• 제목/요약/키워드: Dual process

검색결과 1,012건 처리시간 0.025초

대형 LCD 패널 제조용 복합재 롤러의 회전체 동역학 해석 (Rotordynamic Analyses of a Composite Roller for Large LCD Panel Manufacturing)

  • 박효근;최진호;권진회;이영환;양승운;김동현
    • Composites Research
    • /
    • 제19권6호
    • /
    • pp.8-15
    • /
    • 2006
  • 본 연구에서는 대형 LCD 패널 제조용 복합재 롤러에 대한 3차원 회전체 동역학 해석을 수행하였다. 전산해석은 로터시스템의 회전에 의한 자이로스코픽 영향을 고려한 일반적인 유한요소법에 근거하고 있다. 본 연구에서는 유럽의 범용 상용 유한요소해석 프로그램인 SAMCEF를 활용하였으며 이는 전문적인 로터해석 모듈을 포함하고 있다. 전산해석 기법의 검증을 위해 베어링 지지된 2중 회전축 로터 모델에 대한 해석 및 비교결과를 제시하였다. 설계된 복합재 롤러 모델에 대한 상세 유한요소 모델을 구축하였으며, 중력 효과를 고려한 전산해석을 통하여 실제 운용환경에서의 진동특성을 고찰하였다. 이의 결과로 다른 회전조건에 대한 로터 안정성 선도 및 불평형 응답에 대한 결과들을 제시하였다.

글로벌 교원 양성을 위한 IT 융합 글로벌 교육 방법 (IT Fusion Global Education Methods for Fostering Global Teachers)

  • 강주영;김성백;권상철
    • 예술인문사회 융합 멀티미디어 논문지
    • /
    • 제6권4호
    • /
    • pp.341-349
    • /
    • 2016
  • 글로벌 시대의 요구에 부응하기 위해 교육 분야에서도 글로벌 교육에 대한 필요성과 중요성이 급증하고 있다. 하지만 보는 관점에 따라 글로벌 교육의 정의와 모델에 대한 합의가 아직 명확하지 않고 글로벌 교육 과정에서의 고비용성, 저효과성, 지속성 결여 등으로 인해 실제 글로벌 교육의 성과는 예상보다 기대에 미치지 못하고 있다. 더구나 예비 교원의 글로벌 능력을 함양하기 위한 글로벌 교육에 관한 연구는 거의 이루지지지 않고 있다. 본 연구는 예비 교원의 글로벌 교육을 중심으로 IT 융합 접근 방법을 연구하였다. 본 연구에서는 우선 국내에서 시행되고 있는 글로벌 교원 양성을 위한 글로벌 교육 프로그램을 비교 분석하였다. 또한, 글로벌 교육에서의 제약 사항들을 해결할 수 있는 IT 융합 교육 시스템을 연구하여 구체적인 IT 융합 글로벌 교육 방법들을 알아보았다. 특히 빅데이터 분석 기술을 기반으로 복수학위나 교환학생 프로그램에 도움을 줄 수 있는 글로벌 교육과정 이수 추천 시스템을 제시하였다.

수평형(水平型) 이열(二列) 조합판(組合板)의 투과율(透過率) 산정(算定)을 위한 실험적(實驗的) 연구(硏究) (Experimental Study on Energy Transmission Rate of Horizontal Dual Plate by Random Wave System)

  • 권혁민;김영학;기성태
    • 대한토목학회논문집
    • /
    • 제28권4B호
    • /
    • pp.421-428
    • /
    • 2008
  • 최근 들어 우리나라 전해역에 걸쳐 발생하고 있는 침식은 사회적인 문제가 되어왔다. 하지만, 해안구조물에 의한 기존의 방법으로 해안선을 보호하는 것이 "파랑장에 친화적인가?"라는 관점에서 개선의 여지가 있다. 새로운 형식의 철재형 이안제는 권혁민 등(2007)에 의해 제안되었다. 본 형식은 다수의 파일과 상부에 파랑진행방향과 수평으로 설치된 소파장치로 구성되어 있다. 본 형식은 해수유통원활, 대수심 축조수월, 공기단축 등의 장점이 있다. 본 연구는 소파제로서 철재형 이안제의 상부에 거치가 가능한 이열 조합판의 투과율을 실험적으로 평가했다. 일방향 불규칙파 시스템에 의한 모형실험을 통하여 반사율, 소파율, 투과율에 관하여 분석했다. 실험결과, 파형경사가 클수록 그리고 조합판의 폭-파장비가 클수록 투과율이 작아짐을 보였다. 본 연구는 이열 소파판 조합에 대하여 투과율 산정을 위한 직선식을 제안했다.

Putting Images into Second Language: Do They Survive in the Written Drafts?

  • Huh, Myung-Hye
    • 영어영문학
    • /
    • 제56권6호
    • /
    • pp.1255-1279
    • /
    • 2010
  • Much has already been learned about what goes on in the minds of second language writers as they compose, yet, oddly enough, until recently little in the L2 research literature has addressed writing and mental imagery together. However, images and imaging (visual thinking) play a crucial role in perception (the basis of mental imagery), in turn, affecting language, thinking, and writing. Many theorists of mental imagery also agree that more than just language accounts for how we think and that imagery is at least as crucial as language. All of these demands, to be sure, are compounded for EFL students, which is why I investigate EFL students' writing process, focusing on the use of mental imagery and its relationship to the writing. First I speculate upon some ways that imagery influences EFL students' composing processes and products. Next, I want to explore how and whether the images in a writer's mind can be shaped effectively into a linear piece of written English in one's writing. I studied two university undergraduate EFL students, L and J. They had fairly advanced levels of English proficiency and exhibited high level of writing ability, as measured by TOEFL iBT Test. Each student wrote two comparison and contrast essays: one written under specified time limitations and the other written without the pressure of time. In order to investigate whether the amount of time in itself causes differences within an individual in imagery ability, the students were placed under strict time constraints for Topic 1. But for Topic 2, they were encouraged to take as much time as necessary to complete this essay. Immediately after completing their essays, I conducted face-to-face retrospective interviews with students to prompt them for information about the role of imagery as they write. Both L and J have spent more time on their second (untimed) essays. Without time constraint, they produced longer texts on untimed essay (149 vs. 170; 186 vs 284 words). However, despite a relatively long period of time spent writing an essay, these students neither described their images nor detailed them in their essays. Although their mental imagery generated an explosion of ideas for their writings, most visual thinking must merely be a means toward an end-pictures that writers spent in purchasing the right words or ideas.

항만 관련 공공갈등 유형화에 관한 연구 (A study on categorizating public-related conflicts in the port sector)

  • 이혜령;김가현;김세원
    • 한국항만경제학회지
    • /
    • 제39권3호
    • /
    • pp.141-153
    • /
    • 2023
  • 최근 갈등의 관리가 주요한 과제로 떠오르고 있다. 그 중 공공정책의 추진에 따라 발생하는 공공갈등은 사회적으로 부정적 효과를 가져올 수 있기 때문에 갈등을 효과적으로 잘 관리하는 것은 매우 중요하다. 이에 본 연구는 항만 관련 공공갈등의 특성을 면밀히 살펴봄으로써 항만과 관계된 공공정책의 원활한 추진을 위한 기반을 마련하고자 하였다. 본 연구는 항만 분야에서 발생한 갈등사례를 다양한 채널을 통해 수집하고 유형화를 실시하여 항만 관련 갈등의 특성을 보다 면밀히 살펴보고자 하였다는 점에서 의의를 지닌다. 본 연구의 결과를 요약하면 다음과 같다. 첫째, 본 연구는 주체별, 생애주기별, 쟁점별 특성을 고려하여 항만 관련 공공갈등을 유형화하였으며, 이를 통해 항만을 둘러싼 갈등은 다양한 쟁점을 지니고 있음을 확인하였다. 둘째, 지금까지 발생한 항만 관련 공공갈등은 강제력이 높은 방식으로 종결된 사례가 많다. 다만, 갈등 유형에 따라 합의로 종결되는 사례가 많은 경우도 있으므로 갈등발생시 조속한 종결유도를 위한 판단이 필요하다. 셋째, 항만 관련 공공갈등의 관리를 위해 사전예방, 사후대응의 이원적 체계를 마련할 필요가 있다.

방사능 방호 제품에 대한 KOLAS 인증 방안 연구 - 마스크를 중심으로 (Study on KOLAS Certification Approach for Radiation Protection Products - Focusing on Masks)

  • 박남희;여욱현;홍성진
    • 한국재난정보학회 논문집
    • /
    • 제19권4호
    • /
    • pp.815-825
    • /
    • 2023
  • 연구목적: 본 논문은 방사선비상계획구역 내 거주하는 주민의 방사능재난 발생시 대피과정에서 사용할 수 있는 방호제품으로서 마스크를 개발하는 과정에서 KOLAS 인증을 받을 수 있는 방안을 연구하는 것이다. 연구방법: 각종 보고서와 논문, KOLAS 인정기구 및 각종 마스크 홈페이지 자료를 조사하여 연구하였다. 연구결과: 국내 방사능재난방재대책을 수립하여 주민보호조치를 강화하고 있으나 방호제품 보급은 갑상샘방호약품이 유일하다. 방사능재난에 대비하여 마스크와 같은 보조적인 지원용품 보급이 필요하다. 방호마스크를 공인인증할 수 있는 KOLAS 인정 공인기관이 없는 실정이다. 결론: 성능 인증 기준이 있는 마스크의 경우 산업용 방진마스크로 공인시험성적서를 발급받고 인증을 받은 후에 자체 기준으로 일반성적서를 받는 이중 과정을 거쳐서 마스크의 KOLAS 인증이 가능하다.

Research on the deformation characteristics and support methods of the cross-mining roadway floor influence by right-angle trapezoidal stope

  • Zhaoyi Zhang;Wei Zhang
    • Geomechanics and Engineering
    • /
    • 제37권3호
    • /
    • pp.293-306
    • /
    • 2024
  • Influenced by the alternating effects of dynamic and static pressure during the mining process of close range coal seams, the surrounding rock support of cross mining roadway is difficult and the deformation mechanism is complex, which has become an important problem affecting the safe and efficient production of coal mines. The paper takes the inclined longwall mining of the 10304 working face of Zhongheng coal mine as the engineering background, analyzes the key strata fracture mechanism of the large inclined right-angle trapezoidal mining field, explores the stress distribution characteristics and transmission law of the surrounding rock of the roadway affected by the mining of the inclined coal seam, and proposes a segmented and hierarchical support method for the cross mining roadway affected by the mining of the close range coal seam group. The research results indicate that based on the derived expressions for shear and tensile fracture of key strata, the ultimate pushing distance and ultimate suspended area of a right angle trapezoidal mining area can be calculated and obtained. Within the cross mining section, along the horizontal direction of the coal wall of the working face, the peak shear stress is located near the middle of the boundary. The cracks on the floor of the cross mining roadway gradually develop in an elliptical funnel shape from the shallow to the deep. The dual coupling support system composed of active anchor rod support and passive U-shaped steel shed support proposed in this article achieves effective control of the stability of cross mining roadways, which achieves effective control of floor by coupling active support and preventive passive support to improve the strength of the surrounding rock itself. The research results are of great significance for guiding the layout, support control, and safe mining of cross mining roadways, and to some extent, can further enrich and improve the relevant theories of roof movement and control.

심근 핵의학 검사에서 다양한 방사성핵종 조건에 따른 내부피폭선량 평가: 몬테카를로 시뮬레이션 (Evaluation of Internal Dosimetry according to Various Radionuclides Conditions in Nuclear Medicine Myocardial Scan: Monte Carlo Simulation)

  • 이민관;박찬록
    • 대한방사선기술학회지:방사선기술과학
    • /
    • 제47권3호
    • /
    • pp.213-218
    • /
    • 2024
  • The myocardial nuclear medicine examination is widely performed to diagnose myocardium disease using various radionuclides. Although image quality according to radionuclides has improved, the radiation exposure for target organ as well as peripheral organs should be considered. Here, the aim of this study was to evaluate absorbed dose (Gy) for peripheral organs in myocardial nuclear medicine scan from myocardium according to various scan environments based on Monte Carlo simulation. The simulation environment was modeled 5 cases, which were considered by radionuclides, number of injections, and radiodosage. In addition, the each radionuclide simulation such as distribution fraction was considered by recommended standard protocol, and the mesh computational female phantom, which is provided by International Commission on Radiological Protection (ICRP) 145, was used using the particle and heavy ion transport code system (PHITS) version 3.33. Based on the results, the closer to the myocardium, the higher the absorbed dose values. In addition, application for dual injection for radionuclides leaded to high absorbed dose compared with single injection for radionuclide. Consequently, there is difference for absorbed dose according to radionuclides, number of injections, and radiodosage. To detect the accurate diseased area, acquisition for improved image quality is crucial process by injecting radionuclides, however, we need to consider absorbed dose both target and peripheral inner organs from radionuclides in terms radiation protection for patient.

Unlocking the Therapeutic Potential of BCL-2 Associated Protein Family: Exploring BCL-2 Inhibitors in Cancer Therapy

  • Bisan El Dakkak;Jalal Taneera;Waseem El-Huneidi;Eman Abu-Gharbieh;Rifat Hamoudi;Mohammad H. Semreen;Nelson C. Soares;Eman Y. Abu-Rish;Mahmoud Y. Alkawareek;Alaaldin M. Alkilany;Yasser Bustanji
    • Biomolecules & Therapeutics
    • /
    • 제32권3호
    • /
    • pp.267-280
    • /
    • 2024
  • Apoptosis, programmed cell death pathway, is a vital physiological mechanism that ensures cellular homeostasis and overall cellular well-being. In the context of cancer, where evasion of apoptosis is a hallmark, the overexpression of anti-apoptotic proteins like Bcl2, Bcl-xL and Mcl-1 has been documented. Consequently, these proteins have emerged as promising targets for therapeutic interventions. The BCL-2 protein family is central to apoptosis and plays a significant importance in determining cellular fate serving as a critical determinant in this biological process. This review offers a comprehensive exploration of the BCL-2 protein family, emphasizing its dual nature. Specifically, certain members of this family promote cell survival (known as anti-apoptotic proteins), while others are involved in facilitating cell death (referred to as pro-apoptotic and BH3-only proteins). The potential of directly targeting these proteins is examined, particularly due to their involvement in conferring resistance to traditional cancer therapies. The effectiveness of such targeting strategies is also discussed, considering the tumor's propensity for anti-apoptotic pathways. Furthermore, the review highlights emerging research on combination therapies, where BCL-2 inhibitors are used synergistically with other treatments to enhance therapeutic outcomes. By understanding and manipulating the BCL-2 family and its associated pathways, we open doors to innovative and more effective cancer treatments, offering hope for resistant and aggressive cases.

International Digestive Endoscopy Network consensus on the management of antithrombotic agents in patients undergoing gastrointestinal endoscopy

  • Seung Joo Kang;Chung Hyun Tae;Chang Seok Bang;Cheol Min Shin;Young-Hoon Jeong;Miyoung Choi;Joo Ha Hwang;Yutaka Saito;Philip Wai Yan Chiu;Rungsun Rerknimitr;Christopher Khor;Vu Van Khien;Kee Don Choi;Ki-Nam Shim;Geun Am Song;Oh Young Lee
    • Clinical Endoscopy
    • /
    • 제57권2호
    • /
    • pp.141-157
    • /
    • 2024
  • Antithrombotic agents, including antiplatelet agents and anticoagulants, are widely used in Korea because of the increasing incidence of cardiocerebrovascular disease and the aging population. The management of patients using antithrombotic agents during endoscopic procedures is an important clinical challenge. The clinical practice guidelines for this issue, developed by the Korean Society of Gastrointestinal Endoscopy, were published in 2020. However, new evidence on the use of dual antiplatelet therapy and direct anticoagulant management has emerged, and revised guidelines have been issued in the United States and Europe. Accordingly, the previous guidelines were revised. Cardiologists were part of the group that developed the guideline, and the recommendations went through a consensus-reaching process among international experts. This guideline presents 14 recommendations made based on the Grading of Recommendations, Assessment, Development, and Evaluation methodology and was reviewed by multidisciplinary experts. These guidelines provide useful information that can assist endoscopists in the management of patients receiving antithrombotic agents who require diagnostic and elective therapeutic endoscopy. It will be revised as necessary to cover changes in technology, evidence, or other aspects of clinical practice.