Intae,Oh, Nuri,Hua, Serenus,Jeong, Haneul,An, Hyun Joo,Kim, Sun Chang,Lee, Gyun Min,Koh, Gou Young,Kim, Ho Min American Association for Cancer Research 2015 Molecular Cancer Therapeutics Vol.14 No.2
<P>Antiangiogenic therapies targeting VEGFA have been commonly used in clinics to treat cancers over the past decade. However, their clinical efficacy has been limited, with drawbacks including acquisition of resistance and activation of compensatory pathways resulting from elevated circulating VEGFB and placental growth factor (PlGF). To bypass these disadvantages, we developed a novel glycosylated soluble decoy receptor fusion protein, VEGF-Grab, that can neutralize VEGFA, VEGFB, and PlGF. VEGF-Grab has the second and third immunoglobulin (Ig)-like domains of VEGF receptor 1 (VEGFR1) fused to IgG1 Fc, with three potential glycosylation sites introduced into the third Ig-like domain of VEGF-Grab by mutagenesis. Compared with VEGF-Trap, VEGF-Grab showed more potent decoy activity against VEGF and PlGF, mainly attributed to the VEGFR1 backbone. Most importantly, the negatively charged <I>O</I>-glycans attached to the third Ig-like domain of VEGFR1 counterbalanced the originally positively charged VEGFR1 backbone, minimizing nonspecific binding of VEGF-Grab to the extracellular matrix, and resulting in greatly improved pharmacokinetic profile. These advancements led to stronger and more durable antiangiogenic, antitumor, and antimetastatic efficacy in both implanted and spontaneous tumor models as compared with VEGF-Trap, while toxicity profiles were comparable with VEGF-Trap. Collectively, our results highlight VEGF-Grab as a promising therapeutic candidate for further clinical drug development. <I>Mol Cancer Ther; 14(2); 470–9. ©2014 AACR</I>.</P>
그리드 네트워크에서 글로버스를 이용한 QoS 보장방법에 관한 연구
김정윤(Jung-Yun Kim),조지헌(Jihon Choe),유인태(Intae Ryoo) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
그리드 컴퓨팅은 컴퓨팅 자원을 비용편익 측면에서 가장 효율적으로 만들 수 있는 능력을 가지고 있으며, 클러스터링 등의 기술로는 해결하기 어렵거나 시간이 오래 지체되어지는 대량의 컴퓨팅 능력을 요구하는 어려운 문제들을 풀기에 더 없이 좋은 방법 중에 하나이다. 이러한 그리드 컴퓨팅을 효율적으로 수행하기 위해서 지리적으로 분산되어 있는 고성능 컴퓨팅 자원을 실시간으로 상호 연결하기 위해 Grid Application이 필요하게 되었고, 이에 미국의 ANL(Argonne National Laboratory)를 주축으로 하여 여러 대학의 연구진에 의해 Globus가 만들어지게 되었다. 그러나, 이러한 Globus상에서 Grid Application을 실행시켜 일정의 Job을 네트워크를 통하여 주고받을 때, QoS가 보장되지 않는 문제점이 발견되었다. 그리하여 이러한 문제점을 해결하기 위하여 GARA(Globus Architecture for Reservation and Allocation)가 ANL에 의해서 개발 되었고, 본 논문은 이러한 GARA의 성능을 테스트 하기 위하여 Testbed를 구성하여 GARA의 자원 예약 명령을 통해 자원을 예약을 수행하고, 그에 따른 적용 결과 및 추후 연구방향에 대하여 논하였다.
Kim, Intae,Hahm, Doshik,Park, Keyhong,Lee, Youngju,Choi, Jung-Ok,Zhang, Miming,Chen, Liqi,Kim, Hyun-Cheol,Lee, SangHoon Elsevier 2017 The Science of the total environment Vol.584 No.-
<P><B>Abstract</B></P> <P>We investigated horizontal and vertical distributions of DMS in the upper water column of the Amundsen Sea Polynya and Pine Island Polynya during the austral summer (January–February) of 2016 using a membrane inlet mass spectrometer (MIMS) onboard the Korean icebreaker R/V <I>Araon</I>. The surface water concentrations of DMS varied from <1 to 400nM. The highest DMS (up to 300nM) were observed in sea ice–polynya transition zones and near the Getz ice shelf, where both the first local ice melting and high plankton productivity were observed. In other regions, high DMS concentration was generally accompanied by higher chlorophyll and ΔO<SUB>2</SUB>/Ar. The large spatial variability of DMS and primary productivity in the surface water of the Amundsen Sea seems to be attributed to melting conditions of sea ice, relative dominance of <I>Phaeocystis Antarctica</I> as a DMS producer, and timing differences between bloom and subsequent DMS productions. The depth profiles of DMS and ΔO<SUB>2</SUB>/Ar were consistent with the horizontal surface data, showing noticeable spatial variability. However, despite the large spatial variability, in contrast to the previous results from 2009, DMS concentrations and ΔO<SUB>2</SUB>/Ar in the surface water were indistinct between the two major domains: the sea ice zone and polynya region. The discrepancy may be associated with inter-annual variations of phytoplankton assemblages superimposed on differences in sea-ice conditions, blooming period, and spatial coverage along the vast surface area of the Amundsen Sea.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recent distributions of DMS were investigated throughout the Amundsen Sea. </LI> <LI> DMS hotspots (>150nM) in the polynya were observed during the austral summer. </LI> <LI> Trends of DMS and ΔO<SUB>2</SUB>/Ar were indistinct between the sea ice zone and polynya. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>