• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.27 no.3
• /
• pp.292-298
• /
• 1994

An environmental study was done to examine the distribution of Vibrio mimicus in aquatic environments of Kwangan and Minrak beach, Pusan, Korea. Moreover, both bacteriological characteristics and lethal effects of isolated V. mimicus were observed. Sea water samples were collected monthly from January to September, 1993, and quantitatively analyzed for V. mimicus. This organism was isolated from April(water temperature was $16.3^{\circ}C$), whereas it was not isolated when the water temperature fell below $15^{\circ}C$. V. mimicus counts were not remarkably high, however this study at least describes the distribution and occurrence of the possible highest density in aquatic environments of this region. Among the confirmed V. mimicus strains, the author chose the strongest antibiotic resistant bacterium and named it V. mimicus K-1. This strain has antibiotic resistance to colistin, erythromycin, tetracycline, and penicillin, and most isolates had a higher level of antibiotic resistance than V. mimicus ATCC 33653. The optimum growth for V. mimicus K-1 was observed at $37^{\circ}C$, pH 7.5, and $1\%$ NaCl, respectively. This organism was mostly inactivated by Ultra Violet irradiation (30W, $50^{\circ}C$) for 70 seconds and death lethality increased in proportion to treatment temperature ($D_{50}=5.7min,\;D_{60}=\;2.1min,\;and\;D_{70}=0.7min$).

• 한국생물공학회:학술대회논문집
• /
• 2000.11a
• /
• pp.435-438
• /
• 2000

Crude oil-degrading microorganisms, Acinetobacter sp. A132, Pseudomonas aeruginosa F722, and Acinetobacter calcoaceticus OM1 were isolated from soil and sea. The optimal temperature of strain A132 and strain F722 on growth isolated from soil was $35^{\circ}C$ both, and also their growth were optimized at pH 8 and 9, respectively. The growth of the strains, A132 and F722, showed that crude oil of 2% (w/v) in culture broth in which crude oil was used as carbon and energy sources appeared to be an optimum. Optimal culture conditions of strain OM1 were different from those of the soil microorganisms except for temperature. The growth of strain OM1 was optimized at pH 7 and crude oil of 3.0% (w/v). The degradability to crude oil by strain A132 showed maximum $5.49g/\;l\;{\cdot}\;day$ under the conditions of $25^{\circ}C$, NaCl of 1.0% (w/v), and crude oil of 2.0% (w/v). The highest degradability of strain F722 to crude oil was $1.19g/\;l\;{\cdot}\;day$ under the culture conditions at $35^{\circ}C$, NaCl 1.0% (w/v), and crude oil of 2.0% (w/v). The degradation characteristics of kerosene $(nC_9-nC_{20})$ and diesel $(nC_9-nC_{28})$ by strain OM1, and F722 were analyzed by gas chromatography. Strain OM1 degraded more than 95% of kerosene and 75% of diesel for 7 days cultivation. Strain F722 showed degradation of more than 80% to kerosene in 10 days.

• Korean Journal of Crystallography
• /
• v.17 no.1
• /
• pp.24-32
• /
• 2006

The microwave dielectric properties of $Zn_3Nb_2O_8\;with\;V_2O_5$ addition were investigated. The addition of $V_2O_5$ enhanced the sinterability of $Zn_3Nb_2O_8$, which resulted in high density of $Zn_3Nb_2O_8$ ceramic greater than 95% of the theoretical value when sintered at $900^{\circ}C$ for 4 hours. X-ray diffraction analysis of sintered $Zn_3Nb_2O_8$ ceramic showed no second phase with $V_2O_5$ addition. Dielectric permittivity(${\varepsilon}_r$) and quality factor($Q{\times}f$) varied with both density at different sintering temperature and $V_2O_5$ addition. Dielectric permittivity, quality factor and temperature coefficient($T_{cf}$) of the two mole of $V_2O_5\;added\;Zn_3Nb_2O_8$ that was sintered at $900^{\circ}C$ were 21.4, 40,000, $-54ppm/^{\circ}C$, respectively.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.28 no.1
• /
• pp.60-66
• /
• 1995

Vibrio cholerae non-O1 and Vibrio mimicus, food poisoning bacteria, have detected frequently in fresh water and brackish water. To estabilsh prevention measures of food poisoning outbreak by these bacteria, the adaptability and population changes were examined in fresh water, brackish water $(10\%o\;NaCl)$ and seawater $(30\%o\;NaCl)$. Both species poorly survived as temperature increased regardless of water types employed. However, survival time was the shortest in fresh water and longest in seawater at $4^{\circ}C$. In case of brackish water, the bacteria survived best at $15^{\circ}C$ and population were varied only in small numbers. Any significant difference was not observed to both species with respect to water types and temperatures except V. mimicus survived about 5-6 days longer in brackish water. In conclusion, V. cholerae non-O1 and V. mimicus were not likely to be recovered In normal fresh water, brackish water and seawater, and both biological and physicochemical factors could affect survival of these species.

• Proceedings of the Korean Vacuum Society Conference
• /
• 1999.07a
• /
• pp.87-87
• /
• 1999

본 연구에서는 Pulsed Laser Deposition(이하 PDL)방법을 이용하여 Si기판에 (Ba,Sr)TiO3(이하 BST)박막을 MFS-FET(Metal-Ferroelectric-Semiconductor Field-effect Transistor)구조로 제조하였으며 BST박막의 강유전성이 BST 박막에 유도되는 응력에 어떤 영향을 받는지 살펴보았다. 본 연구에서는 완충막을 사용함으로써 BST박막과 완충막간의 격자부정합을 이용하여 BST박막에 강유전성을 유도하려고 하였다. 또한 MFS-FET구조의 BST박막에 유도되는 응력조절을 위하여 BST박막과 완충막의 두께를 변화하였으며 XRD를 통한 구조 분석 및 C-V test를 통한 전기적 특성을 관찰을 하였다. PLD법을 통해서 epitaxial 성장된 BST 박막에서는 Si에 epitaxial 성장된 완충막과의 격자부정합에 의한 BST박막내의 자발분극의 발생이 예상된다. 따라서, 본 연구는 강유전체의 자발분극에 의하여 발생되는 C-V 이력현상이 BST박막과 완충막과의 격자부정합에 의한 응력에 의해 발생될 것으로 예상하여, BST 박막에 유도되는 응력과 C-V 이력현상의 관계를 통하여 상온에서 상유전성을 갖는 BST가 응력에 의하여 어느 정도의 강유전성을 나타내는지를 밝히기 위해 진행되었다. 본 연구에서 사용된 완충막은 YSZ(Yttria Stabilized Zirconia)박막으로 0.4mTorrO2 분위기 하에서 600~80$0^{\circ}C$의 온도에서 증착하여 상형성을 살펴보았고 $700^{\circ}C$에서 epitaxial 성장을 확인하였으며 두께는 30~$\AA$으로 변화하였다. 또한 BST박막은 완충막과의 전압분배를 고려해 300~2000$\AA$으로 두께를 변화를 시키며 증착하였다. MFS 구조에서 Al 전극을 사용하여 완충막과 BST박막간의 두께 변화에 따른 Capacitance - Voltage(C-V) 측정을 하였으며 이를 통하여 강유전상의 특성인 C-V 이력현상을 관찰하였다. 그 결과 YSZ 박막에서는 C-V 이력현상이 나타나지 않았으며 BST 박막에서는 약 1.2V의 C-V이력현상이 보였다.

• Journal of Chest Surgery
• /
• v.17 no.2
• /
• pp.177-183
• /
• 1984

From July 1975 to March 1984, 16 patients of complex congenital cardiovascular anomalies associated with left superior vena cava were seen at Han-Yang University Hospital. The age of patients was ranged from 2 to 15 years-old. The distribution of Sex was 7 patients in male, 9 patients in female. Persistent Left Superior Vena Cava [L.S.V.C.] was classified according to the proximal connection of L.S.V.C. into 3 groups. Group I which L.S.V.C. connected to coronary venous sinus was in 9 patients, Group II which L.S.V.C. connected to Left atrium was in 5 patients, Group III which L.S.V.C. hemodynamically connected to right atrium was in 2 patients. Pathoanatomical findings of complex congenital cardiovascular anomalies associated with L.S.V.C. in 16 cases were generally show unsystematic irregularity. In group I, A.S.D. were only in 3 cases, but in highest incidence and in group III, all two cases were supracardiac type of total anomalous drainage of pulmonary veins. Post-operatively, 3 patients among 14 patients of total correction, were died immediately, 1 patient of palliative shunt operation was died after 2 and half years, and Follow-up results of other remaining patients were excellent.

• Journal of Radiation Protection and Research
• /
• v.26 no.3
• /
• pp.287-290
• /
• 2001

The 9.17MeV gamma-rays from the $^{13}C(p,\;{\gamma})^{14}N,\;^{14}N({\gamma},\;{\gamma})^{14}N$ reactions were measured. The incident 9.17MeV gamma-ray was produced from the $^{13}C(p,\;{\gamma})^{14}N$ reaction at Ep=1.75MeV resonance. The 1.75MeV proton beam was accelerated using the 3MV SNU-AMS Tandetron and 1.7MV KIGAM Tandem accelerators. The enriched 13C target was $121{\mu}g/cm^2$ self-supporting foil, and we used liquid nitrogen as a resonant absorption target. We used a HP-Ge detector with 30% efficiency and less 2keV energy resolution. We developed new method to detect the scattered 9.17MeV gamma-ray from the nitrogen target by using the energy difference between the Doppler shifted gamma-ray from the $^{13}C(p,\;{\gamma})^{14}N$ reaction and the resonant absorbed and rescattered gamma-ray from the $^{14}N({\gamma},\;{\gamma})^{14}N$ reaction.

• Journal of Physiology & Pathology in Korean Medicine
• /
• v.23 no.4
• /
• pp.925-932
• /
• 2009

The purpose of this study is to evaluate factors that have correlation with improvement of Cerebrovascular accidents(C.V.A) and to decide ranking of influence about improvement of C.V.A. This observation was made on 153 subjects of C.V.A. that were diagnosed through brain MRI or brain CT. They were hospitalized in the Semyung University Oriental Medicine Hospital from the January 1st 2006 to December 31th 2007. The subjects of this study are divided into two groups. The one group has slight motor disturbance, and the other group has severer motor disturbance. Based on medical treatment chart, we analyze differences of many factors like past history, family history, drinking, smoking, several symptoms with C.V.A., etc between two groups. As a result, The past history of cerebrovascular disease and past history of hypertension are the most influencing factors in improvement of C.V.A.

• Journal of the Korean Society of Tobacco Science
• /
• v.25 no.2
• /
• pp.95-102
• /
• 2003

To get the informations of quality uniformity of threshed burley tobacco produced from 1997 to 2001 and processed at various leaf processing factories, chemical constituents contents and coefficient of variation(C.V.) were analysed. The average chemical constituents contents of 12 grades during 5 years ranged as follows; nicotine 1.76～2.66%, total nitrogen 4.15～4.80%, crude ash 21.6～22.4% and chlorine 1.08～1.20%. The variations of chemical constituents contents among crop years was higher in nicotine while lower in crude ash. The nicotine content of upper leaves were influenced negatively by rainfalls, while total nitrogen content were influenced positively by air temperature and sunshine hours during July. The C.V. of chemical content in same grade was higher in chlorine and nicotine while lower in crude ash. The ratio of C.V. among leaf tobacco processing factories/C.V. of total sample in same grade was high in nicotine. To reduce the C.V. of chemical constituents, it is recommendable to thresh the leaf tobacco at one processing factory. When the leaves being processed at one factory, the decreasing effect of deviation was higher in nicotine, particularly.

• Journal of Sensor Science and Technology
• /
• v.4 no.3
• /
• pp.15-21
• /
• 1995

In this paper, $TiO_{2}-V_{2}O_{5}$ humidity sensors are fabricated by Sol-Gel method. For the establishment of optimum processing condition which is good humidity sensitive characteristics for specimens, their microstructures and crystalline-structures are analysed. Grain size increases with substitution rate of $V^{5+}$ on $Ti^{4+}$ site. From the analysis of XRD, $V^{5+}$ peak can't confirm with $V_{2}O_{5}$ rate. Their humidity sensitive characteristics is good at 1mol% of $V_{2}O_{5}$ rate and heat-treated at $700^{\circ}C$. The capacitance of specimens decreases with frequency.