• 제목/요약/키워드: Choice experiment method

검색결과 75건 처리시간 0.025초

중학교 "환경" 교과의 교수.학습 및 평가 방법 연구 (A Study on Teaching-Learning and Evaluation Methods of Environmental Studies in the Middle School)

  • 남상준
    • 한국환경교육학회지:환경교육
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    • 제7권1호
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    • pp.1-17
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    • 1994
  • This study was performed to determine appropriate teaching-learning and evaluation methods for Environmental Studies. To promote the relevance of our study to the needs of the schools and concerned educational communities of environmental education, we reviewed related literature, conducted questionnaire surveys, interviewed related teachers and administrator, held meetings with experts, and field-tested our findings. For selecting and developing teaching-learning methods of Environmental Studies, findings of educational research in general are considered. moreover, principles of environmental education, general aim of environmental education, orientations of environmental education, and developmental stages of middle school students in educational psychology were attended. In addition, relevance to the purpose of the Environmental Studies curriculum, appropriateness for value inquiry as well as knowledge inquiry, small group centered class organization, social interaction centered teaching-learning process, regional environmental situation, significance of personal environment, evaluation methods of Environmental Studies, multi- and inter-disciplinary contents of the Environmental Studies textbook, suitability to the evaluation methods of Environmental Studies, and emphasis on the social interaction in teaching-learning process were regarded. It was learned the Environmental Studies can be taught most effectively in via of holding discussion sessions, conducting actual investigation, doing experiment-practice, doing games and plate, role-playing and carrying out simulation activities, and doing inquiry. These teaching-learning methods were field-tested and proved appropriate methods for the subject. For selecting and developing evaluation method of Environmental Studies, such principles and characteristics of Environmental Studies as objective domains stated in the Environmental Studies curriculum, diversity of teaching-learning organization, were appreciated. We categorized nine evaluation methods: the teacher may conduct questionnaire surveys, testings, interviews, non-participatory observations; they may evaluate student's experiment-practice performances, reports preparation ability, ability to establish a research project, the teacher may ask the students to conduct a self-evaluation, or reciprocal evaluation. To maximize the effect of these methods, we further developed an application system. It considered three variables, that is, evaluates, evaluation objectives domains, and evaluation agent, and showed how to choose the most appropriate methods and, when necessary, how to combine uses of different methods depending on these variables. A sample evaluation instrument made on the basis of this application system was developed and tested in the classes. The system proved effective. Pilot applications of the teaching-learning methods and evaluation method were made simultaneously; and the results and their implications are as follows. Discussion program was applied in a lesson dealing with the problems of waste disposal, in which students showed active participation and creative thinking. The evaluation method used in this lesson was a multiple-choice written test for knowledge and skills. It was shown that this evaluation method and device are effective in helping students' revision of the lesson and in stimulating their creative interpretations and responces. Pupils showed great interests in the actual investigation program, and this programme was proved to be effective in enhancing students' participation. However, it was also turned out that there must be pre-arranged plans for the objects, contents and procedures of survey if this program is to effective. In this lesson, non-participatory observation methods were used with a focus on the attitudes of students. A scaled reported in general description rather than in grade. Experiment-practice programme was adopted in a lesson for purifying contaminated water and in this lesson, instruction objectives were properly established, the teaching-learning process was clearly specified and students were highly motivated. On the other hand, however, it was difficult to control the class when some groups of students require more times to complete their experiment, and sometimes different results. As regards to evaluation, performance observation test were used for assessing skills and attitudes. If teachers use well-prepared Likert scale, evaluation of all groups within a reasonablely short period of time will be possible. The most effective and successful programme in therms of students' participation and enjoyment, was the 'ah-nah-bah-dah-market' program, which is kind of game of the flea market. For better organized program of this kind, however, are essential, In this program, students appraise their own attitudes and behavior by responding to a written questionnaire. In addition, students were asked to record any anecdotes relating to self-appraisal of changes on one's own attitudes and behaviours. Even after the lesson, students keep recording those changes on letters to herself. Role-playing and simulation game programme was applied to a case of 'NIMBY', in which students should decide where to located a refuse dumping ground. For this kind of programme to e successful, concepts and words used in the script should be appropriate for students' intellectual levels, and students should by adequately introduced into the objective and the procedures of the lessons. Written questionnaire was used to assess individual students' attitudes after the lesson, but in order to acquire information on the changes of students' attitudes and skills, pre-test may have to be made. Doing inquiry programme, in which advantages in which students actually investigated the environmental influence of the areas where school os located, had advantages in developing students' ability to study the environmental problems and to present the results of their studies. For this programme to be more efficient, areas of investigation should be clearly divided and alloted to each group so that repetition or overlap in areas of study and presentation be avoided, and complementary wok between groups bee enhanced. In this programme, teacher assessed students' knowledge and attitudes on the basis of reports prepared by each group. However, there were found some difficults in assessing students' attitudes and behaviours solely on the grounds of written report. Perhaps, using a scaled checklist assessing students' attitudes while their presentation could help to relieve the difficulties.

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활성오니법에 의한 판지폐수중의 COD 제거에 관한 연구 (A Study on the COD Removal in the Paste-board Wastewater by Activated Sludge Process)

  • 도갑수;김영운
    • 기술사
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    • 제18권3호
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    • pp.28-35
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    • 1985
  • As the paper industry consumes much water in process and discharge wastewater containing suspended solid and COD(chemical oxygen demand), relevant law against this discharge has been set up to limit the total containment of COD in discharge. This study has been carried out to improve the treatment method for the soluble COD in wastewater produced during the process of paste-board production, which is made of semichemical pulp and waste paper. Applicated methods are, O$_2$AS : O$_2$ activated sludge process DAS : Deep well activated sludge process SAS : standard activated sludge process and proper combination of DAS and SAS 1) As a result of this experiment, we get the following conclusion between in COD sludge loading "X" and COD removable rate in the process of treating waste-water. COD removable rate(%)=(0.778+0.0146/X)${\times}$100(%)……(7) 2) In case that the COD sludge loading is high, it has been cleared out that the COD removable rate shall become low due to unknown unsoluble substances contained in the process. Meanwhile, to increase the efficiency rate of treatment, it is thought to be necessary, to provide long-time contacts with activated sludge. 3) Once the COD of original waste-water and the target COD of treated water are decided, COD sludge loading is obtained from equation(7), and capacity of aeration tank in the effective systems such as O$_2$AS, DAS, to bet the required COD removable rate can be decided. Therefore the choice among SAS, O$_2$AS, DAS methods is made in consideration of required COD removable rate and allowable installation area. 4) In the sedimentation tank with sludge bulking, it is possible to increase the COD removable rate by 3~7% but still there exist many obstacles to manage this operation.

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영역객체를 위한 리버스 스카이라인 질의 처리 (Reverse Skyline Query Processing for Region Objects)

  • 한아;이종혁;박영배
    • 한국정보과학회논문지:데이타베이스
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    • 제37권4호
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    • pp.185-196
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    • 2010
  • 이전의 리버스 스카이라인 질의 처리 기법들은 고정된 조건 값을 가지는 점객체 환경만을 고려하기 때문에, "가격이 5만원~7만원이고, 해변까지의 거리가 1km~2km인 호텔"와 같이 조건이 범위로 주어지는 영역객체 환경에서의 질의처리에는 부적합하다. 이러한 한계를 극복하기 위하여, 본 논문에서는 점객체 뿐만 아니라 영역객체 또한 지원 가능한 리버스 스카이라인 질의 처리 기법을 제안한다. 이는 첫째, 점객체 환경에서의 리버스 스카이라인 질의처리 기법 중 효율이 좋은 ERSL기법을 확장한 기법으로써 높은 성능을 기대할 수 있다. 또한 둘째, 영역객체와 제안하는 가지치기 기법과의 겹침 관계에 따라 결과객체의 중요도를 다르게 하여 질의자가 결과객체를 차별적으로 사용할 수 있도록 선택권을 제공한다는 새로운 특징이 있다. 본 기법은 영역객체를 지원하는 최초의 기법으로써 성능을 비교할 다른 대상기법이 없다. 그러므로 제안하는 기법의 성능 및 질의결과에 영향을 주는 조건이 무엇이며, 그에 따라 소모되는 실행시간을 측정하여 본 기법의 효율성을 증명하였다.

물방개류 실내 사육법 (Indoor Rearing Method of Diving Beetles: Cybister japonicus, Cybister tripunctatus orientalis, Cybister brevis)

  • 김남정;홍성진;김성현;박해철
    • 한국잠사곤충학회지
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    • 제50권1호
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    • pp.27-32
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    • 2012
  • 점차 희소화되는 물방개류의 서식지내 복원 및 애완곤충 등 곤충산업 소재화를 목표로 실내 사육연구를 수행하였다. 물방개류는 자연상태에서 수초 줄기에 산란하는 습성을 지니고 있어 실내에서 안정적으로 대량생산을 하기 위해서는 인공산란매트 선발이 필요하며 인공산란매트는 사육상자 밑면에 깔아준 모래가 가장 좋은 것으로 나타났다. 또한 유충기(2 3령) 사육에 적합한 먹이원은 연중 안정공급시 가능한 먹이로서 날오징어를 선발하였다. 실내 사육시 개체간 공식행동이 강한 유충 사육을 위해 개체 집단사육시스템을 개발하였다. 또한 용화매트 선발 시험을 한 결과, 흙(자연매트)을 사용할 경우 표면이 쉽게 굳어 물방개유충이 파고들어가기 힘이 들어 용화율이 12~18% 저조하였고 또한 흙 관리 강도가 높았다. 그러나 발효톱밥을 용화매트로 사용할 경우 용화율 80%로 우수하여 물방개류의 용화매트로 가능함을 확인하였다.

조건부가치측정법(CVM)을 활용한 지능형 CCTV 플랫폼의 편익 추정 연구 (A Study on Valuation of Intelligent CCTV Platforms Using Contingent Valuation Method (CVM))

  • 김태균;심동녘
    • 산업융합연구
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    • 제22권7호
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    • pp.1-13
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    • 2024
  • 전자정부 서비스 중 지능형 CCTV 관제 플랫폼은 인공지능을 활용하여 사람, 자동차 등 주요 객체가 CCTV상에 나타났을 경우, 관제요원에게 표출해 주는 선별 관제 서비스이다. 지능형 CCTV 관제 플랫폼을 운영할 경우 비상 상황 발생 시 신속한 대처가 가능하고 민원 해결 증가로 시민들의 삶의 질 제고가 가능할 것으로 기대를 모으고 있다. 이에 본 연구는 비(非)시장재화인 지능형 CCTV 관제 플랫폼의 편익을 선택실험기법인 조건부가치측정법(CVM)을 적용하여 가구당 평균 지불의사액을 추정하고, 이를 토대로 사회적 편익을 계산하였다. 분석 결과 가구의 평균 지불의사액은 연간 6,908원, 국가 전체의 경제적 편익은 연간 약 1,504억 원으로 추정되었다. 본 연구는 그간 환경·공공재의 적용되던 CVM의 적용 범위를 지능형 전자정부 서비스 분야로 확장한 점에서 학술적 의의가 있다. 나아가, 지능형 CCTV 관제 플랫폼 도입이 활발하게 논의되는 현 상황에서, 이에 대한 편익을 화폐가치로 추정하였다는 점에서 실무적 시사점을 지닌다.

3세대 디바이스의 속성별 소비자 선호 분석 (Consumers' preference about the attributes of 3rd generation device)

  • 정재영;이주석;곽승준
    • 한국산학기술학회논문지
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    • 제18권3호
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    • pp.703-710
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    • 2017
  • 3세대 디바이스는 사물인터넷을 통해 지능화된 서비스와 어플리케이션을 활용할 수 있는 차세대 단말기이다. 스마트폰, 태블릿 PC와 같은 기존 스마트 디바이스 시장이 정체기에 접어들면서, 차세대 디바이스 시장을 이끌어 갈 3세대 디바이스 및 부품, 서비스 개발에 세계 각국이 주목하고 있다. 본 연구에서는 3세대 디바이스의 다양한 속성들에 대한 이용자 편익을 경제적 가치평가 방법론을 적용하여 측정해보고자 하였다. 이를 위해 대표적인 가치평가법의 하나인 컨조인트 분석법을 적용하였다. 컨조인트 분석을 위해 3세대 디바이스의 속성을 사용방식, 전력효율성, 라이프케어, 가격의 4가지로 선정했다. 혼합로짓모형을 적용하여 개별 속성들에 대한 한계지불의사액을 도출하였으며, 대부분 통계적으로 유의한 결과를 얻을 수 있었다. 응답자들은 사용방식 속성에서는 완전한 플렉서블 수준에 높은 선호를 보였으며, 전력효율성에 측면에서도 진보된 충전기술에 양(+)의 지불의사를 보였다. 또한 응답자들은 3세대 디바이스가 제공할 일상의 생산성 관리 서비스인 라이프케어 속성의 개선에 대해서도 지불의사가 있는 것으로 확인되었다. 본 연구에서 제시된 정량적 결과와 시사점은 3세대 디바이스 시장을 위한 정책 및 제품, 서비스 전략 수립에 유용하게 활용할 수 있을 것으로 판단된다.

차광제와 이류체 포그시스템을 이용한 고온기 시설내 환경관리 (Optimum Management of Greenhouse Environment by the Shading Coat and Two-fluid Fogging System in Summer Season)

  • 김성은;이재은;이상돈;김학선;전희;정우리;이문행;김영식
    • 생물환경조절학회지
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    • 제24권1호
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    • pp.34-38
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    • 2015
  • 본 실험은 광파장 선택형 차광제와 이류체 포그시스템을 이용하여 고온기 시설내 고온과 건조문제를 해소할 수 있는 적정 냉각법을 구명하기 위하여 수행되었다. 실험처리는 차광제와 이류체 포그시스템을 설치하지 않은 대조구(Non), 이류체 포그시스템만 설치하여 작동한 처리(Fog), 차광제만 도포한 처리(Coat), 외부에 차광제를 도포하고 내부에 이류체 포그시스템을 작동한 처리(F&C) 등이었다. 유입 일사량(열량)은 Non, Fog, Coat, F&C 순으로 많았다. 시설내 기온을 낮추는 방법으로는 이류체 포그시스템이 더 효과적이었다. 또한 이류체 포그시스템을 처리하면 상대습도도 적절히 조절할 수 있었다. 작물의 품온은 다른 처리구에 비해 대조구에서 약 $6^{\circ}C$ 이상 높았다. 연구결과, 고온기 시설내 광, 온도, 상대습도 환경조절에 가장 효과적인 방법은 이류체 포그시스템과 차광제 도포를 함께 하는 것이나, 효과 및 경제성을 함께 고려한다면 이류체 포그시스템을 활용하는 것이 가장 좋은 것으로 판단된다. 그러나 단동하우스의 경우에는 구조적 제약으로 이류체 포그시스템의 설치보다 광선 선택형 차광제를 도포하는 것이 더 좋은 방법으로 사료된다.

중등 과학교사의 과학 평가 실태와 지향 (Secondary School Science Teachers' Actual and Preferred Types of Assessment)

  • 노태희;이재원;강석진;강훈식
    • 한국과학교육학회지
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    • 제35권4호
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    • pp.725-733
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    • 2015
  • 이 연구에서는 중등 과학교사들이 실시하는 과학 평가와 교사들이 지향하는 평가의 사례를 목적과 방법의 측면에서 조사하였다. 연구대상은 중등 과학교사 92명으로, 학교에서 교사가 실시했던 평가 사례와 구성주의적 평가를 실시할 수 있는 전형적인 가상 상황에 대하여 교사가 지향하는 평가 사례를 조사하기 위한 검사지를 개발하였다. 교사의 경력, 평가 관련 교육 경험의 유무, 구성주의적 과학 평가관 수준 등 교사의 특성 변인도 조사하였다. 교사들이 실시하는 과학 평가사례를 분석한 결과, 대부분의 교사는 총괄평가와 같은 전통적인 목적의 평가를 실시하는 경향이 있었고, 선다형 평가와 실험, 보고서, 논술형 평가가 가장 많이 사용되는 평가 방법이었다. 전형적인 평가 상황에서 과학교사들은 다양한 유형의 구성주의적 평가 방법을 지향한 반면, 여전히 전통적 평가 목적에서는 벗어나지 못하였다. 이때, 구성주의적 과학 평가관 수준이 높은 교사가 형성평가를 지향하는 비율은 구성주의적 과학 평가관 수준이 낮은 교사들에 비해 유의미하게 높았다.

The Limiting Sequence and Proper Ratio of Lysine, Methionine and Threonine for Calves Fed Milk Replacers Containing Soy Protein

  • Wang, Jianhong;Diao, Qiyu;Tu, Yan;Zhang, Naifeng;Xu, Xiancha
    • Asian-Australasian Journal of Animal Sciences
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    • 제25권2호
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    • pp.224-233
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    • 2012
  • The limiting sequence and relative ratio of lysine (Lys), methionine (Met), and threonine (Thr) for calves about 2 mo of age fed milk replacers (MR) containing soy protein are not clearly defined. The objective of the study was to investigate the effect of supplementing MR containing 22% CP, half from soy protein concentrate (SPC, 40.56% CP, flour) and half from whey proteins, with Lys, Met, and Thr to estimate amino acid (AA) sequence and their relative ratio for calves about 2 mo of age. A method of partial deduction of AA was adopted. Twenty-four newborn calves (half males and half females, $40.7{\pm}0.9$ kg of BW) were fed 1 of 4 MR diets for 56 d (n = 6/diet). The diets were supplemented with all (positive control) or with 2 of the 3 AAs: Lys, Met and Thr, (i.e., PC (22% CP, 2.34% Lys, 0.72% Met and 1.80% Thr), PC-Lys (22% CP, 1.64% Lys, 0.72% Met and 1.80% Thr), PC-Met (22% CP, 2.34% Lys, 0.50% Met and 1.80% Thr), and PC-Thr (22% CP, 2.34% Lys, 0.72% Met and 1.26% Thr)). Calves were fed thrice daily; starter (20% CP, 1.03% Lys, 0.30% Met and 0.69% Thr), hay (3.23% CP, 0.29% Lys, 0.12% Met and 0.23% Thr) and water were offered free choice. Starter and hay were only offered beginning on d 36 (after 5 wk) and d 43 (after 6 wk), respectively. BW, body size and blood samples measures were taken every two weeks. Three-day total collection of feed refusals, feces, and urine were recorded starting at d 33 and d 54 of age, respectively. From the results, the limiting sequence and relative ratio between the 3 AAs in calves with different diet structures were calculated. The limiting sequence of the 3 AAs were ranked as Lys, Met and Thr; the proper ratio was 100:29:70 for MR-only diet and 100:30:60 for diets consisted of MR, starter and hay. Nitrogen digestion and utilization and nutrient digestibility were negatively affected by AA deletion treatments. From the evidence of this experiment, it did not appear that the AA limiting sequence was selectively altered by differences in diet structures such as would be encountered in practice. The relative ratio between the 3 AAs varied with the offer of starter and hay to calves, and the average ratio was 100:29.5:65 for calves during 2 to 10 wk of age.

The Effects of Hot Temperature on Impulsive Behaviors: The Role of Product Types as a Moderator

  • Ahn, Hee-Kyung
    • Asia Marketing Journal
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    • 제14권3호
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    • pp.27-48
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    • 2012
  • Temperature and weather are all around us, quite literally. Furthermore, temperature and weather not only permeate our atmosphere, constantly affecting our visceral states of warmth and coldness, but they metaphorically permeate our language. People, products, and ideas can all be "hot" or "cold." Given this ubiquity, it is perhaps surprising that relatively little research has systematically examined the influence of temperature on choice and judgment. Temperature-related words such as "hot" and "cold" are often used to describe impulsive and calculated behaviors, respectively. These metaphoric connotations of thermal concepts raise the question as to whether temperature, psychological states and decision making are related to each other, and if so, how. The current research examines these questions and finds support for a relationship. Across one field study and one laboratory experiment, I demonstrate that both hot ambient room temperature (Spa) and hot temperature primes (words) trigger decision outcomes in line with the metaphoric association between hot temperature and impulsivity. In the field study, participants were recruited in hot (40-50 degrees Celsius) and cold (10 degrees Celsius) rooms at a spa. Participants were simply asked to indicate their willingness-to-pay (WTP) for three product categories (travel package, birthday dinner, and cell phone). The results showed that participants in the hot room in comparison to those in the cold room were willing to pay more for the same products. Next, I tested if our results would go beyond ambient temperature and would hold if I were to prime temperature concepts by using a different priming method (i.e., subliminal vs. supraliminal). In line with the previous findings in the spa, participants in the hot priming condition were more likely to choose the wrong answer for the bat and baseball question than those in the cold priming condition. In addition, product type (e.g., pleasure vs. necessity) can moderate the effect of hot temperature on impulsivity. Mood and arousal did not mediate participants' responses. My findings seem to suggest that the effects of temperature on decision outcomes can be attributed to metaphoric associations rather than incidental mood or arousal. The current research applies a novel perspective in understanding the relationship between temperature and judgment and decision making. Also, the results have practical implications for packaging, advertising, merchandising, and pricing of goods and services, as well as for public policy and awareness. One of the most natural implications of my findings would be that retailers would be better off carrying more impulse purchase items on hot days. Furthermore, point-of-purchase promotions encouraging impulse purchase is more likely to be effective in retail environments with higher temperature than with lower temperature. In addition, advertisements and product packages evoking hot temperature associations (e.g., beach, sunshine, summer) might lead consumers to pay higher price for the advertised product than those with cold temperature associations.

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