• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.8 s.111
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• pp.713-718
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• 2006

We designed and fabricated, in this paper, a quintuple band folded monopole antenna for the mobile phone handset that can be provided multiple mobile services. Antenna design was based on the compensation of series antenna capacitance with the expansion of physical antenna length by the proper folding structure. It's shown that this antenna satisfies quintuple service band as CDMA/GSM/DCS/USPCS/WCDMA, and is more cost competitive than conventional metal plate pressing method by applying on flexible PCB technology. Measured maximum gain on quintuple band were $-2.51{\sim}+1.82 dBi$, and radiation patterns were also shown nearly omnidirectional on all bands.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.5
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• pp.221-227
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• 2013

In this paper, Satellite DMB/WiBro antenna and PCS/WiBro antenna improving indoor coverage for mobile services are designed and fabricated. Satellite DMB/WiBro bands repeater antenna and PCS/WiBro bands repeater antenna are proposed as a simple radiator with loading capacitor to generate LHCP(Left Hand Circular Polarization). The proposed antenna for Satellite DMB/WiBro and PCS/WiBro bands communication are fabricated by copper plate uploader type and substrate uploader type. The designed and fabricated antenna has a bandwidth of 70MHz at 1.816GHz~1.886GHz and bandwidth of 107MHz at 2.247GHz~2.354GHz. Maximum gain of radiation pattern was up to 5dBi.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.4
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• pp.123-127
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• 2009

Cognitive Radio rules provide that the user outside service region should not utilize communication system in Cognitive Radio environment. The reason why main user should use service without any loss and interference. If this rule is guaranteed, CR users are able to be offered enough services outside service region. In this paper, we target the issue which can operate practical cognitive systems even without causing excessive interference to legacy users. Also, we focus use on non-interference to the primary system rather than realizable benefits for the secondary systems, and using the proposed device. In this paper, we present the possible scheme using Bi-directional Beamforming Antenna.

• Research in Plant Disease
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• v.21 no.4
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• pp.334-336
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• 2015

Sclerotium rot on Pulsatilla koreana was observed in the exhibition field of Jinju Agriculture Technology Center in July 2013. The infected plants showed water-soaked, blighted and rotted symptoms. White mycelial mats spread over lesions, and then numerous sclerotia were formed on flower stalk and flower stem near the soil line. The sclerotia were globoid in shape, 1-3 mm in size and white to brown in color. The optimum temperature for mycelial growth and sclerotia formation on PDA was $30^{\circ}C$ and the hyphal width was $4-8{\mu}m$. The typical clamp connections were observed in the hyphae of the fungus grown on PDA. For molecular identification, the complete ITS rDNA sequence of the causal fungus was sequenced and analyzed. On the basis of mycological characteristics, ITS rDNA sequence analysis, and pathogenicity to host plants, this fungus was identified as Sclerotium rolfsii Saccardo. This is the first report of sclerotium rot on Pulsatilla koreana caused by S. rolfsii in Korea.

• FLOWER RESEARCH JOURNAL
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• v.18 no.3
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• pp.211-215
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• 2010

A new spray chrysanthemum(Dendranthema grandiflorum) cultivar 'Magic' was developed from a cross combination between 'Artist Pink' and 'SP0347' by selection of seedlings and lines at the Flower Research Institute, Gyeongnam Agricultural Research and Extension Services(ARES) from 2003 to 2007. Its characteristics were investigated three times from 2005 to 2007 under condition of forcing culture in spring and retarding culture in autumn. The natural flowering time of 'Magic' was October 26th, and year-round production was possible by day length treatment. Its capitulum was 6.1 cm in diameter, and had 31.9 ray florets and 11.7 head per stem in autumn. Its ray floret was white-purple with yellow green central zone. Days to flower of 'Magic' was about 43 days in spring, and 'Magic' showed the vase life of 20.6 days in autumn. This cultivar was registered for a commercialization in 2007.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.3 no.2 s.5
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• pp.95-104
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• 2004

This paper describes the design, fabrication, and measurement of a omni-directional beam pattern antenna for base station of the BIS which is one of the ITS services. The antenna is installed on the signal lamp of important crossroad and provides the wireless communication link between vehicles and RSE(Road Side Equipment). The required characteristics of BIS base station antenna are omni-directional beam pattern and specific beam pattern by the road and install environment and installed place of OBU. To get omni-directional beam pattern of antenna, Array configuration and OMA are applied. The measured results of fabricated antenna are as follows; return loss of 640MHz by -10 dB, and a gain of 10.3dBi. It is found that the measured beam patterns are similar to design results.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.23 no.2
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• pp.235-253
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• 2012

The library circulation service, which refers to the lending of library material outside of the library, is a basic and essential service provided by the library. However, changes in the library circulation service are being made according to a more management-oriented operation and the development of information technology. Consequently, the library faces a paradigm shift 'from library-centered service' to 'user-oriented service' and experiences changes in library circulation service due to the growth of library networks. Also, each library, in order to respond to the changes, tries to specialize the library circulation service by utilizing available library resources. In that context, this study, through the case study of the "Chack DanBi" library circulation service of Eunpyeong Public Library, investigates and analyzes the changing library circulation service according to the above perspectives; seeks the meaning of the service; and aims at enhancing our understanding of the library circulation service.

• Journal of the Semiconductor & Display Technology
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• v.22 no.4
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• pp.99-102
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• 2023

In this paper, the system is proposed and implemented to share the part number, the part name, and the vehicle type through the improvement sharing bulletin board for automobile repair and maintenance. And when photos of damage parts are uploaded to the system, the system analyzes it using a deep learning model to analyze whether it is damaged and automatically classify the type of damage. By providing repair and maintenance quotes for a significant part, the system provides economically repaired by providing comparative adjustment information on repair costs to drivers who are particularly concerned about the market prices of parts and maintenance services. Through the existing bulletin board, you can exchange and share information about parts by sharing various information on repair and maintenance. This paper provides in detail the average market price per type of damage during automobile repair and maintenance, helping drivers who do not know the details of parts and maintenance services to receive reasonable quotes by providing price information.

• ETRI Journal
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• v.29 no.2
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• pp.162-168
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• 2007

A new scheme for bi-directional HDTV/Gigabit Ethernet/CATV transmission over a hybrid dense-wavelength-division-multiplexing passive optical network (DWDM-PON) is proposed and demonstrated. It is based on injection-locked vertical-cavity surface-emitting lasers and distributed-feedback laser diodes as transmitters. Services with 129 HDTV channels, a 1.25 Gbps Gigabit Ethernet connection, and 77 CATV channels are successfully demonstrated over 40 km single-mode fiber links. Good performance of bit error rate, carrier-to-noise ratio, composite second order, and composite triple beat is achieved in our proposed bidirectional DWDM-PON.

• Asia pacific journal of information systems
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• v.10 no.3
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• pp.61-77
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• 2000

World Wide Web(Web) supports bi-directional communication between corporations and consumers. In the year of Electronic Commerce, close relationships with consumers are more emphasized for corporations. Nowadays, corporations compete with corporations which are located in whole world through the media called Internet. In this competitive environment, to attract consumers' attentions, it is required to develope corporations' Web sites in the way to stimulate consumers' purchase intentions. To verify the elements needed to stimulate consumers' purchase intentions factors which influence consumers' purchase intentions were analyzed. Adaptation, shopping convenience and assurance-reliability were found to be positive factors for consumers' purchase intentions. It was also found that consumers' purchase intentions in electronic commerce market are influenced by previous shopping experiences. Consumers who have previous shopping experiences are mainly influenced by good delivery systems and shopping environments while who have no experiences are influenced by consumers' risks such as performance risk and personal and privacy risk when they intend to purchase products or services.