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Search Results: 1 - 10 of 152 matches for " Jihun Hamm "
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Probabilistic Zero-shot Classification with Semantic Rankings
Jihun Hamm,Mikhail Belkin
Computer Science , 2015,
Abstract: In this paper we propose a non-metric ranking-based representation of semantic similarity that allows natural aggregation of semantic information from multiple heterogeneous sources. We apply the ranking-based representation to zero-shot learning problems, and present deterministic and probabilistic zero-shot classifiers which can be built from pre-trained classifiers without retraining. We demonstrate their the advantages on two large real-world image datasets. In particular, we show that aggregating different sources of semantic information, including crowd-sourcing, leads to more accurate classification.
Crowd-ML: A Privacy-Preserving Learning Framework for a Crowd of Smart Devices
Jihun Hamm,Adam Champion,Guoxing Chen,Mikhail Belkin,Dong Xuan
Computer Science , 2015,
Abstract: Smart devices with built-in sensors, computational capabilities, and network connectivity have become increasingly pervasive. The crowds of smart devices offer opportunities to collectively sense and perform computing tasks in an unprecedented scale. This paper presents Crowd-ML, a privacy-preserving machine learning framework for a crowd of smart devices, which can solve a wide range of learning problems for crowdsensing data with differential privacy guarantees. Crowd-ML endows a crowdsensing system with an ability to learn classifiers or predictors online from crowdsensing data privately with minimal computational overheads on devices and servers, suitable for a practical and large-scale employment of the framework. We analyze the performance and the scalability of Crowd-ML, and implement the system with off-the-shelf smartphones as a proof of concept. We demonstrate the advantages of Crowd-ML with real and simulated experiments under various conditions.
A note on del Pezzo fibrations of degree 1
Jihun Park
Mathematics , 2001,
Abstract: We study del Pezzo fibrations of degree 1 with terminal singularities. A connection between singularities on del Pezzo surfaces of degree 1 and Kodaira's classification of elliptic singular fibers will be studied in this paper. By this investigation we obtain several results on birational maps of del Pezzo fibrations of degree 1 with terminal singularities.
Birational maps of del Pezzo fibrations
Jihun Park
Mathematics , 1999,
Abstract: In this paper, we study rigidity of nonsingular del Pezzo fibrations over a germ of smooth curve.
Factorial hypersurfaces in P^4 with nodes
Ivan Cheltsov,Jihun Park
Mathematics , 2005,
Abstract: We prove that for n= 5, 6, 7, a nodal hypersurface of degree n in P^4 is factorial if it has at most (n-1)^2-1 nodes.
Birationally rigid Fano threefold hypersurfaces
Ivan Cheltsov,Jihun Park
Mathematics , 2013,
Abstract: We prove that every quasi-smooth hypersurface in the 95 families of weighted Fano threefold hypersurfaces is birationally rigid.
Log Canonical Thresholds and Generalized Eckardt Points
Ivan Cheltsov,Jihun Park
Mathematics , 2000,
Abstract: Let $X$ be a smooth hypersurface of degree $n\geq 3$ in $\mathbb{P}^n$. We prove that the log canonical threshold of $H\in|-K_X|$ is at least $\frac{n-1}{n}$. Under the assumption of the Log minimal model program, we also prove that a hyperplane section $H$ of $X$ is a cone in $\mathbb{P}^{n-1}$ over a smooth hypersurface of degree $n$ in $\mathbb{P}^{n-2}$ if and only if the log canonical threshold of $H$ is $\frac{n-1}{n}$.
Log canonical thresholds on Gorenstein canonical del Pezzo surfaces
Jihun Park,Joonyeong Won
Mathematics , 2009, DOI: 10.1017/S001309150900039X
Abstract: We classify all the effective anticanonical divisors on weak del Pezzo surfaces. Through this classification we obtain the smallest number among the log canonical thresholds of effective anticanonical divisors on a given Gorenstein canonical del Pezzo surface.
Weighted Fano threefold hypersurfaces
Ivan Cheltsov,Jihun Park
Mathematics , 2005,
Abstract: We study birational transformations into elliptic fibrations and birational automorphisms of quasismooth anticanonically embedded weighted Fano 3-fold hypersurfaces having terminal singularities classified by A.R. Iano-Fletcher, J. Johnson, J. Kollar, and M. Reid.
Halphen Pencils on Weighted Fano Threefold Hypersurfaces
Ivan Cheltsov,Jihun Park
Mathematics , 2006,
Abstract: We classify all pencils on a general weighted hypersurface in $\mathbb{P}(1,a_{1},a_{2},a_{3},a_{4})$ of degree $\sum_{i=1}^{4}a_{i}$ whose general members are surfaces of Kodaira dimension zero.
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