• Macromolecular Research
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• 제17권3호
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• pp.187-191
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• 2009

Platinum (Pt) nanoparticles were prepared by the liquid-phase reduction of tetraammineplatinum (II) chloride $([Pt(NH_3)_4]Cl_2)$ using Nafion as a stabilizer under various conditions of the Nation phase. This method is novel in its use of electrostatic interactions between the Pt complex ions and sulfonic groups in the hydrated Nation molecules. The synthesized Pt nanoparticles of the recast film system had a cubic shape. In the case of the Nation solution system, the Pt nanoparticles mainly had a spherical shape. The shapes and sizes of the Pt nanoparticles were strongly influenced by the Nation phase.

• 한국재료학회지
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• 제8권8호
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• pp.733-736
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• 1998

분자들이 용액 내에서의 cluster나 박막 내에서의 cluster와 같이 다른 cluster로 뭉쳐졌을 때, 가시광선과 자외선부근의 영역에서 fullerene $C_{60}$의 전자흡수 스펙트럼 변화가 관찰되었다. 2.73eV에서 흡수 피크들이 관찰되었는데, 이러한 피크들은 독립된 분자들로부터 온 것이 아니라 분자들의 직접적인 상호작용으로부터 온 것으로 생각된다. Grained fullerene 박막에서는 흡수피크들이 3.35eV에서도 관찰되었는데 이러한 피크들은 grain의 계면에서 분자들의 상호작용으로부터 온 것으로 생각된다. 이러한 흡수의 Dichroism은 비등방성 macrostructure를 갖는 시료에서도 관찰되었다.

• 한국광학회지
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• 제6권1호
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• pp.45-49
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• 1995

시간 상관 단일 광자 계수법을 사용하여 PVP/C/sub 2/H/sub 5/OH와 PEG/H/sub 2/O 혼합 용매에 위치한 rhodemine 6G 분자의 회전 재배열 시간을 측정하였다. 주어진 온도에서 혼합비를 변화시키면서 측정한 결과, PEG/H/sub 2/O와 PVP/C/sub2/H/sub 5/OH에서 각각 회전 이완 시간이 혼합액의 점성도에 선형적으로 비례하지 않는 것으로 관측되었다. 고분자 주의에 cluster가 형성된다는 관점에서 혼합비에 따른 회전 이완 시간의 변화를 설명하였다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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• pp.201-206
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• 1998

In this paper, we have considered the method for clustering land cover types over the East Asia from AVHRR data. The feature vectors such that maximum NDVI, amplitude of NDVI, mean NDVI, and NDVI threshold are extracted from the 10-day composite by maximum value composite(MVC) for reducing the effect of cloud contaninations. To find the land cover clusters given by the feature vectors, we are adapted the self-organizing feature map(SOFM) clustering which is the mapping of an input vector space of n-dimensions into a one - or two-dimensional grid of output layer. The approach is to find first the clusters by the first layer SOFM and then merge several clusters of the first layer to a large cluster by the second layer SOFM. In experiments, we were used the 8-km AVHRR data for two years(1992-1993) over the East Asia.

• International Journal of Advanced Culture Technology
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• 제8권4호
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• pp.144-152
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• 2020

The purpose of this study is to examine the effects of university students' media sports immersion experience through social media on exercise immersion and exercise continuation. This research target was first selected as a population of university students who have contacted media sports aged 20 or older living in Gwangju Metropolitan City in 2019. The sampling procedure was divided into five parts: Dong-gu, Seo-gu, Nam-gu, Buk-gu, and Gwangsan-gu in Gwangju, and 300 men and women were sampled using cluster random sampling. After individually entering coded data into the computer, the statistical program (SPSS Windows.20.0 Version) was used. The results obtained through this research process are as follows. First, it was found that university students' immersion to media sports had a partial effect on their commitment to exercise. Second, it was found that university students' immersion in media sports had a partial effect on the continuation of the exercise. Third, it was found that college students' exercise commitment has a partial effect on exercise continuation.

• Journal of Microbiology and Biotechnology
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• 제26권2호
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• pp.248-254
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• 2016

A soil metagenome contains the genomes of all microbes included in a soil sample, including those that cannot be cultured. In this study, soil metagenome libraries were searched for microbial genes exhibiting lipolytic activity and those involved in potential lipid metabolism that could yield valuable products in microorganisms. One of the subclones derived from the original fosmid clone, pELP120, was selected for further analysis. A subclone spanning a 3.3 kb DNA fragment was found to encode for lipase/esterase and contained an additional partial open reading frame encoding a wax ester synthase (WES) motif. Consequently, both pELP120 and the full length of the gene potentially encoding WES were sequenced. To determine if the wes gene encoded a functioning WES protein that produced wax esters, gas chromatography-mass spectroscopy was conducted using ethyl acetate extract from an Escherichia coli strain that expressed the wes gene and was grown with hexadecanol. The ethyl acetate extract from this E. coli strain did indeed produce wax ester compounds of various carbon-chain lengths. DNA sequence analysis of the full-length gene revealed that the gene cluster may be derived from a member of Proteobacteria, whereas the clone does not contain any clear phylogenetic markers. These results suggest that the wes gene discovered in this study encodes a functional protein in E. coli and produces wax esters through a heterologous expression system.

• 대한방사선기술학회지:방사선기술과학
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• 제26권2호
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• pp.71-78
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• 2003

SPM99를 이용한 뇌지도 작성 과정에서 각각의 뇌 영상을 SPM99에서 제공하는 template image와 소아의 영상으로 만든 template image로 각각 공간 규격화하였을때 소아 ADHD 환자의 정상인 소아와 환자 그룹간의 비교를 실행하여 뇌혈류의 변화를 분석, 결과를 비교하였다. P-value를 0.05로 하였을 때 SPM99에서 제공하는 template image로 규격화하여 t-test를 한 결과 Inter-hemispheric 부근과 대뇌 후두엽에서 혈류량이 증가하는 것을 볼 수 있으나 12명의 정상 소아의 평균 image로 만든 template image로 규격화한 결과의 경우 좌뇌(Left Cerebrum)의 두정엽(Parietal Lobe)에서 또 다른 혈류량증가의 cluster가 나타났다.

• 한국재료학회지
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• 제9권5호
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• pp.528-532
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• 1999

Y$_2$O$_3$films were grown on SiO$_2$-covered Si(111), and hydrogen-terminated Si(111), and hydrogen-terminated Si(111) substrates at 50$0^{\circ}C$ by ultrahigh vacuum ionized cluster beam deposition (UHV-ICB). The microstructures and growth behavior of these films have been investigated by transmission electron diffraction (TED) and high-resolution transmission electron microscopy(HREM). The TED results show that the $Y_2$O$_3$grown on the SiO$_2$-Si has the epitaxial relationship of (11-1)Y$_2$O$_3$∥(111)Si and [-110]Y$_2$O$_3$∥[-110]Si. The film on the H-Si substrate contains YS\ulcorner and amorphous YSi\ulcornerO\ulcorner layers at the interface, having the orientation relationship each other. For the YSi\ulcorner and the Si substrate, the relationship is (0001)YSi\ulcorner∥(111)Si and [1-210]YSi\ulcorner∥∥[-110]Si. For the $Y_2$O$_3$and the YSi\ulcorner ; the relationship is as follows: (11-1)Y$_2$O$_3$∥(0001)YSi\ulcorner and [-110]Y$_2$O$_3$∥[1-210]YSi\ulcorner(111)Y$_2$O$_3$∥(0001)YSi\ulcorner and [-110]Y$_2$O$_3$∥[1-210]YSi\ulcorner. Explanation is given to describe the formation mechanisms of the interfacial phases of SiO\ulcorner, YSi\ulcornerO\ulcorner and YSi\ulcorner. It is shown that the crystallinity of the $Y_2$O$_3$film on the SiO$_2$-Si(111) is better than that of $Y_2$O$_3$on H-Si(111).

• Journal of Life Science
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• 제11권2호
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• pp.126-134
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• 2001

The phylogenetic tree displayed the presence of five groups in the Phellinus genus, which were distinguished based on their morphology. Most of the p. linteus appeared a cluster which was highly significant with the exception of P. linteus KACC 500122 and KACC 500411. They formed the sister taxa of P 1inteus where P. baumii, Phellinus sp. MPNU 7003, MPNU 7007, and MPNU 7010 had similar morphological characteristics. Also, P. nigricans IMSNU 32024 and P. pini var, carniformans IMSNU 32031 were grouped in the same cluster with P. igniarius KCTC 6227, KCTC 6228, and P. chrysoloma KCTC 6225 extracted from the Gen-Bank database. P. torulosus IMSNU 32028 and Phellinus sp. MPNU 7011 formed a closed group, however, these species had a distant taxa when compared with the other Phellinus species. The nucleotide sequences of the internal transcribed spacer (ITS) regions of ribosomal DNA (rDNA) including the 5.85 rDNA were determined from 24 strains of the Phellinus genus in order to analyze their phylogenetic relationship. These fungi were divided into two basic groups based on their ITS length, however, this grouping was different from that based on their morphological characteristics. Although various ITS sequences were ambiguously aligned, conserved sites were also identified. Accordingly, a neighbor-joining tree was constructed using the nucleotide sequence data of the conserved sites of the ITS regions and the 5.8S rDNA.

• 한국산학기술학회논문지
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• 제11권12호
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• pp.4945-4953
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• 2010

이 연구는 중학생의 성별 및 신체상에 따른 체육목표 및 체육개념에 대한 인식수준을 분석하는 것으로, 중학생을 대상으로 유층집락무선표집법을 이용하여 남학생 267명, 여학생 166명 등의 총 443명을 표집하였다. 연구목적을 위해 사용된 도구는 Figure Rating Scale(FRS)과 체육목표 및 개념에 관한 설문지이며, 수집된 자료는 Windows용 SPSS/PC Ver 12.0 프로그램을 이용하였다. 조사대상자의 성별에 따른 체육개념 및 목표의 차이를 분석하기 위해서 t-검증을 실시하였으며, 조사대상자의 신체상에 따른 체육개념 및 체육목표의 차이를 알아보기 위하여 일원변량분산분석을 실시하였고, Scheffe의 사후검정을 실시하였다. 이러한 분석을 통해 첫째, 중학생의 체육의 개념과 목표에 대한 인식에서 남학생이 여학생 보다 높은 인식을 가지고 있었다. 둘째, 정상 체형의 중학생이 다른 체형의 중학생에 비해 체육개념과 목표에 대한 인식도가 높았다. 이러한 결과는 올바른 신체상과 건강한 체형을 형성 유지할 수 있도록, 또한 여학생에게도 체육개념과 체육목표를 경험으로서, 문화재생산으로서, 교과내용을 경험할 수 있도록 포괄적인 개념의 범위와 계열 및 계획된 수업진행이 필요한 것으로 나타났다.