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공동주택 내 비상방송설비의 음성명료도 실태 분석 및재실자 인지성 개선방안 연구
오소영,조현민,이영주,이민주,윤명오 한국화재소방학회 2018 한국화재소방학회논문지 Vol.32 No.4
공동주택의 복잡한 평면 구조와 향상된 벽간 차음성능으로 인해 화재상황의 전달 및 인지가 어려워 피해가 증가되고 있는 실정이다. 본 연구에서는 국내 공동주택 평면 형태를 대상으로 소방시설 중 비상방송설비의 명료성에 대한 실태분석을 진행하였다. 아울러 피난방송의 명확한 인지를 위한 음성명료도 개선 방안을 시뮬레이션을 통해 분석하였다. 현장측정 결과 72, 84, 101 Type 모두 국내 경보설비기준인 90 dBA를 R1 지점에서 만족하지 못하는 것으로나타났다. 또한 72 Type의 L1 지점(거실) 79.8 dBA를 제외하고는 모든 측정지점에서 출입문을 열었을 때와 닫았을때 모두 NFPA 기준 75 dBA를 만족하지 못하는 것으로 평가되었다. 침실의 출입문 개구 상태를 기준으로 국내 화재안전기준에서 제시된 1 m 이격지점에서 90 dBA 이상을 만족시 각 침실에서 NFPA 기준인 음압레벨 75 dBA와 CIS0.7을 만족하였다. Due to the complicated plan structure of the apartment units and the improved room-to-room sound insulationperformance, it is difficult to communicate and recognize the fire situation by emergency broadcast equipment. In this study,speech intelligibility was measured and analyzed for three types of apartment unit by emergency broadcast equipment onvarious measurement points. Simulations were also conducted to improve the speech intelligibility. As a result of fieldmeasurements 72, 84, and 101 Type were not satisfied with NFSC standard of 90 dBA at the point of 1 m distance fromsource. In addition, it was evaluated that 75 dBA and CIS 0.7 of NFPA standard was not satisfied at all measurement pointsexcept for the 72 Type at living room point with door opened condition. Based on the door opened condition of thebedroom, it satisfied the NFPA of 75 dBA and CIS 0.7 in each bedroom when more than 90 dBA was satisfied at the1 m separation point provided in NFSC standard.
Helicobacter pylori 감염과 위선암의 발생 사이의 연관성에 관한 최근 연구 : a Review of the Literature
오소영,신애선,황승식,유근영 한국역학회 2002 Epidemiology and Health Vol.24 No.2
Purpose : Stomach cancer is a major cancer in the world as well as in Korea. Helicobacter pylori infection was suggested causing atropic gastritis, but there has been a debate on the association with the gastric adenocarcinoma. We reviewed recent literatures and meta-analyses on the association between Helicobacter pylori infection and the development of gastric adenocarcinoma. Results : The animal experiments suggested that Helicobacter pylori is a causative agent of gastric adenocarcinoma. Meta-analyses on the relationship between Helicobacter pylori infection and gastric adenocarcinoma showed increased risk in infected person, but the strength of association was varied with study design, characteristic of study participants and the nature of tumors. Conclusions : Recent study results suggested that Helicobacter pylori is a necessary causative agent for development of gastric adenocarcinoma. Assessment of the association between Helicobacter pylori infection and other related with gastric cancer risks and the effects of the eradication therapy of Helicobacter pylori infection on the prevention of gastvic cancer need further evaluation.
재배농법에 따른 국내산 배추의 위해미생물 및 중금속 오염평가
오소영,남기웅,윤덕훈 한국식품위생안전성학회 2017 한국식품위생안전성학회지 Vol.32 No.6
Kimchi cabbage is one of the four major vegetable crops in Korea. The total annual production of kimchi cabbage, the main material of kimchi, was 20,559 tons in 2015. Kimchi cabbage is one of the majer crops produced by farmers which accounts for about 80% of the total leaf vegetable production in Korea. As the consumption of environmental-friendly agricultural products increases, food safety is one of the major public health concerns. We analyzed the biological hazards of kimchi cabbage produced by two types of cultivation methos such as organic farming and conventional farming using various culture media and microscopy. A total of 432 samples were analysed for presence of sanitary indicator microorganisms (aerobic plate count, coliform count, yeast & mold) and food-borne pathogens (Staphylococcus aureus, environmental Listeria, Bacillus cereus). The population of sanitary indicating microorganisms and food borne pathogens was under 5 Log CFU/g in all tested samples. The results of total microorganism numbers of leaf surface showed a positive correlation to those of soil samples. Additionally, we examined chemical factors such as pesticide residues and heavy metals in soil samples. All tested samples did not shown contamination levels higher than the standard limit.
오소영,남기웅,윤덕훈 한국식품위생안전성학회 2018 한국식품위생안전성학회지 Vol.33 No.1
This study was conducted to evaluate the microbiological safety of leafy vegetables (perilla leaf and lettuce) in relation to cultivation methods. A total of 2,304 samples were collected from plants, harvesting tools and soil mulching film during the production and harvest stages from organic- and conventional- farms. From the samples, sanitary indicator microorganisms (total aerobic bacteria, coliforms, E. coli., Environmental Listeria, and yeast and mold) and pathogenic microorganisms (S. aureus, B. cereus, Salmonella spp., Clostridium spp., and L. monocytogenes) were analyzed. In the production stage of leafy vegetables, the sanitary indicator microorganisms was not detected regardless of cultivation method or it was detected to be less than 3.4 Log CFU/100 cm2. B. cereus and S. aureus were found to be 0.22~1.55 Log CFU/g in perilla leaf and lettuce produced by organic farms, and S. aureus was not detected and B. cereus was found to be 0.42~2.19 Log CFU/g in conventional farms. There were no significant differences between two cultivation methods. In the harvesting tools and soil mulching film, the contamination levels of sanitary indicator microorganisms and pathogenic microorganisms was low regardless of the cultivation method. However, there was a positive correlation (R2 = 0.4526) in that the higher the microbial contamination level in the harvesting tool, the higher the microbial contamination on the surface of the plant. In addition, sanitary indicator microorganisms and pathogenic microorganisms were not detected or low in soil mulching during the production of organic leafy vegetables. As a result of this study, microbial hygiene control by soil mulching and harvesting tools was more important than difference of cultivation method in production of leafy vegetables.
오소영 학습자중심교과교육학회 2023 학습자중심교과교육연구 Vol.23 No.19
Objectives This study aimed to present the suggestion about the direction of playfulness to be pursued by Elementary social studies classroom activities by investigating the playful nature inherent in it. Methods For this purpose, this study examined the concept and attributes of play through Play Theory, and ob served and interpreted learners' play patterns in the activities of three elementary school teachers' social studies classes. And indentified the playfulness of social studies activities through classroom observations, interviews with teachers and learners, and analysis of post-classroom reflections. Results From a heortē perspective, play is interpreted as an attribute of activity or intensity of play, and the activ ities of social studies would be seen as having a playful character or as play itself. The factors that make learners playful in an activity are related to the attributes of play, such as ‘spontaneity’, ‘conversation’, ‘authenticity’, and ‘playfulness, and seriousness’, and when an activity has these playful characteristics, learners feel and engage in the activity itself as play. Conclusions In social studies activies, play should be pursued as purpose, not a means. Social studies activities as play can restore learners' subjectivity and foster practical attitudes by placing learning in the context of real life. The social studies classroom plays a role as a playground, making learning a joyful play of participation and communication.