• 정보처리학회논문지D
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• 제16D권4호
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• pp.527-540
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• 2009

상태 다이어그램은 객체가 가질 수 있는 상태와 각 상태에서 수행 할 수 있는 전이를 사용하여 객체의 동적행위를 표현한다. 본 논문에서는 클래스 연산들의 선행/후행 조건들을 이용하여 상태다이어그램을 자동으로 생성하는 기법을 제안한다. 그리고 본 논문에서 제시한 기법을 구현하는 도구 SDAG(State Diagram Automatic Generation Tool)을 제작하였다. 추가적으로 생성된 상태 다이어그램의 복잡도를 감소시키기 위하여 연산의 종류를 고려한 상태 다이어그램 생성 방법과 생성된 다이어그램을 측정하는 방법을 제안하고 실험하였다.

• International Journal of Computer Science & Network Security
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• 제22권9호
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• pp.396-402
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• 2022

The study deals with the problem of the formation of pre-service teachers' reflective skills in information environment. The role of reflection as a mechanism of formation of a modern teacher's self-consciousness was cleared up. The technology of formation of pre-service teachers' reflective skills was characterized and tested. The main stages of the technology were: a motivational and cognitive stage, a problematic and practical stage, and a reflective and operational stage. The substantiated pedagogical conditions of formation of pre-service teachers' reflective skills were adhered. The criterial and evaluative characteristics of the formation of pre-service teachers' reflective skills were worked out: components (reflection of personal conformity, reflection of the psychological and pedagogical barriers, reflection of professional growth); criteria (criterion of consistency, criterion of difficulty, criterion of potential); indicators (cognitive-evaluative, value-motivational, activity-creative). The levels of formation of pre-service teachers' reflective skills (insufficient level, acceptable level, and optimum level) were determined. The analysis of students' surveys showed the effectiveness and expediency of using the technology of formation of pre-service teachers' reflective skills in the process of professional training.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part 1
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• pp.266-267
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• 2006

We present a systematic study of the heating and pre-sintering behavior of porous copper powder metal compacts. We employ a TE102 single mode microwave system to position the samples in the separated electric field (E) or magnetic field (H) anti-node of the cavity. We observe significant differences in the heating, pre-sintering, and microstructure evolution of the samples due to the individual fields. We note that sample history (whether heated first in the E-field or H-field) greatly effects a difference in heating trends and subsequent heating behavior and does not appear to be solely a thermal process.

• 한국철도학회논문집
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• 제2권3호
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• pp.9-17
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• 1999

This paper presents a new algorithm to determine the pre-loads that sustain the static equilibrium state in a given position. The algorithm which uses a partial velocity matrix leads to an unconstrained optimization problem to compute the pre-loads of the suspensions. To demonstrate the validity of the proposed algorithm, the static analysis results that employ the pre-loads of three examples are presented using a reliable commercial program. Results of the analysis confirm the validity of the proposed algorithm.

• Bulletin of the Korean Chemical Society
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• 제27권10호
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• pp.1618-1622
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• 2006

Bacteriophage T7 gp4A' is a ring-shaped hexameric DNA helicase that catalyzes duplex DNA unwinding using dTTP hydrolysis as an energy source. To investigate the effect of single-stranded DNA (ssDNA) on the kinetic pathway of dTTP hydrolysis by the T7 DNA helicase complexed with ssDNA, we have first determined optimal concentration of long circular M13 single-stranded DNA and pre-incubation time in the absence of $Mg^{2+}$ which is necessary for the helicase-ssDNA complex formation. Steady state dTTP hydrolysis in the absence of $Mg^{2+}$ by the helicase-ssDNA complex provided $k_{cat}$ of $8.5\;{\times}\;10^{-3}\;sec^{-1}$. Pre-steady state kinetics of the dTTP hydrolysis by the pre-assembled hexameric helicase was monitored by using the rapid chemical quench-flow technique both in the presence and absence of M13 ssDNA. Pre-steady state dTTP hydrolysis showed distinct burst kinetics in both cases, indicating that product release step is slower than dTTP hydrolysis step. Pre-steady state burst rates were similar both in the presence and absence of ssDNA, while steady state dTTP hydrolysis rate in the presence of ssDNA was much faster than in the absence of ssDNA. These results suggest that single-stranded DNA stimulates dTTP hydrolysis reaction by T7 helicase by enhancing the rate of product release step.

• 대한간호
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• 제36권5호
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• pp.63-73
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• 1998

The home visiting health nurses are important man-power who can serve various and persistent rehabilitation care to disabled person in community. The Community Based Rehabilition project(CBR) of national rehabilition center have been carried out from 1995. As a part of that project national health center performed rehabilition education program for home visiting health nurses. The purpose of this study is to analysis the effect of this education. In the first stage all of those groups were educated for two weeks in national rehabilitation center. But only two group nurses, one is in a urban and the other in a rural community, have been educated continually in the field through discussing rehabilitation care case study. The data in this study were gathered from three group healh nurses and analysed by SAS computer program. The results about knowledge, attitude and practice changes of the three group nurses were as follows. 1. In the pre education state the mean point of all nurses' attitude for rehabilition was 59, but in the post education state that was 90. The difference between pre and post attitude is very significant(t=-14.1. p<0.0001l). 2. In the pre education state the mean point of all nurses' knowledge for rehabilition was 45, but in the post education state that was 78. The difference between pre and post knowledge is very significant(t=-12.7, p<0.000l). 3. In the pre education state the mean point of all nurses' practice for rehabilition care was 37, but in the post education state that was 62. The difference between pre and post practice is very significant(t=-7.3, p<0.000l). 4. In practice point, the two group nurses who have been educated continuously were superior to the other(t=-3.9. p<0.00l). 5. All points between the urban and rural nurses were no significant differences(p>0.l). 6. All changes of the attitude, knowledge and practice did not affected by age(F=0.58, p>0.l). professional career(F=O.61, p>0.l), educational background(F=0.97, p>0.l).

• Carbon letters
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• 제12권2호
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• pp.107-111
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• 2011

Polyacrylonitrile (PAN) fibers were pre-oxidized in a temperature range of 180-275$^{\circ}C$. The effects of positive and negative stretching on the structure and morphology of PAN fiber in the pre-oxidation process were studied by FTIR spectroscopy, XRD, and SEM. Mechanical property changes were also investigated. No changes in the movement and intensity of functional groups of PAN fibers were caused by positive stretching of up to 10% and negative stretching down to -8%. The crystal structure can be affected by the positive stretching and negative stretching. The maximum strength is 479.81 MPa when the stretching is positive, and the maximum strength is 420.55 MPa when the stretching is negative.

• Geomechanics and Engineering
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• 제19권5호
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• pp.421-434
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• 2019

It is of great significance to study the mechanical properties and failure mechanism of the defected rock for geological engineering. The defected sandstone modeling with power-law distribution of pre-cracks was built in this paper by Particle Flow Code software. Then the mechanical properties of sandstone and the corresponding failure process were meticulously analyzed by changing the power-law index (PLI) and the number of pre-cracks (NPC). The results show that (1) With the increase of the PLI, the proportion of prefabricated long cracks gradually decreases. (2) When the NPC is the same, the uniaxial compressive strength (UCS) of sandstone increases with the PLI; while when the PLI is the same, the UCS decreases with the NPC. (3) The damage model of rock strength is established based on the Mori-Tanaka method, which can be used to better describe the strength evolution of damaged rock. (4) The failure mode of the specimen is closely related to the total length of the pre-crack. As the total length of the pre-crack increases, the failure intensity of the specimen gradually becomes weaker. In addition, for the specimens with the total pre-crack length between 0.2-0.55 m, significant lateral expansion occurred during their failure process. (5) For the specimens with smaller PLI in the pre-peak loading process, the concentration of the force field inside is more serious than that of the specimens with larger PLI.

• 대한간호학회지
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• 제36권5호
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• pp.732-741
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• 2006

Purpose: This study was to investigate the effects of non-nutritive sucking on physiological and behavioral state of pre-term infants during tube feeding. Method: This nonequivalent, non-synchronized experimental study included 50 pre-term infants. An attempt was made to match gestational age and birth weight of infants in each group. Infants in the experimental group were given a pacifier 2 minutes before, during, and for 2 minutes after tube feeding. Infants in the control group did not get a pacifier. Both groups were tested at three stages for changes in the physiologic state and behavioral state - 2 minutes before, during, and 2 minutes after feeding. Date was analyzed with SPSS WIN 10.0 using an $X^2$-test, t-test, and repeated measures ANOVA. Result: Heart rates and oxygen saturation levels of the two groups were significantly different(P=.001, P=.000). The behavioral states of the two groups were significantly different during and post feeding(P=.000, P=.000). Conclusion: This result suggests non-nutritive sucking by using a pacifier is an effective intervention for pre-term infants during tube feeding.

• Bulletin of the Korean Chemical Society
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• 제13권6호
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• pp.613-620
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• 1992

The solvent-dependent photophysical properties of 2-biphenylcarboxylic acid (2BPCA) and 4-biphenylcarboxylic acid(4BPCA), which have a pre-twisted conformation in the ground state, have been investigated. The fluorescence spectra of 4BPCA show vibrational structure with a non-mirror image to the absorption spectra in nonpolar solvent while those of 2BPCA show no structure even in nonpolar solvents. As the solvent polarity increases, the fluorescence spectra become diffuse and broad with a strong red shift resulting in the large Stokes shift. The large fluorescence Stokes shift of BPCA's in polar solvent is also partially due to an intramolecular charge transfer (ICT) interaction in the excited state, as demonstrated by the large dipole moment in the excited state (7.6-10.6 D). The fluorescence decay behaviors of BPCA's (decay-times and their pre-exponential factors) also depend on solvent polarity in agreement with the solvent-dependent properties of the steady-state fluorecence. The data have been discussed in terms of change in the excited-state potential energy surface with respect to change of the dihedral angle of biphenyl moiety.