• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2003년도 추계학술대회 및 정기총회
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• pp.21-24
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• 2003

$\ulcorner$Cost Effectiveness Analysis$\lrcorner$ has been widely used to evaluate the effectiveness of R＆D resources. But, almost of cost effectiveness evaluation systems have some problems, especially the cross effect among R＆D projects has not been considered. To solve this problem, we have designed a new $\ulcorner$Cross Effect Evaluation System(CEES)$\lrcorner$, which are able to estimate multi-effects and cross effects by completion time among several projects.

• International Journal of Control, Automation, and Systems
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• 제1권3호
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• pp.339-350
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• 2003

In this paper, we propose a simultaneous multithreading (SMT) architecture that improves instruction throughput by exploiting instruction level parallelism (ILP) and thread level parallelism (TLP). The proposed architecture issues and completes instructions belonging to the same thread in exact program order. The issue and completion policy greatly reduces the design complexity and hardware cost of our architecture, compared with others that employ out-of-order issue and completion. On the other hand, when the instructions belong to different threads, the issue and completion orders for those instructions may not necessarily be identical to the fetch order. The processor issues instructions simultaneously from multiple threads to functional units by exploiting ILP and TLP, and by dynamic resource sharing. That parallel execution notably improves performance and resource utilization with minimal additional hardware cost over the conventional superscalar processors. This paper proposes an SMT architecture with grouping as well as one without grouping. Without grouping, all threads dynamically and flexibly share most resources. On the other hand, in the SMT architecture with grouping, in which resources and threads are divided into several groups for design simplification, resources are shared only among threads belonging to the same group as those resources. Simulation results show that our processors with four and eight threads improve performance by three or more times over the conventional superscalar processor with comparable execution resources and policies, and that reasonable grouping reduces the design complexity of SMT processors with little negative effect on performance.

• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2021년도 학술논문집
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• pp.159-165
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• 2021

4차 산업혁명과 최근 코로나19 팬데믹 상황을 겪으며 SW교육의 필요성과 중요성이 더욱 강조되고 있다. 하지만 2015 개정 교육과정에 편성된 17차시의 내용만으로는 학생들의 컴퓨팅 사고력 신장 효과를 거두기에 어려움이 있다. 더욱이 작년부터 이어지는 코로나19 상황으로 교육현장에서 학생들에게 동등한 SW교육이 이뤄지는 데에 환경적 제약이 있는 상황이다. 본 연구에서는 현재 교육현장의 상황을 반영하여 완성형 로봇을 활용한 언플러그드 수업을 설계하고 J초등학교 6학년 학생들에게 SW교육의 경험을 제공하였다. 또한 수업 적용을 통하여 로봇을 활용한 언플러그드 수업이 학생들의 SW교육에 대한 인식 변화와 컴퓨팅사고력 활용에 영향을 미치는지 확인해보았다. 그 결과, 로봇을 활용한 언플러그드 수업을 통해 학생들은 컴퓨팅 사고력을 활용하여 주어진 문제를 해결하였으며 SW교육에 대한 인식 변화에도 긍정적인 영향을 주었음을 알 수 있었다.

• Journal of Hospice and Palliative Care
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• 제23권2호
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• pp.71-84
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• 2020

Purpose: The purpose of this systematic review and meta-analysis was to investigate the effects of advance care planning on end-of-life decision-making. Methods: Databases including RISS, KISS, KMbase, KoreaMed, PubMed (MEDLINE), Embase, and CINAHL were searched for studies that examined the effects of advance care planning interventions. The inclusion criteria were original studies in English or Korean; adults ≥18 years of age (population); advance care planning (intervention); completion of advance directives (AD) or advance care planning (ACP) (outcomes); and randomized or non-randomized controlled trials (RCTs and non-RCTs, respectively) (design). Study quality was measured using the checklists of the Joanna Briggs Institute. Meta-analyses were conducted with the Comprehensive Meta-Analysis program. Results: Nine RCTs and nine non-RCTs were selected for the final analysis. The effect sizes (ES) of the outcome variables in nine RCTs were meta-analyzed, and found to range from 0.142 to 0.496 for the completion of AD and ACP (ES=0.496, 95% CI: 0.157~0.836), discussion of end-of-life care (ES=0.429, 95% CI: -0.027~0.885), quality of communication (ES=0.413, 95% CI: 0.008~0.818), decisional conflict (ES=0.349, 95% CI: -0.059~0.758), and congruence between preferences for care and delivered care (ES=0.142, 95% CI: -0.267~0.552). Conclusion: ACP interventions had a positive effect on the completion of AD and ACP. To apply AD or ACP in Korea, it is necessary to develop ACP interventions that reflect aspects of Korean culture.

• 대한방사선기술학회지:방사선기술과학
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• 제40권1호
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• pp.127-134
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• 2017

본 연구는 실내 라돈 가스의 농도를 낮추기 위한 방법을 찾기 위해 건물의 준공연도, 건물의 용적, 환기 세 가지 변수에 따른 실내 라돈 농도를 비교, 측정하여 그 영향을 알아보고자 한다. 측정은 1973년에 건축이 되었고, 2011년에 증축이 된 건물의 6층을 대상으로 용적이 서로 다르고 준공연도가 1973년과 2011년인 6개의 강의실을 측정하였다. 준공연도에 따른 라돈농도를 비교하기 위해 4개의 강의실을 선정하였고, 용적에 따른 라돈농도를 비교하기 위해 준공연도가 같고 용적이 다른 강의실을 선정하였고, 환기에 따른 라돈농도를 비교하기 위해 6개의 강의실의 폐쇄와 환기를 시행하였다. 결과적으로 준공연도에 따른 라돈농도는 최근에 지어진 건물에서 라돈농도가 최대 4배 높게 나타났으며, 용적에 따른 라돈농도는 용적이 작을수록 높게 나타났다. 환기에 따른 라돈농도의 변화는 폐쇄 시보다 환기를 할 경우 약 80%의 감소율을 보였다. 특히, 준공연도가 최근이면서 용적이 작을수록 라돈농도가 높게 검출되었고, 세 가지 변수 중 환기가 라돈농도 감소에 가장 큰 영향을 끼쳐 라돈에 의한 피폭감소 효과를 기대할 수 있을 것으로 사료된다.

• 산업경영시스템학회지
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• 제36권4호
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• pp.130-137
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• 2013

In this paper, we consider a two-agent scheduling with sequence-dependent exponential learning effects consideration, where two agents A and B have to share a single machine for processing their jobs. The objective function for agent A is to minimize the total completion time of jobs for agent A subject to a given upper bound on the objective function of agent B, representing the makespan of jobs for agent B. By assuming that the learning ratios for all jobs are the same, we suggest an enumeration-based backward allocation scheduling for finding an optimal solution and exemplify it by using a small numerical example. This problem has various applications in production systems as well as in operations management.

• 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.

• Plant Resources
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• 제5권1호
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• pp.70-73
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• 2002

To develop an optimal storage method of root of Angelica acutiloba Radix, which has been grown as major herbal medicine material to be cultivated, root of Angelica acutiloba Radix, was stored for 10 months with different packing materials and sealing methods. The loss in dry weight as influenced by packing materials and sealing methods was the lowest at vacuum packing and followed by complete sealing methods with transparent polyethylene film. The ratio of root rot during the storage period was not significantly different between packing materials but was significantly different between sealing conditions. In conclusion, vacuum packing and complete sealing with polyethylene film appears to be most optimal for storage of Angelica acutiloba Radix.

• 대한인간공학회지
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• 제24권1호
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• pp.19-26
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• 2005

Mobile internet access using such devices as PDAs and cellular phones becomes popular as mobile technologies grow. However, the characteristics of small screen devices such as small screen size and pen-based input cause many usability problems. In this study, a human factors experiment was conducted to identify the factors affecting the usability of information search on a PDA. Factors manipulated in the experiment included use of wheel equipment, scroll dimension, and screen orientation. Task completion time, error frequency, and subjective satisfaction level were measured. In addition, various users' behavioral patterns such as scanning routes and mainly used scrolling methods were analyzed. Scroll dimension has a significant effect on task completion time. Scroll equipment and screen orientation affect subjective satisfaction level. The results could be applied to designing information structure of web sites for mobile use by providing vertical scroll and using external scroll equipments.

• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 International Conference
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• pp.126-131
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• 2007

Most Internet auction studies have focused on examining the determinants of auction success or closing price. However, there has been little previous research which investigates dark-side factors such as overbidding behavior in the Internet C2C transactions. For this reason, this study attempts to find situations with the escalation of commitment to bids using Internet auction systems and also examines whether the bidder's bidding is irrational. Therefore, this study applies escalation of commitment to explain the auction process such as the "going, going, gone period" with competition in Internet C2C auctions. In order to describe the auction process in terms of escalation of commitment, this study proposes psychological sunk costs, completion effect, and self-justification as the key factors of escalation of commitment and also willingness to continue bidding reflecting the decision maker's escalation behavior in terms of persistence perspective as final dependent variable. The results of PLS analysis indicate that a bidder's overbidding behavior is explained by the escalation of commitment.