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Ex Ante Evaluation Methodology for IT Investment Decision Making: Integrating the Current Best Practice Methods and Applications (정보화 투자 사전평가방법론: Best practice 평가기법 및 적용사례의 통합)

  • Lee, Kuk-Hie;Park, So-Hyun
    • Information Systems Review
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    • v.10 no.1
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    • pp.135-164
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    • 2008
  • This research is to offer a structured yet practical ex-ante evaluation methodology for IT investment. Benchmarking the best practices of four Korean organizations, we try to integrate core processes, relevant measures, and evaluation dimensions into a consistent and wholesome body of evaluating methodology. The best practices we considered encompass a wide range of business enterprises, including for-profit, non-profit, service-oriented, and manufacturing entities. The proposed methodology consists of three stages; the first stage checks the validity of investments by looking into comprehensiveness of planning, willingness to accomplish, justifiable grounds for the investments, overlapping investments, and obstructing risks; the second do so by putting an IT investment into economic, strategic, and technological perspectives; and the last third would produce a unified quantity that summarizes outcome of the previous stages. Incorporating the proven knowledge, guidelines, and quantifying tools, the methodology could make a valuable reference model for IT evaluation practitioners who have been bedeviled by having to going through such ex-ante evaluations.

Measurement of $\textrm{CO}_2$ Concentration and Leaf Area Index for Crop Photosynthesis Model in Sweet Pepper (단고추의 작물 광합성 모델을 위한 $\textrm{CO}_2$ 농도와 엽면적지 수 측정)

  • Lee, Beom-Seon;Chung, Soon-Ju;Jang, Hong-Gi
    • Journal of Bio-Environment Control
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    • v.8 no.3
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    • pp.192-201
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    • 1999
  • This study was aimed to introduce the measurement of $CO_2$ concentration and leaf area index in the phytotron for predicting the effect of CO.E, light and leaf area index on the instantaneous photosynthetic rate of sweet pepper with the existing ASKAM model. Measurements were made in 2 semi-closed phytotron compartments in which three different $CO_2$ concentrations were applied at random. Plants were grown on containers with circulating nutrient solution at 21$^{\circ}C$ and 80-95% relative humidity. The model estimates crop net $CO_2$ uptake for short time intervals during the day based on short-term data of daily radiation, temperature and $CO_2$ concentration. During the photosynthesis measurements, $CO_2$ concentrations in both compartments and in the basement were measured every minute. This was also done for the flow of pure $CO_2$ into the compartment, global radiation, photosynthetic active radiation inside the compartment, temperature and relative humidity. Crop growth models summarize our knowledge on crop behavior and have as such a wide range of applications in analysis, crop management and thus as a farm management tool.

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An Analysis of Students' Understanding of Mathematical Concepts and Proving - Focused on the concept of subspace in linear algebra - (대학생들의 증명 구성 방식과 개념 이해에 대한 분석 - 부분 공간에 대한 증명 과정을 중심으로 -)

  • Cho, Jiyoung;Kwon, Oh Nam
    • School Mathematics
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    • v.14 no.4
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    • pp.469-493
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    • 2012
  • The purpose of this study is find the relation between students' concept and types of proof construction. For this, four undergraduate students majored in mathematics education were evaluated to examine how they understand mathematical concepts and apply their concepts to their proving. Investigating students' proof with their concepts would be important to find implications for how students have to understand formal concepts to success in proving. The participants' proof productions were classified into syntactic proof productions and semantic proof productions. By comparing syntactic provers and semantic provers, we could reveal that the approaches to find idea for proof were different for two groups. The syntactic provers utilized procedural knowledges which had been accumulated from their proving experiences. On the other hand, the semantic provers made use of their concept images to understand why the given statements were true and to get a key idea for proof during this process. The distinctions of approaches to proving between two groups were related to students' concepts. Both two types of provers had accurate formal concepts. But the syntactic provers also knew how they applied formal concepts in proving. On the other hand, the semantic provers had concept images which contained the details and meaning of formal concept well. So they were able to use their concept images to get an idea of proving and to express their idea in formal mathematical language. This study leads us to two suggestions for helping students prove. First, undergraduate students should develop their concept images which contain meanings and details of formal concepts in order to produce a meaningful proof. Second, formal concepts with procedural knowledge could be essential to develop informal reasoning into mathematical proof.

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The Growth of School Mathematics: Korean Secondary Gifted Students' Collaborative Problem Solving Using The Wiki (학교수학적 지식의 성장: 고등학교 영재 학생들의 위키(Wiki) 기반 협력 문제해결 활동을 중심으로)

  • Lee, Seoung Woo
    • Journal of Educational Research in Mathematics
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    • v.25 no.4
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    • pp.717-754
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    • 2015
  • As a design research, this study aims to identify students' collaborative problems solving patterns using the Wiki and design factors triggering MKB(mathematical knowledge building) in virtual environment. For 70 days, 14 Korean secondary gifted students, who enrolled in calculus II courses in one of gifted institutions in Korea, solved 10 math problems together using the Wiki. In this study, I considered five design factors; motivation, practice of LaTeX, norms of participation, epistemic agency, and two types of educational settings. The primary pattern emergent in students' collaborative problem solving process is identified as 'solutions and refutations' along the double helix consisting of the constructive line and the critical line, which is very similar to the pattern of 'Conjectures and Refutations'(Lakatos, 1976). Despite that most participants had difficulty in using LaTeX for mathematical expressions, this study shows that Wikis are valuable tools for providing Korean secondary students opportunities to learn social virtue such as humility and courage (Lampert, 1990), which is considered to be have been neglected in Korean educational environment but is emphasized as precious for doing mathematics in the field of mathematics education.

Inductive Analysis Approach on Middle Grade Mathematics Pre-Service Teachers' Teaching Philosophies (중등 예비 수학 교사의 교육철학에 대한 귀납적 분석)

  • Han, Sunyoung
    • Journal of Educational Research in Mathematics
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    • v.25 no.4
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    • pp.599-615
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    • 2015
  • Teachers' philosophies have not been emphasized enough in the current teacher education curriculum even though teacher's philosophy palys a critical role in schools and classrooms. The examination on pre-service teachers' teaching philosophies is necessary to improve teacher education curriculum so that teaching philosophies are often discussed in the courses of 'pedagogical content knowledge' as well as 'general education.' Therefore, the current study investigated 44 pre-service teachers' teaching philosophies, their sub domains, and relationships among the sub domains. The previous studies regarding mathematics teacher's teaching philosophy were more about 'teacher's belief' and employed deductive inference approach using surveys or questionnaires. These studies commonly pointed out that there were three major domains of 'belief on mathematics itself,' 'belief on teaching mathematics,' and 'belief on learning mathematics.' As these three domains of teacher's philosophy has been strengthened, there were very few studies examining the other potential domains of teacher's teaching philosophy. According to the findings of the present study, which employed inductive inference approach and pre-service teachers' free essay writing assignment, 'belief on teacher's role in mathematics classroom,' 'belief on the purpose of mathematics education,' and 'motivation to be a mathematics teacher' were additionally illuminated as sub domains of teacher's teaching philosophy. Moreover, the interrelationship among the sub-areas of teacher's teaching philosophy was disclosed. Specifically, 'belief on the purpose of mathematics education' and 'motivation to be a mathematics teacher' influenced the other sub domains. This implies that the relationships among the sub domains of teacher's teaching philosophy were more likely to be causal and vertical relationships rather than independent and parallel relationships. Finally, the findings from the current study provide implications indicating how pre-service teachers' teaching philosophies might be established in mathematics education courses for future research and education.

The Food Habit and Stress Scores of High School Students in Seoul Area (서울지역 고등학생의 식습관과 스트레스에 관한 연구)

  • 한명주;조현아
    • Korean journal of food and cookery science
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    • v.16 no.1
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    • pp.84-90
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    • 2000
  • This study was to investigate the eating attitutes, food habits, perceived stress of high school students. Three hundred and fifty four high school students in Seoul area were surveyed to obtain the information from Sep. 18 to 26 in 1997. The average height and weight of high school students were 173.7 cm, 62.9 kg for male students and 162.5 cm, 52.6 kg for female students. The 52.5% of high school students were normal weight and 41.5% of them were underweight. Female students(46.7%) showed higher proportion of underweight than male students(37.0%). The students(50.9%) ate breakfast irregularly and most students(92.5%) ate Korean food for breakfast. The dietary changes of high school students over past few years showed that the intake of vegetable, fruit and yogurt were increased. The food habit score showed no significant difference by gender, mother's employment and monthly spending money. The nutritional knowledge score of female students were higher than the score of male students. Most high school students(93.9%) were highly stressed in their living. The stress score(3.35) of female students were higher than those of male students(3.15). However, excercise, eating slowly and good appetite could lower their perceived stress.

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Usage and Satisfaction of Food-related Smartphone Applications of Office Workers in Seoul Area (수도권 지역 직장인의 음식 관련 스마트폰 어플리케이션 이용 실태와 만족도)

  • Gil, Munkyung;Jeong, Heesun;Yoon, Jiyoung
    • The Korean Journal of Food And Nutrition
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    • v.27 no.6
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    • pp.1096-1106
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    • 2014
  • This study was conducted to figure the usage status and satisfaction of food-related smartphone applications by generic characteristics and food purchase attributes of Seoul area workers. The results show that health vitality-oriented group, married compared to single, those with higher eating-out expenses possess more food-related applications (p<0.05). The primary reason for the usage of food-related applications was the need for food-related information (53.7%). The highest application subjects in use were restaurant-related information and recipe information. The real-life aid food-related applications utilized most were also restaurant information (60.7%) and recipe information (28.3%). Health vitality-oriented respondents especially turned out to use nutrition information and food functionality information often (p<0.01), and recipes or calories & diet information usage frequency was higher in women than in men (p<0.001). Restaurant-related information were more frequently used by singles, highly educated, and those with high income and eating-out expenses (p<0.05). Satisfaction of food-related applications was normal (3.06), showing that the satisfactory level is not yet high. Satisfaction regarding purchase attributes showed that the health vitality-oriented group (3.19) was more satisfied compared to other groups (p<0.05), and women (3.16) were more satisfied that men (2.89) were (p<0.05). Inconveniences of food-related applications were highest in usage fee (3.29), simplicity of information (3.28), lack of reliability of information and need for update (3.10). The results of this study implies that various subdivisions of food-related applications users should be implemented; at the same time, food-related applications covering diverse subjects that regard each group's characteristics should be developed in order to utilize food-related knowledge and information as a marketing tool in the food industry; this can efficiently be done by paying attention to the quality of information and updates within applications.

Exploring the Problem and Solution in Curriculum Development of School-based Program for the Gifted in the Arts (단위학교 예술영재학급 교육과정 개발의 문제점 및 개선 방안 탐색)

  • Lee, Kyungjin;Kim, Sunghye;Kang, Byoungjik
    • Journal of Gifted/Talented Education
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    • v.25 no.2
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    • pp.299-320
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    • 2015
  • This study aimed to explore the problem in curriculum development in school-based gifted program in the arts and suggest the way to solve that. For this study, we surveyed 28 teachers and guest instructors, furthermore interviewed 6 teachers (4 in music and 2 visual arts). The study results indicated that not only curriculum development of school-based program for the gifted in the arts was not systemic, but also most teacher depended excessively on guest instructors due to the lack of expertise and information for curriculum development. Also, They did not understand specific meaning of the giftedness and gifted curriculum in arts nor recognize the unique role of school-based gifted program. In addition, most teachers simply attempted to solve lack of knowledge and experience on a personal level. Their research condition were inadequate to plan curriculum. To solve these problems in curriculum development in school-based gifted program in arts, we suggested some solutions: differentiated teacher in-service program, the achievement criteria for fundamentals of curriculum, system for connecting materials, information and human resources, as well as consultative body for improving the present condition of school-based gifted program.

The Construct Validation of the Scale for Screening the Qualified Teachers for the Gifted in Music (음악(국악)영재 담당교사 평가문항의 구인타당화)

  • Won, YoungSil
    • Journal of Gifted/Talented Education
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    • v.25 no.2
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    • pp.237-259
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    • 2015
  • Teachers in music(including Korean traditional music) gifted education are a significant variable in both identifying the giftedness of students and a successful instruction. The purpose of this study is to develop the Scale for Screening the Qualified Teachers for the Gifted in Korean traditional and western Music(SSQTGM), and to examine the validity and reliability of the SSQTGM. To achieve this purpose, this study administered the SSQTGM to 175 teachers of gifted students aged between 13 and 15 in middle schools for the arts. To validate the SSQTGM, I analyzed the criteria of the SSQTGM, and conducted an exploratory and confirmative factor analysis. I also examined an internal consistency. As a result of the exploratory factor analysis, I finally collected 41 items of the SSQTGM. Futhermore, I could identify psychological constructs of the qualified teachers for the gifted in Korean traditional and western music. In consequence of the confirmative factor analysis, the model provided a good fit to observe data. As a result of the reliability analysis, the internal consistency of knowledge in the music(korean traditional music) verified cronbach's ${\alpha}=.937$, and the expertise of the class management and instruction verified cronbach's ${\alpha}=.942$. Also, the teachers' aptitude and personality verified cronbach's ${\alpha}=.963$. This result of the construct validation reflects the fact that the SSQTGM is an available scale that can be applied in gifted education field instantly.

Expert Delphi Survey on Educational Goals and Subjects for Developing a Music Gifted Curriculum (음악영재교육과정 개발을 위한 전문가 델파이 조사: 교육목표 및 교과목을 중심으로)

  • Lee, Kyungjin;Choi, Jinyoung;Choi, Na-Young
    • Journal of Gifted/Talented Education
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    • v.24 no.5
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    • pp.807-827
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    • 2014
  • The purpose of this study was to extract and validate the educational goals and the subjects for developing a music gifted curriculum. Based on literature review and analysis of music gifted curricula in foreign countries, 19 educational goals and 18 subjects were derived from literature review and analysis of music gifted curricula in foreign countries. To validate the educational goals and the subjects, delphi survey was carried out twice with 26 expert panelists in the field of music, music education and music gifted education. Delphi survey was analyzed using the mean, content validity ratio, and the degree of consensus. The final set of educational goals for music gifted education included 6 skills related goals, 4 creative expression related goals, 4 knowledge related goals, and 2 attitude related goals. The final set of subjects included 4 major-specific subjects, 5 foundational subjects, 4 theory-related subjects, 3 integration and social participation related subjects. The results of this study can be used as baseline data to develop a music gifted curriculum by providing ideas for deciding what to teach and why to teach in music gifted education.