光州川의 水質管理에 의한 榮山江水質의 改善效果

朴成天,李相俊 東新大學校 工業技術硏究所 1997 工業技術硏究 Vol.3 No.-

This paper purpose of presenting the improvable effect of the Youngsan River water quality according to management of the Kwangju Chun water quality. QUAL2E model, the estimate model of the water quality is used in this paper. The river length of study-basin is 60.0km in middle channel of the Youngsan River. The river length is divided into 60 elements, and those are divided into 6 reaches. This paper focused on the improvement effect of the Youngsan River-water- quality, with water quality management degree of the Gwangju Chun and clean water inflow degree of the Youngsan River. As a result of estimate, the Youngsan River BOD concentration-regression equations that were based on BOD concentration of the Gwangju Chun and inflow clean water of the Youngsan River considerating the Gwangju Chun BOD concentration.

공증착으로 제작한 BSCCO 박막의 부착계수 특성

박용필 東新大學校 工業技術硏究所 2001 工業技術硏究 Vol.7 No.-

BSCCO thin films are fabricated via a co-deposition process by an ion beam sputtering with an ultra-low growth rate, and sticking coefficients of the respective elements are evaluated. The sticking coefficient of Bi element exhibits a characteristic temperature dependence : almost a constant value of 0.49 below 730 ℃ and decreases linearly with temperature over 730 ℃. This temperature dependence can be elucidated from the evaporation and sublimation rates of bismuth oxide, Bi₂O₃, from the film surface. It is considered that the liquid phase of the bismuth oxide plays an important role in the Bi 2212 phase formation in the co-deposition process.

Elastic Critical Load of Framed Columns Subjected to Different Axial Forces

Kim, Soon-Chul,Moon, Youn-Joon 東新大學校 工業技術硏究所 2004 工業技術硏究 Vol.10 No.-

The stability analysis of a single story-2 equal bay frame with different magnitudes of column axial forces is performed by the finite element method. The columns having the same cross sections are linearly tapered along their axes. The parameters considered in the analysis are taper parameter, a for the column and for the beam, beam span to column height ratio, β, and second moment of area ratio for beam to column, γ. To examine the axial force magnitude effect on the critical loads, the magnitude of interior column axial force is assumed to be n times that of the exterior column axial force. Column bases are either hinged or fixed, and frames are classified as being unbraced or braced. To extend the limit of numerical analysis results which are valid only for the particular discrete numerical values, the changes in the critical load coefficients for n=1.0 are represented by the algebraic function of analysis parameters. The decreases in elastic critical loads due to increases in load ratio n are approximately represented in terms of values corresponding to n=1.0.

강박스 거더교 콘크리트 바닥판에 발생하는 크리이프와 건조수축에 관한 연구

강성후,박선준,김현일 東新大學校 工業技術硏究所 2002 工業技術硏究 Vol.8 No.-

It studies the non-structural crack factors that are produced in Steel Box Girder Bridge concrete floor plate using analytical method. It mainly studies humidity and design standard of concrete strength. It used MIDAS CIVIL Ver 5.4.0, a general structure analysis program that applies drying shrinkage rate of domestic road bridge design standard and standard value of creep coefficient, CEF-FIP standard equation and ACI standard equation from the aspect of creep, drying shrinkage and hydration heat to see the effect of the two factors on concrete crack and found the following result. The analytical results of this study showed that the initial stress, which was obtained by ACI standard, exceeds the allowable tensile stress between 5 to 18 days. This result means that even if a bridge is designed and constructed according to design standard, the bridge can have cracks due to various variables such as drying shrinkage, hydration heat and creep that produce stress in slab.

노천 발파패턴에 따른 발파상수의 정량적 평가

강성후,박선준 東新大學校 工業技術硏究所 2002 工業技術硏究 Vol.8 No.-

The actual ground vibrations due to prism cut and trench cut blasting at power plant field have been measured, and the data were analyzed using reliability index(β) to the blast constants and attenuation coefficients. In this study, blast vibrations were suggested with wave component parts of ground vibration to the blast patterns, and were suggested with the division of ultimate limit state(,8 =0), serviceability limit state(β=1.28) and safety state(β =3) respectively. The reliability index 0 means 50% data line obtained by the least squares best-fit line. The reliability index 1.28 and 3 represent bounds below 90%, and 99.9% of the data, respectively. The vibration constants K(particle velocity) for prism cut were evaluated to 333, 619, 1419, respectively and the attenuation coefficients of vibrations was -1.94. From this study, inference and analysis methods of vibration equations using reliability theory were established.

통신기지국 접지시스템의 과도현상 해석에 관한 연구

김재이,윤태양 東新大學校 工業技術硏究所 2003 工業技術硏究 Vol.9 No.-

The grounding system design of the communication base station can be on the unfavorable conditions to induce the safe designing because of the limited area of the communication base station and the week point of surge caused by the given geographical condition such as the top point of mountain. In this thesis, it is examined throughly about the way of safe designing that can reduce GPR(Ground Potential Rise) within the normal frequency band. And it is also considered the effective counter plan to cope with a transient phenomena that happen when surge of scores MHz-band inserted.

벤토나이트 혼합토의 공학적 특성 연구

이진수,정광옥 東新大學校 工業技術硏究所 2002 工業技術硏究 Vol.8 No.-

Mixed soil that is able to resist water is used as liner material. mixed soil that uses bentonite as its blend material is widely used for Liner layer in reclaimed land of waste. It is recognized that the Liner and durability of the material are good. However, enhanced engineering method of using the bentonite is not efficient enough to be used in basic test for the design and specifications. It is still difficult to design and implement something with bentonite economically. So it is required to suggest the standard of bentonite mixture ratio after testing its physical and engineering characteristics to use the result in civil engineering. This study shows reliable basic data of water permeability, which was obtained from a test of mixing sand, granitic soil of weathered rock and bentonite with different pressing strength and permeation water, and strength characteristics with different water blend and blend ratio. It suggests adequate blend ratio and pressing strength that meets the standard of design and construction.

道市의 歷史的 文化環境 保存과 活用方案에 關한 硏究

李相俊,金在國 東新大學校 工業技術硏究所 1997 工業技術硏究 Vol.3 No.-

The conservation and application of historical environment is one of alternatives that are able to solve urban affairs. From this point of view, there is a necessity of research on these conservation and application. The conclusion of this study can be summarized as follows: 1. For the sake of conservation and application in historical environment, there are five steps(1. enlightenment ㆍ movement, 2. investigation ㆍ appraisal, 3. appointment ㆍ selection, 4. control ㆍ reformation, 5. application ㆍ management) 2. There are incentives of uniform control, special district control, performance control, TDR, PUD, MXD that are the programs of urban planning in historical environment. 3. The physical facilities of historical environment have to be make the use of parks, museum, art gallery, rest room etc. 4. There is necessity of residents-participation in conservation and application of historical environment.

시뮬레이션을 이용한 사출성형 조립라인의 흐름생산 시스템 구축

金萬洙 東新大學校 工業技術硏究所 1994 工業技術硏究 Vol.1 No.-

In this paper, using SLAM II simulation language a flow production system in assembly line of injection molding factory is simulated to test an actual situation. As a result, in constructing more efficient flow production system first of all the balance between worker/work station is demanded though one worker takes charge of multiple work/process and also cycle time and the number of assembly line is increased.

동적하중을 받는 콘크리트보의 파괴에너지 해석

姜聲厚,柳井善,孫官哲 東新大學校 工業技術硏究所 1994 工業技術硏究 Vol.1 No.-

In this study, after concrete cylinders were made on the condition of varying water-to-cement ratio, and cured 80 days compressive strength and splitting tensile strength were performed and modulus of elasticity is obtained. The fracture energy was obtained by acting three point bending on the 80cm in length. This test involved static loading test and dynamic loading test. In this work, the new interrelation of the material constants was obtained clearly and the property of the mixture was inspected, including the relation between the fracture energy and all kind of the material constants.