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許鎭哲,李聖行 慶北大學校 醫科大學 1979 慶北醫大誌 Vol.20 No.2
正常人 靑年 22名을 對象으로 胸腹壁의 抱束性 運動制限을 가하고 Collins社 製品인 basic clinical spirometer modul 과 residual volume module을 使用하여 폐기능을 測定하고, helium 폐쇄회로법으로 잔기량, 기능적잔기량 및 전폐기량을 測定하고 아울러 helium混合時間을 測定하였다. 그 結果를 要約하면 다음과 같다. 1회환기량은 감소하고 呼吸數는 增加하였으나 分時換氣量은 不變하였다. 폐내 흡입가스 분포는 뚜렷하게 지연되어서 不均等換氣를 나타냈다. 强制呼氣量, 殘氣量, 機能的殘氣量, 全肺氣量 및 殘氣量의 全肺氣量의 比는 有意하게 감소하였으나 그중에서 殘氣量의 감소는 경하였다. 最大自發的換氣量, FEF 25∼75%, FEV 0.5, FEV 1.0은 감소하였으나 FEV 200∼1200ml, FEV 0.5/FVC, FEV 1.0/FVC는 변동하지 않았다. 氣速係數(air velocity index)는 運動制限後 1보다 큰 수치를 나타내었다. 本 實驗에 있어서와 같이 심한 運動制限을 加했을 때 抱束性 換氣障碍와 함께 閉??性 障碍도 경하게 發生한 것으로 解釋된다. This study is for the evaluation of the changes of pulmonary function following chest restriction. In 22 normal males, chest restriction was produced by thoracoabdominal strapping. Pulmonary functions were measured with Collins basic clinical spirometer module and residual module. Helinm closed circuit technique was used to measure residual volume(RV) and helium mixing time. Respiratory rate decreased while tidal volume increased, so that minute volume remained unchanged. Helium mixing time increased significantly and uneven ventilation seemed to be apparent. Forced expiratory volume, residual volume, functional residual capacity, and RV/TLC markedly decreased, however magnitude of decrease of residual volume was minimal. Maximal voluntary ventilation, FEF 25∼75%, FEV 0.5 and FEV 1.0 decreased, though FEV 200∼1,200ml, FEV 0.5/FVC and FEV 1.0/FVC showed no significant change. Above mentioned data are characteristically related to the alteration of pulmonary function of restrictional type of thorax, however some change ascribed to the obstructive lesion also found.
지속적인 심장질환 모니터링을 위한 인체 삽입형 생체 센서의 무선전력전송 시스템
허진철,이종하 한국융합신호처리학회 2019 융합신호처리학회 논문지 (JISPS) Vol.20 No.2
We investigated the variations in the magnetic-field distribution and power transmission efficiency, resulting from changes in the relative positions of the transmitting and receiving coils, for electromagnetic-induction–type wireless power transmission using an elliptical receive coil. Results of simulations using a high-frequency structure simulator were compared to actual measurement results. The simulations showed that the transmission efficiency could be maintained relatively stable even if the alignment between the transmitting and receiving coils was changed to some extent. When the centre of the receiving coil was perfectly aligned with the centre of the transmitting coil, the transmission efficiency was the maximum; however, the degree of decrease in the transmission efficiency was small even if the centre of the receiving coil moved by ± 10mm from the centre of the transmitting coil. Therefore, it is expected that the performance of the wireless power transmission system will not be degraded significantly even if perfect alignment is not maintained. The results suggested a standardized application method of wireless transmission in the utilization of wireless power for implantable sensors 전자기 유도형 무선전력전송에서는 송신 코일과 수신 코일의 상대적 위치에 따른 자기장 분포와 동력 전달 효율이 매우 중요하다. 본 연구는 ECG 센서를 사용한 HFSS 시뮬레이션 결과를 실제 측정 결과와 비교하였다. 시뮬레이션 결과 송신 코일과 수신 코일 간의 정렬이 어느 정도 변경 되더라도 전송효율은 비교적 안정적으로 유지 될 수 있음이 나타났다. 수신 코일의 중심 이 송신 코일의 중심과 완벽하게 일치하면 전송효율이 최대가 되며, 수신 코일의 중심이 송신 코일의 중심으로부터 ± 10㎜ 내 의 이동은 전송효율의 감소가 크지 않음을 확인 하였으며, 무선 전력 전송 시스템의 성능이 크게 저하되지 않는 것으로 확인 되 었다. 본 결과는 이식형 센서를 위한 무선 전력의 활용에서 무선 전송의 표준화 된 적용 방법을 제안한다. 이를 통해 이식형 임 플란트의 개발에 있어 무선전력전송에 대한 기준을 제시하고, 관련 디바이스의 개발에 적용 할 수 있을 것으로 판단된다
許鎭哲,朴舜奉,崔大永,朴廷烈,朴雨春,李成久 경북대학교 의학연구소 1969 慶北醫大誌 Vol.10 No.2
Two cases of PDA associated with SBE were experienced and surgically corrected with satisfactory results. For a intractably febrile case during the course of chemotherapy of 104 days, the ductus was doubly ligated. The other was treated by division and suture technique after 34 days chemotherapy. Clinical symptoms, signs and hospital courses were presented. Antibiotic treament before and after surgery was distcussed in detail.
쇠뒤쥐 (Sorex minutus gracillimus)의 정자변태
허진철,이정훈,Heo, Jin-Chol,Lee, Jung-Hun 한국현미경학회 2001 Applied microscopy Vol.31 No.2
식충목 땃쥐과 쇠뒤쥐 (Sarex minutus gracillimus)의 정자변태과정을 알아보기 위하여 세정관 상피의 세포분화에 따른 형태적 특징을 조사하여 다음과 같은 결과를 얻었다. 쇠뒤쥐의 정자변태과정을 골지기, 두모기를 각각 전 중 후기로, 첨체기를 각각 전 후기로, 성숙기와 이탈기를 각각 하나의 단계로 총 10단계로 나눌 수 있었다. 핵질의 응축은 첨체기에 시작하여 이탈기에 완성되었으며, 만세트의 출현은 첨체후기부터 성숙기까지 나타났다. 정자편모의 형성은 골지후기에 생성하여 이탈기에 완성되었다. 다포체는 골지기부터 성숙기까지 나타났으며, 골지기는 주로 pale multivesicular body가, 두모기와 첨체기는 주로 pale 또는 moderate pale multivesicular bodies가 그리고 성숙기에서는 dense multivesicular body가 관찰되었다. To investigate the spermiogenesis of the Saghalien Pygmy shrew (Sorex minutus gracillimus), the testis obtained from mature male shrew was studied by electron microscopy, and the following results obtained based on the morphological characteristics of cell differentiation of the seminiferous epithelium in the testis. According to the fine structural differentiation, spermiogenesis of S. minutus gracillimks was divided into Golgi, cap, acrosome, maturation and spermiation phases. Beside, the Golgi and cap phases were subdivided into three steps of early, middle and late phase respectively, and acrosome phase into two steps of early and late phase , and maturation and spermiation phases has only one step respectively. Thus, the spermiogenesis of S. minutus gracillimus was divided into a total of ten steps. The chromatin granules begin to be condensed in the acrosome phase, and a perfect nucleus of sperm was formed at the spermiation phase. Mancette were appeared from the late acrosome phase to the maturation phase. The formation of sperm tail began to develop in the late Golgi phase, and completed at the spermiation phase. Multivesicular bodies were appeared from the Golgi phase to the maturation phase, recognized with pale, pale and moderate, and dense at Golgi, cap and acrosomal and matulation phases respectively.
허진철,황재삼,강석우,윤치영,이상한 慶北大學校農業科學技術硏究所 2007 慶北大農學誌 Vol.25 No.-
In order to investigate the availability of insect resources for agrobiotechnological or medical purposes, we examined antioxidant (DPPH and FRAP assay) and cell viability by oxidant stress and NO inhibition assay by treatment of the extracts of Statilia maculata Thunberg, Tenodera angustipennis Saussure and Tenodera aridifolia Stoll. We found that Tenodera angustipennis Saussure and Tenodera aridifolia Stoll extract (DW, etanol, methanol) had high levels of anti-oxidant activity, whereas Tenodera aridifolia Stoll extract showed increased cell viability by hydrogen peroxide and inhibition of NO production. These findings suggest that Statilia maculata Thunberg, Tenodera angustipennis Saussure and Tenodera aridifolia Stoll, extract have potentials to be developed for agrobiotechnology or medicinal use, indicating that mechanistic study including inhibition against molecular inflammation will show a possibility for the development of useful insect resources.