• Title, Summary, Keyword: 공학교육

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Awareness and Behavior of Elementary School Children on Children's Favorite Foods (초등학생의 어린이 기호식품에 대한 의식과 섭취 실태 조사)

  • Kim, Jong-Gyu;Jung, Min-Ji;Kim, Joong-Soon
    • Journal of Food Hygiene and Safety
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    • v.31 no.3
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    • pp.176-185
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    • 2016
  • This study was performed to investigate elementary school children's awareness on children's favorite foods and their consumption behavior of the foods. This study also focused on the association between the variables and gender/grade. We conducted a cross-sectional survey with direct interview among three hundreds and six elementary school children (188 boys and 118 girls) from 13 schools of a city of Korea, using a structured questionnaire. Among the overall proportion, more than 20% of the respondents did not know children's favorite foods and/or have no information source on the foods. More than 60% of the respondents consumed children's favorite foods more than 1 to 2 times a week. Only 16% respondents got information on children's favorite foods at home and 37% at school. There were significant correlations (p < 0.05) between gender/grades and knowledge/route of information on children's favorite foods. Boys had more knowledge than girls (p < 0.05), however they showed worse attitude on children's favorite foods and consumed more the foods. The higher grade children had more knowledge, better attitude and various routes of information on children's favorite foods (p < 0.05), but consumed more the foods. The results of this study indicate that there is a discrepancy between knowledge and attitude/behavior. This study also indicate that school food-service program and food hygiene/safety education in school and at home should be improved. Strong implementation of laws for regulation of selling adulterated food around elementary school may be another step in controlling consumption of the food by school children.

Prevalence of Toxin Genes and Profiles of Antibitoc Resistance in Vibrio vulnificus Isolates from Fish, Fish Tanks, and Patients (어류, 수족관수 및 환자에서 분리된 Vibrio vulnificus의 독소유전자 분포 및 항생제 내성)

  • Yoon, Yeon-Hee;Park, Sook;Kim, Jin Young;Lee, Ye Ju;Jeon, Doo-Young;Choi, Gyeong Cheol;Park, Jong Soo;Kim, Jung-Beom
    • Journal of Food Hygiene and Safety
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    • v.35 no.1
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    • pp.6-12
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    • 2020
  • Prevalence of toxin genes and profiles of antibiotic resistance in Vibrio vulnificus were investigated for prevention of Vibrio sepsis and selection of effective antibiotics. A total of 23 V. vulnificus strains were isolated from Vibrio sepsis patients, fish, and water samples collected from fish tanks in restaurants in Jeonnam province during 2015-2017 period. Prevalence of toxin genes including, RtxA, viuB and vvhA were assessed and susceptibilities to 15 different antibiotics were determined. As a result of the toxin gene profile, the RtxA toxin gene was detected in 19 (82.6%) out of 23 strains, and vvhA and viuB toxin genes were positive in all strains. These results showed that V. vulnificus tested in this study possessed at least one more toxin gene, and the toxin gene detection rate was higher than in previous reports. Therefore, there is always a risk of Vibrio sepsis through eating fish or having contact with aquarium water at seafood restaurants. Especially, it was deemed necessary to provide preventive education about Vibrio sepsis for workers in such restaurants. The results of antibiotic susceptibility tests presented 94.4% resistance to cepoxitin antibiotics but all strains showed susceptibility to 14 kinds of antibiotics including chloramphenicol and tetracycline. The currents antibiotic therapy using chloramphenicol and teteracycline against Vibrio sepsis was judged to be useful.

Estimation of Refractive Index in MIR range from the Reflectance Measurements for IR Optics Materials (반사율 측정에 의한 적외선 광학재료의 중적외선 굴절률 추정)

  • Jin, Doo-han;Jeong, Kyung-Seok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.6
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    • pp.411-416
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    • 2020
  • An optical arrangement has been set inside a photo-spectrometer to measure the reflectance of IR optics materials in mid IR range. The optical arrangement consists of equally spaced 4 gold coated full reflecting mirrors with the incidence angle of 45°. Baseline beam intensity IB has been measured while the beam proceeds through the 4 mirrors. Reflectance of a mirror has been estimated from the IB. And the beam intensity IS with the specimen in the optical path has been measured with the 4th mirror replaced with the specimen. Reflectance of the specimen has been estimated from the value of IS/IB. Then the estimated reflectance has been put in Fresnel equation relating reflectance and refractive index(RI) to estimate the RI of the material. Measurement has been made for sapphire, germanium, magnesium fluoride, and zinc sulfide. The estimated RI of the materials are closely matching with reference data and the maximum difference less than 2% over the wavelength range 3-5㎛ for all materials tested. As an FT-IR photo-spectrometer with a broadband wavelength infrared light source is used, this method has the advantage of measuring the refractive index at multiple wavelengths in a single measurement.

Evaluation of Mechanical Test Characteristics of Fillet Welding (필릿 용접의 기계적 시험 특성 평가)

  • Cho, Byung-Jun;Lee, Soung-Jun;Rhim, Jong-Guk
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.2
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    • pp.535-541
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    • 2020
  • FCAW is used mainly in the welding of carbon steel and alloy steel because it can be welded in all positions and can obtain excellent quality at sites with variable working conditions. Recently, many studies in Korea have estimated the fatigue strength, residual stress, and deformation, and to develop a fillet welding process. On the other hand, there have been few studies of the mechanical properties based on the strength, macro and magnetic particle test results for fillet welding. This study shows the following results through fillet welding, macro testing and strength testing using SM490A (solid-structure rolled steel) for thick plates using SS400 (rolled steel) for the upper plate and FCAW. The hardness test, macro test and magnetic particle test were then conducted. The hardness tests showed that all result values were smaller than the KS B 0893 standard values of 350Hv. The macro-test showed that each type of welded part was in a normal organic state and that there were no internal errors, bubbles, or impurities on the front of the welded part. Therefore, there were no concerns about lamination. The magnetic particle examination showed no problems.

Basic Research on Lighting Design for Learning Effect (학습효과 증진을 위한 조명설계에 대한 기초연구)

  • Lee, Boong-Joo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.4
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    • pp.518-524
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    • 2020
  • This study conducted basic research on an LED lighting design to improve the learning effect from brain wave analysis. The ideal environments of mathematics, language, and creative region can be different. Inside the space where the lighting environment can be experienced directly, the test subject consisted of common elements. Other lighting was blocked completely in controlled lighting conditions. The brain waves were analyzed according to the change in color temperature and illumination. The analyzer used was fabricated by EMOTIV Company. In the variable RGB LED light, the color of the light was measured, and the brain wave of each subject was determined. LED lights have variable color temperature (3000 [K], 4500 [K]. 250 [lux], 70% -350 [lux], 100% -500 [lux]). As research results, the highest concentration in a mathematics study was in the general condition of a high color temperature, in which the optimal condition was a 6000[K] color temperature and 350[lux] illumination. The optimal condition for a language study was a 4500[K] color temperature and 500[lux] illumination, and that of the creative study was 3000[K] color temperature and 500[lux] illumination. Overall, the possibility of emotional ability and concentrated learning efficiency can be improved by the LED lighting design with the color temperature and illumination.

An Exploratory Study on the Possibility of Using Next-Generation Technology in Long-term Care Facilities : Focusing on the Perception of the Workforce of in Long-term Care Facilities (노인장기요양시설의 차세대 기술 활용가능성에 대한 탐색적 연구 : 노인장기요양시설 인력의 인식을 중심으로 -)

  • Lee, Sun Hyung;Lim, Choon Hee;Kim, Weon Cheon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.5
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    • pp.191-205
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    • 2020
  • This study examined the possibility of utilizing next-generation technology, such as Virtual Reality or AI robots, in the long-term care facilities for the elderly. For the study, the Focus Group Interview was conducted in three different groups of 14 participants (care workers, social workers, and directors of long-term care facilities for the elderly). The analysis revealed a total of three topics, eight categories, and 26 sub-categories. The main results of the study showed that the use of next-generation technology could assist the psychological and emotional stability, provide curiosity and interest, and relieve the desire for physical activity for the elderly. In addition, for long-term care services staff, it could provide useful services for the elderly with physical constraints, facilitate effective management of the elderly roaming around, and enhance emotional support services. Finally, it could also help directors of long-term care facilities promote their services, educate staff, and keep up with current trends. Participants expressed concerns about the introduction of new technologies, but they generally expected that the application of next-generation technology would be positive for the elderly as well as for care workers and directors of long-term care facilities. Therefore, the use of next-generation technology in long-term care facilities for the elderly will also help develop gerontechnology.

Case Study on the Mitigation of Dangerous Slope Considering the Value of Geoheritage (지질유산 가치를 고려한 위험비탈면 보존 방안 사례 연구)

  • Jeong, Jun-Ho;Kim, Seung-Hyun;Park, Byung-suk;Woo, Yong-Hoon;Kang, Yun-seok;Koo, Ho-bon;Son, Moon
    • The Journal of Engineering Geology
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    • v.30 no.1
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    • pp.71-84
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    • 2020
  • Various geological structures are found on the slope of Bangnim district in Pyeongchang, Gangwon-do, based on the Paleozoic Joseon Supergroup Limestone. The recumbent fold observed on the slope is a very rare geological structure that has not been found in Korea, and has important academic value in exploring the formation process of the Paleozoic geological structures in the Gangwon region. In this study, discussed the geological value of the geological structure observed on the slope of the road, and studied the management method of rockfall problem slopes. The state of development of recumbent folds has conservation value in geological scarcity and specificity. Preservation management measures should be prepared through the protection of slopes and measures to reduce of rockfall risks as geoheritage with an important value in geology science and education. Furthermore, it is expected to be preserved and utilized as a geopark.

A Study on the Arrangement of 360 VR Camera for Music Performance Video (음악 공연 영상의 360 VR 카메라 배치에 관한 연구)

  • Nam, SangHun;Kang, DongHyun;Kwon, JoungHuem
    • Journal of Broadcast Engineering
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    • v.25 no.4
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    • pp.518-527
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    • 2020
  • 360 VR technology is used not only in movies, but also in performing arts such as music, theater, dance, and so on due to the characteristics of immersion and presence. The technology allows the audience can be perceived a feel of participation in a story. This study is conducted an analysis of the techniques of 360 video shooting in order to find the answers of the following questionaries: how to make viewers enhance to a better understanding of a space, how to make the viewer feel comfortable ceding control of the experience, how to generate greater empathy with a 360 video. Thirty cases were analysed 360-degree videos of live performances performed on stage among 360-degree images of music performance content shared on Youtube from 2015 to 2020. The result shows that live performances are performed with the audience, so the stage shape and the layout of the audience seats are preferred to the characteristics of the performance. It was also shown that directing using a 360 VR camera was also greatly affected by the stage and audience placement. The stage is manly classified into three types, and the camera layout and characteristics mainly used are organized according to the number of 360 VR cameras, whether fixed or mobile cameras are used.

Preliminary study on rupture mechanism of the 9.12 Gyeongju Earthquake (9.12 경주지진의 지진발생기작 예비연구)

  • Kim, Young-Seog;Kim, Taehyung;Kyung, Jai Bok;Cho, Chang Soo;Choi, Jin-Hyuck;Choi, Chul Uong
    • Journal of the Geological Society of Korea
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    • v.53 no.3
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    • pp.407-422
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    • 2017
  • On $12^{th}$ September, 2016, the $M_L=5.8$ Gyeongju Earthquake (KMA), the biggest instrumental earthquake in South Korea, occurred in Naenam-myeon, Gyeongju, and about 600 aftershock events continued for at least 6 months around the epicenter area. This event is enough for the publics to be afraid of earthquakes, and furthermore to believe that the Korean Peninsula is tectonically unstable and destructive shocks may occur in the future. Also a new social concern about earthquake mechanism and active fault is increased throughout the country. In general, earthquake is a result of abrupt slip (or rupture) of pre-existing fault, and hence it is important to interpret geometry, strike/dip, type, slip sense, and intersections between faults around the epicenter in order to understand earthquake rupture mechanism. Here, we have investigated faults around the epicenter, where aftershocks clustered, to infer the rupture mechanism of the 9.12 Gyeongju Earthquake. In particular, using airborne LiDAR images, we have analyzed geomorphic features and lineaments to find potential active faults. As a result, we infer that the 9.12 Gyeongju Earthquake occurred on a subsidiary fault in the western damage zone of the Yangsan Fault and that this attributes to linking damage zones either at the linking zone between central and southern segments of the Yangsan Fault, or between the Yangsan Fault and the newly named Deokcheon Fault (a subsidiary fault of the Yangsan Fault).

Analysis of Benzene Concentration Reduction with a Public-private Cooperative (민관 협치를 통한 벤젠의 배경농도 저감 사례 분석)

  • Shin, Jin-Soo;Chung, Jin-Do
    • 한국환경기술학회지
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    • v.19 no.5
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    • pp.427-434
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    • 2018
  • This study analyzes the effect of public-private partnership for reduction of concentration of benzene that is emitted from Ulsan petrochemical complex. Despite the fact that from 2012 to 2016 each factory had been observing legal standards, according to measurements of concentrations of benzene by the monitoring station in Yeocheon-dong, Ulsan, for five successive years, benzene concentrations had been exceeding the environmental standards for air quality ($5{\mu}g/m^3$) by 1.4 to 1.8 times, resulting in endless civil petitions. On the other hand, in 2017, when a cooperation system was constructed across private, public and research institutions and actors, through the formation of a network for information-sharing among, and professional education to reinforcement of competency among the Ministry of Environment, the National Institute of Environmental Research, conglomerates, and local businesses of Ulsan, Benzene concentration became $4.25{\mu}g/m^3$, satisfying the atmosphere environmental standard. According to the analysis, cooperation built based upon mutual trust between the public sector and the civil sector has made it possible to solve, in a year, the regional environmental problem, i.e., excessive benzene concentrations for 5 years. Henceforth, along with research on measures to share and spread out advanced technology and case-studies, targeting other regions where benzene concentrations have not yet improved, research on methods to maintain benzene concentrations as they are is needed.