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Hong, S.H.,Lee, S.E.,Jeong, Y.I.,Kim, H.C.,Chong, S.T.,Klein, T.A.,Song, J.W.,Gu, S.H.,Cho, S.H.,Lee, W.J. Elsevier Scientific Pub. Co 2014 Veterinary parasitology Vol.205 No.3
A survey was conducted to determine the distribution and prevalence of Toxoplasma gondii and Babesia microti infections in small mammals captured in Gyeonggi and Gangwon Provinces, Republic of Korea (ROK). The serological prevalence of T. gondii (ELISA) and B. microti (IFAT) was 2.3% (15/667) and 2.1% (14/667), respectively. DNA extracts from small mammal heart tissues were screened by PCR for T. gondii and B. microti targeting regions of the GRA5 gene and the 18S rRNA and β-tubulin genes, respectively. Only 0.17% (1/578) of Apodemus agrarius was positive of T. gondii by PCR, while 0.52% (3/578) was positive of B. microti. All other small mammal species [Micromys minutus (16), Mus musculus (3), Myodes regulus (22), Microtus fortis (6), and Crocidura lasiura (42)] were negative for both T. gondii and B. microti. Based on sequence polymorphism and phylogenetic analysis, T. gondii closely aligned with Type I, a highly virulent strain, while B. microti positive samples closely aligned with US-type B. microti and others observed in the ROK, Russia, and Japan. These results indicate that A. agrarius is a reservoir for both T. gondii and B. microti in the ROK.
정형환,이준탁,김해재,정동일 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1
This paper presents a Fuzzy Control Technique to improve the load frequency control dynamics of a power system for a given stepwise load perturbation. A related simulation results follow and show that the optimized rules by the proposed technique are very effective for reduction of overshoot and deviation of load frequency in steady-state, and for minimization of settling time.
EFFECTS OF THE REMOTE H-PLASMA TREATMENTS FOR THE REMOVAL OF CU IMPURITY ON SI SUBSTRATE
Ahn, T. H.,Park, M. G.,Ryoo, Kun-Kul,Lee, Chong-Moo,Jeon-Tag, Hyeong-Tag 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.2 No.e1
Removal of Cu impurity from Si surfaces was investigated. Cu impurity on Si surface was contaminated interntionally by dipping into the standard 1ppm CuC$l_2$ chemical solution. The H-plasma treatments were conducted to remove Cu impurity depending on the rf powers, exposure times and remote distances. After these H-plasma treatments, Si surfaces were analyzed by using TXRF(total X-ray reflection fluorescence) and AFM(atomic force microscope). The concentration of Cu which was intentionally contaminated was about $10^{13}$ atoms/c$m^2$ and its surface roughness(root mean square) was around 2.7$\AA$. The Cu concentration and surface roughness were imporved after H-plasma cleaning. The Cu comcentration was reduced more than a factor of 10 and its surface roughness showed more than 30% improvement. This removal mechanism was tried to expain by applying the lift-off phenomena accompanied with the removal of a oxide and Cu impurity.
고속 분할법에 의한 교류-직류 전력계통의 조류계산에 관한연구
안병철,정형환,이권순,이준탁,정동일,왕용필 東亞大學校 海洋資源硏究所 1992 硏究論文集 Vol.5 No.1
The active and reactive power transfers to and from nodes connected to h.v.d.c. links do not obey the general rules of a.c. power transmission, the active power is independent of phase angle relationships and the reactive power is not directly related to voltage variation. Under such circumstances it is difficult to visualize h.v.d.c. model compatible with the behaviour of the fast decoupled algorithm. However, acknowledging the general acceptance of fast decoupled programes and the existence of some h.v.d.c. links(particularly considering their large power-carrying capacitors) a model of the h.v.d.c. transmission link suitable for incorporation with fast decoupled loadflow programes is described in the following sections.
Piezoelectric and Dielectric Properties of Lead-Free (1-x)(Bi0.5K0.5)TiO3-xBiFeO3 Ceramics
Kim, J. M.,Sung, Y. S.,Cho, J. H.,Song, T. K.,Kim, M. H.,Chong, H. H.,Park, T. G.,Do, D.,Kim, S. S. Taylor Francis 2010 Ferroelectrics Vol.404 No.1
<P>Dielectric and piezoelectric properties of lead-free (1-x)(Bi0.5K0.5)TiO3-xBiFeO(3) ceramics prepared by a conventional solid-state reaction method were studied in the range of x = 0 similar to 40 mol%. A tetragonal perovskite structure was maintained at x = 0 similar to 10 mol% forming a solid solution between (Bi0.5K0.5)TiO3 and BiFeO3 with no secondary phase. Piezoelectric coefficient (d(33)) increased from 31 pC/N at x = 0 mol% to 64 pC/N at x = 6 mol% and then decreased with further addition of x. Depolarization temperature (T-d) gradually decreased with increasing x from 302 degrees C at x = 0 mol% to 163 degrees C at x = 20 mol% and slightly increased up 180 degrees C at x = 40 mol%.</P>
김준언,이채언,문덕환,김진옥,하회영,윤병용,배기택,김용완,전종휘 인제대학교 1982 仁濟醫學 Vol.3 No.2
부산지역 일부 섬유, 고무 및 제강 산업장의 소음 작업부서 종사 근로자들중 6분법에 의한 청력장애(21dB이상)자는 조사대상의 6.30%이었다. Authors surveyed on the status of prevalence and several characters related with the occurrence of noise induced hearing impairment on 2,963 numbers of workers engaged in noisy department of twelve industries which were Textile, Rubber and Steel-Wire in Busan from July 1st, 1980 to September 30th, 1981. The obtained results were as follows: 1.About 90 percent of workers in noisy department engaged in the place of noise level less than 100dB(A). 2.The prevalence of occupational healing loss of workers engaged in noisy department by each level of hearing loss was respectively 5.43 percent at 21dB and above. 2.53 percent at 31dB and above, 0.80 percent at 41dB and above. 3.Workers of noise induced hearing impairment showed typical Cs-dip in Audiogram. 4.About 80 percent and above of workers of noise induced hearing impairment determined hearing loss of 40dB and below. 5.Hearing loss of workers of noise induced hearing impairment increased with aging. 6.Hearing loss of workers of noise induced hearing impairment was in accordance with the duration of employment in 7 years and below. 7.The occurred rate of noise induced hearing impairment using ELI(Early Loss Index) was about 92 percent(D-E scale).