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열처리 및 보상이온의 주입에 의한 α-수정내의 S₁,S₁',S₁˝ 공명중심들의 변화
송광섭,최재현,최 덕,최옥천,이재훈 명지대학교 자연과학연구소 1995 자연과학논문집 Vol.12 No.-
수정시편을 300℃, 400℃,500℃,530℃에서 각각 20시간씩 열처리한 후에 X밴드 전자 공명장치를 사용하여 α-수정내의 S?(1).S?',S?'' 세 공명중심들에 대한 열처리 조건에 따른 공명 신호들의 세기의 변화를 상온에서 조사하였다.열처리 효과로 S?'과 S?'' 공명중심들이 일부 S?(1)으로 전환되었다. 480℃에서 수정시편의 c축 방향으로 15ooV/cm의 전기장을 가하여 시편내에서 +1가의 보상이온들을 빼내거나, 500V/cm 와 1000V/cm의 전기장으로 Li+ 이온과 Na+이온을 각각 주입시킨 후에 공명신호들의 세기를 서로 비교하였다.한편 시편내에서 보상이온들을 빼내지 않고 400℃에서 20V/cm 와 50 V/cm의 약한 전기장으로La+이온을 주입시킨 경우와 200V/cm의 전기장으로 Na+이온을 주입시킨후에 공명신호들의 세기가 변화하는 모습을 조사하였다.Li+ 이온이 시편에 주입됨에 따라 세 공명중심들 모두 공명신호들의 세기가 증가하였으며, Na+이온이 주입된 경우에는 공명신호를의 세기가 크게 감소하였다. 열처리 효과와 전기장 처리의 결과로부터 세 공명중심들 모두 Li+이온에 의하여 전하가 보상되는 것으로 판명되었다. After heating a quartz sample for 20 hours at 300℃, 400℃, 500℃, and 530℃, respectively, the changes of resonances signal intensities of the centers S?(1), S?', and S?''in α-quartz according to the conditions of heat treatments were investigated at room temperature by employing an X-band electron spin resonance spectrometer. The centers S?' and S1'' were partly converted into S?(1) by the effect of heat treatments. After extracting positively monovalent ions from quartz samples by applying an electric field of 1500V/cm along the crystal c-axis at 480℃ and after electrodiffusing Li+ ions and Na+ ions into the samples with applied electric fields of 500 and 1000 V/cm, respectively, the intensities of resonance spectra were compared with each other. On the other hand a quartz sample was electrodiffused with Li+ ions at 400℃ with weak electric fields of 20 and 50V/cm and then implanted with Na+ions with an electric field of 200V/cm.As Li+ ions diffused into the sample, the intensities of all the three centers increased. But in the case of electrodiffusion with Na+ ions the resonance signals decreased by considerable. From the effect of heat treatment and the result of electrodiffusions it is proved that all the three centers are compensated by the Li+ion.
투자결정요인과 기업특성요인이 한국기업의 對중국 투자전략 수립에 미치는 영향에 관한 연구
송재훈 대한경영학회 2003 大韓經營學會誌 Vol.16 No.6
This article, using the J.H.Dunning's Eclectic Theory(OLⅠ model), identifies the decision-making factors and firm's characteristic factors that explain Korean firms' FDI activities in China from 1988 to 2002. Section" Ⅰ" offers data on Korean firms' FDI activities in China for each year between to 1988 and 2002 and in aggregate for that period: the number of FDI, their dollar value, preferred geographical location, targeted industries, and degree of equity of ownership. Section" Ⅱ", using the J.H.Dunning's model, identifies the characteristics of Korean firms investing in China, their motivation for doing so, and the decision-making factors and firm's characteristic factors guiding their FDI decisions. The primary motivations for FDI by Korean firms in China are the availability of lower labor cost and the attraction of a rapidly growing market. This research also found that the FDI pattern is increasingly changing from investment in labor-intencive, low technology industry to high technology, capital-intencive industries. As per this study, decision-making factors of importance are ownership-specific and location-specific advantages. Internalization-incentive advantages are not applicable to Korean firms' investment decisions.
두개강내로 전이된 Adenoid Cystic Carcinoma 2례 : 증례보고 Report of Two Cases
송재욱,윤상민,이창훈,장지수,이승훈,조경자,강신광 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.10
The authors describe two cases of unusual intracranial metastatic adenoid cystic carcinomas. A 42-year-old woman had a right pariental epidural metastatic mass. presumed hematogenous. spread from a primary tumor in the parotid gland. In second case, a 32-year-old man had a intracranial metastatic adenoid cystic carcinoma mimicking calcified psammomatous meningioma on CT scans. We present these unusual cases with a review of relevant literature and a discussion of possible pathogenesis.
송재훈,정기석,강문원,김도진,배현주,서지영,심태선,안중현,안철민,우준희,이남용,이동건,이미숙,이상무,이영선,이혁민,정두련,지역사회획득 폐렴 치료지침 제정위원회 대한감염학회 2009 감염과 화학요법 Vol.41 No.3
A successful therapy of community-acquired pneumonia requires appropriate empirical antimicrobial therapy. Etiology and antimicrobial susceptibility of major pathogens of pneumonia can differ by country. Therefore, an ideal treatment guideline of community-acquired pneumonia should be based on the studies performed in each country. We developed a treatment guideline for community-acquired pneumonia in immunocompetent adults in Korea. This guideline was developed by the joint committee of the Korean Society for Chemotherapy, the Korean Society of Infectious Diseases, and the Korean Academy of Tuberculosis and Respiratory diseases.
과립구 감소 환자의 감염시 Imipenem/cilastatin 단독요법의 치료효과 : Piperacillin-amikin 병합요법과의 무작위 비교
송재훈,최승원,박수길,고윤석,서철원,이규형,이정신,문희법,김상희 대한화학요법학회 1991 대한화학요법학회지 Vol.9 No.2
To evaluate the efficacy of the single agent therapy for the initial management of fever in neutropenic patients, we conducted a prospective randomized trial comparing imipenem/cilastatin alone with a combination of piperacillin and amikacin. Among 40 evauable episodes of fever, stratum A(hematologic malignancy, n=30) consisted of 15 imipenem group and 15 piperacillin plus amikacin group and stratum B consisted of 10 cases with solid tumor. There was no difference in age, sex, duration of neutropenia, initial granulocyte count and number of cases with severe neutropenia(<100/㎣) between two groups. Overall response rate to imipenem was higher(86.6%) than combination therapy group(53.5%) in stratum A, but statistical difference was not found. Overall response rate to imipenem in solid tumor was 100% whereas to combination therapy group was 40%. There was no serious toxicity on imipenem use. We conclude that imipenem monotherapy could be an effective & safe empirical therapy in the treatment of febrile neutropenic patients.