Garcin 증후군으로 발현된 연골육종 1예

강성수,김명권,박현미,류근신,신동진 대한신경과학회 1999 대한신경과학회지 Vol.17 No.2

철근 콘크리트 H.P 셀의 해석

성재표,강호근,박성수 釜山大學校生産技術硏究所 1995 生産技術硏究所論文集 Vol.49 No.-

본 연구는 철근 콘크리트 H.P. 쉘의 3차원 재료적 비선형 해석을 하기 위한 것이다. 콘크리트 요소는 3축 비선형 응력-변형률 거동, 균열, 파쇄 및 변형률 완화를 포함하는 3차원 16절점 고체 요소를 사용하고, 철근은 3절점 탄소성 트러스 요소를 사용한다. 거동 해석으로는 균열후 골재의 맞물림을 고려하는 유효 전단 계수를 도입하였으며, 수치 해를 얻기 위해 증분법을 사용하였다. 수치 예제로서 Lin의 철근 콘크리트 H.P. 쉘을 채택하여, 본 해석 결과와 비교하였다. This study presents the three-dimensional material nonlinear analysis of reinforced concrete H.P. shell. A concrete is idealized with three-dimensional 16-node solid element including triaxial nonlinear stress-strain behavior, cracking, crushing and strain softening; a steel with three-dimensional 3-node truss element including elastic-plastic behavior with strain hardening. The effective shear modules considering aggregate interlock after cracking and an incremental method is used to obtain a numerical solution. Numerical examples of Lin's reinforced concrete H.P. shell is selected to compare with the numerical results.

Effect of Inhomogeneous Nucleation of Hydride at α/β Phase Boundary on Microstructure Evolution of Zr–2.5 wt%Nb Pressure Tube

Sung‑Soo Kim,Sangyeob Lim,Dong‑Hyun Ahn,Gyeong‑Geun Lee,Kunok Chang 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4

We analyzed the microstructural characteristics such as number density and length and width of hydrides in Zr–2.5 wt%Nbpressure tube. The hydrogen was charged cathodically and the hydride-contained sample was evaluated using the advancedanalysis methodologies. We performed a diff erential scanning calorimetry analysis to more quantitatively understand thethermodynamics of the hydride formation/growth process. We characterized the micrograph of hydride-contained Zr samplesto estimate the microstructural characteristics of the matrix and hydrides. We investigated eff ects of hydrogen concentrationand microstructure of matrix on determining microstructural measures of the hydrides. Particularly, we found that β phasein the matrix becomes isolated during the heat treatment same or above 475 °C and this change increases the inhomogeneousnucleation sites signifi cantly. We claim that the microstructure change of this matrix phase greatly increases the numberdensity of hydride.

고추 乾燥機 開發을 위한 고추의 適正 乾燥方法에 관한 基礎 硏究

成始興,吳聖根 建國大學校 自然科學硏究所 1994 建國自然科學硏究誌 Vol.5 No.1

Drying method, the characteristics of dryer, which are currently used to dry a red pepper, were surveyed and analyzed to design and analyze an economical red dryer. Based on the results of this research the following conclusions were made: Drying by red pepper dryer was the most popular drying method(49.0%) surveyed from the farmhouse distribution according to drying method. After primary drying, secondary drying was widely performed. The larger area was cultivated the red pepper by farmer, the more dryer was used to dry it. Besides the smaller area was, the more warehouse drying was. From drying temperature according to the drying periods, the lower initial input temperature was, the lower initial temperature was. While the initial input temperature was passing to the final drying, initial temperature was inclined to be higher. The drying time and temperature were not constant. The number of mean drying day according to the drying methods were 13.8, 3.7∼5, and 1.7 for natural drying, house drying, warehouse drying, and dryer respectively. The dryer should spread far and wide in future, because red pepper drying was difficult in bad weather for drying red pepper. An economical red pepper dryer should be developed as soon as possible.

高溫疲勞에서 싸이클依存型 및 時間依存型 疲勞크랙傳播의 遷移 : 싸인應力波 및 사디리꼴應力波에 대하여

成洛元,周原植,韓根祚 東亞大學校 大學院 1984 大學院論文集 Vol.8 No.2

A study on the nonlinear fracture mechanics was made on the low-cycle fatigue crack growth in SUS304 stainless steel under trapezoidal and sine stress wave at 650℃. The high temperature low cycle fatique crack growth behavior was classified into two categories: cycle-dependent and time dependent. The cycle-dependent crack growth rate correlated well with J integral range ?J, whereas the time dependent crack growth rate was characterized by modified J integral Jex. A parameter βwas found useful in predicting the transition from the cycle-dependent crack growth to the time-dependent crack growth. Conducting the experiment of high temperature fatigue crack propagation in trapezoidal, and sine stress wave, following conclusions were obtained. 1. Crack propagation behavior can be classified into cycle-dependent and time-dependent. 2. The transition of cycle-dependent crack propagation to time dependent one could be predicted bt either parameter βor ?J/ ?J?.

경남 고성군 덕명리 상족암지역의 야외지질학습자료 개발 및 활용에 관한 연구

서석근,윤성효 부산대학교 사범대학 과학교육연구소 2001 科學敎育硏究報 Vol.28 No.-

In the recent years, the importance of experience learning has been emphasized in the science education. Because of this situation, the science education that was mainly taught in the class has been changed into the field work. Therefore, the related teachers have recognized the systematic necessities of teaching materials that will be focused on the teaching places and activities. This study seeks to develop the study materials for the field geologic practice in the Snagjok-am, Deokmyeong-ri, Goseong-gun, Gyeonsangname-do, and to find the teaching methods for the geologic units of the earth science at the middle school. There are wide outcrop of sedimentary rocks which eroded by the sea waves in this place. And we have easily access to that place, so the field observation can be carried out successfully. Also there are various rocks, geologic structures, and fossils which are the importance materials for the science curriculum at the middle school. The practice course is divided into from A to E courses, and the related materials are made for the purpose of investigating those whole sites within one or two days. Each course can be explained as the followings. (1) Course A: participants can study from three stops the joint system of igneous rocks, the bedding layer of the sedimentary rocks, and the various characteristics of the shore sediments. (2) Course B: participants can investigate from three stops the structure of the sedimentary rocks, that is cross bedding, sun cracks and fossils. (3) Course C: participants can survey from two stops the various rock facies and geologic structure caused from the intrusion of igneous rocks. (4) Course D: in this course, students can observe the various aspects spontaneously because the previously stated geologic structures are repeatedly appeared. (5) Course E: participants can study the wave0cut bench, cliffs, and caves caused by the erosion of sea waves. This thesis seeks to develop the geologic informations, learning content, instructive and teaching methods, background knowledge, and the materials of field studies which students can effectively used. The content of field studies have focus on the geologic unit at the middle school science textbook, but this can be varied flexibly according to the related levels. Additionally, this study has been proven practically through the real experiments conducted by the first class student of the middle school. The conclusion is that the field programs have had the affirmative result in improving the scientific attitudes, and the cognition about field works has been appraised positively.

플라즈마 표지소자의 제작

이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-

An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.

한국 경호환경의 동향과 전망에 대한 분석

이상철,유송근,박준석,김병주 龍仁大學校 1998 용인대학교 논문집 Vol.15 No.-

It is neccesary to facilitate the developments of the systems, principles and instructions of guarding in order that the security guard be able to meet the needs of the environments of guarding regardless what kind of government system our country may be. The guard also need the nationality and brilliant brains rather than the political power so that the guarded be safe always and everywhere and all people in the country feel peaceful and safe, which requires it that every bodyguard investigate and develope the new technology of guarding through reasonable and scientific methods. And I think followings are necessary for the development and advance of future the Security guard : the strong relations with the related organizations, the education facilities for supporting good and strong bodyguards, the related information bureau with mood image against the internation terror croups, and professionalization for better adaption in the idustralized various society, and the department for study on the principles of guarding. In addition to those, it would be important to be equipped with enough amarments and strong wills. Anyway, the next 21th century requires big change of the everyone's opinions on guarding and it would not be impossible to provide complete guard with only the system of guard itself, so it needs everyone's help. Of course will it require the professionals of Information technology too, in the future information society. I suggest that it need to combine various functions and specialize each fuction of the security guard at the same time. Then it would be more easy to maintain the system to prevent the future dangers, so to acomplish the complete guarding system. As a conclusion, it would be possible to meet the 21th environment of guarding only with the scientific, reasonable and specialized guard system.

PIV계측에 의한 충돌제트에서 사각 난류촉진체 주변의 유동특성 연구

李相範,孫承佑,宋旼根,朱恩選 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-

The objective of this study is to investigate characteristics of flow by the square turbulence promoter and the selection of a proper impinging distance. The promoter was set up vertically to the way of a nozzle exit flow, each pitch fixed to be 30㎜ and the measurement region divided by 4 section(A, B, C, D). The characteristics of flow field were investigated in each case of the distance rate from the nozzle exit to impinging plate(H/B=4, 6, 8, 10) changing nozzle exit diameter(Ψ10, 17, 23) and Re=4,000. As the experimental result by using PIV measurement at Ψ17 and H/B=6 in the free jet, the turbulence intensity showed a big strength at A section, a decreasing of 20.1% at B section, an increasing of 10% at C section and an increasing of 10.9% at D section. On the other side, when the square turbulent promoter set up, The flow showed a tendency with the free jet at A section, a decreasing of 16.2% at B section, a decreasing of 1.5% at C section and an increasing of 8.3% at D section, It has been shown that for enhancing the turbulence intensity are the case of Ψ17 and H/B=8 in the B section is the propel condition.

重油灰로부터 바나듐의 分離 回收에 관한 硏究

李成植,姜奉根,李銀珠 동아대학교 환경문제연구소 1993 硏究報告 Vol.16 No.2

The separation and the purification of the vanadium from petroleum fly ash have been investigated. The experiments were carried out in leaching with the water, hydrochloric and sulfuric acid, adsorption with commercial selective resin for metals and extraction with commercial extractants. From the results, they were obtained the following conclusions. 1. The metals contained in the fly ash could be well leached with the water, hydrochloric and sulfuric acid. But first of all hydrochloric acid was the best leachant for separation of vanadium. 2. Adsorption capacity of vanadium was the following order, MC-75>SK-1B>CR-10>WK-10 and vanadium was concentrated to fifteen times enrichment per one gram using MC-75 in fixed bed adsorption and desorption. 3. As the purification of vanadium by extraction method, the extraction equilibrium distribution ration was increased with increasing the concentration of hydrochloric acid and the order was TOMAC>TBP>TOPO. At the range of pH 0∼3, the order was TOMAC>DP-8R>LIX51. 4. It was proposed the synthetic process for recovery of vanadium from petroleum fly ash.