JPEG 정지화 코덱 구성 ( Implementation of JPEG Still Picture Codec )

박상규,신현식,정해원 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.1

쑥 수집종의 형태적 형질과 RAPD분석에 의한 분류

박상규,정봉환,김홍식,조용구 韓國藥用作物學會 2005 한국약용작물학회지 Vol.13 No.6

쑥 수집종 80개를 대상으로 형태적 형질과 RAPD 분석을 하였고, 유전적 다양성을 이용하여 유연관계를 분석하고 이를 기초로 품종군을 분류하였다. 주요 형태적 형질을 이용하여 쑥 수집종에 대한 군집분석 결과, 군집간의 치대거리 0.82를 기준으로 하여 분류하였을 때 5개 군으로 분류하였는데, I군에 10개 (15%), II군에 30개 (37.5%), III군에 20개 (25%), IV군에 3개 (4%), V군에 4개 (5%)를 나타내었다. RAPD분석에 이용한 10-mer primer 에 대하여 98개의 밴드를 얻었고, 그 중 다형성을 보인 밴드는 68개로 69%였는데, 선발된 Primer에서 증폭된 밴드 수는 8~11개로 다양하였으며, 평균 9.8개였다. RAPD에 의한 군집 분석에서 유연계수 0.63을 기준으로 하여 구분한 결과 6개의 군으로 분류되었다. I, II군이 각각 전체의 34%, 36%를 차지하여 가장 큰 군으로 분류되었고, 나머지 III~V군은 모두 소군으로 15%가 속하였다. 특히 I군에는 약쑥이 많았고, II군에는 뺑쑥이 많이 분포하였다. This study was conducted to classify 80 Artemisia spp. collections based on morphological characters and RAPD analysis to get the basic information of Artemisia spp. collections as medicinal plants. The eighty Artemisia spp. collections were classified into 5 groups with the maximum distance 0.82 between clusters based on the complete linkage cluster analysis with morphological traits. Out of 80 operon primer, 10 primers showing polymorphic bands were selected for RAPD analysis. Among the 98 bands amplified with the primers, 68 (69%) bands showed polymorphism. The number of amplified bands ranged from 8 to 10 with an average number of 9.8 bands. Artemisia spp. collections classified into 6 groups with the similarity value of 0.63 in dendrogram derived from the cluster analysis based on RAPDs. Group consisted of 29 collections. Group, which is the largest one, contained 40 collections. Most of the A. asiatica and A. feddei LEV et VNT. were classified into Group and. The rest of the collections (31%) were classified into Group III~V.

매우 짧은 펄스를 이용한 RZ 포맷 광전송의 성능과 전송용 광섬유의 색 분산과의 상관관계

박상규,정제명 한국통신학회 2001 韓國通信學會論文誌 Vol.26 No.11

The dependence of the performance of 40-Gb/s optical transmission using short pulses on the fiber chromatic dispersion is numerically studied. When very short pulses are used, the wide spectrum of the optical signal and the chromatic dispersion of the fiber interact in such a way that results in the reduction of nonlinear impairments of the transmission performance. The degree of this reduction is determined by the combined effects of chromatic dispersion of the fiber and the strength of the optical signal and the transmission distance. When 3ps-long pulses were used for the transmission, the eye-closure penalty was highest with the dispersion D=4ps/nm/km. 매우 짧은 펄스를 이용한 40-Gb/s 광전송의 성능과 전송용 광섬유의 색 분산과의 관계를 컴퓨터 시뮬레이션을 사용하여 연구하였다. 매우 짧은 펄스를 사용할 경우 펄스매우 짧은 펄스를 이용한 40-Gb/s 광전송의 성능과 전송용 광섬유의 색 분산과의 관계를 컴퓨터 시뮬레이션을 사용하여 연구하였다. 매우 짧은 펄스를 사용할 경우 펄스의 넓은 스펙트럼이 광섬유의 색분산과 어우러져서 광섬유의 비선형성에 의한 신호의 왜곡이 억제된다. 이러한 억제의 정도는 광섬유의 색분산, 광신호의 세기 그리고 전송거리 등에 의해 복합적으로 결정된다. 3ps의 길이를 갖는 펄스가 사용되었을 경우 장신호의 세기가 너무 높지 않을 때, 눈 잠김 페널티는 광섬유의 색분산이 D=4ps/nm/km일 경우 가장 컸으며 그 양쪽으로 패널티는 줄어들었다.

산업용 구조물의 방진장치 성능 평가 방법에 관한 연구

정정교(Jeoung-Kyo Jeoung),박해동(Hae-Dong Park),김두훈(Doo-Hoon Kim),최현(Hyun Choi),박상규(Sang-Kyu Park) 한국소음진동공학회 2000 한국소음진동공학회 학술대회논문집 Vol.2000 No.11

내연기관 연소실내에서 이온전류의 발진특성에 관한 연구

박상규(Sang Kyoo PARK),정성찬(Sung Chan CHUNG) 전남대학교 수산과학연구소 1994 수산과학연구소논문집 Vol.3 No.-

The measurement of ionization current (IC) in internal combustion engine (ICE) cylinder is one of perspective methods of combustion control. There are a number of researches utilizing the ionization probe as a sensor for the burning quality measurement and knocking regime detection in spark ignition engine (SIE) and diesel engine (DE). The spark plug and glow plug as ionization probe can be used for spark ignition engine and diesel engine. It is known that the peak of chemical ionization of combustion products occurs immediately behind front flame when front flame propagates through fuel-air mixture. The electrical conductivity of combustion products sharply increases in the range of peak. The combustion processes and the moving of combustion products in cylinder are accompanied as a rule by oscillation phenomena. In this paper, the nature of these oscillation is analyzed by comparing of pressure and IC measurements. It is shown that the principle oscillation of regular type as entropy waves. acoustic oscillation and relaxation oscillation when gas flows from half-closed volume(for example from DE prechamber) can exit in cylinder.

복잡성이론의 조직환경연구에 대한 적용가능성

정진헌(Jeong Jin Heon),박상규(Park Sang Gyu) 한국정부학회 1999 한국행정논집 Vol.11 No.2

신경세포 분화에서 세포주기 조절인자로서의 NELL2 유전자의 역할

정미림,오연미,박우생,박상규 대한소아청소년과학회 2006 Clinical and Experimental Pediatrics (CEP) Vol.49 No.10

목 적 : 신경세포 분화에 있어 NELL2가 세포 주기와 세포자멸사에 어떤 영향을 미치는지를 규명하고자 하였다. 방 법 : HiB5 세포에 NELL2를 전달감염시켜 배양하여 세포수를 측정하였다. 세포자멸사를 분석하기 위해 DNA 분절검사를 시행하였으며 PI염색으로 DNA양을 측정하였다. 세포주기의 조절에 관여하는 단백질에 대한 NELL2의 효과를 측정하기 위하여 Western blot과 면역염색을 시행하였다. 결 과 : NELL2를 전달감염시킨 군에서 세포수가 의미가 있게 적었고 DNA 분절검사에서 세포자멸사를 확인하였으며 G1 정지가 증가하였다. Western blot과 면역염색결과 Rb단백, p53, E2F1(KH-95)이 NELL2를 전달감염시킨 군에서 증가하고 cyclin D가 NELL2를 전달감염시킨 군에서 감소하였다. 결 론 : HiB5 세포에서 NELL2에 의하여 일정 수준에서의 세포자멸사가 동반되고 세포 주기에 있어 G1기의 정지가 일어나며 세포주기를 조절하는 단백질의 변화가 발생함을 확인하였다. 따라서 NELL2가 뇌에서 신경세포 분화에 중요한 역할을 할 걸로 생각된다. Purpose : Because NELL2 expression is strictly restricted only in neurons in developing and post- differentiated neural tissues, it is thought to be involved in the neuronal differentiation during development and in the maintenance of neuronal physiology in the post-differentiated neurons. In this study, we examined whether NELL2 is involved in the regulation of cell cycle and apoptosis in the hippocampal neuroprogenitor HiB5 cells. Methods : Effects of NELL2 on the cultured HiB5 cell numbers, DNA fragmentation, and proteins involved in the regulation of the cell cycle were measured. Results : NELL2 induced a decrease in cell numbers and an increase in G1 phase arrest. Moreover, transfection of NELL2 resulted in an increase of DNA fragmentation that shows an evidence of apoptosis. Contents of proteins involved in the regulation of cell cycle were also changed by transfection of NELL2 expression vectors. Conclusion : This study suggests that NELL2 plays an important role in the regulation of cell cycle and apoptosis of neurons.

Seasonal and diel abundance and feeding patterns of Chaoborus flavicans in Sang-Chun reservoir

정가람,박상규 한국통합생물학회 2010 Animal cells and systems Vol.14 No.4

To document the basic ecological aspects of Chaoborus species, which has never been reported in Korea, we attempted to identify the species, to monitor seasonal and vertical dynamics, and to elucidate trophic relations of the species in Sang-Chun reservoir. Using morphological characteristics, we identified the collected samples as C. flavicans. Also, we compared the distribution of C. flavicans, Daphnia rosea and chlorophyll a to observed seasonal dynamics. The increase of C. flavicans was observed 1-2 weeks after the increase of D. rosea. Survey of diel vertical migration patterns in the summer season showed that C. flavicans were in hypolimnion at daytime, but moved to the epilimnion at night. Finally, to determine trophic relationships in Sang-Chun reservoir, additional studies on the food web were undertaken by stable isotope analysis. Chaoborus flavicans Ⅰ-Ⅱ instars appear to be filter feeders based on carbon isotope values. Trophic levels of C. flavicans Ⅲ-Ⅳ instars were shown to be higher than other zooplankton based on nitrogen isotope values.

Secondary Productivity of Pelagic Zooplankton in Lake Paldang and Lake Cheongpyeong

강지순,박상규,양동우,주성배,남성진,정가람,박혜경 한국생태학회 2009 Journal of Ecology and Environment Vol.32 No.4

We estimated monthly and annual secondary productivity of pelagic zooplankton in Lake Paldang and Lake Cheongpyong. Secondary productivity was calculated by combining estimated zooplankton biomass and biomass-specific productivity for each site and depth from March to November 2008. In addition to somatic production, we measured production of eggs and exuviae for three dominant species: Daphnia galeata, Bosmina longirostris, Cyclops sp. In terms of biomass, B. longirostris was dominant in Lake Paldang in April and May, B. longirostris showed explosive biomass growth, especially in May. In June and July, B. longirostris and D. galeata were both dominant. Lake Cheongpyeong showed much lower zooplankton biomass than Lake Paldang. In August, there was little or no biomass in both lakes probably due to heavy rain. The Gyeongan River contributed most of the secondary productivity and B. longirostris contributed the most secondary productivity in Lake Paldang. D. galeata also contributed in the Gyeongan River, the South Han River and at the Paldang Dam in spring and fall. Overall, Lake Cheongpyeong showed lower secondary productivity than Lake Paldang. B. longirostris made the largest contribution to secondary productivity in the Cheongpyeong Dam area while D. galeata contributed the most near Nami Island. Somatic production constituted ~80% of the total secondary productivity (the sum of somatic, egg and exuvia production) for D. galeata and B. longirostris. Although production-to-biomass (P/B) ratios were usually <<1, B. longirostris sometimes showed very high P/B ratios, probably due to fish predation. D. galeata showed much lower P/B ratios than B. longirostris after the summer at most sites.

Ionization Probe를 이용한 디젤 기관의 연소해석(Ⅰ)

채재우,박상규,정성찬,정영식,김형수,박재근 한국자동차공학회 1994 한국자동차공학회 학술강연초록집 Vol.- No.-