• 한국지능시스템학회논문지
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• 제23권6호
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• pp.577-582
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• 2013

In this paper, the state-of-the-art IVEF Service based on e-Navigation System was represented. The unification of the data exchange format among maritime-related systems is one of vital user-needs of e-Navigation, advantageous in bringing maritime safety and security. This paper propose the method to exchange marine information in IVEF, as recommended by the IALA, between VTS centers and Korea's GICOMS as well as the government-related agencies. To achieve this, a system data flow was designed which it acts as client and server. It enables the sending and receiving of Radar and CCTV images in accordance with the IVEF recommendation document of IALA.

• 유변학
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• 제10권3호
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• pp.131-136
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• 1998

아역청탄을 이용하여 제조된 CWM(Coal-Water Mixture)연료의 유변학적 특성을 측 정함으로써 음이온 계면활성제 Temol-N, 안정제 Xanthan 및 전해질 등의 첨가제에 대한 성능을 평가하고 최적첨가조성을 결정하였다. 계면확성제의 흡착으로 인해 석탄입자는 음전 하를 띠게 되었고 표면에 전기이중층이 생성되었다. 전기 이중층의 전기적 반발력이 입자의 응집을 막았고 CWA 슬러리의 점도를 감소시켰다. 또한 Xanthan과 NaOH의 첨가로 인해 분산안정성 및 침강안정성이 향상되는 것을 관찰하였다. CWM에서 석탄입자가 차지하는 부 피비를 무게비로 전환하여 표현하고 분산계에서 입자의 부피비에 따른 점도변화를 예측하는 실험식인 Krieger-Dougherty 식과 Frankel-Acrivos 식에 적용하였다. 점도 실험값을 가지 고 식의 변수들을 결정해 본결과 CWM이 나타내는 점도의 석탄함량에 따른 변화를 위 식 들이 비교적 정확시 나타내 주는 것을 확인하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2013년도 춘계학술대회
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• pp.398-400
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• 2013

해상교통관제(VTS; Vessel Traffic Service)는 IMO RESOLUTION A.857(20) on Guidelines for Vessel Traffic Service와 해사안전법 제36조, 개항질서법 제 28조에 의거 해상운송에서의 위험을 감소하고 해상교통질서확립과 안전확보를 위하여 전세계 주요항만 및 수역에서 이용되고 있다. 최근 해상교통관제 분야에 인적요인을 도입하여 사고예방 및 감소를 도모하고 있으나 해상교통관제의 특수한 상황을 충분히 고려하지 못하고 있다. 따라서 본 연구에서는 해상교통관제와 해상교통관제사의 특수한 업무상황을 고려하여 직무를 분석하고 인간공학적 분석기법을 적용하여 사전해상상황인식을 위한 관제업무의 예측모듈을 개발하는데 목적이 있다. 본 연구를 통하여 체계적인 관제업무 분석의 프레임을 제공하고 관제사들이 효율적으로 관제업무를 수행하도록 하기 위한 실무적 업무프로세스를 제시한다.

• Journal of Information Technology Applications and Management
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• 제19권4호
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• pp.1-18
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• 2012

This paper identifies technology trends of national research and development (national R&D) by exploiting Korean national R&D patents, ranging from 2007 to 2010. In this paper, co-word analysis (CWA), which is a method to identify the relationship among technology terms by using their co-occurrences, is incorporated into network analysis to visualize the relationships among technology keywords of national R&D patents and calculate network indexes concerning inter-relationship diversity and strength of technology keywords. As a result, this research found that inter-relationship among technology keywords in national R&D are getting increasingly strengthening in an overall sense. In addition, the keyword inter-relationship diversity-strength map proposed in this paper revealed some significant technological keywords of national R&D : core technology keywords including "sensor", "film" and "fuel" and emerging keywords including "biosensor" and "thermoelectric". Because the proposed approach helps identify interdisciplinary trends of technology keywords from a massive volume of national R&D patents in a visual and quantitative way, we expect that the approach can be incorporated as a preliminary into the R&D planning process to assist R&D policy makers to understand technology convergence of national R&D and develop relevant R&D policies.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제13권4호
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• pp.315-323
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• 2013

Vessel Traffic Service (VTS) is being used at ports and in coastal areas of the world for preventing accidents and improving efficiency of the vessels at sea on the basis of "IMO RESOLUTION A.857 (20) on Guidelines for Vessel Traffic Services". Currently, VTS plays an important role in the prevention of maritime accidents, as ships are required to participate in the system. Ships are diversified and traffic situations in ports and coastal areas have become more complicated than before. The role of VTS operator (VTSO) has been enlarged because of these reasons, and VTSO is required to be clearly aware of maritime situations and take decisions in emergency situations. In this paper, we propose a prediction table to improve the work of VTSO through the Cognitive Work Analysis (CWA), which analyzes the VTS work very systematically. The required data were collected through interviews and observations of 14 VTSOs. The prediction tool supports decision-making in terms of a proactive measure for the prevention of maritime accidents.

• 공업화학
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• 제30권5호
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• pp.513-522
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• 2019

유기물질, 전이금속 및 유기-금속 구조체(MOFs)를 기반으로 하는 촉매들이 유기인 계열 독성물질들을 분해하고 제거하는데 효과적임이 보고되어 왔다. 최근 20년간 독성물질 분해연구를 위해 다공성 MOFs들이 응용 목적에 맞게 디자인되고 합성되었다. $Zr_6$ 기반의 금속노드와 유기결합체를 가지는 MOFs들은 세공크기, 공극률, 표면적, Lewis acidic 자리 그리고 열적 안정성 등과 같은 기본구조내의 변형이 가능하기 때문에 화학작용제, 살충제 및 제초제를 제거하는 촉매로 널리 사용되어왔다. 본 리뷰에서는 구조, 안정성, 입자크기, 연결된 리간드 수, 유기 기능기 등에 따른 MOFs들의 촉매효율과의 연관성을 다루게 될 것이다.

• 센서학회지
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• 제28권3호
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• pp.139-145
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• 2019

Precautionary detection of chemical warfare agents (CWAs) has been an important global issue mainly owing to their toxicity. To achieve proper detection, many studies have been conducted to develop sensitive gas sensors for CWAs. In particular, metal-oxide semi-conductors (MOS) have been investigated as promising sensing materials owing to their abundance in nature and excellent sensitivity. In this review, we mainly focus on various MOS-based gas sensors that have been fabricated for the detection of two specific CWA simulants, 2-chloroethyl ethyl sulfide (2-CEES) and dimethyl methyl phosphonate (DMMP), which are simulants of sulfur mustard and sarin, respectively. In the case of 2-CEES, we mainly discuss $CdSnO_3-$ and ZnO-based sensors and their reaction mechanisms. In addition, a method to improve the selectivity of ZnO-based sensors is mentioned. Various sensors and their sensing mechanisms have been introduced for the detection of DMMP. As the reaction with DMMP may directly affect the sensing properties of MOS, this paper includes previous studies on its poisoning effect. Finally, promising sensing materials for both gases are proposed.

• 한국농림기상학회지
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• 제19권2호
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• pp.37-42
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• 2017

본 연구에서는 RCP 8.5 기후변화 시나라오를 바탕으로 온량지수와 쾨펜의 기후구분을 통한 우리나라의 기후지대 변화를 살펴 보았다. 그 결과, 온량지수에 의한 기후지대를 구분하였을 경우 21세기 후반으로 갈수록 기온이 증가하여 전국적으로 난온대의 기후특성이 나타날 것으로 예상되었으며, 쾨펜의 기후지대 구분에서는 기온의 꾸준한 증가와 강수량의 연중 빈도 차이에 의해 Cfa와 Cwa의 기후특성이 주로 나타날 것으로 예상된다.

• 한국군사과학기술학회지
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• 제23권3호
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• pp.302-309
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• 2020

Early-detection and monitoring of toxic chemical gas cloud with chemical detector is essential for reducing the number of casualties. Conventional method for chemical detection and reconnaissance has the limitation in approaching to chemically contaminated site and prompt understanding for the situation. Stand-off detector can detect and identify the chemical gas at a long distance but it cannot know exact distance and position. Chemical detection UAV is an emerging platform for its high mobility and operation safety. In this study, we have conducted chemical gas cloud detection with the stand-off chemical detector and the chemical detection UAV. DMMP vapor was generated in the area where the cloud can be detected through the field of view(FOV) of stand-off chemical detector. Monitoring the vapor cloud with standoff detector, the chemical detection UAV moved back and forth at the area DMMP vapor being generated to detect the chemical contamination. The hybrid detection system with standoff cloud detection and point detection by chemical sensors with UAV seems to be very efficient as a new concept of chemical detection.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.148.2-148.2
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• 2013

We prepared hydrophobic PDMS-coated porous silica as pre-concentration adsorbent for chemical warfare agents (CWAs). Since CWAs can be harmful to human even with a small amount, detecting low-concentration CWAs has been attracting attention in defense development. Porous silica is one of the promising candidates for CWAs pre-concentration adsorbent since it is thermally stable and its surface area is sufficiently high. A drawback of silica is that adsorption of CWAs can be significantly reduced due to competitive adsorption with water molecule in air since silica is quite hydrophilic. In order to solve this problem, hydrophobic polydimethylsiloxane (PDMS) thin film was deposited on silica. Adsorption and desorption of chemical warfare agent (CWA) simulants (Dimethylmethylphosphonate, DMMP and Dipropylene Glycol Methyl Ether, DPGEM) on bare and PDMS-coated silica were studied using temperature programed desorption (TPD) with and without co-exposing of water vapor. Without exposure of water vapor, desorbed amount of DMMP from PDMS-coated silica was twice larger than that from bare silica. When the samples were exposed to DMMP and water vapor at the same time, no DMMP was desorbed from bare silica due to competitive adsorption with water. On the other hand, desorbed DMMP was detected from PDMS-coated silica with reduced amount compared to that from the sample without water vapor exposure. Adsorption and desorption of DPGME with and without water vapor exposing was also investigated. In case of bare silica, all the adsorbed DPGME was decomposed during the heating process whereas molecular DPGME was observed on PDMS-coated silica. In summary, we showed that hydrophobic PDMS-coating can enhance the adsorption selectivity toward DMMP under humid condition and PDMS-coating also can have positive effect on molecular desorption of DPGME. Therefore we propose PDMS-coated silica could be an adequate adsorbent for CWAs pre-concentration under practical condition.