• 자원리싸이클링
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• 제22권6호
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• pp.64-72
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• 2013

본 연구는 고정탄소 57.39%의 미립 석탄으로부터 고품위 석탄 생산의 가능성을 확인하고자 하여 광물학적, 물리화학적 방법과 단체분리도의 특성을 파악하여 청정 석탄 기술의 처리과정에서 회분을 감소시키는데 목적이 있다. 본 연구에서 일반부선과 미립자 처리에 적합한 column 부선기의 최신형인 CPT column 부선을 적용하여 기포제, 포수제, 억제제의 종류와 첨가량의 변화, 공기주입량, 급광량 그리고 광액농도에 따른 영향을 확인하였다. 먼저 광액농도 20%, 포수제 DMU-101 (100 mL/ton), 기포제 AF65(300 mL/ton), 억제제 sodium metaphosphate(1 kg/ton)의 실험조건으로 일반부선을 실시한 결과, 회분제거율과 가연분회수율(combustible recovery)을 각각 67.57%와 70.90%를 얻었으며, 광액농도 3%, 포수제 DMU-101(100mL/ton), 기포제 AF65(10 L/ton), 억제제 sodium metaphosphate(1 kg/ton), 세척수(100 mL/min.)와 공기주입량(1,200 mL/min.)인 조건에서 CPT column 부선을 실시한 결과 회분제거율과 가연분회수율이 각각 85.59%와 88.97%인 결과를 얻었다.

• 한국지반공학회논문집
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• 제23권3호
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• pp.61-75
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• 2007

우리나라에서는 암반 및 자갈층과 같은 단단한 층 내에 깊은 기초를 매입하는 것이 일반적이다. 그러나 Chaophraya(Bangkok)와 Mississippi강 삼각주에서 실시되고 있는 것과 같이, 대심도 낙동강 삼각주 퇴적토에서도 말뚝의 지지층으로써 중간 깊이에 위치하는 모래 및 모래질 자갈층을 고려할 필요가 있다. 이 연구는 이 지역에서 PHC 말뚝을 요구하는 깊이까지 항타할 때, 말뚝의 지지력을 위한 적절한 평가법을 찾고자 하였다. 지반조사는 두 현장의 5개소에서 실시되었다. 말뚝의 지지력은 지반조사 결과를 이용하고 CPT에 근거한 평가법과 여러 다른 해석법을 적용하여 계산되었으며, 상호 비교가 이루어 졌다. 항타된 5개의 말뚝에 대해 매입된 전 깊이에 걸쳐 잘 알려진 PDA시험이 체계적으로 수행되었다. 여러 평가법에 의하여 계산된 지지력은 PDA 및 정재하 시험결과와 함께 비교되었다. 그 결과, 주면마찰력은 set-up 효과에 따라 지배적으로 영향을 받으며, 장시간 경과 후에는 $\beta$법에 의한 결과와 좋은 일치를 보였다. 선단 지지력은 과소평가되는 PDA시험 보다는 정재하시험결과에 근거하여 적절한 평가법을 선정하였다. 최종적으로, CPT결과를 이용하여 이 지역에 적합한 지지력의 평가법을 도출하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 Proceedings of the Korea Automatic Control Conference, 11th (KACC); Pohang, Korea; 24-26 Oct. 1996
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• pp.417-421
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• 1996

A new concept of 22.9kV class revenue metering system based on the optical sensing technique was designed and implemented. This paper reports on the performance of a 22.9kV class three phase optical current/voltage metering scheme and three tariff metering system. This optoelectronic system was designed and developed to advance the state of the art in revenue metering. This paper deals with the characteristics of designed optical CPT (Current and Potential Transformer) and optoelectronic demand meter. The extensive field evaluation of the developed system with the existing oil filled transformer and solid state metering pair is undertaking. Upto now the operation of the optical revenue metering system under the field condition compares favorably with the existing system.

• International Journal of Quality Innovation
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• 제5권2호
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• pp.63-69
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• 2004

This is an R&D project on design optimization of the inner shield of the Omega color picture tube at Samsung SDI in Korea. This was an R&D project which basically used the IDOV (Identify, Design, Optimize, Validate) process for Six Sigma implementation. Most Six Sgima projects use the process of DMAIC (Define, Measure, Analyze, Improve, Control). However, this project introduces a new cycle, RDIDOV (Recognize, Define, and IDOV). Here CPT means Color Picture Tube. Sam sung SDI is one of the two companies which began Six Sigma in Korea. This case study shows a good example how an R&D Six Sigma project can be usefully employed in manufacturing companies using a new process cycle.

• 아동학회지
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• 제20권4호
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• pp.159-177
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• 1999

This study analyzed children's personality types with the use of the Murphy-Meisgeier Type Indicator for Children(MMTIC: adapted for Korea by Kim, 1993) and examined their relationship to the Torrance Tests of Creative Thinking(TTCT-figural, form A) and the Creative Personality Test(CPT: Yim,1997). Subjects were 210 third- and 218 sixth-grade students. Data were analyzed by one-way ANOVA and t-test. Personality types Sensation/Judgment(SJ), Sensation/Perceiving(SP), iNtuition/Thinking(NT) and iNtuition/Feeling(NF) differentiated the eleboration, originality, and flexibility dimensions of creative thinking. There were gender differences in the relation of personality type NF to elaboration and fluency. There were age differences in personality types SP and NF in relation to elaboration. Personality types differentiated between the independence, openness, attachment and adventurousness dimensions of the CPT. Age differences in personality type SP differentiated independence and type NT differentiated attachment dimensions of creative personality.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.1218-1223
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• 2006

In this study a series of in-situ and laboratory tests such as SPT, CPT, DMT and oedometer test are performed and then the stress history of soft ground is evaluated from the different method for estimating preconsolidation pressure. Casagrande method(1936), which is generally used in the conventional design, overestimates to the known preconsolidation pressure but Becker method(1987) similarly estimates to the known values. Also the results of DMT is similar to that of Becker method, and SPT and CPT overestimates the stress history of investigated ground.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.466-475
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• 2006

Reliability analysis between safety factor and reliability index for driven and bored pile load capacity was analyzed in this study. 0.1B, Chin, De Beer, and Davisson's methods were used for determining pile load capacity by using load-settlement curve from pile load test. Each method define ultimate, yield and allowable pile load capacities. LCPC method using CPT results was performed for comparing with results of pile load test. Based on FOSM analysis using load factors, it is obtained that reliability indices for ultimate pile load capacity were higher than those of yield and allowable condition. Present safety factor 2 for yield and allowable load capacities are not enough to satisfy target reliability index $2.0\sim2.5$. However, it is sufficient for ultimate pile load capacity using safety factor 3.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.44-49
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• 2004

The settlements of footings in send are often estimated based on the results of in-situ tests, particularly the standard penetration test (SPT) and the cone penetration test (CPT). In this paper, we analyze the load-settlement response of vertically loaded footings placed in sands using both the finite element method with a non-linear stress-strain model and the conventional elastic approach. Calculations are made for both normally consolidated and heavily overconsolidated sands with various relative densities. For each case, the cone penetration resistance qc is calculated using CONPOINT, a widely tested program that allows computation of qc based on cavity expansion analysis. Based on these analyses, we propose a procedure for the estimation of footing settlement in sands based on CPT results.

• 한국생산제조학회지
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• 제7권4호
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• pp.14-20
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• 1998

This paper describes a computer-aided die design system of progressive die for making CPT grid. An approach to the development of the automatic design system is based on knowledge-based rules. The developed system is designed by considering several factors, such as grid geometry and punch profile. Grid, a key component of electronic gun, is formed through a sequence of many operations, among which the pilot piercing, beading, notching, bending, swaging and slotting etc. Using the developed system, design parameters are determined and output is generated in graphic forms. Therefore the developed system provides part drawing and the assembly drawing of die set.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.22-23
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• 2015

As wireless power transfer (WPT) technology using strongly coupled electromagnetic resonators is a recently explored technique to realize the large power delivery and storage without any cable or wire, this technique is required for diffusion of electric vehicles (EVs) since it makes possible a convenient charging system. Typically, since the normal conducting coils are used as a transmitting coil in the CPT system, there is limited to deliver the large power promptly in the contactless EV charging system. From this reason, we proposed the combination CPT technology with HTS transmitting antenna, In this study, we examined the improvement of transmission efficiency and properties for HTS and copper antennas, respectively, at 30 cm distance. Thus, we obtained improved transfer efficiency with HTS antenna over 10% compared with copper antenna