Showing papers by "Korea University published in 1990"
TL;DR: A smoothed bootstrap method based on an initial density estimate is described that solves the problem of how to construct pointwise and simultaneous confidence intervals for the density and uniformly outperforms cross-validation.
Abstract: A bootstrap-based choice of bandwidth for kernel density estimation is introduced. The method works by estimating the integrated mean squared error (IMSE) for any given bandwidth and then minimizing over all bandwidths. A straightforward application of the bootstrap method to estimate the IMSE fails because it does not capture the bias component. A smoothed bootstrap method based on an initial density estimate is described that solves this problem. It is possible to construct pointwise and simultaneous confidence intervals for the density. The simulation study compares cross-validation and the bootstrap method over a wide range of densities—a long-tailed, a short-tailed, an asymmetric, and a bimodal, among others. The bootstrap method uniformly outperforms cross-validation. The accuracy of the constructed confidence bands improves as the sample size increases.
142 citations
01 Jan 1990
TL;DR: It is highly possible to identify HFRS and HFRS-like illnesses caused by hantaviruses in parts of the world where HFRS is not known because of the availability of serodiagnostic tests.
Abstract: World-wide, about 150,000 people are hospitalized with hemorrhagic fever with renal syndrome (HFRS) (3–10% fatality) each year. The etiologic agents of HFRS are Hantaan, Seoul, and Puumala viruses of the genus Hantavirus, family Bunyaviridae. A severe form of HFRS, caused by Hantaan virus, occurs in Asia and eastern parts of Europe, a moderate form, caused by Seoul virus, occurs in Asia, and a mild form, caused by Puumala virus, occurs in Europe. Hantaan virus occurs in Asia and in eastern parts of Europe, Seoul-like viruses occur world-wide, Puumala virus occurs in Europe, and Prospect Hill and Leaky viruses (other hantaviruses) have been isolated in the U.S.A. The reservoirs of hantaviruses are rodents and other small mammals. Serologic studies of 42 hantaviruses isolated from HFRS patients and from animals indicated that there are 6 or 7 serotypes. In the 1990s, it is highly possible to identify HFRS and HFRS-like illnesses caused by hantaviruses in parts of the world where HFRS is not known because of the availability of serodiagnostic tests.
76 citations
University of South Carolina1, Louisiana State University2, Virginia Tech3, Ohio State University4, University of California, Davis5, University of Rochester6, Konan University7, University of Minnesota8, Niigata University9, Rutgers University10, University of the Philippines11, University of Tsukuba12, Saga University13, Korea University14, Kyungpook National University15, Chuo University16, Saitama University17
TL;DR: These measurements are compared with QCD+fragmentation models that use either leading-logarithmic parton-shower evolution or QCD matrix elements at the parton level, and either string or cluster fragmentation for hadronization.
Abstract: We present the general properties of multihadron final states produced by {ital e}{sup +}{ital e}{sup {minus}} annihilation at center-of-mass energies from 52 to 57 GeV in the AMY detector at the KEK collider TRISTAN. Global shape, inclusive charged-particle, and particle-flow distributions are presented. Our measurements are compared with QCD+fragmentation models that use either leading-logarithmic parton-shower evolution or QCD matrix elements at the parton level, and either string or cluster fragmentation for hadronization.
65 citations
TL;DR: The present review mainly deals with current results obtained by Korean investigators on the prevalence of clonorchiasis, as well as its biology, epidemiology, pathogenesis, clinical manifestations, diagnosis, treatment, prevention and control.
Abstract: Since the first report on the incidence of egg positiveness of Clonorchis sinensis by Matsumoto in 1915, clonorchiasis has been recognized as one of the most important endemic diseases in Korea. Most of the works on clonorchiasis after then had been studied by Japanese workers until 1945. After the Korean War in 1950-1953, health problems of Koreans were extremely aggravated. This gave us attentions for the prevention of contagious diseases as well as parasitic infections in public health point of view. It was greatly recognized that not only ascariasis, hookworm infections, and trichuriasis, but also clonorchiasis and paragonimiasis constitute the important helminthic diseases in Korea. In the late 1950s, several Korean workers conducted studies of C. sinensis on its biology, epidemiology, pathology, clinical symptoms as well as treatment. Thereafter overall epidemiological surveys were carried out actively throughout the country since 1960s. From these surveys, it became clear that endemic areas of clonorchiasis are scattered all over the country along the Nakdong, Kum, Mankyong, Yeongsan and Han rivers. The most extensive and intensive endemic regions were found mainly along the Nakdong river. Since then, clonorchiasis has been one of the most extensively studied subjects during the past 30 years. The present review mainly deals with current results obtained by Korean investigators on the prevalence of clonorchiasis, as well as its biology, epidemiology, pathogenesis, clinical manifestations, diagnosis, treatment, prevention and control.
49 citations
University of Rochester1, University of Tsukuba2, Louisiana State University3, University of South Carolina4, Virginia Tech5, Ohio State University6, University of California, Davis7, Konan University8, University of Minnesota9, Niigata University10, University of the Philippines11, Rutgers University12, Saga University13, Korea University14, Kyungpook National University15, Chuo University16, Saitama University17
TL;DR: In this article, the authors presented the charged-particle multiplicity distributions for {ital e}{sup +}{ital e}sup {minus} annihilation at center-of-mass energies from 50 to 61.4 GeV.
Abstract: We present the charged-particle multiplicity distributions for {ital e}{sup +}{ital e}{sup {minus}} annihilation at center-of-mass energies from 50 to 61.4 GeV. The results are based on a data sample corresponding to a total integrated luminosity of 30 pb{sup {minus}1} obtained with the AMY detector at the KEK storage ring TRISTAN. The charged-particle multiplicity distributions deviate significantly from the modified Poisson and pair Poisson distributions, but follow Koba-Nielsen-Olesen scaling and are well reproduced by the LUND parton-shower model.
44 citations
TL;DR: In this paper, the authors found that the measuring height on the axis of a bed was a very important factor for the determination of minimum fluidization velocity from the linear relationship between standard deviation and air velocity.
41 citations
Niigata University1, Chuo University2, Louisiana State University3, Virginia Tech4, University of South Carolina5, Ohio State University6, University of California, Davis7, University of Rochester8, Konan University9, University of Minnesota10, Rutgers University11, University of the Philippines12, Saga University13, Korea University14, Kyungpook National University15, Saitama University16
TL;DR: In this paper, the photon structure function F2 has been measured at average Q2 values of 73,160 and 390 (GeV c ) 2, and the x dependence of the Q2 = 73 ( GeV c 2 ) 2 data with theoretical expectations based on QCD was compared.
38 citations
TL;DR: In this article, the vertical Bridgman method was used to grow CdTe wafers with p-type conductivity and low IR transmittance in the Cd atmosphere.
32 citations
Aichi University of Education1, University of California, Davis2, Carnegie Mellon University3, Chonnam National University4, Fermilab5, Gifu University6, Gyeongsang National University7, Kindai University8, Kobe University9, Korea University10, Nagoya Institute of Technology11, Nagoya University12, Ohio State University13, Okayama University14, University of Oklahoma15, Osaka City University16, Toho University17, Utsunomiya University18, Wonkwang University19
01 Apr 1990-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: A hybrid apparatus consisting of a movable emulsion target and a magnetic spectrometer was used in a fixed target Fermilab Tevatron experiment to study the production of heavy quarks by high-energy hadron beams.
Abstract: A hybrid apparatus consisting of a movable emulsion target and a magnetic spectrometer was used in a fixed target Fermilab Tevatron experiment to study the production of heavy quarks by high-energy hadron beams. High-resolution silicon microstrip detectors were used for precise tracking in the dense particle environment. Details of the experimental apparatus, including the data acquisition system, are described.
32 citations
TL;DR: Subcutaneous injection of the vaccine was better than intramuscular injection for production of antibodies in humans and the efficacy of this vaccine against HFRS in the endemic areas of HFRS remains to be determined.
Abstract: Hantaan virus was serially passaged in the brains of suckling rats. Vaccine inactivated with formalin was prepared from the suckling rat brains and the antigenic potency of the vaccine was determined by enzyme-linked immunosorbent assay (ELISA). Mice immunized with the vaccine were protected when challenged with live Hantaan virus. The antibody responses of 456 vaccinees given inactivated Hantaan virus vaccine against hemorrhagic fever with renal syndrome (HFRS) were then studied. Subcutaneous injection of the vaccine was better than intramuscular injection for production of antibodies in humans. Optimal immunogenic dose of the vaccine given subcutaneously to humans was 5,120 ELISA antigen units. Of 456 vaccinees, immunization of 336 with two doses of vaccine at one month interval resulted in 99% seroconversion by indirect immunofluorescent antibody tests. The vaccine was safe and only minimum side effects were observed. The efficacy of this vaccine against HFRS in the endemic areas of HFRS remains to be determined.
32 citations
TL;DR: The observed parallelism between the SOD activity and the cytogenetic manifestation may imply an involvement of active oxygen species, especially superoxide radicals, in the increased chromosome damage of CIS cells.
University of Rochester1, University of Tsukuba2, Louisiana State University3, University of South Carolina4, Virginia Tech5, Ohio State University6, University of California, Davis7, Konan University8, University of Minnesota9, Niigata University10, University of the Philippines11, Rutgers University12, Saga University13, Korea University14, Kyungpook National University15, Chuo University16, Saitama University17
TL;DR: In this paper, the authors measured the ratio of the total cross section for {ital e}{sup +}{ital e-sup {minus}} annihilation into hadrons to the lowest-order QED cross section.
Abstract: The ratio {ital R} of the total cross section for {ital e}{sup +}{ital e}{sup {minus}} annihilation into hadrons to the lowest-order QED cross section for {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{mu}{sup +}{mu}{sup {minus}} has been measured for center-of-mass energies ranging from 50 to 61.4 GeV. If we allow for an overall shift of {minus}4.9%, about 1.5 times our estimated normalization error, the results are consistent with the standard-model predictions.
TL;DR: Immunoreactive components of Opisthorchis viverrini and Clonorchis sinensis were analysed by enzyme-linked immunosorbent assay (ELISA), radioimmunoprecipitation and immunoblotting and analyses showed that the 89-kD protein which was previously shown to be a predominant metabolic product of O. viverRini reacted with sera from both groups of patients.
Abstract: Immunoreactive components of Opisthorchis viverrini and Clonorchis sinensis were analysed by enzyme-linked immunosorbent assay (ELISA), radioimmunoprecipitation and immunoblotting. Somatic extracts from these two liver flukes as well as from other related parasites, together with the metabolic products, were tested for their reactivities with sera from patients with opisthorchiasis and clonorchiasis. A significant cross-reactivity in the ELISA was noted between Opisthorchis and Clonorchis. Immunoblotting and radioimmunoprecipitation analyses showed that the 89-kD protein which was previously shown to be a predominant metabolic product of O. viverrini reacted with sera from both groups of patients. However, an antigen with a molecular weight of 16 kD, apparently a predominant somatic component, appeared to be specific for O. viverrini.
University of California, Davis1, Louisiana State University2, University of South Carolina3, Virginia Tech4, Ohio State University5, University of Rochester6, Konan University7, University of Minnesota8, Niigata University9, University of the Philippines10, Rutgers University11, University of Tsukuba12, Saga University13, Korea University14, Kyungpook National University15, Chuo University16, Saitama University17
TL;DR: In this paper, a search for the pair production of leptoquarks and colored leptons in e + e − annihilations t center-of-mass energies from 50 to 60.8 GeV was conducted using the AMY detector at TRISTAN.
TL;DR: In this article, economic screening procedures for improving outgoing product quality based on screening variables are presented for the cases of one-and two-sided specification limits, assuming that the performance and screening variables jointly normally distributed and that costs are incurred by screening inspection and misclassification errors.
Abstract: Economic screening procedures for improving outgoing product quality based on screening variables are presented for the cases of one- and two-sided specification limits. It is assumed that the performance and screening variables are jointly normally distributed and that costs are incurred by screening inspection and misclassification errors. When all parameters are known, a closed-form solution is obtained for the case of one-sided specification limit and an approximate closed-form solution is derived for the case of two-sided specification limits. Methods for finding optimal solutions based on normal conditioned ont-distribution are presented for the cases of unknown parameters.
TL;DR: With these characteristics, acinar cell carcinoma can be distinguished from the locally invasive common adenocarcinoma of the pancreas, but the differentiation from some other less common pancreatic tumors remains difficult.
Virginia Tech1, University of Rochester2, Louisiana State University3, University of South Carolina4, Ohio State University5, University of California, Davis6, Konan University7, University of Minnesota8, Niigata University9, Rutgers University10, University of the Philippines11, Saga University12, Korea University13, Kyungpook National University14, Chuo University15, Tokyo Institute of Technology16, Saitama University17
TL;DR: In this article, the pair production of the supersymmetric partner particles of leptons, quarks, and non-minimal Higgs have been made in e + e − annihilations at center-of-mass energies between 50 and 60.8 GeV using the AMY detector at TRISTAN.
TL;DR: In this article, a two-stage swirl-flow fluidized bed combustor was used to investigate the combustion characteristics of low-grade anthracite coal, and the results showed that the combustion efficiency of the two stage swirled-flow bed combustors was 20% greater than that of a single-stage fluidized-bed combustor under the same operating conditions.
Abstract: In order to investigate the combustion characteristics of a two-stage swirl-flow fluidized bed combustor, combustion experiments of low-grade anthracite coal were performed. Experimental parameters were the fluidizing air velocity, coal feed rates, bed temperature, stoichiometric air ratio, swirl nozzle diameter and rotational diameter. The experimental results showed that, due to the swirl flow, the elutriation rates of fines were lower than those of the single-stage fluidized bed combustor. The combustible contents of the ash in the outflow streams were also reduced. Therefore, the combustion efficiency of the two-stage swirl-flow fluidized bed combustor was 20% greater than that of the single-stage fluidized bed combustor under the same operating conditions.
Dans le but d'etudier les caracteristiques de combustion d'un systeme a lit fluidise a ecoulement tourbillonnant bietage, nous avons mene des experiences de l'anthracite de qualite mediocre. Les parametres experimentaux sont les suivants: vitesse fluidisante de l'air, vitesses d'alimentation en charbon, temperature du lit, rapport stochiometrique de l'air, diametre de l'orifice de tourbillons et diametre rotationnel. Les resultats experimentaux montrent qu'en raison de l'ecoulement tourbillonnant, les vitesses de decantation des fines etaient inferieures aux vitesses du combusteur a lit fluidise monoetage. Les teneurs en combustible de la cendre dans les jets d'ecoulement ont egalement ete reduites. Ainsi, l'efficacite de combustion du combusteur a lit fluidise a ecoulement tourbillonnant bietage est de 20% superieure a celle du combusteur a lit fluidise monoetage dans les memes conditions d'operation.
TL;DR: In this paper, the leakage current effects for the midgap levels in the EBM Al/GaAs junction were studied by isothermal capacitance transient spectroscopy, and a new electron deep level which might be due to the surface defects induced during the electron beam-metallized (EBM) process was detected.
Abstract: The leakage current effects for the midgap levels in the electron‐beam‐metallized (EBM) Al/GaAs junction were studied by isothermal capacitance transient spectroscopy. In this junction, a new electron deep level which might be due to the surface defects induced during the EBM process was detected. The observed thermal emission time constants of the new deep level and the EL2 level (Ec −0.81 eV) in EBM‐Al/GaAs were increased during the low‐temperature annealing up to 355 °C, while the leakage current density in this junction was decreased down about 4×10−7 A/cm2. We represent that these behaviors of the midgap levels could be well explained by the effect of the leakage current in the Al/GaAs Schottky junction.
TL;DR: In this paper, two main chain thermotropic polyesters having a decamethylene spacer were studied and their thermal transitions and liquid crystalline properties were found to influence the mesophase formation.
Abstract: Two series of main chain thermotropic polyesters having a decamethylene spacer were prepared and their thermal transitions and liquid crystalline properties were studied. The linking sequence of the ester bond between the mesogenic unit and spacer, i.e., versus with M and S being mesogenic unit and spacer, respectively, was found to influence profoundly the nature of the mesophase formed by the polymers. The former favors the formation of a smectic phase, while the latter favors the formation of a nematic phase. The structure of the central dicarboxylic acid moiety of the triester mesogenic units also was found to influence greatly the polymer's ability to form mesophases.
01 Jan 1990
TL;DR: Antibody against hantaviruses was measured within forty minutes by a passive agglutination procedure using high density composite particles coated with purified Hantaan virus antigen, which is more sensitive than the immunofluorescent antibody technique.
Abstract: Antibody against hantaviruses was measured within forty minutes by a passive agglutination procedure using high density composite particles coated with purified Hantaan virus antigen. Antigen for the reaction was prepared from the brains of suckling rats infected with Hantaan virus, using ultracentrifugation, protamine and ethyl alcohol treatment. This method is more sensitive than the immunofluorescent antibody technique and the antigen reacted with antibodies to Hantaan, Seoul and Puumala viruses.
TL;DR: It is suggested that the substances comprising the basal lamina of the tegument or vitelline glands act as specific antigens reacting with antigen(body fluid) immunized rabbit IgG.
Abstract: In order to observe the antigenic localization in the tissues of the adult Clonorchis sinensis, immunogold labeling method was applied using serum immunoglobulins (IgG) of either worm-infected rabbits (group I) or antigen-immunized rabbits (group II) (by the body fluid obtained from the adult worms) The electron micrographs of the sectioned worm tissue antigens, embedded in Lowicryl HM 20 medium and stained with protein A-gold complex (particle size: 12 nm), were compared between the group I and group II The gold particles were observed in the interstitial matrix of the worm parenchyma, the epithelial lamellae of the cecum, and the cecal lumen both in group I and II But the particles were in general more concentrated in group II The gold particles were not observed on the basal lamina of the tegument or on vitelline glands in group I, while they were highly concentrated on those areas in group II There were also differences in the antigenicity of interstitial matrix(reacted with group I IgG) and head part(reacted with group II IgG) of the sperm cells in the seminal receptacle Conclusively, it is suggested that the substances comprising the basal lamina of the tegument or vitelline glands act as specific antigens reacting with antigen(body fluid) immunized rabbit IgG On the other hand, the substances in the cecal lumen and cecal epithelial lamellae are thought to be the specific antigen that react with the worm-infected rabbit IgG
University of Rochester1, University of Tsukuba2, Louisiana State University3, Virginia Tech4, University of South Carolina5, Ohio State University6, University of California, Davis7, Konan University8, University of Minnesota9, Niigata University10, Rutgers University11, University of the Philippines12, Saga University13, Korea University14, Kyungpook National University15, Chuo University16, Saitama University17
TL;DR: In this article, the authors report results of a study of four-lepton final states produced in e+e− collisions at center-of-mass energies from 50 to 61.4 GeV using the AMY detector at the TRISTAN collider.
TL;DR: It is shown and verified experimentally that with two offset pupil functions, both having Gaussian shape, the two-pupil heterodyne scanning system can achieve tunable bandpass filtering operations.
Abstract: A two-pupil heterodyne scanning system has been used previously to perform bipolar incoherent spatial filtering. In this paper, we exploit the system's potential in tunability. It is shown and verified experimentally that with two offset pupil functions, both having Gaussian shape, we can achieve tunable bandpass filtering operations. Potential applications in space-variant filtering on incoherent objects are discussed.
TL;DR: Spermidine prevented the loss of chlorophyll from detached komatsuna leaves in the dark but caused a striking reduction in light; the envelope was lacking, grana were dilated and thylakoids were distributed throughout the cytoplasm.
Abstract: Spermidine prevented the loss of chlorophyll from detached komatsuna (Brassica campestris cv. komatsuna) leaves in the dark but caused a striking reduction in light. It also inhibited photochemical activity in leaves incubated in the dark and light. Striking changes were seen in the chloroplast ultrastructure in light; the envelope was lacking, grana were dilated and thylakoids were distributed throughout the cytoplasm.
TL;DR: In this paper, the use of dichlorophosphoric acid and phenylphosphonic dichloride was found to be very effective for β-lactam formation from β-amino acids.
TL;DR: This paper examined the hypothesis that domestic farm politics determines the nation's trade policy and found that the international political economy significantly dictates the formulation of its domestic farm policy. But the hypothesis was not supported by empirical evidence.
TL;DR: In this paper, the authors investigate the dependency of Gaussian random fields X(D) indexed by a domain D in d-dimensional Euclidean space Rd with white noise analysis.
Abstract: The purpose of this paper is to investigate way of dependency of Gaussian random fields X(D) indexed by a domain D in d-dimensional Euclidean space Rd . Our main tool is variational calculus, where the boundary of a domain varies and deforms and we appeal to the white noise analysis. We therefore assume that X(D) is expressed white noise integral of the form (0.1) X(D) = X(D, W)=∫D F(D, u)W(u)du, where W is the Rd -parameter white noise and the kernel F(D, u) is a square integrable function over Rd , and where D is a bounded domain with smooth boundary.
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