Olfactory bulb MRI 검사 시 SPACE 3D T2 기법의 Turbo factor 변화에 따른 화질 평가에 관한 연구

이준규,노태관,조용근 한국방사선학회 2022 한국방사선학회 논문지 Vol.16 No.2

This study aims to find out the change in diagnostic capability and image quality compared to 2D TSE T2 after examination the Turbo Factor value of the SPACE 3D T2 technique during Olfactory Bulb examination. As a result of the study, qualitative and quantitative analysis, it was found that there was a statistically significant difference in the SPACE 3D T2 technique compared to the 2D TSE T2 technique, and the conclusion 본 연구는 후각망울(Olfactory Bulb) 검사 시 SPACE 3D T2 기법의 Turbo Factor 값을 변화하여 검사 한 후 2D TSE T2와 비교하여 진단능과 화질의 변화를 알아보고자 한다. 연구 결과 정성적, 정량적 분석 결과 SPACE 3D T2 기법이 2D TSE T2 기법과 비교 시 통계적으로 유의한 차이가 있음을 알 수 있었으며, 결론적으로 Turbo Factor값을 적절하게 변화 시킨 SPACE 3D T2 기법은 검사시간을 단축시키면서 2D TSE T2 기법과 비교하여 화질이 증가 된 영상을 획득할 수 있으므로 임상적으로 충분한 진단적 가치가 있다고 사료된다.

완전시차 집적 영상 배경을 가지는 2D-3D 겸용 디스플레이 시스템

홍석표,신동학,김은수,Hong, Suk-Pyo,Shin, Dong-Hak,Kim, Eun-Soo 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.2

본 논문에서는 완전 시차 배경 영상을 가지는 새로운 형태의 2D-3D 겸용 디스플레이 시스템을 제안한다. 제안하는 시스템의 집적 영상 시스템과 기존의 2D 평면 디스플레이 구성이 되며, 3D 모드와 2D 모드에서 구동이 가능하다. 3D 모드에서는 집적 영상 기술을 이용하여 배경영상을 만들어서 주요 영상과 결합함으로써 3D 영상을 만든다. 2D 모드에서는 집적영상 시스템이 2D 평면 디스플레이의 백라이트 역할을 수행하고 2D 평면 디스플레이에 2D 영상이 표시된다. 제안하는 방법의 유용함을 보이기 위해서 기초 실험을 수행하고 성공적인 실험 결과를 보고한다. In this paper, we propose a 2D-3D convertible display system having a background of full-parallax integral images. The proposed system is composed of integral imaging system and conventional 2D flat display and is able to operate either 3D mode or 2D mode. In 3D mode, the 3D image is generated by combining the 2D main image with the background image based on integral imaging. In 2D mode, the integral imaging system plays a role as the back-light of 2D flat display and then 2D image is observed through 2D flat display. To show the usefulness of the proposed system, we carry out the preliminary experiments and present the successful experimental results.

High-Performance MoS₂/CuO Nanosheet-on-One-Dimensional Heterojunction Photodetectors

Um, Doo-Seung,Lee, Youngsu,Lim, Seongdong,Park, Seungyoung,Lee, Hochan,Ko, Hyunhyub American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.49

<P>van der Waals heterostructures based on stacked two-dimensional (2D) materials provide novel device structures enabling high-performance electronic and optoelectronic devices. While 2D-2D or 2D bulk heterostructures have been largely explored for fundamental understanding and novel device applications, 2D one-dimensional (1D) heterostructures have been rarely studied because of the difficulty in achieving high-quality heterojunctions between 2D and 1D structures. In this study, we introduce nanosheet-on-1D van der Wags heterostructure photodetectors based on a wet-transfer printing of a MoS2 nanosheet on top of a CuO nanowire (NW). MoS2/CuO nanosheet-on-1D photodetectors show an excellent photocurrent rectification ratio with an ideality factor of 1.37, which indicates the formation of an atomically sharp interface and a high-quality heterojunction in the MoS2/CuO heterostructure by wet-transfer-enhanced van der Waals bonding. Furthermore, nanosheet-on-1D heterojunction photodetectors exhibit excellent photodetection capabilities with an ultrahigh photoresponsivity (similar to 157.6 A/W), a high rectification ratio (similar to 6000 at +/- 2 V), a low dark current (similar to 38 fA at -2 V), and a fast photoresponse time (similar to 34.6 and 51.9 ms of rise and decay time), which cannot be achievable with 1D-on-nanosheet heterojunction photodetectors. The wet transfer printing of nanosheet-on-1D heterostructures introduced in this study provides a robust platform for the fundamental study of various combinations of 2D-on-1D heterostructures and their applications in novel heterojunction devices.</P>

2D와 3D 영상 시청 후 나타난 사위도 및 자각증상의 변화

김동수,이욱진,김재도,유동식,정의태,손정식 한국안광학회 2012 한국안광학회지 Vol.17 No.2

Purpose: The changes of phoria and subjective asthenopia before and after viewing were compared based on 2D image and two ways of 3D images, and presented for references of 3D image watching and production. Methods: Change in phoria was measured before and after watching 2D image, 3D-FPR and 3D-SG images for 30 minutes with a target of 41 university students at 20-30 years old (male 26, female 15). Paired t-test and Pearson correlation between changed phoria and subjective symptoms which were measured using questionnaires were evaluated by before and after watching each images. Results: Right after watching 2D image, exophoria was increased by 0.5 Δ‚ in distance and near, but it was not a significant level. Right after watching 3D image,exophoria was increased by 1.0~1.5 Δ‚ and 1.5~2.0 Δ‚ in distance and near, respectively when compared with before watching. In the significant level, exophoria tended to increase. Changes in near was increased more by 0.5 Δ‚ compared with those in distance. Changes based on way of 3D-FPR and 3D-SG image were less than 0.5Δ‚ and there was almost no difference. In terms of visual subjective symptoms, eye strain was increased in 3D image compared with that in 2D image. In addition, there was no difference depending on way of image. In terms of Pearson correlation between phoria change and eye strain, as exophoria was increased, eye strain was increased. Conclusions: Watching 3D image increased eye strain compared with watching 2D image, and accordingly exophoria tended to increase. 목적: 2D 영상과 2가지의 방식의 3D 영상을 이용하여 시청 전·후의 사위도 변화와 자각적 안정피로를 비교하였고, 3D 영상 시청과 제작의 참고자료로 활용하고자 하였다. 방법: 20~30세의 대학생 41명(남 26명, 여 15명)을 대상으로 30분간 시청한 2D 영상, 3D-FPR과 3D-SG 영상의 시청 전후의 사위도와 자각증상을 측정하였다. 각 영상시청 전후에 측정한 사위도 변화와 설문조사로 얻은 자각증상 자료는 대응비교와 Pearson 상관관계로 분석하였다. 결과: 2D 영상 시청 직후의 원거리와 근거리에서 0.5 Δ 정도 외사위도가 증가하였지만 유의적 수준은 없었으며, 3D 영상 시청 직후에는 시청 전과 비교하여 원거리에서 1.0~1.5 Δ 정도, 근거리에서는 1.5~2.0 Δ 정도 유의적 수준에서 외사위도가 증가하는 경향을 보였으며, 원거리사위도보다 근거리사위도에서의 변화가 0.5 Δ 정도 더 많았다. 3DFPR과3D-SG 영상 방식에 따른 변화는 0.5 Δ 미만으로 차이는 없었다. 시각적 자각 증상에서도 2D 영상에 비해3D 영상에서 안정피로가 증가하였다. 3D 영상 방식에 따른 차이는 없는 것으로 나타났다. 사위도의 변화와 안정피로의 상관관계에서는 외사위로 증가할수록 안정피로가 증가하는 상관관계를 보였다. 결론: 3D 영상을 시청함에 따라서 안정피로가 증가되며, 이에 따라서 사위도의 변화에서는 외사위로 증가하는 경향을 보였다.

Multifunctional Two-Dimensional PtSe₂-Layer Kirigami Conductors with 2000% Stretchability and Metallic-to-Semiconducting Tunability

Okogbue, Emmanuel,Han, Sang Sub,Ko, Tae-Jun,Chung, Hee-Suk,Ma, Jinwoo,Shawkat, Mashiyat Sumaiya,Kim, Jung Han,Kim, Jong Hun,Ji, Eunji,Oh, Kyu Hwan,Zhai, Lei,Lee, Gwan-Hyoung,Jung, Yeonwoong American Chemical Society 2019 NANO LETTERS Vol.19 No.11

<P>Two-dimensional transition-metal dichalcogenide (2D TMD) layers are highly attractive for emerging stretchable and foldable electronics owing to their extremely small thickness coupled with extraordinary electrical and optical properties. Although intrinsically large strain limits are projected in them (i.e., several times greater than silicon), integrating 2D TMDs in their pristine forms does not realize superior mechanical tolerance greatly demanded in high-end stretchable and foldable devices of unconventional form factors. In this article, we report a versatile and rational strategy to convert 2D TMDs of limited mechanical tolerance to tailored 3D structures with extremely large mechanical stretchability accompanying well-preserved electrical integrity and modulated transport properties. We employed a concept of strain engineering inspired by an ancient paper-cutting art, known as kirigami patterning, and developed 2D TMD-based kirigami electrical conductors. Specifically, we directly integrated 2D platinum diselenide (2D PtSe<SUB>2</SUB>) layers of controlled carrier transport characteristics on mechanically flexible polyimide (PI) substrates by taking advantage of their low synthesis temperature. The metallic 2D PtSe<SUB>2</SUB>/PI kirigami patterns of optimized dimensions exhibit an extremely large stretchability of ∼2000% without compromising their intrinsic electrical conductance. They also present strain-tunable and reversible photoresponsiveness when interfaced with semiconducting carbon nanotubes (CNTs), benefiting from the formation of 2D PtSe<SUB>2</SUB>/CNT Schottky junctions. Moreover, kirigami field-effect transistors (FETs) employing semiconducting 2D PtSe<SUB>2</SUB> layers exhibit tunable gate responses coupled with mechanical stretching upon electrolyte gating. The exclusive role of the kirigami pattern parameters in the resulting mechanoelectrical responses was also verified by a finite-element modeling (FEM) simulation. These multifunctional 2D materials in unconventional yet tailored 3D forms are believed to offer vast opportunities for emerging electronics and optoelectronics.</P> [FIG OMISSION]</BR>

보건의료 대학생의 손가락 길이비(2D:4D)와 성역할 정체감

김금숙(Kim, Keum-Sook),조근자(Cho, Keun-Ja) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.5

집게손가락과 반지손가락의 길이비(2D:4D)는 모체 내에서 태아의 테스토스테론과 에스트로겐의 영향 수 준을 반영한다. 본 연구는 보건의료 대학생의 2D:4D와 성역할 정체감 유형을 파악하고 2D:4D와 성역할 정체감 사이의 관계를 파악하고자 시도되었다. 연구대상자는 보건의료 대학생 266명(남자 120명, 여자 146명)으로 성역할 정체감 설문(KSRI)에 응답한 후 복사기 를 이용하여 손가락길이가 측정되었다. 연구 결과, 보건의료 대학생들의 2D:4D는 남자 0.95, 여자 0.96으로 남녀 간에 유의한 차이가 있었으며(p<0.01), 성역할 정체감에 있어서는 남자는 양성성 유형(38.3%)이, 여자는 미분화 유형(35.6%)이 가장 많았다. 남녀사이에 남성성 점수는 유의한 차이가 있었으나(p<0.001), 여성성 점수는 유의한 차이가 없었고, 성역할 정체감 유형에 따 라서는 2D:4D에 차이가 없었다. 또한 남성성․여성성 점수에 따른 성역할 정체감과 2D:4D 사이의 상관관계는 남자 에서는 왼손의 손가락 길이비가 낮을수록 남성성 점수가 높았으며(r= -0.188, p<0.05), 여자에서는 유의한 상관관계 가 없었다. 결론적으로 보건의료 대학생 중에서도 여학생들에게 상황적인 변화에 더 잘 적응할 수 있도록 양성성 유형으로 나아갈 수 있는 중재 프로그램이 더욱 더 필요하다. 또한 본 연구에서는 2D:4D와 성역할 정체감과의 상관관계가 높게 나타나지는 않아 추후 한국인을 대상으로 한 더 많은 연구가 필요할 것으로 사료된다. The ratio of index finger length to ring finger length(2D:4D) is an index of prenatal testosterone and /or estrogen exposure. The aim of this study is to investigate digit ratio and the type of gender-role orientation, to identify the correlation between 2D:4D and gender-role orientation in health and medical students. Participants were 120 male and 146 female university students majoring in health or medicine. After filling in KSRI(Korean Sex Role Inventory), 2nd and 4th finger lengths were measured on both hands using vernier callipers with photocopy. This study showed 2D:4D in the males was 0.95, and that in the females was 0.96 (p<0.01). 38.3% male students revealed androgyny, on the other hand, 35.6% female students revealed undifferentiated type from KSRI. And also, there was a significant difference in masculinity score between male and female but not in feminity score. There was no significant difference in 2D:4D according gender role orientation. The KSRI masculinity score was negatively related to 2D:4D of left hand in male (p<0.05). The results of this study suggest that a more masculine gender role orientation in males is associated with low 2D:4D revealing higher testosterone and/or lower estrogen level in utero. However, more research in 2D:4D ratio to Korean is needed for support of this result.

3D영상에 정합되는 스테레오 오디오

박성욱(Sung-Wook Park),정태윤(Tae-Yun Chung) 한국지능시스템학회 2011 한국지능시스템학회논문지 Vol.21 No.2

본 연구에서는 동일한 내용의 영상을 2D로 감상할 때와 3D로 감상할 때 함께 재생되는 음향이 어떻게 달라져야하는지를 확인하는 주관적 실험을 수행하고 그 결과를 고찰하였다. 먼저 음향 정보는 음원이 자체적으로 제공하는 정보인 음원의 거리와 방위각(즉 위치) 그리고 음원의 환경 혹은 장면(scene)이 제공하는 정보인 공간감으로 분리가 가능하므로 이에 맞게 동일 내용의 2D/3D 영상이 음원의 위치 선정에 미치는 영향 평가 실험과 동일한 내용의 2D/3D 장면이 음향 공간감에 주는 영향 평가 실험을 수행하였다. 첫 번째 실험 결과 3D 영상을 감상하는 경우 2D 영상을 감상할 때 보다 스크린을 기준으로 음원의 거리와 방위각을 확대하여 인지한다는 결과를 얻을 수 있었다. 이는 2D 영상용 소리보다 거리와 방위각이 큰 3D 영상용 소리를 만들어야 한다는 것을 의미한다. 또한 3D 영상용 소리는 3D 영상뿐만 아니라 2D 영상과도 잘 어울린다는 결과를 얻었다. 두 번째 실험 결과, 3D 영상을 감상하는 경우 2D 영상을 감상할 때 보다 잔향이 더 많은 소리를 선호함을 알 수 있었다. 이는 3D 영상을 감상할 때 공간감이 강화되기 때문으로 해석된다. 본 연구의 결과는 기본적으로 2D 영상용 음향을 제작하던 음향엔지니어가 3D영상용 음향을 제작하는 데 활용할 수 있으며, 2D to 3D 음향을 자동으로 변형하는 연구의 기초가 될 것이다. 더 나아가서 본 연구의 결과를 기반으로 제한된 대역폭에서 2D 와 3D를 동시에 지원하는 방송 시스템을 설계하는데 적용해 본다면, 방송 데이터 규격은 스테레오 영상, 음원의 위치가 강조된 3D 음향과 공간감을 주는 잔향 정보로 구성하는 것이 적절하다고 할 수 있다. This paper presents subjective experimental results to understand how audio should be changed when a video clip is watched in 3D than 2D. This paper divided auditory perceptual information into two categories; distance and azimuth that a sound source contributes mostly, and spaciousness that scene or environment contribute mostly. According to the experiment for distance and azimuth ,i.e. sound localization, we found that distance and azimuth of sound sources were magnified when heard with 3D than 2D video. This lead us to conclude 3D sound for localization should be designed to have more distance and azimuth than 2D sound. Also we found 3D sound are preferred to be played with not only 3D video clip but also 2D video clip. According to the experiment for spaciousness, we found people prefer sound with more reverberation when they watch 3D video clips than 2D video clips. This can be understood that 3D video provides more spacial information than 2D video. Those subjective experimental results can help audio engineer familiar with 2D audio to create 3D audio, and be fundamental information of future research to make 2D to 3D audio conversion system. Furthermore when designing 3D broadcasting system with limited bandwidth and with 2D TV supportive, we propose to consider transmitting stereoscopic video, audio with enhanced localization, and metadata for TV sets to generate reverberation for spaciousness.

Horizontal-to-Vertical Transition of 2D Layer Orientation in Low-Temperature Chemical Vapor Deposition-Grown PtSe₂ and Its Influences on Electrical Properties and Device Applications

Han, Sang Sub,Kim, Jong Hun,Noh, Chanwoo,Kim, Jung Han,Ji, Eunji,Kwon, Junyoung,Yu, Seung Min,Ko, Tae-Jun,Okogbue, Emmanuel,Oh, Kyu Hwan,Chung, Hee-Suk,Jung, YounJoon,Lee, Gwan-Hyoung,Jung, Yeonwoong American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.14

<P>Two-dimensional (2D) transition-metal dichalcogenides (2D TMDs) in the form of MX<SUB>2</SUB> (M: transition metal, X: chalcogen) exhibit intrinsically anisotropic layered crystallinity wherein their material properties are determined by constituting M and X elements. 2D platinum diselenide (2D PtSe<SUB>2</SUB>) is a relatively unexplored class of 2D TMDs with noble-metal Pt as M, offering distinct advantages over conventional 2D TMDs such as higher carrier mobility and lower growth temperatures. Despite the projected promise, much of its fundamental structural and electrical properties and their interrelation have not been clarified, and so its full technological potential remains mostly unexplored. In this work, we investigate the structural evolution of large-area chemical vapor deposition (CVD)-grown 2D PtSe<SUB>2</SUB> layers of tailored morphology and clarify its influence on resulting electrical properties. Specifically, we unveil the coupled transition of structural-electrical properties in 2D PtSe<SUB>2</SUB> layers grown at a low temperature (i.e., 400 °C). The layer orientation of 2D PtSe<SUB>2</SUB> grown by the CVD selenization of seed Pt films exhibits horizontal-to-vertical transition with increasing Pt thickness. While vertically aligned 2D PtSe<SUB>2</SUB> layers present metallic transports, field-effect-transistor gate responses were observed with thin horizontally aligned 2D PtSe<SUB>2</SUB> layers prepared with Pt of small thickness. Density functional theory calculation identifies the electronic structures of 2D PtSe<SUB>2</SUB> layers undergoing the transition of horizontal-to-vertical layer orientation, further confirming the presence of this uniquely coupled structural-electrical transition. The advantage of low-temperature growth was further demonstrated by directly growing 2D PtSe<SUB>2</SUB> layers of controlled orientation on polyimide polymeric substrates and fabricating their Kirigami structures, further strengthening the application potential of this material. Discussions on the growth mechanism behind the horizontal-to-vertical 2D layer transition are also presented.</P> [FIG OMISSION]</BR>

Fruit Set and Yield Enhancement in Tomato (Lycopersicon esculentum Mill.) Using Gibberellic Acid and 2,4-Dichlorophenoxy Acetic Acid Spray

Binod Prasad Luitel,Taek Jong Lee,Won Hee Kang 한국생물환경조절학회 2015 시설원예‧식물공장 Vol.24 No.1

토마토의 착과와 수확량은 여름철 비닐하우스내 고온스트레스로 인하여 감소하게 된다. 본 연구는 여름철 화천지역에 위치한 비닐하우스에서 지베렐린(GA3)과 2,4-Dichlorophenoxy Acetic Acid(2,4-D) 처리가 토마토의 수확량, 착과율, 착과 후 과실품질에 미치는 영향을 알아보기 위해 ‘Adoration‘ 품종을 이용하여 실험하였다. GA3 0-, 5-, 10-, 15mg·L−1와 2,4-D 0-, 5-, 10mg·L−1를 개화 초기에 처리한 후 착과율, 수확량, 과실품질과 관련된 형질을 관찰한 결과, GA3 10mg·L−1처리구에서 대조구에 비해 14.2%의 착과율 증가를 보였다. GA3처리구에서는 수확량, 과중, 상품과실 수에 유의한 차이가 있었다. 2,4-D를 개화기에 처리했을 경우 착과율, 수확량, 상품과의 과중에 영향을 미쳤으며 GA3과 2,4-D를 각각 5mg·L−1 농도로 혼합처리 하였을 때 가장 높은(62.5%) 착과율을 나타내었다. 과실크기와 고형물함량은 GA3처리구에서만 유의성 있는 차이를 보였다. 따라서 여름철 비닐하우스의 고온조건에서 GA3 0mg·L−1처리구와 2,4-D 5mg·L−1를 처리했을 때 착과율이 가장 높아 많은 수확량을 기대할 수 있을 것으로 판단된다. High temperature stress in summer season at plastic house is a limiting factor for tomato fruit set and yield. This study was performed to assess the effects of gibberellic acid (GA3) and 2,4-Dichlophenoxy acetic acid (2,4-D) spray on fruit set, yield, and quality of tomato cv. ‘Adoration’(Enza Zaden Co., Ltd.) under the plastic house in Hwacheon, 2011. Four concentrations (0-, 5-, 10- and 15mg·L−1) of GA3, and three concentrations (0-, 5- and 10mg·L−1) 2,4-D were sprayed in early flowering of tomato in the plastic house, and fruit set, yield and quality characters were observed. The results showed that spray of 10mg·L−1 GA3 significantly increased the fruit set by 14.2% than unsprayed. The spray of GA3 significantly increased the marketable fruit number, fruit weight, and yield. The spray of 2,4-D on blossoms significantly affected the fruit set percentage, fruit weight, marketable fruit weight and yield, and the highest fruit set observed as 62.5% in combined spray of GA3 and 2,4-D at each 5mg·L−1. Fruit size and total soluble solids significantly varied with the concentrations of GA3 sprayed. The result indicates that the spray of 10mg·L−1 GA3 and 5mg·L−1 2,4-D can be more economic and effective to increase the fruit set, and yield in tomato under high temperature condition in plastic house.

유아의 심상회전능력에 포함된 성호르몬 지수 2D:4D의효과

김상윤 인지발달중재학회 2011 인지발달중재학회지 Vol.2 No.2

Much recent research has focused on 2D:4D(the ratio of the lengths of the second to fourth manual digits) as a predictor of the degree of expression of sexually dimorphic and other sex-hormone mediated traits. However, published findings are often contradictory or subject to various methodological problems. In the present study, the differences of MRT(Mental Rotation Ability) scores of young children between gender groups and between 2D:4D(left hand, right hand) groups were tested. As results, means of MRT scores showed no significant difference between for the gender groups and for the 2D:4D group of left hand. However, for the 2D:4D group of right hand, significant differences were founded. These results mean who influenced more testosterone hormone showed higher MRT score than others regardless their gender. The recent 2D:4D literature in light of these findings and their implications for sex differences in special education of young children were discussed. 최근에 많은 연구들이 2D:4D(약지 길이에 대한 검지 길이의 비율)를 성차 또는 성호르몬의 차이를 설명하는 특질이 될 수 있는지에 관심을 모으고 있다. 그러나 현재까지는 여러 연구들의 결과가 다르게 나오거나 서로 다른 연구방법상의 문제점들을 보이고 있다. 본 연구는 유아의 심상회전능력을 남녀의 집단 간 그리고 오른손과 왼손의2D:4D의 상하집단 간으로 구분하여 그 평균을 비교하였다. 연구 결과 유아들의심상회전능력은 남아와 여아 집단 간에 차이가 없었으며 왼쪽 손의 2D:4D 집단 간에서도 차이가 없었으나 오른쪽 손의 2D:4D 집단 간에는 유의한 차이가있었다. 즉, 오른쪽 손의 2D:4D에서 발견되는 지표에 따라 남성호르몬의 영향을 많이 받은 것으로 보이는 집단에서 그들의 성(性)과는 상관없이 심상회전능력이 더 우수하였다. 관련된 선행연구들과 함께 성호르몬의 차이에 따른 심상회전능력의 차이가 유아들의 수학과 관련된 공간교육이나 학업적성진단에 갖는함의들이 논의 되었다.