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Stretchable and reflective displays: materials, technologies and strategies
선정윤,Gimin Sung,Mi-Ji Kim,Do Yoon Kim 나노기술연구협의회 2019 Nano Convergence Vol.6 No.21
Displays play a significant role in delivering information and providing visual data across all media platforms. Among displays, the prominence of reflective displays is increasing, in the form of E-paper, which has features distinct from emissive displays. These unique features include high visibility under daylight conditions, reduced eye strain and low power consumption, which make them highly effective for outdoor use. Furthermore, such characteristics enable reflective displays to achieve high synergy in combination with wearable devices, which are frequently used for outdoor activities. However, as wearable devices must stretch to conform to the dynamic surfaces of the human body, the issue of how to fabricate stretchable reflective displays should be tackled prior to merging them with wearable devices. In this paper, we discuss stretchable and reflective displays. In particular, we focus on reflective displays that can be divided into two types, passive and active, according to their responses to stretching. Passive displays, which consist of dyes or pigments, exhibit consistent colors under stretching, while active displays, which are based on mechanochromic materials, change their color under the same conditions. We will provide a comprehensive overview of the materials and technologies for each display type, and present strategies for stretchable and reflective displays.
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함정 탑재 레이더의 능동 열 제어를 위한 열전 냉각 장치 성능의 수치 해석적 연구
임성환(Sung-Whan Yim),이동균(Dong-Kyun Lee),김흥태(Heung-Tae Kim),라영은(Young-Eun Ra),김훈(Hoon Kim),박기민(Gimin Park),김우철(Woochul Kim) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.7
함정에 탑재되는 레이더 안테나 시스템은 고밀도 발열량을 지닌 열원을 포함함으로써 집중적인 냉각이 요구된다. 열원의 냉각뿐만 아니라 열원 간의 온도 균일성도 요구되기 때문에 능동적인 냉각이 가능한 열전 냉각 소자를 이용하여 온도 균일성을 이룰 수 있는 시스템의 수치 해석에 대한 연구를 진행하였다. 열전 냉각 소자는 흘려주는 전류 및 설치 면적에 따라 열원의 구체적이고 능동적인 냉각이 가능해진다. 본 논문에서는 전류 및 전력에 따른 열전 소자의 냉각 성능에 대한 결과를 도출해 내였으며 열전 소자 설치 면적에 따른 열원의 냉각량 및 온도의 균일성에 대해 해석하였다. Naval vessel radar systems contain heat sources that require concentrated cooling due to the significant amount of heat they generate. In addition to cooling, these heat sources need to be within certain range of temperature among themselves to avoid signal jamming. To address this issue, we present a numerical analysis of a radar antenna system whose heat sources are equipped with thermoelectric refrigeration devices to control their temperature distribution. The refrigeration capacity of thermoelectric devices depends on the current applied onto the device and also on the amount of area installed onto the heat source. In this study, we have obtained results for the cooling capability of thermoelectric devices with varying current and power consumption to acquire a more uniform temperature distribution among heat sources.
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파티션 복구 도구 검증용 데이터 세트 개발 및 도구 평가
박송이(Songyee Park),허지민(Gimin Hur),이상진(Sang-jin Lee) 한국정보보호학회 2017 정보보호학회논문지 Vol.27 No.6
손상된 저장매체에 대해서 디지털포렌식 조사를 진행할 때 복구 도구를 활용한다. 하지만 사용하는 복구 도구에 따라서 복구 결과가 다른 문제가 존재한다. 그러므로 정확한 조사를 위해서는 도구의 성능과 한계점을 파악하여 사용할 필요가 있다. 본 논문에서는 이러한 파티션 복구 도구의 성능을 검증할 수 있도록 MBR, GPT 디스크 인식방식과 FAT32, NTFS 파일시스템의 구조적 특징을 고려한 검증 시나리오를 제시한다. 그 후 검증 시나리오를 바탕으로 제작한 데이터 세트를 통하여 기존 복구 도구에 대한 성능 검증을 진행한다. When a digital forensic investigation is conducted on a damaged storage medium, recovery is performed using a recovery tool. But the result of each recovery tool is different depending on the tools. Therefore, it is necessary to identify and use the performance and limitations of the tool for accurate investigation. In this paper, we propose a scenario considering the disk recognition type such as MBR, GPT and the structural characteristics of FAT32 and NTFS filesystem to verify the performance of the partition recovery tool. And then We validate the existing tools with the data set built on the scenarios.
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Jaeyoung Song,TaeHyeong Jeon,Gimin Kim,Sang Hyun Park,Sul Gee Park 사단법인 항법시스템학회 2023 Journal of Positioning, Navigation, and Timing Vol.12 No.3
The International Maritime Organization (IMO) states that the recommended horizontal accuracy for coastal and offshore areas is 10 m, the Alert Limit (AL) is 25 m, the time to alert is 10 seconds, and the integrity risk (IR) is 10-5 per three hours. For operations requiring high accuracy, such as tugs and pushers, icebreakers, and automated docking, the IMO dictates that a high level of positioning accuracy of less than one meter and a protection level of 0.25 meters (for automated docking) to 2.5meters should be achieved. In this paper, we analyze a method of calculating the user-side protection level of the centimeterlevel precision Global Navigation Satellite System (GNSS) that is being studied to provide augmentation information for the precision Positioning, Navigation and Timing (PNT) service. In addition, we analyze standardized integrity forms based on RTCM SC-134 to propose an integrity information form and generate a centimeter-level precise PNT service plan.
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