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오리나무 열매를 이용한 생물처리장치에서의 톨루엔 가스 처리효율 특성
공남식,차수길,서정윤 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.6
This study was to examine characteristics of treating toluene vapor, which gets to be problematic due to its harmful carcinogenicity and mass generation from various sources, through a biological treatment facility which is environment-friendly and adopts a high-efficient and low-cost clean technology. In order to identify whether Alnus Firma Fruit (AFF) can be used as a media for a bioreactor, its utility and basic operating factors, a study was conducted on pressure drop, supply of nutrient substances and retention time which are operating factors of a biofilter, and eliminating characteristics were compared between AFF and the conventional biological activated carbon (BAC) widely used as filter media. In the case of AFF, the initial microbial deposits was 2.3 X 10^(7) CFU/g dry AFF, which represents the initial microbial density higher than the case of BAC showing 5.5 x 10^(6) CFU/g dry BAC. And it took about 2 weeks to acclimate until its eliminating rate got to be increased over 90%. As a result of comparing pressure loss taking place with the lapse of time between BAC and AFF, after 130 days passed at SV 25 h^(-1), BAC showed that its eliminating efficiency had a tendency to drop greatly due to a great pressure loss (0.53-> 54.7 ㎜H₂O/m) caused by an excess of biomass as accumulated. On the other hand, AFF showed that the pressure drop was 0.53 ㎜H₂O/m, about 2 times as much as the initial pressure loss of 0.4 ㎜H₂O/m, which represents no great change in the pressure loss, and its eliminating efficiency was also shown to be continuously high. Therefore, when AFF was used as a filler for a biological treatment facility, a biological filter enabling improvement of the purifying efficiency to be promoted could be provided, and moreover, the pressure loss was so small that the filler replacement cycle or the back flushing cycle could be extended. So, even in terms of the operating cost, it was identified to be an economical filler. When an inorganic material was used as a filler, the biofilters performance acted sensitively on whether nutrient substances were supplied or not. In the case of AFF with low adsorptivity, addition of ethyl-alcohol increased the solubility of toluene, and consequently, biodegradation got to be actively made by microbes, and thus, its eliminating rate could be increased. As the flow velocity and the inflow concentration got to be more increased, its eliminating rate got to be lower, and particularly, an increase in the flow velocity made its eliminating rate drop more greatly than an increase in the concentration.
유종수,천병수,김남길 한국해양대학교 해양과학기술연구소 2001 硏究論文集 Vol.10 No.1
A tissue biosensor was developed for the continuous determination of Na+ channel blockers. The proposed sensor was applied to the determination of Na+ channel blockers in seaweed. It was found that Na+ channel blocker content displayed seasonal variation; it was high from February to April and decreased thereafter (May∼August). From theme results the present proposed method may be used for high sensitive determination of Na+ channel blockers contained in the seaweed organisms and environments. Therefore, it may be important to monitor Na+ channel blocker content of seaweed throughout the year.
Youngwoo Nam,Jung-Su Lee,Sang-Hyun Koh,Tae Su Kim,Sang-Gil Lee,Dae-Sung Won,Jong-Kuk Kim,Won Il Choi 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
Spatio-temporal distribution pattern of an ambrosia beetle, Platypus koryoensis (Murayama) which is vector of Raffaeleaquerci-mongolicae K.H. Kim et al, a causative agent for Korean oak wilt (KOW) was examined in the stand level. Spatial distribution of P. koryoensiswas influenced by their density. Relationship between degree of aggregation and density was positively correlated when the density was extremely low or high whereas the relationship was reverse when the density was intermediate. Patch of P. koryoensis formed around or near dead trees or partial dead trees, suggesting these trees indicated epicenter of P. koryoensis. Fraction of trees attacked by less than 100 individual of P. koryoensis in the stand per year increased abruptly whereas fraction of trees attacked over 1,000 individuals of P. koryoensis increased gradually. Our results showed that the dead trees would be an epicenter of P. koryoensis and the number of trees killed by the ambrosia beetle would be reduced by lowering total population of the ambrosia beetle around the epicenter.
Kiyoung Jang,Su-Jin Jung,Hong Gil Lee,Nam-Chon Paek,Pil Joon Seo 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Floral transition is influenced by environmental factors such as light and temperature. Plants are capable of integrating photoperiod and ambient temperature signaling into their developmental program. Despite extensive investigations on individual genetic pathways, little is known about the molecular components that integrate both pathways. Here, we demonstrate that the RING finger–containing E3 ubiquitin ligase CONSTITUTIVE PHOTOMORPHOGENIC1 (COP1) acts as an integrator of photoperiod and ambient temperature signaling. In addition to the role in photoperiodic destabilization of CONSTANS (CO), COP1 also regulates temperature sensitivity by controlling the degradation of GIGANTEA (GI). COP1-impaired mutants showed reduced sensitivity to low ambient temperature. Notably, COP1 is more stabilized at low temperature and accelerates GI turnover in a 26S proteasome-dependent manner. The direct association of GI with the promoter of FLOWERING LOCUS T (FT) depends on ambient temperature, and thus COP1-triggered GI turnover delays flowering at low temperatures via a CO-independent pathway. Taken together, our findings indicate that environmental conditions regulate the stability of COP1, and conditional specificity of its target selection stimulates proper developmental responses and ensures reproductive success.
Nam-Gyu Im,Kyung-Rok Oh,Min-gil Kim,Young Lee,Na-Na Lim,Tae-Hwan Cho,Su-Ra Ryu,Seo-Ra Yoon 대한재활의학회 2022 Annals of Rehabilitation Medicine Vol.46 No.6
Objective To investigate the effect of low frequency cerebellar repetitive transcranial magnetic stimulation (rTMS) on balance impairment in patients with cerebral infarction.Methods Thirty-two patients were randomly divided into two groups: rTMS group (n=16) and control (n=16). In the rTMS group, treatment was performed five times per week for 2 weeks (10 sessions), and in the control group, a sham coil was used with the sound and sensation of scalp similar to the rTMS coil. Patients in both groups underwent a conventional rehabilitation program. Berg Balance Scale (BBS) was used as the primary outcome measurement. Timed Up and Go test (TUG), 10-m walk test (10mWT), and Activity-specific Balance Confidence scale (ABC) were used as the secondary outcome measurement. All scales were measured at baseline (T0), after 10 sessions of rTMS (T1), and at 4 weeks after treatment completion (T2) by therapists with over 5 years of clinical experience.Results There were significant improvements between T0 and T1, and between T0 and T2, for all assessed items in the rTMS group. Whereas there were significant improvements between T0 and T1, and between T0 and T2, for the BBS and 10mWT in the control group. TUG (-4.87±5.05 vs. -0.50±2.97 seconds) and ABC score (8.10±8.33 vs. 0.16±0.97) were observed significant differences in comparison of the changes from T0 to T1 between the two group. BBS score (4.40±3.66 vs. 1.88±3.14), TUG (-4.87±4.56 vs. -0.62±2.96 seconds) and ABC score (8.22±7.70 vs. -0.09±0.86) differed significantly from T0 to T2 between the two groups.Conclusion Our findings suggest that low-frequency cerebellar rTMS is helpful for improving balance in patients with cerebral infarction, and maybe a beneficial treatment for these patients.
Development of Non-Lubricated Die for Magnesium Sheet Forming of Car Body Part
Nam, Jae-Du,Cha, Seung-Hoon,Ahn, Min-Su,Seo, Pan-Ki,Won, Kwang-Woo,Kang, Chung-Gil 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.6
According to current development trends for automotive body parts, light weight is a key issue in improving fuel efficiency and $CO_2$ reduction. Compared to steel and aluminum, magnesium has a relatively low specific gravity. However, it is challenging to use magnesium to produce a product at room temperature because magnesium has a Hexagonal Close-Packed (HCP) crystal structure. Therefore, the structure is not suitable for plastic deformation without using a heating system. As a result, a magnesium sheet and die need to be heated from 250 to $300^{\circ}C$. Unfortunately, this procedure has positive and negative effects. It increases not only the material's elongation, but also the friction between the material and die during warm forming. Furthermore, lubricant cannot be used due to corrosion occurring on the surface of a part after manufacturing. To overcome these challenges, we developed a "Partition panel", which is a warm-formed part with a non-lubricated die with a Diamond-Like Carbon (DLC) coating. A one-quarter sized prototype was successfully produced with the DLC-coated non-lubricated die, and its characteristics were verified through an evaluation of the friction coefficient and mechanical properties.
A Study for Torrefaction Characteristic of Pilot Scale of Torrefaction System using EFB
( Gil Ju Park ),( Yun Myung Kim ),( Sang Jun Yi ),( Sang Ick Nam ),( Sung Bang Nam ),( Yeong-su Park ),( Yong Taek Lim ),( Jae-hoi Gu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Torrefaction process is a thermalchemical treatment carried out at a temperature range from 200 ℃ to 300 ℃, which improve energy density on the biomass by decomposition of hemicelluloses. We determined the performance of 200 kg/h scale of torrefaction system with rotary kiln type of reactor using EFB provided from Malaysia. From the results, we obtained 61.0% of mass yield with 5,456 kcal/kg of calorific value. The production of gas was 0.06 Nm<sup>3</sup> with 1,223 kcal/Nm<sup>3</sup>, which is 9.3% of gas yield.
Effect of pulverizing method on the particle size of matured silkworm powder
( Su-bae Kim ),( Kee-young Kim ),( Sang-deok Ji ),( Seong-wan Kim ),( Nam-suk Kim ),( You-young Jo ),( Jong-gil Kim ),( Young-guk Kim ),( Hui-yeon Koo ),( Hyung-chul Moon ),( Young-seek Seok ),( Hyun- 한국잠사학회 2018 International Journal of Industrial Entomology Vol.37 No.2
Recently matured silkworm powder was developed by RDA. In this study, the effect of pulverizing method on the particle size of matured silkworm powder was examined. FESEM was performed to observe the morphology and to measure the particle size of silkworm powder. Particle morphology of air-jet mill pulverized powder was round and smooth, however, those of roller-mill and hammer-mill pulverized mature silkworm was more harsh and square. Particle size was varied with pulverizing technique as follows; 1.1 μm (air-jet mill), 10 μm (roller mill), and 120 μm (hammer mill), respectively. A proximate analysis results of air-jet mill powder showed that crude protein, crude lipid, crude fiber, and ash was 73%, 12%, 1.95%, and 3.4%, respectively. According to our results, air-jet mell technique might be used to make a tiny matured silkworm powder.