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과학기술위성 3호 다목적 적외선 영상시스템 적외선 우주배경복사 관측 감도 계산
Lee, Dae-Hui,Lee, Seong-Ho,Han, Won-Yong,Park, Jang-Hyeon,Nam, Uk-Won,Jin, Ho,Yuk, In-Su,Park, Yeong-Sik,Park, Seong-Jun,Lee, Hyeong-Mok,Park, Su-Jong,Matsumoto, Toshio,Cooray, Asantha 한국천문학회 2007 天文學論叢 Vol.22 No.4
We present the sensitivity calculation results for observing the Cosmic Infrared Background (CIRB) by the Multi-purpose IR Imaging System (MIRIS), which will be launched in 2010 as a main payload of the Science and Technology Satellite 3 (STSAT-3). MIRIS will observe in I ($0.9{\sim}1.2um$) and H ($1.2{\sim}2.0um$) band with a $4{\times}4$ degree field of view to obtain the large scale structure (${\sim}3$ degree) of the CIRB. With the given specifications of the MIRIS, our sensitivity calculation results show that the MIRIS has a detection limit of ${\sim}9\;nW\;m^{-2}\;sr^{-1}$ (I band) and ${\sim}6\;nW\;m^{-2}\;sr^{-1}$ (H band), which is appropriate to observe the large scale structure of CIRB.
Lee Yun Gyu,Lee Hyeong Uk,Lee Jae Min,Kim Na Young,Jeong Dong Hwi 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.1
To successfully attain the objective of carbon neutrality, the active incorporation of carbon capture utilization (CCU) technology becomes imperative within the engineering framework. This technology facilitates the generation of high value-added materials by harnessing carbon dioxide, sourced from either the atmosphere or industrial processes, as a fundamental raw material. Dimethyl carbonate (DMC) is an environmentally friendly chemical that can be produced using CCU technology. This study fi rst models the base process of the ethylene carbonate (EC) transesterifi cation method that produces DMC based on carbon dioxide, ethylene oxide (EO), and methanol (MeOH). Based on this, three processes for recycling by-products, ethylene glycol (EG) and EC, are proposed, and economic analysis and overall environmental impact evaluation are conducted. Each process is modeled through Aspen Plus V12.1, economic feasibility is evaluated through Aspen Process Economic Analyzer (APEA), and environmental impact is evaluated through OpenLCA. As a result, the fi nal DMC production is increased by 0.644–18.9% compared to the base process in the process of recycling by-products. In the base process, the net present value (NPV) and payback period (PBP) were 46 M$ and 8.3 years, respectively, and in the proposed 1 (recycling EG) and proposed 3 (recycling EG and EC) processes, the NPV was 231 M$ and 73 M$, respectively, and the PBP was 3.8 and 7.4 years, respectively. In the proposed 2 process (with EC recycling), a substantial negative net present value (NPV) of − 135 M$ was observed, indicating that recovering the investment cost was unfeasible within this scenario. Through sensitivity analysis, it was shown that the parameters with high volatility of NPV are DMC price and raw material cost. Finally, the result for climate change among the environmental impact categories is 3.85 kgCO2−eq in the base process, 3.47 kgCO2−eq in the proposed 1 process, 3.57 kgCO2−eq in the proposed 2 process, and 3.33 kgCO2−eq in the proposed 3 process, respectively.
Lee, Hyeong-Hoon,Ahn, Sook-Hyun,Nam, Byong-Uk,Kim, Byeong-Soo,Lee, Gang-Woo,Moon, Donghyun,Shin, HyungJoon,Han, Kyu Won,Yoon, Ji-Ho AmericanChemical Society 2012 Environmental science & technology Vol.46 No.7
<P>Landfill gas (LFG), which is primarily composed of CH<SUB>4</SUB>, CO<SUB>2</SUB>, and N<SUB>2</SUB>, is produced from theanaerobicdigestion of organic materials. To investigate the feasibility ofthe storage and transportation of LFG via the formation of hydrate,we observed the phase equilibrium behavior of CO<SUB>2</SUB>–CH<SUB>4</SUB>–N<SUB>2</SUB> mixture hydrates. When the specificmolar ratio of CO<SUB>2</SUB>/CH<SUB>4</SUB> was 40/55, the equilibriumdissociation pressures were gradually shifted to higher pressuresand lower temperatures as the mole fraction of N<SUB>2</SUB> increased.X-ray diffraction revealed that the CO<SUB>2</SUB>–CH<SUB>4</SUB>–N<SUB>2</SUB> mixture hydrate prepared from the CO<SUB>2</SUB>/CH<SUB>4</SUB>/N<SUB>2</SUB> (40/55/5) gas mixture formed a structureI clathrate hydrate. A combination of Raman and solid-state <SUP>13</SUP>C NMR measurements provided detailed information regarding the cageoccupancy of gas molecules trapped in the hydrate frameworks. Thegas storage capacity of LFG hydrates was estimated from the experimentalresults for the hydrate formations under two-phase equilibrium conditions.We also confirmed that trace amounts of nonmethane organic compoundsdo not affect the cage occupancy of gas molecules or the thermodynamicstability of LFG hydrates.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2012/esthag.2012.46.issue-7/es203389k/production/images/medium/es-2011-03389k_0005.gif'></P>
( Muyeol Lee ),( Dong-geon Lee ),( Yujin Yang ),( Dae Hyun Kim ),( Bo Sik Choi ),( Hyeong Uk Ju ),( Neung Hwa Park ),( Byung Uk Lee ),( Jae Ho Park ),( Seok Won Jung ),( In Du Jeong ),( Sung-jo Bang ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Daclatasvir/asunaprevir (D/A) combination therapy has approved as a first interferon free oral regimen for chronic hepatitis C in Korea. D/A combination therapy has shown a high virological response for chronic genotype 1 hepatitis C virus (HCV) infected patients in clinical trials and real world data of Japanese. In the present study, we analyzed the real world efficacy and the safety of D/A combination therapy for patients with (HCV) in metropolitan city Ulsan. Methods: We retrospectively analyzed clinical data of chronic HCV genotype Ib patients treated with D/A combination therapy at five hospitals in the metropolitan city Ulsan. Of 146 patients treated with D/A combination therapy, 117 patients completed treatment were included in safety and efficacy analysis. Results: D/A combination therapy was the first-line treatment for 64 (54.7%) patients. 44 (37.6%) patients were null responders or relapsers of previous interferon treatment and nine patients (7.7%) were found to be intolerant of interferon. Fifty two (44.4%) patients exhibited cirrhotic change. Sustained virologic response at 12 weeks (SVR 12) rate was 90.6% (106//117) overall, 93.87% the treatment- naive group, 86.4% in the treatment-failure group, and 88.9% in the treatment-intolerant group. SVR12 rates for patients with and without cirrhosis were 86.5% and 93.8%, respectively (p>0.05). SVR was achieved in 89.2 % of patients aged order 65 years and 92.4 % of younger 65 years. There was no significant difference in SVR12 rate (86.2% vs 97.8%) between high viral load (HCV RNA > 80,000 IU/mL) group and low viral load group. Adverse treatment-related events were reported in 00 (17.1%). One patient stopped drug due to severe general weakness and died from aspiration pneumonia. Conclusions: D/A combination therapy combination treatment should be considered as a safe and effective treatment option for genotype 1 HCV-infected patient.
급변온도 변이에 따른 양파의 생리적 특성 및 수량 변화
이형진 ( Hyeong Jin Lee ),한효심 ( Hyo Shim Han ),천상욱 ( Sang Uk Chon ),김동관 ( Dong Kwan Kim ),권현숙 ( Hyun Sook Kwon ),이경동 ( Kyung Dong Lee ) 한국환경농학회 2014 한국환경농학회지 Vol.33 No.4
BACKGROUND: To evaluate the impact of rapid temperature change at spring and the early summer seasons in climate change, we have investigated the physiological response and yield of onion in a greenhouse with thermostat control system. METHODS AND RESULTS: Seedlings of onion(cv. Sunshine) were planted on October 30, 2012 and harvested on May 30, 2013. The used treatments(March-April-May) for a rapid temperature change were T0(control): 6.0-10.4-17.2℃, T1: 6.0-5.4(-5)-17.2℃, T2: 6.0-10.4-22.2 (+5)℃ and T3: 6.0-5.4(-5)-22.2(+5)℃. Total yields of bulb within the temperature change as high temperature treatment T2 and control treatment T0 were increased significantly(p<0.05), as compared to the low temperature treatment T1. Low temperature conditions significantly (p<0.05) reduced plant height, SPAD reading, crude protein and fiber etc., as compared to the TO and T2. CONCLUSION: The rapid temperature changes werehighly affected by low temperature than high temperature. These results suggest that rapid climate change of future could need systematic standard model for physiological characteristics and yields of onion.
( So Yeon Lee ),( Yoon Seok Choi ),( Bhum-suk Keam ),( Keon-uk Park ),( Ki-hyeong Lee ),( Ihn-seong Jo ),( Eun-kee Song ),( Sang-gon Park ),( Ik-chan Song ),( Hyo Jin Lee ),( Deog Yeon Jo ),( Samyong 대한내과학회 2016 대한내과학회 추계학술발표논문집 Vol.2016 No.1
Introduction: Standard treatment for locally advanced (stage III-IV) head and neck squamous cell cancer (LA-HNSCC) is concurrent chemoradiation therapy (CCRT) with cisplatin 100mg/m2 every three weeks. For medically unfit patients susceptible to treatment-related adverse events, low-dose weekly cisplatin can be used as an alternative. In previous studies, weekly cisplatin-based regimen showed fair efficacy and tolerable toxicity profiles. In this study, we retrospectively compared the therapeutic outcomes of low-dose weekly cisplatin regimen and standard regimen in CCRT for LA-HNSCC.?Methods: The medical records of histologically confirmed LA-HNSCC patients were retrospectively reviewed from Jan 1, 2007 to Dec 31, 2012. 224 patients who were treated with CCRT as initial treatment were enrolled. Among them, 155 patients were treated with low-dose (30 mg/m2) weekly cisplatin and 69 patients were treated with standard-dose (100 mg/m2) three-weekly. Dose intensity of cisplatin in each group was calculated as proportion of delivered dose in full regimen dosage.?Results: Baseline characteristics of both groups did not differ significantly, except that standard-dose group contained more larynx cancer patients. Although dose intensity of standard-dose cisplatin group (84%) were lower than low-dose weekly cisplatin group (91%), difference in median progression free survival (31.2 month vs 26.3 month; p=0.469) and overall survival (36.6 month vs 31.6 month; p=0.439) was not statistically significant between standard-dose group and low-dose group.?Conclusions: In the present study, low-dose weekly cisplatin was not inferior to standard-dose cisplatin in terms of survival outcomes. Prospective comparison of standard-dose three-weekly and low-dose weekly cisplatin is warranted.