Plant regeneration from callus of Iris odaesanensis Y. N. Lee native to Korea via organogenesis

Bae, Kee-Hwa,Yoo, Kyoung-Hwa,Lee, Mi-Hyun,Jeong, Jae-Hun,Choi, Yong-Eui,Yoon, Eui-Soo The Korean Society of Plant Biotechnology 2013 식물생명공학회지 Vol.40 No.3

Iris odaesanensis Y. N. Lee. is an important endangered and native plant belonging to the family Iridaceae in Korea. This study describes a method for rapid micropropagation of this species via from leaf, rhizome and root explants derived calli. Leaf, rhizome and root explants were cultured on Murashige and Skoog (MS) medium supplemented with 2,4-dichlorophenoxy acetic acid (2,4-D) for callus induction. Rhizome explants yielded calli at a frequency of 72% when cultured at 1.0 mg/l 2,4-D. Calli were maintained at 1.0 mg/l 2,4-D. These calli were transferred to MS medium supplemented with 0, 0.5, 1.0, and 2.0 mg/l 2,4-D in combination with 0, 0.5, 1.0, and 3.0 mg/l BA for adventitious shoot induction. The highest number of adventitious shoot (228.9 per petri-dish) were formed at 1.0 mg/l 2,4-D and 1.0 mg/l BA. WPM medium was the best to convert calli into plantlets, where up to 98.2% of calli were regenerated into plantlets. This in vitro propagation protocol should be useful for conservation of this endangered plant.

Zr계 Vitreloy 박막의 특성에 대한 조사

이경민,이병준,김병훈,이의완,박동수 慶北大學校 師範大學 科學敎育硏究所 1999 科學敎育硏究誌 Vol.23 No.-

We have grown Zr based vitreloy alloy thin films by thermal deposition methode and ion beam sputtering method and compared them with Zr-Ti-Cu-Ni-Be bulk metallic glass bulk. Thermal analysis caused Zr-Ti-Cu-Ni-Be bulk metallic glass to recrystallize in the two region. The onset point temperature of the first region was 414.12℃ and the peak temperature was 410.02℃. The onset point temperature of the second region was 445.21℃ and the peak point temperature was 454.45℃. The X-ray diffraction measurement and thermal analysis as a function of temperature showed that the bulk metallic glass thin films recrystallize in the same temperature region. As a result, Zr based vitreloy alloy was the same as phase transition of bulk metallic glass bulk and bulk metallic glass thin film.

재발성 다발연골염 1례

이배혁,고의경,왕수건,전경명 釜算慶南耳鼻咽喉科學會 1994 임상이비인후과 Vol.5 No.1

강편 빌레트의 건식 자분 탐상

이의완,김구화,임종수 韓國非破壞檢査學會 1996 한국비파괴검사학회지 Vol.16 No.3

본 연구는 강편 빌레트의 표면 결함을 검출하기 위한 건식 자분 탐상에 관한 것으로 자분 탐상능을 대상체에 흘리는 자화 전류, 대상체의 온도, 자분의 총 분사량 등에 대하여 평가하였다. 선재 제품의 등급에 따라 필요로 하는 몇까지 강종을 선택하여 강종별 자기적 특성을 평가하였으며, 이를 입력자료로 하여 유한 요소법에 의한 자기 해석을 행하였고, 그 결과를 직류 자화 전류에 의한 누설 자속 측정 결과와 비교 분석하였다. 교류 자화 전류에 의한 건식 자분 탐상능을 직류 자화 전류에 의한 탐상능과 비교하여 강종 및 자화 전류의 유형에 따른 자화 전류치를 결정하였다. 직류 자화 전류에 의한 자분 탐상 결과를 유한 요소법에 의한 계산과 비교하였고, 빌레트의 표면과 표면 결함 부위에서 측정한 누설 자속으로 비교 결과를 평가하였다. 각 강편재의 경우 직류 자화 전류에 의한 표면 자장은 그 형상에 의한 영향으로 코너 부위에서는 면 중앙의 표면 자장치에 비해 30% 정도였으며, 교류 자화 전류에 의해서는 그 비율이 70%정도였다. 교류 자화 전류는 코너로부터 면중앙으로 10mm 되는 영역을 제외하고는 전 면에서 균일한 표면 자장을 발생하엿다. 대상체의 온도에 따른 자분의 흡착은 대상체의 온도 150℃까지는 큰 변화가 없으나 자분의 고착에 있어서 60℃ 이상의 고온재에 대해서는 융착 용매로 메틸렌 크로라이드를 사용하는 것이 부적합하였다. 자분의 총분사량은 자분 탐상능에 상당히 큰 영향을 미침을 확인하였고 이에 대한 정량적 평가를 행하였다. Dry magnetic particle inspection(MPI) was performed to detect the surface defects of steel ingot cast billets. Magnetic properties of several materials were characterized by the measurement of the B-H hysteresis curve. The inspection results were evaluated in terms of the magnetizing current, temperature, and the amount of magnetic particles applied to billets. Magnetic flux leakage near the defect site of interest was measured and with the results of calculation by the finite element method in the case of direct magnetizing current. Direct and alternating magnetizing currents for materials were deduced by the comparison of the inspections. Results of the magnetic particle inspection by direct magnetizing current were compared with those of finite element method calculations, which were verified by measuring magnetic leakage flux above the surface and the surface defects of the material. For square rods, due to the geometrical effect, the magnetic flux density at the edges along the length of the rods was about 30% of that at the center of rod face for a sufficiently large direct magnetizing current, while it was about 70% for an alternating magnetizing current. Thus, an alternating magnetizing current generates rather uniform magnetic flux density over the rods, except for the region on the face across about 10 mm from the edge. The attraction of the magnetic particle by the magnetic leakage field was nearly independent of the surface temperature of the billets up to 150℃. However, the temperature should have been limited below 60℃ for an effective fixing of gathered magnetic particles to the billet surface using methylene chloride. We also found that the amount of applied magnetic particles tremendously affected the detection capability.

청각장애인의 유산소성 운동프로그램 참여가 체성분 구성에 미치는 영향

이의수 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

The purpose of this study is to find the effect of aerobic exercise program on body composition of students with hearing-impaired students and its research was carried out for 12 weeks and analyzed the body composition of before and after the program. The results are as follows: 1. After 12 weeks of aerobic exercise pr1Jam percent body at was before the program 20.164.79% and after, 16.733.89%, thus showing statistically significant decrease in body at (p<.05). 2. After 12 weeps of aerobic exercise program mass body at was before the program 13.204.04kg, and after, 10.613.09kg, thus showing statistically significant decrease of 2.59 kg, mass body fat. 3. After 12. weeks of aerobic exercise program total body water was before the program 29.050.781 and after. 29.92.1.611, showing statistically insignificant increase of 0.871. 4. After 12 weeks of aerobic exercise program non-fat body weight was before the program 52.432.23kg and after, 52.762.114kg, showing statistically insignificant slight increase. 5. After 12 weeks of aerobic exercise program body weight was before the program 65.533.135kg and after. 63.373.135, thus showing statistically significant decrease of 2.26kg(p<.05). 6. After 1a weeks of aerobic exercise program BMI was before the program. 22.641.45 kg/m² and after, 21.851.33kg/m², thus indicating statistical significance. Asthe above results show, an aerobic exercise program significanty benefits hearing-impaired students in reduction of body fat and by increasing non-fat essentials such as a potassium, calcium. magnesium, etc, which are crucial for the muscle. We, therefore, fimly conclude that the aerobic exercise is an efficient exercise program for the students

쌍정 경계가 고온 초전도체 Y₁Ba₂Cu₃O단결정의 자기적특성에 미치는 영향

이보화,박정수,김채옥,김의훈,정규채 漢陽大學校 自然科學硏究所 1997 自然科學論文集 Vol.16 No.-

일반적으로 쌍정 경계(twin boundary)는 고온초전도체Y₁Ba₂Cu₃O??? 단결정 내에서 핀 고정점(pinning center)로 작용하여 단결정 시료의 자화에 영향을 미칠 것으로 알려져 왔다. 그러나 이에 대한 체계적인 실험적 연구가 수행되지 않고 있다. 본 실험에서는 Y₁Ba₂Cu₃O??? 단결정 시료를 성장시킨 후, 재 후열처리 과정 중에 단축 가압 방법(uniaxial stress method)을 이용하여 단결정 시료를 detwinning 하였다. 편광효과가 관측된 micro-Raman spectra와 X-ray 회절 패턴으로부터 관측된 (001)면의 주 피크의 2Θ 값을 통해서 단결정이 잘 성장되었음을 확인하였다. 그리고, 반자성 차폐 효과, 마이스너 효과 및 자기이력 측정 결과로부터 detwinning시간이 길어져서 쌍정 경계의 비율이 감소할수록 자화폭이 감소함을 관측하였다. 이로부터 자속 고정(flux pinning)이 줄어듦을 알 수 있었다. 그러므로 쌍정 경계가 고온초전도체 Y₁Ba₂Cu₃O??? 단결정의 핀 고정점으로 작용한다는 것을 알 수 있었다. Generally it is suggested that twin boundaries play the major role of the pinning center in high-Tc superconductor Y₁Ba₂Cu₃???? single crystal and influences the magnetization. However, any systematic experiment related with this expectation has not been performed yet. In this experiment, after growing Y₁Ba₂Cu₃??? single crystals, we detwinned them in oxygen atmosphere using uniaxial stress method while annealing them again. It was verified that single crystals had been grown well from micro-Raman spectra that showed the polarization effect and 2Θ values of (001) plain peaks in X-ray diffraction pattern. We observed that values of magnetization of samples decreased from antimagnetic shield effects, Meissner effect and magnetic hysteresis as detwinning time was increased and this result means that flux pinning decreases. As a result we confirmed that twin boundaries act as a pinning center in high-Tc superconductor Y₁Ba₂Cu₃??? single crystal.

인터넷 공간데이타 전자유통 시스템에 관한 연구 : A Study on the Internet Spatial Data Electronic Distribution System

이기영,서의석,이용수 韓國컴퓨터情報學會 2000 韓國컴퓨터情報學會論文誌 Vol.5 No.3

최근에 WWW의 등장과 함께 인터넷 사용자가 폭발적으로 증가하고 웹 지리정보시스템의 필요성과 중요성이 크게 대두되어 인터넷을 통한 공간데이타 유통 환경을 구축하기 위하여 여러 기관 등에서 많은 기술개발 연구가 이루어지고 있다. 공간데이타를 인터넷상에서 접근하기 위해서는 WWW상에 공간데이타를 등록하고 필요로 하는 사람에게 판매할 수 있는 공간데이타 전자유통 시스템이 필요하다. 본 논문에서는 WWW과 연동하는 공간데이타 전자유통 시스템을 구축하기 위한 효율적인 공간데이타 전주유통시스템의 모델을 설계하고 제시한다. 또한 시스템의 각 모듈에 대한 기능과 구현 방법을 제안한다. Recently, the advent of WWW increased the population of internet users and many institutions are carrying out technical development research to implement spatial data distribution environment via internet because importance of Web Geographic Information System(WGIS) is being increased highly. To be accessed WGIS data. we need Spatial Data Electronic Distribution System(SDEDS) which registers and sell spatial data in WWW. In this paper. we propose and design effective SDEDS to expel spatial data electronic distribution system which is connected WWW. Therefore. we show how to implement and functions of each module.

외부광궤환에 의한 레이저 다이오드의 출력특성

이세영,오차환,김필수,황의중 漢陽大學校 自然科學硏究所 1997 自然科學論文集 Vol.16 No.-

외부 광궤환 반도체 레이저의 출력 특성을 비율방정식의 수치해를 이용하여 분석하였다. 출력의 세기와 위상과 전자밀도를 시간에 대한 함수로 알아보았다. 또한 bifurcation diagram과 phase diagram을 통하여 궤환비율 k에 따른 레이저의 동작 특성을 조사하였다. 궤환광이 없을때는 이완발진이 감쇄한 후 안정한 출력특성이 나타나지만 되먹임 비율이 증가하면서 안정한 해의 갯수가 증가하다가 ??????이상의 매우 강한 광궤환에서는 출력특성이 극도로 불규칙해지고 무수히 많은 해를 갖는 혼돈현상이 나타남을 알 수 있었다. The output characteristics of a laser diode with external optical feedback were analyzed by numerical solutions of rate equations. The output power, phase and carrier density were plotted as a function of time. Dynamics of external cavity laser were investigated by the bifurcation diagram and the phase diagram with respect to the feedback rate k. If there was no feedback, relaxation oscillation reduced and laser showed stable output. For increasing feed back level, the number of stable state was increased. In very strong feedback rate above ??????, laser output showed extremely unstable and chaotic behavior.

유산소운동이 정신장애인의 신체조성, 체력, 폐활량에 미치는 영향

이석인,이의수 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

The purpose of this study is to find out what effects aerobic exercise has on the body formation and physical strength of people suffering from schizophrenia, [n order to do so, we conducted an experiment, in which we selected seven men and seven women from the thirties to sixties who were diagnosed with schizophrenia by their physicians in S mental hospital in Seoul, Afterward, we had those people do aerobic exercise and analyzed the change in body formation, physical strength, and breathing capacity, Followings are the result of our experiment. 1. Although there was a slight decline in Body Mass Index (BMI) of both the group of men and women, it was not a significant difference statistically. On the other hand, there was a statistically significant change in the density of body and the account of body fat of both the group of men and women(p<.05). 2. There was a slight increase in abdominal muscle power of both the group of men and women, which was not a statistically significant difference. As for Trunk Flexion that indicates flexibility, the group of women showed a significant increase (p<.05), whereas the group of men did not show a significant difference, although there was a slight increase, Concerning Whole Body Response that indicates agility, both men and women showed a significant increase(p<.05). 3. Considering Functional Vital Capacity (FVC), while the group of women showed a significant increase (p<.05), the group of mere did not show a statistically significant difference despite a slight increase, There was a significant increase in %FVC of both men and women (p<.05), and regarding Forced Expiratory Volume (FEV1.0), there was a slight increase of both the group of men and women, which was statistically not a significant change.

단결정 Si(111) 위에 형성된 Ti-실리사이드에 대한 RBS 및 XRD 분석

이중환,권오준,최치규,박동수,김건호,이상환,이의완,곽호원 濟州大學校 基礎科學硏究所 1991 基礎科學硏究 Vol.4 No.1

초고진공 상태에서 p형 Si(111)기판에 Ti을 증착한 후 고진공에서 열처리하여 Ti-실리사이드를 형성시켰으며, Ti-실리사이드의 상전이 및 형성운동학은 2 MeV⁴He? 이온 후방산란과 x-선 회절방법으로 규명하였다. 형성된 TiSi₂는 결정학적으로 C49(ZrSi₂)와 C54 구조의 두 종류로 확인되었다. C49 TiSi₂상은 열처리온도가 700℃이하의 저온에서 형성되었고, 700℃ 이상의 고온에서는 C54 TiSi₂상으로 나타났다. 본 연구에서 확인된 C54 TiSi₂전이온도(??)는 700℃ 였고, TiSi₂형성온도 영역내에서 TiSi₂ 층두께(χ)와 열처리시간(t)의 관계는 저온(700℃ 이하)일 경우 ??이고, 고온(750℃ 이상)에서는 χ=ct+d 의 관계식이 만족됨을 알 수 있었다. 이것은 700℃ 이하에서 TiSi₂ 형성기구가 Si 확산에 의해 제어되며, 750℃ 이상에서는 핵형성 제어에 의하여 계면반응하는 것으로 나타났다. Titanium silicides were prepared by depositing titanium film on p-type Si(111) followed by annealing in ultra high vacuum. The growth kinetics of Ti-silicide has been studied by using ion backscattering spectrometry and x-ray diffractometry. Two crystallographic structures of Ti-silicide were identified the (ZrSi₂)structure and C54. The C49 TiSi₂ phase was formed at low annealing temperature(<700℃),and it transformed to the C54 phase over 700℃. The relation between the thickness of TiSi₂ layer(χ) and the annealing time(t) was ?? when annealing temperature was under 700℃ and χ=ct+d when that was over 750℃. The former implied that the formation of TiSi₂ was controlled by diffusion and the latter by nucleation of at the Ti/Si(111) interface.