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박가희,박리라,송종우,Park, Gahee,Park, Rira,Song, Jongwoo 한국통계학회 2017 응용통계연구 Vol.30 No.1
최근 경륜은 2015년도 기준, 5백만 명 이상의 많은 사람들이 참여하고 2조를 넘어선 매출을 발생시키는 대중적인 레저스포츠로서 자리 잡고 있다. 본 연구의 목적은 다양한 통계적 분석기법을 사용하여 경륜경기의 순위를 예측하고, 순위에 유의한 영향을 미치는 변수들을 파악하는 데에 있다. 다양한 Classification 방법과 Regression 방법들을 적용하여 순위예측모형을 만들고 비교분석하였다. 대부분의 모형에서 공통적으로 선택된 변수들을 살펴보면, 등급이 강급될수록, 종합득점이 높을수록 순위가 높아지며 반대로 등급이 승급될수록, 번호 4번을 부여받을수록 그리고 최근성적의 순위가 낮을수록 순위가 낮아지는 것을 알 수 있었다. 또한, 선수의 실력과 관련된 연속형 변수들을 각 경기별로 평균값을 빼서 보정한 자료와 원자료를 사용하여 모형을 적합시킨 결과 모든 모형에서 보정된 자료를 사용하였을 때 더 낮은 오분류율을 보였다. 마지막으로 분석에 사용하지 않은 최근 한 달 경기결과를 예측해서 베팅했을 때 모든 경우에 예측률은 높았지만 큰 이익을 거두지 못했는데 그 이유는 낮은 배당률을 가진 경기의 결과만을 잘 예측했기 때문이다. Over 5 million people participate in cycle racing betting and its revenue is more than 2 trillion won. This study predicts the ranking of cycle racing using various statistical analyses and identifies important variables which have influence on ranking. We propose competitive ranking prediction models using various classification and regression methods. Our model can predict rankings with low misclassification rates most of the time. We found that the ranking increases as the grade of a racer decreases and as overall scores increase. Inversely, we can observe that the ranking decreases when the grade of a racer increases, race number four is given, and the ranking of the last race of a racer decreases. We also found that prediction accuracy can be improved when we use centered data per race instead of raw data. However, the real profit from the future data was not high when we applied our prediction model because our model can predict only low-return events well.
Lee, Min Woo,Seo, Rira,Lee, Yu Jeong,Bae, Ju Hye,Park, Jung-Kwon,Yoon, Joung-Hahn,Lee, Jei Wan,Jung, Ho Won Elsevier 2016 Biochemical and biophysical research communication Vol.480 No.3
<P><B>Abstract</B></P> <P>An <I>Arabidopsis thaliana ALTERED MERISTEM PROGRAM1</I> (<I>AtAMP1</I>), which encodes a putative glutamate carboxypeptidase, not only controls shoot apical meristem development, but also is involved in tolerance response to abiotic stresses. Here, we introduce a novel mutant; named <I>amp1-32</I> that is a phenocopier to previously isolated different <I>amp1</I> mutant alleles. Interestingly, tiny leaves were continuously developed at the bottom of pre-emerged leaves in the <I>amp1-32</I>. The <I>amp1-32</I> mutant was less sensitive to heat shock treatment lasting for 3 h, whereas disease symptoms were severely developed in the mutant after <I>Pseudomonas syringae</I> infection. The mRNA levels of 171 genes were significantly altered in the mutant, as compared to wild-type plants. The transcription of genes involved in hormone signaling, post-embryonic development, and shoot development were up-regulated in the <I>amp1-32</I> mutant, whereas expression of genes related to responsiveness to pathogens and (in)organic matters, were decreased in the mutant. Taken together, perturbation of CK- and ABA-related events by AMP1 mutation caused aberrant development phenotype and conflicting responses against abiotic and biotic stresses in <I>Arabidopsis</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel amp1-32 mutant shows aberrant growth and development phenotypes. </LI> <LI> The amp1-32 mutant tolerates heat treatment, but shows severe symptom development after <I>P. syringae</I> infection. </LI> <LI> Mutation of the AMP1 causes transcriptional reprogramming in Arabidopsis. </LI> </UL> </P>
A chemical biology route to site-specific authentic protein modifications
Yang, Aerin,Ha, Sura,Ahn, Jihye,Kim, Rira,Kim, Sungyoon,Lee, Younghoon,Kim, Jaehoon,Sö,ll, Dieter,Lee, Hee-Yoon,Park, Hee-Sung American Association for the Advancement of Scienc 2016 Science Vol.354 No.6312
<P>Many essential biological processes are controlled by posttranslational protein modifications. The inability to synthetically attain the diversity enabled by these modifications limits functional studies of many proteins. We designed a three-step approach for installing authentic posttranslational modifications in recombinant proteins. We first use the established O-phosphoserine (Sep) orthogonal translation system to create a Sep-containing recombinant protein. The Sep residue is then dephosphorylated to dehydroalanine (Dha). Last, conjugate addition of alkyl iodides to Dha, promoted by zinc and copper, enables chemoselective carbon-carbon bond formation. To validate our approach, we produced histone H3, ubiquitin, and green fluorescent protein variants with site-specific modifications, including different methylations of H3K79. The methylated histones stimulate transcription through histone acetylation. This approach offers a powerful tool to engineer diverse designer proteins.</P>