FUEL SWITCHING TO BIOLIQUID IN COMMERCIAL OIL-FIRED POWER PLANTS

Jongkeun Park,Mukyeong Kim,Changkook Ryu,Sehyun Baek,Youngju Kim,Hoyoung Park,Sangbin Park 한국신재생에너지학회 2015 AFORE Vol.2015 No.11

Reaction between Gas-phase Hydrogen Atom and Chemisorbed Bromine Atoms on a Silicon(001)-(2?1) Surface

Jongkeun Park,Jongbaik Ree*,Sang Kwon Lee,김유항 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.12

The reaction between gas-phase atomic hydrogen and highly covered chemisorbed bromine atoms on a silicon(001)-(21) surface is studied by use of the classical trajectory approach. The model is based on reaction zone consisting of H, Br and Si atom interacting with a finite number of primary system silicon atoms, which are coupled to the heat bath. The calculations were carried out in the temperature range 300-2500 K for the gaseous H atom and 0-700 K for the surface, respectively. All reactive events occur in a single impact collision on a subpicosecond scale, following the Eley-Rideal mechanism. The reaction probability is dependent upon the gas temperature and the largest near 800 K, but it is essentially independent of the surface temperature. The reaction energy available for the product state is small, and most of the reaction exothermicity deposits in vibration and translation of the product, HBr molecule.

Gene-gene interaction analysis identifies a new genetic risk factor for colorectal cancer

Park, Jongkeun,Kim, Injung,Jung, Keum Ji,Kim, Soriul,Jee, Sun Ha,Yoon, Sungjoo Kim BioMed Central 2015 Journal of biomedical science Vol.22 No.1

<P><B>Background</B></P><P>Adiponectin levels have been shown to be associated with colorectal cancer (CRC). Furthermore, a newly identified adiponectin receptor, T-cadherin, has been associated with plasma adiponectin levels. Therefore, we investigated the potential for a genetic association between T-cadherin and CRC risk.</P><P><B>Result</B></P><P>We conducted a case–control study using the Korean Cancer Prevention study-II cohort, which is composed of 325 CRC patients and 977 normal individuals. Study results revealed that <I>rs3865188</I> in the 5’ flanking region of the T-cadherin gene (<I>CDH13</I>) was significantly associated with CRC (<I>p</I> = 0.0474). The odds ratio (OR) for the TT genotype as compared to the TA + AA genotype was 1.577 (<I>p</I> = 0.0144). In addition, the interaction between <I>CDH13</I> and the adiponectin gene (<I>APN</I>) for CRC risk was investigated using a logistic regression analysis. Among six <I>APN</I> single nucleotide polymorphisms (<I>rs182052</I>, <I>rs17366568</I>, <I>rs2241767</I>, <I>rs3821799</I>, <I>rs3774261</I>, and <I>rs6773957</I>)<I>,</I> an interaction with the <I>rs3865188</I> was found for four (<I>rs2241767</I>, <I>rs3821799</I>, <I>rs3774261</I>, and <I>rs6773957</I>). The group with combined genotypes of TT for <I>rs3865188</I> and GG for <I>rs377426</I> displayed the highest risk for CRC development as compared to those with the other genotype combinations. The OR for the TT/GG genotype as compared to the AA/AA genotype was 4.108 (<I>p</I> = 0.004). Furthermore, the plasma adiponectin level showed a correlation with the gene-gene interaction, and the group with the highest risk for CRC had the lowest adiponectin level (median, 4.8 μg/mL for the TT/GG genotype vs.7.835 μg/mL for the AA/AA genotype, <I>p</I> = 0.0017).</P><P><B>Conclusions</B></P><P>The present study identified a new genetic factor for CRC risk and an interaction between <I>CDH13</I> and <I>APN</I> in CRC risk. These genetic factors may be useful for predicting CRC risk.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/s12929-015-0180-9) contains supplementary material, which is available to authorized users.</P>

경량골재 로타리킬른의 운전최적화를 위한 석탄연소 및 원료입자 승온특성 해석

박종근(JongKeun Park),류창국(ChangKook Ryu),김영주(YoungJu Kim) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.5

Bottom ash from a coal-fired power plant is currently landfilled to a , which causes a growing environmental concern and increased operating costs. One way of recycling the bottom ash is to produce light weight aggregate (LWA) using a rotary kiln. This study investigated the temperature profiles of raw LWA particles in a rotary kiln to identify the range of feasible operating conditions. The effects of air preheating and excess air ratio were analyzed using integrated simulations using a 1-dimensional model for the bed of LWA particles and computational fluid dynamics (CFD) for the gas flow. The results shows that, in order to attain a peak temperature of 1100 ℃ for LWA particles, the ideal air temperature required from LWA cooling process is about 700 ℃ at an excess air ratio of 150%. If the air is independently preheated to 150 ℃, excess air should be reduced to about 50% to achieve the appropriate peak temperature.

산업폐기물 소각로의 FGR에 따른 NOx 배출특성에 대한 전산해석 연구

박종근(Jongkeun Park),류창국(Changkook Ryu),이용운(Yongwoon Lee),박진제(Jinje Park),이영재(Youngjae Lee) 한국열환경공학회 2021 한국열환경공학회 학술대회지 Vol.2021 No.-

폐플라스틱 펠릿의 고정층 연소 시 우드펠릿 혼소율에 따른 화염전파 특성 연구

박정근(Jongkeun Park),유승한(Seunghan Yu),김희윤(Heeyoon Kim),류창국(Changkook Ryu),김종현(Jonghyun Kim),이재하(Jaeha Lee),허준(Joon Heo) 한국연소학회 2021 KOSCOSYMPOSIUM논문집 Vol.2021 No.11

One option for disposal of marine waste plastics is pelletization and combustion for energy recovery. In a fixed bed which is commonly applied for waste combustion, however, it is difficult for plastic pellets to achieve stable and continous propagation of ignition front from the surface to the bottom of the bed because of melting and subsequent blockage of air passages. In this study, the cofiring of wood pellets was investigated for successful fixed bed combustion of plastic pellets at different cofiring ratios and air flow rates. It was found that the steady propagation of the ignition front can be achieved by cofiring at least 20 wt% of wood pellets. The burning rate was approximately 105 kg/m2h, which is useful to determine the minimum area required for a moving grate.

시설별 안전점검 중복성에 대한 실태조사 및 개선방안 연구

박종근 ( Jongkeun Park ),오태근 ( Tae Keun Oh ) 한국안전학회(구 한국산업안전학회) 2017 한국안전학회지 Vol.32 No.1

Safety inspection activities of the facilities including the electricity, gas, building, and firefighting, etc. are individual checks by the separate law of each government department, comprehensive inspections for the specific managed facilities or during a weak season, and national safety overall diagnostics for the disaster prevention. Thus, types of the inspections are various and they have been carried out repeatedly as well as duplicately. That can make the people or institutes to take such inspections feel great burdens. Therefore, the investigation on the current situation of the individual inspection by the separate law for the electricity, gas, building, and firefighting, etc. as well as of various others by the government needs to be carried out and according to the results the repetitive and duplicated inspections should be reduced and converged to one comprehensive one. In this regard, we proposed solutions to improve the government safety inspection system, function, and role.

Mutalisk: a web-based somatic MUTation AnaLyIS toolKit for genomic, transcriptional and epigenomic signatures

Lee, Jongkeun,Lee, Andy ,Jinseok,Lee, June-Koo,Park, Jongkeun,Kwon, Youngoh,Park, Seongyeol,Chun, Hyonho,Ju, Young Seok,Hong, Dongwan Oxford University Press 2018 Nucleic acids research Vol.46 No.w1

<P><B>Abstract</B></P><P>Somatic genome mutations occur due to combinations of various intrinsic/extrinsic mutational processes and DNA repair mechanisms. Different molecular processes frequently generate different signatures of somatic mutations in their own favored contexts. As a result, the regional somatic mutation rate is dependent on the local DNA sequence, the DNA replication/RNA transcription dynamics and epigenomic chromatin organization landscape in the genome. Here, we propose an online computational framework, termed Mutalisk, which correlates somatic mutations with various genomic, transcriptional and epigenomic features in order to understand mutational processes that contribute to the generation of the mutations. This user-friendly tool explores the presence of localized hypermutations (<I>kataegis</I>), dissects the spectrum of mutations into the maximum likelihood combination of known mutational signatures and associates the mutation density with numerous regulatory elements in the genome. As a result, global patterns of somatic mutations in any query sample can be efficiently screened, thus enabling a deeper understanding of various mutagenic factors. This tool will facilitate more effective downstream analyses of cancer genome sequences to elucidate the diversity of mutational processes underlying the development and clonal evolution of cancer cells. Mutalisk is freely available at http://mutalisk.org.</P>

열분해 합성가스의 간헐적 주입이 혐기성소화 효율에 미치는 영향

이종근(Jongkeun Lee),박영호(Youngho Park),박기영(Ki Young Park) 한국환경에너지공학회 2022 한국열환경공학회 학술대회지 Vol.2022 No.1

본 연구에서는 수소 함량이 높은 합성가스를 혐기성소화조로 직접 주입함으로써 in-situ 바이오가스 업그레이드 기술을 모사하는 회분식 혐기성소화조를 운영하고, 폐바이오매스 열분해 공정과의 연계 측면을 고려하여 열분해 합성가스의 조성과 주입 방식이 바이오가스 수율 변화에 미치는 영향을 확인하고자 하였다. 선행연구를 통해 수소 함량이 높고 바이오가스 업그레이드에 유리한 슬러지 열분해 합성가스 생산 조건(800℃, 30 min)을 확인 후 실험 설계 기초자료로 활용하였으며, 이때 생산되는 열분해 합성가스 조성을 중심으로 주요 물질인 수소와 에틸렌 함량을 변화시키며 각각의 성분 함량과 간헐적 주입 여부가 혐기성 미생물 대사활동에 미치는 영향을 중점적으로 확인하였다. 실험 결과 합성가스에 포함된 수소는 바이오가스 중 메탄 함량 증가에 영향을 미쳤지만, 에틸렌의 경우 가역적으로 혐기성 미생물의 대사활동에 저해 요소로서 작용한 것을 함께 확인할 수 있었다. 결국 폐바이오매스 열분해를 통한 합성가스의 생산과 합성가스를 혐기성소화조로 주입하는 바이오가스 업그레이드 연계 공정의 설계가 가능할 것으로 판단되지만, 합성가스 중 포함될 수 있는 에틸렌이 바이오가스 수율 향상에 가역적인 저해요소로 작용할 수 있음을 반드시 고려할 필요가 있다.

전기화학적인 공정을 이용한 혐기성 소화액의 질소제거 성능평가

박진세 ( Jinse Park ),이종근 ( Jongkeun Lee ),차호영 ( Hoyoung Cha ),이관용 ( Kwanyong Lee ),박기영 ( Ki Young Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 심포지움 Vol.2016 No.2

대표적인 유기성폐기물 중 하나인 가축분뇨는 주로 혐기성소화 공정을 이용하여 처리되며, 이때 최종 처분을 필요로 하는 유기물의 양이 감소되고 공정의 부산물로는 바이오가스 형태의 에너지가 생산되는 것으로 알려져 있다. 가축분뇨의 혐기성소화는 이와 같은 장점을 갖는 공정임에도 불구하고 소화 공정 이후 유출수 내 포함된 고농도의 질소는 공정 외부로 배출됨과 동시에 반드시 이의 처리가 수반되어야 하는 단점을 수반한다. 따라서 기존의 혐기성소화 공정들은 다양한 물리·화학적 처리 프로세스를 혐기성소화 공정과 연계하여 유출수 내 포함된 질소를 제거하기도 한다. 하지만 일반적인 물리·화학적인 질소제거 공정들은 안정적인 유출수질의 확보가 어렵고, 처리시설을 운전하는데 고도의 숙련도를 갖춘 운전인력이 확보되어야 하며 초기 설비비 및 운전비가 높아 현장 적용에 어려움을 겪고 있다. 물리·화학적 질소 처리 공정과 함께 유출수 내 질소를 직접적으로 재활용하기 위한 방안으로 혐기성소화 유출수의 액비화를 통한 액비 생산이 소개되고 있으나 이 역시 수요와 공급의 불일치 및 액비화에 필요한 거대한 부지의 소요 등과 같은 문제점들로 인해 액비화의 실효성에 의문이 제기된다. 최근 기존 질소처리 또는 자원화 공정의 대체방법으로서 전기화학적 방법을 이용한 혐기성소화 유출수 내 질소처리에 관한 연구가 소개되고 있다. 전기화학적 방법을 이용한 질소처리 공정은 양극(anode)에서의 직접적인 산화와 유출수내 염소이온(Cl-)을 산화시켜 만들어진 잔류염소로 암모니아를 산화시키는 간접적인 산화를 거쳐 이루어진다. 본 연구에서는 가축분뇨의 혐기성소화 이후 발생되는 유출수 내 질소의 처리를 위해 불용성 전극을 사용하여 혐기성 소화 유출수를 산화시키고 암모니아성 질소를 효율적으로 제거하는 방법에 대한 연구를 수행하였다.