Sahu, J.K., Yoo, S., Boyland, A.J., Kalita, M.P., Basu, C., Webb, A.S., ...
Photodarkening in highly Yb-doped aluminosilicate and phosphosilicate fibers, under 488 nm irradiation, is presented. Both irradiation-induced excess loss and post-irradiation temporal loss...
Bismuth-doped fiber laser at 1.16 microns (2008)
Yoo, S., Kalita, M.P., Sahu, J.K., Nilsson, J., Payne, D.N.
We used a bismuth-doped fiber with high pump absorption, 1.2 dB/m, to make a short (25 m) Bi-fiber laser at 1.16 μm with 10% efficiency. We discuss the influence of host glass and unsaturable...
High power fiber sources (2008)
Nilsson, J., Jeong, Y., Codemard, C.A., Farrell, C., Ji, J., ...
High power fiber lasers and amplifiers have reached several kilowatts of output power, and are now leading contenders for many important applications. Beyond raw power, fibers offer advantages such...
Photodarkening in Yb-doped aluminosilicate fibers induced by 488 nm irradiation (2007)
Yoo, S., Basu, C., Boyland, A.J., Sones, C., Nilsson, J., Sahu, J.K., ...
Photodarkening of Yb-doped aluminosilicate fibers by continuous wave 488 nm irradiation was investigated. The irradiation induced significant excess loss in the UV-visible spectroscopy (VIS) region...
Erbium:ytterbium co-doped large-core fiber laser with 297W continuous-wave output power (2007)
Jeong, Y., Yoo, S., Codemard, C.A., Nilsson, J., Sahu, J.K., Payne, D.N., ...
We have demonstrated a high-power and high-efficiency erbium:ytterbium (Er:Yb) co-doped fiber laser that produces 297 W of continuous-wave output at 1567 nm. The slope efficiency with respect to the...
Progress in active fibers (2007)
Sahu, J.K., Yoo, S., Kim, J., Boyland, A.J., Webb, A., Nilsson, J., ...
Progress in active fibers for high power fiber sources is discussed. The waveguiding geometry naturally lends itself to high-power diffraction-limited operation. Further refinements allow for the...
High control in high power fiber lasers and amplifiers (2007)
Jeong, Y., Maran, J.N., Yoo, S., Boyland, A.J., Sahu, J.K., Nilsson, J.
We discuss fundamental aspects and future prospects of high power fiber lasers and amplifiers with particular attention to high control of cladding-pumped, rare-earth-doped fiber sources in a...
We performed a constrained search for the geometries of low-lying neutral germanium clusters GeN in the size range of 21≤N≤29. The basin-hopping global optimization method is employed for the...
Depressed clad hollow optical fiber with fundamental LP01 mode cut-off (2006)
Kim, J., Dupriez, P., Soh, D.B.S., Codemard, C., Yoo, S., Jeong, Y., ...
We propose a depressed clad hollow optical fiber with fundamental (LP01) mode cut-off suitable for high power short-wavelength, especially three-level, fiber laser operation by introducing highly...
High-power and high-brightness fiber sources (2006)
Sahu, J.K., Nilsson, J., Jeong, Y., Kim, J., Dupriez, P., Yoo, S., ...
Over the past few years, the fiber lasers and amplifiers have advanced from low-power systems for telecommunication applications to multi kW level sources suitable for industrial applications such as...
High-power master-oscillator power amplifiers based on rare-earth-doped fibres (2006)
Jeong, Y., Nilsson, J., Dupriez, P., Codemard, C., Farrell, C., Sahu, J.K., ...
In recent years there have been dramatic advances in fibre lasers. Currently, conventional single-strand cladding-pumped fibre lasers can generate output powers beyond 1 kW with high beam quality....
Koishi, Takahiro, Yasuoka, Kenji, Ebisuzaki, Toshikazu, Yoo, S., Zeng, Xiao Cheng
We performed large-scale molecular-dynamics simulation of nanoscale hydrophobic interaction manifested by the formation of nanobubble between nanometer-sized hydrophobic clusters at constrained...
Melting temperature of ice Ih calculated from coexisting solid-liquid phases (2005)
Wang, J., Yoo, S., Bai, Jaeil, Morris, James R., Zeng, Xiao Cheng
The purpose of this paper is twofold: (1) to compute the melting temperature (Tm) of ice Ih with both TIP4P and TIP5P models by using the two-phase coexistence method and to compare with previously...
Search for global minimum geometries for medium sized germanium clusters: Ge12-Ge20 (2005)
Bulusu, S., Yoo, S., Zeng, Xiao Cheng
We have performed an unbiased search for the global minimum geometries of small-to-medium sized germanium clusters Gen (12≤n≤18) as well as a biased search (using seeding method) for Gen...
Hardware/Software cosimulation from interface perspective (2005)
The aim is to explain the current issues of HW/SW cosimulation and to introduce a new challenge of HW/SW cosimulation for multiprocessor SoC (MPSoC). Most of the current issues are related to raising...
Introduction to hardware abstraction layers for SoC (2005)
In this paper, the hardware abstraction layer (HAL) is explained in the context of SoC design. First, a HAL definition is given and the difference between HAL and other similar concepts is explained....
Hardware/software cosimulation from interface perspective (2005)
The aim is to explain the current issues of HW/SW cosimulation and to introduce a new challenge of HW/SW cosimulation for multiprocessor SoC (MPSoC). Most of the current issues are related to raising...
Yb:Al-doped depressed clad hollow optical fiber laser operating at 980nm (2005)
Kim, J., Soh, D.B.S., Codemard, C., Yoo, S., Jeong, Y., Nilsson, J., ...
We demonstrate an Yb-doped cladding-pumped depressed-clad hollow optical fiber laser emitting a single-mode beam at 980 nm with a slope efficiency of 34% and up to 3.1W of output power.
High-power fiber lasers: progress and opportunities (2005)
Nilsson, J., Jeong, Y., Soh, D.B.S., Codemard, C.A., Dupriez, P., Farell, C., ...
Cladding-pumped fiber lasers and amplifiers offer a number of unique properties. These enabled the very rapid power-scaling seen in the last few years. However, there are many additional advantages,...
Soh, Daniel B.S., Grudinin, A.B., Nilsson, J., Jeong, Y., Yoo, S., Kim, J., ...
An explicit analytical form for the Stokes pulse evolution in parabolic amplification is derived for the first time. In order to achieve efficient pulse compression, the parabolic amplifiers should...
Nanoscale Hydrophobic Interaction and Nanobubble Nucleation (2004)
Koishi, T., Yoo, S., Yasuoka, K., Zeng, Xiao Cheng, Narumi, T., Susukita, R., ...
We report large-scale atomistic simulation of midrange nanoscale hydrophobic interaction, manifested by the nucleation of nanobubble between nanometer-sized hydrophobes at constrained equilibrium....
The melting lines of model silicon calculated from coexisting solid-liquid phases (2004)
Yoo, S., Zeng, Xiao Cheng, Morris, James R.
The melting line is an important thermodynamic property of materials and can be calculated via computer simulation, given the intermolecular potential for the materials. Conventionally, the...
Low-Power SoC with Power-Aware Operating Systems Generation (2004)
Yoo, S., Bouchhima, A., Cesario, W., Jerraya, A.A., Gauthier, L.
The power consumption of integrated circuits is one of the most problematic considerations affecting the design of high-performance chips and portable devices. The study of power-saving design...
Yoo, S., Youssef, W., Bouchhima, A., Jerraya, A.A., Diaz-Nava, M.
In conventional multiprocessor SoC (MPSoC) design methods, we find two problems: lack of SW code portability and lack of early SW validation. The problems cause a long design cycle. To resolve them,...
Debugging HW/SW interface for MPSoC: video encoder system design case study (2004)
Youssef, W., Yoo, S., Sasongko, A., Paviot, Y., Jerraya, A.A.
We report a case study of multiprocessor SoC (MPSoC) design of a complex video encoder, namely OpenDivX. OpenDivX is a popular version of MPEG4. It requires massive computation resources and deals...
Bacivarov, I., Jerraya, A.A., Yoo, S.
Modern electronic system design is based on integrating heterogeneous components ( mu P, DSP, ASIC, memories, buses, MEMS, MOEMS, etc.) on a single chip. These highly integrated systems are commonly...
Bouchhima, A., Yoo, S., Jerraya, A.A.
We propose a methodology to perform early design stage validation of hardware/software (HW/SW) systems using a HW/SW interface simulation model. Given a SW application described at the OS abstraction...
Effect of polarizability of halide anions on the ionic salvation in water clusters (2003)
Yoo, S., Lei, Y.A., Zeng, Xiao Cheng
Molecular dynamics simulation has been performed to study the effect of the polarizabilities of model anions on the ionic solvation in water clusters. The primary focus is given to the surface versus...
Global geometry optimization of silicon clusters described by three empirical potentials (2003)
The "basic-hopping" global optimization technique developed by Wales and Doye is employed to study the global minima of silicon clusters Sin (3
Introduction to Hardware Abstraction Layers for SoC (2003)
In this paper, we explain hardware abstraction layer (HAL) and related issues in the context of SoC design. First, we give a HAL definition and examples of HAL function. HAL gives and abstraction of...
Scheduling and timing analysis of HW/SW on-chip communication in MP SoC design (2003)
Cho, Y., Lee, G., Choi, K., Yoo, S., Zergainoh, N.
On-chip communication design includes designing software parts (operating system, device drivers, interrupt service routines, etc.) as well as hardware parts (on-chip communication network,...
Embedded Software for SoC (2003)
Jerraya, A.A., Yoo, S., Verkest, D., Wehn, N.
Embedded Software for SoC covers all software related aspects of SoC design: -Embedded and application-domain specific operating systems, interplay between application, operating system, and...
Multi-level software validation for NoC (2003)
Yoo, S., Nicolescu, G., Bacivarov, I., Youssef, W., Bouchhima, A., Jerraya, A.A.
This chapter presents a problem in conventional methods of validating software design for NoC: software validation at different abstraction levels. As a solution to resolve the problem, a method of...
Yoo, S., Bacivarov, I., Bouchhima, A., Paviot, Y., Jerraya, A.A.
As a fast and accurate SW simulation model, we present a model called fast timed SW model. The model enables fast simulation by native execution of application SW and OS. It gives simulation accuracy...
Monte Carlo simulation of vapor-liquid binodal of water (2002)
Among many popular potential models of water, the nonpolarizable four-site TIP4P potential is one of the more widely used. Recently, two new potential models of water on the basis of the TIP4P...
Component-Based Design Approach for Multicore SoCs (2002)
W. Cesrio, A. Baghdadi, L. Gauthier, D. Lyonnard, G. Nicolescu, Y. Paviot, ...
This paper presents a high-level component-based methodology and design environment for application-specific multicore SoC architectures. Component-based design provides primitives to build complex...
Automatic generation of fast timed simulation models for operating systems in SoC design (2002)
Yoo, S., Nicolescu, G., Gauthier, L., Jerraya, A.A.
To enable fast and accurate evaluation of HW/SW implementation choices of on-chip communication, we present a method to automatically generate timed OS simulation models. The method generates the OS...
Desiderata for the specification and design of electronic systems (2002)
Nicolescu, G., Svarstad, G., Cesario, W., Gauthier, L., Lyonnard, D., Yoo, S., ...
The evolution of electronic systems requires the use of new specification languages, joining together the necessary concepts for specification, validation and refinement for the design of circuits...
Component-based design approach for multicore SoCs (2002)
Cesario, W., Baghdadi, A., Gauthier, L., Lyonnard, D., Nicolescu, G., Paviot, Y., ...
This paper presents a high-level component-based methodology and design environment for application-specific multicore SoC architectures. Component-based design provides primitives to build complex...
Multiprocessor SoC platforms: a component-based design approach (2002)
Cesario, W., Lyonnard, D., Nicolescu, G., Paviot, Y., Yoo, S., Jerraya, A.A., ...
A high-level, component-based methodology and design environment for multiprocessor SoC architectures reduces design time without significant efficiency loss in the final circuit. This design...
Validation in a component-based design flow for multicore SoCs (2002)
Nicolescu, G., Yoo, S., Bouchhima, A., Jerraya, A.A.
Currently, since many SoCs include heterogeneous components such as CPUs, DSPs, ASICs, memories, buses, etc., system integration becomes a major step in the design flow. To enable this integration,...
Timed HW-SW cosimulation using native execution of OS and application SW (2002)
Bacivarov, I., Yoo, S., Jerraya, A.A.
We present a method of timed HW-SW cosimulation which uses native execution of OS and application SW. The method presents fast and accurate cosimulation. Since the OS and application SW are executed...
Application of multi-domain and multi-language cosimulation to an optical MEM switch design (2002)
Nicolescu, G., Martinez, S., Kriaa, L., Youssef, W., Yoo, S., Charlot, B., ...
This paper addresses the applicability of a cosimulation methodology to multi-domain and multilanguage systems design. This methodology starts with a system model given as a netlist of heterogeneous...
Yoo, S., Oh, K.J., Zeng, Xiao Cheng
Gibbs free energy of ij-cluster formation ΔGij is obtained via the relation nij=Ne-ΔGij /kBT, where N is the number of molecules in the system, T is temperature, and kB is the Boltzmann constant....
Gerin, P., Yoo, S., Nicolescu, G., Jerraya, A.A.
In this paper, we present a cosimulation environment that provides modularity, scalability, and flexibility in cosimulation of SoC designs with heterogeneous multi-processor target architectures. Our...
A generic wrapper architecture for multi-processor SoC cosimulation and design (2001)
Yoo, S., Nicolescu, G., Lyonnard, D., Baghdadi, A., Jerraya, A.A.
In communication refinement with multiple communication protocols and abstraction levels, the system specification is described by heterogeneous components in terms of communication protocols and...
Gauthier, L., Yoo, S., Jerraya, A.A.
We propose a method of automatic generation of application specific operating systems (OS's) and automatic targeting of application software. OS generation starts from a very small bur yet flexible...
Mixed-level cosimulation for fine gradual refinement of communication in SoC design (2001)
Nicolescu, G., Yoo, S., Jerraya, A.A.
In this paper we propose a method of mixed-level cosimulation that enables gradual refinement of SoC communication from protocol-neutral communication to protocol-fixed communication. For fine...
Lyonnard, D., Yoo, S., Baghdadi, A., Jerraya, A.A.
We present a design flow for the generation of application-specific multiprocessor architectures. In the flow, architectural parameters are first extracted from a high-level system specification....
Gauthier, L., Yoo, S., Jerraya, A.A.
Software (SW) parts become crucial in embedded systems. Operating systems (OSs) are often used to handle SW concurrency and communication. We propose a method of automatic generation of...
Fast timed cosimulation of HW/SW implementation of embedded multiprocessor SoC communication (2001)
Yoo, S., Nicolescu, G., Gauthier, L., Jerraya, A.A.
To fast evaluate HW/SW implementation of multiprocessor SoC communication, we present a method to simulate operating systems (OSs) on a simulation host without running instruction set simulators and...
Interaction of Ku protein and DNA-dependent protein kinase catalytic subunit with nucleic acids.
The Ku protein-DNA-dependent protein kinase system is one of the major pathways by which cells of higher eukaryotes respond to double-strand DNA breaks. The components of the system are...
Ku protein and the DNA-dependent protein kinase catalytic subunit (DNA-PKcs) are essential components of the double-strand break repair machinery in higher eukaryotic cells. Ku protein binds to...
An in vitro transcription system based on cytidine-free cassette was developed for the late 39k gene and the very late polyhedrin gene of Autographa californica nuclear polyhedrosis virus (AcNPV)....
Interaction of Ku protein and DNA-dependent protein kinase catalytic subunit with nucleic acids.
The Ku protein-DNA-dependent protein kinase system is one of the major pathways by which cells of higher eukaryotes respond to double-strand DNA breaks. The components of the system are...
Ku protein and the DNA-dependent protein kinase catalytic subunit (DNA-PKcs) are essential components of the double-strand break repair machinery in higher eukaryotic cells. Ku protein binds to...
An in vitro transcription system based on cytidine-free cassette was developed for the late 39k gene and the very late polyhedrin gene of Autographa californica nuclear polyhedrosis virus (AcNPV)....
Vajdos, F. F., Yoo, S., Houseweart, M., Sundquist, W. I., Hill, C. P.
The cellular protein, cyclophilin A (CypA), is incorporated into the virion of the type 1 human immunodeficiency virus (HIV-1) via a direct interaction with the capsid domain of the viral Gag...
INTERNATIONAL BUSINESS CYCLES.
AHMED, S., ICKES, B., WANG, P., YOO, S.
business cycles ; financial market ; monetary policy