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동충하초(冬蟲夏草)의 항돌연변이(抗突然變異) 활성(活性)에 관한 연구(硏究)
박성호,정지천,서운교,Park, Sung-Ho,Jeong, Ji-Cheon,Seo, Un-Kyo 대한한방내과학회 2000 大韓韓方內科學會誌 Vol.21 No.2
The fruiting bodies of Paecilomyces japonica been used for an anticancer and immuno-stimulating agent as an oriental medicine, Antimutagenecity test with SOS chromotest and antioxidant test with NBT method were carried out using the concentrated culture broth, the extract of mycelia, and that of fruiting bodies. Among the sample extracts tested, the extract of fruiting bodies was most effective to antimutagenecity against the mutagens tested such as MNNG, ethidium bromide(EtBr), 2-aminofluorene(AF) and nitrofluorene(NF). Antimutagenic activity of all the extracts were very effective against mutagen, MNNG. When the extracts were added to certain concentration, antimutagenic activity was enhanced against mutagen, MNNG and NF. Antioxidant activity of the extract from fruiting bodies was highest. However, its activity was very low, compared to ascorbic acid.
인테넷상에서 NOD 서비스를 위한 연속미디어 전송 및 푸쉬-캐싱 기법
박성호,임은지,최태욱,정기동,Park, Seong-Ho,Im, Eun-Ji,Choe, Tae-Uk,Jeong, Gi-Dong 한국정보처리학회 2000 정보처리논문지 Vol.7 No.6
In multimedia new service on the internet, there are problems such as server overload, network congestion and initial latency. To overcome these problems, we propose a proxy push-caching scheme that stores a portion of continuous media stream or entire stream, and a transmission scheme of NOD continuous media, RTP-RR and RTP-nR to exploit push-caching scheme. With the proposed push-caching scheme, NOD server pushes fixed portion of stream to a proxy when new data is generated, and the cached size of each stream changes dynamically according to the caching utility value of each stream. As a result, the initial latency of client side could be reduced and the amount of data transmitted fro ma proxy server to client could be increased. Moreover, we estimate a caching utility value of each stream using correlation between disk space occupied by the stream and the amount of data stream requested by client. And we applied the caching utility value ot replacement policies. The performance of the proxy push-caching and continuous media transmission schemes proposed were compared with other schemes using simulations. In the simulation, these schemes show better results than other schemes in terms of BHR (Byte Hit Rate), initial latency, the number of replacement and packet loss rate.
Etch Rate Dependence of Differently Doped Poly-Si Films on the Plasma Parameters
박성호,김윤태,김진섭,김보우,마동성,Park, Sung-Ho,Kim, Youn-Tae,Kim, Jin-Sup,Kim, Bo-Woo,Ma, Dong-Sung 대한전자공학회 1988 전자공학회논문지 Vol. No.
플리즈마 변수로서 가스조성과 압력 및 RF 전력이 인 및 붕소가 각각 다른 양으로 주입된 다결정 실리콘의 식각율 변화에 미치는 영향을 고찰하였다. $POCl_3$에 의해 인이 주입된 경우, 염소조성보다 불소조성이 많은 영역, 즉 $Cl_2$와 $SF_4$의 비가 17대 33일 때, 가장 큰 비등방성과 가장 작은 선폭손실을 달성하였다. 플라즈마 조건에 관계없이 주입된 불순물 농도의 증가에 다라, 인이 주입된 경우는 식각율이 증가하였고, 붕소가 주입된 경우는 식각율이 반대로 감소하였다. 또한, 급속 열처리에 의한 활성화 시간의 함수로서 인이 주입된 다결정실리콘의 식각율변화를 측정한 결과, 도우핑 농도뿐 아니라 활성화된 운반자, 즉 전자의 농도가 그 식각율 증가에 중요한 역할을 한다는 것을 확인하였다. The dependence of the etch rates of differently doped poly-Si films on the gas composition, the chamber pressure and the RF power was investigated in detail. The highest anisotropy and the lowest CD loss were achieved at the $SF_6$-rich compositions, i.e., $Cl_2:SF_6$=17:33 (SCCM), in the $POCl_3$-doped poly-Si. The etch rates increased for n-type dopant (phosphorus), while decreased for p-type (boron) with increasing the doping levels irrespective of plasma parameters. And from the results of the activation of doped poly-Si films the active carrier concentrations as well as the doping concentrations were found to be responsible for the increase of the etch rate of the phosphorus-doped poly-Si.
추진장약 수락시험시 포구속도 확률분포에 기준탄이 미치는 영향
박성호,김재훈,Park, Sung-Ho,Kim, Jae-Hoon 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.2
The purpose of this paper is to investigate the effects of calibration rounds on the statistical distribution of the muzzle velocity in acceptance test of propelling charge. It is shown that the normal distribution fits best among statistical distributions from goodness-of fit test. The 3p-Weibull distribution is also acceptable because the shape of the probability density function curve is similar to that of normal distribution and it also has near zero skewness value. Muzzle velocities of test rounds uncompensated by calibration rounds showed high variation and had comparatively higher skewness. Because the skewness of normal distribution is defined to be zero, calibration rounds make the normality of data higher.
고농도 포도당이 뼈모세포와 치주인대세포의 세포자멸사에 미치는 영향에 관한 연구
박성호,주성숙,홍정표,신제원,Park, Sung-Ho,Jue, Seong-Suk,Hong, Jung-Pyo,Shin, Je-Won 대한안면통증구강내과학회 2007 Journal of Oral Medicine and Pain Vol.32 No.4
This experiment was designed to clarify the effect of extracellular glucose on the osteoblasts and periodontal ligament cells. The cells were incubated for 24 and 48 hours with ${\alpha}$-MEM including 1,000 mg/L (control group) and 4,500 mg/L (experimental group) of glucose. Then, the expressions of caspase-3, p38 MAPK, JNK-1, and ERK-1 were examined using Elisa assay and Western blot. The results were as follows: 1. The expression of caspase-3 and p38 MAPK was increased by the high extracellular glucose in both cells. 2. The expression of caspase-3 and p38 MAPK was increased greatly in the periodontal ligament cells than the E1 cells by the high extracellular glucose. 3. The expression of JNK-1 was increased by the high extracellular glucose in both cells. 4. The expression of ERK-1 was not changed by the high extracellular glucose in both cells. These results suggest that extracellular glucose at high concentrations may inhibit the periodontal regeneration process increasing cellular apoptosis. And p38 MAPK and JNK-1 pathway may be the most responsible intracellular pathway rather than ERK-1.
박성호,이태우,박문평,Park, S.H,Lee, T.W,Park, M.P. 한국전자통신연구원 1998 전자통신동향분석 Vol.13 No.6
미래의 고도화 된 정보통신 서비스를 가능하도록 하기 위해 테라비트(Tb/s)급 광전송시스템의 구축이 예상되고 있으며, 이를 달성하기 위한 핵심기술로서 초고속 전자소자의 설계 및 제작기술의 개발이 매우 중요한 현안이다. 본 논문에서는 차세대 테라비트 광전송시스템 구현에 필요한 20-40Gb/s의 전송속도를 갖는 초고속 전자소자의 국내외 연구동향을 분석하고 앞으로의 기술 추세를 예견하였으며, 관련된 핵심 반도체 소자기술을 설명하였다.