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Isolation and Analysis of the Enzymatic Properties of Thermophilic Fungi from Compost
Lee, Hanbyul,Lee, Young Min,Jang, Yeongseon,Lee, Sangjoon,Lee, Hwanhwi,Ahn, Byoung Jun,Kim, Gyu-Hyeok,Kim, Jae-Jin The Korean Society of Mycology 2014 Mycobiology Vol.42 No.2
To the best of our knowledge, this is the first report on thermophilic fungi isolated in Korea. Three species of thermophiles were isolated from compost and were identified as Myriococcum thermophilum, Thermoascus aurantiacus, and Thermomyces lanuginosus. They can grow at temperatures above $50^{\circ}C$ and produce high levels of cellulolytic and xylanolytic enzymes at high temperatures. Notably, the considerable thermostability of the endo-glucanase produced by T. aurantiacus has made the fungus an attractive source of industrial enzymes.
( Hanbyul Lee ),( Young Min Lee ),( Yeongseon Jang ),( Sangjoon Lee ),( Hwanhwi Lee ),( Byoung Jun Ahn ),( Gyu Hyeok Kim ),( Jae Jin Kim ) 한국균학회 2014 韓國菌學會誌 Vol.42 No.2
To the best of our knowledge, this is the first report on thermophilic fungi isolated in Korea. Three species of thermophiles were isolated from compost and were identified as Myriococcum thermophilum, Thermoascus aurantiacus, and Thermomyces lanuginosus. They can grow at temperatures above 50oC and produce high levels of cellulolytic and xylanolytic enzymes at high temperatures. Notably, the considerable thermostability of the endo-glucanase produced by T. aurantiacus has made the fungus an attractive source of industrial enzymes.
이상준(Sangjoon Lee),조성재(Seongje Cho),이종태(Jongtai Lee),이성열(Songyol Lee) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Swirl velocity, turbulence intensity and turbulent scale were investigated in order to analyze the charateristics of swirl flow which was created in constant volume vessel. Flow velocity was measured by use of hot wire anemometer.<br/> Turbulence intensity was in proportion to mean flow velocity regardless of swirl velocity. And integral time scale and integral length scale have inverse proportional and proportional relation with swirl velocity regardless of measurement position.<br/>
Increase in the DSSC Efficiency When Using Metal-coated Carbon Nanowall Counter Electrodes
Sangjoon Lee,최원석,임동건,최은창,홍병유 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.3
This research was conducted to improve the efficiency of dye-sensitized solar cells (DSSCs) usingmetal-layer-coated carbon nanowalls (CNWs) as counter electrodes. The CNWs were synthesizedon a fluorine-doped tin-oxide (FTO) glass substrate in a microwave plasma-enhanced chemical vapordeposition (PECVD) system using methane (CH4), and the CNWS were sputter-coated with metalfilms several times by using an RF magnetron sputtering system and four-inch metal targets (Cu,W and Ni, separately). Then, the metal-layer-coated CNWs were used as counter electrodes formanufacturing the DSCCs. The vertical and the surface conditions of the metal-coated CNWsused as the DSCC electrodes were characterized by their electrical variations through field-emissionscanning electron microscopy (FE-SEM) and Hall measurements. Their optical characteristics wereanalyzed using UV-Vis equipment, and the energy conversion efficiencies of the DSSCs manufacturedusing the metal-layer-coated CNWs as the counter electrodes were measured. The results confirmedthat the efficiency improved when the W-coated CNW was used as the counter electrode.
Lee, Sangjoon,Hwang, Wontae Elsevier 2019 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.134 No.-
<P><B>Abstract</B></P> <P>A numerical procedure for conjugate heat transfer (CHT) analysis based on an immersed boundary (IB) method for large eddy simulation (LES) has been developed. The dynamic subgrid-scale (SGS) stress and heat flux models are implemented in the solver. Since discrepancy between the computational grid and solid-fluid interface generally exists, interpolation of thermal properties at the interface is necessary for the current method. Accordingly, an efficient interpolation scheme using the modified flood-fill algorithm is applied. In order to validate the capability of the developed method, three different CHT cases with turbulent flow were examined: channel flow between heated slabs, thermally-driven flow in a closed cavity, and crossflow around a heated circular cylinder. Compared to cases that just utilized an isothermal or constant-heat-flux boundary condition, when the CHT method was properly implemented, results more closely matched experimental data and existing correlations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Immersed-boundary based LES method developed for conjugate heat transfer problems. </LI> <LI> An optimized flood-fill algorithm enhances thermal interpolation performance. </LI> <LI> LES successfully predicted the turbulent flow and thermal characteristics. </LI> <LI> Fluid-solid interaction significantly affects thermal characteristics of the flow. </LI> </UL> </P>
Effect of flexibility on flapping wing characteristics in hover and forward flight
Lee, Namhun,Lee, Seungsoo,Cho, Haeseong,Shin, SangJoon Elsevier 2018 Computers & fluids Vol.173 No.-
<P><B>Abstract</B></P> <P>Wing flexibility affects the flight performance of flapping-wing micro air vehicles. In this paper, we present a computational approach for the aeroelastic analysis of realistic insect-like flexible flapping wings with hovering and forward-flight modes. A three-dimensional preconditioned Navier–Stokes solver is used with a deforming mesh technique for the aerodynamic analysis of a flapping wing. For the structural analysis, co-rotational (CR) finite elements and CR shell elements are used. As seen from the numerical analysis, wing flexibility leads to thrust increments with the increasing flapping frequency. The advance ratio, however, is the cause of the thrust decrease for flexible flapping wings with high flapping-frequency motions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A aeroelastic analysis of a realistic insect-like flexible flapping wing with hovering and forward-flight modes is presented. </LI> <LI> A three-dimensional preconditioned Navier-Stokes solver and a structural solver with co-rotational (CR) finite elements and CR shell elements are used for the aeroelastic analysis. </LI> <LI> The thrust and lift forces of the flexible wing increase as the flapping frequency increases, but they decrease as the advance ratio increases. </LI> </UL> </P>
Long-term endocrine outcome of suprasellar arachnoid cysts
Lee, Ji Yeoun,Lee, Young Ah,Jung, Hae Woon,Chong, Sangjoon,Phi, Ji Hoon,Kim, Seung-Ki,Shin, Choong-Ho,Wang, Kyu-Chang Journal of Neurosurgery Publishing Group 2017 Journal of neurosurgery. Pediatrics Vol.19 No.6
<B>OBJECTIVE</B><P>Due to their distinct location, suprasellar arachnoid cysts are known to cause a wide variety of problems, such as hydrocephalus, endocrine symptoms, and visual abnormalities. The long-term outcome of these cysts has not been elucidated. To find out the long-term outcome of suprasellar arachnoid cysts, a retrospective review of the patients was performed. The neurological and endocrine symptoms were thoroughly reviewed.</P><B>METHODS</B><P>Forty-five patients with suprasellar arachnoid cysts, with an average follow-up duration of 9.7 years, were enrolled in the study. A comprehensive review was performed of the results of follow-up regarding not only neurological symptoms but also endocrine status. The outcomes of 8 patients who did not undergo operations and were asymptomatic or had symptoms unrelated to the cyst were included in the series.</P><B>RESULTS</B><P>Surgery was most effective for the symptoms related to hydrocephalus (improvement in 32 of 32), but endocrine symptoms persisted after surgery (4 of 4) and required further medical management. More surprisingly, a fairly large number of patients (14 of 40; 1 was excluded because no pre- or postoperative endocrine evaluation was available) who had not shown endocrine symptoms at the time of the initial diagnosis and treatment later developed endocrine abnormalities such as precocious puberty and growth hormone deficiency. The patients with endocrine symptoms detected during the follow-up included those in both the operated (n = 12 of 32) and nonoperated (n = 2 of 8) groups who had been stable during follow-up since the initial diagnosis.</P><B>CONCLUSIONS</B><P>This study implies that patients with suprasellar arachnoid cysts can develop late endocrine problems during follow-up, even if other symptoms related to the cyst have been successfully treated. Hence, patients with these cysts need long-term follow-up for not only neurological symptoms but also endocrine abnormalities.</P>
Repositioning disulfiram as a radiosensitizer against atypical teratoid/rhabdoid tumor
Lee, Young Eun,Choi, Seung Ah,Kwack, Pil Ae,Kim, Hak Jae,Kim, Il Han,Wang, Kyu-Chang,Phi, Ji Hoon,Lee, Ji Yeoun,Chong, Sangjoon,Park, Sung-Hye,Park, Kyung Duk,Hwang, Do Won,Joo, Kyeung Min,Kim, Seung- Oxford University Press 2017 Neuro-oncology Vol.19 No.8
<P>Conclusions. DSF and RT combination therapy has additive therapeutic effects on AT/RT by potentiating programmed cell death, including apoptosis and autophagy of AT/RT cells. We suggest that DSF can be applied as a radiosensitizer in AT/RT treatment.</P>