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Shin, Daekeun,Park, Sin-Hye,Choi, Yean-Jung,Kim, Yun-Ho,Antika, Lucia Dwi,Habibah, Nurina Umy,Kang, Min-Kyung,Kang, Young-Hee MDPI 2015 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.16 No.12
<P>Asthma is characterized by aberrant airways including epithelial thickening, goblet cell hyperplasia, and smooth muscle hypertrophy within the airway wall. The current study examined whether kaempferol inhibited mast cell degranulation and prostaglandin (PG) release leading to the development of aberrant airways, using an <I>in vitro</I> model of dinitrophenylated bovine serum albumin (DNP-BSA)-sensitized rat basophilic leukemia (RBL-2H3) mast cells and an <I>in vivo</I> model of BSA-challenged asthmatic mice. Nontoxic kaempferol at 10–20 μM suppressed β-hexosaminidase release and cyclooxygenase 2 (COX2)-mediated production of prostaglandin D2 (PGD2) and prostaglandin F2α (PGF2α) in sensitized mast cells. Oral administration of ≤20 mg/kg kaempferol blocked bovine serum albumin (BSA) inhalation-induced epithelial cell excrescence and smooth muscle hypertrophy by attenuating the induction of COX2 and the formation of PGD2 and PGF2α, together with reducing the anti-α-smooth muscle actin (α-SMA) expression in mouse airways. Kaempferol deterred the antigen-induced mast cell activation of cytosolic phospholipase A2 (cPLA2) responsive to protein kinase Cμ (PKCμ) and extracellular signal-regulated kinase (ERK). Furthermore, the antigen-challenged activation of Syk-phospholipase Cγ (PLCγ) pathway was dampened in kaempferol-supplemented mast cells. These results demonstrated that kaempferol inhibited airway wall thickening through disturbing Syk-PLCγ signaling and PKCμ-ERK-cPLA2-COX2 signaling in antigen-exposed mast cells. Thus, kaempferol may be a potent anti-allergic compound targeting allergic asthma typical of airway hyperplasia and hypertrophy.</P>
오메가-3와 -9 지방산의 혼합 급이가 계육내 오메가-3 계열 다가불포화지방산의 조성에 미치는 영향
신대근(Daekeun Shin),최성호(Seung Ho Choi),조영무(Young Moo Cho),박재홍(Jae Hong Park) 韓國家禽學會 2012 韓國家禽學會誌 Vol.39 No.1
To evaluate the effects of n-3 and n-9 fatty acid combination on broiler chicks, diets containing the combinations of five different fat sources including flaxseed oil, fish oil, EPA, DHA and olive oil were provided, and all chicks were processed at 4 weeks of growth. Liver, breast and thigh samples were collected and fatty acid composition and/or CIE L*, a* and b* measurement were measured. Also, live chick and liver weights were weighed and the ratio was provided as an evidence of fat accumulation in liver. No significant difference was determined in both live and liver weight ratio and liver color. EPA was low in FHO as compared to livers from others. In contrast, DHA was significantly high in FHO. In broiler breasts derived from FDO, AA and n-3 fatty acid content was high, but only numerical differences of EPA and DHA were determined in breasts from FDO. The thighs from FHO showed high in EPA, DHA and n-3 fatty acid content but had low in AA and n-6 to n-3 ratio. Therefore, the results indicate that broiler chicken diets containing either FDO or FHO may be possible combination diets increasing n-3 polyunsaturated fatty acids in broiler chicks.
교전 운용에 따른 충격하중을 고려한 안테나 장치의 구조건전성 및 성능 분석
김대근(Daekeun Kim),임선빈(Seonbin Lim),노현규(Hyun Gyu Roh),이종학(Jong-Hak Lee),신동준(Dong-Jun Shin),이종훈(Jong-Hoon Lee),박경락(Gyeong-Rak Park),강신민(Shin-Min Kang),박노철(No-Cheol Park) 한국소음진동공학회 2023 한국소음진동공학회 논문집 Vol.33 No.6
The antenna device used in the close-in weapon systems is the primary device for detecting targets and effectively countering enemy aircraft, anti-ship guided munitions, and close-in maritime terrorist threats, as well as ensuring survivability in a warfare environment. The antenna device must exhibit structural integrity and meet the radar performance criteria for warfare operations scenarios that consider the shock loads from underwater weapons and machine gun fire, as well as general environmental conditions. To simulate the warfare operating environment for underwater explosion and machine gun shock loads, the German Navy’s BV043 standard and actual machine gun data were used to convert the antenna mount response into a time-history signal. This simulation formed the basis for the development of a finite element analysis model of an antenna device for a ship equipped with machine guns, and modal analysis and transient response analysis were performed. For shock resistance analysis, stress-based evaluation of the structure and acceleration-based evaluation of the components were performed based on the results of the finite element analysis to evaluate the structural integrity and performance of the radar.
다양한 조건의 조명변화에 적응적인 지역적 스테레오 매칭 기법
김대근(Daekeun Kim),신광무(Kwangmu Shin),정기동(Kidong Chung) 한국정보과학회 2011 정보과학회논문지 : 소프트웨어 및 응용 Vol.38 No.12
최근 3D영화의 흥행과 더불어 3D 영상제작 기술들이 높은 관심을 받고 있다. 변이 정보를 획득하기 위한, 스테레오 매칭에 관한 분야는 꾸준히 연구가 되고 있는 분야이다. 그 중에서도 지역적 방법은 구현의 용이성과 낮은 계산복잡도로 인하여 많은 연구가 진행되고 있다. 하지만 대부분의 지역적 방법들은 영상이 외부환경에 변형되었을 때의 경우를 고려하지 않고 있기 때문에, 외부환경에 의해 많이 변형된 영상에 대해서는 제대로 된 변이 정보를 추출해내지 못한다. 본 논문에서는 양쪽 영상에서 픽셀간의 차이를 이용하여 서로 대응되는 영역을 찾는 스테레오 매칭 기법을 제안한다. 제안하는 기법은 조명과 같은 외부요소에 강인한 특징을 가진다. 이 기법은 전 처리나 후처리 과정에서 부가적인 작업의 수행 없이 기법 자체만으로 외부요소에 대한 보상을 실행한다는 면에서 장점을 가진다. 다양한 영상에서 변이를 추출하는 실험 결과, 단계적 조명 변화에 대해서도 대조군 방법과 비교하여 균일한 변이 영상을 획득할 수 있었다. 3d video production technology get many people´s attention because 3d movie is a box office hit. For obtaining disparity information, stereo matching was studied steadily. Among them, local method is achieved many research results because of its low complexity and speed. But, many local method don´t consider about illumination variations and disparity image is wrong about the image changed by various illuminations. So this paper proposes stereo matching method robust to various illumination changes using difference value of the pixel values of the difference in the window. It doesn´t need pretreatment and posttreatment. This method gets a good result about the image changed by illumination by experiment.
Gong, Ju-Hyun,Shin, Daekeun,Han, Seon-Young,Park, Sin-Hye,Kang, Min-Kyung,Kim, Jung-Lye,Kang, Young-Hee Hindawi Publishing Corporation 2013 Evidence-based Complementary and Alternative Medic Vol.2013 No.-
<P>Asthma is characterized by bronchial inflammation causing increased airway hyperresponsiveness and eosinophilia. The interaction between airway epithelium and inflammatory mediators plays a key role in the asthmatic pathogenesis. The <I>in vitro</I> study elucidated inhibitory effects of kaempferol, a flavonoid found in apples and many berries, on inflammation in human airway epithelial BEAS-2B cells. Nontoxic kaempferol at ≤20 <I><I>μ</I></I>M suppressed the LPS-induced IL-8 production through the TLR4 activation, inhibiting eotaxin-1 induction. The <I>in vivo</I> study explored the demoting effects of kaempferol on asthmatic inflammation in BALB/c mice sensitized with ovalbumin (OVA). Mouse macrophage inflammatory protein-2 production and CXCR2 expression were upregulated in OVA-challenged mice, which was attenuated by oral administration of ≥10 mg/kg kaempferol. Kaempferol allayed the airway tissue levels of eotaxin-1 and eotaxin receptor CCR3 enhanced by OVA challenge. This study further explored the blockade of Tyk-STAT signaling by kaempferol in both LPS-stimulated BEAS-2B cells and OVA-challenged mice. LPS activated Tyk2 responsible for eotaxin-1 induction, while kaempferol dose-dependently inhibited LPS- or IL-8-inflamed Tyk2 activation. Similar inhibition of Tyk2 activation by kaempferol was observed in OVA-induced mice. Additionally, LPS stimulated the activation of STAT1/3 signaling concomitant with downregulated expression of Tyk-inhibiting SOCS3. In contrast, kaempferol encumbered STAT1/3 signaling with restoration of SOCS3 expression. Consistently, oral administration of kaempferol blocked STAT3 transactivation elevated by OVA challenge. These results demonstrate that kaempferol alleviated airway inflammation through modulating Tyk2-STAT1/3 signaling responsive to IL-8 in endotoxin-exposed airway epithelium and in asthmatic mice. Therefore, kaempferol may be a therapeutic agent targeting asthmatic diseases.</P>