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Statistical Study on the Academic Achievement in Science of a Loneliness
Ko, Young Chun The Basic Science Institute Chosun University 2015 조선자연과학논문집 Vol.8 No.1
To explore effects on each friendship, family, romance, and community in sub-variables of loneliness on academic achievement in science for Y-middle school students, multiple regression analysis is carried out by stepwise method. As the results, I found the following facts. Academic achievement in science for the students was expressed by the following equation. Academic Achievement=48.765+4.012${\times}$[Family](t=2.082, p=.039)-3.957${\times}$[Romance](t=-3.147, p=.002)+5.281${\times}$[Community](t=2.965, p=.003). And each variable value of the explanatory power affecting academic achievement in science for the students is presented in order of community (12.0%), family (6.6%), and romance (6.3%). But the friendship variable is not significant in affecting academic achievement in science.
Comparison of Different Deep Learning Optimizers for Modeling Photovoltaic Power
Poudel, Prasis,Bae, Sang Hyun,Jang, Bongseog The Basic Science Institute Chosun University 2018 조선자연과학논문집 Vol.11 No.4
Comparison of different optimizer performance in photovoltaic power modeling using artificial neural deep learning techniques is described in this paper. Six different deep learning optimizers are tested for Long-Short-Term Memory networks in this study. The optimizers are namely Adam, Stochastic Gradient Descent, Root Mean Square Propagation, Adaptive Gradient, and some variants such as Adamax and Nadam. For comparing the optimization techniques, high and low fluctuated photovoltaic power output are examined and the power output is real data obtained from the site at Mokpo university. Using Python Keras version, we have developed the prediction program for the performance evaluation of the optimizations. The prediction error results of each optimizer in both high and low power cases shows that the Adam has better performance compared to the other optimizers.
Statistical Verification of Effects of Science Academic Performance on Emotional Expressiveness
Kim, Kyung Nam,Ko, Young Chun The Basic Science Institute Chosun University 2018 조선자연과학논문집 Vol.11 No.1
Since the statistical significance levels of each F value (2.90 and 3.55) for positive expressiveness (PE) and negative expressiveness (NE) are all p<.01, it is found that there is a significant difference of PE and NE by science score. But, since the significant value of F value (1.725) for impulse strength (IS) is .095 (p>.05), it can be seen that there is no significant difference in IS by science score. The higher the science score, the larger the PE values and the lower the NE values. However, even if the science score increases, the IS values do not show a trend in a certain direction.
Mathematical Approach on Composition of Nomination Committee for University President Election
Yi, Sucheol,Heo, Sunyeong The Basic Science Institute Chosun University 2016 조선자연과학논문집 Vol.9 No.1
The university president direct election system in Korea had begun in 1987 as a movement of college democratization in the 1980s after 6.29 Declaration. Since then, many national/private universities had adopted the election system. However, it has posed many problems and it caused a sharp division of opinions between those who approve and disapprove the direct election system. Since 2005, the government has made official of the reformation and/or abolition of the university president direct election system, and has kept pushing for universities to give up the direct election system. Now, only 3 or 4 universities hold on to the system, and many universities have changed into the indirect election system. In the indirect election, a key is the composition of president nomination committee, which confirms the university members's variety. Many universities adopting the indirect election system have used simple random sampling, like drawing lots, to compose the president nomination committee. However, drawing lots has a problem that it has large possibility of composing a biased committee. This research suggests systematic sampling as an alternative to drawing lots. A numerical analysis was conducted using a data of a university in which the indirect election was implemented recently. The drawing lots gave the biased nomination committee. On the other hand, the systematic sample improves the problem and confirms more the variety of all members.
A New Approach to Synthesis and Photoluminescence of Silicon Nanoparticles
Kim, Beomsuk The Basic Science Institute Chosun University 2009 조선자연과학논문집 Vol.2 No.1
We describe the synthesis and characterization of silicon nanoparticles prepared by the soluton reduction of SiCl4. These reactions produce Si nanoparticles with surfaces that are covalently terminated. The resultant organic derivatized Si nanoparticles as well as a probable distribution of Water-soluble Si nanoparticles are observed and characterized by photoluminescence(PL) spectroscopy. This work focuses originally on the organic- and water-soluble silicon nanoparticles in terms of the photoluminescence. Further this work displays probably the first layout of hydrogen terminated Si nanoparticles synthesized in solution at room temperature.
Study of antimicrobial activity and the mode of action of Anal P5 peptide
Park, Yoonkyung,Hahm, Kyung-Soo The Basic Science Institute Chosun University 2008 조선자연과학논문집 Vol.1 No.1
In a previous study, we showed that Cecropin A (1-8)-Magainin 2 (1-12) hybrid peptide (CA-MA)'s analogue, Anal P5, exhibit broad-spectrum antimicrobial activity. Anal P5, designed by flexible region (positions 9, 10)-substitution, Lys- (positions 4, 8, 14, 15) and Leu- (positions 5, 6, 12, 13, 16, 17, 20) substitutions, showed an enhanced antimicrobial and antitumor activity without hemolysis. The primary objective of the present study was to gain insight into the relevant mechanisms of antimicrobial activities of Anal P5 by using flow cytometric analysis. Anal P5 exhibits strong antifungal activity in a salt concentration independent manner. In addition, Anal P5 causes significant morphological alterations of the bacterial surfaces as shown by scanning electron microscopy, supporting its antibacterial activity. Its potent antibiotic activity suggests that Anal P5 is an excellent candidate as a lead compound for the development of novel antibiotic agents.
Ko, Young Chun The Basic Science Institute Chosun University 2009 조선자연과학논문집 Vol.2 No.1
Electrochemistry of 1.0 mM tris(2,2'-bipyridyl)ruthenium(II) ($Ru(bpy)_3{^{2+}}$) in 300 mM $H_2SO_4$ solution with and without sodium dodecyl sulfate (SDS) is studied. In the presence of SDS, $E_{pa}$ of $Ru(bpy)_3{^{2+}}$ shifts to positive direction compared to the SDS free case. The intersection of two lines on ${\Delta}E_p$ vs. -log[SDS] plot is measured as a critical micelle concentration (CMC), which is 3.67 mM SDS.
Selective Reduction of Orgainc Compounds with Al-Fluorodiisobutylalane
차진순,박성진,Cha, Jin Soon,Park, Seung Jin The Basic Science Institute Chosun University 2009 조선자연과학논문집 Vol.2 No.3
The new MPV-type reagent, Al-fluorodiisobutylalane (DIBAF), has been prepared and their reducing characteristics in the reduction of selected organic compounds containing representative functional groups have been examined in order to find out a new reducing system with unique applicability in organic synthesis. In general, the reagent is extremely mild, showing only reactivity toward aldehydes, ketones, and epoxides. The reagent achives a clean 1,2-reduction of enals to the corresponding allylic alcohols in a 100% purity, but shows no reactivity toward enones. The reagent also shows an excellent regioselective cleavage of substituted epoxides. In addition, DIBAF produces the thermodynamically more stable alcohol epimer in high stereoselectivity in the reduction of cyclic ketones.
Interaction of brassinosteroids and cytokinin in modulating light mediated signaling in Arabidopsis
Hwang, Indeok,Paudyal, Dilli P.,Cheong, Hyeonsook The Basic Science Institute Chosun University 2008 조선자연과학논문집 Vol.1 No.1
Brassinosteroids (BRs) are a special class of plant steroid hormones that are essential for normal growth and development. Part of confusion is whether BRs are unique to plants, because they have overlapping physiological roles with other better-studied hormones and with physiological responses caused by light. In systems designed to assay for cytokinins, the effects of BRs vary. We measured hypocotyl length for testing the ability of brassinolide (BL) to rescue double mutant between det2 and the photoreceptor null mutant phytochrome B (phyB). PHYB involved in controlling hypocotyl elongation in increased concentration of BL whereas phyBdet2 double mutant just partially rescue to phyB in white and red light indicated the involvement of BRs in PHYB regulated cell elongation. BRs regulated hypocotyl growth was delayed by BAP, a cytokinin treatment but inhibitory effects of BAPs on hypocotyl growth was slightly recovered by BL. The result indicated that the mode of action of BR and cytokinin is independent or sequential in the downstream light-regulated response control on hypocotyl elongation and also light modulated the action of BR and cytokinin in some extent.
Synthesis and Antifungal Activity of Dithiocarbamoic Acid Derivatives
김하연,이종대,Kim, Ha-Yeon,Lee, Jong-Dae The Basic Science Institute Chosun University 2009 조선자연과학논문집 Vol.2 No.3
Dithiocarbamoic acid and their derivatives were found to readily react with potassium and sodium hydroxide to give the corresponding alkali metal dithiocarbamoic acid derivatives 8-17 in moderate to good yields.