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다수의 위협과 복수의 목적지가 존재하는 임무에서 복수 무인기의 생존율 극대화를 위한 최적 경로 계획 및 분석
정성식(Seongsik Jeong),장대성(Dae-Sung Jang),박현진(Hyunjin Park),성태현(Taehyun Seong),안재명(Jaemyung Ahn) 한국항공우주학회 2015 韓國航空宇宙學會誌 Vol.43 No.6
본 연구에서는 각각 다른 목적지에서 다수의 임무를 수행해야하는 복수 무인항공기(Unmanned Aerial Vehicle, UAVs)의 경로를 결정할 때, 무인항공기의 생존가능성을 고려하여 경로를 결정하는 프레임워크를 제안하였다. 본 라우팅 문제는 무인항공기 안전과 임무 완료시간 간의 trade-off 를 나타내는 비용 매트릭스를 이용한 차량경로문제(Vehicle Routing Problem, VRP)로 정의할 수 있다. 특정위치에서 무인항공기의 위험 레벨은 감지될 확률과 격추될 확률을 고려하여 모델링 하였고, 위협 레벨과 비행거리를 고려한 두 지역간의 최소비용경로는 육각형격자(Hexagonal cells)에서 Dijkstra 알고리듬을 사용하여 결정하였다. 또한, 지속적으로 다수의 적을 감시·정찰하는 임무를 수행하는 복수 무인항공기의 최적경로를 결정하는 case study를 수행하였으며, 그 결과를 논의하였다. This paper proposes a framework to determine the routes of multiple unmanned aerial vehicles (UAVs) to conduct multiple tasks in different locations considering the survivability of the vehicles. The routing problem can be formulated as the vehicle routing problem (VRP) with different cost matrices representing the trade-off between the safety of the UAVs and the mission completion time. The threat level for a UAV at a certain location was modeled considering the detection probability and the shoot-down probability. The minimal-cost path connecting two locations considering the threat level and the flight distance was obtained using the Dijkstra algorithm in hexagonal cells. A case study for determining the optimal routes for a persistent multi-UAVs surveillance and reconnaissance missions given multiple enemy bases was conducted and its results were discussed.
Spexin-Based Galanin Receptor Type 2 Agonist for Comorbid Mood Disorders and Abnormal Body Weight
Yun, Seongsik,Reyes-Alcaraz, Arfaxad,Lee, Yoo-Na,Yong, Hyo Jeong,Choi, Jeewon,Ham, Byung-Joo,Sohn, Jong-Woo,Kim, Dong-Hoon,Son, Gi Hoon,Kim, Hyun,Kwon, Soon-Gu,Kim, Dong Sik,Kim, Bong Chul,Hwang, Jong Frontiers Media S.A. 2019 Frontiers in neuroscience Vol.13 No.-
<P>Despite the established comorbidity between mood disorders and abnormal eating behaviors, the underlying molecular mechanism and therapeutics remain to be resolved. Here, we show that a spexin-based galanin receptor type 2 agonist (SG2A) simultaneously normalized mood behaviors and body weight in corticosterone pellet-implanted (CORTI) mice, which are underweight and exhibit signs of anhedonia, increased anxiety, and depression. Administration of SG2A into the lateral ventricle produced antidepressive and anxiolytic effects in CORTI mice. Additionally, SG2A led to a recovery of body weight in CORTI mice while it induced significant weight loss in normal mice. In Pavlovian fear-conditioned mice, SG2A decreased contextual and auditory fear memory consolidation but accelerated the extinction of acquired fear memory without altering innate fear and recognition memory. The main action sites of SG2A in the brain may include serotonergic neurons in the dorsal raphe nucleus for mood control, and proopiomelanocortin/corticotropin-releasing hormone neurons in the hypothalamus for appetite and body weight control. Furthermore, intranasal administration of SG2A exerted the same anxiolytic and antidepressant-like effects and decreased food intake and body weight in a dose-dependent manner. Altogether, these results indicate that SG2A holds promise as a clinical treatment for patients with comorbid mood disorders and abnormal appetite/body weight.</P>
Design of a Multiple-UAS Mission Model using Activity-based Modeling
Hyunjin Park,Seongsik Jeong,Jaemyung Ahn 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
This paper introduces an activity-based modeling design and subsequently analyzes mission models of a UAS mission with multiple UA. We use activity-based modeling within the Arena simulation environment as our main modeling methodology, where each stage of a mission’s progress is represented by process models and the UA performing said missions correspond to the agents. All processes are connected to create a single comprehensive model that simulates the behavior of the UA agents as they perform their missions. We select three mission types: reconnaissance, signals intelligence, and precision target location. The model calculates certain key performance parameters that measure the performance of the UA in carrying out a specified mission.
정승한(Seunghan Jeong),권오봉(Oubong Gwun),신성식(Seongsik Shin) 대한전자공학회 2015 전자공학회논문지 Vol.52 No.3
반도체 식각 전산모사에서는 플라즈마 입자를 생성하는 소스의 모델링이 필요하다. 본 논문에서는 플라즈마 식각 공정에서 사용하는 소스를 확률분포함수로 모델링하고, 몬테칼를로 방법을 이용하여 특정 프로프일의 플럭스를 계산하는 실험을 하였다. 소스의 모델링 파라미터로 소스와 셀 사이의 거리, 소스에서 방사하는 입자수가 있고, 플럭스 계산에 미치는 추가적인 파라미터로 프로파일 상의 셀의 수(셀의 면적)이 있다. 방사하는 입자 분포는 사용하는 소스의 물성에 따라 가우시안 분포와 코사인 분포로 모델링 할 수 있는데, 본 논문은 이들 각각에 대하여 파라미터를 바꿔가며 전산모사를 한 결과를 보인다. 오차율은 가우지안(Incident Flux)과 코사인분포(Incident Neutral Flux)에서 모두 입자 수의 증가에 따라 상당부분 감소하였으나 처리시간은 이보다 더 증가하였다. 셀수와 거리의 증가는 오차율을 약간 증가시켰고 처리시간도 증가시켰다. 본 논문의 실험 결과를 통해 처리 시간을 고려하여 적합한 플럭스의 계산을 유추할 수 있다. In semiconductor etching simulation, The source modeling for generating plasma species is required. In this paper, we modeled the source of plasma etching process with probability distribution and the feature profile with simple geometry objects, then got the flux on the feature profile. The distance between the source and the cell on the modeling parameters of the source, there are a number of particles to be emitted from a source, there is a number (area of the cell) of the cell on the profile with additional parameters to give the calculation of flux. The flux error ratio on both gaussian(Incident Flux) and cosine probability distribution(Incident Neutral Flux) is much decreased as the number of ray is increased but the processing time is more increased than that. The increase of the number of cell and distance makes increase the flux error ratio and the processing time moderately. In view of the processing time through the experimental results in this paper, it is possible to analogize the calculation of appropriate fluxes.
Performance enhancement of Li-ion battery by laser structuring of thick electrode with low porosity
Park, Junsu,Hyeon, Seongsik,Jeong, Sungho,Kim, Hyeong-Jin Elsevier 2019 Journal of industrial and engineering chemistry Vol.70 No.-
<P><B>Abstract</B></P> <P>Increasing energy and power densities is one of the important required improvements in lithium ion batteries. However, there exist limitations in increasing both energy and power densities simultaneously because of the increase in internal resistance. In this work, we report the simultaneous improvement of these properties of lithium ion battery by adopting a laser structured LiNi<SUB>0.5</SUB>Mn<SUB>0.3</SUB>Co<SUB>0.2</SUB>O<SUB>2</SUB> cathode. The electrode was processed to make uniformly spaced micro-grooves by using a femtosecond laser. The performance of laser structured electrodes with varying thickness (100∼210μm) and porosity (26% and 50%) were compared with that of unstructured conventional electrodes used in industry. It is demonstrated that the specific energy of thick and dense laser structured electrode (thickness=175μm, porosity=26%) at 0.5C is about twice higher than that of thin and sparse unstructured electrode (thickness=100μm, porosity=50%) while rate capability is almost the same. Also, although laser-structured electrodes are much thicker than unstructured electrodes, the rate performance (discharge capacity=93%) of the laser-structured electrode is better than that of unstructured electrode at 1C. The simultaneous enhancement of the power and energy densities of the laser-structured electrodes results from the improvement of lithium ion diffusivity and cell polarization.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effects on laser structuring of thick and dense NMC cathode are investigated. </LI> <LI> Laser structuring enhanced the rate capability of the electrode at high current rate. </LI> <LI> Specific energy also increased, while improving or retaining the power density. </LI> <LI> Diffusion homogeneity and wettability were discussed for the performances. </LI> <LI> Diffusivity and polarization in the cell were analyzed in details. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>