• 한국수학교육학회지시리즈D:수학교육연구
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• 제19권2호
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• pp.89-100
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• 2015

The study investigated pre-service teachers' knowledge and computational skills by using Triangular Arithmagon. Participants included 90 pre-service teachers from two schools in the United States and Taiwan. The Triangular Arithmagons Test (TAT) was used to measure pre-service teachers' performance in whole number, fractions, and decimals operations (i.e., addition, subtraction, multiplication, and division), each of which included level-1 (basic) and level-2 (advanced) tests. MANOVA analysis was performed to compare the performance between teachers from the United States and Taiwan. Results indicated that overall, pre-service teachers in Taiwan outperformed those in the United States, especially on the advanced-level tests. Pre-service teachers in the United States were found to have poor ability of solving complex operation problems. Different curriculum plans and teaching methods may lead to the performance gap between the two countries.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제5권1호
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• pp.41-55
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• 2001

The purpose of this study was to compare and analyze the curricula of kindergarten and elementary school and to present a plan for connecting the two curricula. The curricula emphasized mathematical thinking and problem solving instead of fragmentary knowledge and adopted the streamed curriculum based on children’s ability and interest. And both of them consisted of number and operation, geometry, measurement, statistics, and put emphasis on activity such as real life experience, play, manipulation of concrete objects, and communication. However, there are some kinds of differences between them, because the kindergarten curriculum is not included in the common curriculum, from 1st grade to 10th grade. Thus, this study recommended several ideas based. Thus, this study recommended several ideas based on theories to connect the mathematics curricula of kindergarten and elementary school.

• 대한전자공학회논문지
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• 제25권2호
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• pp.204-210
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• 1988

The residue number system offers the possibility of high-speed operation and error detection/correction because of the separability of arithmetic operations on each digit. A compact residue arithmetic module named the self-checking pulse-train residue arithmetic circuit is effectively employed as the basic module, and an efficient error detection/correction algorithm in which error detection is performed in each basic module and error correction is performed based on the parallelism of residue arithmetic is also employed. In this case, the error correcting circuit is imposed in series to non-redundant system. This design method has an advantage of compact hardware. Following the proposed method, a 2nd-order recursive fault-tolerant digital filter is practically implemented, and its fault-tolerant ability is proved by noise injection testing.

• Nuclear Engineering and Technology
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• 제48권1호
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• pp.114-128
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• 2016

The development of operational performance indicators is of utmost importance for nuclear power plants, since they measure, track, and trend plant operation. Leading indicators are ideal for reducing the likelihood of consequential events. This paper describes the operational data analysis of the information contained in the Corrective Action Program. The methodology considers human error and organizational factors because of their large contribution to consequential events. The results include a tool developed from the data to be used for the identification, prediction, and reduction of the likelihood of significant consequential events. This tool is based on the resilience curve that was built from the plant's operational data. The stress is described by the number of unresolved condition reports. The strain is represented by the number of preventive maintenance tasks and other periodic work activities (i.e., baseline activities), as well as, closing open corrective actions assigned to different departments to resolve the condition reports (i.e., corrective action workload). Beyond the identified resilience threshold, the stress exceeds the station's ability to operate successfully and there is an increased likelihood that a consequential event will occur. A performance indicator is proposed to reduce the likelihood of consequential events at nuclear power plants.

• Journal of Power Electronics
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• 제10권2호
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• pp.155-164
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• 2010

This paper presents a voltage control algorithm for a hybrid multilevel inverter based on a staged-perception of the inverter voltage vector diagram. The algorithm is applied to control a three-stage eighteen-level hybrid inverter, which has been designed with a maximum number of symmetrical levels. The inverter has a two-level main stage built using a conventional six-switch inverter and medium- and low- voltage three-level stages constructed using cascaded H-bridge cells. The distinctive feature of the proposed algorithm is its ability to avoid the undesirable high switching frequency for high- and medium- voltage stages despite the fact that the inverter's dc sources voltages are selected to maximize the number of levels by state redundancy elimination. The high- and medium- voltage stages switching algorithms have been developed to assure fundamental switching frequency operation of the high voltage stage and not more than few times this frequency for the medium voltage stage. The low voltage stage is controlled using a SVPWM to achieve the reference voltage vector exactly and to set the order of the dominant harmonics. The inverter has been constructed and the control algorithm has been implemented. Test results show that the proposed algorithm achieves the desired features and all of the major hypotheses have been verified.

• 한국항만학회지
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• 제13권2호
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• pp.245-254
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• 1999

This paper aims to derive the strategies for the container terminal in Pusan. So it has focused on analyzing the current conditions of Pusan container terminal while evaluating the difficulties arising from the existing facilities/equipment and the operating system in the Pusan Korea Container Terminal through the workers at the container terminal and at off-dock CY. The object of this study is to assist the existing terminals to operate the facilities/equipment reasonably and to contribute shaping the ports policy which will be the basis of constructing new ports that will remain competitive while maintaining superiority over the ports in northeast area. According to the analysis 68% of the supplier answered that their terminal services which are the most important factor in running a terminal were superior to the other while only 28% of the user answered that they thought the current services were superior. For the areas of supplementing the terminal the people working at the terminal answered in the order of business operation equipment the number of berth service and management ability while the user answered in the order of service computer system transportation system and equipment. According to the regression analysis it became clear that there should be more effort toward improving or supplementing the facility scale facility usage charge transportation facilities which will assist in developing competitiveness of the terminal. It was also noted that management ability and business ability were mentioned as the important factors in operating a terminal.

• 한국철도학회논문집
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• 제19권2호
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• pp.234-242
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• 2016

기존 도시철도의 급행화 방안으로 가감속도가 향상된 고성능 열차를 완행에 투입하고 기존 성능의 열차를 급행에 투입하는 방안은 대피선 수를 줄이는 효과를 가진다. 본 연구에서는 고성능 열차를 완행으로 투입하는 급행화 방안을 토대로, 대피선 수를 최소화하면서 완행 열차의 운행시간을 최소화 할 수 있는 동시 최적화 방안을 제안하였다. 최적화 방안은 유전알고리즘을 기반으로 하여 차두시간, 대피선 위치 및 대피 시간을 설계 변수로 정의하였다. 결과적으로 제안한 최적화 방법론을 서울 7호선에 적용하여 타당한 최적화 결과를 얻을 수 있음을 확인하였다.

• 한국비블리아학회지
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• 제30권3호
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• pp.291-314
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• 2019

본 연구는 병원 내 도서관 이용자의 만족도를 제고시키고 향후 병원 내 도서관의 활성화 방안을 고찰하기 위해, 이용자와 비이용자를 대상으로 장서, 시설 및 환경, 직원, 서비스, 프로그램 등의 만족도 및 수요도를 조사하여, 이용자가 만족하는 도서관의 운영 방안을 모색하고자 하였다. 그 결과, 병원 내 도서관 활성화 방안으로 첫째, 최신성을 갖춘 다양한 주제의 장서 수 확대가 필요하다. 둘째, 병원 내 도서관의 직원 수확대가 시급하며, 이와 함께 의학 전문 지식 기반 의사소통 능력 향상 및 이용자 요구에 대한 신속한 대응 능력이 필요하다. 셋째, 시설 및 환경으로 병원 내 도서관 규모 확대와 편의시설 확대가 필요하다. 넷째, 서비스 질 향상과 다양한 서비스 제공이 필요하며, 이용자 대상에 따라 전문가는 주제검색서비스, 의학관련 정보원 제공 서비스를, 일반인(환자 및 보호자 등) 건강정보서비스 등을 제공해야 한다. 마지막으로 프로그램 운영을 위한 인프라 확대와 대상의 다양화, 프로그램 지속성 등이 확보되어야 한다.

• 산업경영시스템학회지
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• 제39권3호
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• pp.71-82
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• 2016

The ISO (International Organization for Standardization) 9000 QMS (Quality Management System) standards specify requirements that need to demonstrate an organization's ability to consistently provide products or services. Korean companies have been implementing ISO 9000 QMS to compete in global markets. ISO 9000 QMS standards have been revised in 1994, 2000, 2008, and 2015 since the first release in 1987. The key change in ISO 9001:2015 is focused on risk-based thinking. It means that risk inherent within an organization is early identified and proactively controlled by use of all aspects of QMS rather than taking preventive actions. In this article we did literature review mainly on empirical study related to motivation and operation performance of ISO 9000 implementation. We present the necessity of changeover, features of new version, and comparison between new and old version. In order to see how well organizations can implement the new ISO 9001:2015 we focus on manufacturing companies that are going to convert to ISO 9001:2015 registration. We collect their key characteristics such as yearly sales, the number of MPI (Management Performance Indicators), the number of KPI (Key Performance Indicators), the number of quality control engineers, quality control engineer work experience, and the degree of adaptiveness between new ISO 9001:2015 QMS and QMS currently operating in manufacturing companies. Especially the degree of adaptiveness is analyzed by correlation analysis, regression analysis, ANOVA, and t-tests to discover the relationships among their characteristics. We found out that the degree of adaptiveness is linearly related to quality control engineer work experience and the number of MPI and KPI that is practically utilized in manufacturing companies. We summarize the implications discovered to help manufacturing industry convert to ISO 9001:2015 registration.

• 한국산림과학회지
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• 제104권4호
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• pp.607-614
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• 2015

목재 생산 및 공급의 활성화를 위한 목재생산작업에서의 현황 및 문제점과 임업기계화사업의 현황 및 효과 등에 대한 설문조사를 실시하였다. 국산목재 생산 및 공급 활성화를 위해서는 임업기계화 사업의 추진, 정책 및 제도 개선, 임도망 확충, 작업원 양성, 목재생산 및 공급체계 개선, 임업기계 보급, 삼림작업시스템 구축, 교육 훈련 등이 필요하였다. 또한, 목재생산 및 공급의 활성화를 위한 정책은 정책목표의 재구축, 정책의 일관성, 법률 및 제도 정비 등이 더욱 필요하였다. 임업기계화 사업의 성과 및 효과를 높이기 위해서는 임업기계화 정책이 더욱 추진되고, 임업기계 장비의 보급과 더불어 교육 및 훈련과 강사능력 배양, 교재개발, 현장 기술지도 등이 시급한 정책이었다. 목재수요자의 선호도를 높이기 위해서는 전목집재를 통해 장재를 생산 공급하고, 국산재 이용도를 높이기 위해서는 낮은 가격과 생산목재의 길이와 직경 등에서 우량재의 생산 공급이 필요하였다.