• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.879-882
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• 2008

The discotic liquid crystal in compensating film used for the viewing angle improvement of the twist nematic liquid crystal display panel is analyzed. For the optical characterization of the compensating film, we measured the polarization state of the light passing through the film as the tilt angle and the azimuth angle of the film were varied, and then we compared the measured polarization state with the calculated one. Finally we suggested the best fit configuration of the discotic liquid crystal.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1913-1919
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• 2007

Substantive provisions of the concept of an estimation and safety of complex technical systems are envisaged. New problems are assume orientation to use of the formalized methods of an estimation of residual resources of reliability of objects, and also development of other methodological base in creation of complex technical systems that is connected with detailed elaboration of attention to a safety at all stages of creation of systems: from designing until operation. In this connection existing large objects should be provided by the developed systems of engineering monitoring and diagnostics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 G
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• pp.2348-2350
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• 1998

The hybrid control system for a wheeled mobile robot with nonholonomic constraints to perform a cluttered environment maneuver is proposed. The proposed hybrid control system consists of a continuous state system for the trajectory control, a discrete state system for the motion and orientation control, and an interface control system for the interaction process between the continuous dynamics and the discrete dynamics The continuous control systems are modeled by the switched systems with the control of driving wheels, and the digital automata for motion control are modeled and implemented by the abstracted motion of mobile robot. The motion control tasks such as path generation, motion planning, and trajectory control for a cluttered environment are investigated as the applications by simulation studies.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 B
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• pp.892-894
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• 1993

In this paper, a new control for the robust position control of a brushless direct drive(BLDD) motor using fuzzy logic controller(FLC) is presented. The integral-proportional(IP) position with speed FLC is employed to obtain the robust BLDD motor system, which is approximately linearized using the field-orientation method for an AC servo. The speed FLC for a BLDD motor has the two rule tables. One is the coarse rule table for the transient state and another is the fine rule table for the steady state. The overall system is controlled by using the microprossor in IBMPC 486 and the the robustness is also obtained.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 1997년도 International Symposium on Fire Science and Technology
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• pp.77-84
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• 1997

Cone calorimeter measurements can be used for the calculation of effective material properties, which can be used as input parameters in modeling of fire. Main parameter measured in Cone calorimeter is heat release rate. Some other parameters as time to ignition, effective heat of combustion, mass loss rate or total heat released is also measured in Cone calorimeter. Total heat released is important from the point of view of total energy available in material in Fire situation. Cone calorimeter. measurements were done on several wood species (oak, beech, spruce, poplar). Measurements were provided at external irradiances 30, 50 and 65 ㎾/$m_2$ in horizontal orientation. Heat release rate data were evaluated and compared as a function of external irradiance for various species of wood. furthermore the influence of external irradiance on effective heat of combustion and total heat release was also evaluated for the period of flame combustion.

• Geomechanics and Engineering
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• 제11권1호
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• pp.41-58
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• 2016

This paper focuses on the deformation behavior of tunnels crossing a weak zone in conventional tunneling. A three-dimensional finite element model was adopted that allows realistic modeling of the tunnel excavation and the support installation. Using the 3D FE model, a parametric study was conducted on a number of tunneling cases with emphasis on the spatial characteristics of the weak zone such as the strike and dip angle, and on the initial stress state. The results of the analyses were thoroughly examined so that the three-dimensional tunnel displacements at the tunnel crown and the sidewalls can be related to the spatial characteristic of the weak zone as well as the initial stress state. The results indicate that the effectiveness of the absolute displacement monitoring data as early warning indicators depends strongly on the spatial characteristics of the weak zone. It is also shown that proper interpretation of the absolute monitoring data can provide not only early warning for a weak zone outside the excavation area but also information on the orientation and the extent of the weak zone. Practical implications of the findings are discussed.

• Child Health Nursing Research
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• 제9권1호
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• pp.74-84
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• 2003

This study was designed to investigate effects of maternal education using Brazelton Neonatal Behavioral Assessment Scale(the following will be marked as NBAS) on the mother-infant interaction and infant behavior. The subjects of this study consisted of 48 pairs of normal mother and infant, 24 pairs for intervention group and 24 pairs for control group. The subjects were recruited from two general hospitals, and an OBGY clinic located in J city. The data were collected from July 30, 2001 to October 6, 2001. Prior to investigation and data collection, following operational hypotheses were set up in order to compare the investigative data against these operational hypotheses(H). H1: Intervention group will higher mother-infant interaction score than control group. H2: Intervention group infants will higher overall performance in infant behavior test score than control group infants. The results of this study were summarized as follows: 1. The mother-infant interaction score was 59.79 points in intervention group and 53.91 points in control group. The mother-infant interaction score of intervention group showed significant difference than control group. Therefore, hypothesis 1 was supported. 2. The infant behavior score of intervention group was significantly higher than control group, but partially. Therefore, hypothesis 2 was partially supported. 1) The social interaction(orientation) score was 46.58 points in intervention group and 43.50 points in control group. The orientation score of intervention group showed significant difference than control group. 2) The state regulation score was 26.79 points in intervention group and 25.33 points in control group. The state regulation score of intervention group showed significant difference than control group. In conclusion, present work demonstrated that maternal education using NBAS is an effective intervention method for promotion of mother-infant interaction and of infant behavior development. Author believes that many inexperience young mother may find NBAS-based maternal education beneficial for their nursing babies, therefore NBAS-based intervention is recommended to be adopted routinely as an integral part of neonatal nursing strategies.

• 영재교육연구
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• 제20권3호
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• pp.867-883
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• 2010

교육자가 동기, 목표지향, 학업태도 등의 중요성을 인식하는 것은 영재들의 긍정적인 학습 공동체를 수립하는데 고려해야할 중요한 요소이다. 본 연구의 목적은 한국과 미국에서 최소한 수학 한 과목에서 영재교육을 받고 있는 5, 6, 7학년 영재 학생들의 학업 태도 및 동기를 알아보기 위한 것이다. 2004년에 개발된 McCoach와 Siegle의 <학업태도 평가조사: 개정판>의 모든 하위요소를 국가 간, 남녀 간 비교 연구했다. 전체 507명 (한국 278명, 미국 229명)중 여학생들이 남학생보다 동기/자기규율에서 더 높은 점수를 보였으며, 미국 학생들이 한국학생들보다 학교, 학업관련 자기인식, 목표지향, 그리고 동기의 하위 영역에서 높은 점수를 보였다. 교사에 대한 태도 요인은 국가 또는 성별에서 차이가 없었다.

• 대한토목학회논문집
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• 제29권6B호
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• pp.527-535
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• 2009

본 연구에서는 수자원 전문가들에 대하여 설문조사를 실시하여 국내 홍수관리의 발전방향을 수립하고 이를 효과적으로 추진하기 위한 지속가능한 홍수관리 프레임워크와 프로세스를 개발하였다. 설문조사의 응답자들은 홍수피해를 저감하기 위하여 무분별한 인위적인 개발을 지양하고 체계적이고 장기적인 계획에 의해 지속적으로 홍수관리를 수행해야 한다는 의견을 주로 제시하였다. 개발된 프레임워크를 국내 정황에서 효과적으로 시행하기 위하여 설문조사결과를 반영하여 통합홍수관리, 홍수 위험도관리, 통합유역관리, 참여적 의사결정, 적응형 관리 등과 같은 5가지 요소를 선정하였다. 프레임워크는 선정된 요소들을 통합하여 수계에 적용하여 홍수관리의 목표를 달성하도록 하며, 주기적으로 평가하고 그 결과를 피드백하여 홍수관리의 목표와 방법론을 수정 및 보완하도록 구성되었다. 프레임워크를 구체화하기 위하여 홍수관리 프로세스를 설문조사결과를 반영하여 개발하였으며, 관련자들의 참여와 홍수관리 상태의 주기적인 평가를 통해 홍수위험도를 저감시킬 수 있는 대책을 선정하고 이들을 적응적으로 시행하도록 구성하였다.

• Journal of Microbiology
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• 제39권3호
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• pp.149-153
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• 2001

The electron transfer reaction is one of the most essential processes of life. Not only does it provide the means of transforming solar and chemical energy into a utilizable form for all living organisms, it also extends into a range of metabolic processes that support the life of a cell. Thus, it is of great interest to understand the physical basis of the rates and reduction potentials of these reactions. To identify the major determinants of reduction potentials in redox proteins, we have chosen the simplest electron transfer protein, rubredoxin, a small (52-54 residue) iron-sulfur protein family, widely distributed in bacteria and archaea. Rubredoxins can be grouped into two classes based on the correlation of their reduction potentials with the identity of residue 44; those with Ala44 (ex: Pyrococcus furiosus) have reduction potentials that are ∼50 mV higher than those with Va144 (ex: Clostridium pasteurianum). Based on the crystal structures of rubredoxins from C. pasteurianum and P. furiosus, we propose the identity of residue 44 alone determines the reduction potential by the orientation of the electric dipole moment of the peptide bond between 43 and 44. Based on 1.5 $\AA$ resolution crystal structures and molecular dynamics simulations of oxidized and reduced rubredoxins from C. pasteurianum, the structural rearrangements upon reduction suggest specific mechanisms by which electron transfer reactions of rubredoxin should be facilitated.