• 물과 미래
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• 제30권2호
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• pp.28-33
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• 1997

• 한국지반환경공학회 논문집
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• 제20권9호
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• pp.5-11
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• 2019

최근 국내 도심지 지반침하 및 함몰이 빈번히 발생함에 따라 지반침하에 대한 불안감 또한 증가하고 있다. 그로 인해 GPR를 통한 지하 공동 탐지 지반함몰 모사실험 지반의 거동을 확인하기 위한 수치해석 등의 연구가 진행되고 있다. 국내의 경우 공동위험도 평가를 최근에 마련하였으나 현재의 지반상태 파악에 초점을 두었기 때문에 향후 발생할 수 있는 지반침하 및 함몰에 대한 예측을 정량적으로 하기 힘들다. 따라서 본 연구에서는 지반침하/함몰의 기하학적 변수인 공동크기와 토피두께를 변화시키며 총 30개의 case에 대한 수치해석을 수행하였다. 이 결과를 바탕으로 현재의 상태 뿐 아니라 향후 발생할 시기를 정량적으로 예측할 수 있는 방법을 제시하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.1376-1379
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• 2006

Vibro crushed-stone compacted pile (VCCP) method is one of a ground improvement technique by a vibro compaction in vertical direction with crushed stone to build up stone pile foundation in other to ensure stability of soft ground. In spite of its long applied history in geotechnical engineering division, most of studies have not been based on the reliable In-situ condition but on the laboratory tests including model tests. These model tests can express standard and ideal behavior but exceptional status that can be occur in the ground cannot be considered efficiently. This study performed the the series of trial construction to investigate the effect of VCCP method on the improvement of soft ground expecially in railroad construction site.

• 한국항공운항학회지
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• 제27권4호
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• pp.65-72
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• 2019

There is concern about the increased risk of accidents from manual investments due to ground handling service operators, aging equipment and manpower shortages. Therefore, it is necessary to improve the quality of ground treatment services and safety management at the airport. Therefore, this study analyzed the domestic and overseas ground operation status and the license handling procedure of aircraft handling business. In addition, a case study on the evaluation system of international organizations examined the applicability of the certification body to the Korean situation. It is practical in that it provides policy implications for improving the quality of groundwork not covered in previous studies. This is expected to improve the constitution, improve quality, improve airport operations, and operate safely.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2006년도 학술발표회 논문집
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• pp.358-365
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• 2006

In this study, fragility curves of continuous buried pipelines subjected to transverse PGD (permanent ground deformation) due to liquefaction are proposed. For the waterworks system, continuos buried pipelines made of ductile iron, poly ethylene, and poly vinyl chloride are analyzed and fragility curves are drawn. Fragility curves are based on the repetitive analyses results and formulated with the dominant factors of behaviour of buried pipeline. With the use of fragility curves, engineers can estimate the status of damage of buried pipeline without overall knowledge of relevant features. Especially, fragility curves proposed in this study will act as a major module of earthquake loss estimation method. Moreover, critical value of magnitude and width of transverse PGD (by which the full damage status of buried pipelines are induced) are estimated. With the use of regression curves of these values, pre evaluation of seismic safety of buried pipelines located within liquefaction hazardous region will be possible.

• 한국광학회지
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• 제12권5호
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• pp.382-388
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• 2001

1999년 5월 26일 발사되었던 우리별 3호 인공위성에는 지구관측 전자광학 카메라가 탐재되어 있다. MEIS는 직경 95 mm Mangin 망원경으로 고도 720 km에서 13.8 m의 지상화소로 48km의 폭을 3개의 서로 다른 광 대역에서 관측한다. 본 논문에서는 우리별 3호 카메라의 설계와 제작/조립 및 시험결과를 비교 분석하고, 발사후의 운영에 관련된 문제점을 논하였다.

• 한국컴퓨터정보학회논문지
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• 제24권1호
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• pp.159-166
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• 2019

Recently, the advanced development of smart devices has increased the interest in health-care, and many people are paying more attentions to disease prevention than disease treatment. Among these prevention methods, the bare body movement has received much attention, and especially walking exercise is attracting much attention because it is enjoyable without any restrictions on place and time. Walking exercise is generally divided into two types: walking on the ground and climbing the stairs. Walking up the stairs consumes much more calories compared to walking on the ground. These walking exercises have the advantage that they can be easily performed by male and female without special equipments or economic considerations. However, there is a lack of applications and systems that accurately determine such walking and stair walking and measure momentum according to stair walking. In this paper, we designed and implemented a real-time walking status analysis system using smartwatch's, pedometer, smartphone's barometer and beacons.

• 한국건설안전학회 논문집
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• 제3권1호
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• pp.18-24
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• 2020

본 연구의 목적은 지반함몰 사고를 예방하기 위한 제도 개선안을 제안하는 것이다. 이를 위해 다음과 같은 수행절차를 따른다. 첫째, 지반침하 및 지반함몰 등의 혼용되어 사용되는 용어를 정의한다. 둘째, 지반함몰 사고 현황 및 원인 분석과 강우량과 지반함몰 원인간의 상관관계 분석을 실시하여 중점관리 원인을 도출한다. 셋째, 중점관리 원인에 대한 제도 개선안을 제안한다. 그 결과, 지하관로 손상과 지하공사 부실이 중점관리 원인으로 규명되었으며, 이를 관리할 두 가지의 제도 개선안을 제시하였다. 본 연구의 결과는 향후 보다 실효성 있는 지하함몰 예방을 위한 제도개선의 기초자료로 활용될 수 있다.

• 한국환경생태학회:학술대회논문집
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• 한국환경생태학회 2004년도 학술대회지
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• pp.67-69
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• 2004

• 한국항공운항학회지
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• 제26권2호
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• pp.116-122
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• 2018

Due to the opening of Incheon International Airport Terminal 2, the operation range of ground operators is expanding and the workload is increased, which may cause a deterioration of the operation quality. Airline and airport corporations are concerned about safety delays as well as delays in flight due to delays in operations. Air traffic demand at Incheon International Airport is expected to increase steadily in the future. Therefore, this study intends to derive quality improvement plan by investigating the perception of stakeholders about the status of fishing service in order to improve service quality of Incheon airport ground handling company. The results of the analysis are expected to be used as basic data for improving quality of service.