• Geomechanics and Engineering
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• 제19권6호
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• pp.523-532
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• 2019

Based on the formation characteristics, wellbore parameters and insulated tubing (IT) parameters of the Shengli oilfield, Shandong, China, a geomechanical model is built to predict the temperature distributions of the wellbore and formation. The effects of the IT heat conductivity coefficient (HCC), well depth and IT joint on the temperature distribution of the IT, completion casing, cement sheath, and formation are investigated. Results show the temperature of the formation around the wellbore has an exponentially decreasing relation with the distance to the wellbore. The temperature of the formation around the wellbore has an inverse relation with the IT HCC when the temperatures of the steam and the formation are given. The temperature of the casing outer wall is mainly determined by the steam temperature and IT HCC rather than by the initial formation temperature. The temperature of the casing at the IT joint is much larger than that of the other location. Due to the IT joint having a small size, the effects of the IT joint on the casing temperature distribution are limited to a small area only.

• 대한인간공학회지
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• 제23권2호
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• pp.25-36
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• 2004

The effects of task characteristics on the relative efficiency of visual display dimension were studied using a simulated tele-robotic task. Through a conventional method of task analysis. the tele-robotic task was divided into two categories: the task element requiring focused attention (FA task) and the task element requiring global attention (CA task). Time-ta-completion data were collected for a total of 120 trials involving 10 participants. For the CA task. there was no significant difference between the multiple two-dimensional (20) display and the three-dimensional (3D) monocular display. For the FA task. however. the multiple 20 display was superior to the 3D monocular display. The results suggest that the characteristics of a given task have a considerable effect on the choice of display dimensionality and the multiple 3D display is better for human operators to effectively judge depth if the task requires frequent use of focused attention.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 1995년도 추계학술대회논문집
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• pp.41-45
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• 1995

Menu-driven interfaces are frequently employed for user -system interfaces on many electronic products. Due to the space and budget constraint, a single or multi-line display is used to show menu items. Single or Multi-line display present 8 .approx. 21 characters on an LCD screen and users select items using a series of button pushes. Multi-line displays are different from the single-line ones in the following aspects. First, they can present multiple menu items at the same time. Second, they can present menu items in a various way, for example, same-depth presentation, sub-depth presentation, previous selection, etc. In this study, a human factors experiment is being conducted to examine the effects of three independent variables on the design of a multi-line display. Factors investigated include menu structure, number of lines on the display, item presentation methodl. Usability of the multi-line display is being measured quantitatively in terms of four different aspects: task completion time, accuracy, inefficiency, user preference. A set of design guidelines will be drawn from this study which can be applied to usef-system interfaces of a various types of consumer products.

• 한국농공학회논문집
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• 제46권4호
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• pp.3-11
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• 2004

A finite volume model is developed to simulate the surface irrigation at a paddy field. The model's capabilities are validated through comparison with the simulafed results and the observed data obtained by various experimental tests, and the simulated results are in good agreement with the observed pending depth. The result of surface irrigation simulation shows that the longer the paddy field's the length of long-sided becomes, the longer the advance and storage time is taken. To analyze surface irrigation performance with variable inflow rate, three patterns of flow variation-constant rate, initially high then low, and initially low then high-were studied. The results show that at the pattern with initially high followed by low during the latter half of the irrigation the advance time is shortest, but the pending depth of irrigation completion and irrigation effiency are the little difference between irrigation patterns.

• 비교교육연구
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• 제28권4호
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• pp.23-49
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• 2018

본 연구의 목적은 캘리포니아 주의 학점제 기반 고등학교 교과목 이수 체제에 대한 고찰을 통해 향후 우리나라 고교학점제 운영에 있어서 검토되어야 할 시사점을 탐색하는 것이다. 이를 위해 미국의 학점제 교육과정의 특징, 미국 캘리포니아 주 고등학교의 학점제 기반 교과목 이수 체제를 분석하였다. 캘리포니아 주는 주 수준에서 교과군별 졸업 최저 이수 학점을 제시하고, 교육구에서는 대학입학요강, 학생의 필요와 요구를 고려하여 교육구 수준의 교과군별 졸업 최저 이수학점을 제시한다. 학교 수준에서는 교육구 수준에서 제공되는 과목의 교수요목에 기초하고, 주 수준의 교육과정 기준을 기반으로 하여 과목을 개발하게 된다. 주에서 교육구, 교육구에서 단위 학교 수준으로 갈수록 졸업에 필요한 이수 학점이 높게 설정된다. C학점 이하이면 학점을 받지 못하게 되고, 재이수를 하게 된다. 학생들은 진로 상담 교사, 학부모와의 면담을 통해 다양한 경로를 활용하여 졸업이수 학점을 이수하게 된다. 캘리포니아 주의 고등학교 교과목 이수 체제 분석결과에 근거하여 우리나라의 고교학점제의 성공적 안착을 위해서 고려되어야 할 점으로 '현행 졸업 이수 단위의 적정성 검토', '유의미한 과목 개설을 위한 시 도 교육청 및 단위 학교 수준의 노력 필요', '과목 이수 기준 설정에 따른 후속 조치의 마련', '학생 선택의 질적 측면 제고', '유의미한 선택을 위한 진로 코칭의 활성화', '고등학교 교육과정과 대학 입시와의 연계성 수준 설정', '학점제 기반 외국고등학교 교육과정에 대한 심층적인 후속 연구' 등을 제안하였다.

• Educational Technology International
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• 제17권1호
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• pp.117-150
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• 2016

The purpose of this study was to develop design guidelines on the learning analytics which can help to promote students' self-regulated learning (SRL) strategies in MOOCs learning environments. First of all, to develop the first draft of design guidelines, relevant literature review and case analysis on current MOOCs platforms such as edX, K-MOOC, Coursera, Khan Academy and FutureLearn were conducted. Then, to validate the design guidelines, expert reviews (validation questionnaires and in-depth interviews) and learner evaluation (in-depth interviews) were conducted. Through the recursive validation, the design guidelines were finalized. Overall, the final version of design guidelines on learning analytics to facilitate SRL strategies was suggested. The final design guidelines consist of 15 items in 10 categories related to the information analyzed based on individual student's learning behaviors and activities on MOOCs environments. Moreover, the results of interview also revealed that the social comparisons, learning progress reports, and personalization might contribute to the improvements of their SRL competences. This study has an implication that MOOCs could offer a higher success or completion rate to students with low SRL skills by taking advantage of the information on learning analytics

• 토지주택연구
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• 제6권4호
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• pp.221-229
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• 2015

아파트 단지 내 대형교목은 공동주택 외부환경의 질적 수준을 좌우하는 주요한 요인이다. 이것은 단지의 랜드 마크적 활용 및 공간 상징성 제고를 위한 목적으로 활용된다. 그러나 대형교목의 식재는 높은 유지관리비용 및 하자의 발생으로 오히려 외부환경의 질적 저하를 초래하는 요인이 되기도 한다. 이에 본 연구는 공동주택 인공지반에 식재되는 대형 교목을 대상으로, 식재실태를 분석하여 대형교목의 식재 개선방향 제시를 목적으로 한다. 이를 위해 3개 대상지의 대형교목(R20이상) 총 265주를 대상으로, 조경설계계획 및 현장설계 변경사항, 그리고 준공실태를 관련 설계도서 및 현장 조사를 기반으로 식재 현황 및 최소 생육 토심, 추가 토심조치 유형 등을 조사하였다. 그 결과, 공동주택의 대형교목 조경설계는 85% 심근성 수종으로 평균 R35의 대형교목이 인공지반에 식재되고, 평균 65cm 최소 생육 토심이 부족한 것으로 조사되었다. 그리고 현장설계변경은 주로 R30과 R40의 특정 규격에 한정된 검토가 이루어지고, 부족 토심에 대한 추가계획 등은 수반되지 않고 있는 것으로 조사되었다. 다음으로, 추가 토심 확보방안으로 85%가 마운딩으로 조치하였으나, 만족율은 10%내외로 매우 낮아, 조치방법에 문제가 있음을 지적하였다. 또한 대형 교목의 규격과 뿌리근 특성 이외에, 식재 입지선정이 최소 생육 토심 확보에 주요한 요인임을 지적하고, 식재계획 시 개선방안을 제시하였다.

• 성인간호학회지
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• 제28권4호
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• pp.470-481
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• 2016

Purpose: The purpose of this study was to explore self-management support experiences among breast cancer survivors. Methods: Individual in-depth interviews were performed for survivors who had treated breast cancer after completion of chemotherapy and radiation therapy. Data were collected from April 2014 to July 2014 and analyzed using phenomenological method by Colaizzi. Results: Five essential themes were found as follows: 1) Need for continuous help and support to maintain self-management, 2) Need for professional resources to carry out regular exercise, 3) Overcoming psychological difficulties through others rather than health care professionals, 4) Disappointment with time with and circumstances of health care consultation, 5) Dependence on means of media for health related information. Conclusion: The results might contribute to an understanding of self-management support experienced by breast cancer survivors in Korea. It is suggested that evidence-based program for self-management support should be developed and applied to nursing intervention for breast cancer survivors.

• 대한산업공학회지
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• 제18권2호
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• pp.141-147
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• 1992

This article evaluates the efficiency of three branch-and-bound heuristics for a job scheduling problem that minimizes the sum of absolute deviations of completion times from a common due date. To improve the performance of the branch-and-bound procedure, Algorithm SA is presented for the initial feasible schedule and three heuristics : breadth-first, depth-first and best-first search are investigated depending on the candidate selection procedure. For the three heuristics the CPU time, memory space, and the number of nodes generated are computed and tested with nine small examples (6 ${\leq}$ n ${\leq}$ 4). Medium sized random problems (10 ${\leq}$ n ${\leq}$ 30) are also generated and examined. The computational results are compared and discussed for the three heuristics.

• The Journal of Korean Physical Therapy
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• 제27권1호
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• pp.68-77
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• 2015

Purpose: This study was conducted in order to explore home visiting therapists' self-perceived role, problems, and supplement points of the home-based rehabilitation (HR) program based on the community-based rehabilitation (CBR) model. Methods: Four home visiting physical therapists, who conducted the HR program, participated in this study. After completion of the HR program, in-depth interviews were conducted using a semi-structured questionnaire for participants to explore their self-perceived role, problems, and supplement points of the HR program. Results: Participants regarded the role of the HR program as for "the linkage between recipient & society", "maintenance & improvement of recipients' physical function", and "education of recipient about the way of self rehabilitation". The problems and supplement points were derived from all phases of the HR program, including "human & material resources", "training program for human resources for HR service", "selection of recipient of HR service", "contents of the intervention for HR service", and "duration of HR service". Conclusion: These findings indicate that participants well recognized the intention of the HR program based on the CBR model, and suggest that high-quality human resources with rich expertise and experiences, a training program for HR service led by experts, and selection of recipients led by experts are necessary for an effective HR program. In addition, strategies and capacities specified to HR service should be identified, and applied to the training program for human resources for HR service. The results of this study could provide useful information when the government decides on the next guideline for home visiting health service.