포스터 발표 - 무기재료분과 / 전기화학분과 / 촉매분과 : 인산형 연료전지의 가스확산전극의 구조개선과 전기화학적 특성평가

안상현,심재철,유덕영,김인,이주성 ( Sang Hyun Ahn,Jae Cheol Shim,Duck Young Yoo,In Kim,Ju Seong Lee ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3

천년 전의 별똥비

안상현,배현진,조혜전,정성욱,AHN SANG-HYEON,BAE HYUN JIN,CHO HYE JEON,JUNG SUNG-WOOK 한국천문학회 2002 天文學論叢 Vol.17 No.1

별똥에는 분산 별똥(sporadic meteors)과 별똥비(meteor shower)에 속하는 별똥이 있다. 우리는 $\ulcorner$고려사$\lrcorner$ $\ulcorner$천문지$\lrcorner$에 적혀 있는 별똥 기록을 조사하여 10세기에서 14세기까지 지구 공전 궤도 상의 별찌(meteoroids)의 분포에 대해서 연구하였다 먼저 $\ulcorner$고려사$\lrcorner$ 에 나오는 별똥 기록의 간지날짜를 점검하여 교정하고 간추려서 자료를 만들었다. 별똥이 나타난 날짜를 조사하여 고려 시대의 별똥별의 특징을 살펴보았다. 고려 시대 별똥 기록은 각 시기에 유행한 철학 사조의 영향과 전쟁과 내란 등의 영향으로 기록 수가 변하는 것으로 추정하였다. 그러나 평소에 떨어지는 분산 별똥들의 계절적 개수 변화는 매우 자연스러웠다. 우리는 일년 중 특정한 날짜에 별똥별이 많이 떨어지는 시기가 몇 개 있음을 발견하였다. 우리는 이것을 별똥비로 보고, 한국$\cdot$일본$\cdot$중국$\cdot$아랍$\cdot$유럽의 역사 기록에 나오는 별똥 소나기 기록을 모두 조사한 다음, 이것을 $\ulcorner$고려사$\lrcorner$의 별똥 기록에서 구한 별똥비와 비교하였다. 우리는 뚜렷한 별똥비 셋과 약한 별똥비 서넛을 확인할 수 있었다. 뚜렷한 세 별똥비는 사자자리 별똥비, 페르세우스 별똥비, 핼리혜성이 남기는 두 별똥비 등의 요즘 별똥비와 각각 일치함을 알아냈다 또한 나머지 약한 별똥비들도 오늘날 관측되고 있는 약한 별똥비와 대체적으로 일치함을 보았다. 결론적으로 고려시대의 별똥비의 활동성은 오늘날의 그것과 크게 다르지 않았다. 이것은 오늘날 활발한 별똥비들의 수명의 하한을 주는 결과이다. 이러한 연구를 통해 별똥 관측에 있어서 우리나라 옛 사람들이 남긴 관측 기록은 실제 자연의 모습을 그대로 읽어낼 수 있을 정도로 꾸준하고 정밀하고 정직한 것이었음을 알 수 있었다. 또한 그러한 좋은 유산을 현대 천문학에 유용한 연구 자료로서 활용할 수 있었다. The spatial distribution of meteoroids or cometary debris along the orbit of the Earth is investigated by analyzing the meteoric records in the Chronicle of the Koryo dynasty (918-1392) which is called Koryosa. Sporadic meteors in this period show the seasonal variation in number, which is similar to the current meteors. We also found that there are a few spikes showing large accumulation of records around the same dates. We regard these spikes as meteor showers in the Koryo period. We compared the dates of meteor showers with those compiled from the historical records around the world including Korea, Japan, China, Arab, and European countries. We discovered three prominent showers and four weak showers. The prominent ones are the Leonids, the Perseids, and the Aquarids and the Orionids pair. The last pair is the remnants of Halley's comet. The astronomical records written in the history book of the Koryo dynasty are turned out to be accurate and written in a steady manner. We can also see that those records can be useful to contribute the development of modern astronomy and astrophysics.

황련감초 하태독법과 프로바이오틱스의 대장점막 내 면역조절 효과 비교연구

안상현,차호열,김기봉,Ahn, Sang Hyun,Cha, Ho Yeol,Kim, Ki Bong 대한한방소아과학회 2017 대한한방소아과학회지 Vol.31 No.2

Objectives Hataedock is a treatment that dispels toxic heat and meconium which has been accumulated to the fetus from a pregnant mother via orally administering herbal extracts to a newborn baby. This study was conducted to compare the efficacy of Hataedock, with using the extract of Coptis japonica & Glycyrrhiza uralensis, to the early administration of probiotics for immunomodulation in the intestinal mucosa. Methods NC/Nga mice were divided into three groups; Control group (no treatment), CGT group (3-week-old mice given the extract of Coptis japonica & Glycyrrhiza uralensis), and MBT group (3-week-old mice given a Bifidobacterium). After 2 weeks, the intestinal mucosa tissues of each group of mice were observed. Immunohistochemical staining for IL-4, IL-13, CD40, $Fc{\varepsilon}RI$, $p-I{\kappa}B$, EGF, and VEGF in the intestinal mucosa was performed. Results CGT group showed 65% decrease in IL-4, 67% decrease in IL-13, 58% decrease in CD40, 72% decrease in $Fc{\varepsilon}RI$, 76% decrease in $p-I{\kappa}B$, 41% increase in EGF and 100% increase in VEGF compared to the control group. MBT group also showed 50% decrease in IL-4, 63% decrease in IL-13, 33% decrease in CD40, 53% decrease in $Fc{\varepsilon}RI$, 46% decrease in $p-I{\kappa}B$, 23% increase in EGF and 151% increase in VEGF compared to the control group. Conclusions These results suggest that both Hataedock, with using the extract of Coptis japonica & Glycyrrhiza uralensis, and early administration of probiotics were effective in regulating Th2, relieving inflammation and developing intestinal mucosal tissues. Hataedock with extract of Coptis japonica & Glycyrrhiza uralensis may be more effective for immunomodulation in intestinal mucosa than probiotics.

건설사업관리(CM) 관리인력 규모산정을 위한 사례연구 - 공공공사 건축공사 사례를 중심으로 -

안상현,김진대,Ahn, Sang-Hyun,Kim, Jin-Dae 한국건설관리학회 2013 한국건설관리학회 논문집 Vol.14 No.4

국내 CM현장은 경기침체로 인해 성장이 다소 둔화되고 있지만 최근 공공기관 이전사업 등으로 인해 CM시장은 꾸준한 규모를 보이고 있다. CM제도가 도입된 이래로 다수의 발주기관들이 건설사업관리 역량을 점차 보유하고 있지만 이에 대한 건설사업관리 조직 규모 산정을 위한 노력은 미흡한 실정이다. 본 연구에서는 공공공사 건축공사 10개소 사례를 바탕으로 통계분석과 관리인력당 사업비를 활용하여 건설사업의 관리업무를 수행하는 전체 관리조직의 규모 산정 방법을 도출하였고 Case Study를 통해 활용성을 검토하고자 하였다. 이를 통해 적정 관리인력 규모 산정 및 투입으로 건설사업의 원활한 업무수행과 성공적으로 사업을 수행하는데 기여하고자 하였다. While growth of domestic CM market has slowed down due to economic recession, it recently shows sign of scale as some public agencies are relocating their headquarters. Since the introduction of CM system, a number of client organizations have acquired construction project management capabilities, however, sufficient efforts are not made to estimate the size of construction project management organization. This study drew a method for estimating the size of the organization managing construction project by utilizing statics analysis and project costs per member based on 10 public construction projects and tried to review applicability through case studies. With this study, we would like to make a contribution to achieving smoother work performance and success of the construction project by estimating and allocating proper scale of management workforce.

백호탕 추출물의 지방장벽 손상 개선을 통한 상피 내 Th2 분화 조절 효과

안상현,김기봉,정아람,Ahn, Sang Hyun,Kim, Ki Bong,Jeong, Aram 대한한방소아과학회 2021 대한한방소아과학회지 Vol.35 No.4

Objectives The purpose of this study is to confirm the regulate effect of T helper (Th) 2 differentiation that Baekho-tang extract may produce to improves skin lipid barrier damages. Methods Four-weeks-old NC/Nga mice were divided into four groups: control group (Ctrl, n=10), lipid barrier eliminated group (LBE, n=10), Dexamethasone treatment after lipid barrier elimination group (DxT, n=10), and Baekho-tang extract treatment group after lipid barrier elimination group (BHTT, n=10). Baeko-tang extract was administered for 3 days after removal of the skin fat barrier in BHTT group. Then, we identified changes in external symptoms of the skin, factors affecting skin barrier such as potential of hydrogen (pH), filaggrin (FLG), transepidermal water loss (TEWL) and Th2 differentiation factors like Interleukin (IL)-4, Kallikrein Related Peptidase 7 (KLK7) and protease activated receptor 2 (PAR-2) through our immunohistochemistry. Results After lipid barrier elimination, the reduction of morphological skin inflammations was less in BHTT group than in LBE group and DxT group. Also, pH and TEWL were significantly decreased with BHTT group. However, FLG was significantly increased in BHTT group compared to LBE, DxT, and Ctrl group. All kinds of Th2 differentiation factors (IL-4, KLK7 and PAR-2) were also decreased in BHTT compared to the LBE and DxT. Conclusions As a result of this study, BHT administration decreased pH, TEWL, and increased FLG, thus participating in recovering damaged skin barrier. Since Th2 differentiation factors were decreased as well, BHT's regulatory effect in sequential immune reactions may be a possible explanation of how it enhances recovery of the damaged lipid barrier.

공동주택 공사의 작업지연요소 분석

안상현,유정호,김창덕,Ahn, Sang-Hyun,Yu, Jung-Ho,Kim, Chang-Duk 한국건설관리학회 2007 건설관리 : 한국건설관리학회 학회지 Vol.8 No.6

작업지연은 건설사업의 확실성을 저해하는 요소이다. 따라서 작업지연 원인에 대한 분류체계를 확립하고 관리항목을 도출하는 것은 건설사업의 경쟁력을 향상시킬 수 있는 요인이다. 하지만 분류별 작업지 연원인의 정량적 분석에 따른 중점관리 항목 도출에 대한 연구는 미흡하다. 따라서 본 연구에서는 설문조사와 인터뷰를 통한 공동주택 공사의 작업지연요소를 공종별로 도출하였다. 그 결과, 골조공사와 마감공사에서는 작업자수 부족이 전기설비에서는 작업자 능력이 그리고 기계설비에서는 선행 작업 미완료가 중점관리 대상으로 도출되었다. Work delay is one of the facts that make the reliability of construction projects decrease. Therefore, it is important to classify and prioritize the delay factors. This research analyzed key delay factors in apartment house construction through survey. The results of analysis are as follows. (1) Insufficient work force is the key delay factor in structural and finish work. (2) Improper craft of worker is the key delay factor in electrical work. (3) Incompletion of proceeding work is the key delay factor in mechanical work.

강 슬리브 파단 직선 슬리브의 장력 및 열적 특성 분석 연구

안상현,김병걸,김상수,손홍관,박인표,김성규,Ahn, Sang-Hyun,Kim, Byung-Geol,Kim, Sang-Shu,Sohn, Hong-Kwan,Kim, In-Pyo,Kim, Sung-Kyu 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.11

According to previous report, aged sleeves of old transmission line showed several defaulted installation patterns, which was biased or corrosive-fractured of steel sleeve installed cases. These defects can cause serious accidents such as rapid increasing of sag or falling out of overhead conductor from sleeves. Consequently, the defects lead to the major power outage. Corrosion of steel sleeve is a typical defect by aging of sleeves. And it occupied almost 25 percent of investigated aged sleeves. This paper studied thermal properties and tension for ACSR conductor in case of fractured steel sleeve model by corrosion. The temperature distribution within overhead conductor has a specific gradient. Thermal properties of splice connectors(sleeve and clamp) showed normal behavior. However, mechanical properties were worse than normal sleeves. The detailed results were presented in the text.

PKC 활성 조절을 통한 두시 하태독법의 항염증작용이 Mite 항원 유도 아토피유사피부염 발병 조절에 미치는 효과

안상현,김기봉,Ahn, Sang Hyun,Kim, Ki Bong 대한한방소아과학회 2016 대한한방소아과학회지 Vol.30 No.4

Objectives Hataedock (HTD) is an oral Korean herbal medical oral treatment that removes fetal toxic heat and meconium from new born babies. The purpose of this study is to evaluate whether Hataedock treatment of Duchi extracts has anti-inflammation effects in atopic dermatitis-like skin lesions in House Dust Mite-Induced NC/Nga Mice. Methods The mice were divided into 3 groups (n=10 per group) as follows: the control group (Ctrl group), AD-induced group (AE group), AD-induced with HTD treatment group (DT group). 3-week-old NC/Nga mice were introduced to Hataedock treatment, made of Duchi extract. After 4 weeks, House Dust Mite-Induced application was used six times per week for 3 weeks to induce the first atopic dermatitis, and second AD in 7 weeks after. To examine skin injuries and anti-inflammatory effect, PKC, MMP-9, iNOS immunohistochemistry were used. Results The alleviate effect of the skin damage and angiogenesis was observed in DT group. The damage of stratum corneum, hyperplasia, edema, infiltration of lymphocytes and distribution of capillary were decreased in DT group. Also, the study results suggested that Hataedock treatment made of Duchi extracts in DT group remarkably decreased skin damages by 51% (p < 0.001), as well as PKC by 91%, MMP-9 by 48% (p < 0.001), iNOS by 51% (p < 0.001). Conclusions Based on the study results, we observed that Hataedock treatment of Duchi extracts alleviates AD by diminishing various inflammatory cytokines, initial steps of AD development, in the skin lesions. Potential applications for prevention and treatment of atopic dermatitis are expected.

습식법으로 제조한 인산형 연료전지 전극구조개선에 관한 연구

안상현,심재철,유덕영,이주성 ( Sang Hyun Ahn,Jae Cheol Shim,Duck Young Yoo,Ju Seong Lee ) 한국공업화학회 1997 응용화학 Vol.1 No.1

To increase performance of electrode in PAFC we try to change the electrode manufacturing method. In traditional method, dead catalyst is increased and the performance of electrode reduce. So we tried wetting process to reduce dead catalyst we made PTFE/C slurry and add Pt/C powders. In this case, the performance is better than the electrode made of traditional method.

물유리를 이용한 다공성 에어로젤 제조

안상현,김선영,유기풍,이건홍 ( Sang Hyun Ahn,Sun Young Kim,Ki Pung Yoo,Kun Hong Lee ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.2