• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.12
• /
• pp.5917-5930
• /
• 2011

This study suggests Compact City type urban development strategies and planning elements with the purpose of sustainable development. The suggestions are based on analysis of the development projects promoted in the cities within Green-Belt. Following are the findings of this study: First, in the late 20th century, Compact-City has been suggested as standard of sustainable urban development in the developed countries, and this promoted urban development plans were presented in detail. Second, The development plans are suggested plan elements by urban environment, space, community, and management. It was classified as an applicable element in Green belt and Compact City type. Finally, after comparing several city development projects (Gwacheon, Uiwang, Hanam), differences and Limitations between the Compact-City type urban development. Considering analysis of this study, urban development projects in Green Belt should be prepared to sustainable Compact city type urban development.

• International journal of advanced smart convergence
• /
• v.4 no.1
• /
• pp.120-126
• /
• 2015

This research is a comparison of the characteristics of the displacement isolines due to powder-die-wall friction that arise during the compaction of ceramic powders in conventional die. It has been done using the CosmosWorks software package of the SolidWorks simulation software. The results of comparative simulation with FEM showed that the comparison of the displacement isolines and distribution of deformation of the ceramic powders. In the case of conventional uniaxial dry compaction for long length cylindrical green compact, considerable bending of the layers in the form of a cone can be observed. It is symmetry along centerline of cylindrical green compact. The distributions of the deformation of the green compacts (diameter 14 mm, height 20 mm) as a result of conventional compaction under ultrasonic vibration with power 1 and 2 kW are reduced to 4% and 6.5% when compared with conventional compaction without ultrasonic vibration respectively. Thus, density distribution can be minimized by increasing the power of ultrasonic vibration.

• Korean Journal of Plant Tissue Culture
• /
• v.27 no.3
• /
• pp.233-238
• /
• 2000

To obtain a basic information of the development of Genus Viola, morphological and histological observation of in vitro calli and cells in Viola culture cells were investigated. There were two callus types obtained by long term subculture of wild viola (Viola partrinii DC. ) petiole callus. One was friable callus - soft and pale green in color and small cells in size, and the other was compact callus - compact and deep bluish green in color, large cells in size. In scanning electron microscopic observation, friable callus was composed of voculated cell around small. cell clump, while compact callus was composed of cells filled with protoplasm Somatic embryogenesis was observed from suspension culture of the compact callus.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2008.10a
• /
• pp.1335-1336
• /
• 2008

A compact diode-pumped microchip(DPM) green light source which consist of pump LD, $Nd:YVO_4$, KTP and a built-in thermoelectric element has been fabricated for laser projection display. The volume of the source is as small as $0.7\;cm^3$ and we obtained the output power of 25mW with the average electric power consumption in pump LD of 304mW which correspond to the electrical-to-optical efficiency of 7.8%. Another approach using quasi phase matching(QPM) technique has been attempted. We obtained the output power of 90mW of green beam with 350mW pumping of a $Nd:YVO_4$ laser with 20-kHz rep. rate and 10-ns pulse duration. Detailed characteristics and issues of the DPM and QPM green light sources will be addressed.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.17 no.9 s.112
• /
• pp.895-899
• /
• 2006

A compact representation of Green function is proposed by applying the discrete wavelet concept in the k-domain, which can be used for the acceleration of scattered field calculations in integral equation methods. Since the representation of Green function is very compact in the joint spatio-spectral domain, it can be effectively utilized in the fast computation of radiation integral of electromagnetic problems. A mathematical expression of Green function based on the discrete wavelet concept is derived and its characteristics are discussed.

• Journal of the Korean Geographical Society
• /
• v.45 no.1
• /
• pp.1-10
• /
• 2010

Low-carbon green waterfront cities for overseas cases were reviewed to propose the direction for Korea. The implications suggested include energy saving by resource circulation, compact land use planning, transit oriented development, and utilization of renewable energy. These in turn suggest the following implementations; (1) Energy saving according to compact city, complex land use, and transit oriented development, (2) Renewable energy use in buildings and daily lives, (3) Expansion of green space for carbon mitigation and improved quality of life, and (4) Water and resource circulation system. We finally discussed that development of the green waterfront cities in Korea requires the fundamentals of low-carbon green waterfront cities achieved by overseas cases study and technical investigation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2021.05a
• /
• pp.557-560
• /
• 2021

In the face of the COVID-19 pandemic, the Korean Government announced the Korean New Deal as a national development strategy to overcome the economic recession from the pandemic crisis and lead the global action aginst sturctural changes. The Green New Deal related with the energy aims to achieve net-zero emissions and accelerates the transition towards a low-carbon and green economy. To this end, the government plans to promete an increased use of renewable energy in the the society at large. This paper introduces a compact-binary power plant using unused thermal energy and a control system based on Neural Network in order to accelerate the transition towards a low-carbon and green economy. It is expected that he compact-binary power plant accelerate introduction of renewable energy along with solar and wind power.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.12
• /
• pp.5946-5956
• /
• 2011

The purpose of this study is to discourage urban sprawl that optimize the use of natural resources and reduce demand for transportation, energy consumption, and also protect green and blue networks. For this purpose, this study discusses about the Sustainable Development (SD), urban systems toward SD and defines the concepts and the goals of Green Compact City (GCC). It then finds out the basic planning strategies to agree with GCC. Based on these strategies, it reviews the foreign case study, to obtain a mainly significance development of these planning strategies. As well as then conducts a questionnaire survey to experts and residents of Ulaanbaatar (UB) city to obtain a better understanding of the current condition and the most significant planning strategies in UB city. Therefore the basic planning strategies which can more suits in UB city and it could be the GCC is derived from the most complied planning strategies in other developed countries compared with most significant planning strategies in UB city.

• Journal of Powder Materials
• /
• v.19 no.1
• /
• pp.13-18
• /
• 2012

This study has been performed on the full density sintering of Fe nanopowder and the surface hardening by plasma ion nitriding. The Fe sintered part was fabricated by pressureless sintering of the Fe nanopowder at $700^{\circ}C$ in which the nanopowder agglomerates were controlled to have 0.5-5 ${\mu}m$ sized agglomerates with 150 nm Fe nanopowders. The green compact with 46% theoretical density(T.D.) showed a homogeneous microstructure with fine pores below 1 ${\mu}m$. After sintering, the powder compact underwent full densification process with above 98%T.D. and uniform nanoscale microstructure. This enhanced sintering is thought to be basically due to the homogeneous microstructure in the green compact in which the large pores are removed by wet-milling. Plasma ion nitriding of the sintered part resulted in the formation of ${\gamma}$'-$Fe_4N$ equilibrium phase with about 12 ${\mu}m$ thickness, leading to the surface hardening of the sintered Fe part. The surface hardness was remarkably increased from 176 $H_v$ for the matrix to 365 $H_v$.

• Journal of Powder Materials
• /
• v.15 no.4
• /
• pp.271-278
• /
• 2008

Sintering behavior of iron nanopowder agglomerate compact prepared by slurry compaction method was investigated. The Fe nanopowder agglomerates were prepared by hydrogen reduction of spray dried agglomerates of ball-milled $Fe_2O_3$ nanopowder at various reduction temperatures of $450^{\circ}C$, $500^{\circ}C$ and $550^{\circ}C$, respectively. It was found that the Fe nanopowder agglomerates produced at higher reduction temperature have a higher green density compact which consists of more densified nanopowder agglomerates with coarsed nanopowders. The sintering behavior of the Fe nanopowder agglomerates strongly depended on the powder packing density in the compact and microstructure of the agglomerated nanopowder. It was discussed in terms of two sintering factors affecting the entire densification process of the compact.