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Optimum Design of Volute Configuration in a Sirocco Fan using CFD and DOE
정욱희,최영석,이경용 대한설비공학회 2009 International Journal Of Air-Conditioning and Refr Vol.17 No.2
In this paper, a numerical study has been carried out to investigate the influence of volute geometries on the perfor-mance of a sirocco fan. In order to achieve an optimum volute design and explain the interactions between the dif-ferent geometric configurations in the volute system, three-dimensional computational fluid dynamics and the ‘de-sign of experiment’ method have been applied. Several geometric parameters, such as the volute expansion angle, the cut-off position and the bell mouth shape, are employed to improve efficiency and performance. 2k factorial designs were performed to screen the most influential parameters and interactions, and showed that the cut-off position and the bell mouth shape are the most significant parameters. The optimum design was selected as a result of the response surface methodology, and effects of these parameters and their interactions were presented. From the results of computational analyses and experimental data, the performance and efficiency of the sirocco fan were successfully improved. Also, detailed effects of geometric variables of the volute system on the fan performance were discussed.
정욱희,손기훈,Joong Seok Seo,Yu-Hoon Kim,황적준 한국분자세포생물학회 2012 Molecules and cells Vol.34 No.5
Quantitative RNA analyses of autopsy materials to diag-nose the cause and mechanism of death are challenging tasks in the field of forensic molecular pathology. Altera-tions in mRNA profiles can be induced by cellular stress responses during supravital reactions as well as by lethal insults at the time of death. Here, we demonstrate that several gene transcripts encoding heat shock proteins (HSPs), a gene family primarily responsible for cellular stress responses, can be differentially expressed in the occipital region of postmortem human cerebral cortices with regard to the cause of death. HSPA2 mRNA levels were higher in subjects who died due to mechanical as-phyxiation (ASP), compared with those who died by trau-matic injury (TI). By contrast, HSPA7 and A13 gene tran-scripts were much higher in the TI group than in the ASP and sudden cardiac death (SCD) groups. More importantly, relative abundances between such HSP mRNA species exhibit a stronger correlation to, and thus provide more discriminative information on, the death process than does routine normalization to a housekeeping gene. Therefore, the present study proposes alterations in HSP mRNA composition in the occipital lobe as potential forensic biological markers, which may implicate the cause and process of death.
피아노演奏會의 프로그램에 대한 考察 : 釜山의 演奏會를 中心으로 Through the investigation of Busan
鄭旭嬉 東亞大學校 敎育大學院 1981 敎育大學院 論文集 Vol.7 No.-
Western music was introduced in Korea for the first time 1885 when Mr. Underwood and Appenzeller came to Korea as evangelists. For the piano music, it would be reasonable to consider the year 1919 as the first introduction of piano music into Korea by Young-Whan Kim. The piano music has been remarkably developed for about 60 years. Recently, there are a lot of people who are majoring in piano performance. I have searched what kind of works were studied and performed by Korean pianists of Busan, which period they belong to, who composed them and have studied the reasonable direction for Korean musician to pursue in the future. I would like to know the situation of piano music of Busan which I have studied. As a result of my resarch, most of Korean pianists have performed the works which mostly belonged to the period of Baroque, Classism, Romanticism and a few works of Impressionism. I would like to emphasize that they should choose and perform the various works including New Music and especially Korean piano works. It was remarkable that Korean piano music twice for all performed in Busan. However I think many of Korean composers and pianists commonly recognize the necessity of the performance of Korean piano works. In the future, Korean musician should made a great deal of composition for the Korean piano music, furthermore, those works should be performed in our own concerts in order to develope Korean piano music improve that toward the international level. In conclusion, the above mention will be the basic idea which make the Korean piano music stand beside the world of music.