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석병석(Suk, Byong-suk),민승용(Min, Seung-yong),권재욱(Kwon, Jae-wook),김창균(Kim, Chang-kyoon),문상만(Moon, Sang-man),최수진(Choi, Su-jin),구철회(Koo, Cheol-hea),김인규(Kim, In-kyu),류동영(Ryu, Dong-young) 한국항공우주연구원 2015 항공우주산업기술동향 Vol.13 No.2
시험용 달 궤도선의 발사 요구조건 사전 분석 단계로 최근 외국에서 발사한 달 탐사선의 발사 요구조건을 분석하였다. 일반적으로 달 탐사선의 발사 요구조건은 달 임무 궤도를 결정하는 중요한 요소이며, 또한 지구, 달, 태양의 상대적인 운동으로 인해 임무궤도 요구조건을 만족하는 발사 가능 시간이 주기적으로 반복되는 경향이 있다. 분석 결과 설정된 발사 요구조건들로부터 달 궤도선의 주 임무가 달의 남/북극 지역의 광학 관측 임을 간접적으로 알 수 있었다. 향후 우리나라 달 궤도선 발사 요구 조건 설정에 본 논문이 도움이 되길 기대한다. In the preliminary study on launch window requirement for Korea Path-finder Lunar Orbiter(KPLO), the recent foreign lunar orbiter’s lauch window requirement was analyzed. Normally, the launch requirements depends on the mission orbit. Based on the relationship between Moon, Earth, and Sun, the launch time will be available periodically to meet requirements. In this paper, it is understood that the launch window requirements come from payload mission requirements to take picture each poles of Moon. This paper might be a practical example to derive KPLO launch requirements in the future.
Analysis of Stem Wave due to Long Breakwaters at the Entrance Channel
Kwon, Seong-Min,Moon, Seung-Hyo,Lee, Sang-Heon,Yoo, Jae-Woong,Lee, Joong-Woo Korean Institute of Navigation and Port Research 2017 한국항해항만학회지 Vol.41 No.5
Recently, a new port reserves deep water depth for safe navigation and mooring, following the trend of larger ship building. Larger port facilities include long and huge breakwaters, and mainly adopt vertical type considering low construction cost. A vertical breakwater creates stem waves combining inclined incident waves and reflected waves, and this causes maneuvering difficulty to the passing vessels, and erosion of shoreline with additional damages to berthing facilities. Thus, in this study, the researchers have investigated the response of stem waves at the vertical breakwater near the entrance channel and applied numerical models, which are commonly used for the analysis of wave response at the harbor design. The basic equation composing models here adopted both the linear parabolic approximation adding the nonlinear dispersion relationship and nonlinear parabolic approximation adding a linear dispersion relationship. To analyze the applicability of both models, the research compared the numerical results with the existing hydraulic model results. The gap of serial breakwaters and aligned angles caused more complicated stem wave generation and secondary stem wave was found through the breakwater gap. Those analyzed results should be applied to ship handling simulation studies at the approaching channels, along with the mooring test.
Relationship of hepatic venous pressure gradient and prognosis in patients with Liver cirrhosis
Moon Young Kim,Soon Koo Baik,Yoon Ok Jang,Ki Tae Suk,Chang Jin Yea,Il Young Lee,Hye Jung Kim,Hearn Kook Kim,Kyoung Won Park,Jae Woo Kim,Hyun Soo Kim,Sang Ok Kwon,Soon Ho Um,Kwang Hyub Han 대한간학회 2008 Clinical and Molecular Hepatology(대한간학회지) Vol.14 No.3(S)
Kwon, Da Hye,Cha, Hee-Jae,Choi, Eun Ok,Leem, Sun-Hee,Kim, Gi-Young,Moon, Sung-Kwon,Chang, Young-Chae,Yun, Seok-Joong,Hwang, Hye Jin,Kim, Byung Woo,Kim, Wun-Jae,Choi, Yung Hyun UNKNOWN 2018 INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE Vol.41 No.1
<P>Schisandrin A is a bioactive lignan occurring in the fruits of plants of the <I>Schisandra</I> genus that have traditionally been used in Korea for treating various inflammatory diseases. Although the anti-inflammatory and antioxidant effects of lignan analogues similar to schisandrin A have been reported, the underlying molecular mechanisms have remained elusive. In the present study, schisandrin A significantly suppressed the lipopolysaccharide (LPS)-induced production of the key pro-inflammatory mediators nitric oxide (NO) and prostaglandin E<SUB>2</SUB> by suppressing the expression of inducible NO synthase and cyclooxygenase-2 at the mRNA and protein levels in RAW 264.7 macrophages. Furthermore, schisandrin A was demonstrated to reduce the LPS-induced secretion of pro-inflammatory cytokines, including tumor necrosis factor-α and interleukin-1β; this was accompanied by a simultaneous decrease in the respective mRNA and protein levels in the macrophages. In addition, the LPS- induced translocation of nuclear factor-κB (NF-κB), as well as activation of mitogen-activated protein kinases (MAPKs) and phosphatidylinositol-3 kinase (PI3K)/Akt pathways were inhibited by schisandrin A. Furthermore, schisandrin A significantly diminished the LPS-stimulated accumulation of intracellular reactive oxygen species, and effectively enhanced the expression of NF erythroid 2-related factor 2 (Nrf2) and heme oxygenase-1 (HO-1). These results suggested that schisandrin A has a protective effect against LPS-induced inflammatory and oxidative responses in RAW 264.7 cells by inhibiting the NF-κB, MAPK and PI3K/Akt pathways; these effects are mediated, at least in part, by the activation of the Nrf2/HO-1 pathway. Based on these results, it is concluded that schisandrin A may have therapeutic potential for treating inflammatory and oxidative disorders caused by over-activation of macrophages.</P>
[P089] A case of classic Kaposi`s sarcoma showing spontaneous remission
( Sung Hye Eun ),( Hyuck Sun Kwon ),( Ji Hae Lee ),( Jung Min Bae ),( Gyong Moon Kim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Kaposi`s sarcoma (KS) is a locally aggressive endothelial tumor belonging to the family of vascular sarcoma. Four variants have been described: classic KS, endemic African KS, KS associated with immunosuppressive therapy, and AIDS-related KS. Up to recently, there are some controversies whether KS is a reactive proliferative disorder or a true malignant neoplasm and spontaneous remission of KS has been rarely reported. In previous literatures, spontaneous remission of KS has been reported in immune compromised patients. However, spontaneous remission of classic KS is uncommon. Herein, we report a case of classic KS which showed spontaneous remission, suggesting that KS may be a reactive disorder. A 77-year-old man presented with multiple purpuric nodules on the trunk and extremities for 3 months. No mucosal involvement was noted. Except for the history of angina pectoris and hypertension, he had no remarkable history such as immunosuppression. Laboratory findings including anti-HIV antibody were also unremarkable. Histopathological examination revealed slit like vascular spaces infiltrating the entire dermis and the vascular spaces were lined by spindle endothelial cells. With positive results of HHV-8 stain, the diagnosis of classic KS was made. However, at the 3-month follow-up while in the process of staging work-up, all skin lesions were spontaneously regressed without any specific treatment.
Moon, Yeon-Hee,Kwon, Seong-Min,Kim, Hyo-Jun,Jung, Kwan-Young,Park, Jong-Hwan,Kim, Soo-A,Kim, Yong-Chul,Ahn, Sang-Gun,Yoon, Jung-Hoon Spandidos Publications 2009 ONCOLOGY REPORTS Vol.22 No.5
<P>Photodynamic therapy (PDT) is currently being used as an alternative therapeutic modality for a variety of malignant tumors. This study was performed to show an efficient preparation of second generation of photosensitizer chlorin e6 (Ce6) with high yield and purity, and to test antitumor activity of Ce6-induced PDT (Ce6-PDT) both in vitro and in vivo using a rat tumor model. Three-week-old male Sprague-Dawley (SD) rats were inoculated s.c. on the right flank with 5x10(6) RK3E-ras cells. The animals were administered i.v. with Ce6 (10 mg/kg) and 24 h later, PDT was performed using a laser diode at a light dose of 100 J/cm2. Ce6-PDT generated reactive oxygen species and led to significant growth inhibition in RK3E-ras cell. In addition, Ce6-PDT induced apoptosis through the activation of caspase-3 and its downstream target, PARP cleavage. The protein level of anti-apoptotic bcl-2 was also reduced by Ce6-PDT in RK3E-ras cells. In in vivo experiments, application of Ce6-PDT led to a significant reduction of tumor size. PCNA immunostaining and TUNEL assay revealed that Ce6-PDT inhibited tumor cell proliferation and increased apoptosis. These findings suggest that the newly purified Ce6-PDT can effectively arrest tumor growth by inhibiting cell proliferation and inducing apoptosis.</P>