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.

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.

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.

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.

승용차 디스크 브레이크 패드용 전자시스템의 열 실험

이영진(Youngjin Lee),김정민(Jeongmin Kim),안태창(Taechang An) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11

EURONCAP 신 상부다리 평가 시험방법의 실험적 고찰

이영진(Youngjin Lee),박진섭(Jinseop Park),김시우(Siwoo Kim),강병도(Byungdo Kang),용부중(Boojoong Yong) 한국자동차공학회 2017 한국 자동차공학회논문집 Vol.25 No.1

연기(Pratītyasamutpāda)=공성(Śūny atā)=중도(Madhyamā pratipat) : ‘공’사상의 정당성 확보를 위한 나가르주나와 초기대승불교도의 노력

이영진(Lee, Youngjin) 불교학연구회 2019 불교학연구 Vol.60 No.-

나가르주나[龍樹]는 그의 저서인 ≷근본중송≸(Mūlamadhyamakakārikā)의 24장 18번째 게송에서 “연기(緣起 Pratītyasamutpāda)=공성(空性 Śūnyatā)=중도(中道 Madhyamā pratipat)” 를 주창한다. 그는 또한 귀경게에서 붓다가 ‘연기’를 설하셨다고 하며, 이 ‘연기’의 수식 어는 대승불교경전에서 ‘공성’을 지칭하거나 이와 연관된 여덟 가지 부정어[八不]이다. 따라서 나가르주나 사상의 핵심에는 ‘연기’를 붓다의 가르침(buddhavacana 佛說)으로 보고, 이를 ‘공성’으로 정의 혹은 치환하는 ‘연기=공성’의 등식이 놓여있다고 볼 수 있다. 그렇지만 사상사 혹은 문헌비평을 통한 문헌학적인 조사에 의하면, 대승불교문헌 가운데 가장 빠른 내용을 보존하고 있는 ≷팔천송반야경≸ 제 1장에는 ‘연기=공성’ 나아가, ‘연기=중도’, ‘공성=중도’가 언급되지 않을 뿐 아니라, ‘공성’(śūnyatā)이라는 용어조차도 등장하지 않는다. 따라서 적어도 초기 대승불교 경전의 최고층(最古層)에는 ‘연기’와 ‘공성’은 상호 연결점을 가지고 있지 않은 상호 독립적인 개념임이 분명하다. 본 논문에서는 ≷반야경≸과 ≷십지경≸이라는 초기대승불교문헌에 보이는 상호 무관한 ‘12지 연기’와 ‘공성’사상을 결합하고자 했던 시도를 조사함을 통해서, 나가르주나의 “연기=공성”이라는 선언은 ≷반야경≸ 등의 초기대승불교경전의 편집자들과 마찬가지로 주류불교에서 ‘법성’(法性 dharmatā)으로 간주해온 ‘12지 연기’라는 매개체를 통해 대승불교의 ‘공’사상에 정당성 즉 ‘불설’의 지위를 부여하고자 하는 시도라는 점을 강조하고자 한다. Nāgārjuna (c. 150~c. 250 CE) declares in the 24th chapter of the Mūlamadhyamakakārikā that dependent origination (zūnyatā) is identical with emptiness and the emptiness also denotes the middle path (madhyamā pratipat). Moreover, he maintains in the maṅgala verses of the text that the Buddha himself taught the doctrine of dependent origination, of which eight modifiers refer to or relate to the emptiness presented in Mahāyāna texts. In this regard, an equation of dependent origination=emptiness lies at the core of Nāgārjuna’s doctrine presented in his masterpiece. However, modern philological studies show that the first chapter of the Aṣṭāsāhasrikā Prajñāpāramitā, the earliest stratum of Mahāyāna texts, mentions neither the equation nor the term ‘emptiness’ itself. Therefore, it is probable to deem that Nāgārjuna has replaced dependent origination, generally acknowledged as the Word of the Buddha (buddhavacana), with emptiness for giving authenticity to the newly invented tenet. This paper aims to unveil that not only Nāgārjuna but also editors of the early Mahāyāna sūtras like the Daśabhūmika sūtra and Prajñāpāramitās have endeavored to provide the title of ‘Word of the Buddha’ to the emptiness. It has been done by interpreting the twelve links of dependent origination accepted as the nature of things (dharmatā) by traditional Buddhists, with emptiness (=nonexistence) regarded as the nature of things by Mahāyānists who followed and adopted the Prajñāpāramitā system.