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Showing papers by "Hyun-Chul Kim published in 1994"


Journal ArticleDOI
Fumio Abe, M. G. Albrow1, D. Amidei2, J. Antos3  +395 moreInstitutions (30)
TL;DR: In this article, a photon cross section measurement from the Collider Detector at Fermilab experiment is presented, where the detector and trigger upgrades, as well as six times the integrated luminosity compared with their previous publication, have contributed to a much more precise measurement and extended [ital P][sub [ital T]] range.
Abstract: A prompt photon cross section measurement from the Collider Detector at Fermilab experiment is presented. Detector and trigger upgrades, as well as six times the integrated luminosity compared with our previous publication, have contributed to a much more precise measurement and extended [ital P][sub [ital T]] range. As before, QCD calculations agree qualitatively with the measured cross section, but the data has a steeper slope than the calculations.

66 citations


Journal ArticleDOI
TL;DR: In this article, the metal V-belt behavior of a V belt CVT was investigated analytically and experimentally, and it was found that the gross slip points depend on the torque transmission capacity of the driven side.

33 citations


Journal ArticleDOI
TL;DR: In this article, a 3.5 mm long microcolumn was used for a scanning tunneling microscope aligned field-emission source using an oxygen processed, 50 nm radius, cold 〈111〉 W field emission tip.
Abstract: Recent advances in microcolumn design and fabrication have led to a significant improvement in the resolution obtained with a new 3.5 mm long microcolumn. At an electron energy of 1 keV and 2 mm working distance, the beam diameter, measured by the signal rise‐time while scanning over a sharp edge, is 40 nm and the resolution observed in scanning transmission electron microscope images is about 30 nm. These experimental results agree well with results of the electron‐optical modeling. All lenses and apertures in the column are made from silicon membranes and assembled using a novel ultrahigh vacuum compatible, multilayer anodic bonding technique. The scanning tunneling microscope aligned field‐emission source uses an oxygen processed, 50 nm radius, cold 〈111〉 W field‐emission tip. Good emission stability for scanning electron microscope operation has been achieved with a few percent of root‐mean‐square current fluctuation over about 30 min. With periodic tip flashes, the system has been operated reliably o...

30 citations


Patent
24 Aug 1994
TL;DR: An austenitic stainless steel and a manufacturing process therefor are disclosed, in which, instead of the expensive Ni, there are added Cu as an austenite stabilizing element, and tiny amounts of Ti as a ferrite forming element and B for improvement of high temperature hot workability, so that the optimum Md30temperature and the optimum delta-ferrite content can be controlled as discussed by the authors.
Abstract: An austenitic stainless steel and a manufacturing process therefor are disclosed, in which, instead of the expensive Ni, there are added Cu as an austenite (τ) stabilizing element, and tiny amounts of Ti as a ferrite forming element and B for improvement of high temperature hot workability, so that the optimum Md30temperature and the optimum delta-ferrite content can be controlled, thereby improving the formability, the season cracking resistance, the hot workability and the high temperature oxidation resistance, and reducing the surface defects during the hot rolling and saving the manufacturing cost by reducing the content of Ni. The austenitic stainless steel according to the present invention includes in weight %: less than 0.07 % of C, less than 1.0 % of Si, less than 2.0 % of Mn, 16-18 % of Cr, 6.0-8.0 % of Ni, less than 0.005 % of Al, less than 0.05 % of P, less than 0.005 % of S, less than 0.03 % of Ti, less than 0.003 % of B, less than 3.0 % of Cu, less than 0.3 % of Mo, less than 0.1 % of Nb, less than 0.045 % of N, the balance of Fe, and other indispensable impurities. Thus the present invention improves the press formability, the season cracking resistance, the hot workability, and the high temperature oxidation resistance.

29 citations


Journal ArticleDOI
TL;DR: A dynamical model for [ital S]- and [ital P]-wave correlated two-pion exchange between two nucleons is presented and it is demonstrated that the results have quite different characteristics compared to (sharp mass) [sigma][prime], [rho] exchange as used in the Bonn potential.
Abstract: A dynamical model for [ital S]- and [ital P]-wave correlated two-pion exchange between two nucleons is presented, starting from corresponding [ital N[bar N]][r arrow][pi][pi] amplitudes in the pseudophysical region, which have been constructed from nucleon and [Delta]-isobar exchange Born terms and a meson exchange model of [pi][pi] scattering which satisfactorily describes the empirical [pi][pi] data. It is demonstrated that the results have quite different characteristics, in both strength and range, compared to (sharp mass) [sigma][prime], [rho] exchange as used in the Bonn potential. Consequences for the description of high partial wave [ital NN] scattering phase shifts are discussed.

21 citations


Journal ArticleDOI
S.B. Eun1, E. S. No2, Hyun-Chul Kim1, Hyunsoo Yoon1, Seungryoul Maeng1 
TL;DR: This paper investigates the properties of IMAs for recognizing the inherent interactivity and concurrency and proposes a specification method based on Milner'sCalculus of Communicating Systems (CCS), which is a well-known formal mechanism for specifying the concurrency in various distributed applications.
Abstract: Programming, testing, and maintaining interactive multimedia applications (IMAs) are still difficult and expensive, while substantial progress has been made to reduce the burden on authors. As IMAs get larger and more complex the difficulties will increase. To overcome the complexity of such IMAs, we argue that authoring systems should provide such facilities as (1) a traditional and intuitivedivide-and-conquer paradigm for solving large and complex problems in various fields, (2)formal specification of the behaviors of IMAs for checking the syntactic correctness of visual expressions or semantic anomalies, and (3)automatic aids like validation of temporal constraints and verification of visual expressions. In this paper, we investigate the properties of IMAs for recognizing the inherent interactivity and concurrency. We propose a specification method based on Milner'sCalculus of Communicating Systems (CCS), which is a well-known formal mechanism for specifying the concurrency in various distributed applications. We also design and implement an authoring system calledEventor (Event Editor), which is based on CCS and composed of three tools: a Temporal Synchronizer, a Spatial Synchronizer, and a User Interaction Builder. They focus on describing the temporal and spatial synchronizations and user interactions while they rely on existing tools in Intel's Digital Video Interactive (DVI) for supporting other functionalities. By editing a simple computer aided instruction (CAI) application, we illustrate that our specification mechanism is well-suited for handling the interactivity of multimedia applications, and Eventor is a simple, efficient, and powerful enough tool to handle practical applications. Especially the incremental refinement and the formal specification based on the CCS allow Eventor to be extended with formal verifications to cope with large and complex applications.

20 citations


Journal ArticleDOI
TL;DR: In this paper, the effects of microstructural evolution during isothermal annealing on structure-sensitive magnetic properties and Barkhausen noise (BN) characteristics have been investigated for 12% CrMoV steel.

20 citations


Journal ArticleDOI
Fumio Abe, M. G. Albrow1, D. Amidei2, C. Anway-Wiese3  +388 moreInstitutions (31)
TL;DR: In this article, the authors measured the branching ratio of the collision data from the 1992-1993 run of the Collider Detector at Fermilab and derived a branching ratio for the top quark mass.
Abstract: We present a measurement of the ratio $\frac{\ensuremath{\sigma}B(W\ensuremath{\rightarrow}e\ensuremath{ u})}{\ensuremath{\sigma}B({Z}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})}$ in $\overline{p}p$ collisions at $\sqrt{s}=1.8$ TeV The data represent an integrated luminosity of 21.7 ${\mathrm{pb}}^{\ensuremath{-}1}$ from the 1992-1993 run of the Collider Detector at Fermilab. We find $\frac{\ensuremath{\sigma}B(W\ensuremath{\rightarrow}e\ensuremath{ u})}{\ensuremath{\sigma}B({Z}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})}=10.90\ifmmode\pm\else\textpm\fi{}0.32(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.29(\mathrm{syst})$. From this value, we extract a value for the $W$ width, $\ensuremath{\Gamma}(W)=2.064\ifmmode\pm\else\textpm\fi{}0.061(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.059(\mathrm{syst})$ GeV, and the branching ratio, $\frac{\ensuremath{\Gamma}(W\ensuremath{\rightarrow}e\ensuremath{ u})}{\ensuremath{\Gamma}(W)=0.1094\ifmmode\pm\else\textpm\fi{}0.0033(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0031(\mathrm{syst})}$, and we set a decay-mode-independent limit on the top quark mass ${m}_{\mathrm{top}}g62$ GeV/${\mathit{c}}^{2}$ at the 95% C.L.

16 citations


Journal ArticleDOI
TL;DR: Schottky emission tips have been evaluated with microlenses for applications in scanning tunneling microscope aligned field emission microcolumns as discussed by the authors, and preliminary results show that thermal field emission tips can be operated continuously in close proximity to a microlens over a long period of time, and that good emission stability is achieved with emission currents up to at least 100 μA.
Abstract: Schottky emission tips have been evaluated with microlenses for applications in scanning tunneling microscope aligned field emission microcolumns. Operation of Zr/O/W 〈100〉 Schottky emission tips at 1800 K with an axial separation of 50–100 μm between the tip and a microlens has been successfully tested. The microlens consists of an extraction electrode with a 5‐μm‐diam hole in a 1‐μm‐thick silicon membrane. The preliminary results of this study show that thermal field emission tips can be operated continuously in close proximity to a microlens over a long period of time, and that good emission stability of less than 1% noise fluctuation over 10 h is achieved with emission currents up to at least 100 μA.

14 citations


Journal ArticleDOI
TL;DR: In this paper, the difference between the average charged multiplicity of [ital Z][sup 0][r arrow][ital b[bar b] and [italZ][s 0][ r arrow] hadrons was measured to be 2.24 and 0.33, respectively.
Abstract: Using an impact parameter tag to select an enriched sample of [ital Z][sup 0][r arrow][ital b[bar b]] events, we have measured the difference between the average charged multiplicity of [ital Z][sup 0][r arrow][ital b[bar b]] and [ital Z][sup 0][r arrow] hadrons to be [ital [bar n]][sub [ital b]][minus][ital [bar n]][sub had]=2.24[plus minus]0.30 ( stat )[plus minus]0.33 ( syst ) tracks per event. From this, we have derived [ital [bar n]][sub [ital b]][minus][ital [bar n]][sub [ital u][ital d][ital s]]=3.31[plus minus]0.41[plus minus]0.79. Comparing this measurement with those at lower center-of-mass energies, we find no evidence that [ital [bar n]][sub [ital b]][minus][ital [bar n]][sub [ital u][ital d][ital s]] depends on energy. This result is in agreement with a precise prediction of perturbative QCD, and supports the notion that QCD remains asymptotically free down to the scale [ital M][sub [ital b]][sup 2].

14 citations


Journal ArticleDOI
Fumio Abe, M. G. Albrow1, D. Amidei2, J. Antos3  +406 moreInstitutions (32)
TL;DR: In this article, the results of a search in [ital [bar p] [ital p] collisions at [radical][ital s] = 1.8 TeV for the top quark decaying to a charged Higgs bosson ([ital H][sup [plus minus]]).
Abstract: We present the results of a search in [ital [bar p]] [ital p] collisions at [radical][ital s] =1.8 TeV for the top quark decaying to a charged Higgs bosson ([ital H][sup [plus minus]]). We search for dilepton final states from the decay chain [ital t] [ital [bar t]][r arrow][ital HH] (or [ital HW], or [ital WW])+[ital b] [ital [bar b]][r arrow][ital ll]+[ital X]. In a sample of 19.3 pb[sup [minus]1] collected during 1992--93 with the Collider Detector at Fermilab, we observe 2 events with a background estimation of 3.0[plus minus]1.0 events. Limits at 95% C.L. in the (M[sub top],M[sub [ital H][sup [plus minus]]]) plane are presented. For the case [ital M][sub top][lt][ital M][sub [ital W]]+[ital M][sub [ital b]], we exclude at 95% C.L. the entire ([ital M][sub top],[ital M][sub H[plus minus]]) plane for the branching ratio [ital B]([ital H][r arrow][tau][nu]) larger than 75%. We also interpret the results in terms of the parameter tan[beta] of two-Higgs-doublet models.

Patent
22 Dec 1994
TL;DR: An electron gun for a large-sized color cathode ray tube has three cathodes heated by a heater for emitting thermoelectrons, and a bead glass for fixing the electrodes spaced apart by predetermined distances as discussed by the authors.
Abstract: An electron gun for a large-sized color cathode ray tube has three cathodes heated by a heater for emitting thermoelectrons, a first grid for controlling emitted electron beams on one side of the cathodes, a second grid for attracting the thermoelectrons gathered on the cathodes on one side of the first grid, a plurality of electrodes sequentially arranged on the second grid for accelerating and focusing the incoming electron beams, and a bead glass for fixing the electrodes spaced apart by predetermined distances, in which the thickness of the second grid is varied to decrease the divergence angle of the electron beams, and horizontal slits being rotary asymmetrical portions are formed in both sides around electron beam passing holes to contrive a quadrupole effect, thereby compensating for distortion of the electron beams on the periphery of a screen caused by a deflection aberration to thus improve resolution of large-sized Brawn tubes.

Journal ArticleDOI
Fumio Abe, M. G. Albrow1, D. Amidei2, J. Antos3  +408 moreInstitutions (32)
TL;DR: In this article, the authors measured the angular distribution of the [ital W]+jet angular distribution using the Collider Detector at Fermilab (CDF) during 1988--89 and 1992--93 Tevatron runs.
Abstract: The [ital W]+jet angular distribution is measured using [ital W][minus][gt][ital e][nu] events recorded with the Collider Detector at Fermilab (CDF) during 1988--89 and 1992--93 Tevatron runs. The data agree well with both a leading order and a next-to-leading order theoretical prediction. The shape of the angular distribution is similar to that observed in photon+jet data, and significantly different from that observed in dijet data.

Journal ArticleDOI
TL;DR: The RD-10/45 research and development effort on calorimeter/absorber optimization for a Relativistic Heavy Ion Collider dimuon experiment had an extended run in 1991 and 1992 at the BNL Alternating Gradient Synchrotron as discussed by the authors.
Abstract: The RD-10/45 research and development effort on calorimeter/absorber optimization for a Relativistic Heavy Ion Collider dimuon experiment had an extended run in 1991 and 1992 at the BNL Alternating Gradient Synchrotron. Measurements were made of the leakage of 1–8 GeV/ c particles behind various model hadron calorimeters. Behavior of the calorimeter/absorber as a muon-identifier was studied. Comparisons of data from the RD-10/45 experiment to results calculated with the GEANT 3.15 simulation package using the GHEISHA and FLUKA hadron shower codes were made.

Proceedings ArticleDOI
Hyun-Chul Kim1, J. Jin, C. Jeoun, Y. Choi, B. Kwon, S. Lim, K. Choi 
31 May 1994
TL;DR: In this article, a novel bipolar technology featuring the trench-isolated base is presented, which reduces both the surface leakage and current gain of the parasitic lateral pnp transistor by at least one order, which results in the improvement of the punchthrough-induced breakdown behavior by almost a factor of two.
Abstract: In this paper, we present a novel bipolar technology featuring the trench-isolated base. When employed for a conventional 2 /spl mu/m process, the trench isolation reduces both the surface leakage and current gain of the parasitic lateral pnp transistor by at least one order, which results in the improvement of the punchthrough-induced breakdown behavior by almost a factor of two. The depletion capacitance is also diminished by about 60% thanks to the decrease of the effective base-collector junction area, suggesting that the trench isolation is a viable approach even for high frequency as well as for high voltage applications.