• Title/Summary/Keyword: TEP

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A Simplified Method to Predict the Weld-induced Deformation of Curved Plates (곡판의 용접변형 예측을 위한 간이 해석법)

  • Lee, Joo-Sung;Hoi, Nguyen Tan
    • Journal of the Society of Naval Architects of Korea
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    • v.44 no.5
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    • pp.474-481
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    • 2007
  • A three-dimensional finite element model has been used to simulate the bead on plate welding of curved steel plates having curvature in the welding direction. By using traditional method such as thermal-elastic-plastic(TEP) finite element analysis. the weld-induced deformation can be accurately predicted. However, three-dimensional finite element analysis is not practical in analyzing the weld-induced deformation of large and complex structures such as ship structures in view of computing time and cost. In this study, used is the equivalent loading method based on inherent strain to illustrate the effect of the longitudinal curvature upon the weld-induced deformation of curved plates.

A Case study of the requirement verification model development for High Speed Railway Systems (고속철도시스템 요구사항 검증 모델 개발 사례)

  • Jeong, Jae-Deok;Lee, Jae-Cheon;Kim, Chan-Muk;Yun, Jae-Han;Wang, Jong-Bae;Choe, Yo-Cheol
    • 시스템엔지니어링워크숍
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    • s.6
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    • pp.126-129
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    • 2005
  • Systems engineering requirement verification model developmetn for High Speed Railway systems in progress is a national large system development program that is not only large-size and complex but also multi-disciplinary in nature. For the High Speed Railway TEP development, verification requirements that could verify system function, performance, and constraint, should be derived from SSS(system Segment specification). Hereafter, this could be referred to as verification requirements. System engineering process establishes traceability between verification requirements and system requirements. These tasks could be accomplished by the schema. using computer-aided Systems Engineering tool(CORE), High Speed Railway program can become a database and other system related to High Speed Railway program will be developed effectively and efficiently.

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The Application of Metallic Thin Film for Tep Electrode of Poly-Si Solar Cell (다결정 실리콘 태양전지의 상부 전극용 금속 박막 적용)

  • 김상수;임동건;심경석;이준신;김흥우
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1997.11a
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    • pp.202-205
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    • 1997
  • We investigated grain boundary effect for terrestrial applications of solar cell\ulcorner with low cost, large area, and high efficiency. Grain boundaries are known as potential barriers and recombination centers for the photo-generated charge carriers, which make it difficult to achieve a high efficiency cell. To reduce these effects of grain boundaries, we investigated various influencing factors such as thermal treatments, various grid patterns, selective wet etchings for grain boundaries, buried contact metallizations along grain boundaries, and use of metallic thin films. From the various grid patterns we learned that the series resistance of solar cell reduced open circuit voltage and consequently decreased the cell efficiency. This paper describes the effect of various grid patterns and the employment of metallic thin films for a top electrode.

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SE Model-Based Test & Evaluation System - Application Case for Smart UAV (SE 모델기반 시험평가 체계 - 스마트 무인기 적용사례)

  • Oh, Soo Hun;Kim, Yuen Tae;Lee, Joong Yoon
    • Journal of the Korean Society of Systems Engineering
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    • v.3 no.1
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    • pp.1-7
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    • 2007
  • For the systems engineering process-based development, all requirements of 'Smart UAV Development Program' have been constructed as the database of CORE(R), computer aided systems engineering tool. In this paper, the construction and application of model-based test & evaluation system using those database is described, which prevents omitting essential tests and performing unnecessary rests and enables automatic reflection of database changes and standardization of document formats.

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Detectio of Malonaldehyde-thiobarbituric Acid (MA-TBA) Complex by High Performance Liquid Chromatography(HPLC) in a Model System

  • Whang, Key
    • Preventive Nutrition and Food Science
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    • v.4 no.3
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    • pp.167-170
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    • 1999
  • Various concentrations of malonaldehyde (MA) produced upon hydrolysis of 1, 1, 3,3-tetraethoxypropane (TEP) were reacted with 2-thiobarbituric acid (TBA)and th e contents of MA-TBA complex were measured both with spectrophotometer and high performance liquid chromatography (HPLC). As the concentrations of MA-TBA increased, their absorbances and the corresponding HPLC peak areas increased. The correlation coefficient between absorbances and HPLC peak areas of MA-TBA peaks from the other compounds and butanol extraction of the complex increased its recovery its recovery by 29.4% . Measurement of the content of MA-TBA complex for monitoring the development of lipid oxidation was proven to be successful with the use of high performance liquid chromatography.

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Cell Cycle Arrest by Treatment of D-Ala2-Leu5-enkephalin in Human Leukemia Cancer U937 Cell. (인체혈구암세포 U937의 D-Ala2-Leu5-enkephalin처리에 의한 세포 주기 억제 효과)

  • Lee, Jun-Hyuk;Choi, Woo-Young;Choi, Yung-Hyun;Choi, Byung-Tae
    • Journal of Life Science
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    • v.19 no.5
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    • pp.620-624
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    • 2009
  • D-Ala2-Leu5-enkephalin (DADLE), a hibernation inducer, can induce hibernation-like state in vivo and in vitro. We treated U937 human leukemia cancer cells with DADLE and investigated its possible effect on transcription and proliferation. Treatment of U937 cells with DADLE resulted in growth inhibition and induction of apoptotic cell death on high-dose as measured by MTT assay and DNA flow cytometer analysis. Bcl-XL, c-IAP-2 and survivin genes especially showed decreases in mRNA levels. DADLE treatment also inhibited the levels of cyclooxygenase (COX)-2 mRNA without alteration of COX-1 expression. DNA flow cytometer analysis revealed that DADLE caused arrest of the cell cycle on low-dose, which was associated with a down-regulation of cyclin E at the transcriptional level. DADLE treatment induced a marked down-regulation of cyclin-dependent kinase (Cdk)-2, -4 and -6. In addition, treatment with DADLE decreased telomere associated genes such as, c-myc and TERT, and increased TEP-1 in U937 cells. These results suggest that DADLE can be an inhibition agent in the cell cycle of the human leukemia cancer U937 cell.

Flame Retardant Property of PU by the Addition of Phosphorous Containing Polyurethane Oligomers (폴리우레탄을 인계화합물로 해중합한 올리고머의 난연성)

  • Jung, Sunyoung;Kang, Sungku;Cho, Ilsung;Koh, Sungho;Kim, Younhee;Chung, Yeongjin;Kim, Sangbum
    • Applied Chemistry for Engineering
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    • v.18 no.4
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    • pp.376-380
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    • 2007
  • Used polyurethane (PU) was chemically degraded by the treatment with flame retardants such as tris(1,3-chloro-2-propyl) phosphate (TCPP), triethyl phosphate (TEP), and trimethyl phosphate (TMP). Analysis of FT-IR and P-NMR showed that the degraded products (DEP) contained oligourethanes. Rigid polyurethane foam was produced using the DEP as flame retardants. The flammability and thermal stability of recycled rigid polyurethane were investigated. The mechanical properties such as compressive strength of recycled polyurethane were also studied. The recycled polyurethane reduced flammability and enhanced thermal stability over intrinsic polyurethane. Mechanical strength of recycled polyurethane also shows as high as that of intrinsic polyurethane. In order to evaluate flame retardant properties of the recycled polyurethane foams with various amounts of DEP, heat release rate (HRR) of the foam was measured by cone calorimeter. Scanning electron micrograph of recycled PU showed a uniform cell morphology as a intrinsic PU.

Clinical Experience with Hirschsprung's Disease (Hirschsprung씨 병의 임상적 경험)

  • Park, Keun-Myoung;Choe, Yun-Mee;Kim, Jang-Young;Choi, Sun-Keun;Heo, Yoon-Seok;Lee, Keon-Young;Kim, Sei-Joong;Cho, Young-Up;Ahn, Seung-Ik;Hong, Kee-Chun;Shin, Seok-Hwan;Kim, Kyung-Rae;Seo, Jeong-Meen
    • Advances in pediatric surgery
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    • v.16 no.2
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    • pp.162-169
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    • 2010
  • The aim of this study is to review our clinical experience with patients with Hirschsprung's disease (HD) Medical records of 39 children who underwent definitive surgery for HD at Inha University Hospital from September 1996 to June 2008 were analyzed by age at presentation, sex, gestational age, birth weight, clinical presentation, diagnostic tools, level of aganglionosis, surgical procedures, postoperative complications, and postoperative bowel function. Twenty-five patients (64.1 %) were males and 14 (35.9 %) were females. Thirty patients (76.9 %) were diagnosed and treated in the neonatal period. The transitional zone was at the rectosigmoid region in 89.7 %. Twenty-seven patients (69 %) were treated by preliminary colostomy or ileostomy. Twenty-four patients had the Duhamel operation, 6 patients anorectal myectomy, and 9 patients had transanal endorectal pull-through (TEP). Five of 9 patients who had the TEP procedure did laparoscopic assistance. Postoperatively, seventeen patients (83 %) passed stool once or more times per day and 3 patients had stool soiling. This study demonstrated that the majority of the patients had good results. To determine which treatment is most effective comparative review by operation method would be required.

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Studies on the improvement of the productivity of purse seine fishery-III - The characteristics on the motion with the flow velocity of model purse seine of the subjective power block and triplex during pursing - (선망어업의 생산성 향상에 관한 연구-III - 죔줄 체결시 파워불록과 트리플랙스용 선망 모형의 유속에 따른 운동특성 -)

  • Kim, Suk-Jong
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.43 no.1
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    • pp.12-27
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    • 2007
  • This fundamental studies on for the productivity improvement and laborsaving of purse seine fishery. Given the difficulty posed from the distortion of net shape caused by the external forces, such as tide, at the time of shooting and pursing, we set the 4 steps of 0, 2, 4 and 6cm/sec in flow velocity in the flume tank for the experiment in order to examine those characteristics. We used two model seines designed on the scale of 1 to 180 based on the power block seine, which is the mackerel purse seine generally used in the near sea of Jeju Island and triplex seine, which is the mackerel purse seine of one boat system fishing expected in the future, for the experiment, and interpreted the characteristics of several motion in water, such as the shape of seine, the change in tension and area during pursing and its the analysis results are as follows. Though the experiment could be conducted up to 6cm/sec of flow velocity that was defined, the experiment could not go on because of the severe distortion in the seine at the flow velocity in excess of 6cm/sec. As for the depth of leadline and reduction rate of side area of seine when the pursing is connected, P seine turned out to be slightly higher than T seine, and the hauling speed and reduction rate of upper area of seine were found similar to each other. The correlation between the hauling time (Ht) and depth of lead line (Dhp, Dht) of P seine and T seine can be expressed by the equation, that is, Dhp=(0.99Pt-7.63)Pt+69.01, Dht=(1.03Pt-7.73)Pt+66.74. The correlation between the hauling time and hauling velocity (Hpp, Hpt) can be expressed by the equation, that is, $Hpp=-0.06Ht^2+0.88Ht+0.78,\;Hpt=-0.05Ht^2+0.81Ht+0.98$ here, Pt is pursing time. And the correlation between the pursing time and the reduction rate of side area (sArp, sArt) can be expressed by the equation, that is, $sArp=-0.48Pt^2+14.79Pt-16.74,\;sArt=-0.45Pt^2+14.56Pt-16.48$. The reduction rate of upper area of seine (tArp, tArt) can be expressed by the equation, that is, $tArp=0.34Pt^2-0.66Pt-0.74,\;tArt=0.34Pt^2-0.27Pt-1.80$. In addition, the correlation between the pursing time and tension of purse line (Tep, Tet) can be expressed by the equation, that is, $Tep=2.79Pt^2+2.26Pt-0.60,\;Tet=2.14Pt^2+8.08Pt-27.50$.

A Study for the Improvement of Top End Piece Structural Strength (상단고정체의 구조강도 개선을 위한 연구)

  • Song, Kee-Nam;Sohn, Dong-Seong
    • Nuclear Engineering and Technology
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    • v.21 no.3
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    • pp.186-192
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    • 1989
  • As a part of the design of the top end piece(TEP) for the 14$\times$14 reload fuel, various models of top end piece structure were analysed, using the ANSYS code, under fuel assembly shipping and handling load conditions. The 3-dimensional isoparametric elements were used in each model. By rearrangement of slots and holes on the adapter plate, without violating the design requirements, and also by changing the enclosure attachment method used on the adapter plate from pin joints to through-weld, the load carving capacity of the adapter plate was greatly strengthened. These concepts were adopted for the design of the 14$\times$14 reload fuel.

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