{"title":"The gap between perceived mental health needs and actual service utilization in Australian adolescents.","authors":"Md Irteja Islam, Fakir Md Yunus, Samia Naz Isha, Enamul Kabir, Rasheda Khanam, Alexandra Martiniuk","doi":"10.1038/s41598-022-09352-0","DOIUrl":"10.1038/s41598-022-09352-0","url":null,"abstract":"<p><p>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.</p>","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"5430"},"PeriodicalIF":3.8,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8971377/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57537391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
{"title":"3-channel Tiled-aperture Coherent-beam-combining System Based on Target-in-the-loop Monitoring and SPGD Algorithm","authors":"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","doi":"10.3807/KJOP.2021.32.1.001","DOIUrl":"https://doi.org/10.3807/KJOP.2021.32.1.001","url":null,"abstract":"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","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"32 1","pages":"1-8"},"PeriodicalIF":0.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70162321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Optimization of the Optical System for an Aircraft Warning Light Using a Fresnel Lens","authors":"Jong-Tae Kim, Hyeongyeol Park","doi":"10.3807/KJOP.2021.32.1.015","DOIUrl":"https://doi.org/10.3807/KJOP.2021.32.1.015","url":null,"abstract":"","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"32 1","pages":"15-21"},"PeriodicalIF":0.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70162365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Jung, M. Jung, Kangin Lee, Taewoong Kim, Jae-Ihn Kim, Yongsoo Lee, J. Cho
{"title":"Linearly Polarized 1-kW 20/400-㎛ Yb-doped Fiber Laser with 10-GHz Linewidth","authors":"Y. Jung, M. Jung, Kangin Lee, Taewoong Kim, Jae-Ihn Kim, Yongsoo Lee, J. Cho","doi":"10.3807/KJOP.2021.32.3.120","DOIUrl":"https://doi.org/10.3807/KJOP.2021.32.3.120","url":null,"abstract":"","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"32 1","pages":"120-125"},"PeriodicalIF":0.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70162046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Han-Yul Lee, Won-Kyoun Jun, Sang Min Lee, Ki-hwan Kim, Hyungil Seo, S. Park, M. Jung
{"title":"A Study on Performance and Sensitivity Improvement of an Off-axis TMA Telescope Optical System by Changing the Aperture-stop Position","authors":"Han-Yul Lee, Won-Kyoun Jun, Sang Min Lee, Ki-hwan Kim, Hyungil Seo, S. Park, M. Jung","doi":"10.3807/KJOP.2021.32.1.009","DOIUrl":"https://doi.org/10.3807/KJOP.2021.32.1.009","url":null,"abstract":"","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"32 1","pages":"9-14"},"PeriodicalIF":0.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70162352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jae-Yeong Seo, Hyun-Hwa Lee, Michael Kong, Hwan-young Choi, M. Jung
{"title":"A Study of the Design of Automotive Communication Lamps Using Microlens Arrays","authors":"Jae-Yeong Seo, Hyun-Hwa Lee, Michael Kong, Hwan-young Choi, M. Jung","doi":"10.3807/KJOP.2021.32.3.101","DOIUrl":"https://doi.org/10.3807/KJOP.2021.32.3.101","url":null,"abstract":"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.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"32 1","pages":"101-107"},"PeriodicalIF":0.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70161975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Numerical Study of SPGD-based Phase Control of Coherent Beam Combining under Various Turbulent Atmospheric Conditions","authors":"Hansol Kim, Jeongkyun Na, Y. Jeong","doi":"10.3807/KJOP.2020.31.6.247","DOIUrl":"https://doi.org/10.3807/KJOP.2020.31.6.247","url":null,"abstract":"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.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"247-258"},"PeriodicalIF":0.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45005424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Slim Mobile Lens Design Using a Hybrid Refractive/Diffractive Lens","authors":"Yong Chul Park, Jiyoung Joo, J. H. Lee","doi":"10.3807/KJOP.2020.31.6.281","DOIUrl":"https://doi.org/10.3807/KJOP.2020.31.6.281","url":null,"abstract":"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.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"281-289"},"PeriodicalIF":0.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45048735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Analysis of Power Degradation and Distortion in Coherent-Beam Combining with Lens Aberration","authors":"Byunghoon Kim, Jeongkyun Na, Y. Jeong","doi":"10.3807/KJOP.2020.31.6.290","DOIUrl":"https://doi.org/10.3807/KJOP.2020.31.6.290","url":null,"abstract":"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","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"290-294"},"PeriodicalIF":0.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49052280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Study of the Optical System Design of a Reflective LED Stand to Reduce Glare","authors":"Michael Kong, M. Jung","doi":"10.3807/KJOP.2020.31.6.334","DOIUrl":"https://doi.org/10.3807/KJOP.2020.31.6.334","url":null,"abstract":"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","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"334-343"},"PeriodicalIF":0.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44662347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}