Astronomical Characteristics of Cheonsang-yeolcha-bunyajido from the Perspective of Manufacturing Methods

안상현 한국우주과학회 2015 Journal of Astronomy and Space Sciences Vol.32 No.1

I investigated a method for drawing the star chart in the planisphere Cheonsang-yeolcha-bunyajido. The outline of the starchart can be constructed by considering the astronomical information given in the planisphere alone and the drawingmethod described in Xin-Tangshu; further the chart can be completed by using additional information on the shape andlinking method of asterisms out of an inherited star chart. The circles of perpetual visibility, the equator, and the circle ofperpetual invisibility are concentric, and their common center locates the Tianshu-xing, which was defined to be a pole starin the Han dynasty. The radius of the circle of perpetual visibility was modified in accordance with the latitude of Seoul,whereas the other circles were drawn for the latitude of 35°, which had been the reference latitude in ancient Chineseastronomy. The ecliptic was drawn as an exact circle by parallel transference of the equator circle to fix the location of theequinoxes at the positions recorded in the epitaph of the planisphere. The positions of equinoxes originated from the Handynasty. The 365 ticks around the boundary of the circle of perpetual invisibility were possibly drawn by segmenting thecircumference with an arc length instead of a chord length with the ratio of the circumference of a circle to its diameter asaccurate as 3.14 presumed. The 12 equatorial sectors were drawn on the boundary of the star-chart in accordance with thebeginning and ending lodge angles given in the epitaph that originated from the Han dynasty. The determinative lines forthe 28 lunar lodges were drawn to intersect their determinative stars, but seven determinative stars are deviated. Accordingto the treatises of the Tang dynasty, these anomalies were inherited from charts of the period earlier than the Tang dynasty. Thus, the star chart in Cheonsang-yeolcha-bunyajido preserves the old tradition that had existed before the present Chinesetradition reformed in approximately 700 CE. In conclusion, the star chart in Cheonsang-yeolcha-bunyajido shows the sky ofthe former Han dynasty with the equator modified to the latitude of Seoul.

수학교육 연구와 현상학적 서술

안상현,조정수 한국수학교육학회 2012 수학교육 학술지 Vol.2012 No.1

본 연구는 수학교육 연구에서 기존의 실증주의적 전통의 양적연구에 대한 대안적, 혹은 보완적 방법으로서 현상학적기술의 가능성을 살펴보고자 한다. 이를 위하여 의식의 지향성, 생활세계, 판단중지, 현상학적 환원을 중심으로 이론적 고찰을 실시하였다. 이러한 이론적 고찰을 토대로 수학교실 장면을 드러내는 현상학적 기술을 시도하고 이를 소개 하고자 한다.

국내 분과 발표 : 2009 개정 수학과 교육과정에 따른 중학교 교과서의 공학 사용에 대한 분석

안상현,조정수 한국수학교육학회 2013 수학교육 학술지 Vol.2013 No.2

황련-감초 추출물의 지방축적 감소를 통한 비알콜성지방간 개선 효과

안상현,김기봉 대한한방소아과학회 2019 대한한방소아과학회지 Vol.33 No.2

Objectives: Coptidis Rhizoma and Glycyrrhiza Uralensis are herbs that treat obesity and dampness-phlegm. The aim of this study is to investigate the efficacy of Coptidis Rhizoma and Glycyrrhiza Uralensis on lipid deposition with nonalcoholic fatty liver disease (NAFLD). Methods: Male 6-week-old C57BL/6 male mice were divided into three groups: control group (Ctrl), high fat diet group (HFF), and high fat diet with Coptidis Rhizoma and Glycyrrhiza Uralensis extract administration group (CGT). Each 10 mice were allocated to each group (total of 30 mice). All mice were allowed to eat fat rich diet freely throughout the experiment. To examine the effect of Coptidis Rhizoma and Glycyrrhiza Uralensis, we observed weight changes, total cholesterol and glucose levels, lipid blot distributions, PGC-1, p-IkB, and p-JNK. Results: Body weights for all mice were measured and analyzed the difference between the groups. Weight gain was significantly lower in CGT group than the HFF group. Total cholesterol and glucose levels were significantly lower in CGT group. The distribution of lipid blots and positive reaction of PGC-1 were significantly lower in CGT group. The positive reaction of p-IκB in hepatic tissues was significantly lower in CGT group. The positive reaction of p-JNK in hepatic tissues was significantly lower in CGT group. Conclusions: Coptidis Rhizoma and Glycyrrhiza Uralensis have the effect of improving non - alcoholic fatty liver induced insulin resistance through regulation of lipid metabolism.

GMAW 용접 공정에서 중력 방향에 의한 용융풀의 흐름 패턴 및 용적 이행에 관한 연구

안상현,배준성,정광호,조대원,박창우,박중구,최두진 대한용접·접합학회 2023 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2023 No.10

IPv6기반 MANET 환경에서의 주소 할당 및 인터넷 연결성 지원

안상현,이영주,김영민,An Sang-Hyeon,Lee Yeong-Ju,Kim Yeong-Min 대한전자공학회 2006 전자공학회지 Vol.33 No.8

외부전극 형광램프의 발광 및 플라즈마 특성

안상현,이민규,정종문,김정현,유동근,구제환,강준길,홍병희,최은하,조광섭,Ahn, S.,Lee, M.,Jeong, J.,Kim, J.,Yoo, D.,Koo, J.,Kang, J.,Hong, B.,Choi, E.,Cho, G. 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.3

A new diagnostics of plasma electron temperature and plasma density is introduced with the observation of the light emission along the tube of external electrode fluorescent lamps. With two different methods operating an external electrode fluorescent lamp of outer diameter 4.0 mm and length 860 mm for the back-light source of 37-inch LCD-TVs, the lighting modes and the plasma properties are investigated. In the center balance operation, the light-emission propagates simultaneously from both sides of the high voltage electrodes to the center of the lamp, while in conventional operation the light-emission propagates from the one end of a high voltage to the other ground electrode. In the operation value of luminance $10,000{\sim}15,000cd/m^2$, the electron plasma thermal energy $(kT_e)$ is about $1.3{\sim}2.7eV$ with the electron density $(n_e)$ is about $(1.6{\sim}3.6){\times}10^{16}m^{-3}$. 외부전극 형광램프(EEFL)에서 빛의 방출 전파 신호의 관측법에 의하여 플라즈마의 전자 온도와 밀도를 진단하는 새로운 방법을 소개한다. 직경 4.0 mm이고 램프 길이 860 mm인 37인치 LCD-TV용 외부전극 형광램프에 대하여, 전압 인가 방식에 따른 두 가지의 구동법에 의한 발광 형태와 플라즈마의 특성을 조사한다. 램프 양단에 고전압을 인가하는 구동 방식에서, 빛은 고전압이 인가된 램프 양 끝에서 중앙으로 빛의 방출이 전파되며, 램프 길이 전체에 대하여 휘도가 균일하다. 램프 한쪽에 고전압을 인가하고 다른 한쪽은 접지한 구동에서, 빛의 방출은 고전압이 인가된 전극에서 접지된 전극 방향으로 전파되며, 고전압 쪽의 휘도가 높고 접지 쪽의 휘도가 낮아 램프 길이 방향으로 휘도가 불균일하다. 이러한 발광 전파 신호로부터 전자의 표류 속도를 계산하여, 전자의 온도와 밀도를 얻는다. 외부전극 형광램프의 사용 휘도의 영역인 $10,000{\sim}15,000cd/m^2$에 대하여, 전자 온도 $(kT_e)$는 $1.3{\sim}2.7eV$, 플라즈마의 밀도 $(n_e)$는 $(1.6{\sim}3.6){\times}10^{16}m^{-3}$를 얻었다.

다공성 3차원 Ti 지지체의 제조 및 알카리처리에 따른 생체활성 평가

안상현,김승언,김교한,윤희숙,현용택,An, Sang-Hyun,Kim, Seung-Eon,Kim, Kyo-Han,Yun, Hui-Suk,Hyun, Yong-Taek 한국재료학회 2009 한국재료학회지 Vol.19 No.7

Ti scaffolds with a three-dimensional porous structure were successfully fabricated using powder metallurgy and modified rapid prototyping (RP) process. The fabricated Ti scaffolds showed a highly porous structure with interconnected pores. The porosity and pore size of the scaffolds were in the range of 66$\sim$72% and $300\sim400\;\mu$m, respectively. The sintering of the fabricated scaffolds under the vacuum caused the Ti particles to bond to each other. The strength of the scaffolds depended on the layering patterns. The compressive strength of the scaffolds ranged from 15 MPa to 52 MPa according to the scaffolds' architecture. The alkali treatment of the fabricated scaffolds in an aqueous NaOH solution was shown to be effective in improving the bioactivity. The surface of the alkali-treated Ti scaffolds had a nano-sized fibre-like structure. The modified surface showed a good apatite forming ability. The apatite was formed on the surface of the alkali treated Ti scaffolds within 1 day. The thickness of the apatite increased when the soaking time in a simulated body fluid (SBF) solution increased. It is expected that the surface modification of Ti scaffolds by alkali treatment could be effective in forming apatites in vivo and can subsequently enhance bone formation.

세포 스페로이드 디스펜서 설계

안상현,이덕규,박수아,김상헌,이주영,김완두,류원형,이준희 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.04

두시 하태독법의 IL-4 활성 조절이 D. farinae 유도 아토피유사피부염 발병 조절에 미치는 효과

안상현,김재규,천진홍,김기봉,Ahn, Sang Hyun,Kim, Jae Kyu,Cheon, Jin Hong,Kim, Ki Bong 대한한방소아과학회 2017 대한한방소아과학회지 Vol.31 No.1

Objectives Hataedock method is a Korean medical therapy which removes fetal toxin by orally administering herbal decoction to neonates. This study was to observe skin damage and anti-inflammatory effect via regulating IL-4 activity in NC/Nga mice which were induced atopic dermatitis (AD)-like skin lesion by Dermatophagoides (D.) farinae after applying Douchi Hataedock method. Methods NC/Nga mice with 3 weeks of gestational age were used. Each 10 mice were allocated to the control group (Ctrl), the AD-induced group (AE), and the group which induced AD after administering Douchi extract (GT). After 4 weeks from administering Douchi extract to the mice, the primary AD was induced by applying D. farinae extract 6 times per week for 3 weeks and then the secondary AD was induced by the same method after 1 week from the primary AD induction. To identify the skin damage and anti-inflammatory effect, we observed LxR, IL-4, Fc ${\varepsilon}$ receptor, substance P, and $NF-{\kappa}B$. Results The GT group showed alleviation of skin injury and decrease in capillary angiogenesis. Stratum corneum damage, epithelial cell hyperplasia, lymphocyte infiltration, and capillary distribution relatively decreased in the GT group. LxR-positive reaction in the GT group were increased by 53% than that of the AE group. IL-4 production, $Fc{\varepsilon}$ receptor activity, and substance P-positive reaction in the GT group were decreased by 82%, 42%, and 82% respectively compare to those of the AE group. $NF-{\kappa}B$-positive reaction in the GT group were decreased by 15% compare to that of the AE group. Conclusions Hataedock method with Douchi extract alleviated AD via reducing inflammatory cytokines secreted at the early stage of AD. Thus, Douchi Hataedock method has a beneficial effect for the prevention and treatment of AD.