Showing papers by "Yonsei University published in 1984"
TL;DR: In this paper, the authors explored the development of the overseas manufacturing direct investment by Korean firms and the relationship between parent firms and overseas affiliates, and three main issues are discussed: the ownership-specific assets, location-specific factors, and government policies.
Abstract: As an extension of the export-led growth of national economy overseas, direct investment by Korean multinationals has been rapidly increasing. This article explores the development of the overseas manufacturing direct investment by Korean firms and the relationship between parent firms and overseas affiliates. Three main issues are discussed: the ownership-specific assets, location-specific factors, and government policies are the important sets of variables that help to explain the internationalization of the Korean firms in the manufacturing sector, the nature of technology transfer by Korean multinationals to their subsidiaries, and the benefits as a result of its overseas investment to Korean. The data for this study were gathered through structured interviews with the parent companies of 18 out of 21 manufacturing overseas subsidiaries and joint ventures formed by Korean firms.
61 citations
01 Aug 1984
TL;DR: In this article, the authors pose a somewhat broader entropy maximization problem, in which stationarity and normality are not assumed, and shift the burden of proof from the previous focus on the calculus of variations and time series techniques to a string of information-theoretic inequalities.
Abstract: It is known that the maximum entropy stationary Gaussian stochastic process, subject to a finite number of autocorrelation constraints, is the Gauss-Markov process of appropriate order The associated spectrum is Burg's maximum entropy spectral density We pose a somewhat broader entropy maximization problem, in which stationarity and normality are not assumed, and shift the burden of proof from the previous focus on the calculus of variations and time series techniques to a string of information-theoretic inequalities This results in an elementary proof of greater generality
51 citations
TL;DR: In this paper, the electrical conductivities of polycrystalline TiO2 samples were measured at temperatures from room to 600°C under partial pressures of oxygen from 10−6 to 10−1m.
40 citations
TL;DR: A patient, a 27-year-old Korean woman, resident in Seoul, Korea, presented with nausea, vomiting, and epigastric tenderness and a palpable mass was discovered in the right iliac fossa, which proved to be an inflammatory reaction containing numerous tracts made by the migrating fluke.
Abstract: A case of ectopic human Fasciola spp. infection in the cecal wall is reported. The patient, a 27-year-old Korean woman, resident in Seoul, Korea, presented with nausea, vomiting, and epigastric tenderness. One week later a palpable mass was discovered in the right iliac fossa. A clinical dia
27 citations
TL;DR: DNCB treated patients with verrucae with dinitrochlorobenzene as a topical application on the normal uninvolved skin of the shoulder for sensitization and challenge cured more than 90% of the patients cured by challenge.
Abstract: Fifty-nine patients with verrucae (45 with verrucae plana and 14 with verrucae vulgaris) were treated with dinitrochlorobenzene (DNCB) as a topical application on the normal uninvolved skin of the shoulder for sensitization and challenge. The patients were sensitized with 0.5 ml of 0.4% DNCB solution and then challenged with 0.1% DNCB ointment twice a week. Six cases of verrucae plana and 1 case of verrucae vulgaris were completely cured by sensitization only and 32 cases of verrucae plana and 7 cases of verrucae vulgaris were completely resolved by repeated challenges. The therapeutic effect was better in verrucae plana (84.4%) than in verrucae vulgaris (57.1%), and the verrucae were completely resolved within 10 weeks in more than 90% of the patients cured by challenge. The side effects of DNCB were mild allergic contact dermatitis and slight transitory hyperpigmentation at the site of application.
23 citations
14 citations
TL;DR: The data indicate that HTC-AZH and -TAS can be used to identify previously undefined splits or variants of lymphocyte-defined (LD) determinants associated with DR2 and DR4 haplotypes and provides additional evidence of heterogeneity within the family of serologically-defined HLA-DR haplotypes.
Abstract: Two newly-identified HLA-D antigens were characterized by testing selected homozygous typing cells (HTC) against responder panels derived from Caucasian, Korean, Alaskan Eskimo and Israeli Jewish populations. The first specificity, defined by typing cell "AZH", is associated with DR2 haplotypes and is detected primarily in Israelis. The second specificity, defined by HTC "TAS", is associated with DR4 haplotypes and is detected with relatively high frequency in Koreans and Alaskan Eskimos. The data indicate that HTC-AZH and -TAS can be used to identify previously undefined splits or variants of lymphocyte-defined (LD) determinants associated with DR2 and DR4 haplotypes. Further, the study demonstrates the utility of comparative population analysis in identifying and characterizing alleles encoded by the HLA-D region and provides additional evidence of heterogeneity within the family of serologically-defined HLA-DR haplotypes.
13 citations
TL;DR: The results of this survey indicated that the middle reaches of Ohsip-stream in Miro-myon, Samcheok-gun is the endemic region for M. yokogawai infection.
Abstract: An epidemiological study on Metagonimus yokogawai infection was performed in Samcheok-gun, Kangwon province during the period from November 1983 to October 1984. Formalin-ether concentration technique and Stoll's dilution egg counting method were employed to figure out the prevalence and infection intensity of M. yokogawai infection. The results are summarized as follows: The prevalence of M. yokogawai infection was 13.3 % among 1,172 examined; 18.0 % (114 out of 632) in male and 7.8 % (42 out of 540) in female. The prevalence rates were different by stream; 15.5 % in Ohsip-chon (stream), 11.8 % in Maeup-chon and 1.6 percent in Gagok-chon. Along the basin of Oship-chon; 8.2 % at the lower reaches in Samcheok-eup, 25.9 % at the middle reaches in Miro-myon and 6.2 % at the upper reaches in Dogeoe-eup, respectively. By age group, the highest rate (18.3~20.2 %) was observed in 30~49 years of age (male : 24.1~28.7 %, female 11.2~13.2 %). By social strata, the positive rate was 15.0 % (120 out of 799) in general inhabitants and 9.7 % (36 out of 373) in school children. Intensity by EPG count in feces was 419 in average; the light infection (less than 400 EPG) was 70.4 %, moderate infection (401~1,000 EPG) 19.4 % and heavy infection (more than 1,001 EPG) 10.2 percent respectively. All the 67 sweetfish (length 10.3~18.5 cm) which were caught from Ohsip-stream were infected with metacercariae of M. yokogawai and the number of metacercariae detected were 382 per fish in average (323 in June and 382 in September). Experiences of intake of raw fresh-water fish [Plecoglossus altivelis and Leuciscus (Tribolodon) sp.] were present in 50.3 % (354 out of 704) of the inhabitants along Ohsip-stream according to questionnaire study. The results of this survey indicated that the middle reaches of Ohsip-stream in Miro-myon, Samcheok-gun is the endemic region for M. yokogawai infection.
12 citations
TL;DR: As part of a community‐based study in Korea to evaluate the effects of previous induced abortion on length of gestation and pregnancy outcome of subsequent pregnancies, data obtained from January 1979 to December 1981 on pregnancies reported to family health workers in Kang Hwa Island were analyzed.
10 citations
TL;DR: In this paper, the electrical conductivity of polycrystalline samarium sesquioxide was measured in the temperature range 300-1000°C under oxygen pressures of 10 −5 −10 −1 atm.
9 citations
TL;DR: In this article, the authors considered the quantum systems of interacting Bose particles confined to a bounded region Λ of the configuration spaces ℝv and obtained bounds on exponentials of local number operators for any temperature and activity.
Abstract: We consider the quantum systems of interacting Bose particles confined to a bounded region Λ of the configuration spaces ℝv. For a class of superstable interactions we obtain bounds on exponentials of local number operators for any temperature and activity. The method we use is the Wiener integral formalism in statistical mechanics. As a consequence any thermodynamic limit states are entire analytic and locally normal in the CCR algebra. In some cases these are modular states.
TL;DR: In the Japanese greater horseshoe bat, Rhinolophus ferrumequinum nippon, a vast number of spermatozoa invade the oviducal epithelial cells of the caudal isthmus and become concentrated in the endometrial lamina propria of the bicornuate horns.
Abstract: In the Japanese greater horseshoe bat, Rhinolophus ferrumequinum nippon, a vast number of spermatozoa invade the oviducal epithelial cells of the caudal isthmus and become concentrated in the endometrial lamina propria of the bicornuate horns. They are subsequently phagocytised and digested by fibroblasts. Then, finally, they become deposited in the uterine lumen together with a large quantity of secretory material from the endometrial connective tissue which, prior to this event, undergoes a massive infiltration by polymorphonuclear leucocytes.
TL;DR: The 2,2′-diaminobiphenyl ligand exhibits complete stereospecificity in its coordination to platinum(II) ion with λ chiral conformation.
TL;DR: Prevalences of intestinal protozoa in Gyeong-gi Do and Jeonra Bug Do decreased remarkably in comparison with those of one decade before, however, economic level, academic career and anthelmintic administration seemed no essential reasons for such declination.
Abstract: The present study was designed to elucidate the recent prevalence of the intestinal protozoa and to demonstrate the relationship on prevalence of the surveyed population with their academic career and living conditions. During the period from May to July 1981, total 2,735 fecal specimens were collected from the inhabitants of 11 areas in Gyeong-gi Do (province) near by Seoul City, and 6 areas in Jeonra Bug Do, southwestern part of Korea. The samples were fixed with SAF solution and were examined by formalin-ether sedimentation technique. The results are summarized as follows: Overall positive rate of intestinal protozoa was 11.1 %: Gyeong-gi Do, 10.7 %; Jeonra Bug Do, 11.7 %. Five species of intestinal protozoa were detected: Entamoeba histolytica 0.69 %, Entamoeba coli 5.52 percent, Endolimax nana 2.71 %, Giardia lamblia 2.23 %, Iodamoeba butschlii 0.l8 %. Highest positive rates among the examined areas were recognized: Incheon City of Gyeong-gi Do, 26.7 %; Im-sil Gun(county) of Jeonra Bug Do, 19.9 %. By species, E. nana showed the highest prevalence rate (13.74 %) in Incheon City, and E. histolytica (2.37 %) and E. coli (9.95 %) in Im-sil Gun. Prevalence of E. histolytica in rural areas was higher than in urban areas. No significant difference in the prevalence rate by sex and age was recognized, although the group under 10 years and over 60 years were lower than in other age groups. The highest positive rate of E. histolytica was observed in pauper group and significant linearity of prevalence rate of E. histolytica by monthly income was observed. The inhabitants who used conventional latrine showed higher prevalence, 11.5 %, than the group of inhabitants who used modified privy. Although no significant difference of positive rate was recognized by academic career, but the lowest prevalence rate was observed in college graduates. Over half of the surveyed population, 64.8 % has no experience on anthelmintic practice. Number of anthelmintic application resulted no difference in prevalence. In conclusion, prevalences of intestinal protozoa in Gyeong-gi Do and Jeonra Bug Do decreased remarkably in comparison with those of one decade before. However, economic level, academic career and anthelmintic administration seemed no essential reasons for such declination.
TL;DR: Etude du mecanisme par lequel le lycoricidinol isole des bulbes de lycoris radiata supprime l'induction de la production d'ethylene par l'auxine chez Vigna radiata.
Abstract: Etude du mecanisme par lequel le lycoricidinol isole des bulbes de lycoris radiata supprime l'induction de la production d'ethylene par l'auxine chez Vigna radiata
TL;DR: The present study aimed to determine the number, distribution pattern and structure of the sensory papillae of Metagonimus yokogawai cercariae, and to elucidate the chaetotaxy of this digenetic trematode.
Abstract: A number of studies on the papillae of cercariae of trematodes reported that the papillar patterns (or chaetotaxy) of cercariae might be an excellent method to attain better understanding of the digenetic trematodes (Richard, 1971; Short and Cartrett, 1973; Bayssade-Dufour, 1979). The present study was aimed to determine the number, distribution pattern and structure of the sensory papillae of Metagonimus yokogawai cercariae, and to elucidate the chaetotaxy of this digenetic trematode. M. yokogawai cercariae were pipetted from a vial in which infected snails (Semisulcospira libertica) had been kept for 3 hours. The snails were collected from an endemic area of M. yokogawai, Boseong river in west-southern part of Korea. Observations of papillae were based on light microscopy of those stained with silver nitrate, and on scanning electron microscopy. The results are summarized as follows: All papillae observed were uniciliated. Cilia in anterior tip were shorter than the others in other portions. The body papillae were arranged in essentially symmetrical patterns. Total number of the papillae was 126(63 pairs) in average; anterior tip 40(20 pairs), ventral 20(10 pairs), lateral 42(21 pairs), and caudal 8(4 pairs). The chaetotaxy of M. yokogawai cercaria was; C(I) cycle (3+3C(I)V, 2+2C(I)L, 2+3C(I)D), C(II) cycle(2C(II)V, 1C(II)L, 2C(II)D), C(III) cycle (1+lC(III)V, 1C(III)L), C(IV) cycle (1C(IV)V, 1C(IV)L) in cephalic region: A(I)(lA(I)V, l+2A(I)L, 1A(I)D), A(II)(1A(II)V, 1+3A(II)L, lA(II)D), A(III) {lA(III)V, l+lA(III)L, lA(III)D) and A(IV)(lA(IV)V, 2A(IV)L) in antacetabular region: 1M(I)V and 2M(I)L in median: 1+lP(I)L, 1P(II)L, lP(II)D lP(III)L, lP(IV)L and 1P(IV)D in postacetabular region: 2-2-2-2 in caudal region.
TL;DR: In this paper, the authors investigated the oxidation of carbon monoxide by gaseous oxygen in the presence of a powdered Cd-doped La/sub 2/O/sub 3/ catalyst.
TL;DR: Performance with the contoured stereograms is better than with the random-dot stereograms in terms of both speed and accuracy and a rapid reduction in reaction time over practice occurs for both types of stereograms.
Abstract: Three experiments were performed to investigate the role of vergence and the relationship between form and depth processes in global steropsis by comparing global and classical stereopsis. In the first experiment, the speed of stereoscopic resolution as a function of initial fixation-target distance was measured to discover the role of vergence in stereopsis with the random-dot and contoured stereograms. In the second experiment, the accuracy of form and depth discrimination as a function of fixation-target distance was measured using brief stimulus exposure (150 ms) to examine the nature of form and depth processing in global stereopsis. In the third experiment, the speed of resolving random-dot stereograms in the presence or absence of juxtaposed contoured stereograms was observed to examine the interaction of global stereopsis and classical stereopsis. The conclusions of these studies are summarized as follows: First, vergence plays a critical role in the solution of the random-dot stereograms but not in the solution of contoured stereograms. Second, performance with the contoured stereograms is better than with the random-dot stereograms in terms of both speed and accuracy. Third, in random-dot stereograms, discrimination of form is independent of and more accurate than discrimination of depth. Fourth, again for random-dot stereograms, the disparity of target relative to fixation systematically affects discrimination of form but not discrimination of depth. Fifth, a rapid reduction in reaction time over practice occurs for both types of stereograms. Finally, strong interference with the solution of the random-dot stereograms by the monocular contour occurs when the two kinds of stimuli are present simultaneously. Language: en
TL;DR: In this article, it was shown that vanadium impurities profoundly affect both the crystallographic and spin-rotation transitions of iron sulfide and the separation between the spin rotation and the $\ensuremath{\alpha}$-transition temperatures increases by as much as 114 K compared with that for iron sulfides.
Abstract: It is found by M\"ossbauer measurements on ${\mathrm{V}}_{x}{\mathrm{Fe}}_{1\ensuremath{-}x}\mathrm{S}$ that the vanadium impurities profoundly affect both the crystallographic and spin-rotation transitions of iron sulfide. When the vanadium concentration is increased to 2.5% of the metal atoms, the crystallographic $\ensuremath{\alpha}$ transition proceeds an order of magnitude more rapidly than for iron sulfide, and the separation between the spin rotation and the $\ensuremath{\alpha}$-transition temperatures increases by as much as 114 K compared with that for iron sulfide. The Morin transition temperature for ${\mathrm{V}}_{0.025}$${\mathrm{Fe}}_{0.975}$S was measured as 486 K, which is 86 K higher than the $\ensuremath{\alpha}$-transition temperature. It was also found that the $\ensuremath{\alpha}$ transition for ${\mathrm{V}}_{0.025}$${\mathrm{Fe}}_{0.975}$S has a hysteresis width of 4 K.
TL;DR: The laboratory data revealed a hemolytic anemia with thrombocytopenia, hyperbilirubinemia and increased hepatic enzyme values, which is the frst description of congenital malaria in Korea imported from Uppervolta in Africa.
Abstract: A case of congenital malaria infection has been studied in a 46-day old female Korean infant. Her mother suffered from malaria infection during pregnancy in Uppervolta, Africa, and returned to Korea at the 9th month of gestation for delivery. At 39 days of age, the clinical features characterized by fever, irritability, pallor, jaundice and hepatosplenomegaly were developed. The laboratory data revealed a hemolytic anemia with thrombocytopenia, hyperbilirubinemia and increased hepatic enzyme values. A peripheral blood smear demonstrated intraerythrocytic malarial parasites snd gametocytes of Plasmodium falcifarum. She was successfully treated with quinine sulfate (25 mg/kg/day in three doses for 5 days) and trimethoprim/sulfamethoxazole (8 mg/kg/day in two doses for 5 days) orally, and repeated blood smear had been negative for malaria. This report also signifies the frst description of congenital malaria in Korea imported from Uppervolta in Africa. A brief review of related literature was made.
TL;DR: In this article, the hip joints of 20 young rapidly growing dogs were subjected to eversion of the acetabular labrum, and the femoral head gradually subluxed but never dislocated.
Abstract: To investigate adverse effects of acetabular labrumectomy on the growth and development of the acetabulum, the author subjected the hip joints of 20 young rapidly growing dogs to eversion of the acetabular labrum. It was found to produce acetabular dysplasia. The acetabulum gradually became shallower and more vertically oriented, and the femoral head gradually subluxed but never dislocated. The radiographic appearance of the hip dysplasia was similar to that seen in humans. Histologically, a substantial degenerative change in articular cartilage was observed in the subluxed hip, without any evidence of degenerative arthritis radiologically. When operating on congenital dislocation of the hip, a complete excision or eversion of the acetabular labrum should be avoided. Radial splitting of the acetabular labrum may safely avoid the risk of violating the acetabular epiphyseal cartilage.
TL;DR: Comparative observation of the ultrastructure of the amoebas in axenic culture and experimentally infected mice brain was done with transmission electron microscope, suggesting a strong phagocytic activity in Naegleria fowleri trophozoite.
Abstract: Present study was undertaken to elucidate the changes of the ultrastructure of Naegleria fowleri trophozoite in brain tissue of mice and culture medium. Naegleria fowleri, 0359 strain, which used in this study was cultured in axenic liquid medium, CGVS medium. Each mouse was inoculated with 1 x 10(5) amoebas intranasally under secobarbital anesthesia, and sacrificed on 7th day after the infection. Comparative observation of the ultrastructure of the amoebas in axenic culture and experimentally infected mice brain was done with transmission electron microscope. The results are summarized as follows: 1. The amoebas in mouse brain tissue were round in outline, whereas those of amoebas from axenic culture showed irregular appearance. 2. Mitochondria in the amoebas from axenic culture was oval, round and cylindrical shape and darkly stained, whereas those of the amoebas from mouse brain tissue showed dumbbell shape together with above forms. The stain was not unique, but light and/or dark. 3. Rough endoplasmic reticulum of amoebas in brain tissue was tubular, but from culture it was vesicular or tubular in shape. 4. Empty vacuoles were demonstrated in amoebas from culture, while food vacuoles with myelinated structures were abundant in those from tissue, suggesting a strong phagocytic activity. 5. Mouse brain tissue infected were extensively destroyed, and polymorphonuclear leukocytes were infiltrated predominantly with inflammatory lesion. Amoebas were observed in the vicinity of the capillary.
TL;DR: In this paper, the one-loop corrections to the QED Green's functions are considered to show that, although the electron mass and wave function are dependent on temperature, the electric charge is not affected by the temperature.
TL;DR: The x values of the nonstoichiometric chemical formula, EuO1, have been measured in the temperature range from room temperature to 1100°C under 2 × 10−1 atm and 10−2 atm oxygen pressures, and were found to vary between 1.5171 and 1.5927 as discussed by the authors.
TL;DR: In this paper, the phenomenological magnetic form factors of bound nucleons were calculated with the Cohen-Kurath wave functions, and the effects of meson exchange currents on the EM form factors were also investigated.