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AP 비콘신호를 이용한 피코셀 환경에서의 전파측정 및 분석시스템
노정규,김영기,이진수,차재상 통신위성ㆍ우주산업연구회 2014 한국위성정보통신학회논문지 Vol.9 No.3
본 논문은 ISM 대역의 WiFi의 주파수를 이용하여 피코셀 환경에서의 비콘신호 세기를 측정 및 분석에 관한 논문이다. 사용 AP의비콘신호를 스마트폰의 비콘신호 측정 어플을 이용하여 측정하고 이를 PC의 어플리케이션을 이용하여 구글맵에 AP 신호세기를표시한 것이다. 스마트폰의 측정 데이터는 비콘신호의 RSSI와 GPS신호를 맵핑시켜 측정하고 이 측정한 자료는 PC의 구글맵 위치좌표로 변환하여 Tracking 자료를 분석할 수 있는 시스템이다. 이 측정 및 분석 시스템을 이용하여 AP가 위치한 지역마다 전파신호변화를 분석 파악할 수 있다 In this paper, we measure and analyze strength of Beacon signal in Picocell environment by using the frequency of WiFiof ISM band. It is displaying the value what measured by using a beacon signal measurement smartphone app in using AParea, on Google maps using the PC application. the data measured by using mapped GPS signal and RSSI of beacon signal,and convert this data to Position coordinates for Google map in PC. when use this system, we can understand and analyzechanges of radio signal through location where installed AP
Oxytetracycline과 Erythromycin Stearate의 생체유용성 검토
임정규,정명희,신상구,차인준,Lim J.K.,Chung M.H.,Shin S.G.,Cha I.J. 대한약리학회 1977 대한약리학잡지 Vol.13 No.1
The physicochemical equivalencies of drugs are not usually correlate to the generic equivalencies of drugs and the generic equivalencies of drugs produced by different manufacturers or different formulations are being called in question frequently. The bioabailability of two formulations of oxytetracycline and erythromycin stearate were performed in healthy human volunteers. At the same time, the disintegration testes were performed with randomly sampled materials in question. For the biological evaluation of new oxytetracycline formulation; tablet(250mg), two-way cross over study in 10 healthy young volunteers was performed using oxytetracycline capsule (250mg) as reference, Erythromycin stearate (250mg) tablets and capsules produced by different manufacturers were compared in a two-way cross over study in 12 subjects with same manner of oxytetracyclines. oxytetracycline tablets showed somewhat slow disintegration rate, but appeared not statistical differences in serum concentrations from the reference, up to six hours after ingestion. Erythromycin stearate capsules disintegrated more rapidly than enteric coated tablets. Serum concentrations of capsules were more variable and markedly lower (P<.005 after 2hrs) than the enteric coated tablets. Rapid disintegration of capsules may result in destruction of active chemicals owing to the interaction with gastric acid and the above factor may contribute mainly to the low serum level after ingestion of capsules.