Showing papers by "Korea University published in 1995"
TL;DR: In this article, the authors present an endogenous growth model of an open economy in which the growth rate of income is higher if foreign capital goods are used relatively more than domestic capital goods for the production of capital stock.
296 citations
TL;DR: The authors have developed a technique based on a solution of the Poisson equation to unwrap the phase in magnetic resonance (MR) phase images that is robust in the presence of noise and applies to the 3-point Dixon technique for water and fat separation.
Abstract: The authors have developed a technique based on a solution of the Poisson equation to unwrap the phase in magnetic resonance (MR) phase images. The method is based on the assumption that the magnitude of the inter-pixel phase change is less than /spl pi/ per pixel. Therefore, the authors obtain an estimate of the phase gradient by "wrapping" the gradient of the original phase image. The problem is then to obtain the absolute phase given the estimate of the phase gradient. The least-squares (LS) solution to this problem is shown to be a solution of the Poisson equation allowing the use of fast Poisson solvers. The absolute phase is then obtained by mapping the LS phase to the nearest multiple of 2 K from the measured phase. The proposed technique is evaluated using MR phase images and is proven to be robust in the presence of noise. An application of the proposed method to the 3-point Dixon technique for water and fat separation is demonstrated. >
172 citations
TL;DR: In this article, the search for the top quark in p anti-p collisions at S**(1/2) = 1.8 TeV with an integrated luminosity of 13.9.
Abstract: We present new results on the search for the top quark in p anti-p collisions at S**(1/2) = 1.8 TeV with an integrated luminosity of 13.5 +- 1.6 pb**(-1). We have considered t anti-t production in the Standard Model using electron and muon dilepton decay channels (t anti-t -> e mu + jets, e e + jets, and mu mu + jets) and single-lepton decay channels (t anti-t -> e + jets and mu + jets) with and without tagging of b quark jets. From all channels, we have 9 events with an expected background of 3.8 +- 0.9. If we assume that the excess is due to t anti-t production, and assuming a top mass of 180 GeV/c**2, we obtain a cross section of 8.2 +- 5.1 pb.
151 citations
TL;DR: In this article, a search for events consistent with the production and decay of the squarks and gluinos of the minimal supersymmetric standard model (MSSM) in the D0 detector at the Fermilab Tevatron {ital p{bar p}} collider was presented.
Abstract: We present a search for events consistent with the production and decay of the squarks and gluinos of the minimal supersymmetric standard model (MSSM) in the D0 detector at the Fermilab Tevatron {ital p{bar p}} collider. We examined data for events containing large missing transverse energy and three or more jets. We observed no excess of events above the expected yield from standard model processes. For a choice of MSSM parameter values, we set a lower limit at the 95% confidence level on the mass of the gluino of 144 GeV/{ital c}{sup 2} for all squark masses and a lower limit of 212 GeV/{ital c}{sup 2} for equal squark and gluino masses.
106 citations
TL;DR: In this article, the properties and structure of (45 - x)RO · xNa2O · 2.5Al2O3 · 52.5P2O5 (R = Mg, Ca, Sr, Ba, 0 ⩽ x⩽ 31 mol%) glasses were investigated.
Abstract: The properties and structure of (45 - x)RO · xNa2O · 2.5Al2O3 · 52.5P2O5 (R = Mg, Ca, Sr, Ba, 0 ⩽ x ⩽ 31 mol%) glasses were investigated. The variation in the molar volumes of glasses in the MgO series is closely related to the formation of the end groups in the glasses with the substitution of Na+ ions for Mg2+ ions, resulting in a variation of the density and refractive index of the glasses. The properties of glasses containing CaO in terms of Na2O substitution depend mainly on the low field strength of Na+ ions substituting for CaO even though the end groups occurring in the glasses increased. The variation in properties of the glasses containing SrO and BaO, some of which were substituted by Na2O, could be explained by differences in masses, field strength and polarizability between the Na+ ions and the alkaline-earth ions due to a small variation in the structure of the glasses despite Na2O substitution.
95 citations
TL;DR: In this paper, a total 264 pork loins were selected to represent a wide range of pork quality of the longissimus thoracis et lumborum, and a CIE L*C*h color space showed a closer relationship to the subjective color score than L*a*b*color space.
Abstract: A total 264 pork loins were selected to represent a wide range of pork quality of the longissimus thoracis et lumborum. CIE L*C*h color space showed a closer relationship to the subjective color score than L*a*b*color space. Lightness (L*) was the best measure to predict water-holding capacity (WHC). There were highly significant (p < 0.001) correlations between the measures of color and WHC, and curvilinear relationships between either WHC and color or pHu were observed. In normal muscle color range (reddish-pink), there was considerable variation in WHC. Within the RSE + RFN groups of muscles, less variation of WHC could be accounted for by variations in color measurements. Color and WHC were not closely related and suggest that the RSE (reddish-pink, soft, exudative) condition should be classified as a separate quality category of pork muscle.
93 citations
TL;DR: A new method for modeling and recognizing cursive words with hidden Markov models (HMM) is presented, using a sequence of thin fixed-width vertical frames that capture the local features of the handwriting.
90 citations
TL;DR: The inclusive muon spectrum extends over the kinematic range {vert_bar}{ital y}{Sup {mu}}{vert-bar}{lt}0.8 and 3.5{lt}{ital p}{sub {ital T}}{sup {mu}60GeV/{ital c}, and is well described by the expected contributions from various known sources.
Abstract: We report a measurement of the inclusive muon and {ital b}-quark production cross sections in {ital p{bar p}} collisions at {radical}{ital s}=1.8 TeV using the D0 detector at the Fermilab Tevatron collider. The inclusive muon spectrum extends over the kinematic range {vert_bar}{ital y}{sup {mu}}{vert_bar}{lt}0.8 and 3.5{lt}{ital p}{sub {ital T}}{sup {mu}}{lt}60GeV/{ital c}, and is well described by the expected contributions from various known sources. The {ital b}-quark production cross section for {vert_bar}{ital y}{sup {ital b}}{vert_bar}{lt}1.0 and {ital p}{sup {ital b}}{sub {ital T}}{gt}6GeV/{ital c} is extracted, and agrees with next-to-leading order QCD predictions within the experimental and theoretical uncertainties.
84 citations
TL;DR: In this paper, the W boson mass in W − ev decays was measured using 1 fb^-1 of data collected with the D0 detector during Run II of the Fermilab Tevatron collider.
Abstract: We present a measurement of the W boson mass in W -> ev decays using 1 fb^-1 of data collected with the D0 detector during Run II of the Fermilab Tevatron collider. With a sample of 499830 W -> ev candidate events, we measure M_W = 80.401 +- 0.043 GeV. This is the most precise measurement from a single experiment.
75 citations
TL;DR: This paper proposes a new method for the direct extraction of topographic features from gray scale character images by computing the directions of principal curvature efficiently and prevented the extraction of unnecessary features.
Abstract: Optical character recognition (OCR) traditionally applies to binary-valued imagery although text is always scanned and stored in gray scale. However, binarization of multivalued image may remove important topological information from characters and introduce noise to character background. In order to avoid this problem, it is indispensable to develop a method which can minimize the information loss due to binarization by extracting features directly from gray scale character images. In this paper, we propose a new method for the direct extraction of topographic features from gray scale character images. By comparing the proposed method with Wang and Pavlidis' method, we realized that the proposed method enhanced the performance of topographic feature extraction by computing the directions of principal curvature efficiently and prevented the extraction of unnecessary features. We also show that the proposed method is very effective for gray scale skeletonization compared to Levi and Montanari's method. >
72 citations
TL;DR: In this article, the ZEUS detector has been used to measure the proton structure function F2 and the rapid rise in F2 asx decreases observed previously is now studied in greater detail and persists for Q2 values up to 500 GeV2.
Abstract: The ZEUS detector has been used to measure the proton structure functionF2. During 1993 HERA collided 26.7 GeV electrons on 820 GeV protons. The data sample corresponds to an integrated luminosity of 0.54 pb−1, representing a twenty fold increase in statistics compared to that of 1992. Results are presented for 7
TL;DR: In this article, a simple multilayer cluster neural network with five independent subnetworks for off-line recognition of totally unconstrained handwritten numerals was proposed, and the use of genetic algorithms for avoiding the problem of finding local minima in training the multi-layer cluster neural networks with gradient descent technique reduces error rates.
TL;DR: In this article, Dijet cross sections are presented using photoproduction data obtained with the ZEUS detector during 1994, which represent an extension of previous results as the higher statistics allow cross sections to be measured at higher jet transverse energy (Eτjet).
TL;DR: In this article, the authors compared the operating characteristics of laboratory UASB and fixed film reactors with various wastes: complex carbohydrate vs simple volatile waste, and concentrated vs diluted wastes, and found that the sludge granulation was influenced more by the characteristics of the waste used than by the reactor type itself.
TL;DR: In this paper, the role played by molecular parameters in the existence of SA phases was examined in a series of several homologues of KIS and two smectic modulations exist in agreement with the phenomenological model of "frustrated smectics".
Abstract: Genuine incommensurate smectic A phases were recently discovered, among the rich polymorphism of a new dimesogemc liquid crystal compound (KIS) In the present paper, we examine the role played by molecular parameters in the existence of such incommensurate state In a series of several homologues of KIS, we find that two smectic modulations exist in agreement with the phenomenological model of "frustrated smectics" The condensation of one or the other of these modulations and their coexistence appear to be closely related to the length of the flexible spacer linking the two mesogemc moieties We observe that only for intermediate spacer length, the elasticity of the system allows the occurrence of incommensurate SA phases
TL;DR: In this paper, the authors present experimental verification of a type I conduction band alignment for coherently strained SiGe and SiSiGe layers in (001) silicon, with a novel substrate bending scheme applied in-plane uniaxial compressive and tensile stress along the [100] and [110] directions.
Abstract: We present experimental verification of a type I conduction band alignment for coherently strained ${\mathrm{Si}}_{1\ensuremath{-}x}{\mathrm{Ge}}_{x}$ layers in (001) silicon, with $0.15\ensuremath{\le}x\ensuremath{\le}0.38$. A novel substrate bending scheme is used to apply in-plane uniaxial compressive and tensile stress along the [100] and [110] directions. Band edge photoluminescence from SiGe and Si is shifted with stress in accordance with deformation potential theory. Tensile stress along [110] allows clear distinction between types I and II band alignment where the predicted shifts are in opposite directions.
TL;DR: Results on the search for the top quark in {ital p{bar p}} collisions at {radical}{ital s} =1.8 TeV with an integrated luminosity of 13.5 TeV are presented.
Abstract: We present results on the search for the top quark in {ital p{bar p}} collisions at {radical}{ital s} =1.8 TeV with an integrated luminosity of 13.5{plus_minus}1.6 pb{sup {minus}1}. We have considered {ital t{bar t}} production in the standard model using electron and muon dilepton decay channels ({ital t{bar t}}{r_arrow}{ital e}{mu}+jets, {ital ee}+jets, and {mu}{mu}+jets) and single-lepton decay channels ({ital t{bar t}}{r_arrow}{ital e}+jets and {mu}+jets) with and without tagging of {ital b} quark jets. An analysis of these data optimized for top quark masses below 140 GeV/{ital c}{sup 2} gives a lower top quark mass limit of 128 GeV/{ital c}{sup 2}. An analysis optimized for higher top quark masses yields 9 events with an expected background of 3.8{plus_minus}0.9. If we assume that the excess is due to {ital t{bar t}} production, and assuming a top quark mass of 180 GeV/{ital c}{sup 2}, we obtain a cross section of 8.2{plus_minus}5.1 pb.
TL;DR: In this paper, the exclusive production of ϱ 0 mesons in deep inelastic electron-proton scattering has been studied using the ZEUS detector, where cross sections have been measured in the range 7 Q 2 2 for λ ∗ p center of mass (c.m.) energies 40 to 130 GeV.
Kobe University1, Wonkwang University2, Gyeongsang National University3, Kyoto University4, Changwon National University5, Nagoya University6, KEK7, Toho University8, Korea University9, Chonnam National University10, Aichi University of Education11, Yokohama National University12, University of Tokyo13, Gifu University14, Kyoto Sangyo University15, Osaka City University16
Journal Article•
TL;DR: Pediatric patients of any age with positive P-170 expression using monoclonal antibodies MRK-16 with a FITC-conjugated second step reagent fared no worse than remaining patients treated on the same treatment with regard to induction failure, incidence of relapse, event-free survival, or overall survival.
Abstract: Expression of the multidrug resistance (MDR-1) gene product, P-glycoprotein (P-170), and the stem cell antigen, CD34, at diagnosis were determined using monoclonal antibodies (MoAbs) MRK-16 and 12.8 respectively, in 130 pediatric acute myeloid leukemia (AML) patients entered onto Childrens Cancer Group (CCG) study CCG-2891. Fluorescein isothiocyanate (FITC) as a second step reagent was employed for the measurement of P-170 expression since it is commonly used in clinical laboratories. Nine of 30 (30%) infant ( or = 20% of control cells. In contrast, eight of 100 (8%) AML samples from older children ( > or = 1 year of age) expressed the multidrug resistance surface protein at diagnosis. With the exception of one infant, all de novo samples that expressed P-170 also expressed CD34. Pediatric patients of any age with positive P-170 expression using MoAb MRK-16 with a FITC-conjugated second step reagent fared no worse than remaining patients treated on the same treatment with regard to induction failure, incidence of relapse, event-free survival, or overall survival. Further investigation is necessary to determine whether P-170 assay systems with greater sensitivity will distinguish pediatric AML patients with poor prognosis.
TL;DR: In this article, the relationship between the space charge behavior and the electrical conduction characteristics in LDPEg-MAH was discussed, where the authors found that the Heterocharge was found to decrease with increasing MAH graft ratio.
Abstract: The space charge behavior such as charge distribution and electrical conduction of maleic anhydride grafted LDPE (LDPE-g- MAH) was investigated. Heterocharge was found in LDPE and it decreased with increasing MAH graft ratio in LDPEg- MAH. Conduction currents also decreased with increasing MAH graft ratio. The relationship between the space charge behavior and the electrical conduction characteristics in LDPEg- MAH is discussed.
TL;DR: A 7.0-kb DNA fragment that conferred redbrown pigment production on Streptomyces griseus was shotgun-cloned with a multicopy vector pIJ486 from this microorganism, suggesting that RppA and RppB are capable of synthesizing the red brown pigment from metabolites commonly present in bacteria.
Abstract: A 7.0-kb DNA fragment that conferred redbrown pigment production on Streptomyces griseus was shotgun-cloned with a multicopy vector pIJ486 from this microorganism. By restriction endonuclease mapping and subcloning, a 1.5-kb fragment which is essential for the production of redbrown pigment was determined. The nucleotide sequence of this region revealed the presence of two open reading frames, ORF1 with 109 amino acids (named RppA) and ORF2 with 262 amino acids (RppB), in addition to a truncated ORF3. The termination codon of rppA and the initiation codon of rppB overlapped, sharing one common nucleotide, which strongly suggests that these two genes are cotranscribed. Both rppA and rppB were essentially required for the pigmentation. The RppB protein showed great similarity in amino acid sequence to a chalcone synthase, a key enzyme of central importance in the biosynthetic pathway of all classes of flavonoids in plants. Part of RppA showed sequence similarity to the 33kDa phosphoprotein of adenovirus. Nucleotide sequences homologous to rppA and rppB were widely distributed in Streptomyces species, as determined by Southern hybridization. Further nucleotide sequencing of the entire orf-3 gene showed that ORF3 with 403 amino acids was a cytochrome P-450 (named P-450RPP). These data suggested that the cloned fragment contained part of a gene cluster for the biosynthesis of a certain metabolite. Introduction of the subcloned 1.5-kb fragment into Streptomyces lividans as well as Escherichia coli also caused production of redbrown pigment, suggesting that RppA and RppB are capable of synthesizing the redbrown pigment from metabolites commonly present in bacteria.
TL;DR: It is hypothesized that the destruction of A delta- and C-nociceptive fibers by capsaicin prevented activities induced in these fibers by the nerve injury from producing a central sensitization and thus allodynia.
Abstract: We investigated the role of capsaicin-sensitive small diameter fibers in the development of the thermal and mechanical allodynia in a new rat model for neuropathic pain, produced by transecting some but not all of the nerves innervating the tail. Capsaicin (50 mg/kg, s.c.) injected neonatally prior to the nerve injury produced thermal hypoalgesia in the tail the degree of which was variable across individual rats, presumably as a result of variable degeneration of the small diameter fibers. When subjected to the nerve injury, the animals with moderate thermal hypoalgesia exhibited signs of pain (e.g., tail flick) to normally innocuous mechanical stimuli applied to the tail with von Frey hairs (4.9 mN or 19.6 mN bending force), but not to thermal stimuli given by immersion of the tail into cold (4 degrees C) or warm (40 degrees C) water. The animals with marked thermal hypoalgesia, on the other hand, exhibited no signs of pain either to the mechanical or to the thermal stimuli. These results suggest that the capsaicin-sensitive fibers are critical in the development of both the mechanical and thermal allodynia. It is hypothesized that the destruction of A delta- and C-nociceptive fibers by capsaicin prevented activities induced in these fibers by the nerve injury from producing a central sensitization and thus allodynia.
TL;DR: The idea that the age at the time of partial peripheral nerve injury affects the severity of certain neuropathic pain symptoms appearing after the injury is supported, however, the present results argue against the suggestion from previous studies that younger subjects are more vulnerable to partial peripheral nerves injury-induced neuropathicPain symptoms.
TL;DR: In this article, an asymmetric cellulose triacetate (CTA) membrane system was examined by employing trifluoroacetophenone derivatives and metalloporphyrins as the carbonate and chloride ionophores, respectively.
TL;DR: The partial human cDNA sequence and the localization of the corresponding gene on chromosome 6p21 are reported and revealed an overall homology to recently described yeast SKI2, which is involved in the antiviral system.
TL;DR: The first observation of charmed mesons with the ZEUS detector at HERA using the decay channel D ∗+ → (D 0 → K − π + )π + (+c.c.) was reported in this article, where clear signals in the mass difference ΔM(D ∗ )−M( D 0 ) as well as in the M(Kπ) distribution at the D0 mass are found.
TL;DR: In this article, the on-off intermittency in a synchronization process between two unidirectionally coupled nonlinear oscillators was found to be related to the fluctuation in the transverse Lyapunov exponents.
14 Aug 1995
TL;DR: An integrated binarization scheme is developed, exploiting synergistic use of an adaptive thresholding technique and variable histogram equalization to counter the stroke connectivity problems of characters arising from mid-level-quality binary image scanning systems.
Abstract: A binarization method is presented to counter the stroke connectivity problems of characters arising from mid-level-quality binary image scanning systems. In the output of a binary image scanning system, separate strokes may look connected if the point size is small and the character strokes are complex while strokes may lose connectivity if they are generated at low intensity. Also, erroneous recognition may result if a blemished document surface distorts the image. To counter these problems and to further enhance the quality of character recognition, the authors have developed an integrated binarization scheme, exploiting synergistic use of an adaptive thresholding technique and variable histogram equalization. This algorithm is composed of two components. The first removes background noise via gray level histogram equalization while the second enhances the gray level of characters over and above the surrounding background via an edge image composition technique.
TL;DR: In this paper, the influence of the crystallographic texture and the dislocation structure on the deformation mechanism in low carbon steels was investigated by employing X-ray texture measurements and TEM observations.
Abstract: In order to understand the influence of the crystallographic texture and the dislocation structure on the deformation mechanism in low carbon steels, the development of the texture and the microstructure in cross-rolled specimens was investigated by employing X-ray texture measurements and TEM observations. The cross-rolled specimens were obtained by rotating the rolling direction by various angles up to 90° after 30% initial straight-rolling of the hot rolled band. Whereas only few shear bands were found in the straight-rolled specimen even after heavy deformation, in the cross-rolled specimen shear bands were often found at reductions in excess of 60%. This observation is discussed in terms of the rotation of the arrangement of dislocations and microbands during cross-rolling. The rolling textures observed in the various samples were interpreted by means of Taylor type deformation models.