• Title, Summary, Keyword: Engineering education

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Assessment of Multiple Delamination in Laminated Composites for Aircrafts using X-ray Backscattering (X-ray 후방산란 기술을 이용한 항공기용 복합재료의 다중 층간 박리 평가)

  • Kim, Noh-Yu
    • Journal of the Korean Society for Nondestructive Testing
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    • v.30 no.1
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    • pp.46-53
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    • 2010
  • A Compton X-ray backscatter technique has been developed to quantitatively assess impact damage in quasi-isotropic laminated composites made by a drop-weight tester. X-ray backscatter imaging system with a slit-type camera is constructed to obtain a cross-sectional profile of impact-damaged laminated composites from the electron-density variation of the cross section. A nonlinear scattering model based on Boltsman equation is introduced to compute Compton X-ray backscattering field for the defect assessment. An adaptive filter is also used to reduce noises from many sources including quantum noise and irregular distributions of fibers and matrix in composites. Delaminations masked or distorted by the first delamination are detected and characterized effectively by the Compton X-ray backscatter technique, both in width and location, by application of error minimization algorithm.

A Study on Generation and Parsing System for MPEG-21 Broadcasting Digital Item (MPEG-21 방송 디지털 아이템을 위한 생성 및 파싱 시스템에 대한 연구)

  • 김천석;한희준;노용만;남제호;홍진우
    • Journal of Broadcast Engineering
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    • v.8 no.1
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    • pp.80-90
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    • 2003
  • Today, thanks to the spread of Internet and the development of various multimedia technologies, broadcasting environment is changing in a way to merging broadcasting and communication environment. In such a new environment, transparent delivery and interoperability between different technologies become an important issue. In ISO/IEC MPEG meeting, MPEG-21 has been established. In MPEG-21, it is discussed actively about big picture to build an infrastructure for the delivery and consumption of multimedia contents. In this paper, we have applied Digital Item in MPEG-21 to broadcasting contents. Broadcasting Digital Item is generated using MPEG-7 MDS for the description of resources as well as Digital Item Declaration, and Digital Item Identification. Furthermore, we develop Digital Item generation system and parsing system. In experiment, we verify the usefulness of Broadcasting Digital Item by generating an education video contents and consuming it at different user environments.

A Study on the Recognition of Information Accepter about Civil Defence Alert Broadcasting (민방위 경보 방송에 대한 정보 수용자 인식 연구)

  • Kwak, Chunsub;Kyung, Ilsoo;Lee, Hyunji
    • Journal of Broadcast Engineering
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    • v.20 no.6
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    • pp.827-836
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    • 2015
  • The purpose of this study is to suggest improvement direction of the delivery system through researching the information accepter' recognition and use about warning delivery system. According to the survey, they listen to civil defence alert broadcasting on mass media more than personal media. The frequency of alert broadcasting is significantly very low and they listen to it below 5 times in a year. Also, nearly one in four people says its siren and contents are indistinct. Alert broadcasting's siren shows less memory retrieval and sorting capability than others and the result shows that they will act based on the broadcasting instead of reacting to prior knowledge in real situations. Finally, the result shows that improving public awareness through education and publicity more than social system buildup is important in civil defence alert system.

Extraction kaolin minesin Hadong Area using ASTER image (ASTER 영상 자료를 이용한 하동지역 고령토 광산 분포 추출)

  • LEE, Hong-Jin;KIM, In-Joon;PARK, Maeng-Eon;CHI, Kwang-Hoon;BAEK, Seung-Gyun;KO, Kyoungtae
    • Journal of The Geomorphological Association of Korea
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    • v.21 no.4
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    • pp.121-131
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    • 2014
  • This study analyzed the spectral reflectance characteristics of kaolinite and ASTER(Advanced Spaceborne Thermal Emission and Reflectance Radiometer) image to extract the distribution of kaolin mines in Hadong area, Gyeongsangnam-do. The band ratio model was applied to extract kaolinite using difference of wavelength absorption band distinct feature of minerals from ASTER image which is the major mineral of kaolin mines. According to the spectral reflectance curve of kaolinite, it showed the absorption features around 0.96 and $2.18{\mu}m$ by Al-OH. Also, it affected 1.24 and $1.38{\sim}1.41{\mu}m$ by OH. Applying for new band ratio model from the spectral features of kaolinite to ASTER image, it is possible to make the distribution map of mining traces including present- developing kaolin mines.

The Strategies of Logistics Management for SMEs through CALS/EC under the Circumstance supervised by IMF (IMF 환경하에서 CALS/EC를 통한 중소기업 물류경영 전략)

  • Ku, Keun-Wan;Kim, Chang-Gyun
    • Journal of Distribution Science
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    • v.1 no.1
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    • pp.1-24
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    • 1999
  • CALS/EC is about doing business electronically. It is based on the electronic processing and transmission of data, including text, sound and video. It encompasses many diverse activities including electronic trading of goods and services, online delivery of digital content, electronic fund transfers, electronic share trading, electronic bills of lading, commercial auctions, collaborative design and engineering, online sourcing, public procuremet, direct consumer marketing, and after-sales service. It involves both products(e.g. consumer goods, specialised medical equipment) and services(e.g. information services, financial and legal services); traditional activities(e.g. healthcare, education) and new activities (e.g. virtual malls). CALS/EC will be emerging to replace and substitute the role of the conventional market. By changing and eliminating some processes of the transactions, the electronic market and the electronic commerce will redistribute the power and hence the benefits of the market activities. Traditional way of doing business may enter into the new electronic market because the role and function of trust and established reputation will be reinforced in the electronic market. The CALS/EC through the Internet has been in the spotlight in the shopping behavior of the consumers. Accordingly Corporates are trying to adapt themselves to those rapidly changing environments being affected by the Internet. Among others, particularly to be noted is the CALS/EC between corporations and consumers whose potential growth can be considered very substantial. This report, focusing on the introduction of CALS/EC for the logistics of SMEs, will allow us to prepare more efficiently for the coming 21st Century. It is obvious that CALS/EC is fast becoming the useful way of exchanging not only information but products in business between firm-to-firm and firm-to-customer.

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Application and Prospects of Molecular Imaging (분자영상의 적용분야 및 전망)

  • Choi, Guyrack;Lee, Sangbock
    • Journal of the Korean Society of Radiology
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    • v.8 no.3
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    • pp.123-136
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    • 2014
  • In this paper, we study to classify molecular imaging and applications to predict future. Molecular imaging in vivo at the cellular level and the molecular level changes taking place to be imaged, that is molecular cell biology and imaging technology combined with the development of the new field. Molecular imaging is used fluorescence, bioluminescence, SPECT, PET, MRI, Ultrasound and other imaging technologies. That is applied to monitoring of gene therapy, cell tracking and monitoring of cell therapy, antibody imaging, drug development, molecular interaction picture, the near-infrared fluorescence imaging of cancer using fluorescence, bacteria using tumor-targeting imaging, therapeutic early assessment, prediction and therapy. The future of molecular imaging would be developed through fused interdisciplinary research and mutual cooperation, which molecular cell biology, genetics, chemistry, physics, computer science, biomedical engineering, nuclear medicine, radiology, clinical medicine, etc. The advent of molecular imaging will be possible to early diagnosis and personalized treatment of disease in the future.

Historical Meaning through Technological Issues on Photography (기술적 관점에서 바라본 사진사에 대한 고찰)

  • Kim, Sang-Ki;Kim, Yoo-Jin
    • The Journal of the Korea Contents Association
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    • v.12 no.10
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    • pp.93-105
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    • 2012
  • Science and technology are deeply based on the invention of photography. The images that were made through machines and scientific process were not just delicate images. Photography was used wherever accurate record and realistic description were needed, such as public culture, art, advertisement, science research and so on, so it became an important part of anthropologic culture. However, the history of photography in the present photography education mainly deal with photographic tendency of famous photographers, the change of art paradigm by time period, social changes through big wars, thus there is a lack of diverse perspective in the history of photography, such as technological perspective. In this study, the history of photography was examined through science and technology, and analyzed how photography was affected and changed by the stage of important technological accomplishment. From this point of view, It will be helpful to understand modern photography, and meaningful to be a good reference. Furthermore, by understanding that photography relies on technology, the people who majored in photography will realize how important studying photographic technology and theories is.

An Experimental Study on the Flexural Behavior of Deck Plates with Metal Lath and Mortar (라스와 모르타르를 이용한 데크의 휨거동에 관한 실험적 연구)

  • Kim, Sung-Bae;Kim, Sung-Jin;Seo, Dong-Min;Kim, Sang-Seup
    • Journal of the Korea Concrete Institute
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    • v.20 no.1
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    • pp.117-125
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    • 2008
  • In the domestic construction industry field nowadays, the usage of deck plates is currently increasing due to the lack of construction workers and the rised in construction cost. However, using deck plates manufactured by thin zinc galvanization in underground structures is criticised because it can lead to increase in maintenance cost caused by rust generation and water leakage. As a solution for this particular problem, deck plates created by Lath and Mortar instead of zinc galvanized steel sheets were developed. This paper deals with the experimental study on flexural behavior of deck plate using metal lath and mortar. Seventeen fullscale specimens were constructed and tested with different type of truss, the diameter of the top and bottom bar, and the thickness of slab. Tests results show that LAMO deck displayed equal performance such as zinc galvanized steel sheets.

A Model for Protective Behavior against the Harmful Effects of Radiation based on Medical Institution Classifications (의료기관 형태별 방사선장해 방어행위 모형)

  • Han, Eun-Ok;Kwon, Deok-Mun;Dong, Kyung-Rae;Han, Seung-Moo
    • Journal of Radiation Protection and Research
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    • v.35 no.4
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    • pp.157-162
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    • 2010
  • This study surveyed a total of 1,322 radiation technologist in health care institutions throughout Korea. This is a comparative study conducted on the levels of protective behavior against the harmful effects of radiation in heath care institutions which indicated that university hospitals and general hospitals showed higher level of protective behavior than for medical practitioners. This study found university hospitals have the following 7 characteristics to manage protective behavior against the harmful effects of radiation, protective environment, self-efficacy by distinction of task, self-efficacy, expectation of the protective behavior, the number of patients, level of the education related to the protection of the harmful effects of radiation and protective attitude. While general hospitals have the following 3 characteristics protective environment, expectation of the protective behavior and protective attitude. Hospitals have the following 4 characteristics protective environment, expectation of the protective behavior, protective attitude and self-efficacy. and medical clinics have characteristics protective environment.

Thermographic Inspection of Fatigue Crack by Using Contact Thermal Resistance (접촉 열저항 효과를 이용한 피로균열의 적외선검사)

  • Yang, Seungyong;Kim, Nohyu
    • Journal of the Korean Society for Nondestructive Testing
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    • v.33 no.2
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    • pp.187-192
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    • 2013
  • Fatigue crack was detected from a temperature change around surface crack using the thermographic technique. Thermal gradient across the crack decreased very much due to thermal resistance of contact surface in the crack. Heat diffusion flow passing through the discontinuity was visualized in temperature by infrared camera to find and locate the crack. A fatigue crack specimen(SM-45C), which was prepared according to KS specification and notched in its center to initiate fatigue crack from the notch tip, was heated by halogen lamp at the end of one side to generate a heat diffusion flow in lateral direction. A abrupt jump in temperature across the fatigue crack was observed in thermographic image, by which the crack could be located and sized from temperature distribution.