• 제목/요약/키워드: knowledge variation

검색결과 315건 처리시간 0.031초

A study for the characteristics of milli-gloss variation of unprinted coated paper and objective measurement tools for it

  • Jeon, Sung J.;Song, Yo H.;Lee, Jae S.;Shim, Gyu S.
    • 한국펄프종이공학회:학술대회논문집
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    • 한국펄프종이공학회 2000년도 춘계학술발표논문집
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    • pp.118-125
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    • 2000
  • Gloss uniformity on unprinted coated papers is oftenly called as 'Surface Feeling' in market and roles as a very important criteria when a customer choose a paper. However, there is few researches on this quality so far and even there isn't much knowledge on the characteristics of gloss variation, ie what it is, where it comes from etc. Therefore, there should be a pre-research on its characteristics, factors, measuring method or tools prior to the following development activities. In this paper, we obtained about a dozen of papers including foreign products and measured not only basic properties of them, but also various characteristics related to ununiformity. Our experiments went further to printing, but that area is excluded in this paper. Also, we investigated several instruments for measuring gloss variation by an objective way all over the world and tested with our own samples so that we tried to find out which one is best-correlated with visual appreciation and suggest its results as possible. We found out several things from these experiments including what is difference between good and bad gloss uniformity, the factors of gloss variation, and the results of measurement for gloss variation with instruments.

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정밀영양: 개인 간 대사 다양성을 이해하기 위한 접근 (Precision nutrition: approach for understanding intra-individual biological variation)

  • 김양하
    • Journal of Nutrition and Health
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    • 제55권1호
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    • pp.1-9
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    • 2022
  • In the past few decades, great progress has been made on understanding the interaction between nutrition and health status. But despite this wealth of knowledge, health problems related to nutrition continue to increase. This leads us to postulate that the continuing trend may result from a lack of consideration for intra-individual biological variation on dietary responses. Precision nutrition utilizes personal information such as age, gender, lifestyle, diet intake, environmental exposure, genetic variants, microbiome, and epigenetics to provide better dietary advices and interventions. Recent technological advances in the artificial intelligence, big data analytics, cloud computing, and machine learning, have made it possible to process data on a scale and in ways that were previously impossible. A big data platform is built by collecting numerous parameters such as meal features, medical metadata, lifestyle variation, genome diversity and microbiome composition. Sophisticated techniques based on machine learning algorithm can be used to integrate and interpret multiple factors and provide dietary guidance at a personalized or stratified level. The development of a suitable machine learning algorithm would make it possible to suggest a personalized diet or functional food based on analysis of intra-individual metabolic variation. This novel precision nutrition might become one of the most exciting and promising approaches of improving health conditions, especially in the context of non-communicable disease prevention.

지식공간론에 기초한 천문학적 공간개념의 위계 분석 (Hierarchical Analysis of Astronomical Space Concepts Based on the Knowledge Space Theory)

  • 윤마병;김희수
    • 한국지구과학회지
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    • 제31권3호
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    • pp.259-266
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    • 2010
  • 학습자의 개별 정답 문항에서 얻어지는 단편적인 정보들로부터 평가에 관련되는 지식 전체에 대한 정보를 추론할 수 있는 지식공간론을 활용하여 고등학생의 천문학적 공간개념에 대한 위계와 개별 학생의 지식상태를 분석하였다. 천문학적 공간개념을 구성하는 요인의 위계는 '공간위치$\ll$공간추리$\ll$공간변화'로 분석되었다. 또한 지식공간론을 활용한 평가 자료의 분석은 기존의 평가 방법으로는 알 수 없었던 평가 문항과 문항 간의 관계와 학생 개개인의 지식상태를 알 수 있게 함으로서 학습자의 수준별 개별화 학습과 교육과정 선정에서 많은 시사점을 찾을 수 있다.

확장된 변이 규칙을 이용한 용어의 점진적 획득 (An Incremental Acquisition of Terms Using Extended Variation Rules)

  • 정한민;김영길;최승권
    • 한국정보과학회 언어공학연구회:학술대회논문집(한글 및 한국어 정보처리)
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    • 한국정보과학회언어공학연구회 1998년도 제10회 한글 및 한국어 정보처리 학술대회
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    • pp.111-117
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    • 1998
  • 자연어 처리 응용 분야에서 다양하게 이용할 수 있는 용어들을 자동적으로 획득하고, 나아가 이 과정을 점진적으로 반복하여 수행함으로써 획득할 수 있는 용어의 수를 증가 시키고 그 용어들 간의 의미적 관계도 얻을 수 있다. 점진적인 용어 획득을 위하여 용어의 형태에 변이 규칙을 적용하여 새로운 용어를 획득하는 과정을 반복한다. 우리는 변이의 종류를 단어간의 변이 뿐만 아니라 단어 내의 변이 그리고 이 둘을 결합한 복합 변이로까지 확장하여 새로운 용어 획득 과정을 더욱 다양화하는 기법을 제시한다. 실험은 확장된 변이 규칙으로부터 얻은 용어들 중에서 기존의 단어간의 변이로부터 획득한 용어들의 비율이 전체의 38.6%라는 사실로부터 변이의 종류 및 규칙의 확장이 획득할 수 있는 용어들의 수를 증가 시킬 수 있다는 것을 보여준다.

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고속 공기압 실린더의 피스톤 실 단면형상 변화에 따른 마찰특성 (The Friction Characteristics with Variation of Cross Section of Piston Seals for High Speed Pneumatic Cylinders)

  • 김도태;장중걸
    • 드라이브 ㆍ 컨트롤
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    • 제9권1호
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    • pp.18-24
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    • 2012
  • The paper deals with the design of a new low-friction seal for a pneumatic cylinder with high speed actuation. The seal performance with variation of the cross sections in piston seals with elastomeric material was investigated to minimize the friction forces using ABAQUS. The contact stress and strain distributions and frictional forces of the piston seals were investigated with variation of interference fits, supply pressures and friction coefficients. To develop adequate and productive procedures, the finite element models of the piston seals were created and nonlinear analysis of a seal design was conducted in order to build further knowledge and understanding of the seal's performance characteristics.

Generalized State-Space Modeling of Three Phase Self-Excited Induction Generator For Dynamic Characteristics and Analysis

  • Kumar Garlapati Satish;Kishore Avinash
    • Journal of Electrical Engineering and Technology
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    • 제1권4호
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    • pp.482-489
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    • 2006
  • This paper presents the generalized dynamic modeling of self-excited induction generator (SEIG) using state-space approach. The proposed dynamic model consists of induction generator; self-excitation capacitance and load model are expressed in stationary d-q reference frame with the actual saturation curve of the machine. An artificial neural network model is implemented to estimate the machine magnetizing inductance based on the knowledge of magnetizing current. The dynamic performance of SEIG is investigated under no load, with the load, perturbation of load, short circuit at stator terminals, and variation of prime mover speed, variation of capacitance value by considering the effect of main and cross-flux saturation. During voltage buildup the variation in magnetizing inductance is taken into consideration. The performance of SEIG system under various conditions as mentioned above is simulated using MATLAB/SIMULINK and the simulation results demonstrates the feasibility of the proposed system.

벡터제어-구동 유도전동기의 파라미터 변동에 대한 비선형 제어특성의 해석 (Analysis of Nonlinear Control Characteristic for the Parameter Variation of Vector Control-Fed Induction Motors)

  • 손진근;석원엽;송양회;전희종
    • 전기학회논문지P
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    • 제53권2호
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    • pp.51-57
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    • 2004
  • Vector control schemes are used in inverter-fed induction motor drives to obtain high performance. Crucial to the success of the vector control scheme is the knowledge of the instantaneous position of the rotor flux. However, the position of the rotor flux change with temperature and magnetic saturation of the motor. This variation cause deterioration of both steady state and dynamic operation of the motor drives. Performance degradation is in the form of input-output torque nonlinearity and saturation of the motor. Analytic expressions are derived to evaluate the effects due to parameter sensitivity. Also, dynamic response is shown by speed command with the variation of stator and rotor resistance.

Clinical statistics: five key statistical concepts for clinicians

  • Choi, Yong-Geun
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제39권5호
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    • pp.203-206
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    • 2013
  • Statistics is the science of data. As the foundation of scientific knowledge, data refers to evidentiary facts from the nature of reality by human action, observation, or experiment. Clinicians should be aware of the conditions of good data to support the validity of clinical modalities in reading scientific articles, one of the resources to revise or update their clinical knowledge and skills. The cause-effect link between clinical modality and outcome is ascertained as pattern statistic. The uniformity of nature guarantees the recurrence of data as the basic scientific evidence. Variation statistics are examined for patterns of recurrence. This provides information on the probability of recurrence of the cause-effect phenomenon. Multiple causal factors of natural phenomenon need a counterproof of absence in terms of the control group. A pattern of relation between a causal factor and an effect becomes recognizable, and thus, should be estimated as relation statistic. The type and meaning of each relation statistic should be well-understood. A study regarding a sample from the population of wide variations require clinicians to be aware of error statistics due to random chance. Incomplete human sense, coarse measurement instrument, and preconceived idea as a hypothesis that tends to bias the research, which gives rise to the necessity of keen critical independent mind with regard to the reported data.

회전자와 고정자 저항 변동에 영향을 받지 않는 유도전동기의 새로운 벡터제어 기법 (A new vector control approach for induction motor without influence of rotor resistance and stator resistance variation)

  • 변윤섭;백종현;왕종배;박현준
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 하계학술대회 논문집 D
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    • pp.2371-2373
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    • 2000
  • This paper presents a new vector control scheme for induction motor. An exact knowledge of the rotor flux position is essential for a high-performance vector control. The position of the rotor flux is measured in the direct scheme and estimated in the indirect schemes. Since the estimation of the flux position requires a priori knowledge of the induction motor parameters, the indirect schemes are machine parameter dependent. The rotor and stator resistance among the parameters change with temperature. Variations in the parameters of induction machine cause deterioration of both the steady state and dynamic operation of the induction motor drive. Several methods have presented to minimize the consequences of parameter sensitivity in indirect scheme. In this paper, new estimation scheme of rotor flux position is presented to eliminate sensitivity due to variation in the resistance. The simulation is executed to verify the proposed vector control performance and to compare its performance with that of indirect vector control.

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Conformance of Accounting Education in Saudi Arabia Universities to the International Accounting Education Standards: An Exploratory Study

  • AL-DHUBAIBI, Ahmed Abdullah Saad
    • The Journal of Asian Finance, Economics and Business
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    • 제9권6호
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    • pp.313-324
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    • 2022
  • The goal of this research is to see how closely accounting programs in Saudi Arabian colleges comply with the International Accounting Education Standards (IESs). Further, it aims to assess the level of awareness and knowledge of IESs among accounting academics and to examine the possible explanatory factors for their variation. A structured questionnaire was sent to accounting faculty members at 37 Saudi universities. Out of 541 distributed questionnaires, a total of 102 usable responses were received from 26 universities. The findings show that accounting programs in Saudi universities are partially compliant with the guidelines of IESs and accounting academics in those universities are moderately aware of IESs. High variation in the level of academics' knowledge of IESs was detected and was significantly influenced by industry work experience, academic ranks, and professional qualification. The findings of this study suggest that Saudi Universities should work closely with the local and international accounting professional bodies, i.e. the Saudi Organization for Chartered and Professional Accountants (SOCPA) and the International Federation of Accountants (IFAC) to improve accounting programs based on the guidelines of IESs to cope with the recent changes in the capital market of the kingdom and the adoption of the International Financial Reporting Standards.