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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 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 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
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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 Pub Date : 2021-01-01 DOI: 10.3807/KJOP.2021.32.1.015
Jong-Tae Kim, Hyeongyeol Park
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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 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
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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 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
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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 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.
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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 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 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 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
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引用次数: 0
Study of the Optical System Design of a Reflective LED Stand to Reduce Glare 反射式LED支架降低眩光的光学系统设计研究
IF 0.1 Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.334
Michael Kong, M. Jung
기존의 조명은 광원으로 백열등과 형광등을 사용하였지만 최근 효율, 수명 및 환경적인 측면에서 우수한 특성을 가지 는 LED로 광원이 대체되고 있다. 하지만 LED는 작은 면 적에서 고휘도의 빛이 발산됨에 따라 천장등, 스탠드 조명과 같은 실내 조명으로 사용될 경우, 높은 휘도와 hot spot으로 인한 불균일한 휘도 분포로 인하여 눈부심을 발생시킨다. 이 러한 눈부심은 피로감뿐만 아니라 사용자의 활동에 방해를 주기 때문에 이를 고려하여 조명의 광학계 설계가 이루어져 야 한다. 특히 LED 스탠드의 경우 사용자의 눈에 가깝게 위치되어 있으며, 장시간 사용되기 때문에 눈부심을 감소시키기 위한 연구가 필수적이다. 기존 LED 스탠드의 경우, 추가적인 광 학계 없이 확산판이나 아크릴판 등을 사용하여 눈부심을 감 소시키려고 하였으나, 이 경우에도 그림 1과 같이 LED의 노 출로 인해 hot spot이 발생하기 때문에 눈부심이 제거되지 않는다. 따라서 본 논문에서는 LED의 hot spot으로 인한 눈부심을 감소시키기 위해 간접광을 형성하는 반사형 LED 스탠드 설 계를 진행하고, 기존 LED 스탠드 제품과의 휘도 비교 및 분 석을 통해 반사형 LED 스탠드의 눈부심을 평가하였다. 또 Study of the Optical System Design of a Reflective LED Stand to Reduce Glare
现有的照明光源使用白炽灯和日光灯,但最近光源被在效率、寿命及环境方面具有优秀特性的LED所代替。但是LED在小的面面积上散发出高亮度的光,在室内使用时,会因较高的亮度和hot spot引起的不均匀的亮度分布而产生耀眼。这种耀眼不仅会让人感到疲劳,还会妨碍使用者的活动,因此应该考虑到这一点,对照明的光学设计进行设计。特别是LED台灯的位置接近使用者的眼睛,使用时间长,因此为了减少耀眼感的研究是必需的。对于现有的LED灯,在没有额外光学界的情况下,使用扩散板或丙烯酸板等来减少耀眼,但是在这种情况下,正如图1所示,LED的溢出会产生hot spot,因此不会消除耀眼。因此本论文为了减少LED的hot spot引起的耀眼,进行了间接光的反射型LED台灯设计,通过与现有LED台灯产品的亮度比较及分析,评价了反射型LED台灯的耀眼。a Reflective LED Stand to Reduce Glare
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引用次数: 1
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Korean Journal of Optics and Photonics
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