• 한국터널지하공간학회 논문집
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• 제5권4호
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• pp.301-312
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• 2003

이 논문은 토사지반 (연약지반)에서의 터널굴진시 터널주변에 야기되는 응력과 간극수압에 대한 거동의 이론적 고찰에 대한 연구로써 터널 굴진시 터널의 안정성 예측을 위한 접근방법에 대하여 연구, 제시되었다. 안정성에 대한 이론적인 접근방법을 이해하기 위하여 배수 및 비배수조건에서의 터널막장의 거동에 대하여서도 고찰하였으며, 실질적으로 현장에서 계측하여 얻어진 자료를 기초로 터널의 안정성에 대한 이론적 접근방법의 적용사례를 연구하고 그 결과에 대하여서도 또한 분석 평가하였다.

• 한국농공학회지
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• 제41권2호
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• pp.80-91
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• 1999

This paper presents the stress-strain , volumetric strain characteristics of the Pocheon weathered residual granite soil with variation of the initial water content under drained conditions. A series of consolidated drained triaxial compressiion tests and isotrpc compression tests with various initial water content on specimens were performed. All material parameters of Lade's double work hardening model were determined by using the results of tests. Most aspects of the soil behavior measured in the triaxial compression tests were reproduced with good accuracy by the constitutive model . Therefore double work hardening model has been shown to be applicable to weathered residual granite soil.

• Geomechanics and Engineering
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• 제5권5호
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• pp.401-417
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• 2013

The results of an experimental program regarding the effects of gradation on shear strength and volume change behavior of silty sands are presented. Consolidated drained direct shear tests were performed on two clean base sands and twelve silty sands obtained by mixing those base sands with two different non-plastic silts at various fines contents (${\leq}$ 25%). Drained shear strengths were observed to be not significantly influenced by either base sand gradation or silt gradation or fines content for the studied range. Increasing fines content has increased the volumetric contraction of specimens at similar void ratio. However, the amount of increase in volumetric contraction of silty sands were found to be affected by silt gradation when other influencing factors such as fines content, base sand gradation and mineralogy were kept the same. Moreover, the amount of increase in volumetric contraction of silty sands were also found to be affected by base sand gradation when other influencing factors such as fines content, silt gradation and mineralogy were kept the same.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 토목섬유 특별세미나
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• pp.73-78
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• 2000

The reinforced soil has been widely used for constructing retaining walls and embankment with steep slope. However, the benefits of soil reinforcing are often-restricted by a lack of good quality backfill material. In this study, plane strain compression tests were carried out to study the effects of preloading on the behavior of geosynthetic-reinforced saturated clay. For the unreinforced and reinforced soil, drained and undrained shearing tests were peformed after anisotropic consolidation in a constant strain rate. A preoading test was carried out by preloading, creep, unloading, aging and undrained shearing after anisotropic consolidation(K=0.3, σ'₃=50 kPa). It was observed that a reinforced clay, Kanto loam, can have a great initial secant modulus in undraind condition by well compaction and over consolidation. The results shown that the increasing of drained strength should be used to apply a large preloading in the case of reinforced clay.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.551-558
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• 2001

The horizontal drain method is one of methods improving reclamation ground. This method reduces consolidation time by using drained installed horizontally, and negative pressure is applied on end of these drains by vacuum pump. But, effective negative pressure still wasn't evaluated in applying this method to reclamation ground. To estimate optimum negative pressure, soil box test that make a model the in-situ by installing horizontal drains in the center is performed pressing different vacuum pressure In the laboratory, and the variations in settlement and volume of drained water through the drains during consolidation process were measured. Also, water content with distance from drain and with depth is measured after the test.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2000년도 추계학술대회 논문집(Proceeding of the KOSME 2000 Autumn Annual Meeting)
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• pp.1-6
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• 2000

This paper was studied on the crevice corrosion behavior of SS 400 in marine environment. In 0%, 2%, 3.5%, 5% NaCl solution, the aspect of the crevice corrosion and polarization behavior under the crevice corrosion was investigated. And Weight loss rate of SS 400 with crevice and non-crevice was measured according to the NaCl concentration. The main results obtained are as follows : 1) Under crevice corrosion, the corrosion potential become less noble as the concentration of NaCl solution increased. 2) The current density under open circuit potential was high drained as concentration of NaCl solution increased by 3.5% but the concentration increased over 3.5%, the current density was low drained. 3) The weight loss rate of SS400 was increased as concentration of NaCl solution increased by 3.5% but the concentration increased over 3.5%, that of SS400 was decreased.

• Journal of Chest Surgery
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• 제19권3호
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• pp.528-533
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• 1986

Total anomalous pulmonary venous connection is relatively rare cyanotic congenital heart diaease, which represents 1-4% of all congenital cardiac defects. Generally in the majority cases, severe heart failure and cyanosis develops in the early infancy. Because of high mortality in the untreated infants and surgical risk, there are still many things to be improved. Two patients with total anomalous pulmonary venous connection are presented, which we recently experienced. The one was 10 year old female with supracardiac type drained through left innominate vein, and survived the operation and continuous to do well for 1 year. The other 5 year old female with mixed type (right pulmonary vein drained via coronary sinus and left pulmonary vein through left innominate vein) was operated successfully under hypothermia and extracorporeal circulation, and followed up for 6 months without problem. It was very rare case in the literature.

• 한국환경보건학회지
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• 제1권1호
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• pp.28-31
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• 1974

A study was conducted to find out the biological contamination of wells in Chon Ho Dong areas, Seoul, Korea from May 4, 1971 through May 18 1971. Coliform groups were detected by membrane filter method and general sanitary conditions were checked. The results obtained were summarized as follows: 1) 61 wells (81.3%) out of 75 wells showed the evidence of coliform group. In urban areas it is recommended to use disinfectants for wells pretty frequently. 2) The wells in native villages were less contaminated than those in new villages established by poor people from slum areas of Seoul. 9 out of 15 wells at Song Pa Dong, which is However, at Bang E Dong's new village, 19 out of 20 wells were contaminatd by coliform groups. 3) Coliform groups were positive at 57 out of 61 open wells, while only 4 out of 14 pumping wells showed the evidence of coliform groups. 4) 38 out of 40 poorly drained wells were contaminated, however, 13 out of 25 well drained wells were coliform organisms positive.

• 한국수자원학회논문집
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• 제30권5호
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• pp.539-548
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• 1997

인공배수유역의 강우유출모의를 위한 물리적 수문모형이 DEM으로 표현된 지형정보에 근거한 TOPMODEL로부터 개발되었다. 인공배수유역에서일어날 수 있는 아홉 가지 유출 발생 시나리오가 제안되었고, 또 이것을 모형의 개발을 위해 사용했다. 모형은 배수관을 통한 유출, 지하수 유출, 지표수 유출 등으로 유출과정을 나누어서 수문거동을 추적할 수 있도록 구성되어 있다. 제안된 모형은 유역의 물리적 특성을 잘 기술하고 있고 수문학적 거동에 보다 향상된 추출능력을 제공해줄 수 있을 것이라고 사료된다.

• The Plant Pathology Journal
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• 제17권6호
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• pp.379.2-379
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• 2001