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강성칠 ( Kang Seongchil ),한봉호 ( Han Bongho ),박석철 ( Park Seokcheol ),최진우 ( Choi Jinwoo ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2016 한국환경복원기술학회지 Vol.19 No.4
This study was carried out to the structure of plant community, and ecological succession sere of forest ecosystem in Soguemgang Valley, Odaesan National Park. Fifteenth plots(size is 20m×20m) were set up and the results analyzed by DCA which is one of the ordination technique showed that the plant communities were divided into seven groups which area community I(Quercus variabilis-Pinus densiflora community), Ⅱ(Pinus densiflora community), Ⅲ(Pinus densiflora-Quercus variabilis community), Ⅳ(Pinus densiflora-Quercus serrata community), Ⅴ(Quercus serrata community), Ⅵ (Pinus densiflora-Deciduous broad-leaved plant community), Ⅶ(Cornus controversa-Carpinus laxiflora community). Shannon diversity index per 400㎡ was to 0.7777 to 1.1440 and the age of Pinus densiflora 86 years old, Quercus variabilis was ranged from 66 to 87 years old, Quercus serrata was ranged from 51 to 62 years old, Carpinus laxiflora was 94 years old. In 2013, the succession trend was predicted Pinus densiflora→Quercus variabilis, Quercus serrata →Cornus controversa, Carpinus laxiflora. The ecological sucession progress has declined power of the Pinus densiflora and the increased power of the deciduous broad-leaved and Quercus spp. in Soguemgang Valley, Odaesan National Park. Quercus serrata and Quercus variabilis communities that judged Pinus densiflora were progressing by direction of landform. The southern slopes vegetation were progressing for Quercus variabilis, the northern slopes vegetation were progressing for Quercus serrata. In flat Valley, mainly native species of Cornus controversa, Carpinus laxiflora are predicted ecological succession for deciduous broad-leaved tree community.
A Note on Collusion and the Form of Wage Schemes
Park, Jinwoo 국민대학교 경제연구소 1997 국민경제연구 Vol.20 No.-
본 논문은 Park(1997)의 논문에서 사용된 임금구조를 일반적인 임금구조의 경우로 확장하여 부정부패를 방지하기 위한 조직의 최적구조를 살펴보고 있다. 본 논문에서 의하면 일반적인 임금구조와 Park(1997)에서 사용된 단순임금구조의 사이에는 대등결과(equivalence results)가 성립하고 있기 때문에 Park(1997)의 결과가 보다 일반적인 임금구조에서도 성립한다. The result of Park(1997) is extended for more general wage schemes such as fully or partially contingent wage schemes. We show that there exist equivalence results between wage schemes, so that the analysis can be done under simple wage schemes such as constant or bonus wage scheme. This equivalence results between wage schemes guarantees that the qualitative results do not change under more general wage schemes and complications of high dimensionality are not necessary.
Jinwoo Park(박진우),Jihyun Bae(배지현),Yonghoon Choi(최용훈) 대한치과의사협회 2018 대한치과의사협회지 Vol.56 No.2
Purpose: This study evaluated the apical root canal system of maxillary second molars, in which conventional endodontic treatment had failed. Materials and Methods: One hundred eighteen extracted endodontically failed maxillary second molars were examined to investigate the root canal morphology using clinical photographs. High-resolution cross-sectional images at the 3mm level from the root apices were taken to evaluate the anatomic variations and canal cleanliness. The incidence of anatomic variations and canals containing debris were evaluated statistically. Results: One (0.85%) maxillary second molar had four separate roots, while 52 (44.07%) had three separate roots. The remaining 65 (55.08%) showed 6 different types of fusion in their roots. As the number of fused roots increased from none to three, the incidence of isthmuses in the cross-sectional images increased significantly from 43.40% to 76.92% in 2-root fusion and 88.46% in 3-root fusion. In addition, the occurrence of less-cleansed canals increased from 22.64% to 38.46% and 53.85%, respectively (p<0.05). Sixty four teeth (54.24%) had 3 canals while 38(32.2%) had additional canals; most of them were located in the MB roots (81.58%). Seventy six (64.41%) had isthmuses in the apical region and 58 out of 76 were located in MB roots. Condlusions: Logistic analysis indicated that the less division of roots was associated significantly with the occurrence of insufficient cleaning during endodontic treatment (OR=1.765, p<0.05), while the presence of an additional canal showed no association.
Park, Myungjoon,Park, Junsik,Choi, Joungcheul,Kim, Jinwoo,Jeong, Seonghoon,Seung, Manho,Lee, Seokkiu,Kim, Jingook [Institute of Electrical and Electronics Engineers 2019 IEEE transactions on electromagnetic compatibility Vol.61 No.1
<P>Voltage noise and operation errors in an integrated circuit (IC) due to electrostatic discharge (ESD) events were measured, validated, and analyzed in this paper. A simplified structure of a laptop personal computer and an IC with a D-type flip-flop were designed and manufactured for the experimental tests. Every signal input to the IC was simultaneously measured during the ESD tests, and validated with the simulated results using a full-wave solver and a simple circuit model. Next, SPICE simulations were conducted using the measured voltages with ESD tests. The output waveforms and the statistical occurrence ratios of the operation failures found from the SPICE simulations were compared with measured values. Furthermore, the effects of decoupling capacitors on the IC operation failures due to ESD were investigated.</P>
Prediction of Land Use/Land Cover Change in Forest Area Using a Probability Density Function
Jinwoo Park,Jeongmook Park,Jungsoo Lee 강원대학교 산림과학연구소 2017 Journal of Forest Science Vol.33 No.4
This study aimed to predict changes in forest area using a probability density function, in order to promote effective forest management in the area north of the civilian control line (known as the Minbuk area) in Korea. Time series analysis (2010 and 2016) of forest area using land cover maps and accessibility expressed by distance covariates (distance from buildings, roads, and civilian control line) was applied to a probability density function. In order to estimate the probability density function, mean and variance were calculated using three methods: area weight (AW), area rate weight (ARW), and sample area change rate weight (SRW). Forest area increases in regions with lower accessibility (i.e., greater distance) from buildings and roads, but no relationship with accessibility from the civilian control line was found. Estimation of forest area change using different distance covariates shows that SRW using distance from buildings provides the most accurate estimation, with around 0.98-fold difference from actual forest area change, and performs well in a Chi-Square test. Furthermore, estimation of forest area until 2028 using SRW and distance from buildings most closely replicates patterns of actual forest area changes, suggesting that estimation of future change could be possible using this method. The method allows investigation of the current status of land cover in the Minbuk area, as well as predictions of future changes in forest area that could be utilized in forest management planning and policymaking in the northern area.