• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.1
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• pp.55-62
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• 2023

Internal erosion is one of the main causes of levee damage and collapse, and representative of this is backward erosion piping. This type of internal erosion accounts for one-third of the damage to levees, meaning it is important to predict and prevent it. In this work, experiments were conducted with the aim of detecting piping in advance by using a tracer. Experiments were undertaken by changing the head difference, soil diameter, and the installation of the cutoff wall. A tracer was injected twice, once at the beginning of the experiment and once after the piping occurred. A key finding was that the piping process significantly affectedthe concentration variation of the tracer in a soil layer. Hence, a tracer concentration curve monitored at downstream could provide information about piping occurrence. It is expected that the results of this study can be used to prevent levee damage and collapse caused by piping.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2006.11a
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• pp.3-6
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• 2006

In this study, 3D Design and the Structural Analysis using FEM are conducted for developing the Release Devices. On these bases the prototype devices are made and the reliability has been improved through many environmental tests.

• Electronics and Telecommunications Trends
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• v.30 no.4
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• pp.212-218
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• 2015

와이파이 콜링 서비스란 Wi-Fi 네트워크 환경에서 음성전화 및 Short Message Service(SMS) 등의 이동전화서비스를 제공하는 것으로 Subscriber Identification Mobule(SM) 카드에 부여된 자신의 이동전화번호를 그대로 사용하여 음성전화 및 문자의 착 발신이 가능한 서비스이다. 아이폰6 출시 당시 와이파이 콜링 기능을 탑재하여 이슈가 된 바 있으며, 미국의 통신사업자인 T-Mobile 등이 커버리지 보완을 목적으로 적극적으로 서비스하고 있다. 본고에서는 와이파이 콜링 서비스의 특징, 유사 서비스와의 비교, 기술방식, 서비스 동향을 알아보고자 한다.

• Research in Plant Disease
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• v.17 no.3
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• pp.265-271
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• 2011

Seven phytoplasma diseases have been occurred on floricultural crops in Korea : Ph-ch1 and Ph-ch2 of chrysanthemum, Ph-lily of lily, petunia flat stem-Korean (PFS-K) of petunia, poinsettia branch inducing- Korean (PoiBI-K) of poinsettia, statis witches' broom-Korean (SWB-K) of statis and azalea witches broom (AWB). Classification of the seven phytoplasmal diseases based on 16S ribosomal RNA (rRNA) sequences showed that floricultural crop phytoplasma disease were widespread in order of aster yellow (AY), stolbur and X-disease in Korea. In phenotypic characters, the fasciation was occurred in both monocotyledon plant of lily and dicotyledon plants of petunia and poinsettia. Besides, the fascination was occurred in Ph-lily of stolbur, petunia PFS-K of AY and PoiBI-K of X-disease. This result indicated that phytoplasma classification based on 16S rRNA and symptoms are not consistently related. The comparison of 16S rRNA sequence of the seven floricultural crop phytoplasma with five tree phytoplasmal diseases of jujube witches' broom, paulownia witches' broom, wild jujube witches' broom, mulberry dwarf, golden rain phytoplasma occurred in Korea showed as high as 88.5-99.9% homology. Among them, especially mulberry dwarf showed the highest homology with the seven floricultural crop phytoplasms. Based on this result, floricultural crop phytoplasmas were assumed to be transmitted by insect vectors from tree phytoplasmas in Korea.

• 베이커리
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• no.1 s.330
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• pp.158-160
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• 1996

• Nuclear industry
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• v.29 no.3
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• pp.91-117
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• 2009

• 베이커리
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• no.11 s.376
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• pp.100-102
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• 1999

• 베이커리
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• no.2 s.439
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• pp.138-139
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• 2005

• 월간낙농육우
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• s.58
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• pp.20-24
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• 1986

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.250-253
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• 2003

Many construction companies have been trying to extend their businesses to the development projects after IMF. Project financing was introduced to the construction market and has been popular with construction companies which can not furnish funds for project by themselves. But, there are so many problems that project financing has not been activated in the construction field. One of the main factors that disturb activation of project financing is distrust about construction management among participants. This distrust is caused by the lack of speciality, objectivity, clearness about CM. So, to process business successfully, they need specialty and objectivity for the construction management. In this research, I analyzed the role and duty of the main participants about CM in the development project ana suggested an advanced management structure in order to activate project financing in the development projects.