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조혁 충남대학교 1990 忠南科學硏究誌 Vol.17 No.1
Electron-impact spectrum taken at a fixed scattering angle of 90˚ and an incident electron energy of 45eV is reported for helium. Electron-energy loss peaks corresponding to the transitions to 2^1P and 3^1P states are observed. But, the optically-forbidden transitions to 2^1S and 2^3S states are not clearly identified.
조혁,김성현,김기환,김동수 대한소아감염학회 2008 Pediatric Infection and Vaccine Vol.15 No.2
Purpose : The purpose of this study is to investigate the clinical characteristics of recurrent Kawasaki disease (KD). Methods : From January 2004 to December 2007, the medical records of 20 children with recurrent KD in Severance Children's Hospital were retrospectively reviewed. The clinical characteristics, laboratory findings, treatment and complications of these patients were compared between the initial episode and the second episode. Results : At the initial episode of the recurrent KD group, the gender ratio was 1.2:1 (male:female) and the mean age was 37.2±19.9 months. The interval between the two episodes in the recurrent KD group was 3.3 months. The febrile period before admission was shorter for the second episode (P=0.034). The skin rash was less developed in the second episode. But there were no differences in the laboratory results and complications between the initial episode and the second episode. Three patients (15%) among those with a second episode failed to respond to the initial intravenous immunoglubulin treatment. On comparison between the initial episodes of the recurrent group and the nonrecurrent group, the erythrocyte sedimentation rate was higher in the first episode of the recurrent KD group. Conclusions : For recurrent KD, it tends to present more atypical features than the KD that occurs for the first time. Physicians should consider these characteristics when making the diagnosis and treating recurrent KD. (Korean J Pediatr Infect Dis 2008;15:188-194) Purpose : The purpose of this study is to investigate the clinical characteristics of recurrent Kawasaki disease (KD). Methods : From January 2004 to December 2007, the medical records of 20 children with recurrent KD in Severance Children's Hospital were retrospectively reviewed. The clinical characteristics, laboratory findings, treatment and complications of these patients were compared between the initial episode and the second episode. Results : At the initial episode of the recurrent KD group, the gender ratio was 1.2:1 (male:female) and the mean age was 37.2±19.9 months. The interval between the two episodes in the recurrent KD group was 3.3 months. The febrile period before admission was shorter for the second episode (P=0.034). The skin rash was less developed in the second episode. But there were no differences in the laboratory results and complications between the initial episode and the second episode. Three patients (15%) among those with a second episode failed to respond to the initial intravenous immunoglubulin treatment. On comparison between the initial episodes of the recurrent group and the nonrecurrent group, the erythrocyte sedimentation rate was higher in the first episode of the recurrent KD group. Conclusions : For recurrent KD, it tends to present more atypical features than the KD that occurs for the first time. Physicians should consider these characteristics when making the diagnosis and treating recurrent KD. (Korean J Pediatr Infect Dis 2008;15:188-194)
전자 충돌에 의해 헬륨으로부터 생성되는 저에너지 이차전자의 에너지 분포
조혁,김승섭,전재식,오영기 충남대학교 기초과학연구소 1991 연구논문집 Vol.11 No.-
50 eV에너지를 가진 입사전자가 헬륨원자와 충돌하여 생성되는 이차전자를 잡힌 전자법으로 검출하여, 1 eV이하의 에너지를 가진 이차전자의 생성 적분 단면적을 측정하고, 0eV 근처에서의 단일미분 단면적을 결정하였다. 그 결과 E_s=0 eV에서 단일미분 단면적 3.0±10^-18㎠/eV를 얻었다.
Low-energy Electron Scattering with CH_3C: Comparison with the High-energy Counterpart
조혁 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.1
Motivated by the previous observation [Kato et al., J. Chem. Phys. 132, 074309 (2010)] that the structure seen in the elastic electron scattering cross sections from CH_3X (X = F, Cl, Br, and I) molecules at intermediate energies (50 - 200 eV) is also found, at least in part, in the corresponding noble gas species, we measured differential cross sections for the elastic scattering of electrons from CH_3Cl at the low incident electron energies of 5, 10, and 20 eV for scattering angles from 20˚ up to 180˚. We confirmed that, as we went to lower electron energies, the “atomic-like” behavior faded out, and the “molecular-like” behavior became increasingly prominent.
전자충돌에 의해 N_2, O_2 및 H_2O로부터 생성되는 저에너지 이차전자의 에너지 분포
조혁,이상훈,김승섭,전재식 충남대학교 기초과학연구소 1992 연구논문집 Vol.12 No.-
100eV의 에너지를 가진 입사전자가 N_2, O_2 및 H_2O와 충돌하여 생성되는 이차전자를 "잡힌 전자법"으로 검출하여 N_2와 O_2의 경우, 1eV에서 5eV 사이의 에너지를 가진 이차전자의 생성미분단면적을 측정하였고, H_2O의 경우, 0.2eV에서 2eV 사이의 생성미분단면적을 측정하였으며, 이 결과들을 다른 측정결과들과 비교하였다. Single differential cross sections of secondary electrons ejected from N_2, O_2, and H_2O by 100 eV electron impact have been measured using a trapped-electron method. The measurements were made for the secondary-electron energies between 1 and 5 eV for N_2 and O_2, and between 0.2 and 2 eV for H_2O. The results are compared with others.
Multifocal Osteosarcoma of the Skull: Multiple Primary or Metastatic? A Case Report
조혁,박용구,박봉진 대한병리학회 2014 Journal of Pathology and Translational Medicine Vol.48 No.2
Osteosarcoma of the skull is a very rare condition. Moreover, it is extremely rare for osteosarcoma to present as multiple lesions confined to the skull. A 58-year-old woman was admitted with two masses in the parietal area of the skull, accompanied by mild headache and tenderness. Imaging revealed two masses with a heterogeneous consistency in the cranial bones. Excision craniectomy was performed and the pathology was consistent with osteoblastic osteosarcoma. Two nodules in the heart were found on routine follow-up imaging while the patient was undergoing chemotherapy.