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정경재,전재복 대한의진균학회 1996 대한의진균학회지 Vol.1 No.1
Background: Dermatophytosis is usually caused by a contact of the skin with the infective particles in the environment. Objective: To investigate the extent and severity of environmental contamination by dermatophytes. Method: In addition to physical examination on the residents of 46 families in a rural town in Kyungpook Province, clinical material and house dust samples were cultivated for dermatophytes. Results: Among 114 persons from the 46 families, dermatophytosis was detected in 33 persons(28.9%), The most frequent clinical type was tinea pedis. Trichophyton rubrum and T. mentagrophytes were etiologic agents. In 22 families (47.8%), T. rubrum (16 families, 34.8%) and T. mentagrophytes (6 families, 13.0%) were isolated from the skin lesions. The remaining 24 families (52.2%) we.e free from dermatophytosis. T. rubrum was detected in the house dust samples from 40(86.9%) of the 46 families, with a density of 34.0 colonies/g, the highest among isolates.; T. mentagrophytes, from 32(69.6%); Microsporum canis, from 1(0.2%); 3(6.5%) were without any dermatophytes. T. rubrum was isolated from the house dust of 15(93.7%) out of 16 families having tinea patients infected with the same fungus, and T. mentagrophytes in 5(83.3%) out of 6. Each case was frequently detected together with other dermatophytes. T. mentagrophytes subtypes were isolated from house dust singly in 19(41.3%), and in twos and threes in 13(28.3%) of the 46 families. Even in the families of the patient(s) with the fungus the subtypes were not always identical with those from house dust. In a mating study with a total of 210 strains of T. mentagrophytes, 130 out of 136 (including 6 indeterminate) strains of granulosum-asteroides form turned out to be Arthroderma vanbreuseghemii"-". But all the 70 strains of the powdery, persicolor and downy forms that showed strong sexual stimulation by tester strains, were "+". Conclusion: House dust was extensively and markedly contaminated by dermatophytes in a rural town. Further study is needed to evaluate the distribution of mating types of the members of T. mentagrophytes complex in a clinical setting.
요추 추간판 질환에서 자기공명 척수조영술과 고식적 척수조영술의 비교
정경재 대한영상의학회 1996 대한영상의학회지 Vol.34 No.2
Purpose : To compare MR myelography(MRM) using heavily T2 weighted fast spin echo(FSE) with conventionalmyelography in the evaluation of lumbar degenerative disc diseases. Materials and Methods : A total of 50 patientswith lumbar degenerative disc diseases underwent both MRM and conventional myelography. A 1.5 T Signa MR systemwas used. For MRM, heavily T2 weighted FSE pulse sequences were performed in sagittal, coronal and both obliqueplanes. The images of MRM and conventional myelography were analyzed retrospectively and compared, focusing on thepattern of compression of the thecal sac and nerve roots. Results : MRM yielded comparable images to conventionalmyelography in68% (34/50). MRM was superior to conventional myelography in 11 cases (22%), and the oppositeresulted in 5 cases(10%). MRM could visualize the spinal canal below the level of complete block in 6 patients,provided better contrast in the cases of dural ectasia in 3 cases and better delineation of individual nerve rootswith source images in 1 case. Additional informations such as incidental retroperitoneal vascular malformation andextravasation of the CSF could be obtained by MRM in 1 case each. Disadvantages of MRM were poor contrast in thecases of multiple spinal stenosis, obscuration of the nerve roots by engorged paraspinal vessels, and occassionaldifficulty in defining the levels due to vanishment of the bony background image. Conclusion : MRM is a safe,noninvasive, nonionizing modality which in very effective in evaluating the lumbosacral disc disease. Use ofFSE-MRM in addition to the routine MR imaging could be very helpful not only for better evaluation of nerve rootsbut also for the additional informations.
정경재 대한영상의학회 1995 대한영상의학회지 Vol.33 No.3
원장미부 낭종은 직장후부에서 생기는 드문 선천성 기형이며 악성종양의 발생은 매 우 드물게 보고되어 있다. 저자들은 원장미부 낭종에서 병발한 선암 1예를 경험하였다. 단순 촬영상 천골의 골파괴소견을 보이면서 초음파상 낭종성의 종괴로, 전산화단층촬영상 조영증 강이 되는, 석회화를 동반한 저음영의 종괴로 보였으며, 자기공명영사엥서는 고형성분을 가 진 다방성 낭종성 종괴로 관찰되었다. Tailgut cyst is a rare congenital anomaly arising in the retrorectal space. Malignancy arising from thetailgut cyst is very rare. We experienced a case of adenocarcinoma arising from the tailgut cyst. The findings ofthis rare tumor are bony destruction of the sacrum on plain radiograph, a cystic mass on ultrasound, a lowattenuation mass with calcification and enhancement on CT, and a multiseptated cystic mass containing solidcomponent on MRI.
Dynamics of plasma channel in a parallel-plate plasma gun
정경재,K.S. Chung,황용석 한국물리학회 2014 Current Applied Physics Vol.14 No.3
Lumped parameter models for describing dynamics of the plasma channel in a parallel-plate plasma gun are compared with the experimental results obtained from two plasma guns with different rail geometries. Comparison between the experiments and the numerical calculations reveals that the lumped parameter models can be utilized to describe the dynamic motion of the plasma channel quite well. Parametric study shows that minimizing the line inductance and increasing the charging voltage on a capacitor as well as minimizing the gas injection time for reducing the mass of the plasma channel are the key factors to increase the flow velocity of the plasma jet ejected from the plasma gun.
PSII 펄스 시스템의 동적 플라즈마 부하 회로 모델 개발
정경재,최재명,황휘동,김곤호,고광철,황용석,Chung, K.J.,Choe, J.M.,Hwang, H.D.,Kim, G.H.,Ko, K.C.,Hwang, Y.S. 한국진공학회 2006 Applied Science and Convergence Technology Vol.15 No.3
음의 고전압의 인가에 따라 반응하는 동적 플라즈마를 부하로 갖는 PSII(plasma source ion implantation) 펄스 시스템을 분석하기 위한 회로 모델을 개발하였다. 플라즈마 내에 삽입된 평판 전극 앞에서의 플라즈마 쉬스의 움직임은 동적 차일드-랑뮤어 쉬스 모델을 따르는 것으로 가정하였다. 표적 전극에 흐르는 전류는 전극에 인가되는 전압과 서로 영향을 주며 변하므로 동적 플라즈마 부하를 전압 의존 전류 원으로 표현하여 자기모순이 없는 회로 모델을 구현하였다. 회로 해석은 Pspice 프로그램을 이용하여 수행하였으며, 다양한 플라즈마 조건과 펄스인가 조건에서의 실험 결과와 비교하여 회로 모델의 타당성을 검증하였다. A circuit model has been developed to analyze characteristics of the PSII(plasma source ion implantation) pulse system with dynamic plasma load. The plasma sheath in front of the immersed planar target biased with a negative-high voltage pulse is assumed to be governed by the dynamic Child-Langmuir sheath model. Target current is self-consistently varied with the applied voltage by using the voltage-controlled current source in the circuit model. Circuit simulations are conducted with Pspice circuit simulator, and simulated pulse currents and voltages on the target are compared and confirmed with experimental results for various voltage pulses and plasma conditions.