• 한국과학교육학회지
• /
• 제23권5호
• /
• pp.484-493
• /
• 2003

본 사례연구를 통하여 과학수업 관찰과 분석의 실례를 제공하려고 한다. 수업관찰과 수업 전후에 걸친 교사와의 심층 면담을 실시하였으며, 수업에 활용된 교수학습 자료들을 수집하였다. 한 과학 교사의 수업을 (1)교육과정 및 교과내용 측면, (2)교수학습 방법, (3)학습자에 대한 이해, (4)수업 분위기, (5)평가, (6)교사의 전문성 개발을 위한 노력 등의 6가지 범주에 초점을 맞추어 관찰하고 분석하였다. 본 사례연구 교사는 스스로의 수업개선을 위해 노력하고 있을 뿐만 아니라, 그의 실천적 지식을 다른 교사들과 공유하기 위하여 현직교사 연수에도 활발히 참여하고 있었다. 타당한 수업 평가틀(관찰틀)이 교사교육 및 현직 교사들의 전문성 개발에 주는 시사점도 논의되었다. 이러한 수업 평가틀은 교사들에게 고도로 숙달된 수업 실제에 대한 지향점을 제공할 것이다.

• 한국환경과학회지
• /
• 제17권12호
• /
• pp.1315-1324
• /
• 2008

This study was investigated on the consciousness of middle school students in Jeju city about the environmental education through questionnaire, in order to understand the actual conditions of environmental education and to find out the solutions about them. Middle 'school students responded that environmental education in school was taken at the class for the special activity or voluntary service, not in regular class and was worked as in the form of the field trip. They generally obtain the knowledge and informations on the environmental problems from mass media such as TV, radio and newspaper than from regular environment class in school. And 36.0% of students perceive that environmental education is needed as a regular class and 31.3% of students perceive that the regular class in school is effective to the environmental education. These results suggest that many students are interested in the regular environment class in school. However, the most of students responded that the regular environment class in school is not worked or is not worked at all, suggesting that the environmental education in middle school is not worked effectively. Most of students prefer to take the environment class in the form of observation or field trip, and they think that observation or field trip is more effective to obtain environmental informations. In conclusion, the special activity such as observation or field trip needs to be supplemented to regular environment class in order to improve the environmental education in middle school more effectively.

• Agribusiness and Information Management
• /
• 제6권1호
• /
• pp.1-11
• /
• 2014

The purpose of this study is to develop the growth prediction model that can predict growth and development information influencing on the production of citrus fruits. The growth model was developed to predict the floral leaf ratio, number of fruit sets, fruit width, and overweight fruits depending on the main period of growth and development by considering the weather factors because the fruit production is influenced by weather depending on the growth and development period. To predict the outdoor-grown citrus fruit production, the investigation result for the standard farms is used as the basic data; in this study, we also understood that the influence of weather factors on the citrus fruit production based on the data from 2004 to 2013 of the outdoor-grown citrus fruit observation report in which the standard farms were targeted by the Agricultural Research Service and suggested the growth and development information prediction model with the weather information as an independent variable to build the observation model. The growth and development model for outdoor-grown citrus fruits was assumed by using the Ordinary Least Square method (OLS), and the developed growth prediction model can make a prediction in advance with the weather factors prior to the observation investigation for the citrus fruit production. To predict the growth and development information of the production of citrus fruits having a great ripple effect as a representative crop in Jeju agriculture, the prediction result regarding the production applying the weather factors depending on growth and development period could be applied usefully.

• Journal of Animal Science and Technology
• /
• 제65권4호
• /
• pp.759-766
• /
• 2023

Visual estrus observation can only be confirmed at a rate of 50%-60%, which is lower than that obtained using a biosensor. Thus, the use of biosensors provides more opportunities for artificial insemination because it is easier to confirm estrus than by visual observation. This study determines the accuracy of estrus prediction using a ruminoreticular biosensor by analyzing ruminoreticular temperature during the estrus cycle and measuring changes in body activity. One hundred and twenty-five Hanwoo cows (64 with a ruminal biosensor in the test group and 61 without biosensors in the control group) were studied. Ruminoreticular temperatures and body activities were measured every 10 min. The first service of artificial insemination used gonadotropin-releasing hormone (GnRH)-based fixed-time artificial insemination protocol in the control and test groups. The test group received artificial insemination based on the estrus prediction made by the biosensor, and the control group received artificial insemination according to visual estrus observation. Before artificial insemination, the ruminoreticular temperature was maintained at an average of 38.95 ± 0.05℃ for 13 h (-21 to -9 h), 0.73℃ higher than the average temperature observed at -48 h (38.22 ± 0.06℃). The body activity, measured using an indwelling 3-axis accelerometer, averaged 1502.57 ± 27.35 for approximately 21 h from -4 to -24 h before artificial insemination, showing 203 indexes higher body activity than -48 hours (1299 ± 9.72). Therefore, using an information and communication techonology (ICT)-based biosensor is highly effective because it can reduce the reproductive cost of a farm by accurately detecting estrus and increasing the rate of estrus confirmation in cattle.

• 한국동물생명공학회지
• /
• 제38권4호
• /
• pp.215-224
• /
• 2023

Background: Reproductive management practices play crucial roles to maximize the reproductive performance of cows, and thus contribute to farm profitability. We aimed to assess the reproductive management of cows currently practiced in the dairy farms in an urban farming system. Methods: A total of 62 dairy farms were randomly selected considering all size of farms such as small (1-5 cattle), medium (6-20 cattle) and large farms (> 20 cattle) from selected areas of Dhaka city in Bangladesh. The reproductive management-related parameters viz. estrus detection, breeding method, pregnancy diagnosis, dry cow and parturition management, vaccination and treatment of reproductive problems etc. were obtained in a pre-defined questionnaire during the farm visit. Results: The visual observation method was only used (100.0%; 62/62) for estrus detection irrespective of size of the farms; while farmers observed cows for estrus 4-5 times a day, but only for 20-60 seconds each time. Regardless of farm size, 89.0% (55/62) farms used artificial insemination (AI) for breeding the cows. Intriguingly, all farms (100.0%) routinely checked the cows for pregnancy at 35-40 days post-breeding using rectal palpation technique by registered veterinarian. However, only 6.5% (4/62) farms practiced dry cow management. Notably, all farms (100.0%) provided nutritional supplements (Vit D, Ca and P) during late gestation. However, proper hygiene and cleanliness during parturition was not practiced in 77.4% (48/62) farms; even though 96.7% (60/62) farms treated cows by registered veterinarian for parturition-related problems. Conclusions: While farmers used AI service for breeding and timely check their cows for pregnancy; however, they need to increase observation time (30 minutes/ observation, twice in a day: early morning and early night) for estrus detection, consider dry cow management and ensure hygienic parturition for maximizing production.

• Ocean and Polar Research
• /
• 제35권3호
• /
• pp.229-237
• /
• 2013

We measured two-dimensional (2-D) oxygen distribution in the surface sediment layer of intertidal sediment using a simple and inexpensive planar oxygen optode, which is based on a color ratiometric image approach. The recorded emission intensity of red color luminophore light significantly changed with oxygen concentration by $O_2$ quenching of platinum(II)octaethylporphyrin (PtOEP). The ratios between the intensity of red and green emissions with oxygen concentration variation demonstrated the Stern-Volmer relationship. The 2-D oxygen distribution image showed microtopographic structure, diffusivity boundary layer and burrow in surface sediment layer. The oxygen penetration depth (OPD) was about 2 mm and the one-dimensional vertical diffusive oxygen uptake (DOU) was 12.6 mmol $m^{-2}d^{-1}$ in the undisturbed surface sediment layer. However, those were enhanced near burrow by benthic fauna, and the OPD was two times deeper and DOU was increased by 34%. The simple and inexpensive oxygen planar optode has great application potential in the study of oxygen dynamics with high spatiotemporal resolution, in benthic boundary layers.

• 조명전기설비학회논문지
• /
• 제21권5호
• /
• pp.75-81
• /
• 2007

본 논문에서는 전기안전에 대한 부가서비스 같은 저전압 전기설비의 온라인 감시시스템 구축을 위한 국내외 실태조사를 수행하였다. 일본은 미래 정보화 사회를 위해 IT 기본법에 근거한 온라인 전기설비 감시시스템 서비스를 실시하고 있으며, 전기안전뿐만 아니라 지진이나 방범등의 부가서비스를 실시하고 있었다. 미국 및 유럽에서는 전력선 통신을 사용하여, 온라인 감시 및 빌딩군 관리 서비스를 실시하고 있었다. 국내에서도 전기안전과 관련하여 디지털 수배전반 등을 통해 누설전류 측정, 부하관리 등에 대한 서비스를 일부 기업에서 서비스를 실시하고 있었다. 실태조사를 통해, 국내에서도 시장 활성화를 위한 법, 제도적 개선이 필요할 것으로 판단된다.

• 한국정보과학회논문지:데이타베이스
• /
• 제37권1호
• /
• pp.50-55
• /
• 2010

블로그 서비스 시스템에 존재하는 중복문서는 블로그 검색의 서비스 질과 성능을 저하시키는 요인 중 하나이다. 기존의 웹 페이지 환경에서와는 달리, 블로그 서비스 시스템에서는 각 문서의 생성이 매번 보고되기 때문에 문서 생성 시점에 중복 판정이 가능하다. 본 논문에서는 이 점에 착안하여 문서를 저장하는 시점에 해당 문서의 중복 여부를 판정하는 새로운 중복문서 검출 기법을 제안한다. 제안된 기법을 통하여 검출된 중복문서는 검색 엔진을 위한 인덱싱에 반영시키지 않음으로써 중복문서가 검색 결과에 반영되는 문제를 원천적으로 방지할 수 있다. 또한, 효과적인 중복문서 검출을 위하여 3가지 인덱싱 기법을 제안하며, 실제 블로그 데이터를 이용하여 각 인덱싱 기법 중 가장 효율적인 기법을 보인다.

• 대한수학교육학회지:학교수학
• /
• 제7권4호
• /
• pp.337-352
• /
• 2005

본 연구에서는 학교수학수업에의 공학적 도구 활용을 논의의 주제로 설정하고 예비수학교사교육에서 사례연구를 실시하였다. 예비관찰을 통해 사례로 선정된 사범대학 재학생들을 대상으로 수학교육프로그램을 활용하여 7${\~}$9단계 수학 학습에 적용할 수 있는 교수-학습 자료를 개발하는 수업활동을 시행하였다. NCTM과 제7차 교육과정의 교수-학습방법 제안을 배경으로 하여 본 연구에서는 공학적 도구를 활용하여 수학학습의 효과를 높일 수 있다는 명제를 개념적 틀로 설정하였다. 그리고 이를 연구의 방향과 자료분석의 토대로 삼았다. 연구과정에서 수집된 관찰자료, 면담자료, 문서자료 등을 토대로 연구의 초기에 설정된 세 가지 연구문제에 대한 결과를 분석하였다. 아울러 학교현장의 수학수업에 활용할 수 있는 공학적 도구 활용교수${\cdot}$학습 보조자료를(단계별 수학디자인 산출물) 개발하여 제시하였다.

• 한국전자거래학회지
• /
• 제16권4호
• /
• pp.97-108
• /
• 2011

소규모 IT 서비스 기업은 대기업에 비하여 상대적으로 한정된 자원과 인력으로 기업 활동을 수행하고 있으며, 실제 가치를 창출하는 방법에 따라 다양하게 분류될 수 있다. 그러나 현재까지의 정보보호에 관한 연구는 기업규모 및 비즈니스 특성을 고려하지 않은 일반적인 정보보호 대책수립 과정을 진행하여 왔다. 따라서 본 연구에서는 보안대책 수립에 기초가 되는 핵심 정보자산식별 과정을 소규모라는 기업규모와 IT 서비스라는 비즈니스 특성을 고려하여 추출 분류하였다. 세부적으로 정성적 관찰 작업을 통하여 비즈니스 서비스 시나리오 설계에 따른 핵심 정보자산을 식별하고, 통계적 방법을 통하여 식별된 핵심 정보자산에 대한 검증작업을 수행하였다. 향후 본 연구는 소규모 IT 서비스 기업을 위한 특화된 정보보호 대책 개발과정에서 기초자료로 활용될 수 있을 것으로 예상된다.