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- Hyejung Kim, Sunyoung Kim, +5 authors Refet Firat Yazicioglu
- IEEE Transactions on Biomedical Circuits andâ€¦
- 2011

This paper describes a mixed-signal ECG System-on-Chip (SoC) that is capable of implementing configurable functionality with low-power consumption for portable ECG monitoring applications. Aâ€¦ (More)

- Hayato Waki, Sunyoung Kim, Masakazu Kojima, Masakazu Muramatsu
- SIAM Journal on Optimization
- 2006

Unconstrained and inequality constrained sparse polynomial optimization problems (POPs) are considered. A correlative sparsity pattern graph is defined to find a certain sparse structure in theâ€¦ (More)

A disadvantage of the SDP (semidefinite programming) relaxation method for quadratic and/or combinatorial optimization problems lies in its expensive computational cost. This paper proposes a SOCPâ€¦ (More)

- Refet Firat Yazicioglu, Sunyoung Kim, Tom Torfs, Hyejung Kim, Chris Van Hoof
- IEEE Journal of Solid-State Circuits
- 2011

This paper presents the design and implementation of an analog signal processor (ASP) ASIC for portable ECG monitoring systems. The ASP ASIC performs four major functionalities: 1) ECG signalâ€¦ (More)

- Sunyoung Kim, Masakazu Kojima, Hayato Waki
- SIAM Journal on Optimization
- 2009

A sensor network localization problem can be formulated as a quadratic optimization problem (QOP). For quadratic optimization problems, semidefinite programming (SDP) relaxation by Lasserre withâ€¦ (More)

Unconstrained and inequality constrained sparse polynomial optimization problems (POPs) are considered. A correlative sparsity pattern graph is defined to find a certain sparse structure in theâ€¦ (More)

Citizen science projects can collect a wealth of scientific data, but that data is only helpful if it is actually used. While previous citizen science research has mostly focused on designingâ€¦ (More)

- Hayato Waki, Sunyoung Kim, Masakazu Kojima, Masakazu Muramatsu, Hiroshi Sugimoto
- ACM Trans. Math. Softw.
- 2008

SparsePOP is a Matlab implementation of the sparse semidefinite programming (SDP) relaxation method for approximating a global optimal solution of a polynomial optimization problem (POP) proposed byâ€¦ (More)

- Sunyoung Kim, Masakazu Kojima, Martin Mevissen, Makoto Yamashita
- Math. Program.
- 2011

A basic framework for exploiting sparsity via positive semidefinite matrix completion is presented for an optimization problem with linear and nonlinear matrix inequalities. The sparsity,â€¦ (More)

- Sunyoung Kim, Masakazu Kojima
- Comp. Opt. and Appl.
- 2003

We show that SDP (semidefinite programming) and SOCP (second order cone programming) relaxations provide exact optimal solutions for a class of nonconvex quadratic optimization problems. It is aâ€¦ (More)