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김태헌(TaeHeon Kim),김성엽(SungYeup Kim),김유신(Yoosin Kim),홍민(Min Hong) 한국컴퓨터정보학회 2024 韓國컴퓨터情報學會論文誌 Vol.29 No.7
본 연구는 다양한 실내 환경에서 공기질을 모니터링 할 수 있는 다중 센서 시스템인 AirDeep-Room 을 설계 및 개발하였다. 이 시스템은 CO2, TVOC, 미세먼지, 온도, 습도 등을 실시간으로 측정하며, 멀티 센서를 통해 다양한 환경에서의 공기질 변화를 분석할 수 있는 장점을 제공한다. AirDeep-Room 시스템은 low data 형식으로 데이터를 실시간으로 확인할 수 있으며, 실내 환경에서의 공기질에 대한 분석을 진행하였다. 설계한 센서 시스템을 상이한 환경인 서버실과 강의실에 설치해 실험을 수행한 결과, 서버실에서의 온도와 습도는 –0.24의 음의 상관관계를, 강의실에서는 0.43의 양의 상관관계를 보였다. 강의실에서의 실험 결과는 학생 수와 CO2 및 TVOC 농도가 r=0.69로 높은 상관관계를 보였다. 이는 학생 수가 실내 공기질 변화에 중요한 영향을 미칠 수 있음을 보여준다. 이러한 결과는 AirDeep-Room 시스템이 다양한 환경에서 공기질을 보다 효과적으로 관리할 수 있는 기반을 제공하며, 인구 밀도가 높은 공간에서 공기질 개선을 위한 중요한 역할을 할 수 있을 것으로 기대된다. This study aims to design and develop AirDeep-Room, a multi-sensor system for monitoring air quality in various indoor environments. The system measures CO2, TVOC, particulate matter, temperature, and humidity in real-time. By integrating multiple sensors, AirDeep-Room allows convenient correlation analysis using low data format in real-time. The sensor system was installed in a server room and a classroom. Data analysis showed a negative correlation of -0.24 between temperature and humidity in the server room, and a positive correlation of 0.43 in the classroom, indicating different interactions. A high correlation (r=0.69) between the number of students and concentrations of CO2 and TVOC demonstrated the significant impact of occupancy on air quality. AirDeep-Room effectively manages air quality across various environments and provides essential data for improving air quality in densely populated areas.
Reanalysis of Ohno's hypothesis on conservation of the size of the X chromosome in mammals
Kim, Hyeongmin,Lee, Taeheon,Sung, Samsun,Lee, Changkyu,Kim, Heebal The Korean Society for Integrative Biology 2012 Animal cells and systems Vol.16 No.6
In 1964, Susumu Ohno, an evolutionary biologist, hypothesized that the size of X chromosome was conserved in mammalian evolution, and that this was based on chromosomal length. Today, unlike Ohno's method which was based on estimated lengths, we know the exact lengths of some mammalian sequences. The aim of this study was to reanalyze Ohno's hypothesis. In mammalian species, variation in the length of the X chromosome is greater than in the autosomes; however, this variation is not statistically significant. This means that differences in chromosomal length occur equally in the X chromosome and in the autosomes. Interspersed nuclear elements and genetic rearrangements were analyzed to maintain the same variance between the length of the X chromosome and the autosomes. The X chromosome contained fewer short interspersed elements (SINEs) (0.90 on average); however, it did contain more long interspersed elements (LINEs) than did autosomes (1.56 on average). An overall correlation of LINEs and SINEs with genetic rearrangements was observed; however, synteny breaks were more closely associated with LINEs in the autosomes, and with SINEs in the X chromosome. These results suggest that the chromosome-specific activities of LINEs and SINEs result in the same variance between the lengths of the X chromosome and the autosomes. This is based on the function of interspersed nuclear elements, such as LINEs, which can inactivate the X chromosome and the reliance of non-autonomous SINEs on LINEs for transposition.
Kim, Byoungjae,Jeong, Jonghwa,Mohanty, Aruna Kumar,Lee, Taeheon,Han, Sangmin,Heo, Jiwon,Jung, Ki-Suck,Kim, Jin-goo,Paik, Hyun-jong Elsevier 2017 Reactive & functional polymers Vol.120 No.-
<P><B>Abstract</B></P> <P>We synthesized poly(poly(ethylene glycol)methyl ether methacrylate)-<I>b</I>-poly(2-(dimethylamino)ethyl methacrylate) (p(PEGMA-<I>b</I>-DMAEMA)) by sequential addition of monomers and its quaternized products (p(PEGMA-<I>b</I>-(DMAEMA-<I>co</I>-QDMAEMA)) from the reaction with benzyl chloride for dispersion of copper phthalocyanine (CuPc). The structure of block copolymers was characterized by <SUP>1</SUP>H NMR and GPC analysis. The block copolymers were investigated for their dispersion performance of CuPc in propylene glycol monomethyl ether acetate. The dispersion states of CuPc by dispersants were studied using dynamic light scattering.</P>
Kim, Hyeongmin,Lee, Taeheon,Park, WonCheoul,Lee, Jin Woo,Kim, Jaemin,Lee, Bo-Young,Ahn, Hyeonju,Moon, Sunjin,Cho, Seoae,Do, Kyoung-Tag,Kim, Heui-Soo,Lee, Hak-Kyo,Lee, Chang-Kyu,Kong, Hong-Sik,Yang, Yo Oxford University Press 2013 DNA research Vol.20 No.3
<P>The modern horse (<I>Equus caballus</I>) is the product of over 50 million yrs of evolution. The athletic abilities of the horse have been enhanced during the past 6000 yrs under domestication. Therefore, the horse serves as a valuable model to understand the physiology and molecular mechanisms of adaptive responses to exercise. The structure and function of skeletal muscle show remarkable plasticity to the physical and metabolic challenges following exercise. Here, we reveal an evolutionary layer of responsiveness to exercise-stress in the skeletal muscle of the racing horse. We analysed differentially expressed genes and their co-expression networks in a large-scale RNA-sequence dataset comparing expression before and after exercise. By estimating genome-wide <I>d</I><SUB>N</SUB>/<I>d</I><SUB>S</SUB> ratios using six mammalian genomes, and F<SUB>ST</SUB> and iHS using re-sequencing data derived from 20 horses, we were able to peel back the evolutionary layers of adaptations to exercise-stress in the horse. We found that the oldest and thickest layer (<I>d</I><SUB>N</SUB>/<I>d</I><SUB>S</SUB>) consists of system-wide tissue and organ adaptations. We further find that, during the period of horse domestication, the older layer (F<SUB>ST</SUB>) is mainly responsible for adaptations to inflammation and energy metabolism, and the most recent layer (iHS) for neurological system process, cell adhesion, and proteolysis.</P>
Kim Taeheon,Kumaresan Yogeenth,Cho Sung Jun,Lee Chang-Lyoul,이헌,Jung Gun Young 나노기술연구협의회 2016 Nano Convergence Vol.3 No.33
As metal nanostructures demonstrated extraordinary plasmon resonance, their optical characteristics have widely been investigated in photo-electronic applications. However, there has been no clear demonstration on the location effect of plasmonic metal layer within the photoanode on both optical characteristics and photovoltaic performances. In this research, the gold (Au) nano-islands (NIs) film was embedded at different positions within the TiO2 nanoparticulate photoanode in dye-sensitized solar cells (DSSC) to check the effect of plasmon resonance location on the device performance; at the top, in the middle, at the bottom of the TiO2 photoanode, and also at all the three positions. The Au NIs were fabricated by annealing a Au thin film at 550 °C. The DSSC having the Au NIs-embedded TiO2 photoanode exhibited an increase in short circuit currents (Jsc) and power conversion efficiency (PCE) owing to the plasmon resonance absorption. Thus, the PCE was increased from 5.92% (reference: only TiO2 photoanode) to 6.52% when the Au NIs film was solely positioned at the bottom, in the middle or at the top of TiO2 film. When the Au NIs films were placed at all the three positions, the Jsc was increased by 16% compared to the reference cell, and consequently the PCE was further increased to 7.01%.