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박승영,조대현,문현주,조수열,이준구,이화미,송지영,조옥선 한국식품위생안전성학회 2011 한국식품위생안전성학회지 Vol.26 No.4
This study was performed to investigate contamination levels of aflatoxins, the secondary metabolites produced by fungi Aspergillus flavus and A. parasiticus, in herbal medicine. Herbs is susceptible to these fungi infections through its growth harvest, transport and storage. This study determine the aflatoxin B₁, B₂, G₁ and G₂levels by HPLC-florescence detector coupled with photochemical enhancement in 558 samples herbal medicine distributed in Korea and China. Also, We checked a transfer ratio of aflatoxins from raw herbal medicines to herbal medicine extract. Hot water extraction of herbal medicines was prepared by air pressure and high pressure condition. The analytical method for aflatoxins was validated in this method. In results recoveries of the analytical method were ranged from 67.4% to 96.2% and, limits of detection and quantitation for aflatoxins were 0.015~0.138 μg/kg and 0.046~0.418 μg/kg, respectively. According to the results of monitoring on aflatoxins in herbal medicine, aflatoxins 1.7 ug/kg B1 and 0.9 ug/kg G₁were detected in only one sample of Strychni Ignatii Semen, and 0.8 ug/kg G₁ in Strychni Semen. About 13.6~51.3% of aflatoxins were transferred to hot water extract. Although the detected levels are under the permitted levels for aflatoxins in herbal medicine, these amounts should be considered in regard to overall daily exposure to mycotoxins.
여행사 서비스 품질경영이 기업성과에 미치는 영향에 관한 이론적 고찰
박승영 관광품질시스템학회 2001 관광품질시스템연구 Vol.7 No.1-2
Tourism industry is plying an increasingly important role in the overall economy of the world. There is no doubt about service quality is the most critical edge for the success of travel industry. But travel agents have faced difficult times in recent years because of increasing customer demands and internal competition in the industry. Accordingly, this study was intended to report on an theoretical investigation into the relationship between service quality management in travel agency and its business performance
박승영 관광품질시스템학회 2000 관광품질시스템연구 Vol.6 No.1
The tourism industries assume an increasing importance in the economy. While the tourism industries continue to extend, the research on improving quality in those industries has been limited. In addition to, tourism service quality is an elusive and abstract construct that is difficult to define and measure. Tourist satisfaction with package tour has been seriously under-researches to date. Despite the importance of tourist satisfaction in tourism marketing, seriously lacking are studies identifying consumer-oriented satis-faction factors and applying there factors in actual company marketing. The main purpose of this study is to find the factors which manage tourism service quality and to test the significance of the relationships between tourism service quality, tourist satisfaction.
시변 다중경로 레일리이 페이딩 채널에서의 파일럿 심볼을 이용한 OFDM 시스템의 성능 분석
박승영,강충구 에스케이텔레콤 (주) 2000 Telecommunications Review Vol.10 No.3
본 논문에서는 시변 다중경로 레일리이 페이딩(Rayleigh Fading) 채널에서 발생하는 부반송파간 간섭(ICI : Inter-Carrier Interference)을 고려하여 OFDM(Orthogonal Frequency Division Multiplexing) 시스템의 파일럿 심벌 배치에 대한 정확한 이론적 해석을 위한 모델을 제시하고, 나아가 최적의 파일럿 심벌 배치에 따른 성능분석을 수행하였다. 이를 바탕으로 채널 환경마다 채널 추정에 필요한 최적의 파일럿 심벌 배치가 존재함을 모의실험을 통해 검증하였다. 본 논문에서의 시간 및 주파수 영역을 동시에 고려한 채널 추정 방식의 경우 차동 부호화 방식에 비해 비트오류확률이 10-2 일 때 Eb/N0가 약 3.3dB 정도 향상됨을 확인하였다. 실제 시스템에서는fading rate이나 지연확산이 시변하므로 필터 계수를 최적화시킬 수는 없지만, 필터 계수가 최대 허용 가능한fading rate와 지연확산에 맞게 최적화되어 있으면 그보다 작은 fading rate이나 지연확산에 대해 일정한 성능을유지할 수 있음을 확인하였다.