Tulipa gesneriana의 組織培養에 關한 硏究 : Ⅰ. Callus 誘起에 미치는 2,4-D와 Kinetin의 效果 Ⅰ. Effects of 2,4-D and Kinetin on the callus induction

李炳基,朴鶴封,宋鎭水 全北大學校 1984 論文集 Vol.26 No.-

Effects of 2,4-dichlorophenoxyacetic acid(2,4-D) and kinetin on the induction and growth of calluses of Tulipa gesneriana cv. Golden Apeldoorn were investigated in vitro. Style tissues were cultured on Murashige and Skoog's media containing various levels of 2, 4-D and kinein. The calluses were induced vigorously from the medium supplemented with 1-2mg/ι 2,4-d and 0.5-lmg/ι kinetin, Espcially, the friable calluses like protuberance were formed from the medium containing 2mg/ι 2,4-D and 1mg/ι kinetin. The poor calluses were initiated from the medium supplemented with 1mg/ι 2,4-D or 1mg/ι kinetin only.

중연계 무선네트워크 환경의 도로유지관리계측 시스템 개발에 관한 연구

이상우,송종걸,남왕현,김학수 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A

Wireless Sensor Networks provide a new paradigm for sensing and disseminating information from various environments, with the potential to serve many and diverse applications. Recent advancement in wireless communications and electronics has enabled the development of low-cost sensor networks. The sensor networks can be used for various application areas. For different application areas, there are different technical issues that researchers are currently resolving. The current state of the art of sensor networks is captured in this article, where solutions are discussed under their related protocol stack layer sections. This article also points out the open research issues and intends to spark new interests and developments in this field. In order to evaluate the application of field monitoring system, lab tests, field test and FEM analysis are conducted. Therefore the accuracy of RFID wireless sensor data is verified.

중연계 무선네트워크 환경의 도로유지관리계측 시스템 개발에 관한 연구

이상우,송종결,남왕현,김학수 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B

Wireless Sensor Networks provide a new paradigm for sensing and disseminating information from various environments, with the potential to serve many and diverse applications. Recent advancement in wireless communications and electronics has enabled the development of low-cost sensor networks. The sensor networks can be used for various application areas. For different application areas, there are different technical issues that researchers are currently resolving. The current state of the art of sensor networks is captured in this article, where solutions are discussed under their related protocol stack layer sections. This article also points out the open research issues and intends to spark new interests and developments in this field. In order to evaluate the application of field monitoring system, lab tests field and FEM analysis are conducted. Therefore the accuracy of RFID wireless sensor data is verified.

흉추의 병적골절을 보인 심한 신성 골이영양증 1례 : 증례 보고

이송주,이은미,임학,정연순,장재호 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.4

A 33-year-old woman presented with tingling sensation and weakness in the both hands and feet. She had a diagnosis of secondary hyperparathyroidism caused by renal failure. Her height was shortened due to severe kyphosis. On plain radiograph, there were fractures on both femoral necks and pathologic fracture on thoracic vertebra. An MRI scan of the spine demonstrated a expansile, heterogeneous hypointense lesion of the 2nd thoracic spine, which remained hypointense on T2 images. Following total parathyroidectomy the patient underwent a thoracic decompression and spinal stabilization from the back. Hyperparathyroidism may cause brown tumor and tumor associated pathologic fracture in the spine. Involvement of the spine with neural compression is extremely rare. An early spinal decompression with parathyroidectomy leads to remission of symptoms.

하나로에서의 NTD 조사를 위한 중성자속 평탄화 장치의 최적화를 위한 예비분석

송영동,이헌주,이병택,전병진,김학노 濟州大學校 産業技術硏究所 2001 산업기술연구소논문집 Vol.12 No.1

NTD (Pieutron Transmutation Doping) method has several advantages of high resistivity and uniform doping in comparison with other method. To satisfy those conditions. the flux variations of radial and axial directions should be within ±5 % and ±1.7%. respectively. The NTD facility in HANARO is purposed to irradiate the silicon ingot of 60cm in height. Hence. the flux flattener will be designed for 60cm. In this paper. preliminary study for optimal design is showed and the flux distribution of axial direction is calculated using MCNP4B code. The results show that the flattener model can flatten the flux to 83% of total length.

하나로에서의 NTD조사를 위한 중성자속 평탄화 장치의 최적화를 위한 예비분석

송영동,이헌주,이병철,전병진,김학노 제주대학교 산업기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.1

NTD(Neutron Transmutation Doping) method has several advantages of high resistivity and uniform doping in comparison with other method. To satisfy those conditions, the flux variations of radial and axial directions should be within ±5% and ±1.7%. respectively. The NTD facility in HANARO is purposed to irradiate the silicon ingot of 60cm in height. Hence, the flux flattener will be designed for 60cm. In this paper, preliminary study for optimal design is showed and the flux distribution of axial direction is calculated using MCNP4B code. The results show that the flattener model can flatten the flux to 83% of total length.

Effects of the prey refuge distribution on a predator-prey system

Lee, Sang-Hee,Kwon, Ohsung,Song, Hark-Soo 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.

<P>The existence of prey refuges in a predator-prey system is known to be strongly related to the ecosystem's stability. In this study, we explored how the prey refuge distribution affects the predator-prey system. To do so, we constructed a spatial lattice model to simulate an integrative predator (wolf) - prey (rabbit) - plant (grass) relationship. When a wolf (rabbit) encountered a rabbit (grass), the wolf (rabbit) tended to move to the rabbit (grass) for foraging while the rabbit tended to escape from the wolf. These behaviors were mathematically described by the degrees of willingness for hunting (H) and escaping (E). Initially, n refuges for prey were heterogeneously distributed in the lattice space. The heterogeneity was characterized as variable A. Higher values of A equate to higher aggregation in the refuge. We investigated the mean population density for different values of H, E, and A. To simply characterize the refuge distribution effect, we built an H-E grid map containing the population density for each species. Then, we counted the number of grids, N, with a population density a parts per thousand yen 0.25. Simulation results showed that an appropriate value of A positively affected prey survival while values of A were too high had a negative effect on prey survival. The results were explained by using the trade-off between the staying time of the prey in the refuge and the cluster size of the refuge.</P>

지형구조와 나무밀도가 산불패턴에 미치는 영향

송학수 ( Hark Soo Song ),권오성 ( Oh Sung Kwon ),이상희 ( Sang Hee Lee ) 한국농림기상학회 2014 한국농림기상학회지 Vol.16 No.4

Understanding the forest fire patterns is necessary to comprehend the stability of the forest ecosystems. Thus, researchers have suggested the simulation models to mimic the forest fire spread dynamics, which enables us to predict the forest damage in the scenarios that are difficult to be experimentally tested in laboratory scale. However, many of the models have the limitation that many of them did not consider the complicated environmental factors, such as fuel types, wind, and moisture. In this study, we suggested a simple model with the factors, especially, the geomorphological structure of the forest and two types of fuel. The two fuels correspond to susceptible tree and resistant tree with different probabilities of transferring fire. The trees were randomly distributed in simulation space at densities ranging from 0.5 (low) to 1.0 (high). The susceptible tree had higher value of the probability than the resistant tree. Based on the number of burnt trees, we then carried out the sensitivity analysis to quantify how the forest fire patterns are affected by the structure and tree density. We believe that our model can be a useful tool to explore forest fire spreading patterns.

산불확산에 영향을 미치는 생태학적 요소들간의 민감도 분석; 시뮬레이션 연구

송학수 ( Hark Soo Song ),이상희 ( Sang Hee Lee ) 한국농림기상학회 2013 한국농림기상학회지 Vol.15 No.3

산불은 대표적인 산림생태계의 재해 중 하나로 최근, 우리나라에서도 빈번하게 발생하고 있으며, 일반적으로 광범위한 지역에 빠른 속도로 확산되는 특징을 가지고 있다. 바람 및 나무의 종류, 다양한 지형 요소들이 산불 발생 시 급진적 확산에 영향을 주는 요소들이다. 산불의 빠른 확산은 생태계 교란 및 재산 피해, 인명 피해 등을 야기 시킨다. 이러한 이유로, 최근 산불에 관련된 연구가 활발하게 진행되고 있다. 본 연구에서는 바람 요인이 고려된 산불 패턴 가상 시뮬레이션 단순 모델을 제안하였고, 셀룰라오토마타(Cellular Automata)의 격자 기반으로 구성 되었다. 모델의 시뮬레이션을 통하여, 바람의 세기 변화, 주어진 공간에 분포해 있는 나무 전체의 밀도, 그리고, 나무들 가운데 가연성이 높은 나무의 밀도가 산불확산에 미치는 영향을 조사하였다. 민감도 분석 결과, 전체 나무 밀도가 세 가지 요소 중 산불확산에 가장 민감하게 기여하였으며, 그 다음으로는 바람의 영향, 마지막으로 가연성이 높은 나무의 밀도 순으로 나타났다. 본 연구에서 제안한 산불확산 시뮬레이션 모델 및 분석 결과는 실제 산불 확산 및 억제 전략 수립에 활용되어 질 수 있을 것으로 여겨지며, 아울러 좀 더 현실적인 생태학적 요소들을 모델에 고려함으로써 산불확산 예측 연구에도 이용되어 질 수 있을 것으로 판단된다. Forest fires are expected to increase in severity and frequency under global climate change and thus better understanding of fire dynamics is critical for mitigation and adaptation. Researchers with different background, such as ecologists, physicists, and mathematical biologists, have developed various simulation models to reproduce forest fire spread dynamics. However, these models have limitations in the fire spreading because of the complicated factors such as fuel types, wind, and moisture. In this study, we suggested a simple model considering the wind effect and two different fuel types. The two fuels correspond to susceptible tree and resistant tree with different probabilities of transferring fire. The trees were randomly distributed in simulation space with a density ranging from 0.0 (low) to 1.0 (high). The susceptible tree had higher value of the probability than the resistant tree. Based on the number of burnt trees, we then carried out the sensitivity analysis to quantify how the forest fire patterns are affected by wind and tree density. The statistical analysis showed that the total tree density had greatest effect on the forest fire spreading and wind had the next greatest effect. The density of the susceptible tree was relatively lower factor affecting the forest fire. We believe that our model can be a useful tool to explore forest fire spreading patterns.

Effects of the Various Culture Media and the Amount of Irrigation on Flowering in Dicentra spectabilis Lem

Jin-Jae Lee,Jong-Seon Eun,Song-Yong Jin,Hark-Bong Bark 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-