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Planning of Memorial History Park using Abandoned Gyeongchun Line Site
Youngdae Kim,MyungSun Kim,HwanHee Lee 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
In the past, people made efforts for destroying an existing building and constructing a new one in order to improve spaces in the city center and for making space, using a space regeneration method for city regeneration. In such cases, “color” is used as a method of space regeneration, and it plays an important role considering various aspects in spatial planning, such as theme compliance, visibility, and attention, and it is an effective method that can maximize purpose, with a relatively high economic efficiency. Hwarangdae, a modern simple station located in Gongneung-dong, Nowon-gu, Seoul, is an abandoned station, which currently does not function as a station and is designated and preserved as a historical cultural property. However, the local government, thinking that it is not desirable to keep the abandoned station, is trying to rebuild it as a place for conservation and coexistence at the same time. Considering the history, cultural values, and aesthetics of the scenery of Hwarangdae abandoned station, this study was conducted to plan a memorial park using the abandoned Gyeongchun Line site. The objective was to investigate and analyze the space and color of Hwarangdae abandoned station, which is the target place to establish a space plan, and suggest the regeneration theme of Memorial History Park. The shape was composed of straight lines, curved lines, and oblique lines based on the theme of railroad; in the color aspect, the achromatic group of Gray series gave the appearance of tone on tone, complementing the feeling of calm and a reverent feeling of the historic memorial park; it was harmonized with the natural landscape using the color of yellow forsythia flowers blooming in spring as a highlight color to neutralize static and calm images. We believe that this study will be used as a reference for various projects of urban regeneration and space reconstruction, and the Hwarangdae abandoned station will be rebuilt into a better space for citizens as a recreational park.
Electrorheological properties of polypyrrole-silica nanocomposite suspensions
Young Dae Kim,Gi Gwang Hong 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.7
The electrorheological (ER) and dielectric properties of PPy-silica nanocomposite suspensions in silicone oil were investigated. Various PPy-silica nanocomposite particles were synthesized by suspension polymerization in the presence of silica nanoparticles controlling the ratio of silica/pyrrole during the polymerization. The ER response and the particle conductivity increased with the increase in the silica/pyrrole ratio, indicating that the increased particle polarization plays a role in enhancing the ER response. The dielectric properties of PPy-silica nanocomposite particles and their suspensions support that the enhanced ER response with the increase in the silica/pyrrole ratio arises from the enhanced polarization, which originates from the increased particle polarization.
( Young Dae Kim ),( Hyun Gyum Kim ),( Chu Lee ),( Hyun Il Yoo ),( Mi Seon Park ),( Soon Gyu Byun ),( Jae Suk Choi ),( Myung Mo Nam ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.10
We constructed marine forest to restore barren grounds which are expanding in the east coast of Korea using 2 methods of (1)seedlings transplantation method and (2)underwater floating ropes method. We transplanted 3 macroalgae species, Ecklonia cava, Undaria pinnatifida, and Saccharina. japonica to construct marine forest. Blade length of Undaria pinnatifida on underwater floating ropes was 56.70±8.69㎜ in April and grew 68.75±22.30㎜ in May and 70.75±14.36㎜ in July. Blade length of S. japonica was shown 97.95-143.00㎜ in April to June. Blade length of Ecklonia cava was 30.50±1.91㎜ in May, 41.55±1.84㎜ in August, 45.30±2.57㎜ in November, 2009 and 45.30±1.99㎜ in February, 2010. The survey on Dangsa area, Ulsan-city in January, 2009 found a total number of 15 algal species(1 brown algae, 14 red algae species) with the highest variety at 5m depth of A station and the lowest at 8m depth of A and B stations. The March survey showed a total of 24 species (1 green algae, 1 brown algae, 22 red algae species) with the highest variety of 11 at depths of 3m and 5m of B station and the lowest of 6 at 10m of B station. In May, total biomass was 3,755.4g (green algae 1.2g, brown algae 199.0g, red algae 3,555.2g). From January, 2009, we found that E. cava was dominant at the depths of 3m and 5m of A and B stations while Peyssonnelia capensis was dominant at the depth of 8m of A station. The 8m depth of B station was dominated by Acrosorium polyneurum. In May, Grateloupia lanceolata was dominant at 8m depth of A station while other depths were dominated by Phycodrys fimbriata. In June, the dominant species were G. lanceolata at the 3m depth, E. cava at the 5m and P. fimbriata at the depths of 8m and 10m of A station. Under B station, G. lanceolata was dominant at the depths of 3m and 5m while P. fimbriata was dominant at the depths of 8m and 10m.
The Growth of Mugil cephalus, Patinopecten yessoensis and Saccharina japonica in the IMTA System
( Young Dae Kim ),( Mi Seon Park ),( Byung Hwa Min ),( Hyung Chul Kim ),( Won Chan Lee ),( Chu Lee ),( Gi Seung Kim ),( Yong Hyun Do ),( Hyun Il Yoo ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.10
In this study, we investigated the growth of striped mullet (Mugil cephalus), Yesso scallop (Patinopecten yessoensis) and kelp (Saccharina japonica) farmed under the IMTA (integrated multi-trophic aquaculture) system developed by national institute of fisheries science (NIFS). The farmed striped mullets grew from an initial length and weight of 152.5±12.1 mm and 41.6±7.8 g in October 2013 to 154.2±5.6 mm and 47.5±8.6 g in November, 160.2±8.7 mm and 55.9±9.1 g in December and 168.4±9.6 mm and 58.4±8.7 g in January. The fish continued to grow and reached 190.2±9.4 mm in length and 87.5±8.9 g in weight in April and 256.4±9.7 mm and 156.7±6.7 g in October 2014. The daily growth rate (DGR) for total fish length was 0.015~0.1 mm/day during the periods of fast growth and attained 0.038~0.1 mm /day during February~March. The kelp grew from an initial blade length and wet weight of 1.19±0.2cm and 0.0028±0.0012 g in January 2014 to 3.3±0.8 cm and 2.5±0.9 g in February and 126.5±11.6 cm and 107.4±22.6 g in March, after which, erosion occurred and slowed the growth. The DGRs for kelp length ranged 0.03 1.9 mm /day in January 2014 and increased to 0.88~1.9 mm /day during March~April. Increasing water temperatures beginning in April lowered the DGR to 0.03 mm /day. Yesso scallops grew from an initial shell length, shell height and wet weight of 11.83±0.6 mm, 12.68±0.7 mm and in September 2013 to 19.9±2.5 mm, 20.8±2.6 mm and 0.9±0.04 g in November 2013. They continued to grow to 45.91±0.71 mm in shell length, 42.55±0.8 mm in shell height and 12.7±1.3 g in wet weight by May 2014 and 60.2±2.51 mm, 554.6±2.61 mm and 24±2.70 g by October 2014. The DGRs for shell length of Yesso scallop ranged from 0.02 to 0.256 mm/day with higher values of 0.256~0.27 mm/day during November December 2013 and March~April 2014.
( Young Dae Kim ),( Mi Seon Park ),( Byung Hwa Min ),( Seong Jae Jeong ),( Hyung Chul Kim ),( Hyun Il Yoo ),( Won Chan Lee ),( Jae Suk Choi ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.10
An eco-friendly integrated multi-trophic aquaculture (IMTA) farming technique was developed with the goal of resolving eutrophication by excess feed and feces as fish-farming by-products. A variety of seaweed species were tried to remove inorganic nutrients produced by fish farming. However, there have been few trials to use Sargassum fulvellum in an IMTA system, a species with a relatively wide distribution across regions with various habitat conditions, great nutrient removal efficiency and importance for human food source and industrial purposes. In this regard, our study tried to examine feasibility of using S. fulvellum in an IMTA system by analyzing growth characteristics of the species in an IMTA system comprising of rockfish (Sebastes shlegeli), sea cucumber (Stichopus japonocus) and the tried S. fulvellum (October 2011 - November 2012). We also monitored environment conditions around the system including current speed, water temperature and inorganic nutrient level as they may affect growth of S. fulvellum. S. fulvellum in the IMTA system, which were 15.72±5.67 mm long at the start of the experiment in October 2011, grew to a maximum of 1093±271.13 mm by May 2012. In September, seaweed growth was reduced to a minimum of 280±70.43 mm in length. Then, S. fulvellum began to grow again reaching 325±196.19 mm by November 2012. Wet weight of the seaweed was 4.01±1.89 g at the start of the experiment and reached a maximum of 109.26±34.23 g in May. The weight gradually declined to a low of 15.12±8.40 g in September 2012. Weight began to increase once more, rising to 39.27±21.69 g by November. During the experiment, the average velocity at the surface and the bottom was 6.5 cm/s and 3.4 cm/s, respectively. The water temperature ranged 5.0-23.5 ℃, which was considered suitable for growing S. fulvellum. Results of the study indicated no significant differences in inorganic nutrients between pre- and post-IMTA installation. It was thus concluded that S. fulvellum can be a suitable seaweed species to be used in an IMTA system.