본 논문에서는 IFS(iterated function system) 프랙탈에서 점의 코드를 활용한 변형의 개선 방법을 고려한다. 기존의 변형방법에서는 부분적 변형이 랜덤 반복에 의해 임의로 전파되므로 대개 단조로운 느낌을 주는 모양이 나타나고 있다. 이러한 점을 개선하기 위하여 코드를 활용 하여 맵의 선택을 제어하는 방법을 제안한다. 제안된 방법을 적용한 결과 프랙탈의 모양 특성 이 적절히 반영된 흥미로운 변형을 얻을 수 있었다. 또한 코드에 따라 변화하는 상태변수를 도 입하여 좌표의 변환 외의 다른 속성의 변형을 손쉽게 구현하는 방법도 제안한다.

The influence of seed maturity, stratification, and seed washing method on seed germination were investigated for establishment of seed propagation system in dropwort (Oenanthe stolonifera DC). Seed germination rate was increased as period of the seed ripening increased, especially the seed over 40 days after flowering showed the highest germination rate. The optimum period of cold stratification treatment to promote seed germination was about 8 weeks. The seed treated by a cold wet stratification with sand exhibited higher germination rate compared to the seed treated by a cold wet stratification without sand. The stratified seeds that were stored in the ground having fluctuating temperature were improved up to 19%, while stratification stored under constant temperature(4℃) did not improve germination rate. In addition, 8 weeks of stratification period under fluctuating temperature in the ground was most effective. Sodium hypochlorite, vital oxide, and distilled water were used as chemicals to remove the germination inhibitor of seed coat. Water washing of seed coat after soaking in 0.5% sodium hypochlorite and 0.0005% vital oxide for three minutes and 60 minutes respectively could effectively remove the germination inhibitors in the seed coat.

본 연구는 제주특산식물인 좀향유의 현지 내･외 보존을 위한 기초 연구로서 증식체계를 마련하고 전처리제 처리에 따른 발 근 특성과 시비에 따른 유묘의 생장 효과를 등을 알아보았다. 온 실과 밀폐상의 온습도 조사결과 평균 온도는 비슷하였으나 공 중 습도는 온실보다 밀폐상이 높은 습도를 유지하였으며, 좀향 유 삽목 후 온실은 10일, 밀폐상은 7일만에 최초 발근을 확인하 여 밀폐상의 빠른 발근율을 보였으며 온실과 밀폐상에서의 생 존율, 발근율, 뿌리수 등은 근소하게 밀폐상이 높게 조사되어 온실보다 밀폐상이 효과적이었다. 발근억제물질 제거를 위한 전 처리제 처리는 AgNO3 77.5%를 제외한 다른 처리구에서 95% 이 상의 높은 발근율로 조사되어 좀향유의 경우 발근억제 물질은 적은 것으로 판단된다. 유묘의 용기별 질소 시비량 및 Osmocote 시비시험 결과 시비량과 용기의 조건에 따라 생존율과 생장 등 에 차이를 보였다. 배양판에서 완효성 비료인 Osmocote를 시비 한 결과 생존율, 지상부, 지하부 생장 등이 가장 양호하여 좀향 유의 유묘 증식을 위해서는 Osmocote 시비가 바람직 할 것으로 판단된다.

This experiment was carried out to establish the optimum cutting time, plant growth regulator, and bed-soilfor rooting by greenwood cutting of Schisandra chinensis. Approximately 7㎝ long-shoots of greenwood cuttings weretransplanted by various cutting times, plant growth regulators, and bed-soils in the plastic-film house. The rooting rate ofgreenwood cutting was 12.5% in the April 5th, 73.5% in the May 8th, and 75.5% in the August 5th. The number and lengthof primary root in greenwood cutting were more in the early May than those in the early August. For mass propagation ofSchisandra chinensis. using greenwood cutting, shoots were treated with plant growth regulators on May to increase rootingrate. Rooting rate was 100% with IAA 50㎎/ℓ,92.9% with NAA 100㎎/ℓ,and NAA 1,000㎎/ℓ,for 60 min. To selecteffective media for rooting, various medias for bed-soil were treated by single and mixture form for 100 days after cutting.Rooting rate was 91.8% in the single treatment of peat moss or decomposition of granite soil, and this result was better thanthose in other treatment. The treatment by 1:1 mixture of peat moss and horticulture bed soil was rooting with 94.0% bestrooting rate.

The Earth is not perfectly spherical and its rotational axis is not fixed in space, and these geophysical and kinematic irregularities work as dominant perturbations in satellite orbit propagation. The International Earth Rotation Service (IERS) provides the Conventions as guidelines for using the Earth’s model and the reference time and coordinate systems defined by the International Astronomical Union (IAU). These guidelines are directly applied to model orbital dynamics of Earth satellites. In the present work, the effects of the latest conventions released in 2010 on orbit propagation are investigated by comparison with cases of applying the previous guidelines, IERS Conventions (2003). All seven major updates are tested, i.e., for the models of the precession/nutation, the geopotential, the ocean tides, the ocean pole tides, the free core nutation, the polar motion, and the solar system ephemeris. The resultant position differences for one week of orbit propagation range from tens of meters for the geopotential model change from EGM96 to EGM2008 to a few mm for the precession/nutation model change from IAU2000 to IAU2006. The along-track differences vary secularly while the cross-track components show periodic variation. However, the radial-track position differences are very small compared with the other components in all cases. These phenomena reflect the variation of the ascending node and the argument of latitude. The reason is that the changed models tested in the current study can be regarded as small fluctuations of the geopotential model from the point of view of orbital dynamics. The ascending node and the argument of latitude are more sensitive to the geopotential than the other elements. This study contributes to understanding of the relation between the Earth’s geophysical properties and orbital motion of satellites as well as satellite-based observations.

연안해역의 산재해 있는 해안송림이나 삼림성 식생은 평상시에는 자연 경관과 인근 연안 환경에 편익을 제공하고 있으며, 지진해일이나 폭풍해일 등의 장주기파랑 내습시에는 입사파 에너지를 감쇠하여 배후지의 연안재해를 억제하여 연안 환경 및 방재의 측면에서 주목을 받고 있다. 특히 2004년 동남아시아에서 발생한 지진해일의 재해가 삼림성 식생인 맹그로브 군락지(Mangrove forest)에서 최소화 되었다는 조사․보고에 따라 연안방재의 측면에서 해안림의 가치가 재조명되고 있다. 해안림과 같은 삼림성 식물이 폭풍 및 지진해일 등과 같은 파랑의 에너지 감쇠와 이에 따른 연안방재능력을 보이는 것은 해안림의 수목 형상 등에 의한 것으로 알려져 있으나, 해안림을 구성하고 있는 삼림성 식물군락을 구성하고 있는 잎, 가지, 줄기로 복잡한 수목형상이 어떻게 내습하는 파동을 전파 변형, 감쇠해 가는가에 대해서는 아직은 잘 알려져 있지 않다. 본 연구에서는 삼림성 해안림으로 전파하는 입사파 및 폭풍해일에 대한 유체 저항을 본 수치 해석에 모델화하여 적용하는 것을 목적으로 해안림의 형상 특성을 현지 조사하였다. 그리고, 해안림을 상층부와 하층부로 2개층으로 구성된 투과성 구조물로 모형화 하여, 해안림을 통과하는 파랑의 감쇠 특성을 CADMUS-SURF 수치모형을 통해 검토하였다.

본 연구에서는 3차원 수치모형(ANSYS CFX model)을 이용하여 수조 내 다공성 구조물을 통과하는 댐 붕괴파의 전파특성에 대한 수치적 분석을 수행하였다. 다공성 구조물 내 및 주위에서의 수심분포에 대한 기존의 측정된 결과와 모의된 결과를 비교한 결과 비교적 잘 일치하는 것으로 나타났다. 또한 수조 내에 다공성 구조물이 부분적으로 존재하고 있을 경우에 대한 3차원 흐름구조를 수치적으로 분석하였다. 전반적으로 다공성 구조물이 존재하는 영역에 비해 존재하 지 않은 영역에서 수심의 급격한 변동이 보다 크게 나타났으며, 따라서 다공성 구조물은 수심의 급격한 변동을 감소시키는 역할을 하는 것으로 나타났다.

Somatic embryogenesis is a process where a plant or embryo is derived from a single somatic cell or group of somatic cells. Application of this process include: clonal propagation of genetically uniform plant material; elimination of viruses; provision if source tissue for genetic transformation; generation of whole plants from single cells called protoplasts; development of synthetic seed technology. In this study tissue culture was carried out for mass propagation of cassava using somatic embryogenesis. For tissue culture set up, we used cassava variety (“Rayong5”, “Rayong7”, “Rayong9”, “Rayong11”) developed in Rayong Field Crop Research Center(RYFCRC). In induction of callus step, the callus formed from each cassava variety. “Rayong 7“ showed the highest induction rate of 95%, while induction rate of other varies were ranged from 50% to 85%. In the case of weight of callus ”Rayong5“ has the highest weight. Results in the present study would be useful in mass propagation of cassava by somatic embryogenesis.

본 연구는 바이러스 무병묘의 대량 증식을 위한 기초 자료를 얻고자 포도 '자랑' 품종의 신초와 뿌리의 형성 및 생장에 미치는 배지조성물질과 생장조절제의 영향을 구명하고자 수행되었다. 배지의 무기염 농도가 낮을수록 신초의 형성은 많아지는 경향으로, 특히 1/2MS배지에서 신초의 형성 및 생장이 가장 양호하였다. 부정근의 형성은 무기염의 농도가 높아질수록 양호하여 2MS배지에서 부정근의 수가 2.1개로 가장 많았다. Sucrose의 경우, 신초의 형성은 1%, 부정근의 형성은 3%, 생장은 1% 농도구에서 가장 좋았다. 활성탄의 0.05% 첨가에 의해 신초의 생장은 양호했으며, 특히, 부정근의 형성 및 생장에 효과적이었다. '자랑'의 대량 증식을 위한 배지의 pH는 6.8이 가장 적합하여 신초의 마디수와 길이가 각각 3.9개와 1.3 cm로 가장 좋았다. 기내 대량증식에 미치는 생장조절제의 영향으로 BA 1.0 mg/L에서 신초의 생장이 가장 왕성하였으며, NAA 1.0 mg/L에서 절편체당 16.9개의 신초가 형성되어 양호한 결과를 얻었다.

This study investigates wave propagation characteristics when guided waves propagate in a waveguide surrounded by non-homogeneous media. Assuming that the medium consists of same size elements, the acoustic properties of each element were determined using SWFEM method. The boundary conditions of each element and the waveguide were determined by random number.

Up to recently at the modern education in Namyang the christian education’s influence before 1905 has not particularly received attention. But according to Shin Hak Wol Bo, the Namyang Church was founded in 1900 and in 1902 nine churches were established around Namyang. From the time in which the churches were founded, the schools of the boys and the schools of the girls for the modern education were built. The schools of boys were Boheung elementary school and Powell school and the school of girls was Jeha elementary school and the nine day schools of boys and girls were built in the nine churches. Teachers of these schools were Lee Chang Heoi and An Elizabeth. They taught the Hangul and arithmetic. Particularly after the girls and women were participated in the Bible Class, they grew into the women leader of church and the modern education patron. After 1905’s Protectorate Treaty nineteen schools were founded. Among these schools, three schools such as Boheung girl school, Bosung elementary school, and Bomyung elementary school were set up by christians and church. Many christians such as Lee Chang Hoi, Choi Sung Dae, Kim Hyeun Jun were participating in the establishment of Sangdong elementary school, Yangsung school, Songlim school, and Junkok Private House. Moreover Boheung school was the center of many schools and held the union sport and inspired the patriotism and the military spirit. And Boheung school and Boheung girl school with YangSung school established the ordinary course and the higher course and led the middle education. These two schools with the public elementary school joined the National Debt Compensation Campaign. The Namyang branch of Daehan-Jaganghoi was set up by the leadership of christians such as Lee Chang Hoi. Christians such as Kim Hee Kyung and Kim Hyeui Kyung and An Maria founded the EuiSungHoi and they participated in the National Debt Compensation Campaign. They established Women Education Society and gave the positive support for the women education. On the contrary Buddism and the Cheondogyo did not establish even a modern school. When we observe from this side Christianity led the modern education and the patriotic enlightenment movement in Namyang quantitatively as well as qualitatively. Christians such as Hong Sung Ha and Lee Chang Hoi among Namyang church exhorters and SeoYeuDa Myeon Head Choi Sung Dae, Kim Kwan Hyeon as Kim Hong Su’s son and An Elizabeth got into the positive act in the patriotic enlightenment movement with country governors such as Jang Ho Jin, Bang Han Duck, and the enlightened confucian scholars.

This study was conducted to examine effects of plant growth regulators and light resources on the formation of multiple shoot and plant regeneration of Hovenia dulcis var. koreana Nakai. Stem and shoot tip were cultured on MS medium or WPM supplemented with various plant growth regulators. At the single treatment, the highest shoot formation was obtained when stem explants were cultured on WPM supplemented with kinetin 1.0mg·L-1. MS medium containing NAA 0.1 and TDZ 0.1mg·L-1 gave the best results for shoot induction rate and shoot growth in combination treatments. Of the BAP and kinetin tested, BAP 0.5mg·L-1 on WPM was found to be more effective for shoot growth from shoot tip. Under white fluorescent light treatment, shoot growth was much higher than blue, red LED treatments. Root induction from in vitro growth of plantlet was the best on WPM supplemented with 1.0mg·L-1 IBA. The results suggest that selection of plant growth regulators and light resources could be important factor to achieve an efficient in vitro growth.

고감미 다수성 계통인 자가수정 스테비아의 hypocotyl 절편체를 이용하여 대량증식방법 개발에 대한 결과는 다음과 같다. 선발된 자가수정개체는 초장이 72.0~120.7 cm로 분포되어 있었고, 분지수는 4.9~56.6개로 분포되어 있었다. HPLC 분석을 통하여 rebaudioside-A(RA)성분이 평균함량 55.2%이상 함유된 자가수정 개체를 선발하였다. 스테비아의 hypocotyl 절편체를 이용하여 MS배지에 1.5 mg/L BA와 0.5 mg