While numerous anomalies and failures of spacecraft have been reported since the beginning space age, weather effects on modern systems emphasized more with increase their complexity capability. However, relationship between commercial satellite has not studied extensively. In this paper, we investigate geostationary Earth orbit (GEO) archived by Satellite News Digest during 1997–2009 in order to search for possible influences anomaly occurrences. We analyze Kp index, local time, season then...

In this study, we report the precise shape control of crystalline cerium oxide, whose morphology changes between nanorods and nanoparticles in a short time. The proposed synthetic route oxide was highly dependent on reaction time, 10 min determined to be optimum condition. were further converted into by spontaneous assembly nanorods. transmission electron microscopy results showed that synthesized grew with high crystallinity along 〈110〉 direction. have been proven very efficient mediators...

The goal of this study is to conceptually orientate optimized layouts outrigger belt trusses which are in widespread use today the design tall buildings by strut-and-tie truss models utilizing a topology optimization method. In unknown realized using typical SIMP method methods. tradition model designs find appropriate along force paths with respect elastic stress distribution, and then engineers or designers determine most proper experience intuition. It linked trial-and-error procedure...

In this paper, we present the impact of hot carrier injection (HCI) during programming operation in NAND Flash, and describe how HCI degrades reliability characteristics. order to understand degradation induced by HCI, evaluated characteristics under various stress conditions including number disturbance pulses, pulse shapes temperatures. We have concluded that boosting bias should be carefully optimized reduce HCI.

Mobile operators are providing mobile data services through numerous Wi-Fi access points (APs). In such a wireless network, when devices select APs, recent works only consider to provide guarantee QoS (Quality of Service), however, they ignore the backhaul link limitations which refers between AP and backbone routers. Therefore, even if there exist many APs satisfying QoS, selects specific AP, thus, creating congestion on AP's link. we propose novel selection scheme that classifies traffic...

Due to environmental issues and depletion of resources, global attentiveness in electric vehicles (EVs) is growing. In particular, research on high specification motors for driving large EVs has attracted a lot attention. this study, an analysis design process motor that can be universally applied heavy reduce pollution was introduced. Motors require specifications. Thus, interior permanent magnet synchronous (IPMSM) with delta-shaped array used improve the torque power characteristics. A...

Purple fringing is an undesirable artifact in digital camera. This paper proposes a new purple correction method using colorization Yxy color space. In the proposed method, chromaticity diagram based first used to detect fringed region, and then this region corrected by colorization. Colorization effective for correcting fringing. The colors of intact pixels near are set those seed pixels. Experimental results show that regions, which look more natural human observers than other existing methods.

This study shows how uncertainties of data like material properties quantitatively have an influence on structural topology optimization results for dynamic problems, here such as both optimal and shape. In general, the may result in behaviors deflection or stress analyses. Therefore solutions naturally depend behaviors, since estimated by analysis method FEM need to execute procedures. order estimate effect a so-called interval is utilized this study, it well-known non-stochastic approach...

Recently, various micro air vehicles have drawn significant attention in numerous areas including surveillance and reconnaissance. The manual control of is very difficult due to their smaller profile; therefore, a stability controllability augmentation system minimum requirement for stable efficient flight. However, it not easy obtain an accurate numerical model the flight dynamics design system. An alternative approach systems incorporate reinforcement learning order address complexity....

This paper presents a technique to reduce the ghost artifacts in high dynamic range (HDR) image.In HDR imaging, we need detect motion between multiple exposure images of same scene order prevent artifacts.First, establish correspondences aligned reference image and other using zero-mean normalized cross correlation (ZNCC).Then, find object regions adaptive local thresholding ZNCC feature maps map clustering.In this process, focus on finding accurate reducing false detection minimize side...

In this study, a new nodal–based distribution method of material properties is proposed for topology optimization in linear elastostatic structures. It based on design domain concept density (Bendsøe, 1989). Nodal densities are considered as variables. Geometric boundaries represented by fixed grids, thus an Eulerian type formulation used optimal interfaces. The objective to obtain both smooth shapes and topologies the avoiding excessive number finite elements. This approach allows us...

Countries are looking for a pathway toward sustainable transition from fossil-based to less or zero-carbon sources in energy sector order reduce its impact climate change. Among different renewable resources, photovoltaic power system (PV) is considered as one of the most promising technology, which has biggest potential increasing energy. However, profit can be varied depending on operation and management, possibly causes performance degradation safety issues due faults. Therefore, we have...

Electric vertical takeoff and landing (eVTOL) vehicles can be employed to rescue individuals stranded in elevated locations inaccessible conventional fire ladders. Conventional eVTOL face challenges the performance of long-endurance repetitive missions due limitations onboard battery capacity. Thus, integrating a tethered flight system vehicle is necessary. In this study, preliminary design heavy-lift multicopter for human was implemented according an existing with proven performance. A...

The shaded pole induction motor is simply a selfstarting single-phase whose one of the poles by copper ring. Even though it has poor efficiency and starting torque very low, widely used, because low cost easy starting. motors used in cooling fans refrigerators are generally well but areas where power supply unstable, sometimes leads to faults such as coil disconnection. In this paper, fan load tests locked rotor were performed order determine operation status overvoltage conditions. Through...

Considerable research has been dedicated to synthetic ammonia production for hydrogen energy carriers as well fertilizer constituents. However, the intensive demanding of Haber-Bosch process have raised concerns. Electrochemical synthesis emerges a promising alternative, with efficacy electrochemical catalyst being paramount. Bismuth, renowned its ability forge robust bonds nitrogen owing p-electrons, exhibited potential this process. These characteristics enable not only adsorption but also...

This study experimentally shows that an oscillatory behavior observed in a trim flight of ornithopter has stable limit-cycle oscillation (LCO) characteristics and the magnitude LCO body pitch dynamics can be suppressed by active tail motion. A free tested is emulated wind tunnel using specially devised tether provides minimal mechanical interference to ornithopter. Due symmetric wing motion forward flight, longitudinal more focused than lateral one. The non-contact type sensors are used...

With the increment in energy consumption, distributed systems are mandatory required for commercial and residential areas, leading to rapid increase fuel cell demand. Yet lack of safety standards exclusively a solid oxide (SOFC) system is rife currently. Especially, it inevitable number exhaust holes flues, because use one independent pipe per single SOFC regulated based on current law. In present study, evaluation was performed an integrated using hazard operability study (HAZOP), which...

라디칼 회분식 반응 공정을 사용하는 있는 중 소규모 화학공장의 경우, 취급 물질, 작업 내용 및 제품 등의 여러가지 상황 변화에 따른 잠재적인 화재, 폭발 안전의 위험성이 상존해 있다. 이러한 화학공장에서 마주치는 위험성에 대하여, 정성적인 위험성 평가 분석을 위하여 대표적으로 많이 사용되는 평...

We report the impact of plasma edge damage on erase characteristics in NOR Flash cells where channel is employed. Anomalous over-erased bits were observed, and they appeared to be associated with creation positive traps near floating gate tunneling oxide layer during etch process. By examining possible processes analyzing characteristics, we have concluded that cause anomalous behavior. Since size damaged region does not decrease as stacked length scaled down, foresee this defect a serious...

A refrigerator has many components which are made from diverse materials such as metal, polymer, plastic, and rubber. So, it generally requires much time efforts to build up an analysis model in finite element analysis. In this work, reduce the computational a simplified modeling method was proposed for of refrigerator. Occasionally, stick-slip noise occurs due relative slip between shelf inner-case. When we solve problem by FE analysis, should structures with detail considering contact...