Jong Hyun Ahn

Bio: Jong Hyun Ahn is an academic researcher from Yonsei University. The author has contributed to research in topics: Graphene & Graphene nanoribbons. The author has an hindex of 74, co-authored 287 publications receiving 39786 citations. Previous affiliations of Jong Hyun Ahn include National University of Singapore & University of Illinois at Urbana–Champaign.

The mechanical reliability of transparent ZnO TFT transfer printed on the flexible substrate

Abstract: In this study, we investigated the bendablity and reliability of transparent ZnO TFTs. Transfer printing method was used to make flexible ZnO TFTs. The PET was used as the transparent and flexible plastic substrate which thickness was 188 μm. The bending test and fatigue test were performed to evaluate the mechanical reliability. After reliability tests, the failure mode of ZnO TFTs was analyzed and its results were also confirmed by stress/strain simulation analysis.

Erratum: Supramolecular barrels from amphiphilic rigid–flexible macrocycles

Abstract: Nature Materials 4, 399–402 (2005). In this letter, Figure 1 appeared incorrectly. It should have appeared as shown below.

Apparatus and method for controlling droplet

Abstract: Provided is an apparatus and method for controlling a droplet. The apparatus for controlling the droplet does not contaminate/damage a sample, has a high degree of freedom in droplet control, and is capable of being repeatedly used for a long time. An apparatus (100) for controlling a droplet according to an embodiment includes a flexible substrate (120) having a hydrophobic or oleophobic surface, a dimple formation unit (140), which locally deforms a bottom surface of the flexible substrate (120) to form a dimple, and a driving unit (160), which moves the dimple formation unit (140) at a lower side of the flexible substrate.

Investigation on Metal–Oxide Graphene Field-Effect Transistors With Clamped Geometries

Abstract: In this work, we report on the design, fabrication and characterization of Metal-Oxide Graphene Field-effect Transistors (MOGFETs) exploiting novel clamped gate geometries aimed at enhancing the device transconductance. The fabricated devices employ clamped metal contacts also for source and drain, as well as an optimized graphene meandered pattern for source contacting, in order to reduce parasitic resistance. Our experimental results demonstrate that MOGFETs with the proposed structure show improved high frequency performance, in terms of maximum available gain and transition frequency values, as a consequence of the higher equivalent transconductance obtained.

Method for healing defect of conductive layer, method for forming metal-carbon compound layer, 2D nano materials, transparent electrode and method for manufacturing the same

Abstract: Provided are method for healing defect of conductive layer, method for forming metal-carbon compound layer, 2D nano materials, and transparent electrode and method for manufacturing the same. According to an embodiment of present invention, the method for healing defect of conductive layer comprises: forming a conductive layer on a first metal substrate; contacting the first metal substrate with a salt solution containing a second metal in an ionic form, and forming a second metal particle at least in a portion of a conductive area, the second metal having greater reduction potential than a first metal.

Fast parallel algorithms for short-range molecular dynamics

Abstract: Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter-atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently—those with short-range forces where the neighbors of each atom change rapidly. They can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors. The algorithms are tested on a standard Lennard-Jones benchmark problem for system sizes ranging from 500 to 100,000,000 atoms on several parallel supercomputers--the nCUBE 2, Intel iPSC/860 and Paragon, and Cray T3D. Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems. For large problems, the spatial algorithm achieves parallel efficiencies of 90% and a 1840-node Intel Paragon performs up to 165 faster than a single Cray C9O processor. Trade-offs between the three algorithms and guidelines for adapting them to more complex molecular dynamics simulations are also discussed.

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides.

Abstract: Single-layer metal dichalcogenides are two-dimensional semiconductors that present strong potential for electronic and sensing applications complementary to that of graphene.