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연소응용 기술 : Helmholtz solver를 이용한 연소불안정 예측 기법 소개
임재영 ( Jaeyoung Lim ),김대식 ( Deasik Kim ),김성구 ( Seong-ku Kim ),차동진 ( Dong Jin Cha ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
Lean premixed combustion system has been used to meet strengthened NOx emission regulations. However, it can be easily affected by combustion instability. This paper introduces a FEM(Finite Element Method)-based Helmholtz solver developed to predict numerically longitudinal combustion instability. The results such as complex valued eigenfrequency and acoustic pressure field can predict resonant frequency, growth rate and modal shape for acoustic modes.
국부 화염전달함수 모델링과 Helmholtz solver를 이용한 연소불안정 해석
임재영(Jaeyoung Lim),표영민(Youngmin Pyo),김성구(Sung-Ku Kim),차동진(Dong Jin Cha),김대식(Daesik Kim) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
대부분의 열음향 모델은 얇은 화염면을 가정하고 해석하기 때문에 이러한 과도한 화염장의 단순화로부터 정의된 모델의 예측값은 실험 결과와 비교할 때, 무시할 수 없는 오차가 존재하였다. 따라서 본 논문에서는 화염의 공간적인 분포를 고려하기 위한 하나의 방법인 국부화염전달함수를 소개하고 이를 적용하여 열음향 해석 문제에서 열분포가 불안정 예측 결과에 미치는 영향을 비교, 평가하였다. 전역 화염전달함수를 이용한 모델보다 국부 화염전달함수를 적용한 모델이 성장률 예측에 있어서 오차가 줄어드는 것으로 나타났다. Most thermoacoustic(TA) models assume that the rate of heat release occurs at infinitely thin flames. This over-simplification of the reaction zone in the model is found to affect the prediction accuracy. The current paper introduces a local flame transfer function(FTF) as one of the methods considering heat release distribution. From the TA modeling results, the prediction accuracy when using the local FTF can be improved in comparison with the models using the global FTF.
희박 예혼합 가스터빈 연소기에서의 유동 및 연소 특성 모델링
임재영(Jaeyoung Lim),김진아(Jinah Kim),어재경(Jaekyoung Uh),김지환(Jihwan Kim),김대식(Daesik Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Demand of the low fuel consumption gas turbines has recently increased in the aviation industry as well as in the power generation industry. Especially, application of lean premixed combustor in the combined cycle power plant has been generalized due to its superior fuel efficiency and emission characteristics to the diffusion type combustors. However, because the lean premixed combustor is operated under very lean low equivalence ratio, the combustion stability can be easily affected by the flow perturbations such as equivalence ratio and inlet velocity fluctuations. Therefore there have been a lot of efforts for controlling and understanding the combustion instabilities measured under the lean fuel-air mixture. As one of these efforts, this paper focused on the effects of the flame shape on the flame dynamics using CFD techniques. Results show that the modeled flame geometry is very close to the measured one after considering heat transfer from flames to the combustor wall.
McCune-Albright syndrome 환자의 치과적 특성
임재영(Jae-Young Lim),송제선(Je-Seon Song),이고은(KoEun Lee),이제호(Jae-Ho Lee) Asia association of Disability and Oral health 2018 International Journal of Disability and Oral Healt Vol.14 No.1
McCune-Albright syndrome (MAS) is a rare disease characterized by fibrous dysplasia (FD), Cafe-au-lait spots, and endocrine disorder. A 4-year-old girl with MAS visited the clinic with a chief complaint of facial asymmetry and bruxism without any pain. Facial asymmetry and many dental problems such as midline deviation, “ground glass appearance” on the entire jaw, thinned cortical bone, loss of lamina dura and ectopic germs were found. Because of severely displaced tooth germs and FD affected jaw, there is a high possibility of malocclusion during mixed/permanent dentition. It is necessary to observe the eruption pattern periodically. If there are clinical symptoms like an abnormal eruption pattern, facial asymmetry or high caries susceptibility, appropriate interventions of dentist are required.
국제경제 ; 한국정부의 공공보건정책 투자사업이 경제성장에 미치는 영향
임재영 ( Jae Young Lim ) 국제지역학회 2009 국제지역연구 Vol.13 No.3
공공보건정책사업에 대한 투자는 국민들의 건강수준을 향상시켜 미래의 의료비 절감효과가 나타날 것이며 질병부담 감소로 인한 생산성 손실이 감소할 것이며, 이러한 공공보건정책사업에 의한 건강증진효과는 경제성장을 촉발시키는 원동력이 될 것으로 사료된다. 본 논문에서는 공공보건정책사업의 투자효과를, 사업시행의 결과로 국민들의 질병으로 인한 사회경제적 비용이 감소했는지의 여부와 그 정도로 측정했으며, 특히 구축된 시계열 자료를 토대로 미시적 분석을 수행하기 위해, 질병으로 인한 사회경제적 비용규모가 가장 큰 5대 질환군 및 각 연령대별 인구집단을 대상으로 시행된 공공보건정책사업의 건강증진효과와 이들 효과가 경제성장에 미친 영향을 분석하였다. 분석결과를 요약하면, 질환별로는 호흡기계, 소화기계, 순환기계 및 감염성 질환 등에서 정책효과가 유의했고, 연령대별로는 0~9세, 10~19세, 40~49세, 50~59세, 60~69세 및 70세 이상 연령대에서 유의한 효과를 보였다. 아울러 이들 질병으로 인한 사회경제적 비용의 절감은 실질국내총생산의 증가에 통계적으로 유의하게 영향을 미쳤음을 알 수 있었다. Investment in health through an array of public health policies will lead to improvement of health at all levels, and the improved health can reduce the socioeconomic costs incurred with diseases. And finally, with reduced healthcare costs associated with diseases and health problems, economy will be able to achieve economic growth and development. Using simultaneous equations model, this study aims to identify this possible channel from public health policies to economic growth. Specifically, the policy effect is investigated on a basis of main disease groups and aging groups. The public health policies are proved to reduce healthcare costs related with disease groups including respiratory, digestive, circulative, and infectious disease, and with all age groups except 20~39 group. And the reduced healthcare costs have shown to increase the real gross domestic products in those group above.
Trichophyton tonsurans Kerion 2 예
임재영(Jae Young Lim),장호선(Ho Sun Jang),오창근(Chang Keun Oh),권경술(Kyung Sool Kwon),김문범(Moon Bum Kim) 대한피부과학회 2002 대한피부과학회지 Vol.40 No.3
We report two cases of kerion celsi caused by Trichophyton tonsurans, One is a 16-year-old male Judo-player in athletic high school and the other is a 7-year-old boy. Kerion celsi is a highly inflammatory, suppurative fungal infection of the scalp caused mainly by zoophilic dermatophytes transmitted from animals to man. The first case presented with a 4cm sized, markedly inflammatory, boggy mass on the occipital scalp. The second one showed several 2-3cm sized, erythematous, follicular pustules and plaques with partial hair loss on the frontal and parietal scalp. The diagnosis was established by histopathologic and mycologic studies that are KOH, fungus culture, slide culture and histopthologic exams of the lesional specimen. All the lesions of the patients were cleared with itraconazole for several weeks and short-term systemic steroid. (Korean J Dermatol 2002; 40(3): 286-290)
한국 지방정부의 야시장제(Night Mayor) 도입 가능성 검토
임재영(Lim, Jae Young) 한국지역개발학회 2019 韓國地域開發學會誌 Vol.31 No.3
In recent years, several well-known cities around the world have begun to adopt an institution called ‘night mayor.’ Night mayor is mainly responsible for managing city affairs happening at night and bridging the gap between entertainment businesses and city officials. Cities are increasingly paying attention to the ‘24 Hour City Concept’ as part of their efforts to strengthen their competitiveness and attractiveness. As a result, they have turned their eyes toward night-time culture and night economy. Still, there are not many cities that have adopted night mayor. But it can help use city infrastructure that is already there. Moreover, it can also enrich city life and economy. As such, the institution can offer substantial benefits to those thinking about adopting it including cities in Korea. This article examines cities that have adopted or are considering to adopt night mayor and suggests potential policy preparations needed to make its adoption successful in Korea.