• Journal of Elementary Mathematics Education in Korea
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• v.15 no.1
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• pp.199-219
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• 2011

In this thesis, we designed a experimental learning-teaching plan of 'decimal fraction concept' at the 4-th grade level. We rest our plan on two basic premises. One is the fact that a essential concept of decimal fraction is 'polynomial of which indeterminate is 10', and another is the fact that the origin of decimal fraction is successive measurement activities which improving accuracy through decimal partition of measuring unit. The main features of our experimental learning-teaching plan is as follows. Firstly, students can experience a operation which generate decimal unit system through decimal partitioning of measuring unit. Secondly, the decimal fraction expansion will be initially introduced and the complete representation of decimal fraction according to positional notation will follow. Thirdly, such various interpretations of decimal fraction as 3.751m, 3m+7dm+5cm+1mm, $(3+\frac{7}{10}+\frac{5}{100}+\frac{1}{1000})m$ and $\frac{3751}{1000}m$ will be handled. Fourthly, decimal fraction will not be introduced with 'unit decimal fraction' such as 0.1, 0.01, 0.001, ${\cdots}$ but with 'natural number+decimal fraction' such as 2.345. Fifthly, we arranged a numeration activity ruled by random unit system previous to formal representation ruled by decimal positional notation. A experimental learning-teaching plan which presented in this thesis must be examined through teaching experiment. It is necessary to successive research for this task.

• Journal of Biomedical Engineering Research
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• v.25 no.5
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• pp.329-334
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• 2004

The electronic nose (E-nose) recently finds its applications in medical diagnosis, specifically on detection of diabetes, pulmonary or gastrointestinal problem, or infections by examining odors in the breath or tissues with its odor characterizing ability. The odor recognition performance of E-nose can be improved by manipulating the sensor array responses of vapors in time-profile forms. The different chemical interactions between the sensor materials and the volatile organic compounds (VOC's) leave unique marks in the signal profiles giving more information than collection of the conventional piecemal features, i.e., maximum sensitivity, signal slopes, rising time. In this study, to use them in vapor recognition task conveniently, a novel time-profile method was proposed, which is adopted from digital image pattern matching. The degrees of matching between 8 different vapors were evaluated by using the proposed method. The test vapors are measured by the silicon-based gas sensor array with 16 CB-polymer composites installed in membrane structure. The results by the proposed method showed clear discrimination of vapor species than by the conventional method.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06c
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• pp.265-267
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• 2006

사용목적(Purpose)은 최근 개인 프라이버시 보호와 관련하여 데이타 수집과 수집 후 보안관리에 있어서 중요한 요소로 사용되고 있다. W3C(World Wide Web Consortium)는 데이타 제공자가 자신이 방문한 웹 사이트에 개인정보를 제공하는 것을 통제할 수 있도록 하는 표준을 제시하였다. 그러나 데이타 수집 후 유통과정에서 개인정보에 대한 보안관리에 대한 언급이 없다. 현재 히포크라테스 데이타베이스(Hippocratic Databases), 사용목적기반 접근제어(Purpose Based Access Control)등은 W3C의 데이타 수집 메커니즘을 따르고 있으며, 데이타 수집 후 보안관리에 대하여 사용목적 관리와 접근제어 기법을 사용하여 관리를 하고 있으나 사용목적에 대한 표현과 사용목적 관리의 미흡함으로 인하여 그에 따르는 개인정보의 프라이버시 보호에 있어서 효과적인 해결책을 제시하지 못하고 있다. 본 논문은 사용목적의 표현력을 향상시키면서. 사용목적의 효과적인 관리기법을 제시한다. 또한 개인의 프라이버시 보호를 위한 방법으로 사용목적의 분류화를 통해 최소권한의 원칙을 따르는 접근제어 기법을 제시한다. 본 논문에서는 사용목적을 상속적, 시간적 그리고 독립적 구조로 분류화하였으며, 이렇게 분류화된 사용목적에 대한 각기 다른 관리기법을 제시한다. 또한 접근제어의 유연성을 위해 RBAC의 역할계층 구조를 사용하였으며, 일의 최소 단위인 태스크(task)의 최소권한을 얻기 위한 조건으로 몇몇 특성의 사용목적을 사용하여 만족할 경우 태스크를 처리하기 위한 기존 모델보다 향상된 최소사용권한을 제공하는 기법을 제시한다. Interference Contrast)에 의한 내부구조 관찰이 최종 동정기준이 되어야할 것으로 나타났다.cillus로 구성되었다. 한편, DAL세균군(42균주)은 high G+C 및 low G+C gram positive 계통군 이외에도 proteobacteria -subdivision에 속하는 Afipia와 Ralstonia, proteobacteria -subdivision에 속하는 Variovorax, proteobacteria $\beta$-subdivision에 속하는Pseudomonas로 구성되어 계통학적으로 다양한 세균임이 확인되었다. 40%까지 대체가 가능하였으며, 아울러 높은 라이신 부산물의 대체 수준에 있어서 사료효율과 단백질 전환효율을 고려한다면 아미노산 첨가(라이신과 아르지닌)와 중화 효과에 좋은 결과가 있을 것으로 사료된다.의한 적정 양성수용밀도는 각고 5~6cm 크기의 경우 10~15개체가 적합하였다. 수증별 성장은 15~20 m 수층에서 빨랐으며, 성장촉진과 폐사를 줄이기 위해서는 고수온이 지속되는 7~10월에는 20~30m수층으로 채롱을 내려 양성하고 그 외 시기에는 15 m층 내외가 좋은 것으로 나타났다. 상품으로 출하 가능한 크기 인 각고 10 cm이상, 전중량 140 g 내외로 성장시 키기까지는 채묘후 22개월이 소요되었고, 출하시기는 전중량 증가가 최대에 이르는 3월에서 4월 중순이 경제적일 것으로 판단된다.er 90 % of good relative dynamic modulus of elasticity due to fineness of formation caused by the

• Journal of Gifted/Talented Education
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• v.22 no.3
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• pp.551-573
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• 2012

Educating gifted students in invention is a totally new area for researchers as well as educators. Establishing the theoretical concept of the gifted in invention has been a challenging task to many education researchers in Korea for last several years. This study was conducted to understand characteristics of the gifted in invention with the eventual purpose to conceptualize 'giftedness in invention.' The Future Mind by Gardner was adopted as the frame for categorizing the characteristics of the gifted in invention. Based on Five Minds, this study listed 25 factors with their 80 characteristics after intensive literature review and field surveys. The findings of this study are expected to contribute to establishing the theoretical base of educating the gifted in invention, to identifying gifted youngsters to be great inventors, and to designing the educational programs for them.

• The Journal of the Korea Contents Association
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• v.11 no.5
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• pp.369-383
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• 2011

The purpose of this study was to investigate the determinants of intent to leave among IT industry employees, based on the Price's structural model of employee turnover. The sample used in this study were composed of 370 employees from 10 IT firms located in Seoul and Gyeonggi-Do. Data were collected with self-administered questionnaires and analyzed using structural equation modelling technique. This study found that four task reward variables(job variety, job autonomy, job challenge, and role ambiguity), two social reward variables (supervisory support and coworker support), three organizational reward variables(promotional chances, job security, and distributive justice) and one environmental variable(job opportunity), had significant effects on IT industry employees' intent to leave in terms of total effects and his directions of those significant effects were consistent with theoretical predictions; and that two mediating variables, job satisfaction and organizational commitment had the most important effects on IT industry employees' intent to leave in terms of total effects. The theoretical and practical implications of the research findings were discussed and the directions for future research were suggested.

• Journal of Construction Engineering and Project Management
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• v.5 no.2
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• pp.11-15
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• 2015

The Last PlannerSystem (LPS) has been implemented on construction projects to increase work flow reliability, a precondition for project performance againstproductivity and progress targets. The LPS encompasses four tiers of planning processes:master scheduling, phase scheduling, lookahead planning, and commitment / weeklywork planning. This research highlights deficiencies in the current implementation of LPS including poor lookahead planning which results in poor linkage between weeklywork plans and the master schedule. This poor linkage undetermines the ability of theweekly work planning process to select for execution tasks that are critical to projectsuccess. As a result, percent plan complete (PPC) becomes a weak indicator of project progress. The purpose of this research is to improve lookahead planning (the bridgebetween weekly work planning and master scheduling), improve PPC, and improve theselection of tasks that are critical to project success by increasing the link betweenShould, Can, Will, and Did (components of the LPS), thereby rendering PPC a betterindicator of project progress. The research employs the case study research method to describe deficiencies inthe current implementation of the LPS and suggest guidelines for a better application ofLPS in general and lookahead planning in particular. It then introduces an analyticalsimulation model to analyze the lookahead planning process. This is done by examining the impact on PPC of increasing two lookahead planning performance metrics: tasksanticipated (TA) and tasks made ready (TMR). Finally, the research investigates theimportance of the lookahead planning functions: identification and removal ofconstraints, task breakdown, and operations design.The research findings confirm the positive impact of improving lookaheadplanning (i.e., TA and TMR) on PPC. It also recognizes the need to perform lookaheadplanning differently for three types of work involving different levels of uncertainty:stable work, medium uncertainty work, and highly emergent work.The research confirms the LPS rules for practice and specifically the need to planin greater detail as time gets closer to performing the work. It highlights the role of LPSas a production system that incorporates deliberate planning (predetermined andoptimized) and situated planning (flexible and adaptive). Finally, the research presents recommendations for production planningimprovements in three areas: process related, (suggesting guidelines for practice),technical, (highlighting issues with current software programs and advocating theinclusion of collaborative planning capability), and organizational improvements(suggesting transitional steps when applying the LPS).

• Journal of the Society of Naval Architects of Korea
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• v.53 no.5
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• pp.362-370
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• 2016

The weight estimation and calculation of FPSO topsides is first performed at the bidding stage of projects. At this time, it is difficult to estimate and calculate accurately the weight because most of items of FPSO are not apparently defined. Especially, in the case of the pipe rack module, its portion of the total weight and the range of weight variation are large due to special features of piping and electric equipment in the module. Thus, it is very important to estimate and calculate accurately its weight in the task of the weight estimation and calculation of FPSO topsides. In this study, the past data for the weight of the pipe rack module were collected and analyzed, the WBS (Work Breakdown Structure) for the pipe rack module was constructed, and primary variables and secondary variables for developing a weight estimation and calculation model were selected. That is, after analyzing the past data, the volume was selected as the primary variable and the regression analysis was performed based on the variable. Then, several secondary variables were selected and incorporated into a weight estimation and calculation model. At this time, the weight per discipline was assumed from ratios of the total weight. Finally, the weight of the pipe rack module was estimated and calculated by using the developed model. As a result, the deviation from the model was better than that (-20 % ~ 60 %) of other studies about the weight estimation and calculation of FPSO topsides. Thus, the validity and applicability of the weight estimation and calculation of the pipe rack could be checked.

• Journal of Gifted/Talented Education
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• v.19 no.3
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• pp.729-758
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• 2009

The domestic Gifted education is evaluated to attain many achievements and to reach stable circle in short term. What about the present situation of artistic talent education which is one of the talent education areas, especially music talent education? The result of domestic Gifted education can be comprehensively understood by actually searching the present situation of diverse Gifted education areas. In this sense, this research aims to search the overall situation of domestic music talent education and to draw the tasks to be improved later mainly on the basis of important matters for efficient operation of music talent education. Thus far, many researches have been made mainly through quantitative statistical data or survey materials in the form of questionnaire. Meanwhile, this research tries to deeply understand the problems that have been superficially managed so far by collecting the voice of diverse practical staffs related to music talent education for comprehensive analysis and investigation. This research is meaningful in that it establishes the direction of more effective music talent education in the future by lessening the gap between policy and reality, intent and result, etc through diverse comprehension of actual situation and position related to music talent education and provides the basic materials based on reality to cultivate teacher and administrator and to develop curriculum.

• The Journal of the Korea Contents Association
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• v.14 no.9
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• pp.567-581
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• 2014

Recently, with the introduction of social network services, studies that try to make use of them for the various purposes have been actively developed. In order to proceed with the research that takes advantage of social network services, it is necessary to review the relevant literature and to identify trends in researches. However, the researches of social network service since 2007 are massive amount, so to review the huge amount of relevant research literature is a very difficult task. Therefore, in this study, we analyze systematically the tendency of research related to social network service focusing on Twitter. Especially, we use the SLR(Systematic Literature Review) technique for systematic literature survey and analysis. For the literature survey, we select five well-known literature resource sites and 128 studies of literature that are surveyed. In order to identify various research trends, we conduct the survey with two research groups: researches since 2007 and researches since 2011. As a result of the investigation, since 2007, the researches associated with "Application", "User Activity" and "User Content Analysis" main study topics have been mostly carried out. In addition to the result, the trend of secondary study topics in a main study topic, trends in research based on the number of citations and the scale of the experimental data and characteristics of the author are analyzed from a variety of perspectives.

• The Journal of the Korea Contents Association
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• v.16 no.12
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• pp.383-398
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• 2016

The objective of this research is to depict examples of how a company could derive the skillset areas with the highest priority when analyzing the skill set requirements of human resources, based on the skillset requirements that are unique to each work site. For this purpose, a survey was conducted for each of the job categories for new employee in A company. The analysis results showed that in 32 out of the 34 areas, the gaps between the current levels and the expected levels were statistically significant. For employees of company A, the following 7 areas were determined to be the key job competencies with the highest priority: document creation skills, diagram creation skills, thinking skills, problem solving skills, time management skills, technology comprehension ability, and task comprehension skills. The required job competencies with the highest priority were found to be different for each job category. As a result of this research, the priority rankings of skillset requirements for each job category in company A could be determined, along with the implications for HRD/HRM and other companies.