Joonho Kim

article

Instantons from blow-up

Joonho Kim, Sung-Soo Kim, Ki-Hong Lee, Kimyeong Lee, more

Journal of High Energy Physics > 2019 > 2019 > 11 > 1-49

Abstract We generalize Nakajima-Yoshioka blowup equations to arbitrary gauge group with hypermultiplets in arbitrary representations. Using our blowup equations, we compute the instanton partition functions for 4d N $$ \mathcal{N} $$ = 2 and 5d N $$ \mathcal{N} $$ = 1 gauge theories for arbitrary gauge theory with a large class of matter representations, without knowing explicit construction...

article

On elliptic genera of 6d string theories

Joonho Kim, Kimyeong Lee, Jaemo Park

Journal of High Energy Physics > 2018 > 2018 > 10 > 1-45

Abstract We study the elliptic genera of 6d strings based on their modular properties. They are weak Jacobi forms of weight 0, whose indices are determined from the 2d chiral anomalies. We propose the ansatz for the elliptic genera which reflects the analytic structure of instanton partition functions. Given a finite amount of initial BPS data, we completely determine the elliptic genera of 6d strings...

article

D-type fiber-base duality

Babak Haghighat, Joonho Kim, Wenbin Yan, Shing-Tung Yau

Journal of High Energy Physics > 2018 > 2018 > 9 > 1-34

Abstract M5 branes probing D-type singularities give rise to 6d (1,0) SCFTs with SO × SO flavor symmetry known as D-type conformal matter theories. Gauging the diagonal SO-flavor symmetry leads to a little string theory with an intrinsic scale which can be engineered in F-theory by compactifying on a doubly-elliptic Calabi-Yau manifold. We derive Seiberg-Witten curves for these little string theories...

article

Wilson surfaces in M5-branes

Prarit Agarwal, Joonho Kim, Seok Kim, Antonio Sciarappa

Journal of High Energy Physics > 2018 > 2018 > 8 > 1-33

Abstract We study Wilson surface defects in 6d N=20 $$ \mathcal{N}=\left(2,0\right) $$ superconformal field theories, engineered by semi-infinite M2-branes intersecting M5-branes. Two independent approaches are used to obtain the Wilson surface observables on the T² inside Ω-deformed R⁴ × T². One approach is to compute 5d N=1* $$ \mathcal{N}={1}^{*} $$ instanton partition functions in the presence...

article

6d string chains

Abhijit Gadde, Babak Haghighat, Joonho Kim, Seok Kim, more

Journal of High Energy Physics > 2018 > 2018 > 2 > 1-32

Abstract We consider bound states of strings which arise in 6d (1,0) SCFTs that are realized in F-theory in terms of linear chains of spheres with negative self-intersections 1,2, and 4. These include the strings associated to N small E₈ instantons, as well as the ones associated to M5 branes probing A and D type singularities in M-theory or D5 branes probing ADE singularities in Type IIB string...

article

Little strings on D_n orbifolds

Joonho Kim, Kimyeong Lee

Journal of High Energy Physics > 2017 > 2017 > 10 > 1-31

Abstract We explore two classes of 6d N = 1 0 $$ \mathcal{N}=\left(1,0\right) $$ little string theories obtained from type IIA/IIB NS5-branes probing D_n singularities. Their tensor branches are described by effective gauge theories whose instanton solitons are macroscopic little strings. We specifically study two families of 2d N = 0 4 $$ \mathcal{N}=\left(0,4\right) $$ gauge...

article

Elliptic genus of E-strings

Joonho Kim, Seok Kim, Kimyeong Lee, Jaemo Park, more

Journal of High Energy Physics > 2017 > 2017 > 9 > 1-45

Abstract We study a family of 2d N = 0 , 4 $$ \mathcal{N}=\left(0,\ 4\right) $$ gauge theories which describes at low energy the dynamics of E-strings, the M2-branes suspended between a pair of M5 and M9 branes. The gauge theory is engineered using a duality with type IIA theory, leading to the D2-branes suspended between an NS5-brane and 8 D8-branes on an O8-plane. We compute the elliptic...

article

M5-branes, orientifolds, and S-duality

Yoonseok Hwang, Joonho Kim, Seok Kim

Journal of High Energy Physics > 2016 > 2016 > 12 > 1-28

Abstract We study the instanton partition functions of 5d maximal super Yang-Mills theories with all classical gauge groups. They are computed from the ADHM quantum mechanics of the D0-D4-O4 systems. Our partition functions respect S-dualities of the circle compactified Yang-Mills theories and various orientifold backgrounds. We also compute and study the S⁵ partition functions that correspond to...

article

Study on adhesion strength, thermal creep resistance, and light transmittance of ethylene‐polypropylene copolymer grafted with silane for photovoltaic application

Joonho Kim, Hwi Yong Lee, Ju Young Park, Youn Cheol Kim, more

Journal of Applied Polymer Science > 133 > 22 > n/a - n/a

We investigated the possibility of using PP as an encapsulant in a photovoltaic module. PP is inexpensive but shows low adhesion strength to glass (and silicon wafer) due to its nonpolar nature as well as opacity due to its crystalline nature. We resolved these problems by employing metallocene catalyzed ethylene‐propylene copolymer (EPR) and a nucleating agent to increase the transparency. Five EPRs...

article

Addendum to: General instanton counting and 5d SCFT

Chiung Hwang, Joonho Kim, Seok Kim, Jaemo Park

Journal of High Energy Physics > 2016 > 2016 > 4 > 1-1

article

General instanton counting and 5d SCFT

Chiung Hwang, Joonho Kim, Seok Kim, Jaemo Park

Journal of High Energy Physics > 2015 > 2015 > 7 > 1-65

Abstract Instanton partition functions of 5d N = 1 $$ \mathcal{N}=1 $$ gauge theories are Witten indices for the ADHM gauged quantum mechanics with (0, 4) SUSY. We derive the integral contour prescriptions for these indices using the Jeffrey-Kirwan method, for gauge theories with hypermultiplets in various representations. The results can be used to study various 4d/5d/6d QFTs. In this...

chapter

Fuzzy logic based handoff scheme for heterogeneous vehicular mobile networks

Joonho Kim, Jun-Dong Cho, Jongpil Jeong, Jae-Young Choi, more

2014 International Conference on High Performance Computing & Simulation (HPCS) > 863 - 870

2014 International Conference on High Performance Computing & Simulation (HPCS)

The development of wireless communication systems has resulted in the availability of several access technologies in any geographical area, such as 3G networks, wireless local area networks (WLANs), and wireless broadband networks. The development of these technologies is provided for users who have experienced mobile network environments which are slow or fast with changes in distance between the...

article

Positroid stratification of orthogonal Grassmannian and ABJM amplitudes

Joonho Kim, Sangmin Lee

Journal of High Energy Physics > 2014 > 2014 > 9 > 1-31

Abstract A novel understanding of scattering amplitudes in terms of on-shell diagrams and positive Grassmannian has been recently established for four dimensional Yang-Mills theories and three dimensional Chern-Simons theories of ABJM type. We give a detailed construction of the positroid stratification of orthogonal Grassmannian relevant for ABJM amplitudes. On-shell diagrams are classified by pairing...

article

Carbon dioxide reforming of methane to synthesis gas over LaNi_1−xCr_xO₃ perovskite catalysts

Joonho Kim, Taeyoon Kim, Jung Whan Yoo, Ki Bong Lee, more

Korean Journal of Chemical Engineering > 2012 > 29 > 10 > 1329-1335

Carbon dioxide reforming of methane was investigated over LaNi_1−xCr_xO₃ perovskite catalysts which were prepared by the malic acid method. The respective perovskite catalysts were a single phase of perovskite oxide without impurity phases. Their reduction behavior was characterized by temperature programmed reduction. In the LaNi_1−xCr_xO₃ perovskite catalysts, the catalytic activities were closely...

article

Preparation of thin film YSZ electrolyte by using electrostatic spray deposition

Joonho Kim, Youngsun Park, Dae Jin Sung, Sangjin Moon, more

International Journal of Refractory Metals and Hard Materials > 2009 > 27 > 6 > 985-990

Yttria-stabilized zirconia (YSZ) thin film was successfully deposited onto Ni–YSZ anode disk by the electrostatic spray deposition (ESD) technique. To deposit a dense YSZ thin film onto porous Ni–YSZ substrate, the influence of process parameter variables were examined. The relationship between process parameters and morphologies of YSZ films coated by ESD was investigated by means of SEM photography...

chapter

Design of high-performance unified motion estimation IP for H.264/MPEG-4 video CODEC

Dongyeob Chun, Joonho Kim, Seonyoung Lee, Kyeongsoon Cho

2008 International SoC Design Conference > 1 > I-156 - I-159

2008 International SoC Design Conference

Motion estimation for H.264/MPEG-4 video CODEC is very complex and requires a huge amount of computational effors because it uses multiple reference frames and variable block sizes. This paper describes the architecture and design of high-performance unified motion estimation IP based on fast algorithms for multiple reference frame selection, block matching with variable search window, block mode...

article

Catalytic pyrolysis of chlorodifluoromethane over metal fluoride catalysts to produce tetrafluoroethylene

Dae Jin Sung, Dong Ju Moon, Sangjin Moon, Joonho Kim, more

Applied Catalysis A, General > 2005 > 292 > Complete > 130-137

The catalytic pyrolysis of chlorodifluoromethane (CHClF ₂ , R22) over aluminum fluoride, calcium fluoride and their physical mixtures were investigated. The conversion of R22 and the selectivity of tetrafluoroethylene (TFE) over prepared catalysts were compared with those over a non-catalytic pyrolysis. The conversion of R22 in the catalytic pyrolysis was significantly higher than that in...

INFONA - science communication portal

Search results for: Joonho Kim

Instantons from blow-up

On elliptic genera of 6d string theories

D-type fiber-base duality

Wilson surfaces in M5-branes

6d string chains

Little strings on D_n orbifolds

Elliptic genus of E-strings

M5-branes, orientifolds, and S-duality

Study on adhesion strength, thermal creep resistance, and light transmittance of ethylene‐polypropylene copolymer grafted with silane for photovoltaic application

Addendum to: General instanton counting and 5d SCFT

General instanton counting and 5d SCFT

Fuzzy logic based handoff scheme for heterogeneous vehicular mobile networks

Positroid stratification of orthogonal Grassmannian and ABJM amplitudes

Carbon dioxide reforming of methane to synthesis gas over LaNi_1−xCr_xO₃ perovskite catalysts

Preparation of thin film YSZ electrolyte by using electrostatic spray deposition

Design of high-performance unified motion estimation IP for H.264/MPEG-4 video CODEC

Catalytic pyrolysis of chlorodifluoromethane over metal fluoride catalysts to produce tetrafluoroethylene

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