• 한국수학교육학회지시리즈E:수학교육논문집
• /
• 제30권2호
• /
• pp.139-159
• /
• 2016

본 연구는 수학교육의 현장을 교실이 아닌 교실 밖으로 확장할 수 있다는 것을 전제로 진행되었다. 최근 수학교육은 다양한 현장체험활동, 실생활을 기반으로 한 수학교육 등의 중요성이 증가되고 있고, 이로 인해 예비교사교육에서도 이에 대한 고려가 필요한 실정이다. 이에 본 연구에서 예비수학교사를 대상으로 수학답사활동을 진행하고, 그 구체적인 적용 결과를 분석하였다. 우리 고유의 역사적 문화재 속에서 실시한 예비교사의 수학답사활동 전후에 대한 인식의 변화에 대한 양적 분석과 더불어, 수학답사활동의 목적인 인지적 효과, 정의적 효과, 문화-수학적 효과, 수학수업 개선 효과 및 수업목표지식, 수업내용지식 측면에서 질적 분석을 실시하였다. 연구결과 수학답사활동은 예비수학교사에게 유의미한 효과가 있는 것으로 나타났고, 새로운 교수학습 방법으로 정착하기 위해 지속적인 연구가 기대된다.

• 대한교통학회지
• /
• 제24권3호
• /
• pp.197-205
• /
• 2006

본 연구에서는 복합대중교통체계 하에서 환승을 명확하게 반영하면서 신교통수단의 수요를 분석할 수 있는 분석기법을 제안하였다. 제안된 분석방법은 통행특성별로 그룹을 나누어 각 그룹별로 별도의 적합한 교통수요모형을 적용함으로써 좀 더 현실적인 교통수요분석이 가능하도록 하였다. 구체적으로 신교통수단만 이용하는 통행수요(신교통수단 노선구간 내 통행), 신교통수단을 이용하여 출발하거나 도착하는 통행수요(신교통수단 노선구간 내-외부 통행), 신교통수단의 노선을 통과하는 통행수요(신교통수단 노선구간 통과 통행)로 구분하여 통행의 특성별로 적합한 교통수요분석방법을 별도로 적용할 것을 제안하였다. 또한 본 연구에서는 신교통수단 정책과 같이 승용차에서 대중교통으로의 수단 전환이 가능한 정책 분석에서 사업 시행시와 사업 미시행시 간의 수단별 O/D 값에 차이가 있을 때에도 동일한 지표에 의해 일관된 정책평가 결과를 제시할 수 있는 통행시간 편익산출 방법도 제안하였다.

• 대한교통학회지
• /
• 제19권6호
• /
• pp.131-142
• /
• 2001

Previous OD matrix estimation methods from link traffic counts have focused on the formulation of mathematical model and its solution algorithm. Thereby those methods have assumed that true or real OD is similar to the target OD and paid little attention to the properties of the change of OD structure. Although it is general situation that each OD pair increases or decreases due to significant land use and to large time variation between target OD with real OD, those methods have set unrealistic assumptions that target OD increases or decreases uniformly and that the OD structure does not change. Therefore those methods have showed poor performance of OD estimation in general situation. To cope with the problem. this paper suggests a new concept of OD matrix structure and shows the shortcomings of previous method′s dependancy on target OD matrix. We divide "OD trips" into "OD scale" and "OD structure". Where OD scale is a quantitative magnitude of OD trips and "OD structure" is ordinal OD scale. This paper use the same solution algorithm developed by Baek et al. (2000) for analysing the OD structure. Results of numerical examples show that the performance of the method is better than that of previous methods, while the previous methods have better performance in estimation only when OD trips increase or decrease. In addition to, if OD structure does not change, the results show that the error of estimation is low relatively regardless of the large difference of trips between target OD and real OD. This paper also shows that the model performance on OD structure and on OD trips is low as the number of origins that OD structure is changed increase. From the results we suggest that the change of OD structure can be more important information than the difference between target OD and real OD in OD estimation steps.

• 한국경영과학회:학술대회논문집
• /
• 대한산업공학회/한국경영과학회 1996년도 춘계공동학술대회논문집; 공군사관학교, 청주; 26-27 Apr. 1996
• /
• pp.658-661
• /
• 1996

Information that can be obtained from nuclear power plant trip cases is important for the efforts to reduce the trip occurrences. However, trip case reports, generally printed in documents, have shortcomings in using the contents. A database system called Information System of Trip Event Cases (INSTEC) is being developed to improve the use of trip information. INSTEC will provide the information obtained from the analysis of Korean nuclear power plant trips, such as component failures or human errors that induced the trips, problems contributed to the trips, and the sequence of unit events. In this study, in the process of INSTEC development, information analysis has been performed and a prototype of the system was developed. The prototype of INSTEC with user interface was presented to plant personnel to collect their opinion on INSTEC by using a questioninnaire. As results, it is confirmed that INSTEC would be helpful and useful for plant personnel to review the trip case information.

• 대한교통학회:학술대회논문집
• /
• 대한교통학회 2007년도 제55회 학술발표회논문집
• /
• pp.181-190
• /
• 2007

본 연구는 기존의 통행수단선택에 관한 연구들이 주로 다룬 개인 및 가구의 사회경제적특성에 관한 변수를 비롯하여 통행이 발생하는 지역의 특성에 관한 여러 가지 변수를 고려하여 통행수단 선택에 미치는 영향을 알아보고자 한다. 분석대상은 첨두시와 비첨두시의 대표적인 목적통행인 출근통행과 쇼핑통행으로 삼았으며 승용차, 버스, 지하철에 관한 다항로짓모형을 이용하였다. 연구결과, 변수들이 목적통행별로 상이한 영향을 미쳤고, 지역특성변수들이 모형의 설명력을 높여준다는 것을 알 수 있었다.

• Nuclear Engineering and Technology
• /
• 제28권6호
• /
• pp.563-575
• /
• 1996

A total of 77 cases was identified to have human errors from a total of 255 trips occurred from 1978 to 1992 in Korean NPPs. The cases were analyzed to investigate how many human errors occurred on which work conditions to find out the areas of high priority for human error reduction. For the analysis of the 77 trip cases due to human errors, classifications were made for the following four categories ; plant systems, work situation, job types, and error types. Erroneous tasks critically influencing the plant trips were carefully identified and analyzed according to the classifications. Based on the results for the individual cases, the cases were counted for the classification items in each of the four categories, then also for the group of categories to investigate the relationships among the categories in aspects of human error occurrences. As results, the plant systems, work situations, and job types, and error types that are dominant in human errors related to the trips ore identified.

• Nuclear Engineering and Technology
• /
• 제27권1호
• /
• pp.96-104
• /
• 1995

EPRI URD requires that the reactor be capable of accommodating an unintended CEA drop without initiating a trip and operating at a reduced power with ay single CEA fully inserted. YGN 3 and 4 reactors have 12-finger CEAs, and the CPCS will trip the reactor due to their large reactivities when one of them is dropped at a high power. The ABB-CE reactor power cutback system has been proposed to be used against the 12-Finger CEA drop to avoid the reactor trips. The results of study show that the reactor power cutback can prevent the reactor trips of the 12-Finger CEA drop when the CPCS has enough operating thermal margin (more than 9％ for YGN 3&4 Cycle 1). It is noted, however, that the probability of a 12-Finger CEA drop is very low, less than one per 100 reactor years for YGN 3& and System 80$^{+}$ plants.

• 자원ㆍ환경경제연구
• /
• 제19권3호
• /
• pp.547-569
• /
• 2010

다목적지 여행은 이미 오래 전부터 그 현상의 보편성 및 중요성을 인정받아 왔으나 그동안의 휴양수요 연구에서는 많이 다루어지지 못하였다. 본 연구는 특정 휴양자원이 갖는 중요한 외부환경 요소로서 다목적지 여행 기회의 편익을 추정하고자 하였다. 이를 위하여 다목적지 여행에 참가한 설악산 국립공원 방문객을 조사하였으며, 이들의 다수 목적지 선택행위를 혼합로짓모형을 추정하여 분석하였다. 분석 결과는 설악산 주변 휴양지가 제공하는 다목적지 여행 기회의 구체적인 편익을 보여주고 있다.

• 정보와 통신
• /
• 제10권8호
• /
• pp.77-87
• /
• 1993

There has been increasing attention paid to the influence of fascimile type of technologies on transportation costs. This attention is noticeable in large business companies, as fascimile become widely available in Korea. The importance of the fascimile usage is that it might effectively substitute for transportation, thereby reducing transportation costs. This paper presents an analysis of cost saving resulting from fascimile usage for substitutable trips. Data were collected from business companies on various aspects of the fascimile usage patterns, with particular emphasis on usage behavior substitutable for trips. Although by no means comprehensive, the analysis revealed that significant benefits can be derived from the usage of fascimile for substitutable trips in business settings. The results of benefit estimation show that net benefits turn out to be 7,608 won and 5,055 won per one usage for large and small companies respectively. If traffic congestion were to be considered, total social benefits would be higher.

• 한국수학교육학회지시리즈A:수학교육
• /
• 제54권1호
• /
• pp.31-47
• /
• 2015

School Math Field Trips(SMFT) for School Mathematics can be defined as teaching and learning activity of mathematics going into the field of Korean history, culture, science and technology. This is a literature analysis study to systemize teaching and learning method of mathematics based on literature analysis and real SMFT activity. First, SMFT was introduced to improve cognitive affective and cultural-mathematical teaching and learning method of mathematics. Second, SMFT has three purposes of cognitive, affective and cultural-mathematical. Third, to conduct mathematical education activity the direction of teaching was set. Forth, the progressing way of developing material and SMFT was researched. Fifth, developing the evaluation standard of SMFT and evaluation method was suggested.