• Title/Summary/Keyword: Previous Studies

Search Result 12,216, Processing Time 0.032 seconds

Overview of Project on COP Increase of Refrigeration Cycle using nano-fluids (나노유체를 이용한 냉동사이클 효율 향상 과제의 소개)

  • Kim, Jeongbae;Lee, Kyu Sun;Lee, Geun An
    • Journal of Institute of Convergence Technology
    • /
    • v.1 no.2
    • /
    • pp.29-32
    • /
    • 2011
  • In this paper, we will introduce the overview of new project dealing how to increase of refrigeration cycle COP using nano-fluids, CuO, TiO2, Al2O3, that are used on similar previous studies. Recently many studies were performed to show the effect of nano-fluids at refrigeration cycle. But, the reason was not cleared yet. In general, the flow phenomena at the evaporator were guessed to be mixed with the partial pool boiling condition and the flow boiling condition from the previous results not published yet. So, we hope that the COP increase of refrigeration cycle will be verified and showed through this project.

  • PDF

A Review of Eye-tracking Method in Elementary Science Education Research (초등과학 교육연구에서 시선추적 연구방법의 고찰)

  • Shin, Won-Sub
    • Journal of Korean Elementary Science Education
    • /
    • v.35 no.3
    • /
    • pp.288-304
    • /
    • 2016
  • The purpose of this study is a review of previous studies and principles of eye-tracking techniques that are actively applied in recent elementary science education. Also it proposes to utilize the direction of eye tracking techniques in elementary science education research. Recent eye-tracking technology was developed, using the infrared pupil and the corneal reflection can be safely and accurately track the eye movements of the participants. Eye tracking has the advantage of higher temporal resolution, accessibility, convenience, objectivity, stability and safety. Analysis of the previous studies, there was a difference in the study design and analysis. The workshops and seminars are needed for accurate understanding of eye-tracking method in elementary science education research. In conclusion, the eye-tracking can be utilized such as effectiveness analysis of teaching materials and media, behaviors analysis of teachers and students in a real class, cognitive strategies and attention analysis of the student, discriminating tool of various education evaluation, etc.

Development of Evaluation Criteria for the Forest Garden

  • Hong, Kwang-pyo;Jin, Hye-young;LEE, Hyuk-jae
    • International Journal of Advanced Culture Technology
    • /
    • v.8 no.1
    • /
    • pp.113-119
    • /
    • 2020
  • Development of forest garden for city dwellers utilizing green space within urban area is nowadays highly regarded as a means to invigorate city and to raise living standard for city dwellers. Thus, development of forest garden has become pressing and important agenda for city governments. Promoting forest garden to solve many environmental and social issues city governments face today requires evaluation criteria to determine whether target green space is suitable to serve as forest garden. In this respect, we believe that evaluation of values of forest garden from previous studies can serve as foundation for developing evaluation index for forest garden. Thus, we aimed to develop evaluation criteria for values of forest garden. First, various evaluation criteria collected from previous studies were assessed by expert groups. Then, the result was studied through AHP technique and we developed evaluation criteria for forest garden based on such result. Especially, evaluation criteria were divided into main and sub-levels for more detailed and precise evaluation system.

A Study on Success Factors and Performance of New Products (신제품 혁신 성공요인과 성과에 관한 연구)

  • Lee, Seung-Hui;Kim, Jong-Ho;Kim, Yeong-Su;Kim, Hye-Gyeong
    • Journal of Digital Convergence
    • /
    • v.4 no.2
    • /
    • pp.27-39
    • /
    • 2006
  • This paper aimed to exam core factors of the success factors of new products and analyze their effects on success. To accomplish this purpose, this study examined previous studies and summarized core factors of success factors of new products. From previous studies, we drawed core factor. Core factor is technology factors(marketing skills, technical skills), specific of new product(more innovative, less innovative, cost advantage, competitive advantage), the process of product development(crossfunctional integration, staff involvement). Except for more innovative factors, the others factors affect on success. To be winner, companies must be consider these key factor(less innovative, cost advantage, competitive advantage, cross-functionalintegration, staff involvement).

  • PDF

Taxonomy of Apparel Buying Decision Approaches among Female College Students (의복구매의사 결정의 유형에 관한 연구 -상황적 특성과의 관계를 중심으로-)

  • 박은주
    • The Research Journal of the Costume Culture
    • /
    • v.6 no.4
    • /
    • pp.120-135
    • /
    • 1998
  • The purpose of this study were to develop the taxonomy of apparel buying decision approaches and to identify the relationships between the apparel buying decision approaches and the situational characteristics. Data were collected via a questionnaire developed on the previous studies and the focus interview from 425 female college students living at Pusan, and analyzed by Factor Analysis, Cluster Analysis, Analysis of Variance, and Discriminant Analysis. Results indicated that apparel buying decision approaches consisted of eight dimensions and situational characteristics of affecting a particular apparel buying decision approaches were composed of three or five factors. The four types of apparel buying decision approaches were derived by Cluster Analysis and ANOVA: Recreational Shoppers, Brand Conscious Shoppers, Quality Conscious Shoppers, and Apathetic Shoppers. The findings revealed some patterns that were similar to previous studies and was useful to marketing managers who can view their customer segments in terms of the types in the taxonomy. Further, it provided a tool by which sales representatives can develop adaptive selling approaches based on a small set of buying situation and corresponding apparel buying decision approaches.

  • PDF

Effectiveness of Death Education on the Reduction of Children's Death Anxiety (아동의 죽음불안 감소를 위한 죽음대비교육의 효과)

  • Nahm, Eun Young;Chang, Yeon Jip
    • Korean Journal of Child Studies
    • /
    • v.20 no.3
    • /
    • pp.217-230
    • /
    • 1999
  • This study examined children's death anxiety by religion, previous death experience and the effectiveness of a death education program. Half of the subjects 60 nine-year-old elementary school subjects were assigned to the experimental group and half were assigned to the control group. The 6-week death education program for the experimental group included literature, role play, and discussion. A questionnaire and death anxiety scale for children were administered to all subjects. After the educational program, there was a significant difference in death anxiety scores, between the experimental and control groups. However, children's religion and previous experience with death had no significant relationship to their death anxiety or effectiveness of the death education program.

  • PDF

The Study on Organizational Context Factors for Successful Strategic Information Systems Planning (성공적인 전략 정보시스템 계획수립을 위한 조직상황요인에 관한 연구)

  • Moon, Young-Eun;Lee, Jae-Beom;Cha, Chang-Ik
    • Asia pacific journal of information systems
    • /
    • v.7 no.2
    • /
    • pp.137-162
    • /
    • 1997
  • The recent fast change of information technology and business environments has led to increasing effort to achieve the business goals by using company resources effectively and efficiently Strategic Information Systems Planning is the first and significant step support the objectives. However, the present situation is that the SISP works are performed only by the methodological process of some chosen consulting house without a full considerations of organizational environment and system development characteristics. So, this study's purpose is to improve SISP works by observing the organizational environment factors through planning cases. This paper is composed of investigating the organizational characteristics and the additional problems from the analysis of three cases on the basis of 12 organization context factors founded by previous studies. And the conclusive part presents the organizational considerations according to each planning steps. This works will be used framework of SISP on the contrary previous studies only found organizational factors related to SISP works by questionary research methods. The more fundermental and multi-dimentioned researches is to be expected as more enterprises perform SISP works.

  • PDF

Phonetic characteristics of Korean lax, fortis, and aspirated stops in apraxic patients (한국어 파열음에 나타나는 실행증 환자의 음성적 특성 연구)

  • Kim Sujung;Kim Yunjung;Hong Jongseon
    • MALSORI
    • /
    • no.38
    • /
    • pp.125-136
    • /
    • 1999
  • This study examined the perception and production of Korean lax, fortis and aspirated stops in three apraxic patients. All of tile subjects made more production errors than perception errors. This indicates that apraxic patients have problems in phonetic execution rather than phonological representation. Additionally, in both production and perception, there were more errors in non-word-initial consonants than in word-initial consonants. These findings contradict those of the previous studies which report more errors in word-initial consonants. This study also found that, unlike previous studies in the types of errors made, distortion errors were high in both non-word-initial and word-initial consonants in apraxic patients. Generally, VOT of the stops showed significant differences among lax, fortis, and aspirated stops, which indicates that there is a failure not in choosing the appropriate stop but in positioning or motor planning at the articulation stage.

  • PDF

Multiple Comparison for the One-Way ANOVA with the Power Prior

  • Bae, Re-Na;Kang, Yun-Hee;Hong, Min-Young;Kim, Seong-W.
    • Communications for Statistical Applications and Methods
    • /
    • v.15 no.1
    • /
    • pp.13-26
    • /
    • 2008
  • Inference on the present data will be more reliable when the data arising from previous similar studies are available. The data arising from previous studies are referred as historical data. The power prior is defined by the likelihood function based on the historical data to the power $a_0$, where $0\;{\le}\;a_0\;{\le}\;1$. The power prior is a useful informative prior for Bayesian inference such as model selection and model comparison. We utilize the historical data to perform multiple comparison in the one-way ANOVA model. We demonstrate our results with some simulated datasets under a simple order restriction between the treatments.

Literature Review on One.Handed Manual Material Handling (한손 수동물자취급에 관한 문헌 조사)

  • Mo, Seung-Min;Kwag, Jong-Seon;Jung, Myung-Chul
    • Journal of the Ergonomics Society of Korea
    • /
    • v.29 no.5
    • /
    • pp.819-829
    • /
    • 2010
  • By referring thirty-seven previous studies on manual material handling (MMH), this paper analyzed guidelines and main factors of one-handed tasks. The previous studies concerned main factors of distance, weight, frequency, posture, gender, age, training, direction of force, height of the force exerted, and object shape and size. Based on these factors, the criteria used to understand one-handed tasks were objective measures of maximum strength, reaction force, etc., psychophysical measures of maximum acceptable frequency and weight, etc., and physiological measures of oxygen uptake, heart rate, electromyography, etc. An allowance threshold model regarding quantitative and objective fatigue and workload would be suggested for future research. This study would be expected that it serve to establish and Korean recommendations of one-handed tasks.