저온환경에서 타설되는 구조체 콘크리트의 등가재령 방법을 활용한 설계기준강도 확보기법

이영준 청주대학교 2020 국내석사

본 연구에서는 콘크리트의 배합강도 결정 시, 저온조건하 평균양생온도 저하에 따른 강도증진 지연에 대한 대응방안으로 보정값을 제안하고자 하였다. 이를 위해 실무에서 많이 사용하는 W/B 50 %의 일반강도 영역에서 OPC 콘크리트, FAC 콘크리트 2종, BSC 콘크리트 2종, 3성분계 시멘트 콘크리트에 대하여 등가재령 방법을 활용한 해석모델로 강도증진을 해석하고, 관리재령별 평균양생온도 저하에 따른 보정값 Tn를 제안하고자 하였다. 그 결과를 요약하면 다음과 같다. 1) 콘크리트의 종류별 민감도 계수를 도출하기 위해 ASTM C 1074에서 제시한 방법을 활용하여 반응속도상수와 겉보기활성화에너지를 도출하였고, 콘크리트 종류별 등가재령을 산정할 수 있었다. 2) 등가재령 방법을 활용한 log 함수모델과 분수함수 모델로 강도 증진을 해석한 결과 OPC, FAC, BSC, 3성분계 시멘트 콘크리트에서의 결정계수 R2 값이 분수함수 모델에서 높은 결과를 나타내었다. 따라서 log 함수모델보다 분수함수 모델로 강도증진을 해석하는 것이 보다 정확한 강도추정 결과를 나타낼 것으로 판단된다. 3) 등가재령을 활용하여 해석한 분수함수 모델로 재령 28일, 42일, 56일, 91일에서의 평균양생온도에 따른 압축강도를 추정하였고, 이때 재령 28일의 표준조건에서의 압축강도와의 차이를 보정하기 위한 단계별 기온보정강도 Tn을 3 MPa 단위로 제안하였다. 4) 단계별 기온보정강도는 OPC, FAC, 3성분계 콘크리트의 경우 재령 28일에서 0~17℃에서는 3 MPa, BSC 콘크리트는 10~17℃에서 3 MPa, 3~10℃에서 6 MPa, 0~3℃에서 9 MPa를 보정해야 하는 것으로 나타났다. 5) 관리재령 42일, 56일의 경우 3 MPa만 보정해야 하며, 91일에서는 강도보정이 필요 없는 것을 알 수 있었다. 이상을 종합하여 제안된 시멘트 종류별 평균양생온도에 따른 기온보정강도 Tn을 국가건설기준 통합코트의 배합설계 단계에 포함한다면 저온조건하 외기온에 대한 양생온도 저하에도 구조체 콘크리트의 설계기준강도를 확보할 수 있을 것으로 판단된다. In this study, when determining the design strength of concrete, a correction value was proposed as a countermeasure to the delayed strength enhancement due to the reduction of the average curing temperature under cold conditions. For this purpose, the strength enhancement was interpreted as an analytical model using equivalent age method for ordinary portland cement(OPC) concrete, fly ash cement(FAC) concrete type 2, blast furnace slag cement(BSC) concrete type 2, and ternary blended concrete in the normal strength area of 50 % of W/B, which is commonly used in practice, and the value of Tn was proposed according to the mean curing temperature of each management age. In summary, the results are as follows. (1) To derive the sensitivity factor by type of concrete, the methods presented in ASTM C 1074 were used to derive the reactive velocity and apparent activation energy, and equivalent age by type of concrete could be calculated. (2) The analysis of strength enhancement with log function model and fraction function model using equivalent age method showed that the determination factor R2 value in OPC, FAC, BSC, and three-component cement concrete had high results in the fraction function model. Therefore, it is judged that the analysis of strength enhancement with the fraction function model rather than the log function model will result in a more accurate estimation of strength. (3) The compressive strength according to the mean curing temperature at 28 days, 42 days, 56 days, and 91 days was estimated by the model of the fractional function analyzed using equivalent age, and the step-by-step temperature correction strength Tn was proposed in 3 MPa to compensate for the difference from the compressive strength under the standard conditions of 28 days of age. (4) The temperature correction strength for each step was found to be 3 MPa for OPC, FAC, and ternary concrete at 0~17°C from 28 days of age, 3 MPa for BSC concrete at 10~17°C, 6 MPa for 3~10°C, and 9 MPa at 0~3°C. (5) Only 3 MPa should be calibrated for the management age of 42 days and 56 days, and 91 days showed that strength calibration is not required. Hence, If the strength correction factors with temperature level Tn are included in the mix design of Korea Construction Standards Center depending on the average curing temperature of each type of cement presented, it is deemed that the design standard strength of structural concrete can be secured even if the curing temperature decreases.

地域 平生敎育 活性化를 위한 네트워크 構築 方案

이영준 전주대학교 2001 국내석사

Small municipalities and communities lack adequate legal or regulatory foundations to build and utilize networks. They have rudimentary ideas of lifelong education, however are in needs of research to build networks for lifelong education. This research looks at the ways to build the networks that will promote local lifelong education. Towards this end, it will address the following objectives. Firstly, it will study the academic principles on networks for lifelong education. Secondly, it will look into the network systems in nations, municipalities and provinces. Thirdly, it suggests how the lifelong network can be built in municipalities and gun regions. The research went through the following steps for above objectives. Firstly, the research involved outlining the concept of networks for lifelong education through gathering information on network architecture, procedure and the history of development. The sources of information were documentations on components of networks, public reading and hearing transcripts, conference materials, books, almanac of lifelong education and encyclopedia. Secondly, the research reconfigures network systems to service the objective and functions of organizations for the state-supported and regional lifelong education centers. Thirdly, building regional networks will be based on the case of co-ops for Women's social educational institutions and organization in the city of Namwon. This research came to the following conclusions, Firstly, the national or regional lifelong education networks must be built with consideration for the exchanges, sharing, Integration and multi-dimensional use of human and other resources. Secondly, the networks for lifelong education should be built to maximize the national system of and to ensure the rights to learn (Article 3 of the basic educational law) and the principle of lifelong education (Article 4 of the lifelong education law) are implemented. The network systems should be consolidated and restructured with the emphasis on lifelong educational institutions. Thirdly, to establish the nation-wide lifelong education system, financial and regulatory assistance should be in place and implemented via the lifelong educational facilities. The financial and regulatory aids should m(let the particular needs of a region.

3차원 발사체 형상 공력 해석을 위한 비정렬 격자와 다면체 격자의 비교연구

이영준 忠南大學校 大學院 2017 국내석사

The surface of a launch vehicle is not as smooth as normal aircraft. This is because of external fixtures such as stringers and nozzles etc. To analyze aerodynamic characteristics of a launch vehicle, it is necessary to generate billions of meshes to calculate properly and this requires extremely high performance computers. In this study a Computational Fluid Dynamic approach on Saturn V launch vehicle was accomplished. To reduce calculation time while keeping the validity of calculated data, several different types of grids were tried such as unstructured tetrahedral mesh, hybrid mesh and polyhedral mesh. Flow calculation was performed by using flow conditions which were based on Apollo 11 launch trajectory. According to the calculation results and relevant analysis, using polyhedral converted grids could save total amount of mesh while maintaining accuracy of calculation in terms of aerodynamic characteristics, especially drag coefficients. It could be concluded that polyhedral mesh could be a good solution for efficient calculation on complex geometry models, however it should also be noted that excessive reduction of volume mesh can cause deterioration of convergence of flow calculation process. 발사체 형상의 경우 일반 항공기와는 다르게 표면이 매끄럽지 못한 부분이 있다. 이는 스트링거와 노즐등의 외부 부착물이 있기 때문이다. 이러한 발사체에 대하여 원활한 공력 해석을 수행하기 위해서는 많은 수의 격자와 고성능 컴퓨터가 필요하다. 본 연구에서는 Saturn V 발사체의 공력 특성에 대해 전산유체역학적인 접근을 수행하였다. 계산 시간을 감소하며 동시에 동일한 신뢰도를 유지하기 위해 비정렬 사면체 격자와 hybrid 격자 등 여러 형태의 격자를 생성하였다. 유동 조건은 Apollo 11호의 발사 궤적에 따라 적용하였다. 다면체 격자 변환을 통하여 전체 격자의 수를 감소시키며 결과물의 신뢰도를 유지할 수 있었다. 복잡한 형상에 대한 공력 해석 시 다면체 격자는 유용하게 사용될 수 있으나 지나치게 격자가 많이 줄어드는 경우 수렴된 결과를 얻기 어려워지는 것을 확인하였다.

무혈청 규정 배지를 이용한 자궁경부암 세포주 배양에 관한 연구

이영준 서울대학교 대학원 1989 국내석사

Collagenase 및 Chondroitinase에 의해 변성된 관절연골의 Quantitative 및 Gd(DTPA)2- -enhanced MRI 소견에 대한 연구

이영준 부산대학교 일반대학원 2000 국내박사

3D 물류로봇 관리시스템 구현에 관한 연구

이영준 공주대학교 테크노융합대학원 2020 국내석사

ABSTRACT A Study on the Implementation of 3D Logistics Robot Control Management System Young Jun Lee Department of IT Convergence Graduate School of Kong Ju National University Gong Ju, Korea (Supervised by Professor Koo-Rack Park) Logistics robots are a robot for logistics automation and have a long history. With the recent start of the Fourth Industrial Revolution, they are attracting attention as the main means of expanding the base of smart factories and automating logistics. Medium and low-priced logistics robots, which are mainly used in actual logistics sites, are mostly used to reciprocate along a magnet line or rotate a magnet path in a circular closed loop. This model is applied by benchmarking Toyota system in Japan, and it is not applicable to other parts except the light parts of assembly line. It is very expensive, so it is difficult to apply to the logistics management system of small and medium companies except large companies. Since autonomous logistics robots are equipped with complicated mechanical structures and electronic equipment, software for logistics robots that operate them becomes difficult, and the system for managing them is also sophisticated, and the whole The logistics robot management system is increasingly complicated. However, the logistics robot management system up to now requires a model capable of interworking with the MES and the logistics automation system through the 3D type with most of the 2D type management. In this paper, I have developed a logistics robot management system with such a planar 2D shape monitoring system in one step so that anyone can easily and quickly grasp the situation at the site of the logistics robot. A management system that can easily and accurately control the operation of logistics robots in Japan will provide a 3D animation mobile logistics robot system that is almost the same as the situation on site. Small and medium-sized manufacturers that have insufficient investment capacity through the proposed system are expected to be able to operate even without the introduction of low-priced logistics robots with a simple structure and specialized personnel. As the research in this paper aims, each industrial group will have a synergistic effect on the fusion research by engineering field, and the future research that combines mechanical, electrical, electronic, and software must continue.

Girder 구배에 따른 사장교 형태별 역학적 거동에 관한 연구

이영준 경남대학교 대학원 2005 국내석사

장대교량인 사장교는 콘크리트 교량에 비하여 경량이면서 높은 내하력이 요구되어지므로 최근들어 절대적인 우위를 차지하고 있는 지배적인 교량구조물 형식이다. 현재 국내의 경우 장대교량이 전체 건설된 교량에 비해 매우 낮은 수준에 불과하지만, 세계 여러 곳에서 장대교의 사용이 많이 이루어지고 있으며 또한 건설되어 지고 있는 중이다. 세계의 이러한 현상 등을 비추어 국내에서도 장대교의 설계, 제작 및 시공기술의 발전에 따라 일반 강재교량과 더불어 장경간 사장교의 가설이 급증할 것으로 예상된다. 사장교의 해석에서는 케이블의 초기강성을 확보하기 위하여 케이블에 초기응력 도입이 필수적이며, 초기응력 도입으로 발생하는 대변형 현상 및 다른 부재에 미치는 영향을 파악하는 것은 사장교를 설계할 때 구조계를 계획하는데 매우 중요한 과정이다. 그러므로, 주형의 구배에 따른 케이블의 초기긴장력의 변화를 검토함과 동시에 주탑 및 주형에 미치는 영향을 분석해보았다. 그 결과 Harp형 사장교에 있어 구배에 따른 초기긴장력은 경간의 외측 케이블의 초기긴장력의 변화폭과 유사한 폭으로 주탑의 좌우측 케이블에서 나타났으며, Fan형 및 방사형 사장교에 비해 구배의 영향이 가장 큰 것으로 나타났다. 그리고 방사형 사장교는 구배의 영향이 가장 적게 나타났다. 주형의 구배변화에 따른 케이블의 긴장력 분포와 주형, 주탑의 단면력에 있어 가장 유리한 사장교의 형태는 방사형으로 나타났다. 이는 아치형의 사장교를 설계할 경우 방사형이 가장 유리한 구조임을 입증하고 있다. Cable stayed bridge is light weight than concrete bridge, and bridge structure form that is used recently because high load carrying capacity is required. In the case of present domestic, long span bridge's use is attained much and also is built in world several places although long span bridge is not more in level that is very low than whole built bridge. In these trend, usability of long span cable stayed bridge with general steel materials bridge according to development of long span bridge's design and a construction technology is expected that enlarge in domestic. For analysis of cable bridge acquires initial stiffness of cable, cable initial force's analysis is essential. Also, it is very important process when design cable stayed bridge to analyze effect getting to big distortion and other elements that occur because wear initial stress garments. Therefore, analyzed effect that compare cable initial force's change by deck slop, and also gets to main tower and deck. As a result, harp type cable stayed bridge displayed difference that cable initial force by slope is big, and slope's effect appeared by the biggest thing than fan type and radial type. And radial type cable stayed bridge appeared as slope's effect is the smallest. Cable initial force's distribution and deck and form of cable stayed bridge that is the most profitable to section force of main tower by deck's slope appeared by radial type. This is proving that radial type is the most profitable in case of design arched cable stayed bridge.

磁場이 인가된 내장형 線型 誘導結合 플라즈마를 利用한 대면적 프라즈마 소스에 關한 硏究

이영준 成均館大學校 大學院 2003 국내박사

In semiconductor device and liquid crystal display (LCD) manufacturing, processes using plasma are widely employed. In recent years, in order to improve production efficiency, large-diameter wafer substrates and large-area glass substrates have been adopted. Especially, high-density and large-area plasma processing technologies are indispensable for high resolution flat panel display (FPD) devices, especially for TFT-LCD of next generation. Therefore, the trend towards large-area substrates stressed by the semiconductor and flat panel display (FPD) industries is propelling the large-area plasma source developments. In this work, to investigate the possibility in the application of the internal linear inductive antenna sources for the large area FPD process applications, a large-area (1020mm×830mm) internal linear-type inductively coupled plasma (ICP) source has been developed and the plasma characteristics were studied. Further, the basic etch characteristics such as etch rates and etch uniformity on the photoresist film and the SiO_(2) film were also studied. The process chamber was designed as a rectangular mainly for the FPD application and was made of stainless steel. The inner size of the chamber was 1020mm×830mm. Straight antennas were embedded in the vacuum chamber and each linear antenna was connected in series as a serpentine type at the outside of the vacuum chamber. The distance between the neighboring antennas were varied from 8㎝ (the corresponding total length of the antenna was 13.48m) to 16㎝ (the corresponding total length of the antenna was 7m). Even though the plasmas generated at the pressure higher than 15mTorr showed uniform and stable plasmas, those generated below 5mTorr showed unstable plasmas, therefore, the operation at higher rf powers more than 1000Watts were impossible. In the unstable range of operational pressure, arcing between the plasma and chamber wall was observed possibly due to the increased electron loss to the wall and the increase of plasma potentials to compensate the loss of electrons at low pressures. Magnetic fields were applied in the internal ICP system using a linear antenna coil. Novel arrangements of the multipolar magnetic fields were designed by inserting the permanent magnets having 3000G on the magnet surface in the separate quartz tubing located parallel to the linear current carrying antennas. In a large area internal-type linear-antenna ICP system (1020mm×830mm) the capacitive coupling between the antenna and the plasma could be effectively reduced by the application of a novel magnetic field. Also, higher plasma densities up to 10^(11)㎝^(-3) were observed with the magnetic field. The increase of ion density with the magnetic field is believed from the decreased diffusional loss of the charged particles to the chamber wall and also from the effective ionization of high energy electrons by E×B field near the antenna where E field is formed parallel to the antenna and the B field is formed across the antenna by the magnets. The application of the magnetic field also increased the stability of the plasma while maintaining the plasma uniformity less than 9% in the substrate size of 820mm×630mm. Therefore, in our case, by arranging the novel arrangements of multipolar magnets near and parallel to the antenna instead of conventional magnet arrangement where alternate magnets cover all around the chamber wall, an effective increase of plasma density and plasma stability could be obtained. With the increase of the processing area, the length of the driving coil becomes comparable to the rf wavelength, and standing wave effects that cause a nonuniform power distribution along the driving coil to become intolerable. Especially, in the case of serpentine type antenna, due to the long length of the its length close to operating rf wavelength(l3.56MHz) and its high impedance, it is difficult to remove the standing wave effect and the plasma unstability as the chamber size becomes larger and larger. Therefore, in this study, a novel arrangement of large-area internal-type antenna (double comb-type antenna) ICP source which does not have the standing wave effect and a high impedance was conducted for the first time. Five parallel antennas were embedded in the vacuum chamber and each antenna was connected to the rf power supply alternatively from the opposite ends. The other ends of the each antenna were connected to the ground, therefore, a double comb-type internal antenna was formed. Using the double comb-type internal antenna, inductively coupled plasmas were generated and their effects on the plasma density and uniformity were investigated for 15mTorr Ar. When the rf power was higher than 2000W, the plasma density was higher than 1x10^(11)/㎤ and, when the applied rf power was 5000W, the plasma density was close to 2.2x10^(11)/㎤, Therefore, it is believed that high density plasmas could be obtained using the double comb-type internal ICP source used in the experiment. The plasma uniformity improved with the increase of rf power from about 14% at 600W to about 8% at 5000W possibly due to the increase of inductive coupling instead of capacitive coupling of each antenna. Using the double comb-type antenna, the etch rates of SiO_(2) and PR were increased with the increase of inductive power almost linearly and, at 5000W of inductive power, PR etch rate was reached to 3700Å/min and SiO_(2) etch rate was reached to 1700Å/min. Therefore, PR etch rate was higher than SiO_(2) etch rate possibly due to the chemical reaction of PR with abundant fluorine atoms in the SF_(6) plasma. By increasing the working pressure up to 50mTorr, the SiO_(2) etch rate was increased to 2800Å/min. The etch selectivities of SiO_(2) over PR, however, were lower than 0.4 in general for SF_(6) plasma possibly due to the abundant fluorine atoms in the SF_(6) plasma. The etch uniformity of PR etch rate obtained using O_(2) plasma was about 2% and that of SiO_(2) etch rate was about 6%. The inductive power was 4000W for PR and 5000W for SiO_(2) , dc-bias voltage was -350V, and the working pressure was 25mTorr. Comparing with the results of plasma uniformity, the etch uniformities of SiO_(2) and PR were better than the plasma uniformity. Therefore, using the double-comb type internal antenna, SiO_(2) etch rates higher than 2000Å/min could be obtained with the etch uniformity close to 6%.

大柴胡合五영散이 高血壓 白鼠 및 高 Cholesterol 食餌 白鼠에 미치는 影響

이영준 東義大學校 2000 국내박사

Abstract : (An)experimental study on the effects of Daesihotanghaporyoungsan on hypertension and hyperlipidemia

요추신경근 압박의 평가에 있어서 기능적 척추강조영술로써 양측굴위촬영의 의의

이영준 부산대학교 1993 국내석사