가축분뇨 Biochar의 물리·화학적 특성분석을 통한 흡착제 적용성 평가 연구

이영진,오민아,박경주,이재영,Lee, Youngjin,Oh, Minah,Park, Kyoungjoo,Lee, Jai-young 한국지하수토양환경학회 2017 지하수토양환경 Vol.22 No.2

As livestock husbandry has broadened from family-scale to enterprise-scale, the number of farming families has decreased in contrast to the increase of the number of livestock, and the amount of livestock manure discharged per household has increased. Livestock manure is difficult to handle and its disposal in the ocean is prohibited. Moreover, facilities that compost and liquefy manure are blamed as sources of soil, ground water, and surface water pollution because the amount of manure generated from husbandry farms causes eutrophication. In this study, livestock manure was utilized as a feedstock of hydrothermal carbonization (HTC) process to produce biochar for use as an environmental medium. The biochar was tested for iodine adsorption capability and its performance was compared with other adsorbent materials.

원통 봉을 적용한 압전 캔틸레버의 성능 향상

이영진,김세기,김영득,Lee, Youngjin,Kim, Seiki,Kim, Young-Deuk 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.5

This paper describes the development of a new piezoelectric unimorph cantilever structure intended to improve electrical output power, compared to a conventional cantilever. The proposed structure employs a cylindrical bar attached to one side of a steel plate, which is a significant factor in forced vibration mode. The feasibility of the proposed methodology was assessed experimentally and theoretically. The influence of three different types of bar material (i.e., stainless steel, silicon rubber, and urethane), and bar position, on the output voltage were examined and compared with those without the bar. The optimal position and material for the bar were identified through experimental and theoretical analyses. It appears that the electrical output power of the proposed cantilever is about 40% higher than that of a conventional unimorph cantilever.

수중 TCE 분해용 압전 초음파 트랜스듀서 개발

이영진,Lee, Youngjin 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.11

This paper describes the development of a piezoelectric flextensional transducer, which aims to effectively degrade the TCE contained in aqueous solution. In order to adjust the 1st flextensional resonant frequency and output displacement of the flextensional transducer, the effect of the geometrical variations on performance was analyzed using the finite element analysis (FEM). The results indicated that the effect of external shell's thickness and curvature were most significant, and experimental fabrication and characterization of a transducer was performed to confirm the results. To prove the capacity to degrade the TCE contained in aqueous solution, 50 and 100 ppm of TCE were prepared in sealed chamber, and investigated the removal rate of TCE through the time and initial concentration.

에어셀을 이용한 손목 재활훈련 장치

이영진,정유진,구교인,지영준,Lee, Youngjin,Jeong, Yujin,Koo, Kyo-In,Chee, Youngjoon 대한의용생체공학회 2015 의공학회지 Vol.36 No.2

In this paper, we propose a wrist rehabilitation training device using pneumatic inflation and deflation of air cells. By alternating inflation and deflation of upper and lower air cells, the device makes the flexional and extensional movement for wrist rehabilitation. With the angular displacement sensor, it measures the flexion-extension angle of the wrist during the training and the bending angle is used for the automatic control of the device. Using the sensor output, the regression equation was obtained to measure the bending angle of the wrist from a wrist rehabilitation training device. The measurement error of the device was evaluated by comparing the measurement output with the angle from the photograph. The measurement error of wrist bending angle between the sensor and photo was $3.2^{\circ}$ in average. With additional test and improvement, the pneumatic wrist rehabilitation training device might be used for rehabilitation training.

재난에 대한 인식이 정부신뢰에 미치는 영향

이영진,Lee, Youngjin 한국방재안전학회 2020 한국방재안전학회 논문집 Vol.13 No.4

본 연구는 한국인의 사회재난에 대한 위험인식 수준이 정부에 대한 신뢰에 미치는 영향을 알아보고자 하였다. 이를 위해 사회재난 유형에 따른 재난위험 인식 수준 차이와 사회재난 위험인식 수준이 정부신뢰에 미치는 영향을 분석하였다. 예비조사에서 위험성 정도가 높은 3개 사회재난 유형(조류독감, 미세먼지, 핵발전소)을 추출하였으며, 본 조사는 20세 이상 한국인 성인 남녀 1,109명을 대상으로 실시하였다. 분석결과, 첫째, 사회재난 인식 수준은 사회재난 유형에 따라 차이가 있는 것으로 나타났다. 둘째, 사회재난에 대한 자발성, 개인적 지식, 친숙도, 심각성, 두려움, 회복가능성 위험은 정부신뢰에 영향을 미치지 않는 것으로 나타났다. 셋째, 사회재난에 대한 지연성 위험 인식은 정부신뢰에 긍정적인 영향을 미치는 것으로 나타났다. 넷째, 사회재난에 대한 과학적 지식, 통제가능성, 치명성, 발현시기 위험 인식은 정부신뢰에 부정적인 영향을 미치는 것으로 나타났다. 결론에서는 본 연구의 시사점 및 한계점을 서술하였다. This study aimed to investigate the effects of social disaster risk perception levels of Koreans on government trust. To this end, differences in disaster risk perception levels based on social disaster types and the effects of social disaster risk perception levels on government trust were analyzed. In the preliminary survey, three types of social disasters with high risk levels (bird flu, fine dust, and nuclear power plants) were selected. The survey was conducted on 1,109 Korean men and women aged 20 years and older. First, the analysis results demonstrated that social disaster perception levels differed based on social disaster types. Second, the results showed that, in terms of social disasters, proactivity, personal knowledge, familiarity, severity, fear, and risk associated with chances of recovery did not affect government trust. Third, the perception of delayed social disaster risk had a positive effect on government trust. Fourth, scientific knowledge about social disasters, control capabilities, lethality, and risk perception at the onset time had a negative effect on government trust. In conclusion, the implications and limitations of this study were discussed.

Investigation to design of ultra-high-resolution parallel-hole collimator with CdTe photon counting detector

Youngjin Lee(이영진),Hee-Joung Kim(김희중),Yong-Gu Lee(이용구),Haenghwa Lee(이행화),Sunghoon Choi(최성훈),Byungdu Jo(조병두),Jong Seok Kim(김종석),Se Young Bae(배세영),Mi Hee Lee(이미희),Se Hee Han(한세희) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6

간 초음파 영상에서의 스페클 노이즈 제거를 위한 필터들의 비교 평가

김하진(Hajin Kim),이영진(Youngjin Lee) 대한방사선과학회(구 대한방사선기술학회) 2023 방사선기술과학 Vol.46 No.6

This study aimed to compare filters for reducing speckle noise in ultrasound images using clinical liver images. We acquired the clinical liver ultrasound images, and noisy images were obtained by adding 0.01, 0.05, 0.10, and 0.50 intensity levels of speckle noise to the liver images. The Wiener filter, median modified Wiener filter, gamma filter, and Lee filter were designed for the noisy images by setting window sizes at 3×3, 5×5, and 7×7. The coefficient of variation (COV) and contrast to noise ratio (CNR) were calculated to evaluate noise reduction and various filters. Moreover, the fil- ter with the highest image quality was selected and quantitatively compared to a noisy image. As a result, COV and CNR showed the noise improved result when the Lee filter was applied. Furthermore, the Lee filter image with a window size of 7×7 was noted to possess approximately a minimum of 1.28 to a maximum of 3.38 times better COV and a minimum of 2.18 to a maximum of 5.50 times better CNR than the noisy image. In conclusion, we confirmed that the Lee filter was effective in reducing speckle noise and proved that an appropriate window size needs to be set considering blurring.

정확한 품질 관리를 위한 비지역적 평균 노이즈 제거 approach 기반 초음파 영상의 화질 개선

이영진(Youngjin Lee),김규석(Kyuseok Kim) 대한초음파의료영상학회 2022 대한초음파의료영상학회 학술대회 초록집 Vol.6 No.1

흉부 디지털 단층영상합성 시스템 기반 Total Variation (TV) 노이즈 감소 알고리즘 적용

이영진(Youngjin Lee),강성현(Seong-Hyeon Kang),박성진(Seong Jin Park),최혜란(Hye Ran Choi),한수린(Su Rin Han),이성택(Sung Taek Lee) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.11

『십지경』 「서품」의 게송: 7세기 산스크리트 사본을 통한 교정과 제안

이영진 ( Lee Youngjin ) 인도철학회 2017 印度哲學 Vol.0 No.50

『십지경』 「서품」에는 다른 대승경전과 동일하게, 스스로에게 불설(佛說)의 권위를 부여하기 위한 무대장치가 존재한다. 이 장치는 다른 대승경전들에서 찾아보기 어려운 다중의 `범천권청`과 유사한 구조로 이루어져 있는데, 특히 핵심이 되는 부분은 다양한 운율을 사용하여 아름다운 게송으로 노래하고 있다. 라더(Rahlder)와 콘도(Kondo)는 18세기 이후의 후대 네팔사본을 기반으로 1926년과 1936년 각각 『십지경』 산스크리트 편집본을 출판하였는데, 이 편집본의 서품에는 관련 게송이 총 33개가 있다. 이 게송들은 불교에서 일반적으로 가장 많이 접하는 아누쉬뚭 운율 이외에도 아리야군(群)의 운율과 라또드핫타 운율을 비롯한 매우 다양한 운율로 이루어져 있다. 본 논문은 1996년 마쓰다 카즈노부(松田 和信)가 전 세계 학회에 보고한, 산스크리트 자료로는 가장 빠른 시기인 7세기에 후기 굽타 문자로 필사된 사본을 기반으로 이 게송들을 연구한 결과이다. 이 사본은 다른 자료들과는 달리 각 단계(地)가 시작 게송과 산문의 요약 게송 없이 산문으로만 구성된 특징을 지니고 있지만, 서품에서는 기존 편집본들과 동일하게 33게송이 존재한다. 논문에서 필자는 이 오래된 산스크리트 사본의 읽기를 통해 기존 편집본을 개선하거나 더 나은 읽기를 제안하는 몇몇 예들을 제시하였다. 이를 통하여 7세기 북부 인도에서 전승되던 『십지경』의 이해를 재구성하기 위한 발판을 만들고자 하였다. In the first section, or so called “nid anaparivarta,” of the dasabhumikasutra, like other Mah ay anic scriptures, there is a story that gives authority to the scripture itself as the word of the Buddha (buddhavacana). This story is made up of repeated requests for Vajragarbha to explain the ten stages of Bodhisattvas in detail, which remind us of the “encouragement from Brahm a” (梵天勸請), and his final acceptance of the requests after having been empowered by Buddhas to teach the stages. The story is featured in the fact that the highlights are sang in verses. Rahder and Kondo published Sanskrit editions of the text in 1926 and 1936, respectively, based on later Nepalese manuscripts from the 18th century onwards. Both of the editions include all the thirty three verses composed in various metres such as anustubh, ary a, rathoddhat a, indravajr a, indravamsa and so on. We have known that there remains a Sanskrit manuscript written in the post-Gupta script in no later than the seventh century. This manuscript, which is yet to be studied and the earliest available Sanskrit material up to now, has same number of stanzas as the former editions. Even though some parts of the verses are damaged or missing, consulting the manuscript, we can correct readings of the former editions, or suggest to read differently than the former editors did. In this paper, consulting the manuscript, I have shown some examples that can correct words of former editions that are not written in metre and caused by wrong Sanskritization such as `santu` to `santa(s).` In addition to this, I, adopting readings of the manuscript, suggest to read some verses differently. Some of these cases are supported by the Tibetan translation, Chinese translations, and/or the commentary on the dasabhumikasutra, titled dasabhumikavy akhy ana. But in other cases, the manuscript has its unique readings that would be hardly attested in other materials. I believe this unique readings can show the understanding of the verses circulated in norther India in the seventh century.