• Journal of Advanced Navigation Technology
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• v.27 no.5
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• pp.534-539
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• 2023

Currently, in Korea, to obtain a jet type rating, you must receive training on a small business jet model. The reason is because of the law in the Aviation Safety Act Enforcement Rules 『Appendix 4』 that states, "You must receive at least 2 hours of flight training." In the end, it is acquiring type rating as a small business jet aircraft with relatively low operating costs. The qualifications acquired in this way are different from those for aircraft operated by airlines. However, if you have an initial jet type rating, you can acquire an airline aircraft qualification just by training on a simulator, so airlines want you to have at least a small-jet type rating. However, in the United States and Australia, there is a system in place to acquire initial jet type rating through simulator training without actual flight training.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2011.04a
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• pp.299-299
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• 2011

In this study, transonic aeroelastic response analyses have been conducted for the business jet aircraft configuration considering shockwave and flow separation effects. The developed fluid-structure coupled analysis system is applied for aeroelastic computations combining computational structural dynamics(CSD), finite element method(FEM) and computational fluid dynamics(CFD) in the time domain. It can give very accurate and useful engineering data on the structural dynamic design of advanced flight vehicles. For the nonlinear unsteady aerodynamics in high transonic flow region, Navier-Stokes equations using the structured grid system have been applied to wing-body configurations. In transonic flight region, the characteristics of static and dynamic aeroelastic responses have been investigated for a typical wing-body configuration model. Also, it is typically shown that the current computation approach can yield realistic and practical results for aircraft design and test engineers.

• International Journal of Quality Innovation
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• v.10 no.2
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• pp.19-27
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• 2009

This paper considers the short term fleet scheduling problem as described by Keskinocak and Tayur (1998). Fleet scheduling may directly affect the service quality of fractional jet aircraft business. The contributions of this paper are two: (i) we show how their model is easily implemented in a standard modeling language, LINGO, and (ii) an alternate formulation is given which is expected to perform better on large, difficult problems.

• Journal of Ocean Engineering and Technology
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• v.35 no.6
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• pp.403-413
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• 2021

As the size of ships increases, the size and output power of their thrusters also increase. When a large ship berths or unberths, the jet flow produced from its thruster has an adverse effect on the stability of quay walls. In this study, we conducted a numerical analysis to examine the impact of the thruster jet flow of a 30,000 TEU container ship, which is expected to be built in the near future, on the stability of a quay wall. In the numerical simulation, we used the fluid-structure interaction analysis technique of LS-DYNA, which is calculated by the overlapping capability using an arbitrary Lagrangian Eulerian formulation and Euler-Lagrange coupling algorithm with an explicit finite element method. As the ship approached the quay wall and the vertical position of the thruster approached the mound of the quay wall, the jet flow directly affected the foot-protection blocks and armor stones. The movement and separation of the foot-protection blocks and armor stones were confirmed in the area affected directly by the thruster jet flow of the container ship. Therefore, the thruster jet flows of ultra-large ships must be considered when planning and designing ports. In addition, the stability of existing port structures must be evaluated.

• Applied Chemistry for Engineering
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• v.34 no.5
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• pp.472-478
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• 2023

The usage of jet fuel has been increasing with increasing passenger and logistics movements under globalization. CO₂, which is the main global warming gas from aircraft, was charged about 3.5% of total global CO₂ emissions and 12% of transportation fuel emissions. For these reasons, a lot of governments and the international civil aviation organization (ICAO) are trying to reduce CO₂ emissions via the introduction of bio-jet fuel. In this paper, we showed the jet fuel properties, specifications, and presentative production methods of bio-jet fuel such as alcohol to jet (ATJ), oil to jet (OTJ), gas to jet (GTJ) and sugar to jet (STJ). Also, we described the status of global and domestic bio-jet fuel usage and the policy plan for efficient distribution.

• Journal of Applied Reliability
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• v.15 no.3
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• pp.154-162
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• 2015

We have performed accelerated photo-degradation test using a 10-Sun level high irradiance $Weather-Ometer^{(R)}$ (10-Sun Ci5000) in an attempt to study acceleration and correlation between accelerated and service conditions for ink-jet ink. The accelerated test was used to predict lifetimes of ink-jet ink through the calculation of scaling factor for intensity of irradiance and duration of usage combined with estimation of lifetime distribution and inverse power model as a life-stress model. The lifetimes and acceleration factors for foreign and domestic inks were compared with each other. The results showed that the failure mechanisms and life-stress models for ink-jet ink were different among the color of ink which means that we might be in need of further study by color of inks.

• Proceeding of EDISON Challenge
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• 2012.04a
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• pp.89-92
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• 2012

초음속 항공기를 설계하는데 있어서 일반적인 항공기와는 다른 성능이 요구되는데 그것은 바로 초음속에 의한 충격파가 발생시키는 추가적인 항력을 감소시키는 일이다. 날개의 Airfoil 형상을 결정하기 위해서는 공력 특성을 파악해야 하는데, 이를 알아보는 데 있어서 EDISON_CFD를 사용하였다. 충격파의 생성을 지연시키는 Supercritical Airfoil의 여러 형상에 필요한 격자를 생성하여 비점성, 압축성 유동 해석을 수행하였다. 비교에 필요한 다섯 개의 NASA Supercritical Airfoil을 선정하여, 아음속과 초음속으로 나누어 받음각에 따른 양력계수와 항력계수를 도출하고, 이를 토대로 양항비를 추정해 보았다. 추려진 것 중 가장 우수한 공력성능을 보이는 airfoil을 선정하였는데 그 결과 NASA SC-0403 airfoil의 공력 성능이 가장 뛰어나 그것을 선정하기로 하였고, 또한 2차원 공력 해석에서 얻은 양력계수를 면적에 대하여 적분하여 날개에서의 양력과 항력을 추정하였다.

• Journal of the Speleological Society of Korea
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• no.64
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• pp.37-48
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• 2004

Many merchants have dealed in the salted shrimps(Saewoo -Jet) in Kwangcheon. They made the soil cave at headland on beach, so aged Saewoo-Jet in casks in soil cave with fitting temperature($13\~15^{circ}C$ and humidity($85\%$). Kwangcheon where it is gathering and scattering around the country have gained fame in its tastes and the freshness in Korea. Yu Myoun Won made the fresh starts Put it in this cave. Since 1949, the soil cave is used all the time. Ultimately this was getting warehouse business put the salted shimps since 1960. Today, this business is going down, and this warehouse is used for only the aged Period. As the alternative plan, many merchants focus on various fastivals, Saewoo-Jet special area plan, vessel improvement etc, and makes a wish to good sales. Folkway are Guldeagum-Je that they has done before digging the cave, Anteak(sods that care the family dwell in the house) and the October sacrifice have done on Gasin-Je in the soil cave. This cave has used as the refrigator when Saewoo-Jet come in the cave.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.21 no.5
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• pp.459-464
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• 2008

While high speed / precision investigating for maximization of Textile Machinery business is requesting a machine which has highly endurance, stability and reliance abilities following customer request. In this research, load volume that gives influence on loom is measured and analyzed for water jet loom in real operation time to driving system adhered torque sensor to each a module. As well, measurement and analysis technology are developed about torque and vibration of driving systems for textile machinery by comparing dynamical analysis of water jet loom with gained result, basic materials about development of high value added textile machinery which has endurance and stability are presented.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.39-42
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• 2007

Since the scalability of OLED process is crucial factor for large-sized TV manufacturing, various technologies are reviewed based on the published information. Despite of recent technology advancement enabling high color purity, large-sized AMOLED, a lot of problems to solve still exist to enter the large-sized display market. Here, Samsung will discuss what has to be concerned for large panel and how far the OLED technologies need to go more for the large-sized AMOLED TV marketplace.