고무댐에 의한 농업용 저수지의 저수량 증대방안

윤충섭,김주범,Yoon Choong-sup,Kim Joo-bum 한국관개배수위원회 1999 한국관개배수논문집 Vol.6 No.1

IR 및 UV센서를 이용한 레이저 용접시의 실시간 모니터링 DSP 시스템

윤충섭,Yoon Choong-Sup 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.4

We designed a weld monitoring system with UV and IR sensors using a embedded DSP controller for implementing a distribution system; running stand alone and communication with outside by industrial standard protocols. Also this system provided a USB port in order to be acquiring data in PC. The user interface program in PC visualized the IR and W data in time, frequency and state space. A correlation of IR and UV signals showed closely related to weld quality. A rapid change of geometry can be found through a moving average filter. And the average value of IR signal at an interval represented a welding width and depth. Through these results, we proposed a monitoring algorithm for a integer type DSP.

축제용(築堤用)흙의 함수비(含水比) 변화(變化)에 의(依)한 다짐율(率) 및 투수계수(透水係數) 변화(變化)에 관(關)한 연구(硏究)

윤충섭 ( Choong Sup Yoon ) 한국농공학회 1971 韓國農工學會誌 : 전원과 자원 Vol.13 No.4

Compaction of soil is very important for construction of soil structures such as highway fills, embankment of reservoir and seadike. With increasing compaction effort, the strength of soil, interor friction and Cohesion increas greatly while the reduction of permerbilityis evident. Factors which may influence compaction effort are moisture content, grain size, grain distribution and other physical properties as well as the variable method of compaction. The moisture content among these parameter is the most important thing. For making the maximum density to a given soil, the comparable optimum water content is required. If there is a slight change in water content when compared with optimum water content, the compaction ratio will decrease and the corresponding mechanical properties will change evidently. The results in this study of soil compaction with different water content are summarized as follows. 1) The maximum dry density increased and corresponding optimum moisture content decreased with increasing of coarse grain size and the compaction curve is steeper than increasing of fine grain size. 2) The maximum dry density is decreased with increasing of the optimum water content and a relationship both parameter becomes rdam-max=2.232-0.02785W_ο But this relstionship will be change to r_d=ae^-bw when comparable water content changes. 3) In case of most soils, a dry condition is better than wet condition to give a compactive effort, but the latter condition is only preferable when the liquid limit of soil exceeds 50 percent. 4) The compaction ratio of cohesive soil is greeter than cohesionless soil even the amount of coarse grain sizes are same. 5) The relationship between the maximum dry density and porosity is as rdmax=2,186-0.872e, but it changes to r_d=ae^be when water content vary from optimum water content. 6) The void ratio is increased with increasing of optimum water content as n=15.85+1.075 w, but therelation becames n=ae^bw if there is a variation in water content. 7) The increament of permeabilty is high when the soil is a high plasticity or coarse. 8) The coefficient of permeability of soil compacted in wet condition is lower than the soil compacted in dry condition. 9) Cohesive soil has higher permeability than cohesionless soil even the amount of coarse particles are same. 10) In generall, the soil which has high optimum water content has lower coefficient of permeability than low optimum water content. 11) The coefficient of permeability has a certain relations with density, gradation and void ratio and it increase with increasing of saturation degree.

흙댐의 밀도변화(密度變化)에 의한 압밀침하(壓密沈下)에 대한 연구(硏究)

윤충섭 ( Yoon Choong Sup ) 한국농공학회 1986 韓國農工學會誌 : 전원과 자원 Vol.28 No.3

This study was carried out for the settlement and camber of earth dam by the changes of the density. The testing material was taken five kinds of Soil used as banking material and it was compacted by 100, 95, 90, 85 and 80% compaction degree. The results of the settlement of earth dam whose height ranges from 10m to 50m are as follows. 1. The more the fine particle (n) increases, the higher the liquid limit (W_L) and the lower the dry density (r_d) becomes as follows; r_d=2.22-0.0052n (gr/㎤) r_d=2.394-0.0164w_L r_d=2.185-(5. 8n-2. 5w_L)×10^-3 2. The higher the optimum moisture content (w_ο) becomes, the lower the density becomes as follows; r_t=2.68-0.028w_ο r_d=2.578-0.04w_ο 3. Most of the consolidation occurs immediately by loading and the more the fine particle increases, the lower the coefficient of consolidation becomes. 4. The more the fine particle increases and lower the compaction degree (D) becomes, the lower the pre-consolidation load (P_c) becomes but on the contrary the compression index (C_c) becomes higher. Those equation is as follows. P_c=3.32-(4.3n-3.0D)×10^-2 (kg/㎠) C_c=0.41+(1.33n-4.44D)×10^-3 5. The more the consolidation load (P) increases, the lower the coefficient of volume change (m_v) becomes with m_v=ap^-b, the higher the consolidation ratio (u) becomes with U=(0.6~1.35)P^0.4 6. The more the fine particle (n) increases, the more the settlement of dam occurs with U=an^b and 60~80% of the settlement occurs under construction. 7. The camber of dam has higher value in condition that has more fine particle, poorer compaction and higher height of dam. In the dam construction about twice value of table 7 is required for dam safety.

투수성(透水性) 성토재료(盛土材料)의 기계(機械)다짐에 관(關)한 연구(硏究)

윤충섭 ( Choong Sup Yoon ) 한국농공학회 1981 韓國農工學會誌 : 전원과 자원 Vol.23 No.3

The Compaction of fill dam is very important for increasing of the safty of dam. Vibration roller is used for the compaction of pervious materials such as sand and gravel. The principal objects of this study are to give a comstruction criteria of vibration roller and to find out the relationship between dry density and permeabity of pervious soil after compaction. The results in this study are summerized as follows. 1. The relationship between maximum dry density (γ_dmax) and optimum moisture content(w_ο) of modified compaction test is γ_dmax=2.74-0.064w_ο 2. The maximum dry density decrease with increasing fine particle(n) and the relative formular is n=ae^-brdmax 3. The maximum dry density is influenced more by passing rate of number 200 sieve than 4 sieve. 4. The coefficient of permeability are similar when the degrees of compaction are equal even though the spreading thickness of soil are different. 5. The coefficient of permeability(K)is greatly influence by fine particle passing number 200 sieve, and those relationship is inversely proportionate. 6. The K values of pervious soil are from 10^-3 cm/sec to 10^-4 cm/sec when degree of compaction by a modified method is from 90 to 95percent. 7. The coarser material is little influenced on the permeability with different density. 8. The increasing rate of permeability with decreasing degree of compaction is more in리-uened by fine pacticle than number 200 sieve. When degree of compaction decrease from 100 percent to 90 percent the K values of SM and GM increase about 20 times but GW increase 6 times only. 9. The effect of compaction by vibration roller is greatly influenced by 6 passes and the increasing rate of the effect is decraased at 8 passes. 10. In order to get the degree of compaction of 95 percent or more, 6 to 8 passes of roller are generally required with 30 cm thickeness of soil for 4.5 ton to 6.5 ton vibration roller and 7 to 8 passes is required with 50cm thickness for 8 to 12 ton roller.

축제용(築堤用) 흙의 밀도변화(密度變化)에 의(依)한 투수계수(透水係數)에 관(關)한 연구(硏究)

윤충섭 ( Choong Sup Yoon ),김주범 ( Joo Bum Kim ) 한국농공학회 1973 韓國農工學會誌 : 전원과 자원 Vol.15 No.1

The density of soil is one of the most important of its engineering properties, and many soil-engineering operations directed toward improving the density characteristics of matecal. This report is a study on relationship between density, permiabilty and other physical properties of compacted soil in various desity grades. The results of the study can be summariged as follow: 1. The optimum moisture content of soil increses with increasing of fine particles and a relationship between both parameter is w_ο=0.1765.n Where, n is passing percentage from #200 sieve. 2. The porosity of soil increases with increasing of optimum water content as e=aw_ο+b without having relation to compaction ratio. 3. The increment of permeability of soil is high when the compaction ratio is increased and the phenomenon is conspicuous in case of course soil and non-plastic soil. 4. The permeability of soil decreases with increasing of optrimum water content and the phenomenon is conspicuous when compaction ratio decreases. And the permeability is almost constant when optimum water content is more than 25 percent, even though compaction ratio changes. 5. The permeablity of soil increanses when the amount of fine particles is very few, the permeability is almost constant as being impervious condition without having relation to compaction ratio when there in more than 90 percent of fine particles (less than #200 sieve).

레이저를 이용한 TB 용접 생산 자동화 시스템

윤충섭(Choong Sup Yoon) 한국자동차공학회 1996 한국자동차공학회 학술강연초록집 Vol.- No.-

흙의 다짐과 Consistency에 관한 연구(硏究)

윤충섭 ( Choong Sup Yoon ) 한국농공학회 1976 韓國農工學會誌 : 전원과 자원 Vol.18 No.4

In the construction of earth dam, embankment and highway by filling, a compaction contributes to increasing the density of soil by applying pressure. The effect of compaction depends on various factors such as soil type, moisture content, gradation, consistency, and compaction energy. In this study, the correlations amone maximum dry density, moisture content, dry density, and moisture content are analyzed. Some results obtained in this study are summarizep as follows. 1. The maximum dry density sinoreases with increased of optimum moisture content and the correlations of them can be represented by; γ_dmx=a-b(W₀) 2. Maximum dry density and liquid limit show negative linear correlation and can be represented by; γ_dmx=a-b(L_L). 3. Optimum moisture content and liquid limit, plastic limit show positive linear correlation and can be represented by the following equation, W₀=a+b(L_L) W₀=a+b(P_L). 4. Liquid limit and plastic limit show positive linear correlation, and can be represented by the following equation, L_L=a+b(P_L).

조립재(粗粒材)가 흙의 다짐에 미치는 영향(影響)

윤충섭 ( Yoon Choong Sup ),김호일 ( Kim Ho Il ),김현태 ( Kim Hyun Thi ) 한국농공학회 1991 韓國農工學會誌 : 전원과 자원 Vol.33 No.4

The compaction ratio of the field dry density to the maximum dry density is generally adopted as the index of quality control for embankment of earthfill structures such as Earth Dam, Sea Dike, River Bank and Road. In case of coarse materials are included in the earth material, the compaction ratio will be varied in wide range since the dry density is influenced by quantity of coarse material in the soil. The treatment for the coarse material should be controlled carefully in testing. In this study, the compaction characteristics of the soil contained the coarse materials were researched and calibration of the suitability of field quality control methods were carried out. 28 Samples were made of clay(CL) and sandy soil (SM) mixed with gravel whose content were 0, 4, 6, 8, 10, 12, 15, 20, 25, 30, 35, 40, 45, and 60% in Weight. The compaction characteristics depending on the coarse material content were analysed through 4 types of compaction tests which are A-1, B-i, C-i and D-1. The adjusting coefficients for density and moisture content namely α and β respectively were proposed in order to consider the effects depending on content of the coarse materials. The test methods to control reasonably and promptly the quality of earthfill were proposed after analysing the ranges of possible errors on the relative compaction ratio between laboratory compaction methods and field density testing methods.

Fill Dam의 기계(機械) 전압효과(輾壓效果)에 관(關)한 연구(硏究)

윤충섭 ( Choong Sup Yoon ),김주범 ( Joo Bum Kim ) 한국농공학회 1979 韓國農工學會誌 : 전원과 자원 Vol.21 No.3

The compaction of core zone of the fill dam is very important foe increasing of the Strength of soil mass and reduction of permeability of the core. The principal objects of this study are to give the construction criteria of tamping rollers and to find out the relationships between density and permeability of soil after co-mpaction. The results in this study are summarized as follows. 1. The core zone of fill dam should be compacted more than 8 passed because the compaction effects of clayey soil increase sharply in about 8 passes of roller. 2. The coefficient of permeability (K) increases with the thickness of compaction of soil even though the density is same. 3. The effect of compaction increases with the quantity of coarse materials such as coarse sand and gravel. 4. If D values change from 100 percent to 98 percent and from 100 percent to 95 percent, K values become 2 times and 5 times of initial K value respectively. 5. The coefficient of permeability in the field soil is very high comparing with the result of laboratory test at the same 100 percent compaction ratio, but differences between both results decrease with the decrease of compaction ratio. 6. Thickness of soil layer for the compaction should be increased for heavier compaction machine. 7. In order to get the compaction ratio of 98 percent or more, 10 to 12 passes of roller is generally required with the thickness of soil from 20cm to 30cm.