• Journal of Korean Society of Forest Science
• /
• v.110 no.1
• /
• pp.22-34
• /
• 2021

The implementation of the sunset provision of unexecuted urban parks in Seoul has been postponed; however, the mentioned parks still remain vulnerable since they can be subject to development under certain circumstances. Local governments may purchase the parks to prevent their loss but are constrained due to limited resources. The purpose of this study is to prioritize the purchase of unexecuted urban parks in Seoul based on landscape connectivity, which represents the important role of allowing the movement of wildlife and providing biodiversity in urban environments. In this study, we used four potential scenarios (PB100, PB1, PA100, PA1), which reflects the degree of land cover change resulting from the implementation of the sunset provision, and the role of Han River as a conduit or barrier for wildlife movement. Landscape connectivity was evaluated by calculating current flow betweenness centrality (CFBC). This was used to rank the importance of the unexecuted urban parks in Seoul. The results demonstrated that the implementation of the sunset provision will greatly decrease the connectivity of all parks in Seoul and particularly more so for parks in the southern part of the city. In addition, the results suggested that the low connectivity of Han river will diminish the connectivity around Bukhansan Mountain in the northern part of Seoul. Our study can be used for the prioritization of purchase, since it has the ability to evaluate the anticipated vulnerability of each park's connectivity after the sunset provision.

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
• /
• 2001.06a
• /
• pp.65-67
• /
• 2001

경계층(boundary layer)은 대류권(troposhpere)의 일부분으로써 지구 표면에 직접적인 영향을 주고, 두께는 지표에서 100∼3000m이다. 고기압의 영향을 받는 지역에서 수직 경계층은 일출후부터 일몰 전까지인 낮 시간에 난류 혼합층(turbulent mixed layer), 낮 시간에 형성된 혼합층이 야간에 잔류하는 층, 야간 안정 경계층(Stable Boundary Layer:SBL)으로 나눌 수 있다(Stull, 1988).(중략)

• The Science & Technology
• /
• no.7 s.410
• /
• pp.10-17
• /
• 2003

지구상에 산재하는 고대 문명을 조사한 많은 학자들은 고대 유물을 가운데 하늘에 대한 내밀하고 복잡한 지식 체계가 숨겨져 있다는 것을 발견하고는 깜짝 놀란다. 고대인들은 동지와 하지의 일출과 일몰 및 달의 정돈 방향을 장기간에 걸쳐 지평선상의 적당한 지점에 계속 말뚝을 설치해 보면서 해와 달의 운행을 연구했다. 세월이 흐르면서 건축가들은 하늘을 충분히 이해하여 천체 운행의 한 주기 속에서 그 천체의 출몰 지점들이 갖는 관계를 알게 되었다.

• Korean Journal of Environment and Ecology
• /
• v.17 no.2
• /
• pp.133-143
• /
• 2003

The three wild populations including unrecorded two wild populations and Do-dong population, where designated as a Natural Monument NO 51, of Cotoneaster wilsonii in Ulnung Island were studied. The population at Yilmoldae, western coast of the island is in the threat by the visitors, while the population at Tonggumi is well conserved due to the geomorphologically difficult to access . The existing 25 to 50 maturing individuals are are potentially vital sources fer the island species recovery projects in the future. There are no statistical difference in the floral characteristics of the species such as both length and width of the petals, while statistical difference were shown from the leaf characteristics such as length, width and area of the leaves in the three studies areas.

• Journal of Bio-Environment Control
• /
• v.7 no.4
• /
• pp.311-323
• /
• 1998

This study was conducted to analyze the temperature characteristics under tunnel type greenhouse to cultivate watermelon in Sungju region. Air temperature of tunnel type greenhouse was descending rapidly after sunset, and the time required the air temperature inside greenhouse nearly reached the outside air temperature was about 2.5 hours. The maximum air temperature in tunnel type greenhouse, in case of high air temperature day, was exceeding 4$0^{\circ}C$ during day time. Air temperature inside greenhouse during night time could sustain about 2~3$^{\circ}C$ higher than the outside air temperature. But it was necessary to supply supplemental heat when the air temperature was below optimum growth temperature. Soil temperature in the depth of 20cm under soil surface could maintain higher than 2$0^{\circ}C$ and the variation range in a day was 3~5$^{\circ}C$, and the soil temperature descending due to irrigation was about 5~6$^{\circ}C$.

• Journal of Energy Engineering
• /
• v.20 no.4
• /
• pp.353-357
• /
• 2011

An embedded two-axis solar tracking system was developed by using AVR micro controller for enhancing solar energy utilization. The system consists of an Atmega128 micro controller, two step motors, two step drive modules, CdS sensors, GPS module and other accessories needed for functional stability. This system is controlled by both an astronomical method and an optical method. Initial operation is performed by the result from the astronomical method, which is followed by the fine controlled operation using the signals from Cds sensors. The GPS sensor generates UTC, longitude and latitude data where the solar tracker is installed. A database of solar altitude, azimuth, and sunrise and sunset times is provided by UART (Universal Asynchronous Receiver/Transmitter).

• Journal of Bio-Environment Control
• /
• v.10 no.1
• /
• pp.55-60
• /
• 2001

To investigate the effect of red light (R) and far-red light(FR) on controlling the growth of tomato transplants, height, length of 1st internode, and stem diameter of plant were measured every 12 days during 24 days of light treatment. At the end of experiment, fresh and dry weights of roots and shoots were measured. Generally, it was shown that the height of plant was suppressed by the treatment of FR. However, the effect of light-treatment time (10 or 20 min) on plant height was not significant. Stem diameter of the plant treated with R was greater than that of the plant treated with FR or the control. Dry weight ratio of shoot to root of the plant treated with R was smaller that of the plant treated with FR. R was more effective than the control, which was more effective than FR, in making the transplant compact.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.22 no.3
• /
• pp.201-206
• /
• 2022

Energy harvesting is a concept introduced in 1954 by Bell Labs in the US while conducting research on solar cells that convert sunlight into energy. Such energy harvesting technology is a technology that collects wasted or unused energy in daily life and recycles it as electric power. In particular In the case of a photovoltaic power generation system, energy harvesting can be applied by storing electricity generated by using a battery to reduce power consumption generated by the inverter in the form of loss of power generation in cloudy weather compared to sunny days. Therefore, in this paper, energy harvesting technology is applied in the low sunlight section such as sunrise, sunset, and cloudy weather to improve the amount of power generation by recovering the power that is below the minimum operating voltage of the inverter and dissipated. Accordingly, the research contents were verified through the development of systems and algorithms according to the amount of solar power generation and the development of systems and algorithms using low power generated in sunset, sunrise, and other environments.

• Knowledge Management Research
• /
• v.18 no.2
• /
• pp.1-22
• /
• 2017

Knowledge creation has become one of core assets for companies' survival and success, companies are putting their effort to find the way to stimulate sharing knowledge among their workers. In this vein, the purpose of this study was to examine the effect of supervisor support and co-worker support on knowledge sharing and the mediating effects of work engagement. 328 employees from varity of organizations located in Korea particiapted for questionnaire survey. Structural equation modeling was used to analyze the data. The result has shown that the static correlation exists between supervisor support, co-worker support and work engagement. Co-worker support had positive influences on knowledge sharing intention. However, supervisor support did not have any influence on knowledge sharing intention. There was a mediate effect of work engagement between both of supervisor and co-worker support and knowledge sharing intention. The study implies that co-worker support is important in order to improve organizational learning and work engagement as a strategy to enhance organizational performance.

• Proceedings of the Korean Environmental Sciences Society Conference
• /
• 2003.05a
• /
• pp.219-222
• /
• 2003

2002년 3월 28일과 29일에 동해 울릉도에서 존데를 이용하여 관측한 자료와 AWS 자료 등을 이용하여 얻은 이상의 결과를 요약하면 다음과 같다. 일반적인 경우와는 달리 주간에 형성된 혼합층이 일몰 후 야간까지 소멸하지 않았다. 그 이유는 구름으로부터 방출되는 장파복사로 인한 열속(heat flux)이 하층대기를 가열시켜 오히려 기온을 증가시키기 때문이다. 따라서 혼합층은 지면의 열속의 영향을 절대적으로 받는다. 또한 혼합층의 발달과 소멸에 있어서 구름의 영향을 무시할 수 없으며, 구름의 유무에 따라 대기경계층의 일변화는 많은 차이를 나타낸다. 구름 유무에 따른 지속적인 관측이 이루어진다면 더 자세한 영향을 알 수 있을 것이며, 더 나아가 해양대기경계층의 특성 연구에 도움을 줄 것으로 생각된다.