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Kim, Byeongseok,Kim, Myung Sook The Korean Society of Phycology 2014 ALGAE Vol.29 No.3
There are recognized three new species of Polysiphonia sensu lato at a 10-20 m water depth from Jeju Island, Korea. We described the morphology of three new species and analyzed rbcL sequences to infer phylogenetic relationships among Polysiphonia sensu lato. Polysiphonia amplacapilli sp. nov. is characterized by an epiphytic, discoid holdfast, 5-7 pericentral cells, large trichoblasts, lateral branches connecting with trichoblasts, only slightly corticated in the basal parts, cut-off rhizoids and a spiral arrangement of tetrasporangia. Polysiphonia morroides sp. nov. is characterized by saxicolous, cut-off rhizoids, four pericentral cells, ecorticate, spiral arrangement of tetrasporangia, and it was collected at the fast-flowing water habitat in 20-25 m depth. Polysiphonia sabulosia sp. nov. is characterized by ecorticate, 5-6 pericentral cells, a single filamentous trichoblast, lateral branches connecting with the trichoblasts, cut-off rhizoids, and spiral arrangement of tetrasporangia, and is growing in the sandy locations. The phylogenetic analysis of rbcL sequences demonstrated that three new species are clearly distinguished from other species of Polysiphonia sensu lato.
Kim, Myung Sook,Kim, Su Yeon,Yang, Mi Yeon,Kim, Byeongseok,Diaz-Tapia, Pilar The Korean Society of Phycology 2012 ALGAE Vol.27 No.4
The genus Pterosiphonia is composed of 22 species worldwide and four of these species have been reported in the North-East Asia. In Korea, P. pennata originally described from the Mediterranean Sea has been previously recorded from the southern coast as a widespread species. In order to confirm the same species from Korea and Mediterranean, we observed the morphology of Korean Pterosiphonia specimen and analyzed rbcL sequences for inferring phylogenetic relationships among similar congeners. Korean entity was recognized as a new species, Pterosiphonia arenosa sp. nov. The new species is characterized by ecorticate axes with 7-10 pericentral cells, branches formed every two segments, and coalesced with main axis over 1-1.25 axial segments, and tetrasporangia formed in straight series on determinate branches of the upper parts of erect axes. A phylogenetic analysis of rbcL sequences demonstrated that P. arenosa was distinct from P. pennata found in Spain as well as other species. In conclusion, morphological and molecular sequence data indicated that P. arenosa sp. nov. has been previously misidentified as P. pennata in Korea.
Kim, Byeongseok,Cho, Kihyun,Choi, Jinyi,Shin, Dongwook American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.1
<P>NiO-YSZ composite powders were prepared by 2-step hydrothermal synthesis and applied as an anode functional layer to improve the performance of SOFCs. The precursor solution containing yttrium chloride, zirconium oxychloride, and nickel nitrate was hydrothermally treated at 100-130 degrees C for 36 h and then calcined at 900 degrees C for 4 h. The results of X-ray diffraction, Field-Emission Scanning Electron Microscope and Transmission Electron Microscope showed that the NiO (50-100 nm) and YSZ (200-300 nm) were successfully synthesized and these two phases were well separated with the weak agglomeration. Electrical conductivity of the cermet made from the powders produced by 2-step hydrothermal synthesis was much higher than that of the cermet prepared by ball milling. A single cell with anode functional layer showed a maximum power density of 1.7 W/cm2 at 800 degrees C, which may be owing to the homogeneous distribution and the small particle size of the obtained powders.</P>
자아존중감이 노인의 스트레스와 우울의 관계에 미치는 매개효과
김현순(Hyunsoon Kim),김병석(Byeongseok Kim) 한국노년학회 2007 한국노년학 Vol.27 No.1
이 연구는 스트레스와 노인 우울의 관계에 대한 자아존중감의 효과를 알아보기 위한 것이다. 이를 위해 경기도와 충청남도 지역의 65세 이상의 노인 234명을 대상으로 인구사회학적 변인, 스트레스 척도, 자아존중감 척도, 노인우울척도로 구성된 설문지를 실시하였다. 각 변인들 사이의 관계를 알아보기 위해 피어슨 적률 상관계수를 구하였고, 노인 스트레스와 우울간의 관계에 미치는 자아존중감의 효과를 검증하기 위해 회귀분석을 실시하였다. 연구 결과 첫째, 노인 우울은 스트레스와 정적 상관을, 자아존중감과 부적 상관을 보였다. 둘째, 자아존중감은 스트레스와 노인 우울사이에 매개효과가 있음이 확인되었다. 즉 자아존중감이 노인의 스트레스와 우울사이를 조절할 수 있음이 입증되었다. 이 연구의 시사점과 제한점, 그리고 추후 연구에서 고려할 점이 논의되었다. The purpose of this study was to investigate the effects of self-esteem on the relationship between stress and depression in the elderly. The subjects were 234 men and women over 65 years old who were living in Kyunggi-Do and Chungcheong-Do. The subjects completed socio-demographic factors questionnaire, Stress scale, Self-Esteem Scale, and Depression Scale. Regression anaysis was employed to analyze the data. The major findings were as follows: 1) The depression in the elderly were positively related to stress while negatively related to self-esteem. 2) The self-esteem was revealed to function as a mediator in the relationship between stress and depression in this population. Finally, the implications and limitations of this study were discussed, and the suggestions for future studies were also presented.