• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.10 no.6
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• pp.535-544
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• 2017

In this paper, to overcome the limitation of information transmission and reception according to the RF system of UAV, it is necessary to check the position of many UAVs in flight on the basis of mobile communication and to make the LTE modem lightweight and low power And UAVs that are in operation are received and controlled. Through this study, we proposed a method to control real-time location tracking by connecting high-resolution images to the network anytime and anywhere. For this purpose, we propose the requirements and requirements of LTE modem using real-time high-speed data communication technology (3G, 4G LTE, Bluetooth) by presenting the communication module system of LTE-based UAV. N:N control system concept and implementation technology(Control system structure, control data flow chart, flight planning and transmission, real-time location tracking).

• Journal of Information Technology and Architecture
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• v.9 no.1
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• pp.33-42
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• 2012

Present many organizations are introduced to smartwork for reducing the operational cost and getting the labor's flexibility. The smartwork is the future-oriented worker's environment in which they can engage in their task, anytime and anywhere conveniently and efficiently. In spite of many smartwork advantages, the security problems are major issues and prevent to introducing and spreading of smartwork for organizations. Therefore, the success of the organization for smartwork environment is put in place appropriate security control model. This study is about security threats for smartwork security control model. We apply the exploratory method for this research, which are reviewing, analyzing of literature for extracting the security threats and clustering of the extracted security threats. Finally we define the 16's security threats according to the aspect of smartwork service layers.

• Journal of the Korea Institute of Military Science and Technology
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• v.13 no.5
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• pp.903-909
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• 2010

ADAS is the air defense control system performing air surveillance and identification of ROK and near air. This system is self-developed by Air Force, currently operated successfully as the alternative system of MCRC. ADAS processes converting and combining transferred the real time radar data detected by radars. additionally, it displays significant radar data as producing in tracks. Then, it uses the message queue for IPC(Inter Process Communication). the various tactical data processed in the server is ultimately send to the network management process through the message queue for transmitting to the weapon director console. the weapon director receives this transmitted tactical data through the console to execute air defense operations. However, there is a problem that data packet is delayed or lost since the weapon Director does not receive as the amount of tactical data from the server overflowed with air tracks and missions increased. This paper improved the algorism to display and transmit the various tactical data processed from ADAS server to numbers of the weapon director console in the real time without any delay or lost. Improved the algorism, established at exercise, the development server in the real operation network and the weapon director console, is proved by comparing the number of sending tactical data packets in the server and receiving packets in the weapon director.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 1999.10a
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• pp.199-206
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• 1999

본 연구에서는 웹기반의 화물차량위치추적시스템의 개발과 관련된 문제를 다루고 있다. 화물위치추적 시스템이란 이동하는 화물차량으로부터 위치데이터 및 관련 정보를 수신하여 중앙관제센터에서 이 정보를 데이터베이스에 저장하여 두고 화물위치 정보를 지도 위에 표시하는 시스템으로 화주, 운송회사 등 육상물류관련 기관에서 화물위치추적, 공동수배송, 화물차량 통제 등 다양한 목적으로 사용될 수 있다. 화물차량위치추적시스템은 AVLS(Automatic Vehicle Location System)라 불리우면서 산업계에서 활용되고 있으며 위치획득 방법의 종류에 따라 다양한 유형의 AVLS모델이 등장하고 있다. 예를 들면 전통적인 GPS(Global Positioning System) 위성 수신, DGPS(Differential GPS) 기지국, PCS(Personal Communication System) Cell, 도로기반 시설에 포함되는 비콘 등의 방법에 의해 AVLS는 구현되고 있다. AVLS는 정보통신 요소 기술과 정보통신 기반 시설로 구성되는데, 정보통신 요소기술로는 위치획측의 매개체인 AVL단말기와 관제시스템 S/W. 그리고 GIS(Geographic Information System)가 있고, 정보통신 기반 시설로는 차량의 단말기와 관제시스템 사이의 데이터 중계를 담당하는 네트워크가 있다. 화물차량위치추적시스템을 구성하기 위한 구비요건으로 중계망의 안정성과 신뢰성, 획득한 위치데이터의 정확성, 관제시스템의 완성도와 AVL단말기의 사용자 인터페이스, GIS S/W개발을 위한 Map API(Application Program Interface)등을 들 수 있다. 본 연구에서는 PCS Cell 방식에 의한 위치결정방식을 채택하였는데, 이것은 PCS망을 기반으로 데이터를 주고받이며 인터넷 단말기로 확장 가능한 PCS 단말기를 사용해서 위치추적을 하는 시스템이다. 이러한 시스템을 선정하게된 배경은 단말기아 망 이용료의 가격이 저렴하여 현실적으로 트럭이 쉽게 부착할 수 있다는 장점이 있으며 나아가 인터넷 단말기를 활용하여 차량과 관제센터사이에 메시지 전송 등 부가적인 서비스가 가능하기 때문이다.

• KIISE Transactions on Computing Practices
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• v.21 no.7
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• pp.488-493
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• 2015

An AddSIM(Adaptive distributed and parallel Simulation environment for Interoperable and reusable Models) is an integrated engagement simulation environment with high-resolution weapon system models for estimation and analysis of their performance and effectiveness. AddSIM can simultaneously handle the continuous dynamical system models based on continuous time, and command, control(C2) and network system models based on a discrete event. To accommodate legacies based on DEVS(Discrete Event System Specification) modeling, DEVS legacies must first be converted into AddSIM models. This paper describes how to implement DEVS models on AddSIM. In this study a method of mapping from hierarchical DEVS models to AddSIM players was developed: The hierarchical DEVS model should be flattened into a one layered model and four DEVS functions of the model, external transition, internal transition, output and time advance, should be mapped into functions of the AddSIM player.

• Journal of the Korea institute for structural maintenance and inspection
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• v.14 no.1
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• pp.117-124
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• 2010

Different to other social infrastructures, bridge elements or bridges can be damaged or collapsed and this may cause death toll and severe social and economical damage, bridges should be managed to maintain a safety level. Diverse strengthening methods is developed to improve a deteriorated bridge performance up to original design level. But rational decision-making process and methodologies to select a optimum strengthening method are absence yet in Korea. This paper therefore derived items and proposed methodologies for quantity estimate considering uncertainty to select a optimum strengthening method among conceptually designed alternatives. And also, to demonstrate the applicability and verification of the proposed approach, it was applied to select the optimum strengthening method for the deteriorated T-shape concrete girder bridge. The model and the procedure can greatly contribute to the uncertainty-oriented alternative selection.

• Journal of Service Research and Studies
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• v.8 no.3
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• pp.1-23
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• 2018

This study suggests a way through Hong Kong as an alternative strategy for Korean companies to enter Chinese service market which is rapidly expanding due to China's recent policy switch toward service economy. Service market is generally more regulated, labor-intensive, and domestic demand-oriented than goods market, which makes opening of domestic markets to foreigners slow. In case of China, market control and regulations by the State is tighter than other economies. Therefore, it is important to find ways to avoid regulations from the Chinese government if possible. In this sense, this study investigates the China-Hong Kong CEPA and draws its strategic value for entering Chinese service market by comparing it with the Korea-China FTA service sector. In addition, utilizing the difference in tax agreements between Korea-China and China-Hong Kong, and the human network of Hong Kong entrepreneurs in China may play an important role in reducing the risk that might arise in China.

• The Southeast Asian review
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• v.21 no.2
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• pp.183-216
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• 2011

이 글은 잠재적 이주노동자들이 거버넌스에 중요성을 부여하는 정도가 이주의도가 없는 경우와 비교하여 어떻게 다른지를 필리핀의 자료를 이용하여 분석한 연구이다. 2011년 기준으로 전 세계 인구의 3.2퍼센트가 국제이주자이며 이들이 본국에 보내는 노동송금은 4천 4백억 달러에 달한다. 기존연구에서 파악하듯 세계인구이동의 대부분을 차지하는 노동이주의 주요 결정요인은 출신국과 이주대상국의 소득격차, 기존 이주 네트워크, 이주대상국의 이주정책 등을 포함한 경제적 요인들이다. 그러나 대규모 송출국들이 대부분 경제적 저발전과 취약한 정부(ineffective government)의 구조적인 문제를 함께 가지고 있다는 점에 착안한다면 비록 경제적 고려가 우선시 되는 노동이주에 있어서도 잠재적 이주자들이 "정치적" 으로 여타의 사회와 구분되는 특수한 정치적 태도를 가질 수 있다고 생각할 수 있다. 이주자들의 정치적 태도를 올바르게 이해하는 것은 노동이주가 송출국에 미치는 정치적 영향을 분석하는 데 있어 매우 중요하다. 해당 이주자들의 부재와 이들이 본국으로 보내는 노동송금이 송출국 정치에 영향을 미칠 수 있는데 그 영향의 방향은 이주자의 기본적인 정치적 관심과 의제에 따라 달라질 것이기 때문이다. 이러한 배경에서 이 글은 다음과 같은 연구 질문에 답하고자 한다. 첫째, 이주노동의사가 있는 시민들이 취약한 정부능력에 대한 염려가 그렇지 않은 경우보다 높은가? 둘째, 이러한 관계가 성립된다면 그 관계는 민주주의에 대한 지지를 저해하는가? 이 연구는 2002년과 2003년 필리핀에서 실시된 전국적 설문조사인 Social Weather Survey 자료와 2008년 및 2009 년 필리핀 현지조사에서 수집한 인터뷰와 2차 자료를 근거로, 정부능력에 대한 평가와 이주노동의사의 관계를 분석하였다. 연구결과, 기존 연구가 제시하는 통제변인들을 감안하더라도 효과적인 정부운영이 필리핀이 당면한 가장 중요한 과제라고 생각할수록 해외로 취업할 것을 고려할 가능성이 높은 것으로 나타났다. 또한 다행히도 이러한 태도가 민주주의에 대한 원칙적인 지지에는 영향을 미치지 않는 것으로 드러났다. 그러나 효과적인 정부에 대한 관심이 이주노동을 고려하는 시민들에게 높다는 사실은 장기적으로 이들이 해외로 이주할 경우 정부개혁을 요구하고 추진할 국내적 정치적 기반이 줄어들 수 있다는 부정적 함의를 가지기도 한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.3
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• pp.412-419
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• 2020

The strategic unit communication infrastructure for military command, communications requires a dualized network structure of various communication methods, considering the direction of development, strategic unit and line characteristic. It has been pointed out that MicroWave, which is typical of wireless systems, is inefficient because it operates only with existing technologies. Therefore, it is necessary to analyze the structure, efficiency of the MW transmission system and its effects. It is difficult to transfer efficiently considering wireless environment due to a fixed type of access structure in the existing MW transmission system. Adaptive modulation allows improvement, but with traditional access structures and fixed bandwidth, there is a limit. Following the transmission performance improvement technique considering availability and link distance in the previous study, this paper presented improved packetized MW transmission system structure and variable bandwidth transmission in consideration of adaptive modulation based variable transmission waveform, bandwidth and distance, and performed the analysis in view of the strategic unit and command control circuit.

• KIPS Transactions on Software and Data Engineering
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• v.11 no.7
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• pp.283-290
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• 2022

Blockchain is a technology that secures integrity and transparency by distributing and storing transaction details within multiple node networks. Recently, research is being conducted to secure integrity by applying blockchain to Bill of Lading (B/L documents) of monetary value. In this paper, we study a blockchain-based bill of lading system to improve usability. The shippers register the issued bill of lading on the blockchain, and banks in each country read it to conduct L/C transactions. The consignees receive the goods after completing certification with a quick response code (QR) containing the bill of lading information. Through this, shippers enjoy merits in that they can shorten the time and cost of sending shipping documents by mail and prove the integrity of the documents. The consignees have the advantage of being able to check the documents at the same time as they are registered and trust the transaction. Finally, on the bank side, the security of shipping documents is ensured and verification can be done quickly.