Korean Journal of Optics and Photonics最新文献

英文中文

The gap between perceived mental health needs and actual service utilization in Australian adolescents. 澳大利亚青少年心理健康需求认知与实际服务利用之间的差距。

IF 3.8 Q4 OPTICS

Korean Journal of Optics and Photonics

Pub Date : 2022-03-31 DOI: 10.1038/s41598-022-09352-0

Md Irteja Islam, Fakir Md Yunus, Samia Naz Isha, Enamul Kabir, Rasheda Khanam, Alexandra Martiniuk

Despite being highly prevalent, adolescent mental health problems are undertreated. To better understand the mental health treatment gap, we assessed the prevalence and correlates of help-seeking, including perceived need for care and access to that care. Data were drawn from Young Minds Matter (YMM) survey-the second Australian child and adolescents survey of mental health and wellbeing. Parent-reported data and self-reported child data were combined into one dataset to analyse 2464 Australian adolescents aged 13-17 years. We employed bivariate and multivariate logistic regression models to assess the correlation between independent variables (professionally assessed with mental disorders only, self-reported self-harm/suicidality only and both) and their distribution over outcome variables (perceived need and service use). Mental disorders include depression, anxiety, ADHD and conduct disorder. Our study revealed 15.0%, 4.6% and 7.7% had professionally assessed with mental disorders only, self-reported self-harm/suicidality only and both, respectively. Overall, 47.4% and 27.5% of adolescents respectively perceived need for care and used services in the past-12-months. While among those only who perceived the need, only 53% of adolescents used any services. Professionally assessed with mental disorders only, self-reported self-harm/suicidality only and both were associated with higher likelihood of perceived need and service use (p < 0.001 for all). However, adolescents who self-reported self-harm/suicidality only were not found to be significantly associated with service use among those who perceived the need for care. Adolescents who perceived the need for mental health care but did not seek care represent a treatment gap. Our results suggest the importance of reducing the wide treatment gap that exists between need and care.

尽管青少年心理健康问题的发病率很高，但却没有得到足够的治疗。为了更好地了解心理健康治疗方面的差距，我们评估了寻求帮助的普遍程度和相关因素，包括对治疗需求的感知和获得治疗的途径。数据来源于Young Minds Matter（YMM）调查--澳大利亚第二次儿童和青少年心理健康和幸福感调查。父母报告的数据和儿童自我报告的数据合并为一个数据集，对2464名13-17岁的澳大利亚青少年进行了分析。我们采用了二元和多元逻辑回归模型来评估自变量（仅专业评估为精神障碍、仅自我报告为自残/自杀以及两者皆有）与结果变量（感知需求和服务使用）之间的相关性。精神障碍包括抑郁症、焦虑症、多动症和品行障碍。我们的研究显示，分别有 15.0%、4.6% 和 7.7%的人只接受过精神障碍专业评估、只接受过自述自残/自杀以及两者都接受过专业评估。总体而言，分别有 47.4%和 27.5%的青少年在过去 12 个月中认为自己需要护理并使用过服务。而在认为有需要的青少年中，只有 53% 的青少年使用过任何服务。仅接受精神障碍专业评估的青少年、仅自我报告有自残/自杀倾向的青少年以及两者都接受精神障碍专业评估的青少年，其认为需要护理和使用服务的可能性都较高（P＜0.05）。

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引用次数: 0

3-channel Tiled-aperture Coherent-beam-combining System Based on Target-in-the-loop Monitoring and SPGD Algorithm 基于环内目标监测和SPGD算法的3通道平铺孔径相干波束组合系统

IF 0.1

Korean Journal of Optics and Photonics

Pub Date : 2021-01-01 DOI: 10.3807/KJOP.2021.32.1.001

Youngchan Kim, Y. Yun, Hansol Kim, HanByul Chang, Jaedeok Park, Yunjin Choe, Jeongkyun Na, Joohan Yi, Hyungu Kang, M. Yeo, Kyuhong Choi, Y. Noh, Y. Jeong, Hyuk-Jae Lee, Bong-Ahn Yu, D. Yeom, C. Jun

3-channel Tiled-aperture Coherent-beam-combining System Based on Target-in-the-loop Monitoring and SPGD Algorithm Youngchan Kim, Youngsun Yun, Hansol Kim, Hanbyul Chang, Jaedeok Park, Yunjin Choe, Jeongkyun Na, Joohan Yi, Hyungu Kang, Minsu Yeo, Kyuhong Choi, Young-Chul Noh, Yoonchan Jeong, Hyuk-Jae Lee, Bong-Ahn Yu, Dong-Il Yeom, and Changsu Jun Advanced Photonics Research Institute, GIST, 123, Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Korea Department of Electrical and Computer Engineering, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul 08826, Korea ISRC, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul 08826, Korea Department of Energy Systems Research, Ajou University, 206, World cup-ro, Yeongtong-gu, Suwon 16499, Korea Department of Physics, Ajou University, 206, World cup-ro, Yeongtong-gu, Suwon 16499, Korea

基于环内目标监测和SPGD算法的3通道光栅孔径相干波束组合系统金永灿，尹永善，金汉松，张汉烈，朴宰德，崔允珍，罗正均，易珠韩，姜铉古，吕敏秀，崔景洪，卢永哲，郑允灿，李赫宰，余奉安，廉东日，全昌秀首尔国立大学，首尔冠岳区冠岳路1号，首尔冠岳区冠岳路1号，首尔国立大学，韩国ISRC，首尔冠岳区冠岳路1号，首尔冠岳区冠岳路1号，韩国亚洲大学能源系统研究专业，206，世界杯足球赛，水原永通区16499，韩国亚洲大学物理学系，206，世界杯足球赛，水原永通区16499，韩国

引用次数: 0

Optimization of the Optical System for an Aircraft Warning Light Using a Fresnel Lens 飞机警示灯菲涅耳透镜光学系统的优化

IF 0.1

Korean Journal of Optics and Photonics

Pub Date : 2021-01-01 DOI: 10.3807/KJOP.2021.32.1.015

Jong-Tae Kim, Hyeongyeol Park

引用次数: 0

Linearly Polarized 1-kW 20/400-㎛ Yb-doped Fiber Laser with 10-GHz Linewidth 线偏振1kw 20/400- um掺镱光纤激光器，线宽10ghz

IF 0.1 Q4 OPTICS

Korean Journal of Optics and Photonics

Pub Date : 2021-01-01 DOI: 10.3807/KJOP.2021.32.3.120

Y. Jung, M. Jung, Kangin Lee, Taewoong Kim, Jae-Ihn Kim, Yongsoo Lee, J. Cho

引用次数: 0

A Study on Performance and Sensitivity Improvement of an Off-axis TMA Telescope Optical System by Changing the Aperture-stop Position 通过改变光圈位置提高离轴TMA望远镜光学系统性能和灵敏度的研究

IF 0.1

Korean Journal of Optics and Photonics

Pub Date : 2021-01-01 DOI: 10.3807/KJOP.2021.32.1.009

Han-Yul Lee, Won-Kyoun Jun, Sang Min Lee, Ki-hwan Kim, Hyungil Seo, S. Park, M. Jung

引用次数: 0

A Study of the Design of Automotive Communication Lamps Using Microlens Arrays 基于微透镜阵列的汽车通信灯设计研究

IF 0.1 Q4 OPTICS

Korean Journal of Optics and Photonics

Pub Date : 2021-01-01 DOI: 10.3807/KJOP.2021.32.3.101

Jae-Yeong Seo, Hyun-Hwa Lee, Michael Kong, Hwan-young Choi, M. Jung

In this paper, a study of the design of automotive communication lamps using microlens arrays (MLAs) was conducted. With the development of autonomous driving technology, automobiles need communication lamps to communicate with pedestrians. To reduce the size of the optical system and secure high light intensity, the communication lamp’s optical system was designed using an MLA. In addition, to secure a clear image on inclined ground, the design was carried out considering the overlap method. After that, the improved performance was confirmed by comparing it to the MLA optical system before overlapping.

引用次数: 0

Numerical Study of SPGD-based Phase Control of Coherent Beam Combining under Various Turbulent Atmospheric Conditions 不同湍流大气条件下基于SPGD的相干光束组合相位控制的数值研究

IF 0.1

Korean Journal of Optics and Photonics

Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.247

Hansol Kim, Jeongkyun Na, Y. Jeong

In this paper, based on a stochastic parallel gradient descent (SPGD) algorithm we study phase control of a coherent-beamcombining system under turbulent atmospheric conditions. Based on the statistical theory of atmospheric turbulence, we carry out the analysis of the phase and wavefront distortion of a laser beam propagating through a turbulent atmospheric medium. We also conduct numerical simulations of a coherent-beam-combining system with 7and 19-channel laser beams distorted by atmospheric turbulence. Through numerical simulations, we characterize the phase-control characteristics and efficiency of the coherent-beamcombining system under various degrees of atmospheric turbulence. It is verified that the SPGD algorithm is capable of realizing 7-channel coherent beam combining with a beam-combining efficiency of more than 90%, even under the turbulent atmospheric conditions up to   of    m   . In the case of 19-channel coherent beam combining, it is shown that the same turbulent atmospheric conditions result in a drastic reduction of the beam-combining efficiency down to 60%, due to the elevated impact of the corresponding refractive-index inhomogeneity. In addition, by putting together the number of iterations of the SPGD algorithm required for phase locking under atmospheric turbulence and the time intervals of atmospheric phenomena, which typically are of the order of μs, it is estimated that hundreds of MHz to a few GHz of computing bandwidth of SPGD-based phase control may be required for a coherent-beam-combining system to confront such turbulent atmospheric conditions. We expect the results of this paper to be useful for quantitatively analyzing and predicting the effects of atmospheric turbulence on the SPGD-based phase-control performance of a coherent-beam-combining system.

本文基于随机平行梯度下降(SPGD)算法研究了湍流大气条件下相干波束组合系统的相位控制问题。基于大气湍流的统计理论，对激光在湍流大气介质中的相位畸变和波前畸变进行了分析。我们还对7通道和19通道激光束受大气湍流畸变的相干束组合系统进行了数值模拟。通过数值模拟，研究了不同程度大气湍流条件下相干光束组合系统的相位控制特性和效率。验证了SPGD算法能够实现7通道相干束合并，即使在高达  m的湍流大气条件下，合并效率也能达到90%以上。在19通道相干波束合并的情况下，由于相应的折射率不均匀性的影响增加，相同的湍流大气条件导致波束合并效率急剧降低至60%。此外，通过将SPGD算法在大气湍流条件下锁相所需的迭代次数和大气现象的时间间隔(通常为μs数量级)结合起来，估计基于SPGD的相位控制计算带宽可能需要数百MHz到几GHz，以应对这种湍流大气条件下的相干束组合系统。我们期望本文的结果有助于定量分析和预测大气湍流对基于spgd的相干光束组合系统相位控制性能的影响。

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引用次数: 1

Slim Mobile Lens Design Using a Hybrid Refractive/Diffractive Lens 使用折射/衍射混合透镜的超薄移动透镜设计

IF 0.1

Korean Journal of Optics and Photonics

Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.281

Yong Chul Park, Jiyoung Joo, J. H. Lee

This paper reports a slim mobile lens design using a hybrid refractive/diffractive optical element. Conventionally a wide field of view (FOV) camera-lens design adopts a retrofocus type having a negative (-) lens at the forefront, so that it improves in imaging performance over the wide FOV, but with the sacrifice of longer total track length (TTL). However, we chose a telephoto type as a baseline design layout having a positive (+) lens at the forefront, to achieving slimness, based on the specification analysis of 23 reported optical designs. Following preliminary optimization of a baseline design and aberration analysis based on Zernike-polynomial decomposition, we applied a hybrid refractive/diffractive element to effectively reduce the residual chromatic spherical aberration. The optimized optical design consists of 6 optical elements, including one hybrid element. It results in a very slim telephoto ratio of 1.7, having an f-number of 2.0, FOV of 90°, effective focal length of 2.23 mm, and TTL of 3.7 mm. Compared to a comparable conventional lens design with no hybrid elements, the hybrid design improved the value of the modulation transfer function (MTF) at a spatial frequency of 180 cycles/mm from 63% to 71-73% at zero field (0 F), and about 2-3% at 0.5, 0.7, and 0.9 fields. It was also found that a design with a hybrid lens with only two diffraction zones at the stop achieved the same performance improvement.

本文报道了一种使用折射/衍射混合光学元件的超薄移动透镜设计。传统上，宽视场（FOV）相机镜头设计采用了在最前面具有负（-）镜头的后向聚焦类型，从而在宽FOV上提高了成像性能，但牺牲了较长的总轨道长度（TTL）。然而，根据对23种已报道光学设计的规格分析，我们选择了长焦型作为基线设计布局，在最前面有一个正（+）透镜，以实现纤薄。在对基线设计和基于Zernike多项式分解的像差分析进行初步优化后，我们应用了折射/衍射混合元件来有效地降低残余色差。优化的光学设计由6个光学元件组成，其中包括一个混合元件。它的长焦比非常小，为1.7，f值为2.0，FOV为90°，有效焦距为2.23 mm，TTL为3.7 mm。与没有混合元件的可比传统透镜设计相比，混合设计将180周期/mm空间频率下的调制传递函数（MTF）值从零场（0 f）时的63%提高到71-73%，在0.5时提高到约2-3%，0.7和0.9字段。还发现，在光阑处只有两个衍射区的混合透镜的设计实现了相同的性能改进。

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引用次数: 0

Analysis of Power Degradation and Distortion in Coherent-Beam Combining with Lens Aberration 相干光束结合透镜像差的功率退化和畸变分析

IF 0.1

Korean Journal of Optics and Photonics

Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.290

Byunghoon Kim, Jeongkyun Na, Y. Jeong

렌즈의 정밀도는 현미경에서부터 망원경까지 매우 중요한 문제로 대두되어왔다. 특히 에너지 전달 및 가공을 위해 사용되는 고출력 광섬유 레이저는 초점을 정확하게 맞추기 위해 더욱 정밀한 렌즈를 사용해야한다. 그럼에도 불구하고 실제 렌즈를 제작함에 있어서는 이상적인 렌즈와는 달리, 렌 즈의 두께, 표면의 불순물 혹은 왜곡 등 다양한 원인에 의하 여 수차가 발생하게 된다. 특히 렌즈의 직경이 증가할수록 렌즈의 표면을 균일하게 가공하는 것에는 큰 제한요소가 존 재하며, 초점거리가 짧은 렌즈의 경우 렌즈의 두께가 두껍 기 때문에 렌즈 수차가 급증하게 된다. 따라서 실제 상황에 서 렌즈를 투과한 레이저 빔(beam)의 형상은 이론적인 얇은 렌즈를 통과한 빔 형상이 아닌 수차를 고려한 빔 형상으로 Analysis of Power Degradation and Distortion in Coherent-Beam Combining with Lens Aberration

镜头的精度从显微镜到望远镜一直是一个非常重要的问题。特别是用于能量传递和加工的大功率光纤激光器，为了精确对焦，需要使用更精密的镜头。尽管如此，在实际制作镜片时，与理想镜片不同，镜片的厚度、表面的杂质或扭曲等多种原因会产生数次差异。特别是镜头直径越大，镜头表面加工越均匀存在很大的限制因素，对于焦距较短的镜头，由于镜头厚度较厚，镜头数差会剧增。因此，在实际情况下，透射镜片的激光束（beam）的形状不是理论上的通过薄镜片的光束形状，而是考虑数次的光束形状，即Analysis of Power Degradation and Distortion in Coherent-Beam Combining with Lens Aberration

引用次数: 0

Numerical Modeling of Optical Energy Transfer Based on Coherent Beam Combination under Turbulent Atmospheric Conditions 湍流大气条件下基于相干光束组合的光能传递数值模拟

IF 0.1 Q4 OPTICS

Korean Journal of Optics and Photonics

Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.274

Jeongkyun Na, Byunghoon Kim, Hyesun Cha, Y. Jeong

In this paper, the effect of atmospheric turbulence is numerically modeled and analyzed via a phase-screen model, in regard to long-range optical energy transfer using coherent beam combination. The coherent-beam-combination system consists of three channel beams pointing at a target at a distance of 1-2 km. The phase and propagation direction of each channel beam are assumed to be corrected in an appropriate manner, and the atmospheric turbulence that occurs while the beam propagates through free space is quantified with a phase-screen model. The phase screen is statistically generated and constructed within the range of fluctuations of the structure constant   from 10−15 to 10−13 [m  ]. Particularly, in this discussion the shape, distortion, and combining efficiency of the 3-channel combined beam are calculated at the target plane by varying the structure constant used in the phase-screen model, and the effect of atmospheric turbulence on beam-combination efficiency is analyzed. Analysis with this numerical model verifies that when coherent beam combination is used for long-range optical energy transfer, the received power at the target can be at least three times the power obtainable by incoherent beam combination, even for maximal atmospheric fluctuation within the given range. This numerical model is expected to be effective for analyzing the effects of various types of atmospheric-turbulence conditions and beam-combination methods when simulating long-range optical energy transfer.

本文通过相屏模型对大气湍流对相干光束组合的远程光能传输的影响进行了数值模拟和分析。相干波束组合系统由三个通道波束组成，指向距离为1-2公里的目标。假设对各通道波束的相位和传播方向进行了适当的校正，并采用相屏模型对波束在自由空间中传播时发生的大气湍流进行了量化。统计生成相屏，并在结构常数_在10−15 ~ 10−13 [m ]的波动范围内构建相屏。特别地，本文通过改变相屏模型中的结构常数，计算了目标平面上三通道组合波束的形状、畸变和组合效率，并分析了大气湍流对波束组合效率的影响。通过该数值模型的分析，验证了当使用相干光束组合进行远程光能传输时，即使在给定范围内大气波动最大的情况下，目标处接收到的功率至少是非相干光束组合获得的功率的3倍。该数值模型可以有效地分析各种大气湍流条件和光束组合方法对模拟远程光能传输的影响。

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