There are trace evidence generated by contact between the victim and the criminal at the crime scene, and in particular, latent fingerprints are commonly found evidence and a strong evidence of personal identification. The latent fingerprints found at the crime scene remain on the surface of living tools such as glass bottles, plastic containers, and cups. The taking the latent fingerprints is usually performed by applying a single or combined method classified into gas, solid, and liquid methods according to the surface properties of which the fingerprints are released, and fingerprint transfer plates or fingerprint imaging methods are used to record them. However, in the case of fingerprint transfer plates, there are limitations that are difficult to apply depending on the shape of the evidence surface, and the fingerprinting method also had problems such as diffuse reflection depending on the shape of the evidence surface. In this study, we developed an improved fingerprinting technique that can effectively record latent fingerprints appearing on non-porous surfaces with amorphous curved bodies through back-light fingerprinting using a Luminescent liquid. Evidence such as glass bottles, plastic containers, and cups are mainly transparent in the form of curved surfaces, and there are many restrictions on fingerprint image taking due to diffuse reflection and background reflection in photography, such as imprinting manufacturer's trademark or pattern on the evidence surface. Using the luminescent liquid, the light-emitting liquid was filled in the evidence to remove the disturbance from the background, and using the light of the luminescent liquid, the ridge of the light-transmitting fingerprint appeared dark, and the furrow between the light-transmitting ridge and the ridge appeared bright. In particular, the luminescent liquid prepared in this study was able to secure advantages such as low cost and easy and fast manufacturing by using a detergent commonly used in daily life. This study is not a technique for developing latent fingerprints, but an improved fingerprint image under certain conditions, and further research should be conducted to develop a dedicated light source that can irradiate light on various bottle-type evidence.

The performance of astronomical telescopes can be negatively affected by atmospheric turbulence. To address this issue, techniques for atmospheric turbulence correction have been developed, requiring the simulation of atmospheric turbulence in the laboratory. The most practical way to simulateatmospheric turbulence is through the use of a phase plate. When measuring a phase plate that simulates strong turbulence, a Shack-Hartmann wavefront sensor is commonly used. However, laser power decreases as it passes through the phase plate, potentially leading to a weak laser signal at the sensor. This paper investigates the need to control laser-power intensity when measuring a phase plate that simulates strong atmospheric turbulence, and examines the effects of laser-power intensity on the measured wavefront. For phase plates with relatively high Fried parameter r 0 , the laserpower intensity causes a variation of over 10% in r 0 . For phase plates with relatively low r 0 , the laser-power intensity causes a variation of less than5%, which means that the influence of laser-power intensity is negligible for phase plates that simulate strong atmospheric turbulence. Based on thesystem described in this paper, a phase plate simulating strong atmospheric turbulence can be measured with a laser-power intensity of 5 mW or higher. Therefore, controlling the laser’s output power is necessary when measuring a phase plate for simulating atmospheric turbulence, especially for phase plates with low r 0 values.

In the past, display devices have undergone many changes, such as plasma TVs and LCDs, and have continued to develop. Recently, new display technologies, such as Organic Light Emitting Diode displays and Inorganic Light Emitting Diode displays, have been developed. Among them, Micro LED displays have the potential to improve performance more than LCDs and OLEDs, but a lot of effort and time are needed until the mass production technology (transfer and bonding) of Micro LED displays is developed. We have developed a new Micro LED display light source that can be produced using existing transfer and bonding process technologies to enable faster commercialization of Micro LED in the industry. This light source is TFT deposition on LED. TFT deposition on LED has the advantage of being able to produce displays using existing process technology, making early commercialization of display application products possible. In this study, we applied the Active Driving method to verify the performance of TFT deposition on LED as a display to determine its commercialization potential. Additionally, to facilitate faster application of Micro LED in the industry, we applied TFT deposition on LED to Optical Wireless Communication systems, which are widely used in application service areas such as safety/security and sensors, to verify its communication performance. The experimental results confirmed that TFT deposition on LED is not only capable of AM driving but can also be applied to OWC systems.

A transparent photoelectric device was fabricated using a metal-oxide heterojunction. Owing tothe large energy bandgap of the p-type (Cu2O)–n-type (Ga2O3) junction, a space charge regionwas spontaneously formed, which provided an electric field to collect the photogeneratedcarriers, resulting in photovoltaics with solar-cell features. The formation of the Cu2O layer wasmodulated by the O2 flow rate to tune the photovoltage to 910 mV and the photocurrent to 3.2mA/cm2. In addition, a transparent photovoltaic device was used along with the photodetectorsto achieve high responsivity (149 mA/W) and detectivity (1.39 × 1012 Jones) at a wavelength of340 nm. This suggests that high-performance and transparent Cu2O/Ga2O3 devices can beadopted for self-powering invisible human electronics.

(Background and Purpose) In the development and installation of nighttime landscape lighting, it is essential to establish criteria for determining user satisfaction and identifying the priority and basic requirements. Accordingly, this study aims to derive crucial lighting factors that need to be considered in nighttime landscape lighting planning, design, implementation, and approval processes, based on the opinions of both the general public and experts in the field, utilizing the Kano model and Analytic Hierarchy Process (AHP) analysis. (Method) Lighting factors for nighttime landscape lighting were derived by analyzing the composition items and content of nighttime landscape planning guidelines from various local governments, detailed lighting plans from Seoul's 'Good Lighting Review,' relevant literature, and previous studies. A survey using the Kano model and AHP was conducted based on the identified lighting factors. (Results) The results of the expert group evaluation using AHP revealed that, quality factors related to 'Aesthetics & Harmony, Safety, Light Pollution Prevention' were identified as the most important. These corresponded with the lighting factors assessed by the general public, who considered them strong inherent quality attributes and strong one-dimensional quality attributes. Control and management functions such as 'Storytelling & Content Provision, Automatic Lighting Environment Changes,' and aesthetics & harmony aspects like 'Accent Lighting, Light Tunnels, Sculpture Lighting, and Gate Lighting installations' were evaluated as attractive quality attributes by the general public and were also rated as important by the expert group. (Conclusions) The following factors must be inevitably considered during planning, design, implementation, and approval processes for nighttime landscape lighting as essential elements: ① Safety: Ensuring appropriate brightness for nighttime activities, providing visibility for up to 10 meters ahead, and preventing glare. ② Aesthetics & Harmony: Illumination that considers architectural and structural features, finishing materials, and inherent landscape imagery, harmonizing with the surrounding light environment through appropriate luminance contrast and color temperature application. Avoidance of glare from lighting fixtures and their shapes and finishes should be selected considering the overall harmony with daytime and night time landscape and architecture, achieving specialized designs reflecting local characteristics and sense of place. ③ Prevention of Light Pollution : Compliance with light emission standards, ensuring the illumination angle is directed only the target objects, prevention of upward light, spill light, and trespass light, and time-specific lighting plans. ④ Energy Saving: Avoiding excessive lighting beyond necessity. ⑤ Maintenance Convenience: Usage of durable equipment, selection of fixtures with high dustproof and waterproof ratings, corrosion and degradation-resistant lighting fixture installation for easy cleaning and lamp management, and easy replacement/installation of light sources or control systems.

천체망원경의 성능은 여러가지 요소에 의해 결정된다. 대기 난류도 그 중 하나인데, 대기 난류는 망원경으로 수집한 빛을 왜곡시켜 이미지의 선명도와 해상도를 저하시킨다. 때문에 대기 난류를 보정하기 위한 기술이 연구되어 왔다. 보정 기술을 연구하기 위해서는 대기 난류를 실험실에서 모사해야 하며, 그 중 가장 실용적인 방법으로 위상판을 이용한 방법이 있다. 심한 난기류를 모사한 위상판을 측정할 때에는 주로 샥하트만 파면 센서로 측정하게 된다. 이 때, 레이저 광원은 위상판을 거쳐 샥-하트만 파면 센서로 들어가게 되는데 위상판을 거치면서 레이저의 세기가 줄어들고, 이로 인해 샥-하트만 파면 센서가 위상판을 측정하지 못하는 경우가 발생한다. 본 논문에서는 난기류를 모사한 위상판 측정 시 레이저 출력 조절의 필요성과 레이저 출력이 측정된 파면에 어떤 영향을 미치는지를 알아본다. 프라이드 파라미터 r₀이 상대적으로 낮은 위상판의 경우 레이저 출력으로 인해 10% 이상 r₀이 변화하였다. r₀이 상대적으로 높은 위상판의 경우 레이저 출력으로 인한 변화가 5% 미만으로 r₀이 거의 변하지 않음을 보였다. 따라서 난기류가 심한 대기 상태를 모사한 위상판일수록 레이저 출력의 영향이 미미함을 알 수 있었다. 또한, 본 논문의 시스템을 기준으로 레이저 출력 5 mW 이상에서 난기류를 모사한 위상판을 측정할 수 있었다.

헤드 마운티드 디스플레이(head mounted display, HMD)를 이용한 증강 현실(augmented reality, AR)은 군사, 의료, 제조, 게임 및 교육 등 다양한 분야에서 활용되고 있다. 본 논문에서는 HMD에 가장 필수적인 AR 광학계의 설계 및 제작에 대해 논의한다. HMD용 AR 광학계는 디스플레이의 증강 영상과 현실 세계를 동시에 볼 수 있는 넓은 투명 영역이 필요하다. 이를 위해, AR 광학계를 각각의 특성에 따라 세 부분으로 나누어 설계 및 제작하였다. 그리고 3개의 광학계를 하나의 완전한 AR 광학계로 만들기 위해 필요한 ultra-violet (UV) 접착층의 굴절률을 고려해 설계함으로써 입력 광원이 UV 접착 층을 통과할 때의 광경로 이동(shift) 현상을 최소화하였다. 또한, AR 광학계를 설계할 때 축외 수차를 보정하고 양산에 적합하도록 2개의 비구면을 사용했다. 끝으로 HMD 양산을 위해 두께 11 mm, 대각선 화각(diagonal field of view) 40°, 무게 11.3 g의 비구면 AR 광학계를 설계하고 제작하였다.

하절기의 높은 일사량은 작물의 과도한 호흡을 유발하여 광합성을 감소시킨다. 또한 주로 하절기에 발생하는 장마는 온실 내부에 저일조 환경을 유발한다. 저일조 환경은 작물의 생육과 생산량을 감소시키는 원인이 될 수 있다. 본 연구는 하절기 차광과 보광이 오이의 생육과 생산량에 미치는 영향에 대해서 조사하기 위해 수행되었다. 오이 접목묘는 2022년 8월 30일에 플라스틱 온실 2동에 정식하였다. 온실 내부의 광량을 감소시키기 위해 온실 1동에 차광 스크린을 설치하였다. 보광처리는 2022년 9월 7일부터 2022년 10월 20일까지 수행되었다. 고압나트륨등(high-pressure sodium lamp), 백색 LED(white LED, red:green:blue = 5:3:2), RB LED(combined red and blue LED, red:blue = 7:3)를 보광 광원으로 사용하였고, 무처리를 대조구로 설정하였다. 보광 처리는 일출 전과 일몰 후 2시간씩 수행하였고, 보광 광도는 150±20 µmol·m^-2·s^-1로 설정하였다. 식물 초장, 엽장, 엽폭, SPAD는 차광 처리에 의해 증가하는 경향을 보였다. RB LED에서는 차광 처리와 관계없이 경경이 유의성 있게 증가되었다. 과실의 생체중과 건물중은 차광과 보광 처리에서 유의미한 차이가 없었다. 과실의 평균 과중은 수확일이 지날수록 보광처리 간의 유의한 차이는 없었다. 결론적으로, 본 연구에서 하절기 오이 재배 시 50% 수준의 차광 처리는 오이의 생육을 유의하게 향상시켰다. 또한, 보광 대조구에서 생육과 과실 특성이 좋았다. 본 연구는 오이 재배 시 보광 기술을 적용하기 위한 기초 연구 자료로 활용될 수 있다.