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Primary intraosseous carcinoma of the mandible
Hwang, Eui-Hwan,Choi, Yong-Suk,Lee, Sang-Rae 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.4
A very uncommon tumor, primary intraosseous carcinoma (PIOC), is a carcinoma arising within the jaw. The definite diagnosis of PIOC is often difficult as the lesion must be distinguished from alveolar carcinoma that may invade the bone from the overlying soft tissues or from the tumors that have metastasized to the jaw from a distant site. A case of PIOC arising in the mandible is presented. The clinical, radiologic, and histologic features are described. This rare lesion should be considered in any differential diagnosis of a jaw radiolucency.
강원,경북지역 낙엽송 지위지수 적합성 평가에 관한 연구
이대성 ( Dae Sung Lee ),이의섭 ( Eui Sub Lee ),최종현 ( Jong Hyun Choi ),서영완 ( Yeong Wan Seo ),최정기 ( Jung Kee Choi1 ) 한국임학회 2014 산림과학 공동학술대회 논문집 Vol.2014 No.-
본 연구는 강원 및 경북지역의 낙엽송 지위지수의 적합도를 평가하기 위해 실시되었다. 연구자료는 강원 및 경북지역의 45개 낙엽송 인공림 표준지 조사로부터 우세목 1본을 선발하여 수간석 해를 통해 분석되었다. 산림청에서 개발된 지위지수표에 의거하여 본 연구대상지의 지위지수를 산정한 결과, 지위지수가 18 이하로 낮은 지역은 8곳(18%)이었으며, 지위지수가 20 이상으로 우수한 지역이 37곳(82%)으로서 대부분 지역에서 지위지수가 우세하였다. 지위지수곡선의 적합도를 평가하기위해 수간석해목의 과거에서 현재까지의 수고생장에 따른 지위지수의 변화를 도시한 결과, 초기 임령 때 지위지수와 차이가 없는 곳은 단지 8지역(18%)이었으며, 지위지수가 2∼4 m 차이가 발생한 지역이 19곳(42%), 6 m 이상 발생한 지역이 18곳(40%)으로 나타났다. This study was performed to evaluate the compatibility of site index for Larix kaempferi in Gangwon and Kyeongbuk regions. The data were collected and analyzed from stem alalysis of one dominant tree at each of 45 permanent plots installed in the regions. The result of site index estimation following the site index table developed by Korean Forest Service (KFS) showed that 8 plots (18%) were less than site index 18 and 37 plot (82%) greater than site index 20. Height growth changes of stemmed trees until present were illustrated in a graphic form to evaluate the compatibility of site index curve. The result showed that only 8 plots (18%) did not show any change of site index as trees age, 19 plots (42%) fluctuated in 2∼4m and 18 plots (40%) over 6m.
Choi, Jun Young,Han, Yong Woon,Jeon, Sung Jae,Ko, Eui Jin,Moon, Doo Kyung Elsevier 2019 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.185 No.-
<P><B>Abstract</B></P> <P>We fabricated organic solar cells (OSCs) based on bulk-heterojunction photoactive layers with fullerene (PTB7:PC<SUB>71</SUB>BM) and non-fullerene (PBDB-T:ITIC) systems by introducing 1,8-diiodooctane (DIO) and 4-fluorobenzaldehyde (4-FBA) as co-additives, respectively. Introduction of the co-additives led to a uniform surface morphology of photoactive layer and formed well distributed interpenetrating networks between donors and acceptors. Carrier recombination were reduced due to the favorable structure for charge transport. Consequently, the devices with co-additives achieved an enhanced performance with a PCE of 8.5% (J<SUB>SC</SUB> = 16.4 mA/cm<SUP>2</SUP> and FF = 68.3%) in the fullerene system, and a PCE of 10.1% (J<SUB>SC</SUB> = 16.9 mA/cm<SUP>2</SUP> and FF = 67.8%) in the non-fullerene system. In addition, the devices with co-additives showed improved stabilities compared to those with single additives. Correspondingly, the reduction ratio of PCE at ambient atmosphere conditions decreased from 17.07% to 10.59% in the fullerene system, and 34.02% to 24.75% in the non-fullerene system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 4-Fluorobenzaldehyde used as co-additives in the fullerene and non-fullerene systems. </LI> <LI> Co-additives allowed the formation of a well-distributed molecular order. </LI> <LI> Co-additives formed more favorable structure for charge transport. </LI> <LI> Co-additives maintained the phase by preventing aggregation. </LI> <LI> The device with co-additives exhibit more stable at ambient atmosphere conditions. </LI> </UL> </P>
Choi, Sun-A,Oh, You-Kwan,Lee, Jiye,Sim, Sang Jun,Hong, Min Eui,Park, Ji-Yeon,Kim, Min-Sik,Kim, Seung Wook,Lee, Jin-Suk Elsevier 2019 Bioresource technology Vol.274 No.-
<P><B>Abstract</B></P> <P>Energy-saving, high-efficiency cell disruption is a critical step for recovery of thermolabile antioxidant astaxanthin from <I>Haematococcus pluvialis</I> cyst cells of rigid cell-wall structure. In this study, as room-temperature green solvents, 10 types of 1-ethyl-3-methylimidazolium ([Emim])-based ionic liquids (ILs) were compared and evaluated for their abilities to disrupt <I>H. pluvialis</I> cyst cells for astaxanthin/lipid extraction. Among the 10 ILs tested, 3 [Emim]-based ILs with HSO<SUB>4</SUB>, CH<SUB>3</SUB>SO<SUB>3</SUB>, and (CF<SUB>3</SUB>SO<SUB>2</SUB>)<SUB>2</SUB>N anions were selected based on astaxanthin/lipid extraction performance and synthesis cost. When pretreated with IL/water mixtures, intact cyst cells were significantly torn, broken or shown to release cytoplasmic components, thereby facilitating subsequent separation of astaxanthin/lipid by hexane. However, excess IL pretreatments at high temperature/IL dosages and longer incubation times significantly deteriorated lipid and/or astaxanthin. Under optimized mild conditions (6.7% (v/v) IL in water solution, 30 °C, 60 min), almost complete astaxanthin recoveries (>99%) along with moderate lipid extractions (∼82%) could be obtained.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Comparison of imidazolium ionic liquids (ILs) for disruption of <I>H. pluvialis</I> cyst. </LI> <LI> Co-extraction of lipid and astaxanthin using room-temperature IL/water mixtures. </LI> <LI> Very high astaxanthin recoveries (>99%) by IL pretreatments and hexane extractions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Performance and potential appraisal of various microalgae as direct combustion fuel
Choi, Hong Il,Lee, Jeong Seop,Choi, Jin Won,Shin, Ye Sol,Sung, Young Joon,Hong, Min Eui,Kwak, Ho Seok,Kim, Chan Young,Sim, Sang Jun Elsevier 2019 Bioresource technology Vol.273 No.-
<P><B>Abstract</B></P> <P>Direct combustion of biomass is considered the most effective and simple means to contribute to CO<SUB>2</SUB> reduction. In this context, the life-cycle potential of microalgal solid fuel, which has been overlooked so far, was comprehensively scrutinized ranging from cultivation to direct combustion. According to the quantitative data, using the raw fuel was confirmed to offer great benefits over the conventional lipid-targeted microalgal fuel systems through exploiting all of the biomass’ energy potential, thereby being able to significantly increase the energy yield from biomass. The solid fuel is shown to exhibit diverse positive aspects owing to its remarkable calorific value, productivity and CO<SUB>2</SUB> fixation ability. The combustion test reveals coal-microalgae co-combustion brings beneficial consequences on combustibility and environmental impacts with no notable thermal efficiency drop. This holistic appraisal shows microalgae patently possess high potential as a direct combustion fuel, even outperforming that of extensively used woody fuels.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Direct combustion realizes the full potential energy yield from microalgal biomass. </LI> <LI> Microalgae’s oleaginous property contributes to their high calorific values. </LI> <LI> Their high carbon content increases the energy density and CO<SUB>2</SUB> reduction effects. </LI> <LI> Synergistic effects of coal-microalgae co-firing were quantitatively confirmed. </LI> <LI> The solid fuel shows better performance than woody biomass in various properties. </LI> </UL> </P>
Choi, Yoon Young,Joun, Jae Min,Lee, Jeewon,Hong, Min Eui,Pham, Hoang-Minh,Chang, Won Seok,Sim, Sang Jun Elsevier 2017 Bioresource technology Vol.244 No.2
<P><B>Abstract</B></P> <P>The aim of this study was to develop the economic and effective buffer system for microalgae mass cultivation using industrial flue gas. Due to the continuous flue gas supplement, culture media acidified, therefore cell growth inhibited. Although buffering agent was added, this result increase in cost for overall culture process. Therefore combined buffer system of bicarbonate and phosphate (BP) for large-scale use was investigated. The bicarbonate buffer system generated from CO<SUB>2</SUB> dissolution, additionally phosphate buffer system improves the buffer performance under the continuous CO<SUB>2</SUB> supplementation from flue gas. The microalgae <I>Haematococcus pluvialis</I> was cultivated under autotrophic outdoor conditions using these buffer solutions. As a result, the autotrophic BP buffer system enhanced the biomass and astaxanthin productivity of <I>H. pluvialis</I> to 105% and 103%, respectively. The results confirm that the BP buffer system reduces the cost of microalgal CO<SUB>2</SUB> conversion process, particularly for the outdoor mass cultivation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cost-effective bicarbonate/phosphate (BP) buffer system was developed. </LI> <LI> BP buffer showed stable buffer capacity under high concentration of 10% CO<SUB>2</SUB> gas. </LI> <LI> <I>H. pluvialis</I> showed maximal growth rate under conditions of BP buffer at 0.1M KOH. </LI> <LI> BP buffer was comparable to HEPES for astaxanthin production by <I>H. pluvialis</I>. </LI> <LI> Reliable autotrophic mass cultivation of <I>H. pluvialis</I> was achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>