지반의 동상특성에 관한 실험적 연구(Ⅰ)

徐祥烈 영남이공대학 1998 論文集 Vol.27 No.-

Characteristics of frost heaving were observed for the soil, filled with in the bath which had same soil, initial moisture condition and different cooling temperature. From this study, the following six conclusions were drawn. 1. The frozen depth and the frost heaving pressure increased, but the amount of the frost heave decreased with the low of cooling temperature. 2. The freezing rate varied irregularly depending on voids resulted from development of ice lens and water intake, but it generally decreased with the elapsed time. 3. The amount of frost heave increased with following of a growth of ice ice lens and was almost equal to the total thickness of ice lens. 4. The frost heaving pressure was influenced more strongly by the temperature rather than the pattern of frozen soil. 5. The influence of the external temperature became small with the increase of the frozen depth, temperature variation tended to slow. 6. The thermal movement resulted from the external temperature was mostly shifted towards freezing direction, thermal movement towards horizontal direction compared with freezing direction was very small. The data obtained from this study was based on the phenomenon of frost heave by maintaining a constant temperature. The effect of temperature on frost heave was explained sufficiently by the data, because there was no irregular environmental change as natural phenomenon.

사면 안정 해석

서상열 영남이공대학 산업기술연구소 1992 産業技術硏究 Vol.6 No.-

This study presents a method of slope stability analysis. The potential failure surfaces are taken to be of an exponential shape(log-spiral). The dependence on significent parameters of slope failure is examined and the results are presented in a number of graphs and tables. On the basis of the result obtained in this study, it is concluded that; 1) the program that is used in study is very useful in assessing the safety factor of soil slopes under static condition; and 2) The safety factor of soil slope is greatly affected by the values of the partamaters, C, φ, β, that are associated with it.

補强砂의 强度增加에 관한 硏究

서상열,김준영 영남이공대학 산업기술연구소 1992 産業技術硏究 Vol.6 No.-

To understand the increase effects on the shear strength of reinforced sand an experimental study has been conducted using the modified direct shear box, and a consideration was made on the shear strength tendensy of the reinforced and unreinforced sand, which was obtained through stress-strain relationship. The results of tests were evaluated in terms of the enhancement in shear strength of reinforced sand rather than unreinforced sand. Also shear strength increase effects of reinforced sand were greatest for reinforcement orientation of 30℃with respect to the vertical direction of specimen. It is demonstrated that shear strength increase degreeis considerably altered by tensile specific property of reinfocement.

하천부지의 효율적 이용방안 : 검단공업단지

徐祥烈 영남이공대학 산업기술연구소 1995 産業技術硏究 Vol.8 No.-

This research is concerned with how seepage through the permeable foundation stratum results upon the safety of embankment constructed on riverbed-the Kumdan industrial complex. The data from the in-situ tests, laboratory tests, and computer program are presented and discussed on the effects of seepage of an alluvial formation. Uplift pressure values were re-presented in the form of pore pressure with the aid of computer program. Emphasis was placed on assessing the influence of seepage under the riverbed embankment. In particular it is shown that: (1) some of levees are constructed on foundation composed of various kinds of alluvial materials underlaid by some form of various kinds of alluvial materials underlaid by some form of bedrock and forms sandwich typed permeable foundation formation that have potential fissuration in case that depth of low permeable upper soil stratum is shallow. (2) this kind of levees as that of the Kumdan industrial complex need to have seepage control methods that are following proposals of reducing quantity, withstanding uplift pressure and lowering piezometric head; ① sheetpile cut-off wall ② compacted barrier of impervious soil ③ grouted or injected cut-off ④ impervious wall of mixed in-place piles.

유산동(硫酸銅) 과잉투여가 백서간에 미치는 영향에 관한 전자현미경적 연구

徐相烈 연세대학교 의과대학 1970 연세의대논문집 Vol.3 No.1

지반의 동상특성에 관한 실험적 연구(Ⅱ)

서상열 영남이공대학 산업기술연구소 2000 産業技術硏究 Vol.12 No.-

Characteristics of frost heaving were observed for the soil filled with in the natural soil bath. From this study, the following conclusions were drawn. 1. The frozen thickness for soil was thought to be a constant. 2. The amount of ground frost heave increased in line with an increase of the temperature gradient. 3. In cold region, the effect of the tapered pile was low. 4. The amount of ground frost heave coincided with the amount of wate migration at the freezing front. 5. In the case of ice lens near the ground surface, the effect of a sublimation was small. 6. The pressure action on structure was a great difference with the shape of underground object.

항만공사의 연약지반개량에 관한 연구

徐祥烈 영남이공대학 1997 論文集 Vol.26 No.-

The "4th Development of Seaport on the Pusan" project involved the strengthening of soft soil in a 739,600㎡ site at the Gam-man dong of Pusan. For the design of improvement, conventional bore hole, laboratory tests and piezocones were carried out. This construction site lies over 0.0 to 22.0 m of alluvial and residual soft clay under the reclamated sand fill stratum. The coefficients of consolation obtained in the field measurement and piezocones were greater than the ones obtained in the laboratory tests. The reason for this result seems to be mixing of sand and clay at the top of clay-stratum caused by the reclamation of sand-fill.

모래의 투수성에 관한 실험적 연구(Ⅰ)

徐祥烈 영남이공대학 1987 論文集 Vol.16 No.-

Using a newly deviced permeametcr the effect of hydraulic gradient on permeability in sands was investigated, and following observation was made: 1. The flow behavior of water through uniform and graded sand is not linear between velocity and hydraulic gradient except dente sand. 2. T he relationship between permeability k and void ratio e is found to be approximately linear for uniform and graded sand. It is felt that Daroy's Law is not valid for through sand when k is not a constant but is a function of the hydraulic gradient.

한국 민간경비 인적자원 확보관리의 실태 및 개선방안

서상열,박준석 한국경호경비학회 2008 시큐리티연구 Vol.- No.16

한국의 민간경비는 법ㆍ제도적 장치와 양적 성장에도 불구하고 최근 사건‧사고의 발생으로 사회적으로 큰 충격을 안겨주고 있는 등 양적 성장에 비해, 질적인 성장은 크게 미치지 못하고 있다. 특히 지난 2월 숭례문 방화사건으로 국가 주요시설물과 문화재 등에 대한 경비문제가 부각됐으며, 국민의 생명과 재산을 지키기 위해서는 현재와 같은 치안체계에서는 국민 대다수가 요구하는 치안서비스에 경찰이 적절히 대응하지 못하는 사례가 빈번히 발생하게 되면서 치안수요자들은 부족한 치안력을 보완하기 위한 방법으로 민간경비를 활용하고 있다. 치안력 보완을 위해 민간경비업체가 성행하고 있지만 이러한 민간경비업체의 성행과 더불어 일부 대형 경비업체를 제외하고 상당수 경비업체가 영세성에서 벗어나지 못하고 있으며, 일부 문제 있는 영세업체에서는 자질이 부족한 인력을 고용하여 문제가 발생하는 등 인력관리의 문제와 더불어 불법행위도 저지르고 있어 사회적으로 불신을 받고 있는 등 대책마련이 시급하다는 지적이다. 따라서 본 연구에서는 인력관리의 중요성에 대한 깊은 인식과 더불어 인적자원 확보관리에 대한 개선방안을 다음과 같이 제시하였다. 첫째, 인력자원의 선발･채용시스템의 기준을 강화할 필요가 있다. 둘째, 우수한 인적자원의 확보로 안전서비스의 질적 향상을 유도하여야 하며, 셋째, 효율적인 승진관리의 운영으로 조직구성원들에 대한 사기앙양이다. 넷째, 우수인력 유입을 위한 전문자격제도의 도입이 필요하다.

동적하중을 받는 PILE의 지반 강성에 관한 연구

서상열 영남이공대학 1992 論文集 Vol.21 No.-

In this paper, new solution analyzing soil stiffness of the pile subjected to dynamic loading is developed by using henkel function. Thus. this solution is comparison with Novak solution. To investigate the effects of soil properties of the disturbed zone around a pile subjected to the torsional harmonic vibration, the parametric study is performed. The determination of the soil stiffness of the soil around a pile is performed by dividing the soil profile into disturbed zone and original zone. The conclusions obtained from this study are as follows: 1) Soil stiffness is greatly affected by the values of soil properties. 2) Real parts of soil stiffness is nearly not affacted by the magnitude of disturbed zone. 3) The real and imaginary parts of the soil stiffness increase as the shear modulus ratio and the poisson's ratio increase.