Showing papers by "Kyungpook National University published in 1984"

Cross‐polar cap potential drop and the energy coupling function

Abstract: A numerical model is formulated for correlations between the cross polar cap potential, the solar wind, and the AI index and compared with satellite data. The conductivity model was devised from empirically defined relationships between the Hall and Pedersen conductivities and the measured magnitude of the horizontal magnetic disturbance near College, AK. An instantaneous conductivity distribution was generated from data gathered at, e.g., six IMS meridian chain stations. A strong correlation appeared between an energy coupling function (ECF) and the polar cap potential drop. The ECF was derived from the chain station data, implying that potential drop estimates can be made from ground-based magnetometer data.

R plasmids conferring multiple drug resistance from shigella isolated in Korea.

Abstract: The majority (85%) of shigella isolated in 1980 and 1981 in Korea were Shigella flexneri, the others were Sh. sonnei (14%) with only a small number of Sh. dysenteriae. Only 14 of the 459 strains of shigella isolated were susceptible to all 12 drugs tested, and 445 were resistant to three or more drugs. Strains multiply resistant to the six drugs, chloramphenicol (Cm), tetracycline (Tc), streptomycin (Sm), sulfisomidine (Su), ampicillin (Ap) and trimethoprim (Tp) were most frequently encountered, followed by those resistant to Cm, Tc, Sm, Su and Tp. The complete patterns of resistance to drugs except nalidixic acid and rifampin in approximately 73% of drug-resistant strains were co-transferred to Escherichia coli by conjugation, indicating that the resistance was R plasmid-mediated. Randomly selected R plasmids conferring various patterns of resistance markers were tested for the incompatibility groups, and almost all of them were classified into Inc FII. Two of three R plasmids conferring resistance to Cm, Tc, Sm and Su were classified into Inc B and one to Inc FII. Two R types with resistance markers of Cm, Tc, Sm and Ap were not classified with our standard plasmids used.

Cyclotron Resonance Lineshape Function Based on the Methods of Mori and Kawabata

Abstract: The cyclotron resonance lineshape function in the electron· phonon systems is obtained by using Kawabata's approach which is based on the Kubo formalism and the Mori method of calculation. The function obtained to second order in the scattering strengh is exactly the same as Choi and Chung's lineshape function in the EWC (extremely weak coupling) scheme.

Calibrating urban residential location models 5: a comparison of trip-end and trip-interchange calibration methods

Abstract: In the previous articles in this series, the problem of calibrating residential location models has been extensively discussed. The discussion has been exclusively devoted to what may be termed trip-end calibration procedures. This was largely the result of the available data sets and the focus on multivariate multiparametric attractiveness functions. Most other authors dealt with what may be called trip-interchange calibration. This article presents a comparison of the two calibration approaches. With the use of artificial data sets to avoid obfuscation of the results, a series of calibrations were done by both techniques on thirty randomly perturbed versions of the same data set. The results show that both calibration approaches yield the same parameter values but the variances of the estimates are greater for trip-end calibration than for trip-interchange calibration. Some implications for practical application are discussed, with particular reference to the problem of consistency of trip-end and trip-...

Calibrating Urban Residential Location Models 4: Effects of Log-Collinearity on Model Calibration and Formulation:

Abstract: In extensive empirical testing of the disaggregated residential allocation model (DRAM), the Tanner function (a modified gamma function) was used as the work-trip-travel function. More recent application work with the model revealed difficulties in calibration due to log-multicollinearity, which led to a reexamination of the formulation of the model and the general question of the use of the Tanner function in spatial interaction models. An analytical examination of the Tanner function reveals that some of its desirable properties arise from phenomena different from the original hypotheses. The log-collinearity problem is also analyzed analytically. A set of numerical experiments and empirical tests confirm the analytical results and argue for discontinuing the use of the Tanner function as the trip function in spatial interaction models, and for using a negative power or a declining exponential function instead.

A study of Stictylus intermedius n. comb. with a review of the genus (Nematoda: Tylenchida)

Abstract: A light and scanning electron microscope study of a Stictylus intermedius n. comb. population from Korea led to a reappraisal of the genus. Bealius is synonymised with Stictylus with B. bisulcus and B. pissodi transferred to Stictylus, as are Anguillonema pinguicauda, A. annamari and A. leperisini as well as Hexatylus intermedius. Some of the twelve recognised species of Stictylus resemble others closely but further study of the variability of several morphological characters is necessary before synonymies can be proposed.

Available potential energy and extratropical cyclone activity during the FGGE year

Abstract: Available potential energy quantities derived using twice daily Northern Hemisphere data are compared to extratropical cyclone activity during the First GARP Global Experiment (FCGE) year. The so-called exact (isentropic) available potential energy formulations are employed, both for the entire hemisphere and within limited regions. Good agreement is indicated between cyclone tracks and hemispheric distributions of the time mean and standard deviations or eddy available potential energy contributions by individual 5° latitude—longitude areas during each season of the FGGE year. The regional available potential energies in climatologically active east coast cyclogenetic regions are shown to exceed values from less active eastern ocean regions during active periods of cyclogenesis. Also, regional available potential energy values from four Northern Hemisphere quadrants suggest that asymmetries in the land—ocean distributions of the hemisphere may be responsible for the diurnal variation in hemispheric available energy values reported in previous work. As indicated by these results, it is important to use limited region calculations when studying atmospheric features that derive their energy on scales smaller than the entire hemisphere. DOI: 10.1111/j.1600-0870.1984.tb00223.x

Effect of angiotensin II on vasopressin in plasma and platelets in SH and WKY rats.

Abstract: A study was carried out of the effects of iv angiotensin II on vasopressin release and the distribution of vasopressin between platelets and plasma in 12 week old conscious unrestrained SH and WKY rats. Angiotensin II was infused at rates of 31.25 to 500 ng/kg X min for 20 min. There was an enhanced pressor responsiveness to angiotensin II in the SH rats. Angiotensin II caused a moderate increase in plasma vasopressin concentrations, but only at doses which produced maximal pressor responses (250 to 500 ng/kg X min). There were no significant differences in vasopressin responses to angiotensin II in SH compared to WKY rats. Approximately 30% of circulating immunoreactive vasopressin was found in platelets in both SH and WKY rats, and this distribution was not greatly affected by the iv infusion of angiotensin II.

Validity of the perturbative expansions in the theories of cyclotron resonance lineshape

Abstract: Validity of the perturbative expansions dealt with in the theories of cyclotron resonance lineshape of Kawabata, Lodder-Fujita and Choi-Chung is discussed by making use of the simple mathematical induction. The expansions are proved to be valid at the resonance peaks as well as in the wings of the absorption lines.

A Survey of HBs Antigenmia among Healthy Inhabitants in Kyungpook Province, Korea

Abstract: The prevalence of hepatitis B surface antigen (HBs Ag) in various regions of the world is estimated to range from 0.1% to 15%. The area with high prevalence is the west Pacific region. The carrier rate of hepatitis B surface antigen among 1,310 healthy residents in Taegu city, Korea ws investigated in November 1982. Another sample of 729 pregant women and 43 neonates born to HBs Ag-positive mothers was tested to survey the vertical transmission of HBs Ag between mother and infant from February 1982 to May 1982. Overall prevalence of HBs Ag was 5.6% in 2,039 residents composed of 1,310 inhabitants and 729 pregnant women. The occurrence of HBs Ag was higher in males than females. The correlation between HBs Ag positivity and the socio-economic status of samples classified into residence, family numbers per room and education level of fathers indicated little of significance but the difference of the HBs AG carrier rate in the group with a surgical history was significantly higher than the group without a surgical history. Acupuncture showed no influence on the HBs Ag carrier rate. 43 of 729 pregnant womenad HBs Ag in their sera but none of their neonates were carriers of HBs Ag. Follow-up tests in 35 infants at 3 months of age and in 32 infants at 6 months of age showed seroconversion to HBs Ag positivity in one infant in each test - but it was the same infant in each case. 31 husbands of HBs Ag - positive women and 20 controls whose wives were HBs Ag - negative were examined. Only one in the control group was a carrier of HBs Ag. These data suggest that close person to person contact transmission of HBV via sexual contact and kissing, etc., are the most probable transmitting modes of HBV if one has susceptibility.

Massive vector superfields with SU(2) internal symmetry

Abstract: A Lagrangian for massive vector superfields is constructed in such a way that it can be related to the ordinary field equations for the constituent fields, and eliminate the ghost terms.