• Current Optics and Photonics
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• v.5 no.6
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• pp.699-710
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• 2021

In this study, we propose a biomimetic optical structure design methodology for investigating micro-optical mechanisms associated with the compound eyes of insects. With these compound eyes, insects can respond fast while maintaining a wide field of view. Also, considerable research attention has been focused on the insect compound eyes to utilize these benefits. However, their nano micro-structures are complex and challenging to demonstrate in real applications. An effectively integrated design methodology is required considering the manufacturing difficulty. We show that photorealistic ray-traced visualization is an effective method for designing the biomimetic of a micro-compound eye of an insect. We analyze the image formation mechanism and create a three-dimensional computer-aided design model. Then, a ray-trace visualization is applied to observe the optical image formation. Finally, the segmented images are stitched together to generate an image with a wide-angle; the image is assessed for quality. The high structural similarity index (SSIM) value (approximately 0.84 to 0.89) of the stitched image proves that the proposed MATLAB-based image stitching algorithm performs effectively and comparably to the commercial software. The results may be employed for the understanding, researching, and design of advanced optical systems based on biological eyes and for other industrial applications.

• Journal of Photoscience
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• v.9 no.2
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• pp.243-245
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• 2002

Pigment-dispersing factor (PDF) is an octadecapeptide distributed in the optic lobe and the brain in a variety of insect species. There are lines of evidence suggesting possible involvement of PDF in the insect circadian system. However, its physiological roles in the circadian time keeping mechanism have not been clearly defined. In this study, we have examined the phase shifting effects of Gryllus-PDF on the circadian locomotor rhythm in the cricket Gryllus bimaculatus of which circadian clock is located in the optic lobe. Phase shifts in the circadian activity rhythm were measured following microinjection of 22nl of vehicle (Ringer's solution) or O.lmM PDF into the optic lobe through the compound eye at various circadian times. The results showed that PDF induced phase shifts of the circadian clock in a phase-dependent manner, suggesting that it may play a role as an input signal for the circadian clock.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.128.1-128.1
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• 2014

잠자리, 벌 등 곤충과 새우, 가재 등 갑각류를 포함하는 절지동물류에서 발견되는 겹눈(compound eye)구조는 볼록한 형태이기 때문에 일반 단일렌즈(single lens)형 눈에 비해 매우 넓은 시야각을 가지며, 깊은 심도를 갖는 특징이 있다. 기존 카메라가 갖기 어려운 겹눈의 독특한 장점으로 인해, 곤충의 눈을 모방하는 연구는 많은 사람들의 주목을 받고 있다. 겹눈구조는 일반적으로 수백에서 수만개의 홑눈(ommatidium)이 모여 다발을 이루고 있으며, 각 홑눈은 겉에서부터 마이크로렌즈 형태의 각막, 수정추, 감간(rhabdom)형태로 이루어져 있다. 따라서 이러한 겹눈구조를 모방하기 위해서는 인공홑눈을 제작하고 이를 반구형으로 배열하는 것이 필수적이다. 그러나 실리콘 반도체를 기반으로 하는 이미지 센서는 딱딱하고 편평하여 굴곡진 형태로 배열이 어렵기 때문에 곤충눈을 모방한 형태의 구조물은 몇몇 연구그룹에서 개발된 사례가 있으나, 이미징이 가능한 곤충눈 시스템의 개발은 보고된 바가 없었다. 본 발표에서는 최근에 연구가 진행되고 있는 플렉서블 전자소자에 기반한 곤충눈을 모방한 이미징 시스템에 대해서 다루고자 한다.

• Korean journal of applied entomology
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• v.42 no.4
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• pp.361-365
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• 2003

Several species of planthoppers such as brown planthopper, N. lugens (Stal) (BPH), smaller brown planthopper, Laodelphax striatellus (Fall n) (SBPH), and white-backed planthopper, Sogatella furcifera (Horv th) (WBPH) are distributed in Korean rice paddies but not easy to discriminate them in situ. Accurate discrimination of them is an indispensable process in the forecasting for their outbreak and control. Especially, innovative discrimination method for BPH was required because BPH was one of the most important insect pest of rice. Nymphs and adults of BPHs, SBPHS, and WBPHS, thus, were examined their morphological characteristics in the paddies and laboratory. The nymphs of BPH had different characters from those of SBPH and WBPH. The nymphs of BPH had white fluorescent spot between bottom of compound eye and antenna, while there was no that spot the other two species. The white spot was the brightest at the nymphs just after hatching and getting weaker as the nymph developed. At last the white spot was totally disappeared at the adult stage. This white spot was innovative criterium to discriminate nymphs of BPH, SBPH, and WBPH in rice paddies.