• Title/Summary/Keyword: Technology-Fusion research

Search Result 1,083, Processing Time 0.035 seconds

Study of high Speed Laser Cutting of LED Module (LED 모듈의 초고속 레이저 절단을 위한 연구)

  • Choi, Won Yong;Choa, Sung-Hoon
    • Journal of the Microelectronics and Packaging Society
    • /
    • v.24 no.1
    • /
    • pp.91-101
    • /
    • 2017
  • In this study, we conducted the preliminary research for high speed laser cutting of LED module. In particular, the feasibility of ultra-high speed laser cutting of 100 mm/s which exceeds the cutting speed of conventional dicing saw was examined. For this, copper/ceramic and silicone/ceramic hybrid substrates, which are the components of the LED module, were fabricated, and the surface morphology, surface roughness and flexural strength of the laser-cut samples were investigate and compared with the dicing-cut samples. To investigate optimal laser cutting conditions for hybrid substrates, the effects of various laser cutting conditions on cutting surface characteristics were studied using single ceramic and copper substrate. Optimal laser cutting conditions of the hybrid substrates were the use of Ar assist gas, high laser power and high assist gas pressure. Comparing the cutting surface of the hybrid substrates, the surface characteristics of the laser-cut samples are slightly inferior to those of the dicing-cut samples. The average surface roughness of the laser-cut samples was about $9{\mu}m$, and that of the dicing-cut samples was about $4{\mu}m$. However, considering very low cutting speed (3 mm/s) of the dicing saw, the surface morphology of the laser-cut sample was relatively uniform, and the surface roughness was not much different from that of the dicing-cut sample. The flexural strength of the laser-cut samples was equivalent to or slightly inferior to the flexural strength of dicing-cut samples. However, if the laser processing conditions are sufficiently optimized, the ultra-high speed laser cutting of the LED module will be possible.

Color, Volatiles and Organoleptic Acceptability of Mixed Powders of Red Ginseng and Cheonggukjang (홍삼과 청국장 혼합 분말의 색도, 휘발성 성분 및 관능적 기호도)

  • Kwon Joong-Ho;Shin Jin-Ki;Moon Kwang-Deog;Chung Hun-Sik;Jeong Yong-Jin;Lee Eun-Joo;Ahn Dong-U.
    • Food Science and Preservation
    • /
    • v.13 no.4
    • /
    • pp.483-489
    • /
    • 2006
  • Considering the development of fusion ingredients rom red ginseng and Cheonggukjang (soybean-fermented food), their commercial powders were evaluated in their Hunter's colors, volatile compounds, and sensory properties depending on manufacturing companies and mixing ratio of both powdered products. Hunters L, a and b values of red ginseng powders were $75.56\sim85.50,\;1.90\sim6.30,\;and\;23.29\sim35.08$, respectively, while those of Cheonggukjang powders were $64.96\sim71.69,\;4.64\sim8.30,\;and\;30.45\sim36.50$, respectively. Volatile compounds were mainly composed of hexanal, $\beta-pinene$, methyl benzene, 3,5-methyl propyl nonane, 2-propanone, decane, and 2,8-dimethyl undecane in red ginseng samples, and of 2,3-butanedione, decane, 2,2,7,7-tetramethyl octane, and 3-methyl butanal in Cheonggukjang samples. Total volatiles of the mixed samples decreased as ginseng decreased and Cheonggukjang increased. The mixed sample of both red ginseng and cheonggukjang in same amounts was the highest in its sensory acceptability, which was composed in the order of 2-propanone, 2-butanone, pentane, hexanal and 3-methyl butanal. The above results indicate that red ginseng and Cheonggukjang showed a potential as fusion ingredient for preparing new functional produce through further processing.

Characteristics of Flexible Transparent Capacitive Pressure Sensor Using Silver Nanowire/PEDOT:PSS Hybrid Film (은나노와이어·전도성고분자 하이브리드 필름을 이용한 유연 투명 정전용량형 압력 센서의 특성)

  • Ahn, Young Seok;Kim, Wonhyo;Oh, Haekwan;Park, Kwangbum;Kim, Kunnyun;Choa, Sung-Hoon
    • Journal of the Microelectronics and Packaging Society
    • /
    • v.23 no.3
    • /
    • pp.21-29
    • /
    • 2016
  • In this paper, we developed a flexible transparent capacitive pressure sensor which can recognize X and Y coordinates and the size of force simultaneously by sensing a change in electrical capacitance. The flexible transparent capacitive pressure sensor was composed of 3 layers which were top electrode, pressure sensing layer, and bottom electrode. Silver nanowire(Ag NW)/poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) hybrid film was used for top and bottom flexible transparent electrode. The fabricated capacitive pressure sensor had a total size of 5 inch, and was composed of 11 driving line and 19 sensing line channels. The electrical, optical properties of the Ag NW/PEDOT:PSS and capacitive pressure sensor were investigated respectively. The mechanical flexibility was also investigated by bending tests. Ag NW/PEDOT:PSS exhibited the sheet resistance of $44.1{\Omega}/square$, transmittance of 91.1%, and haze of 1.35%. Notably, the Ag NW/PEDOT:PSS hybrid electrode had a constant resistance change within a bending radius of 3 mm. The bending fatigue tests showed that the Ag NW/PEDOT:PSS could withstand 200,000 bending cycles which indicated the superior flexibility and durability of the hybrid electrode. The flexible transparent capacitive pressure sensor showed the transmittance of 84.1%, and haze of 3.56%. When the capacitive pressure sensor was pressed with the multiple 2 mm-diameter tips, it can well detect the force depending on the applied pressure. This indicated that the capacitive pressure sensor is a promising scheme for next generation flexible transparent touch screens which can provide multi-tasking capabilities through simultaneous multi-touch and multi-force sensing.

Study of the Characteristics of Hydrogen-Gas Filling Process of Ultra-Light Composite Tanks for Fuel-Cell Vehicles (연료전지자동차용 초경량 복합재료 탱크의 수소 충전 특성 연구)

  • Yoo, Gye-Hyoung;Kim, Jong-Lyul;Lee, Taek-Su;Lee, Joong-Hee
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.35 no.7
    • /
    • pp.813-819
    • /
    • 2011
  • In this research, we investigated the hydrogen-gas filling characteristics of ultra-light composite tanks that have a plastic or aluminum liner inside the composite shell. The study was performed for different gas and tank temperatures. The temperature changes at various positions in the Type-4 tank during hydrogen-gas filling were monitored in order to understand the effects of the filling conditions. The results were compared with those obtained for a Type-3 tank. As the filling speed was increased, a quicker temperature rise was observed, and the temperature distribution over the entire region showed significant discrepancies.

Enhancement of seed germination and microbial disinfection on ginseng by cold plasma treatment

  • Lee, Younmi;Lee, Young Yoon;Kim, Young Soo;Balaraju, Kotnala;Mok, Young Sun;Yoo, Suk Jae;Jeon, Yongho
    • Journal of Ginseng Research
    • /
    • v.45 no.4
    • /
    • pp.519-526
    • /
    • 2021
  • Background: This study aimed to investigate the effect of cold plasma treatment on the improvement of seed germination and surface sterilization of ginseng seeds. Methods: Dehisced ginseng (Panax ginseng) seeds were exposed to dielectric barrier discharge (DBD) plasma operated in argon (Ar) or an argon/oxygen mixture (Ar/O2), and the resulting germination and surface sterilization were compared with those of an untreated control group. Bacterial and fungal detection assays were performed for plasma-treated ginseng seeds after serial dilution of surface-washed suspensions. The microbial colonies (fungi and bacteria) were classified according to their phenotypical morphologies and identified by molecular analysis. Furthermore, the effect of cold plasma treatment on the in vitro antifungal activity and suppression of Cylindrocarpon destructans in 4-year-old ginseng root discs was investigated. Results: Seeds treated with plasma in Ar or Ar/O2 exhibited a higher germination rate (%) compared with the untreated controls. Furthermore, the plasma treatment exhibited bactericidal and fungicidal effects on the seed surface, and the latter effect was stronger than the former. In addition, plasma treatment exhibited in vitro antifungal activity against C. destructans and reduced the disease severity (%) of root rot in 4-year-old ginseng root discs. The results demonstrate the stimulatory effect of plasma treatment on seed germination, surface sterilization, and root rot disease suppression in ginseng. Conclusion: The results of this study indicate that the cold plasma treatment can suppress the microbial community on the seed surface root rot in ginseng.

Study Curation Service Utilizing th Learner Pattern Information from the Smart Learning (스마트러닝에서의 학습자 패턴 정보를 활용한 큐레이션 서비스 제공 방안 연구)

  • Yun, Jun-soo;Hwang, Hyun-seo;Park, Jin-tae;Seo, Kyoung-teak;Moon, Il-young;Kwon, Oh-young;Kim, Byeong-jun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2015.05a
    • /
    • pp.903-906
    • /
    • 2015
  • Over the recent industry -wide virtual world and the real world, broadcasting and telecommunications, IT technology and traditional industries, such as the fusion research has been conducted in a variety of fields. And training in the field of education is changing the paradigm of creativity to break the intrusive training center. In addition, the quality of interactive educational content technology to foster self-directed future talent is a situation that is required. The market has already surpassed the smartphone PC, smart devices and e-learning technologies are appearing new service called 'smart learning' as a new form of convergence of the educational system. In this paper, based on the direct development of a content authoring applications and Web sites, and cloud environments to the students collect and analyze patterns. Utilizing this information, we studied the curation service plans that recommend the appropriate content to fit the tastes of the learner.

  • PDF

Directions of Convergence Technology Education related to New Industry Field through Analysis of Industrial Needs (산업체 요구분석을 통한 신산업 융합기술교육의 방향)

  • Jin, Sung-Hee
    • Journal of the Korea Convergence Society
    • /
    • v.10 no.8
    • /
    • pp.105-113
    • /
    • 2019
  • Convergence education, which is operated by many engineering colleges, is mainly led by government-led projects. Convergence majors are established in consideration of the research field of the university professors rather than systematically analyzing the needs of the industry. The purpose of this study is to present the directions of convergence technology education related to new industry fields by analyzing industry needs. Participants were 299 industrial workers in various fields. Instrument consisted of three parts: necessity for convergence education, demand for convergence new technology education from industry perspective, and opinions about undergraduate convergence education. As a result, it was found that the level of awareness of industry needs for fusion technology education was high, and it was confirmed that there is a high demand for IoT convergence, bio-health, advanced new material, and renewable energy fields among convergence technology fields. In addition, the results of the industry demand for convergence new technology education were presented. The suggestions for expectations, problems, and improvements in undergraduate education were presented and implications for convergence technology education were discussed based on the results of the study.

Digilog-book: A Novel Concept of Media (새로운 개념의 미디어 디지로그북)

  • Kim, Hae-Sun;Woo, Woon-Tack
    • 한국HCI학회:학술대회논문집
    • /
    • 2009.02a
    • /
    • pp.1293-1300
    • /
    • 2009
  • The recent advent of the digital age changes socio-cultural environments. Since the value of technology is moving to the value of culture, new research areas which are the convergence of emotion, knowledge, and technology. These trends enlarge interactive digital multimedia in daily human life. One of them, book, also envolves new concept. Over electronic book, we present digilog book which is fusion of old-media and digital media. In this paper, we define digilog book as a new conceptual media and discuss it in details. Several digilog books are showed as an example and its authoring tool, ARtalet is introduced.

  • PDF

Educational Program Plan to Train The Multi Professional Person (멀티 플레이형 인재 양성을 위한 프로그램 구축)

  • Jeon, Young-Sun;Lee, Kyung-Hwa;Lee, Cheol-Hee;Seo, Tae-Won
    • Journal of Engineering Education Research
    • /
    • v.15 no.1
    • /
    • pp.26-31
    • /
    • 2012
  • The late industrial structures have been changed rapidly. Thus the educational institutes and businesses should be able to react with speed to the change of paradigm. The importance of talent who is taped and leads to epochal and social trend of change has been strongly emphasized. Recently with the phenomena of technical fusion and composition it is emphasized that the requested talent by an enterprise is the multi professional person who has the diverse professional technology and the ability of the solving problem. Changing a person who requires from an enterprise the upbringing goal of the educational institute undergo a great many changes. Thus analyzing the required talent by an enterprise, the purpose of this study is to suggest the educational program to train the multi professional person by the example of the operation of innovative engineering education program financially supported by Minister of Education, Science and Technology.

Development Brief of A Body Area Network for Ubiquitous Healthcare : An Introduction to Ubiquitous Biomedical Systems Development Center

  • Hong Joo-Hyun;Kim Nam-Jin;Cha Eun-Jong;Lee Tae-Soo
    • Journal of Biomedical Engineering Research
    • /
    • v.26 no.5
    • /
    • pp.331-335
    • /
    • 2005
  • The fusion technology of small sensor and wireless communication was followed by various application examples of the embedded system, where the social infrastructural facilities and ecological environment were wirelessly monitored. In addition, this technology represents the primary application area being extended into the healthcare field. In this study, a body area network for ubiquitous healthcare is presented. More specifically this represents a wireless biomedical signal acquisition device characterized by small size, low power consumption, pre-processing and archiving capability. Using this device, a new method for monitoring vital signs and activity is created. A PDA-based wireless sensor network enables patients to be monitored during their daily living, without any constraints. Therefore, the proposed method can be used to develop Activities of Daily Living (ADL) monitoring devices for the elderly or movement impaired people. A medical center would be able to remotely monitor the current state of elderly people and support first-aid in emergency cases. In addition, this method will reduce medical costs in society, where the average life expectancy is increasing.