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윤여성,강구,박성직,홍성구,Yoon, Yeo Seong,Kang, ku,Park, Seong Jik,Hong, Seong Gu 한국농공학회 2017 한국농공학회논문집 Vol.59 No.5
In South Korea, 25 % of annual agricultural residues (11.64 million tons) are unused. The hydrophilicity, low lower heating value (LHV), and low energy density of agricultural residues can be obstacles for efficient usage. Torrefaction, a low temperature pyrolysis process, can be a solution to overcome these disadvantage of agricultural residues. In this study, agricultural residues such as bean stem, pepper stem, perilla stem, sorghum stem, acorn shell, and ginkgo shell are torrefied at 200, 230, and $250^{\circ}C$ and evaluated energy properties, respectively. The torrefaction can increase the LHV and energy density rate of agricultural residues from 3,331~4,444 kcal/kg to 4,166~5,830 kcal/kg and 20~30 %, respectively.
초미립 clay를 이용한 자동차부품용 TPE 소재의 난연특성에 관한 연구
윤여성(Yeo-Seong Yoon),오미혜(Mee-Hye OH),강민경(Min-Kyung Kang),이춘범(Chun-Beom Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, the properties of TPE (Thermo Plastic Elastomer) nanocomposite with clay have been compared with clay content in terms of thermal, flame retardant and mechanical properties. 2M2HT (d??₁= 31.5 A) and MT2EtOH (d??₁= 18.5Å) were used additive. We compared the properties according to the content of the clay in PP/EPDM matrix. FT-IR, XRD showed that the 2M2HT was dispersed homogeneously into the PP/EPDM matrix as nano-scale. In general thermal and mechanical properties of nanocomposite are not influenced by added clay. However. in case of the property of flame retardants had showed superior as d-spacing value in clay is higher.
바이오매스 합성가스를 이용한 혼소식 디젤엔진 발전기의 적용성 평가
윤여성 ( Yoon Yeo Seong ),서도현 ( Seo Do Hyun ),강구 ( Kang Ku ),최선화 ( Choi Sun Hwa ),홍성구 ( Hong Seong Gu ) 한국농공학회 2017 한국농공학회논문집 Vol.59 No.1
Biomass gasification produces syngas or producer gas as low calorific fuel gas that can be used as a fuel for combustion or prime movers as well as chemical synthesis. Internal combustion engines are readily available with lower costs and easily used for producing distributed power using biomass syngas. In this study, a dual fuel diesel engine was used to evaluate its performance when biomass syngas is used for fuel. The engine was originally developed for biogas application with a diesel engine with a 2,607 cc displacement. Both diesel fuel and syngas consumptions were observed at the different load conditions. The results indicate that the dual fuel engine showed a reasonably good performance and up to 63 % of diesel fuel saving.
오승현,윤여성,진희경,성제경,Oh, Seung-hyun,Yoon, Yeo-sung,Jin, Hee-Kyung,Seong, Je-kyung 대한수의학회 2004 大韓獸醫學會誌 Vol.44 No.2
We investigated the cytogenetic characteristics of male black-striped field mouse (Apodemus agrarium) in Korea. Chromosome slides were obtained from blood cell cultures which were synchronized with thymidine blocking or not. In the chromosome slide which synchronization with thymidine blocking was employed on, the GTG(G bands by trypsin using Giemsa)-bands of high resolution were observed. The male black-striped field mouse has 48 chromosomes composed 46 autosomes and XY sex chromosomes. The centromeric regions of autosomes were positive to GTG-banding. According to this investigation, thymidine blocking in cell culture process was useful to get lengthened chromosomes. It may be necessary to employ RBG-banding technique to investigate complementary band patterns between R- and G-banding in black-striped field mouse.
김보라,오승현,윤여성,성제경,Kim, Bora,Oh, Seung-hyun,Yoon, Yeo-sung,Seong, Je Kyung 대한수의학회 2001 大韓獸醫學會誌 Vol.41 No.3
This study was conducted to observe the bone and cartilage formation of mouse fetuses. Mouse litters were sacrificed at pregnant 14th and 18th day and examined for gross skeletal formation using cartilage and bone staining. We identified well developed cartilage formation at the 14th pregnant day in mouse fetus. However mouse fetus at the 14th pregnant day did not show any part of bone formation. At 18th pregnant day, mouse fetus showed well developed body shape and bone and cartilage formation. This results will provide basic information for the evaluation of mouse malfromation and impairment of skeleton formation. Further study will be needed for exact explanation of bone formation from cartilage portion.
몽고리안 저빌의 Harderian gland의 출생후 형태학적 변화
오승현,박지영,윤여성,김대중,남상윤,이준섭,성제경,Oh, Seung-hyun,Park, Ji-young,Yoon, Yeo-sung,Kim, Dae-joong,Nam, Sang-yoon,Lee, Joon-sup,Seong, Je-kyung 대한수의학회 1999 大韓獸醫學會誌 Vol.39 No.1
This investigation was carried out to study morphological and chronological aspects of the development of the Harderian gland in the Mongolian gerbil(Meriones unguiculatus). Male and female Mongolian gerbils were sacrificed on days 1, 3, 5, 10, 30 and 60 after birth and their Harderian glands were processed for light microscopic observation. The results obtained were summarized as follows; 1. In 1-day-old Mongolian gerbil, Harderian gland was well distinguished from other tissue structures. It was composed of several immature tubules, and these tubules were separated each other by undifferentiated mesenchymal connective tissues. 2. In 3-day and 5-day-old Mongolian gerbils, the arrangement of tubules in the gland was more condensed than that of 1-day-old Mongolian gerbil. The excretory ducts started to appear in the connective tissues located between lobes. 3. In 10-day-old Mongolian gerbil, small lipid vacuoles began to be found in the cytoplasm of the secretory cells of the Harderian gland. There were some mucus-secreting cells within the epithelium of the excretory duct found in the interlobar connective tissues. 4. In 30-day-old Mongolian gerbil, there was markedly increased number of the tubules in the glands. The epithelial cells of the tubules were typically columnar in shape. Most of the columnar epithelial cells contained many small lipid vacuoles, although a few cells contained large lipid vacuoles. 5. In 60-day-old Mongolian gerbil, the Harderian gland exhibited the typical structural characteristics of the adult gland. The mature glandular structures were more distinct than those of 30-day-old animals.