• 제목/요약/키워드: phase shifts

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Phase Shifts of Bound State Waves Scattered at Classical Turning Points: Morse Potential

  • Sun, Ho-Sung
    • Bulletin of the Korean Chemical Society
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    • 제26권11호
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    • pp.1717-1722
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    • 2005
  • The analytical transfer matrix method suggests a new quantization condition for calculating bound state eigenenergies exactly. In the quantization condition, the phase shifts of bound state wave functions scattered at classical turning points are explicitly introduced. We calculate the phase shifts of eigenfunctions of the Morse potential with various boundary conditions in order to understand the physical meaning of phase shifts. The Morse potential is known to adequately describe the interaction energy between two atoms and, therefore, it is frequently used to determine the vibrational energy levels of diatomic molecules. The variation of Morse potential eigenenergies influenced upon by changing boundary conditions is also investigated.

90/150 셀룰라 오토마타에 의해 생성되는 PN 수열들 사이의 상대적 위상이동차에 대한 알고리즘 (Algorithm for The Relative Phase Shifts between PN Sequences Generated by 90/150 Cellular Automata)

  • 조성진;최언숙;김한두
    • 정보보호학회논문지
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    • 제15권4호
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    • pp.3-10
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    • 2005
  • 이 논문에서는 최대길이를 갖는 90/150 셀룰라 오토마타로부터 얻어진 수열에 대해 대수적으로 연구한다. GF(2) 위에서 최대길이를 갖는 n-셀 90/150 셀룰라 오토마타는 길이가 $2^n-1$인 수열을 생성한다. 이러한 셀룰라 오토마타의 임의의 셀에 대한 출력수열은 다른 셀에 대한 출력수열의 위치를 이동함으로써 얻어질 수 있다. LFSR과는 달리, 셀룰라 오토마타의 셀들에 대한 출력수열들의 위상이동차는 일반적으로 셀룰라 오토마타의 단계들 사이에서 다르다. 본 논문에서는 이러한 셀들 사이의 상대적인 위상이동차를 계산하는 알고리즘을 제시한다. 이 알고리즘은 Sarkar의 알고리즘과 달리 Shank의 알고리즘을 이용하지 않으며, 원하는 위치의 위상이동차를 계산하기 위하여 이전 셀의 위치의 위상이동차를 계산할 필요가 없으며 수행시간은 $O(2^n)$이다.

Pigment-dispersing factor induces phase shifts of circadian locomotor rhythm in the cricket Gryllus bimaculatus

  • Singaravel, Muniyandi;Tomioka, Kenji
    • Journal of Photoscience
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    • 제9권2호
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    • pp.243-245
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    • 2002
  • Pigment-dispersing factor (PDF) is an octadecapeptide distributed in the optic lobe and the brain in a variety of insect species. There are lines of evidence suggesting possible involvement of PDF in the insect circadian system. However, its physiological roles in the circadian time keeping mechanism have not been clearly defined. In this study, we have examined the phase shifting effects of Gryllus-PDF on the circadian locomotor rhythm in the cricket Gryllus bimaculatus of which circadian clock is located in the optic lobe. Phase shifts in the circadian activity rhythm were measured following microinjection of 22nl of vehicle (Ringer's solution) or O.lmM PDF into the optic lobe through the compound eye at various circadian times. The results showed that PDF induced phase shifts of the circadian clock in a phase-dependent manner, suggesting that it may play a role as an input signal for the circadian clock.

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위상이동차를 이용한 수축 생성기의 분석 (Analysis of Shrinking Generator Using Phase Shifts)

  • 황윤희;조성진;최언숙
    • 한국정보통신학회논문지
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    • 제14권11호
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    • pp.2507-2513
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    • 2010
  • 원시다항식을 특성다항식으로 갖는 두 개의 LFSR로 구성된 수축 생성기를 삽입 생성기로 해석하고, 생성된 수열들 간의 위상이동차(phase shift)에 대하여 분석한다. 또한 위상이동차를 이용하여 수축 생성기에 의하여 생성된 수열의 부분수열을 알 때 나머지 수열을 구하는 방법을 제안한다.

Phase-Shifted Fiber Bragg Grating Transmission Filters Based on the Fabry-Perot Effect

  • Liu, Y.u;Lee, S. B.;Choi, S. S.
    • Journal of the Optical Society of Korea
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    • 제2권1호
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    • pp.30-33
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    • 1998
  • We present the analysis of phase-shifted fiber Bragg gratings by coupled-mode equations. The transmission is expressed as that of a Fabry-Perot resonator with complex reflectance and complex transmittance. The transmission spectrum, the effective cavity length, and the behaviors with different phase-shifts are investigated. A very flattered transmission peak is obtained by introducing three phase-shifts in a grating.

위상 이동 그림자 무아레 방법을 이용한 3차원 형상의 측정 (Measurement of three dimensional shapes using phase-shifting shadow moire method)

  • 강영준
    • 한국생산제조학회지
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    • 제6권4호
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    • pp.39-45
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    • 1997
  • Shadow moire topography has been used as a noncontact method for measuring the 3-D shapes of objects. The moire fringes are results from the superposition of a master grating and its shadow projected on the surface of an object. But in case of the classical shadow moire method, in general, the resolution is a few tenths of millimeter. It is difficult to use a phase -shifting method in shadow moire because it is impossible to obtain uniform phase shifts on the whole field. But in this study , We introduce a phase-shifting method to improve the resolution of the classical shadow moire method. This method is based on the fact that if the depth of object is much less than the distance between the observer and the master grating, the phase shifts are almost uniform on the whole field area. Finally, we applied this new phase-shifting method to the measurement of the 3-D shape of a coin.

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위상이동 그림자 무아레법을 이용한 3차원 물체의 형상측정 (Measurement of three dimensional object shape by means of the phase-shifting shadow moire)

  • 유원재;노경완;강영준
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 춘계학술대회 논문집
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    • pp.96-100
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    • 1997
  • The shadow moire is one of the optical techniques which is able to give contour lines of an object with respect to a master grating plane. The moire patterns are issued from the superposition of a master grating and its shadow projected on the surface of an object. In case of the classical shadow moire method, the sensitivity was a few tenths millimeters. generally, it is difficult to use a phase shift method in shadow moire because it is impossible to obtain uniform phase shifts on the whole field. But in this study we use the fact that if the depth of object is much less than the distance between the observer and the master grating, and the object is displaced perpendicularly to the grating plane, phase shifts are almost uniform. Finally we obtained a better resolution by using a phase shift procedure and applied the phase shifting shadow moire to three dimensional shape measurement.

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섬유다발 배열 및 적층수에 따른 평직복합재료 등가물성치의 변화에 관한 통계적 연구 (A Statistical Study of Effective Properties due to Fiber Tow Misalignment and Thickness Change for Plain Weave Textile Composites)

  • 우경식;서영욱
    • Composites Research
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    • 제13권6호
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    • pp.63-72
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    • 2000
  • 본 논문에서는 평직복합재료의 섬유다발의 배열 및 적층수가 등가물성치에 미치는 영향을 연구하였다. 임의로 적층된 2~32장의 평직복합재료 구조물의 단위구조를 모델링 하였고, 단위구조의 외부 경계 면에는 반복 경계조건을 가하였다. 등가물성치는 일축 인장시험 및 전단시험을 수치적으로 모사하여 계산하였고, 섬유다발 위상차의 무작위적 특성은 표본해석을 통해 고려하였다. 계산 된 등가물성치의 통계처리 결과, 두께가 얇은 평직복합재료의 $E_{xx}$$V_{xy}$는 위상차의 영향을 크게 받았고, 넓은 빈도분포를 보였다. 그러나 적층수가 증가함에 따라 분포의 폭은 감소하였고 평균값은 일정한 값으로 수렴하였다. 반면에, 섬유다발의 면내 방향으로의 이동 및 적층수의 변화는 $G_{xy}$에 거의 영향을 미치지 않는 것으로 나타났다.

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임상 간호사의 교대근무 방향아 circadian rhythm 변화에 미치는 영향 (The Effect of Shift Directions of Clinical Nurses on the Circadian Rhythm)

  • 황애란;정현숙;강규숙;이규정
    • 기본간호학회지
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    • 제1권1호
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    • pp.77-97
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    • 1994
  • The circadian system represents a temporal order which is mediated by the mutual coupling of oscillators and by the synchronizing effects of zeitgebers. It is known that well-being of man depends partly on the maintenance of this order, and that repeated or long lasting disturbances to it such as shift work will Cause harmful effects. This study was a quasi-experimental study to test the effect of shift directions for the clinical nurses on the circadian rhythm. Fourteen nurses working at the general units of Y hospital were selected according to the established criteria. Fourteen subjects were assigned to a weekly shift but the directions of shift work were phase delay first and then phase advance or vice versa. Oral temperature, total sleeping time, frequency of sleep-wake cycle, fatigue, mental performance, and physical symptom were measured during these days except holidays. The data collection period was from April 26, 1993 to July 3, 1993. MANOVA and Wilcoxon signed rank test were used for statistical analysis. The results are summarized as follows. 1. Having worked on evening and night shifts in either phase delay or phase advance schedules, temperature rhythms of shift workers were gradually adapted to the new sleep-wake cycles. A complete adaptation to work on the night shift was achieved the sixth day of the night shift in the phase delay schedule compared to the partial adaptation to the work on the night shift in the phase advance schedule. Accordingly, by putting evening shift between day and night shifts, it will be possible for circadian rhythm to adapt easily to the night shift. 2. There were differences in the total sleeping time, frequency of steep-wake cycle, fatigue, and physical symptom except for mental performance between night shift and day, evening shift. This indicates further that shift workers working on the night shift have a hard time adapting to the shift work compared to the other shifts. 3. Evaluating all the acrophases of temperature rhythm either in phase delay or phase ad-vance schedules, it was shown that night to evening shift in the phase ad-vance schedule revealed the smallest phase move. Also phase advance schedule showed poorer adaptation to shift work than phase delay schedule in connection with total sleeping time, frequency of sleep-wake cycle, fatigue, mental performance, and physical symptom. It is suggested, taken together, these findings reflect that phase delay schedule facilitated the degree of adjustment to the shift work compared to the phase advance schedule.

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Investigation on structural symmetry of CsCoCl3·2H2O crystals by magic-angle spinning 1H and static 133Cs nuclear magnetic resonance

  • Park, Sang Hyeon;Jang, Du Chang;Jeon, Hara;Gyeong, Oh Yi;Lim, Ae Ran
    • 한국자기공명학회논문지
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    • 제26권1호
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    • pp.10-16
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    • 2022
  • The phase transition temperatures of CsCoCl3·2H2O crystals are investigated via differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Three endothermic peaks at temperatures of 370 K (=TC1), 390 K (=TC2), and 416 K (=TC3) were observed for phase transitions from CsCoCl3·2H2O to CsCoCl3·1.5H2O, to CsCoCl3·H2O, and then to CsCoCl3·0.5H2O, respectively. In addition, the spin-lattice relaxation time T in the rotating frame and T1 in the laboratory frame as well as changes in chemical shifts for 1H and 133Cs near TC1 were found to be temperature dependent. Our analyses results indicated that the changes of chemical shifts, T, and T1 are associated with structural phase transitions near temperature TC1. The changes of chemical shifts, T, and T1 near TC1 were associated with structural phase transitions, owing to the changes in the symmetry of the structure formed of H2O and Cs+ ions. Consequently, the structural symmetry in CsCoCl3·2H2O crystals based on temperature is discussed by the environments of their H and Cs nuclei.