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Oil/Water Separation Technology by MXene Composite Membrane: A Review (MXene 복합막에 의한 기름/물 분리 기술: 총설)

  • Lee, Byunghee;Patel, Rajkumar
    • Membrane Journal
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    • v.31 no.5
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    • pp.304-314
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    • 2021
  • Climate change results in unusual weather pattern and affects annual rain fall severely. At the same time, growing industrialization leads to higher energy demand and leakage from petrochemical industry and tanker leads to water pollution. In this scenario, finding out solution to generate clean water is highly essential. For oil/water separation, there are several methods available such as chemical precipitation and adsorption but membrane separation technique is considered to be a more cost and energy efficient process. Amphiphilicity nature of membrane are enhanced by making composite membrane with 2D material such as MXene, resulting in good electrical conductivity and hydrophilicity. This review is mainly classified into two sections: pure MXene and modified MXene. A variety of polymer is used to prepare composite membranes and MXene is modified to further enhance the properties suitable for particular applications.

A Study on Spacecraft Development Tool for the Development of the next Generation Satellite (차세대 위성개발을 위한 위성전자전산시스템 개발검증장비에 대한 연구)

  • Lee, Jae-Seung;Choi, Jong-Wook;Kang, Soo-Yeon;Chae, Dong-Seok;Lee, Jong-In
    • Proceedings of the Korea Information Processing Society Conference
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    • 2004.05a
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    • pp.1513-1516
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    • 2004
  • 선진국들은 위성개발을 위한 첨단기술의 개발 및 적용을 위한 연구가 지속적으로 이루어지고 있으며 실제 위성의 개발에도 직접적으로 적용하고 있다. 그러나 이러한 첨단 위성의 기술이전을 기피함에 따라 국내주도의 독자적인 차세대 위성의 개발이 필요하게 되었다. 국내에서도 우주개발 중장기계획에 따라 지구관측위성, 통신위성, 기상위성 등 다양한 위성개발이 추진되고 있으나, 새로운 위성의 설계, 제작, 조립 및 시험, 검증에는 많은 시설 및 장비가 필요하며 오랜 개발기간과 많은 예산이 소요된다. 이를 해결하기 위해 새로운 위성의 개발 시 선진국에서는 범용위성 개발 테스트베드를 제작하여 사전에 위성시스템을 모델링 및 검증함으로써 개발기간의 최적화, 개발예산의 최소화, 신기술의 적용 등에 활용하고 있는 추세이다. 국내의 경우, 현재 위성의 지상관제와 운용요원의 교육을 위해 위성시뮬레이터를 제작하여 활용하는 단계이며, 새로운 위성 개발을 위한 위성전자전산시스템 개발검증장비 및 활용기술에 대한 기반기술 확보를 위한 연구가 진행 중이다. 향후 다양한 위성임무에 대응한 위성의 개발기간 단축 및 비용절감과 첨단 위성전자시스템 및 부품기술의 사전 검증을 위해 위성전자전산시스템 개발검증장비에 대한 기반기술 확보가 필수적이다. 본 논문에서는 해외 위성선진국에서의 위성전자전산시스템 기술에 대해 살펴보고 현재까지 진행된 차세대 위성개발을 위한 위성시스템 개발검증장비의 설계에 대해 알아보고자 한다.

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A Convergence Implementation of Realtime Traffic Shaping and IPS on Small Integrated Security Router for IDC (IDC용 소형 통합보안라우터의 실시간 트래픽쉐이핑과 IPS의 융합 구현)

  • Yang, SeungEui;Park, Kiyoung;Jung, HoeKyung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.7
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    • pp.861-868
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    • 2019
  • Various server-based services such as big data, IoT and artificial intelligence have been made online. As a result, the demand for IDC to support stable server operation is increasing. IDC is a server-based facility with a stable line and power supply facility that manages 20 to 30 servers in an efficiently separated rack-level subnetwork. Here, we need a way to efficiently manage servers security, firewall, and traffic on a rack-by-rack basis. Including traffic shaping capabilities that control routers, firewalls, IPS, and line speeds, as well as VPN technology, a recent interest. If three or five kinds of commercial equipment are adopted to support this, it may be a great burden to the management cost as well as the introduction cost. Therefore, in this paper, we propose a method to implement the five functions in one rack-unit small integrated security router. In particular, IDC intends to integrate traffic shaping and IPS, which are essential technologies, and to propose the utility accordingly.

Usability of Project Finance with Sinking Fund (감채기금을 이용한 프로젝트 파이낸스의 유용성)

  • Han, Sang Jun
    • International Area Studies Review
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    • v.15 no.3
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    • pp.369-392
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    • 2011
  • A pure project finance is exposed to high default risk because it is made solely based on the business value of the project. Project finance with sinking funds can reduce the high default risk, in that it uses sinking funds to ensure the principal without requiring collaterals or guarantees. In view of economic efficiency, this paper analytically compares project finance with sinking funds to usual project finance and derives the condition for its superiority in corporate tax saving. Because sinking funds generate the repayments for the principal with compounding interest rates, in terms of effectiveness, project finance with sinking funds is suitable for long-term projects whose period is longer than 10 years. Pension funds can be good sources for project finance with sinking funds, since they should be managed to ensure stable investment returns for long periods.

Development of a Vehicle Positioning Algorithm Using Reference Images (기준영상을 이용한 차량 측위 알고리즘 개발)

  • Kim, Hojun;Lee, Impyeong
    • Korean Journal of Remote Sensing
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    • v.34 no.6_1
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    • pp.1131-1142
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    • 2018
  • The autonomous vehicles are being developed and operated widely because of the advantages of reducing the traffic accident and saving time and cost for driving. The vehicle localization is an essential component for autonomous vehicle operation. In this paper, localization algorithm based on sensor fusion is developed for cost-effective localization using in-vehicle sensors, GNSS, an image sensor and reference images that made in advance. Information of the reference images can overcome the limitation of the low positioning accuracy that occurs when only the sensor information is used. And it also can acquire estimated result of stable position even if the car is located in the satellite signal blockage area. The particle filter is used for sensor fusion that can reflect various probability density distributions of individual sensors. For evaluating the performance of the algorithm, a data acquisition system was built and the driving data and the reference image data were acquired. Finally, we can verify that the vehicle positioning can be performed with an accuracy of about 0.7 m when the route image and the reference image information are integrated with the route path having a relatively large error by the satellite sensor.

The Magnetic Anomaly Map of Korea (한국의 자력 이상도)

  • Park, Yeong-Sue;Rim, Hyoungrea;Lim, Mutaek;Shin, Young Hong
    • Geophysics and Geophysical Exploration
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    • v.22 no.1
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    • pp.29-36
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    • 2019
  • Regional airborne magnetic survey is very cost-effective mapping tool. Magnetic anomaly maps have abundant information, which are an important tool for understanding the geological evolution and mineral exploration. For this reason, the governments of many countries have made significant investment in the acquisition of airborne geophysical data over many decades. KIGAM (Korea Institute of Geoscience and Mineral Resources) began nationwide airborne magnetic mapping programme in 1982, and completed in 2017. The obtained magnetic data was reprocessed and magnetic database was built in 2018. In addition, the magnetic anomaly map of Korea with a scale of 1:1,000,000 was published. In this paper, we introduced a new magnetic anomaly map of Korea through describing the changing survey parameters during data acquisitions and history of data processing.

UAV Path Planning for ISR Mission and Survivability (무인항공기의 생존성을 고려한 감시정찰 임무 경로 계획)

  • Bae, Min-Ji
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.7
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    • pp.211-217
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    • 2019
  • In an complicated battlefield environment, information from enemy's camp is an important factor in carrying out military operations. For obtaining this information, the number of UAVs that can be deployed to the mission without our forces' loss and at low cost is increasing. Because the mission environment has anti-aircraft weapons, mission space is needed for UAV to guarantee survivability without being killed. The concept of Configuration Space is used to define the mission space considering with range of weapons and detect range of UAV. UAV must visit whole given area to obtain the information and perform Coverage Path Planning for this. Based on threats to UAV and importance of information that will be obtained, area that UAV should visit first is defined. Grid Map is generated and mapping threat information to each grid for UAV path planning. On this study, coverage conditions and path planning procedures are presented based on the threat information on Grid Map, and mission space is expanded to improve detection efficiency. Finally, simulations are performed, and results are presented using the suggested UAV path planning method in this study.

A Study on the Optimal Number of Air Tanker for Patrol Operations (초계작전을 위한 공중급유기 적정 대수 산정 연구)

  • Park, Sehoon;Chung, Ui-Chang;Chung, Je-Hoon
    • Journal of the Korea Society for Simulation
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    • v.28 no.1
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    • pp.57-65
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    • 2019
  • Air refueling is expected to increase the efficiency of the air force operations. This follows from the introduction of air refueling aircraft, which should to increase operational time by increasing the range and duration of fighter jets. Despite the effectiveness of the air refueling air crafts, the astronomical costs of adapting the air tankers call for careful discussions on whether to acquire any air craft and if so, how many. However there is no academic study on the subject to our knowledge. Thus, we use the ABM(Agent Based Modeling) technique to calculate the optimal number of air tankers during patrol operation. We have enhanced the reliability of the simulation by entering the specifications of the current aircraft operated by the Korean Air Force. As an optimization tool for determining the optimal number of counts, we use OptQuest built into the simulation tools and show that the optimal number of air tanker is 4.

Enhancement of a Secure Remote Working Environment using CloudHSM and edge-DRM Proxy (Cloud HSM와 edge-DRM Proxy를 활용한 안전한 원격근무 환경 강화 연구)

  • Kim, Hyunwoo;Lee, Junhyeok;Park, Wonhyung
    • Convergence Security Journal
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    • v.21 no.3
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    • pp.25-30
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    • 2021
  • Due to the current COVID-19 pandemic, companies and institutions are introducing virtual desktop technology, one of the logical network separation technologies, to establish a safe working environment in a situation where remote work is provided. With the introduction of virtual desktop technology, companies and institutions can operate the network separation environment more safely and effectively, and can access the business network quickly and safely to increase work efficiency and productivity. However, when introducing virtual desktop technology, there is a cost problem of high-spec server, storage, and license, and it is necessary to supplement in terms of operation and management. As a countermeasure to this, companies and institutions are shifting to cloud computing-based technology, virtual desktop service (DaaS, Desktop as a Service). However, in the virtual desktop service, which is a cloud computing-based technology, the shared responsibility model is responsible for user access control and data security. In this paper, based on the shared responsibility model in the virtual desktop service environment, we propose a cloud-based hardware security module (Cloud HSM) and edge-DRM proxy as an improvement method for user access control and data security.

Parts Management Method for Weapon System Parts Standardization (무기체계 부품 표준화를 위한 부품관리 방안)

  • Jung, Hyun-Woo;Shim, Bo-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.22 no.2
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    • pp.409-417
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    • 2021
  • The standardization of weapon system parts is one of the elements of parts management and is an important factor for reducing the cost of acquiring and maintaining a weapon system, enhancing its reliability, improving interoperability, alleviating parts obsolescence problems, improving logistics efficiency, and strengthening the military's combat readiness. This study examined how to manage parts of domestic R&D weapon systems, overseas imports weapon system parts, and various commercial parts from a standardization perspective, and to study parts management methods for standardizing parts in the future. This system was used to achieve systematic part standardization in a military weapon system. To this end, this study investigated what elements are used to standardize weapon system parts. The importance and weight of each element were calculated using the AHP (Analytic Hierarchy Process), one of the decision-making techniques, and the design stage standards using the part selection method were studied. Through this, the selection process of standard parts, which has been made according to the experience and subjective judgment of designers and personnel, was improved to propose a systematic and objective method of standardizing weapons parts.