Glass Ionomer Cement의 邊綠漏出에 關한 實驗的 硏究

朱光燮,柳根元 大韓齒科保存學會 1981 Restorative Dentistry & Endodontics Vol.7 No.1

시신경 유두를 침범한 급성 임파구성 백혈병 : 1예 보고 Report of One Case

김태운,이건수,이철민,심완섭 충남대학교 의과대학 지역사회의학연구소 1981 충남의대잡지 Vol.8 No.1

A ten-year-old boy with acute lymphoblastic leukemia, probably T-cell type, who had received intrathecal methotrexate for theprophylaxis of meningeal leukemia, acquired impaired vision during maintenance chemotherapy. Ophthalmologic examinations disclosed a leukemic infiltration of right optic disc. It was followed by meningeal leukemia and systemic relapse successively within 2 months. The response of the ocular lesion to systemic chemotherapy was good.

뇌성마비 지체장애 아동을 위한 대체의사소통기기 설계, 제작 및 중재

김창걸,이근민,송병섭 대구대학교 특수교육재활과학연구소 2005 再活科學硏究 Vol.23 No.2

For the handicapped person who is in a difficulty of speech communication by cerebral palsy(CP), an augmentative and assistive communication (AAC) equipment was designed, implemented and applied. The AAC equipment was designed to generate recoded voice that is matched to the pressed word plate. A handicapped person by CP have been selected and after investigation of her disabled condition, the equipment was considered to be put on the knee of user who have to sit at a wheelchair. For the low power consumption, a PIC16F84 micro controller was used in the control module of the AAC and an IC record & play kit was used for the voice recording and generating the sound. The implemented equipment was tested by the selected disabled and it was verified that the AAC equipment have suitable performances as designed concept. 뇌성마비로 인하여 의사소통이 힘든 아동이 자신의 의사를 표현할 수 있도록 도와주기 위하여 원하는 단어판을 누를 경우 해당하는 음성을 소리로 발생시킴으로써 대화가 가능하도록 하는 대체의사소통기구를 설계, 제작하였다. 선정된 대상아동의 장애상태를 확인한 후 사용할 수 있는 왼쪽 손을 이용하여 포인팅 함으로써 자신의 의사를 전달할 수 있도록 하였으며, 발생하는 음성을 의미하는 그림이 그려진 단어판 스위치를 직접 입력할 수 있도록 함으로써 가정에서 원하는 대화를 가능하도록 설계하였다. 의사소통기기의 제어기는 PIC16F84를 이용하였고, 음성출력기는 20초 이내의 범위에서 직접 녹음할 수 있으며 저전력으로 동작하는 집적회로를 이용한 음성 녹음 및 출력기를 사용하였다. 기기제작 후 대상아동에게 사용함으로써 설계된 계획에 맞도록 의사소통기기가 양호하게 동작함을 확인하였다. 앞으로 이러한 기기의 성능개선을 실시할 경우 현재 외국에서 수입되고 있는 값비싼 의사소통기기를 대체할 수 있는 가능성을 확인하였다.

유기성 폐기물과 알칼리 안정화제가 첨가된 연안 양식장 퇴적물 조비료의 영양성분 조성

김정배,강창근,이근섭,박정임,이필용 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12

To utilize coastal aquaculture ground bottom sediment in which concentrations of harmful pollutants are low and organic content is high as an organic fertilizer alkaline stabilizers such as CaO, Oyster shell, Mg(OH)_2 were added to the bottom sediment organic additives of livestock or food wastes. Nutritive qualities of crude fertilizers were measured to examine effects of alkaline stabilizers and organic waste additions. The Mg(OH)_2-added crude fertilizer had significantly lower total carbon(T-C) and nitrogen(T-N) content, reflecting the dilution effect due to great amount of Mg(OH)_2 addition. However, the addition of oyster shell had no significant effect on the T-C and T-N content of the fertilizer. P_2O_5 and K_2O content was considerably higher in the mixed of aquaculture ground bottom sediment and livestock wastes than in the mixture of the sediments and food wastes, resulting from higher P_2O_5 and K_2O content in livestock wastes. Addition of Mg(OH)_2 increased the content of MgO in the crude fertilizer but significantly reduced the content of other nutritive elements such as P_2O_5, K_2O and CaO. Addition of oyster shell as an alkaline stabilizer seemed to have the advantage of saving time and expenses for dryness due to role as a modulator of water content. Moreover, additions of effect Mg(OH)_2 decreased the concentrations of heavy metals in the fertilizer by the dilution while additions of oryster shell had no influence on heavy metal concentrations in the fertilizer.

Difference of Suaeda japonica Populations from two Different Habitats in Sorae, Incheon, Korea

Lee, Kun-Seop,Oh, Kye-Chil The Ecological Society of Korea 1989 Journal of Ecology and Environment Vol.12 No.3

The morphology and flowering time of two Suaeda japonica populations from different habitats, the creek and the bank of the mudflat in Sorae, were surveyed. And standard transplantation and reciprocal transplantation were carried out to determine whether their characteristics were genetically fixed or not. Also soil sample of these habitats were analyzed. The amounts of loss on ignition, maximum field capacity, total nitrogen, exchangeable calcium and potassium, and soluble phosphorus were found to be significantly different between two habitats. Leaf thickness, leaf width, leaf length, stem height number of branches, and number of seeds were significantly different between plants of two populations. And flowering times of two populations did not overlap. According to the results of transplantation, leaf width, leaf thickness, and flowering times were the same as those at their original habitat. But the stem lenght, leaf lenght, number of branches and unmber of seeds were not. Therefore, the differences in the leaf length, leaf thickness, and flowering time seemed to bo genetically fixed. It were suggested that the creek bank populations of Suaeda japoinica were to be considered as different ecotypes.

Production Ecology of the Seagrass Zostera marina in Jindong Bay, Korea

Lee, Kun-Seop,Park, Jung-Im,Chung, Ik-Kyo,Kang, Dong-Woo,Huh, Sung-Hoi The Korean Society of Phycology 2004 ALGAE Vol.19 No.1

Production dynamics of eelgrass, Zostera marina was examined in Jindong Bay on the south of the Korea peninsula. Eelgrass leaf productivities and environmental factors such as underwater photon flux density, water temperature, and nutrient availabilities in the water column and sediments were monitored from March 2002 to December 2003. While water temperature exhibited a distinct seasonal trend, underwater irradiance and nutrient availabilities exhibited high degree of fluctuation, and did not show a seasonal trend throughout the experimental periods. Eelgrass leaf elongation and production rates showed significant seasonal variations. Leaf productivity was highest in May (30.0 mg dry wt sht$^{-1}$ d$^{-1}$ or 3.7g dry wt m$^{-2}$d$^{-1}$) and lowest in November (3.2 mg dry wt sht$^{-1}$ d$^{-1}$ or 0.12 g dry wt m $^{-2}$ d$^{-1}$). Eelgrass leaf productivities did not show a strong correlation with underwater irradiance or environmental nutrient availabilities. The production rates, however, were positively correlated with water temperature during spring periods, and were correlated negatively at high water temperature exceeded 20℃ during summer months. While relative growth rates were highest in spring and lowest in high water temperature periods, plastochrone interval was longest during summer and shortest during spring. These results imply that seasonal growth dynamics of eelgrass, Z. marina was mainly controlled by water temperature.

Development of Indicator for Coastal and Estuarine Eutrophication Using Morphological Characteristics and Tissue N Content of Eelgrass, Zostera marina

Lee, Kun-Seop The Korean Society of Phycology 2004 ALGAE Vol.19 No.2

Since cultural eutrophication has the detrimental effects on estuarine and coastal ecosystems, recognition of early stage of nutrient over-enrichment is critical for effective managements of the ecosystems. Since released nutrients into coastal ecosystems are diluted and dissipated through tidal action and rapid uptakes by marine plants, monitoring of in situ nutrient concentrations may not be useful for detecting early eutrophication on coastal and estuarine ecosystems. To develop an effective indicator of cultural eutrophication using marine plants, tissue N content and area normalized leaf mass of eelgrass, Zostera marina were examined in Kosung Bay and Koje Bay on the south coast of Korea from June 2001 to April 2003. Eelgrass tissue N content exhibited obvious seasonal variations. Leaf N content was highest during winter and early spring and lowest during summer. Eelgrass tissue N content was higher at Kosung Bay site, which has higher sediment organic content, than at Koje Bay site. Area normalized leaf mass showed reverse trend of leaf N content, and consequently, eelgrass leaf N content and leaf mass exhibited strong negative correlation at both study sites. The results of the present study suggested that the ratio of eelgrass leaf N content to area normalized leaf mass can be applied to assess environmental nitrogen conditions on the coastal and estuarine ecosystems.

Seasonal Dynamics of the Seagrass Zostera marina on the South Coast of the Korean Peninsula

Lee, Kun-Seop,Kang, Chang-Keun,Kim, Young-Sang The Korean Society of Oceanography 2003 Journal of the Korean Society of Oceanography Vol.38 No.2

Although seagrasses are relatively abundant, few studies have been conducted on seagrass physiology and ecology in Korea. Zostera marina is the most abundant seagrass species, widely distributed throughout all coastal areas of the Korean peninsula. To examine seasonal dynamics and spatial variations of eelgrass, Zostera marina distributed on the coast of Korea, morphological characteristics, biomass, tissue nutrient constituents, leaf productivity and environmental factors were monitored monthly from the eelgrass beds in Kabae Bay and Kosung Bay on the south coast of the Korean peninsula from June 2001 to June 2002. Eelgrass density, biomass, morphological characteristics, leaf productivities, and tissue nutrient constituents exhibited clear seasonal variations, and these seasonal trends reflected seasonal changes in water temperature. Eelgrass shoot density and biomass at Kabae Bay site showed more obvious seasonal trends than Kosung Bay. No strong seasonality in Kosung Bay site appeared to be caused by high water temperature ($>30{\circ}C$) during summer months at this site. Despite differences in nutrient availabilities between two study sites, eelgrass biomass and leaf productivities were not significantly different between study sites, and this lack of spatial variations implies that the ambient nutrient availabilities at the present study sites are in excess of seagrass nutrient demand. Eelgrass tissue N content and sediment pore water DIN concentrations exhibited reverse relationship at the present study. This reverse relationship suggests in situ nutrient concentrations are not good indicator of nutrient availabilities, and regeneration and turnover rates of sediment nutrients are also important factors to determine nutrient availabilities at the site.

Production Assessment of Eelgrass, Zostera marina Using the Plastochrone Method Compared with the Conventional Leaf Marking Technique

Lee, Kun-Seop The Korean Society of Oceanography 2004 Journal of the Korean Society of Oceanography Vol.39 No.3

Since seagrasses are highly productive and provide a source of organic carbon for a wide variety of marine organisms in coastal and estuarine ecosystem, accurate assessment of seagrass production is critical to understand the functions and values of seagrasses in these ecosystems. Zieman's leaf marking technique has been mostly used to estimate seagrass leaf production rates. However, inherent problems on the traditional leaf marking technique have been discussed by the several researchers, and these problems can cause underestimation of seagrass production. To develop an accurate and reliable assessing method for seagrass production, production rates of eelgrass, Zostera marina in three bay systems on the south coast of the Korean peninsula were estimated using the conventional leaf marking technique and the plastochrone method. The plastochrone method has been recently suggested as an effective method for reliable assessments of seagrass production. In the present study, leaf production rates estimated by the plastochrone method were significantly higher than the rates derived from the traditional leaf marking technique. Annual eelgrass leaf production assessed using the leaf marking technique was about 65 to 89% of the estimated production using the plastochrone method. The differences in annual productions between assessment techniques imply that the conventional leaf marking technique significantly underestimated eelgrass leaf production. Total eelgrass productions estimated using the plastochrone method in the present study sites were about 600 to 806 g DW $m^{-2} y^{-l}$, and below-ground production accounted for about 20 to 23% of the total production. The plastochrone method was suggested to be an effective and accurate assessing method for eelgrass production.

수치표고모델(DEM) 환경에서의 Fast Marching Method(FMM)/폐루프 제어기법 기반 달 탐사로버의 경로계획 및 추종

김건중(Kun-Jung Kim),Giancarlo Eder Guerra Padilla,심병섭(Byeong-Seop Sim),유기호(Kee-Ho Yu) 제어로봇시스템학회 2019 제어·로봇·시스템학회 논문지 Vol.25 No.12

When a lunar exploration rover is running on the surface of the Moon on a scientific mission, the integration of various technologies including the navigation and control strategy considering the slippage and geometric singularity is required to enable the exploration rover to traverse while avoiding hazardous areas and following predefined path. Up to this point, this paper proposed a path planning/following algorithm to efficiently navigate the lunar exploration rover and track the predefined path. We first create a Digital Elevation Model (DEM) as infrastructure in simulation environment map based on the diamond-square midpoint displacement algorithm, and then generates the optimal path on the grid map using fast marching method (FMM). In order to let the exploration rover to track the generated path, the path tracking algorithm considering the slippage and geometric singularities based feedback control is also proposed. Using the wheel-terrain interaction model, the multi-body dynamics simulation induced longitudinal/lateral dynamics on the DEM map was carried out to verify the performance of the proposed algorithm. Finally, numerical analysis is presented to demonstrate the effectiveness of proposed path planning and path following controller.