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Junpil Park,Sunho Choi,Seoung ho Baek,Sang-Hu Park,Yu-Hsi Huang,Jaesun Lee 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.6
3-Dimension (3D) printers are increasingly being used in high-tech industrial applications technology, because they can produce sophisticated products by laminating materials with less time and cost compared to cutting processing, such as conventional machine tools. However, since the reliability evaluation criteria and method for laminated manufacturing products are not clear, accidents cannot be prevented when 3D printed laminates are used as structures and machined parts. In this paper, ultrasonic wave propagation characteristics were evaluated on the specimens manufactured by laminating acrylonitrile butadiene styrene resin materials with a stereo lithography apparatus 3D printer using the ultrasonic inspection method among non-destructive techniques. Specimens were laminated in units of 0.1 mm, and thicknesses of 1, 2, 4, 6 and 8 mm were applied as variables. In addition, the ultrasonic characteristics according to laminating direction were analyzed by laminating diagonally and vertically, including laminating in the horizontal direction, and defect specimens were produced to check whether defects were read. It was found that the ultrasonic velocity of the horizontally laminated specimen having a thickness of less than 4 mm was slower than the ultrasonic reference velocity, and that the ultrasonic velocity was affected according to the laminated direction. In addition, by arranging the defect location of the specimen differently, it was determined whether the defect was detected, and whether it was possible to check the location. Based on the results of this study, it will be possible to broadly apply this technique to advanced industrial technologies through evaluation of the condition and reliability of laminated manufacturing products manufactured with 3D printers.
Guided-Wave Tomographic Imaging of Plate Defects by Laser-Based Ultrasonic Techniques
Junpil Park,Juyoung Lim,Younho Cho 한국비파괴검사학회 2014 한국비파괴검사학회지 Vol.34 No.6
Contact-guided-wave tests are impractical for investigating specimens with limited accessibility and rough surfaces or complex geometric features. A non-contact setup with a laser-ultrasonic transmitter and receiver is quite attractive for guided-wave inspection. In the present work, we developed a non-contact guided-wave tomography technique using the laser-ultrasonic technique in a plate. A method for Lamb-wave generation and detection in an aluminum plate with a pulsed laser-ultrasonic transmitter and Michelson-interferometer receiver was developed. The defect shape and area in the images obtained using laser scanning, showed good agreement with the actual defect. The proposed approach can be used as a non-contact online inspection and monitoring technique.
Guided-Wave Tomographic Imaging of Plate Defects by Laser-Based Ultrasonic Techniques
Park, Junpil,Lim, Juyoung,Cho, Younho The Korean Society for Nondestructive Testing 2014 한국비파괴검사학회지 Vol.34 No.6
Contact-guided-wave tests are impractical for investigating specimens with limited accessibility and rough surfaces or complex geometric features. A non-contact setup with a laser-ultrasonic transmitter and receiver is quite attractive for guided-wave inspection. In the present work, we developed a non-contact guided-wave tomography technique using the laser-ultrasonic technique in a plate. A method for Lamb-wave generation and detection in an aluminum plate with a pulsed laser-ultrasonic transmitter and Michelson-interferometer receiver was developed. The defect shape and area in the images obtained using laser scanning, showed good agreement with the actual defect. The proposed approach can be used as a non-contact online inspection and monitoring technique.
김준필(Junpil Kim),차재민(Jae-Min Cha),홍대근(Daegeun Hong),서석환(Suk-Hwan Suh) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2
The application types of systems engineering can be classified into precedented and unprecedented system design. Particularly, in the cases of precedented system design, it is achievable to save development time and cost through utilizing reference data related to the precedented system as system initial specifications. By reverse engineering process based on systems engineering, the sources can be restructured and utilized as reference data to perform the precedented system design effectively. In this paper, a reference model for system initial specification deduction is proposed, which has high usability and makes the completeness of reference data better through improving the existing reverse engineering processes based on systems engineering, also applicability of the reference model is reviewed by case study.
다양한 상황 데이터 처리를 위한 통합 인터페이스 설계 및 구현
부준필(Junpil Boo),고민정(Minjung Ko),정주영(Juyoung Jung),김도현(Dohyun Kim),이상준(Sangjun Lee) 한국멀티미디어학회 2008 한국멀티미디어학회 학술발표논문집 Vol.2008 No.2
유비쿼터스 기반의 지능형 서비스를 제공하기 위하여 센서 네트워크, RFID, GPS 등의 이기종 하드웨어와 더불어 다양한 상황 데이터를 처리하기 위한 미들웨어에 대한 연구가 필요하다. 이에 본 논문에서는 다양한 이기종 하드웨어에서 수집된 다양한 상황 데이터를 처리하는 방안을 제시한다. 더불어 제시된 데이터 처리 방안에 따라 다양한 이기종 하드웨어로부터 수집된 상황 데이터를 수신하여 파싱, 큐잉, 분류, 통합 프레임 생성 등의 데이터 처리 기능을 수행하는 In-network 미들웨어의 기능을 수행하는 통합 인터페이스를 설계하고 구현한다. 이를 통하여 처리되는 상황 데이터를 효과적으로 처리하는 것을 확인하며, 향후 다양한 상황 데이터를 처리하는 인터페이스를 개발함으로써 다양한 지능형 응용 서비스를 제공할 수 있을 것으로 사료된다.
Jang, JunPil,Na, MinKyun,Thuong, Phuong Thien,Njamen, Dieudonné,Mbafor, Joseph Tanyi,Fomum, Zacharias Tanee,Woo, Eun-Rhan,Oh, Won Keun The Pharmaceutical Society of Japan 2008 Chemical & pharmaceutical bulletin Vol.56 No.1
<P>Phytochemical study on an EtOAc-soluble extract of the root bark of <I>Erythrina mildbraedii</I> resulted in the isolation of six prenylated flavonoids 1—6. Based on physicochemical and spectroscopic analyses, their structures were determined to be new natural products licoflavanone-4′-<I>O</I>-methyl ether (1), 2′,7-dihydroxy-4′-methoxy-5′-(3-methylbut-2-enyl)isoflavone (2), and (3<I>R</I>)-2′,7-dihydroxy-3′-(3-methylbut-2-enyl)-2‴,2‴-dimethylpyrano[5‴,6‴ :4′,5′]isoflavan (3), along with three known compounds erythrinin B (4), abyssinin II (5), and parvisoflavone B (6). All the isolates, except for compound 4, inhibited PTP1B activity <I>in vitro</I> with IC<SUB>50</SUB> values ranging from 5.3 to 42.6 μ<SMALL>M</SMALL>. This result further suggests that the prenyl group on the B ring of flavonoids plays an important role in suppressing the enzyme PTP1B.</P>
조선후기 문인 사회의 인정 욕망과 타자(성): 燕巖 朴趾源과 그 주변을 중심으로
류준필(Ryu, Junpil) 국문학회 2008 국문학연구 Vol.17 No.-
The Unique and evident value of the self, for its guarantee, needs the presupposition that it is independent on the authority or the judgement of the outside world. How does it possible? How can one s value be butressed and certified when the exterior guarantee is meaningless? Pak Chi-Wŏn focused on the difference itself. Difference is the position which cannot be distributed to the specified spaces. By allowing the difference as a unlocated position, Pak Chi-Wŏn opens the possibility of the self without other authorities. Otherness is located right inside the self. There can be no difference between self and other. Pak Chi-Wŏn s concept of self and other implies the criticism toward the isolation of self or the authority oriented self. The state of madness狂 or absorbtion忘 can be the passage for otherness in the self and the ethical question for the recognition desire. He wanted to question the self identity of self, not to strenthen it by metaphysical strategies.
류준필(Ryu Junpil) 고려대학교 아세아문제연구소 2011 亞細亞硏究 Vol.54 No.4
A term of ‘修辭’, which is now generally identified with English concept ‘rhetoric’, was a traditional but newly reinvented in the early modern period. ‘修辭’ has been intertwined with the implication of ‘文’, and has marked a wide range of communication itself. ‘修辭’ had to experience a modernization or occidentalization as much as ‘文’ had to endure, and the result was the resettlement of ‘修辭’ as an equivalent of ‘rhetoric’. A Chinese scholar Zhang Tai-Yan[章太炎], although he was one of prominent leader of intellectual reform himself, has challenged to such a transformation of ‘修辭’ and ‘文’. He argued that new terminology of ‘修辭’ was reduced to the figure of language, then lost the philosophical relationship with a world view in general. ‘修辭’ still conveys the trace of the uncomfortable fusion of communication itself and its figurative strategies.