Showing papers by "Hyun-Chul Kim published in 2003"
TL;DR: In this paper, the authors observed a narrow state near 2.32 GeV/c(2) in the inclusive D(+)(s)pi(0) invariant mass distribution from e(+)e(-) annihilation data at energies near 10.6 GeV.
Abstract: We have observed a narrow state near 2.32 GeV/c(2) in the inclusive D(+)(s)pi(0) invariant mass distribution from e(+)e(-) annihilation data at energies near 10.6 GeV. The observed width is consistent with the experimental resolution. The small intrinsic width and the quantum numbers of the final state indicate that the decay violates isospin conservation. The state has natural spin-parity and the low mass suggests a J(P)=0(+) assignment. The data sample corresponds to an integrated luminosity of 91 fb(-1) recorded by the BABAR detector at the SLAC PEP-II asymmetric-energy e(+)e(-) storage ring.
497 citations
01 Mar 2003-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The PHENIX detector as mentioned in this paper is designed to perform a broad study of A-A, p-A and p-p collisions to investigate nuclear matter under extreme conditions, and is used to study systematic variations with species and energy as well as to measure the spin structure of the nucleon.
Abstract: The PHENIX detector is designed to perform a broad study of A-A, p-A, and p-p collisions to investigate nuclear matter under extreme conditions A wide variety of probes, sensitive to all timescales, are used to study systematic variations with species and energy as well as to measure the spin structure of the nucleon Designing for the needs of the heavy-ion and polarized-proton programs has produced a detector with unparalleled capabilities PHENIX measures electron and muon pairs, photons, and hadrons with excellent energy and momentum resolution The detector consists of a large number of subsystems that are discussed in other papers in this volume The overall design parameters of the detector are presented (C) 2002 Elsevier Science BV All rights reserved
447 citations
TL;DR: The proposed current controller has been analyzed, and the experimental results are shown to prove the feasibility and effectiveness of the proposed predictive current controller using a prototype 750 W PMSM servo drive system.
Abstract: In this paper, a new predictive current controller for a permanent magnet synchronous motor (PMSM) considering delays is presented. In a full digital current control system for a PMSM, there are inevitable delays in calculating and applying the inverter output voltages to the motor terminals. A predictive current controller implemented in a full digital system has serious problems such as the oscillation and large overshoot. A discussion of compensation methods to cope with the nonlinearities of the real system is also presented. The proposed current controller has been analyzed, and the experimental results are shown to prove the feasibility and effectiveness of the proposed predictive current controller using a prototype 750 W PMSM servo drive system.
285 citations
TL;DR: In this paper, a new on-line dead-time compensation method for a permanent magnet (PM) synchronous motor drive is proposed using a simple disturbance observer without any additional circuit and off-line experimental measurement, disturbance voltages in the rotor reference dq frame caused by the dead time and nonideal switching characteristics of power devices are estimated in an online manner and fed to voltage references.
Abstract: A new on-line dead-time compensation method for a permanent magnet (PM) synchronous motor drive is proposed. Using a simple disturbance observer without any additional circuit and off-line experimental measurement, disturbance voltages in the rotor reference dq frame caused by the dead time and nonideal switching characteristics of power devices are estimated in an on-line manner and fed to voltage references in order to compensate the dead-time effects. The proposed method is applied to a PM synchronous motor drive system and implemented by using software of a digital signal processor (DSP) TMS320C31. Simulations and experiments are carried out for this system and the results well demonstrate the effectiveness of the proposed method.
222 citations
TL;DR: Evidence is presented that neurotoxicity of soluble oligomeric Aβ closely corresponds to the selective neurodegeneration so distinctly manifest in AD, and a new opportunity for the development of an effective AD therapy as well as elucidating the pathological mechanism of AD.
Abstract: The prevailing amyloid hypothesis for Alzheimer's disease (AD) holds that amyloid beta-protein (Abeta) causes neuronal degeneration by forming neurotoxic fibrillar structures. Yet, many aspects of AD pathology and symptoms are not well explained by this hypothesis. Here, we present evidence that neurotoxicity of soluble oligomeric Abeta closely corresponds to the selective neurodegeneration so distinctly manifest in AD. Selectivity was first observed in vitro, where only the human central nervous system neuronal cells were susceptible to soluble oligomeric Abeta. Furthermore, in mouse cerebral slice treated with soluble oligomeric Abeta, selective regiospecific toxicity was evident in the hippocampal CA1, a division important for memory, but not in the CA3 subfield. The fibrillar Abeta, however, killed neurons in all regions of the cerebral slice cultures and also in cerebellar slices. Remarkably, even at the highest soluble oligomeric Abeta concentrations, cerebellar neurons were completely spared, consistent with one of the hallmark features of AD pathology. Our observation of the selective neurodegeneration of soluble oligomeric Abeta to neurons involved in cognitive function may provide a new opportunity for the development of an effective AD therapy as well as elucidating the pathological mechanism of AD.
212 citations
TL;DR: An on-line dead-time compensation method based on a time delay control for a pulse-modulation synchronous motor drive is presented and the experimental results show the effectiveness of the proposed method.
Abstract: In this work, an on-line dead-time compensation method based on a time delay control for a pulse-modulation (PM) synchronous motor drive is presented. Disturbance voltages caused by the dead time are estimated on-line without any additional circuits nor off-line experimental measurements. The estimated disturbance voltages are fed back to the voltage reference as compensation. The proposed method is applied to a PM synchronous motor drive system and implemented using a DSP TMS320C31. The experimental results show the effectiveness of the proposed method.
118 citations
University of Bologna1, University of Pisa2, University of Naples Federico II3, California Institute of Technology4, University of Bari5, University of Salento6, Indiana University7, University of L'Aquila8, INAF9, University of Trieste10, Boston University11, University of Michigan12, Massachusetts Institute of Technology13, Sapienza University of Rome14, University of Calabria15, Drexel University16, University of Turin17, University of Basilicata18, University of Eastern Piedmont19, Texas A&M University20
TL;DR: In this article, the energy of atmospheric neutrinos detected by MACRO was estimated using multiple Coulomb scattering of upward throughgoing muons, relying on the distortion of the muon energy distribution.
91 citations
TL;DR: In this article, a colloidal suspension of nanoparticles of the conjugated organic molecule tetracene is made by injecting a small amount of concentrated tetracenes/tetrahydrofuran solution into water.
Abstract: A colloidal suspension of nanoparticles of the conjugated organic molecule tetracene is made by injecting a small amount of concentrated tetracene/tetrahydrofuran solution into water. The resulting nanoparticles are characterized by atomic force microscopy, their optical absorption and emission spectra, and their fluorescence decay times and quantum yields. Their optical properties in room-temperature aqueous solution are similar to what is observed for bulk polycrystalline films of tetracene, indicating a substantial amount of crystallinity. Due to their high surface area, these organic semiconductor nanoparticles demonstrate photocatalytic activity toward several different organic dye molecules in aqueous solution. The kinetics and oxygen dependence of the reactions are consistent with a heterogeneous type I reaction, similar to what is observed for other semiconductor photocatalysts, and the quantum yields at high surface coverage and low light intensity are comparable to those of inorganic photocatalysts.
83 citations
01 Oct 2003
TL;DR: A new memory architecture is presented in which incorporates NAND flash memory into an existing memory hierarchy for code execution and the usefulness of the proposed approach is demonstrated with real embedded workloads on a real prototyping board.
Abstract: NAND flash memory has become an indispensable component in mobile embedded systems because of its versatile features such as nonvolatility, solid-state reliability, low cost and high density. Even though NAND flash memory is gaining popularity as data storage, it can be also exploited as code memory for XIP (execute-in-place). In this paper, we present a new memory architecture in which incorporates NAND flash memory into an existing memory hierarchy for code execution. The usefulness of the proposed approach is demonstrated with real embedded workloads on a real prototyping board.
81 citations
TL;DR: With a sample of approximately 89 x 10(6) B(-)B pairs collected with the BABAR detector, a search for B meson decays into pairs of charmless vector mesons (phi, rho, and K*) is performed.
Abstract: With a sample of approximately 89 million B{bar B} pairs collected with the BABAR detector, they measure branching fractions, determine the degree of longitudinal polarization, and search for direct CP violation in the decays B{sup 0} {yields} {psi}K*{sup 0} and B{sup +} {yields} {psi}K*{sup +}. They perform a search for other charmless vector-vector B decays involving {rho} and K*(892) resonances and observe the decays B{sup +} {yields} {rho}{sup 0} K*{sup +} and B{sup +} {yields} {rho}{sup 0}{rho}{sup +}. The branching fractions are measured to be {Beta}({phi}K*{sup 0}) = (11.1 {sub -1.2}{sup +1.3} {+-} 1.1) x 10{sup -6}, {Beta}({phi}K*{sup +}) = (12.1 {sub -1.9}{sup +2.1} {+-} 1.5) x 10{sup -6}, {Beta}({rho}{sup 0} K*{sup +}) = (7.7{sub -2.0}{sup +2.1} {+-} 1.4) x 10{sup -6}, and {Beta}({rho}{sup 0} {rho}{sup +}) = 0.65 {+-} 0.07 {+-} 0.04 and {Lambda}{sub L}/{Lambda}({phi}K*{sup +}) = 0.46 {+-} 0.12 {+-} 0.05. They measure the charge asymmetries: {Alpha}{sub CP}({phi}K*{sup 0}) = +0.04 {+-} 0.12 {+-} 0.02 and {Alpha}{sub CP}({phi}K*{sup +}) = +0.16 {+-} 0.17 {+-} 0.04.
81 citations
TL;DR: In this article, the authors presented evidence for the flavor-changing neutral current decay B-->K-*.(-) and a measurement of the branching fraction for the related process B-->k.(+).(+).(+) is either an e(+)e(-) or a mu(+)mu(-) pair.
Abstract: We present evidence for the flavor-changing neutral current decay B-->K-*.(+).(-) and a measurement of the branching fraction for the related process B-->K.(+).(-), where .(+).(-) is either an e(+)e(-) or a mu(+)mu(-) pair. These decays are highly suppressed in the standard model, and they are sensitive to contributions from new particles in the intermediate state. The data sample comprises 123x10(6) Y(4S)-->B (B) over bar decays collected with the BABAR detector at the SLAC PEP-II e(+)e(-) storage ring. Averaging over K-(*) isospin and lepton flavor, we obtain the branching fractions B(B-->Kl(+)l(-))=(0.65(-0.13)(+0.14)+/-0.04)x10(-6) and B(B-->K(*)l(+)l(-))=(0.88(-0.29)(+0.33)+/-0.10)x10(-6), where the uncertainties are statistical and systematic, respectively. The significance of the B-->Kl(+)l(-) signal is over 8sigma, while for B-->K(*)l(+)l(-) it is 3.3sigma.
TL;DR: In this article, the authors analyzed 44.3M single muons collected by MACRO from 1991 through 2000 in 2145 live days of operation and found evidence for statistically significant modulations with the solar diurnal and the sidereal periods.
Abstract: We have analyzed 44.3M single muons collected by MACRO from 1991 through 2000 in 2145 live days of operation. We have searched for the solar diurnal, apparent sidereal, and pseudosidereal modulation of the underground muon rate by computing hourly deviations of the muon rate from 6 month averages. We find evidence for statistically significant modulations with the solar diurnal and the sidereal periods. The amplitudes of these modulations are <0.1%, and are at the limit of the detector statistics. The pseudosidereal modulation is not statistically significant. The solar diurnal modulation is due to the daily atmospheric temperature variations at 20 km, the altitude of primary cosmic ray interactions with the atmosphere; MACRO is the deepest experiment to report this result. The sidereal modulation is in addition to the expected Compton-Getting modulation due to solar system motion relative to the local standard of rest; it represents motion of the solar system with respect to the galactic cosmic rays toward the galactic plane.
University of Naples Federico II1, University of Pisa2, California Institute of Technology3, University of Bologna4, University of Bari5, University of Salento6, Indiana University7, Roma Tre University8, University of L'Aquila9, University of Trieste10, Boston University11, University of Michigan12, Sapienza University of Rome13, Massachusetts Institute of Technology14, University of Calabria15, Drexel University16, Macalester College17, University of Turin18, University of Basilicata19, University of Eastern Piedmont20, Texas A&M University21
TL;DR: In this paper, a transition radiation detector composed of three identical modules, covering a total horizontal area of 36 m2, was installed inside the empty upper part of the detector in order to measure the residual energy of muons.
Journal Article•
TL;DR: In this paper, the authors determined whether alterations of plasma and urinary VEGF levels were related to diabetic microvascular complications, especially nephropathy in type 2 diabetic patients.
Abstract: Background: VEGF(vascular endothelial growth factor) has been implicated in the pathogenesis of neovascularization and endothelial dysfunction in diabetes mellitus. However, its precise role in diabetic nephropathy is still unknown. Our aims were to determine whether alterations of plasma and urinary VEGF levels were related to diabetic microvascular complications, especially nephropathy in type 2 diabetic patients. Methods: 107 type 2 diabetic patients, without non-diabetic kidney diseases, and 47 healthy control subjects were studied. The urinary albumin excretion was defined as the albumin-to-creatinine ratio(ACR) in 24 hour urine samples. The study subjects were divided into four groups: a nondiabetic healthy control group(n=47), a normoalbuminuric diabetic group(ACR /mg, n=37), a microalbuminuric diabetic group(ACR 30-299/mg, n=37) and an overt proteinuric diabetic group(ACR=300/mg, n=33). The plasma and urinary VEGF levels were measured in these subjects by enzyme-linked immunosorbent assays. Results: 1) The urinary VEGF concentrations were significantly higher in the diabetic groups than in the controls, even in the normoalbuminuric stage(log VEGF/Cr, normoalbuminuria; 4.331.06 vs. control; 3.530.79, p=0.009). The levels of urinary VEGF excretions increased with advancing diabetic nephropathy stage. 2) The plasma and urinary VEGF levels were higher in the hypertensive diabetic than the normotensive diabetic patients. 3) In the diabetic patients, the level of plasma VEGF was positively correlated with the BUN(r=0.398, p=0.039) and urinary ACR (r=0.251, p=0.044). The level of urinary VEGF was positively correlated with the urinary ACR(r=0.645, p
TL;DR: In this paper, an upper bound on the flux of upward-going muons from high-energy neutrinos was set at the level of 1.7×10−14 cm−2−s−1−sr−1.
TL;DR: In this paper, the influence of annealing on grain growth at two different temperatures of 100 and 200 °C for 10min in vacuum was investigated using SEM and XRD analysis.
University of Naples Federico II1, University of Pisa2, California Institute of Technology3, University of Bologna4, University of Bari5, University of Salento6, Indiana University7, Roma Tre University8, University of L'Aquila9, University of Michigan10, University of Trieste11, Boston University12, Massachusetts Institute of Technology13, Sapienza University of Rome14, University of Calabria15, Drexel University16, Macalester College17, University of Turin18, University of Basilicata19, University of Eastern Piedmont20, Texas A&M University21
TL;DR: In this article, the authors studied the shadowing effects due to both the Moon and the Sun on the underground muon flux and found that the Moon shadow, observed with a significance of 4.6 σ is displaced by about 0.6° from its apparent position.
TL;DR: In this article, the branching fractions of the decays of B++eta'K+ and B0-->eta'k0 were measured and the time-dependent CP-violation parameters were measured.
Abstract: We present measurements of the branching fractions of the decays B+-->eta'K+ and B0-->eta'K0. For B0-->eta(')K(0)(S) we also measure the time-dependent CP-violation parameters S eta'(K(0)(S)) and C eta'(K(0)(S)), and for B+-->eta'K+ the time-integrated charge asymmetry A(ch). The data sample corresponds to 88.9 x 10(6) BB pairs produced by e(+)e(-) annihilation at the Upsilon(4S). The results are B(B+-->eta'K+)=(76.9+/-3.5+/-4.4) x 10(-6), B(B0-->eta'K0)=(60.6+/-5.6+/-4.6) x 10(-6), S eta'(K(0)(S))=0.02+/-0.34+/-0.03, C eta'(K(0)(S))=0.10+/-0.22+/-0.04, and A(ch)=0.037+/-0.045+/-0.011.
TL;DR: In this article, a measurement of branching fractions and CP-violating asymmetries in B0→ρ±πplusmn; and ρ-K+ decays is presented.
Abstract: Measurements of branching fractions and CP-violating asymmetries in B0→ρ±πplusmn; and ρ-K+ decays are presented. As such, no evidence is found for either mixing-induced CP violation in the time-dependent asymmetry of B0→ρ±π± decays, or direct CP violation in B0→ρ-K+. The measurement of direct CP violation is found to be consistent with zero within 2.0 standard deviations, when both statistical and systematic errors are taken into account.
TL;DR: In this paper, the fraction of J/ψ produced via radiative χc decays in interactions of 920-GeV protons with carbon and titanium targets was measured.
TL;DR: In this paper, the branching fractions and charge asymmetries in B+/--->h(+/-)pi(0) (where h (+/-)=pi( +/-),K+/-),
Abstract: We present results for the branching fractions and charge asymmetries in B+/--->h(+/-)pi(0) (where h(+/-)=pi(+/-),K+/-) and a search for the decay B0-->pi(0)pi(0) using a sample of approximately 88 x 10(6) BBmacr; pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure B(B+/--->pi(+/-)pi(0))=(5.5(+1.0)(-0.9)+/-0.6)x10(-6), where the first error is statistical and the second is systematic. The B+/--->pi(+/-)pi(0) signal has a significance of 7.7sigma including systematic uncertainties. We simultaneously measure the K+/-pi(0) branching fraction to be B(B+/--->K+/-pi(0))=(12.8(+1.2)(-1.1)+/-1.0)x10(-6). The charge asymmetries are Api(+/-)(pi(0))=-0.03(+0.18)(-0.17)+/-0.02 and AK+/-(pi(0))=-0.09+/-0.09+/-0.01. We place a 90% confidence-level upper limit on the branching fraction B(B0-->pi(0)pi(0)) of 3.6 x 10(-6).
TL;DR: The efficacy and safety of sildenafil in this population of Korean men appears similar to that reported in other studies in western populations.
Abstract: The efficacy and safety of sildenafil was evaluated in a randomiSed, double-blind, placebo-controlled, flexible-dose study in Korean men aged 28-78 y with erectile dysfunction (ED) of broad-spectrum aetiology and more than 6 months duration. A total of 133 patients were randomised at six centres in Korea to receive either sildenafil (50 mg initially, increased if necessary to l00 mg or decreased to 25 mg depending on efficacy and tolerance) (n=66) or matching placebo (n=67) taken on an 'as needed' basis l h prior to anticipated sexual activity for a period of 8 weeks. At the end of this time, the primary efficacy variables relating to the achievement and maintenance of erections sufficient for sexual intercourse, and the secondary efficacy variables, which included: (1) the five separate domains of sexual functioning of the International Index of Erectile Function (IIEF) scale, (2) the percentage of successful intercourse attempts, and (3) a global assessment of erections, were all statistically significantly improved by sildenafil in comparison with placebo (P&<0.0001). Treatment-related adverse events occurred in 56.1% of patients receiving sildenafil and 20.9% receiving placebo. The most common adverse events with sildenafil were vasodilatation (flushing), headache and abnormalities in colour vision (31.8, 22.7 and 6.1% of patients, respectively), and most were mild in nature. The efficacy and safety of sildenafil in this population of Korean men appears similar to that reported in other studies in western populations.
TL;DR: In this paper, the results of a search for D0-D(-)0 mixing and a measurement of R(D), the ratio of doubly Cabibbo-suppressed decays to Cabiba-favored decays, using D0-->K+pi-decays from 57.1 fb(-1) of data collected near sqrt[s]=10.6 GeV with the BABAR detector at the PEP-II collider.
Abstract: We present results of a search for D0-D(-)0 mixing and a measurement of R(D), the ratio of doubly Cabibbo-suppressed decays to Cabibbo-favored decays, using D0-->K+pi- decays from 57.1 fb(-1) of data collected near sqrt[s]=10.6 GeV with the BABAR detector at the PEP-II collider. At the 95% confidence level, allowing for CP violation, we find the mixing parameters x('2)<0.0022 and -0.056
TL;DR: In this article, a measurement of D0-macro D0 mixing parameters using the ratios of lifetimes extracted from samples of D 0 mesons decaying to K-pi(+), K-K+, and pi(-)pi(+) was presented.
Abstract: We present a measurement of D0-macro D0 mixing parameters using the ratios of lifetimes extracted from samples of D0 mesons decaying to K-pi(+), K-K+, and pi(-)pi(+). Using 91 fb(-1) of data collected by the BABAR detector at the PEP-II asymmetric-energy B Factory, we obtain a value Y=[0.8+/-0.4(stat.)(+0.5)(-0.4)(syst.)]%, which, in the limit of CP conservation, corresponds to the mixing parameter y=Delta Gamma/2 Gamma. Using the difference in lifetimes of D0 and macro D0 mesons, we obtain the CP-violation parameter Delta Y=[-0.8+/-0.6(stat.)+/-0.2(syst.)]%.
TL;DR: A study of the decay B0-->pi(0)pi( 0) based on a sample of 124 x 10(6) BB pairs recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, finding 46+/-13+/-3 events.
Abstract: We present a study of the decay B0 -> p0p0 based on a sample of 124 * 106 B.hivin.B pairs recorded by the BABAR detector at the PEP-II asym.-energy B Factory at SLAC. We observe 46 +- 13 +- 3 events, where the first error is statistical and the second is systematic, corresponding to a significance of 4.2 std. deviations including systematic uncertainties. We measure the branching fraction B(B0 -> p0p0) = (2.1 +- 0.6 +- 0.3) * 10-6, averaged over B0 and .hivin.B0 decays. [on SciFinder (R)]
TL;DR: In this paper, the HERA-B detector was used to measure the production cross-section of the $b\overline{b}$¯¯ production cross section in 920 GeV proton collisions on carbon and titanium targets, where the bottom quark decays into $J/\psi$¯¯ by exploiting the longitudinal separation of vertices from the primary proton-nucleus interaction.
Abstract: Using the HERA - B detector, the $b\overline{b}$
production cross section has been measured in 920 GeV proton collisions on carbon and titanium targets. The $b\overline{b}$
production was tagged via inclusive bottom quark decays into $J/\psi$
by exploiting the longitudinal separation of $J/\psi\to l^+l^-$
decay vertices from the primary proton-nucleus interaction. Both e
+
e
-
and $\mu^+\mu^-$
channels have been reconstructed and the combined analysis yields the cross section $\sigma(b\overline{b}) = 32 ^{+14} _{-12} (stat) ^{+6} _{-7} (sys) nb/nucleon$
.
TL;DR: In this article, the qualitative relationship between etch rate and inductive power and d.c. bias voltage was studied to obtain high sapphire etch performance in an inductively coupled plasma etcher using BCl 3 /HBr/Ar plasmas.
Abstract: The etching of (0 0 0 1) sapphire wafer was studied in an inductively coupled plasma etcher using BCl 3 /HBr/Ar plasmas. The qualitative relationship between etch rate and inductive power and d.c. bias voltage was studied to obtain high sapphire etch rate. The etch rate was increased almost linearly with the increase of inductive power and d.c. bias voltage. The etch selectivity over photoresist was remained similar for the investigated range of inductive power and d.c. bias voltage except for the low d.c. bias voltages. At the low d.c. bias voltages, the increase of d.c. bias voltage increased the etch selectivity. The highest sapphire etch rate obtained in BCl 3 /HBr/Ar plasma was 550 nm/min with the etch selectivity over photoresist approximately 0.87 at 1400 W of inductive power and −800 V of d.c. bias voltage. In the etch conditions with the d.c. bias voltage over −600 V, the highly anisotropic sapphire etch profile and the sapphire surface composition similar to non-etched sapphire wafer (reference) could be obtained when observed by a scanning electron microscope and X-ray photoelectron spectroscopy, respectively. The surface roughness of the etched sapphire wafer was examined by atomic force microscopy and was remained similar regardless of d.c. bias voltage.
TL;DR: In this paper, the authors measured differential cross sections for the production of K-S(0), Lambda, and (U) over bar particles at HERA in proton-induced reactions on C, Al, Ti, and W targets.
Abstract: Inclusive differential cross sections dsigma(pA)/dx(F) and dsigma(pA)/dp(t)(2) for the production of K-S(0), Lambda, and (U) over bar particles are measured at HERA in proton-induced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to roots = 41.6 GeV in the proton-nucleon system. The ratios of differential cross sections dsigma(pA)(K-S(0))/dsigma(pA)(Lambda) and dsigma(pA)((U) over bar)/dsigma(pA) (Lambda) are measured to be 6.2 +/- 0.5 and 0.66 +/- 0.07, respectively, for x(F) approximate to -0.06. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions da,Ald t also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections sigma(pA) on the atomic mass A of the target material is discussed, and the deduced cross sections per nucleon sigma(pN) are compared with results obtained at other energies.
TL;DR: It is anticipated that this local light-adaptive CMOS retina chip could find applications in the area of active vision systems for target tracking and recognition.
Abstract: A foveated-structure CMOS retina chip for edge detection with local light adaptation is presented. The functions of photoreceptors, horizontal cells, and bipolar cells in the human retina are transformed to a simple equivalent circuit for detecting the edge of an input image. The unit pixel of the chip consists of only four MOSFETs and two photo-transistors. A 32×32 foveated-structure local light-adaptive retina chip for edge detection has been designed and fabricated using 0.6 μm double-poly triple-metal CMOS process. The fabricated retina chip measures 8 mm ×8 mm and could detect the edges of an input image with a wide range of light intensity. It is anticipated that this local light-adaptive CMOS retina chip could find applications in the area of active vision systems for target tracking and recognition.
TL;DR: In this paper, the authors used a sample of 82.9 million BBbar events collected between 1999 and 2002 with the babar detector at the PEP-II storage ring at the Stanford Linear Accelerator Center.
Abstract: We report the observation of 823+/-57 B^0 and 970+/-65 B^+ decays to doubly charmed final states Dbar^(*)D^(*)K, where Dbar^(*) and D^(*) are fully reconstructed and K is either a K+/- or a K^0. We use a sample of 82.3+/- 0.9 million BBbar events collected between 1999 and 2002 with the babar detector at the PEP-II storage ring at the Stanford Linear Accelerator Center. The 22 possible B decays to Dbar^(*)D^(*)K are reconstructed exclusively and the corresponding branching fractions or limits are determined. The branching fractions of the B^0 and of the B^+ to Dbar^(*)D^(*)K$ are found to be BR(B^0 --> Dbar^(*) D^(*) K) = (4.3 +/- 0.3 stat +/- 0.6 syst)%, BR(B^+ --> Dbar^(*) D^(*) K) = (3.5 +/- 0.3 stat +/- 0.5 syst)%. A search for decays to orbitally excited $D_s$ states, B --> Dbar^(*) D_{sJ}^{+} (D_{sJ}^{+} --> D^(*)0K^+) is also performed.