Soil Cement 混合物에 關한 基本的 試驗

柳時昶 진주산업대학교 1969 論文集 Vol.3 No.-

There are various methods to stabilize the soil as a construction material. Mixing cement to soil is one of them, the mixture being called "soil-cement". In this experiment, two kinds of soil samples were taken in the Taejun area and were used for compaction, strength and duration tests, giving different cement contents. In making soil-cement samples, such factors as soil gradation, the pulverization of soil, cement contesr, water content and compacting were considered. There variables were correlated with the measured values of strengths and durations. This experiment was carried out under the method specified in the A.S.T.M. standard and K.S.F standard. The results obtained in this experiment are summarized as follows. 1. The compacting effects if soil-cement is concident with the proctor's theory of optimum water content in general soil test. 2. As the cement content increases, the compressive strength of soil-cement increases almost proportionally 3. The compressive strength of soil-cement has the maximum value at the maximum dry density corresponding to the optimum water content. 4. The amount of the weigth loss of the sample due to the alternation of wetting and drying. 5. As the cement content increases, the amount of the weight loss of the sample due to the alternation of wetting and drying and that due to tha alternation of freezing and melting decreases respectively. 6. If the pulverizing and mixing abilities of machine used in marking soil-cement are improved, the quality of soil-cement will become much better. 7. On the other hand, in order to obtain the practically applicable soil-cement, the extensive field tests will be necessary. 8. The soil-cement could be suitable construction material in paving farm roads, building farm house and so forth.

Cao 混入土의 다짐에 관한 硏究

柳時昶,朴魯奭 진주산업대학교 1972 論文集 Vol.9 No.-

This study was made to obtain the optium compaction of qucklime mixed with soil and to find out the relation of the quicklime mix ratio, dry density and strength by changing the compaction rounos. The obtained results are as follows. 1. The maximum dry density of unmixed soil is not distinguishable, while that of mixed soil is distinguishable. 2. What the nincrease of quicklime mix ratio, the dry density and strength increase and the optimum cuicklime mix ratio could be obtained. 3. With the increase of compactiom rounds, the dry density and strength increase, while they decrease in a certain limit ond maximum dry density and strength could be obtained 4. While the maximum drr density and strength could be obtain 1.655 8/㎠ and 43.9Kg/㎠ with the quickime mix ratio 35%, compaction rounds 50th.

最大乾燥密度와 最適含水比에 對하여 : 남부지방을 중심으로 At the southern District

柳時昶,李裕根 진주산업대학교 1972 論文集 Vol.10 No.-

It is one of the most economical method of Soil stabilization works to compact soil, which increases soil density artificially. The result obtained in this study on the effect that optimum moisture content and plastic Linit, natural moisture content, influence upon the maximum dry density effort 36 Samples are Summarized as follows. 1. The bigger the maximum dry density is, the smaller the optimum moisture content is, on the other hand, the smaller the maximum dry density is, the bigger the optimum moisture content is, ingeneral. 2. There is a relation which is rdmax=1/[0.00895(OMC+44.73)] between the maximum dry density and the optimum moisture content, namely, the maximum dry density is increased in propertion to decrease of the optimum moisture content. 3. There is a relation which is OMC=0.438+0.395 PL and OMC=42.30-1.20Wn 4. There are relation to be the straightline which the maximum dry density decrease, on the other hand, The optimum moisture content increase in accordance with enlargement of Atter berg Limit (LL.PL.PI) in compacted soils.

저수지의 퇴사에 관한 연구 -진양지구를 중심으로-

류시창,민병향 한국농공학회 1975 한국농공학회논문집 Vol.17 No.3

With 30 excisting reservoirs in the Chin-Young area, the Sedimentation of the reservoirs has been calculated by comparing the present capacity with the original value, which revealed its reduced reservoir capacity. The reservoirs has a total drainage area of 3l4l ha, with a total capacity of 43.23 ha-m, and are short of water supply due to reduction of reservoir capacity, Annual sedimentation in the reservoir is relation to the drainage area, the mean of annual rainfall, and the slop of drainage area. The results of obtained from the investigation are summarized as follows: (1) A Sediment deposition rate is high, being about 7.03㎥/ha of drainage area, and resulting in the overage decrease of reservoir capacity by 16.1%. This high rate of deposition coule be mainly attributed to the serve denudation of forests due to disorderly cuttings of tree. (2) An average unit storageof 116mm as the time of initial construction is decreased to 95.6mm at present. This phenomena cause a greater storage of irrigation water, sinceit was assumed that original storage quantity itself was already in short. (3) A sediment deposition rate as a relation to the capacity of unit drainge area is as follow: Qs=1.27(C/A)0.6 and standard deviation is 185.5㎥/$\textrm{km}^2$/year. (4) A sediment deposition rate as a relation to the mean of annual rainfall is as follow: Qs=21.9p10.5 and the standard deviation is 364.8㎥/$\textrm{km}^2$/year. (5) A sediment deposition rate as a relation to the mean slop of drainage area is follow: Qs=39.6S0.75 and the standard deviation is 190.2㎥/$\textrm{km}^2$/year (6) Asediment deposition rate as a relation to the drainage area, mean of rainfall, mean of slope of drainage area is: Log Qs=0.197+0.108LogA-6.72LogP+2.20LogS and the standard deviation is 92.4㎥/$\textrm{km}^2$/year

流水特性에 따른 浮遊流砂의 濃度 變化(Ⅰ)

柳時昶 慶尙大學校 1982 論文集 Vol.21 No.1

To estimate the suspended sediment concentration due to the various flow characteristics quantitatively, regression equations were derived experimentally. The flow characteristics can be descrived by using Fround number, Reynold's number and Hydraulic gradient. Derived regression equations to estimate the average suspended sediment concentration are as follows: 1) by using Fround number and Reynold's number; C=3.4889 ?? Where, C : average suspended sediment concentration. Fr: Fround number. Re: Reynold's number. ??: diameter in such that the aggregate weight of all smaller grains is 65 per cent of the total weight. 2) by using Fround number and Hydraulic quadient ; C=4.6057 ?? Where, S : Hydraulic gradient. 3) by using Froud number, Reynold's number and Hydraulic gradient ; C=3.5035 ??

저수지(貯水池)의 퇴사(堆砂)에 관(關)한 연구(硏究) -진양지구(晉陽地區)를 중심(中心)으로-

류시창 ( Shi Chang You ),민병향 ( Byung Heang Min ) 한국농공학회 1975 韓國農工學會誌 : 전원과 자원 Vol.17 No.3

With 30 excisting reservoirs in the Chin-Young area, the Sedimentation of the reservoirs has been calculated by comparing the present capacity with the original value, which revealed its reduced reservoir capacity. The reservoirs has a total drainage area of 3l4l ha, with a total capacity of 43.23 ha-m, and are short of water supply due to reduction of reservoir capacity, Annual sedimentation in the reservoir is relation to the drainage area, the mean of annual rainfall, and the slop of drainage area. The results of obtained from the investigation are summarized as follows: (1) A Sediment deposition rate is high, being about 7.03㎥/ha of drainage area, and resulting in the overage decrease of reservoir capacity by 16.1%. This high rate of deposition coule be mainly attributed to the serve denudation of forests due to disorderly cuttings of tree. (2) An average unit storageof 116mm as the time of initial construction is decreased to 95.6mm at present. This phenomena cause a greater storage of irrigation water, sinceit was assumed that original storage quantity itself was already in short. (3) A sediment deposition rate as a relation to the capacity of unit drainge area is as follow: Qs=1.27(C/A)^0.6 and standard deviation is 185.5㎥/㎢/year. (4) A sediment deposition rate as a relation to the mean of annual rainfall is as follow: Qs=21.9p^10.5 and the standard deviation is 364.8㎥/㎢/year. (5) A sediment deposition rate as a relation to the mean slop of drainage area is follow: Qs=39.6S^0.75 and the standard deviation is 190.2㎥/㎢/year (6) Asediment deposition rate as a relation to the drainage area, mean of rainfall, mean of slope of drainage area is: Log Qs=0.197+0.108LogA-6.72LogP+2.20LogS and the standard deviation is 92.4㎥/㎢/year

農業機械化의 현단계와 質耕寒態

朴魯奭,柳時昶 진주산업대학교 1972 論文集 Vol.9 No.-

This was studied to investigate the usage and the custom wark on the actual condition of agricultural machinaries in chinju area, 195 farmhouses using agricultural machinaries were chosen for this purpose. Agricultural machinaries taken were power tiller, thresher and barely thresher which were generaly utilized and supplied in Korea at present. Resuts abtained were as follows. 1. Agricultural machinaries especially thresher and barely thresher were used as a custom work. 2. The custom work was used by the small farmhouse which were managed with small area of farm land. 3. The custom work rate of thresher, barely thresher and power tiller were different from the age of farmers. Most old farmers kept the high rate of the custom work of thresher and barely thresher, but young farmers who were about 30 years old kept the high rate of power tiller. 4. The rate of custom work were also different from farmer's educational level. Farmers below the primary school level kept the high rate of the ovstom work of and barely thresher, farmers aound the middle school level kept the high rate of custom work of power tiller. On the other hand the rate of custom work of power tiller were decreased above the high school level. 5. The less farmers had the average land per person of family, the more they used the custom work.

위해성에 근거한 유류오염 농지의 복원방안에 대한 고찰

유찬 ( Yu Chan Ryu ),류시창 ( Ryu Si Chang ),이근후 ( Lee Keun Hoo ),조병진 ( Cho Byung Jin ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-

In this presentation, the methods that is appropriate to remediate the farmland contaminated by petroleum hydrocarbon was considered using the case histories of the abroad. As a result of a consideration, most remediation procedures were based risk assessment and management, risk-based procedure. It is also useful to use natural attenuation mechanism to remediate petroleum-contaminated sites. However, more research efforts are demanded for developing a cost-effective and efficient technologies.

군 병원 근무자의 책임 운영기관제도 인식 수준에 관한 연구

박원필 ( Won Pill Park ),허제강 ( Je Gang Heo ),류시창 ( Si Chang Ryu ),맹순주 ( Sun Ju Maeng ) 국군의무사령부 2010 대한군진의학학술지 Vol.41 No.1

Objective: The Armed Foeces Capital Hospital is operated Military Executive Agencies from 2009.1.1 by Ministry of National Defense Policy. So that study on level of Military Executive Agencies of military hospital employee and present improvement plan. Method: Executes questionnaire to 300 The Armed Foeces Capital Hospitall employee in services to October 9 from September 16, 2009 and utilized 285 respondents questionnaire on interpretation. Analysis executes statistical analysis and interpretation and enforced frequency analysis, reliability analysis, analysis of variance (ANOVA) using SPSS 15.0 programs. Result: The Armed Foeces Capital Hospital Should consider organization culture satisfaction elevation plan and enforce. To heighten realization level of reform direction with change, Mutual understanding and persistent education for conversion of work form between director of a hospital and employees should be achieved. Should change and autonomy about first engineer's greetingㆍbudget etc.. to business system of competitive Performance first by professional worker supplement and Incentive induction for guarantee. Need to introduce 'Customer service' or 'Customer service center' etc. for customer center service and medical treatment open of common people university hospital level and establish and operate. Customers satisfaction does and should propels continuously ordinary of questionnaire. Conclusions: Also, for success of responsibility operation engine system legal. I need active support by upper echelon's Sympathy formation and field in systematic connection guideline trial.