• 한국지구과학회지
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• 제41권4호
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• pp.415-434
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• 2020

The purpose of this study was to explore if, what kinds of, how much computational thinking (CT after this) practices could be included in STEAM programs, and what kinds of CT practices could be improved to make STEAM revitalized. The CT analyzing tool with operational definitions and its examples in science education was modified and employed for 5 science-focused and 5 engineering-focused STEAM programs. There was no discerning pattern of CT practices uses between science and engineering STEAM programs but CT practices were displayed depending on their topics. The patterns of CT practices uses from each STEAM program could be used to describe what CT practices were more explored, weakly exposed, or missing. On the basis of these prescription of CT practices from each STEAM program, the researchers could develop the weakly exposed or missing CT practices to be improved for the rich experience in CT practices during STEAM programs.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.658-668
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• 2009

Earth-moving operation has a great impact on the overall budget and schedule of any heavy civil projects. More often than not, the operational decisions are made largely based on field personnel's experience and judgment. In particular, decisions on earth moving operations by scraper-dozer fleets have been heavily influenced by the following belief: "The longer a dozer pushes a scraper for loading, the better earth-moving productivity is gained by the fleet." Even though there is some truth to this notion, scraper-dozer earth moving operations involve a much complex process that requires a systematic analysis for predicting the maximum production. To this end, this paper presents a spreadsheet-based scraper-dozer fleet operation model for its production optimization. Various optimization techniques, including a genetic-algorithm method, are presented for comparison and each technique's pros and cons are discussed.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.578-582
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• 2015

Lack of client involvement in construction of public projects has been identified as the main cause of many operational problems. Clients need to perform their roles and responsibilities effectively and efficiently at the right time and through the use of correct methods in order to have the optimum involvement required during all the construction project phases, namely, the planning, design, construction, handover, and operation and maintenance phase. This paper investigates the influence of clients' individual factors on their involvement in construction project delivery. A questionnaire survey was distributed to various government agencies of the Kingdom of Saudi Arabia (KSA). Explanatory Factory Analysis was performed to group nineteen individual factors. The factor analysis result suggests that the individual factors that can involve clients' involvement in construction projects can be grouped into five, which are: adequacy of knowledge and experience for decision making in the early stage of design; ability to communicate clearly; job satisfaction; personal skills; and expertise in design and construction.

• Asia pacific journal of information systems
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• 제32권2호
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• pp.191-225
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• 2022

Based on its technological elements (distribution, encryption, immutability, tokenisation, decentralisation, and smart contracts), blockchain has drawn considerable attention in various industries and verticals. Still, the strategic adoption of blockchain is in its early stages because of the current barriers and challenges in the areas of 'customer experience', 'business models', and 'operational processes.' This work delivers a comprehensive synopsis of the fundamental challenges faced by blockchain adopters in their digital journey, based on a literature survey. The authors leveraged MAXQDA software and the theory, context, characteristics, and methodology (TCCM) framework to develop themes, findings, and evidence for adoption barriers. The research evaluates the literature on blockchain adoption challenges and offers research insights and managerial agendas for future inferences.

• 수산해양교육연구
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• 제14권2호
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• pp.149-160
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• 2002

1992~2001년에 걸쳐 10년간 해양사고를 분석한 결과는 다음과 같다. 1. 용도별 사고 발생 빈도는 어선 69.9%, 화물선 12.3%, 유조선 4.3%, 예인선 3.8%, 여객선 2.1%이였다. 2. 원인별 사고 발생 빈도는 운항상 과실 67.3%, 기관설비 취급불량 21.7%, 기상 등 기타 11%로서 주로 운항자의 자질미숙과 과실로 언한 사고가 많았다. 3. 유형별 사고 발생 빈도는 기관 및 선체 손상 27.5%, 충돌 24%, 침몰 11.3%, 화재 7.9%, 좌초 10%의 나타났다. 4. 해역별 사고 발생 빈도는 연안 및 항내 74.6%, 근해 및 원양 25.4%를 보였고, 톤급별 사고 발생은 500톤 미만 소형선에서 84.3%를 보였고, 시각별 사고 발생은 04~08시에 가장 많았다.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제23권1호
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• pp.45-61
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• 2020

초등학교 수학에서는 '같음'을 명시적으로 다루지 않고 등호를 읽는 방법으로 제시한다. 등호의 의미는 크게 연산적인 관점과 관계적인 관점으로 구분된다. 그러나 대부분의 초등학교 학생들은 등호를 연산의 결과로 구한 답을 적으라는 연산적인 의미로 이해한다. 중학교 수학에서 요구되는 대수적 사고를 하기 위해서는 등호의 관계적인 의미에 대한 이해가 바탕이 되어야 한다. 최근에는 초등학교 수학에서 다루는 산술에서부터 등호의 관계적인 의미를 강조한다. 따라서 초등학교 수학에서 학생들이 등호의 관계적인 의미를 경험할 수 있는 활동을 의도적으로 제시할 필요가 있다. 본 연구에서는 초등학교 수학에서 사용되는 같음과 등호의 의미와 등호가 사용된 맥락을 분석하고, 이를 바탕으로 같음과 등호의 관계적인 의미를 강조할 수 있는 방안을 논의하고자 한다.

• 수산해양교육연구
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• 제27권6호
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• pp.1523-1531
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• 2015

Small boat operator's certificate of competency took up 39.0% of total license holders and required for at least 19,000 boats in 2013, was proposed the improvement items by reviewing the acts and criteria related to the current test and analyzed the questions of set at examinations. About 31% of questions of the current written test are unsuitable for the target boat and operational knowledge of the operator. It is appropriate that the subject categorization criteria and contents of the subjects will be improved to include practical details related to safe ship operation, and the number of questions increased according to each subject category in amended examination after January 1st, 2017. The interview test should be improved so that the questions can be forwarded in a clear manner through formulation of practical problems, photos, etc. considering the real situations such as high age/low education status of testee and it is necessary to lengthen the interview time per testee. The test and interview personnel should consist of a human resource pool with experience in small boat operator training and workers of related areas familiar with field terminology. Furthermore, the test should be divided into small boats of 2 to 5 tons and those exceeding 5 tons according to the tonnage of small boats.

• 한국식품조리과학회지
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• 제26권1호
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• pp.41-53
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• 2010

The purposes of this study were to: a) investigate personal and foodservice operational factors affecting job stress of school foodservice dietitians, b) analyze the contribution of emotional labor to job stress of school foodservice dietitians. A survey was conducted from May 2 to June 13, 2008 to collect data from school foodservice dietitians (N=546). 206 questionnaires were returned completed, and 15 improperly-completed questionnaires were excluded. Finally, 191 questionnaires were used for final statistical analysis (usage rate : 34.98%). The results of the study were as follows. First, personal variables significantly affecting dietitians' job stress were 'monthly bills(p<0.05)' and 'total length of time in school foodservice (p<0.05)'. Second, foodservice operational variables affecting dietitians' job stress were 'school level (p<0.05)', 'type of school foodservice management (p<0.01)', 'number of meal service times (p<0.05)', 'total number of meals served per day (p<0.001)', 'number of meals served per day for students (p<.001)', 'number of meals served per day for teachers (p<0.001)', and 'number of foodservice staff (p<0.001)'. Third, emotional labor was found to contribute significantly to the job stress of dietitians in school foodservice (p<0.001). It was found that as dietitians experience more emotional labor at work, more job stress is experienced. Stress management is a very important and meaningful contributor to foodservice quality as well as to personal well-being for workers in school foodservice. Therefore, it is proposed that management of emotional labor is essential for stress management. Further, emotional labor and job stress should no longer be considered a personal matter, but rather should be approached systematically in all aspects of a school foodservice organization.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권7호
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• pp.2389-2413
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• 2015

High data rates in long-term evolution (LTE) networks can affect the mobility of networks and their performance. The speed and motion of user equipment (UE) can compromise seamless connectivity. However, a proper handover (HO) decision can maintain quality of service (QoS) and increase system throughput. While this may lead to an increase in complexity and operational costs, self-optimization can enhance network performance by improving resource utilization and user experience and by reducing operational and capital expenditure. In this study, we propose the self-optimization of HO parameters based on fuzzy logic control (FLC) and multiple preparation (MP), which we name FuzAMP. Fuzzy logic control can be used to control self-optimized HO parameters, such as the HO margin and time-to-trigger (TTT) based on multiple criteria, viz HO ping pong (HOPP), HO failure (HOF) and UE speeds. A MP approach is adopted to overcome the hard HO (HHO) drawbacks, such as the large delay and unreliable procedures caused by the break-before-make process. The results of this study show that the proposed method significantly reduces HOF, HOPP, and packet loss ratio (PLR) at various UE speeds compared to the HHO and the enhanced weighted performance HO parameter optimization (EWPHPO) algorithms.

• 대한지역사회영양학회지
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• 제11권5호
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• pp.629-641
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• 2006

The objectives of this study were to: (a) examine the overall operating conditions of both government-dominant and non-governmental food bank programs, (b) understand the operational management attributes on the target based on IPA (importance performance analysis) (c) analyze the present status of donating management, and (d) suggest a direction based on the analysis of advantages and disadvantages of food banks in each part. The random samples of 120 food bank operators were selected by a proportionate stratified random sampling method. A total of 60 government-dominant food banks and 25 non-governmental food banks were analyzed. The main results of this study were as follows: Accord-ing to the Importance-Performance Analysis of operational management, 'assistance for operating funds' and 'deployment of experience staff' were placed at 'Focus Here'. There was a great shortage of experienced staff with food bank-specific knowledge. The average number of the government-dominant and non-governmental food bank program employees was 0.29 and 0.30 respectively, while the ratios of employees with other jobs were 0.96 and 0.83 respectively. Shortages of refrigeration facilities were an area that needs to be addressed. While 51.6% of donated food required cold storage, only 45% of government-dominant and 60% of non-governmental food bank programs had refrigeration facilities. Most of food bank operators (96.3%) were required to visit the donators' locations to pick up the donated foods. And the foods were distributed to the people in need, especially to the livelihood protectee.