https://oak.chosun.ac.kr/handle/2020.oak/19143 2025-08-20T07:46:11Z 2025-08-20T07:46:11Z 조현주 https://oak.chosun.ac.kr/handle/2020.oak/19318 2024-05-13T07:28:41Z 2018-12-31T15:00:00Z

Title: 개발단계 데이터를 활용한 무기체계 소프트웨어의 신뢰도 분석 연구 Author(s): 조현주 Abstract: Software reliability is one of the most important elements of quality. As the proportion of software in the system increases, the importance of analysis for software reliability is also increasing. In particular, weapon system software in the defense domain requires higher reliability. Therefore, the reliability of software in the development of weapon systems should be strictly analyzed and managed quantitatively However, the conventional reliability analysis of weapon system software is only static analysis at the code level. Therefore, this paper proposes a more systematic and quantitative analysis method for reliability of weapon system software. By showing the actual results applied to OO weapon system development, we can verify the practicality of the analysis model.

2018-12-31T15:00:00Z Hee-Seon Jang Jang Hyun Baek https://oak.chosun.ac.kr/handle/2020.oak/19320 2024-05-13T07:28:41Z 2018-12-31T15:00:00Z

Title: Performance Analysis of Distance-based Registration with 4-Directional Mobility Model Author(s): Hee-Seon Jang; Jang Hyun Baek Abstract: In this study, we consider a 4-directional mobility model applicable in the metropolitan area to calculate the number of location registrations per mobile station (MS) for the zone-based (ZBR) and distance-based (DBR) registration schemes. The number of location registrations between two incoming calls are obtained mathematically assuming that the MSs are uniformly distributed in the location area (LA), and the mathematical results are verified through computer simulations. The comparison between analytical results and computer simulations shows that, in ZBR, MSs are uniformly distributed in the LA after turning, but they are not uniformly distributed in LA for DBR. It is also observed by computer simulations that, when the moving distance between turning points is smaller compared to the distance between incoming calls or LA’s radius, DBR outperforms ZBR in most cases.

2018-12-31T15:00:00Z Yongdeok Jo Xue Lib Dongmin Choc Byung-Sang Choib https://oak.chosun.ac.kr/handle/2020.oak/19321 2024-05-13T07:28:42Z 2018-12-31T15:00:00Z

Title: Tensile properties of three-dimensionally interconnected graphene-networked Cu composite and changes in its microstructure in relation to heat treatment temperature Author(s): Yongdeok Jo; Xue Lib; Dongmin Choc; Byung-Sang Choib Abstract: An investigation of microstructure changes in a new, in situ-fabricated, three-dimensionally interconnected graphene-networked Cu composite was performed in relation to the heat treatment temperature in H2 and in air. Heat-treated in H2 revealed that recrystallization commenced at ~ 300 ℃ and the crystal grew afterward. However, the crystal growth was constrained within the initial Cu grains and inhibited due to Cu grains being wrapped by the stable graphene, even at 1000 ℃. This resulted in similar or narrower grain-size distribution. Meanwhile heat treatment in air resulted in the oxidation of carbon, instability of graphene, and crystal growth over the grain boundaries, which resulted in a wider grain-size distribution. Increases in tensile and plastic deformation (30% and 144%, respectively) were observed due to the grain size refinement and the strong interfacial bonds between graphene and the Cu matrix. The result was greater load bearing and toleration of a substantial load during plastic deformation.

2018-12-31T15:00:00Z 김성근 임대윤 정성용 https://oak.chosun.ac.kr/handle/2020.oak/19319 2024-05-13T07:28:41Z 2018-12-31T15:00:00Z

Title: 모의 분사 시스템을 이용한 농업용 드론의 저비용 분사성능 평가 방안 Author(s): 김성근; 임대윤; 정성용 Abstract: In recent years, unmanned aerial vehicles (UAVs) also known as drones have been employed in an agricultural field. Although spray systems have been well developed for general agricultural applications, there are no researches about the spray system for the agricultural drone. In addition, high cost is required to evaluate the spray performance of agricultural drones. In this study, we developed a simulated spray system and an evaluation method for the spray performance of agricultural drones. With a digital image processing, the spray performance was evaluated based on the coefficient of variation and the effective spraying width was calculated. The developed system was verified by on-site test using an evaluation method similar to Foundation of Agricultural Tech Commercialization and Transfer (FATCT). The results of the developed system agree well with that from a field test. The developed system would be useful for designing and evaluating spraying systems for agricultural drones.

2018-12-31T15:00:00Z