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.

Introduction of co-additives to form well dispersed photoactive layer to improve performance and stability of organic solar cells

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>

Keratosis Lichenoides chronica: Marked Response to Diavonex Cream

( Eui Chang Jung ),( Sung Eun Chang ),( Jee Ho Choi ),( Kyung Jeh Sung ),( Kee Chan Moon ),( Jai Kyoung Koh ) 대한피부과학회 1998 초록집 Vol.36 No.20

Development of large-scale and economic pH control system for outdoor cultivation of microalgae <i>Haematococcus pluvialis</i> using industrial flue gas

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>

Assessment of Soil Moisture Variability by Forest Type Using the WRF-Hydro Model

Eui-Sang Jeong,Hong-Lae Cho,Byoung-Ki Choi 한국산림공학회 2025 한국산림공학회 학술대회 Vol.2025 No.06

This study analyzed the spatial distribution characteristics of soil moisture content by forest type in the upper Nakdong River Basin (Yeongju and Bonghwa regions) using the WRF-Hydro hydrological model. The model was constructed based on a 30 m × 30 m regular grid structure, with the soil profile divided into four layers. Land cover-specific parameters such as maximum canopy interception capacity per unit area, canopy height, vegetation density, rooting depth, monthly leaf area index, and monthly stem area index were assigned. Soil parameters, including pore distribution, saturated soil moisture content, and saturated hydraulic conductivity, were calibrated according to regional characteristics. Meteorological input data were derived from the Korea Meteorological Administration and Korea Forest Service weather observation networks, quality-controlled, and spatially interpolated using the inverse distance weighting (IDW) method to generate high-resolution input datasets. Model calibration and validation were conducted using forest flow and streamflow observations from 2021. The simulation results showed distinct spatial and temporal differences in soil moisture distribution among forest types. Coniferous forests generally maintained lower soil moisture contents, whereas broadleaf forests exhibited higher soil moisture levels, with mixed forests demonstrating intermediate characteristics. This study provides fundamental data for analyzing hydrological characteristics by forest type using forest hydrological modeling and is expected to contribute to future research on forest water resource management, forest disaster risk management, and climate change adaptation.

High-efficiency cell disruption and astaxanthin recovery from <i>Haematococcus pluvialis</i> cyst cells using room-temperature imidazolium-based ionic liquid/water mixtures

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>

Robotic Central Pancreatectomy: Surgical Technique

Eui Hyuk Chong,Kwang Hyun Kim,Jae Young Jang,Seok Jeong Yang,Incheon Kang,Sung Hwan Lee,Sung Hoon Choi 대한외과학회 2022 대한외과학회 학술대회 초록집 Vol.2022 No.11

Associations among the Duodenal Ecosystem, Gut Microbiota, and Nutrient Intake in Functional Dyspepsia

( Sang Hoon Kim ),( Yura Choi ),( Jihong Oh ),( Eui Yeon Lim ),( Jung Eun Lee ),( Eun-ji Song ),( Young-do Nam ),( Hojun Kim ) 대한소화기기능성질환·운동학회 2024 Gut and Liver Vol.18 No.4

Background/Aims: Functional dyspepsia (FD) has long been regarded as a syndrome because its pathophysiology is multifactorial. However, recent reports have provided evidence that changes in the duodenal ecosystem may be the key. This study aimed to identify several gastrointestinal factors and biomarkers associated with FD, specifically changes in the duodenal ecosystem that may be key to understanding its pathophysiology. Methods: In this case-control study, 28 participants (12 with FD and 16 healthy control individuals) were assessed for dietary nutrients, gastrointestinal symptom severity, immunological status of the duodenal mucosa, and microbiome composition from oral, duodenal, and fecal samples. Integrated data were analyzed using immunohistochemistry, real-time polymerase chain reaction, 16S rRNA sequencing, and network analysis. Results: Duodenal mucosal inflammation and impaired expression of tight junction proteins were confirmed in patients with FD. The relative abundance of duodenal Streptococcus (p=0.014) and reductions in stool Butyricicoccus (p=0.047) were confirmed. These changes in the gut microbiota were both correlated with symptom severity. Changes in dietary micronutrients, such as higher intake of valine, were associated with improved intestinal barrier function and microbiota. Conclusions: This study emphasizes the relationships among dietary nutrition, oral and gut microbiota, symptoms of FD, impaired function of the duodenal barrier, and inflammation. Assessing low-grade inflammation or increased permeability in the duodenal mucosa, along with changes in the abundance of stool Butyricicoccus, is anticipated to serve as effective biomarkers for enhancing the objectivity of FD diagnosis and monitoring.

[Surgical Oncology] Short-term Outcomes of Radical Surgery after nab-Paclitaxel Plus Gemcitabine-cisplatin Chemotherapy in Patients with Locally Advanced Perihilar Cholangiocarcinoma

Eui Hyuk Chong,Kwang Hyun Kim,Seok Jeong Yang,Incheon Kang,Sung Hwan Lee,Sung Hoon Choi 대한외과학회 2022 대한외과학회 학술대회 초록집 Vol.2022 No.11