• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.9
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• pp.1918-1924
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• 2011

This article proposes a POD system framework which creates templates by using the Web service environment with good accessibility, provides them so that users can easily edit them, and uses COM ports following Web standard capable of real-time printing with the same quality as edited files. The characteristic of framework proposed in this article is that it creates programs which users with basic skill in Internet use can learn and use relatively easily when compared with existing specialized editing programs and which allows users to print real-time such files as personally created by them in the same quality as on the screen, and thereby enhances accessibility thereof.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.736-737
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• 2011

This article proposes a POD system framework which creates templates by using the Web service environment with good accessibility, provides them so that users can easily edit them, and uses COM ports following Web standard capable of real-time printing with the same quality as edited files. The characteristic of framework proposed in this article is that it creates programs which users with basic skill in Internet use can learn and use relatively easily when compared with existing specialized editing programs and which allows users to print real-time such files as personally created by them in the same quality as on the screen, and thereby enhances accessibility there of.

• TTA Journal
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• s.84
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• pp.146-161
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• 2002

TTA(한국정보통신기술협회)는 2002년 10월 8일 (주)이스텔시스템즈(www.eastelsystems.com)의 ATM(asynchronous transfer mode) Router (모델명 : EAR-155)에 대하여 성능 및 aging 시험을 수행하여 국내 최초 TTA Verified 인증서(번호: TTA-V-02-001)를 발급하였다. 본 고에서는 두 대의 EAR-155 ATM Routers를 이용하여 각 라우터의 확장 slot에 Fast Ethernet port, ATM OC3(155 Mbps) port, ATM DS3(44.736 Mbps) port, ATM E1(2.048 Mbps) port 및 TDM E1(2.048 Mbps) port를 장착하여 back-to-back으로 연결한 환경에 대한 no-loss UDP throughput 시험결과를 소개한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2000.11a
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• pp.169-173
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• 2000

현재 컨테이너 터미널에서 사용되고 있는 하역 장비들은 크게 하역작업을 수행하는 크레인과 컨테이너를 운반하는 트레일러, 컨테이너의 하역상태를 파악하는 모니터링 시스템으로 구분할 수 있다. 각각의 장비들은 수동으로 동작되며, 모니터링 시스템에서는 컨테이너의 위치 및 수량 등을 파악한다. 이런 시스템 하에서는 모든 항만 하역 장비들을 사람이 일일이 수동으로 조작함으로써 많은 인력이 필요하다. 또한, 각 하역장비들의 상태를 평면적인 2차원 화면으로만 보여주므로써 모니터링 시스템에 대한 현실감이 떨어진다. 이와 같은 단점을 보완하기 위해 컨테이너를 자동으로 운반하는 AGV를 도입하고 트랜스퍼 크래인과 컨테이너 크레인의 일부분을 자동화하여 작업능률을 향상시키고, 여기에 3차원으로 표현된 VR 시스템을 도입하여 각 하역장비들에 대한 세세한 동작까지를 모니터링함으로써 사용자가 현장에 있는 것과 유사한 느낌을 가질 수 있도록 하였다. 본 논문에서는 이러한 3차원 VR시스템과 모형으로 만들어진 AGV와 컨테이너 크레인, 트랜스퍼 크레인간의 유기적인 데이터 송,수신 및 안정적인 통신을 위해 데이터 포맷에 대한 연구를 하였다. 이런 데이터 포맷의 결정은 손실 없는 통신을 보장하며 나아가 정확한 모니터링을 보장할 것이다.

• Journal of Korea Port Economic Association
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• v.25 no.1
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• pp.1-14
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• 2009

This study predicted Port trade volume by considering Korea's export to China and import Com China separately using ARIMA model (Multiplicative Seasonal ARIMA Model). We predicted monthly Port trade volumes for 27 months from October 2008 to December 2010 using monthly data from September 2008 to January 2001 using monthly data. As a result of prediction, we found that the export volume decreased in January, February, August and September while the import volume decreased in February, March, August and September. As the decrease period was clearly differentiated, it was possible to predict export and import volumes. Therefore, it is believed that the results of this study will generate useful basic data for policy makers or those working for export and import enterprises when they set up policies and management plans. And to improve competitive power of Port trade, this study suggests privatization of Port, improvement of information capability, improvement of competitive power of Port management companies, support for Port distribution companies, plans for active encouragement of transshipment, and management of added value creation policy.

• Journal of Navigation and Port Research
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• v.45 no.5
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• pp.252-258
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• 2021

Given the cyclicality, seasonality, and capital-intensiveness, the development of the shipping industry has long been contingent on corporate financing activities. As such, there have been a growing number of cities in East Asia pursuing a global maritime financial center in order to support their domestic shipping industry. However, it is widely accepted that financial services relevant to shipping in East Asia are quite under-developed compared to those of other leading maritime financial centers in Europe and North America. In this regard, this paper aimed to construct an evaluation index of maritime financial centers in terms of financial ecological environment for the purpose of highlighting the current status of development and suggesting future directions. Furthermore, this paper examined the development of shipping finance in Qingdao as a numerical example using the fuzzy comprehensive evaluation and compared results with those of Shanghai.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.1096-1097
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• 2023

본 연구에서는 항만 교통 혼잡 문제를 해결하기 위해 최적화와 관련된 요소와 트럭 운전기사와 터미널 사이의 협상과 관련된 요소를 새로운 방식으로 고려한 중장기 및 실시간 스케줄링 모델을 제시한다. 중장기 스케줄링 모델은 몬테카를로 시뮬레이션, 실시간 스케줄링 모델은 알파고 제로의 원리와 베이즈 정리를 이용하여 구현했다. 실험 결과 제시된 알파고 제로를 이용한 실시간 스케줄링 시스템이 화물차 평균 지연시간을 30분에서 4분으로 대폭 줄여 지연 시간을 최소화하는 것을 입증했다. 실험 관련 코드는 다음 주소에서 확인할 수 있다 : https://github.com/yulleta/Application_of_AlphaGo-Zero_to_port_arrival_scheduling

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.881-886
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• 2007

This study was to develope a vibrotactile display system using windows media player from digital audio signal. WMPlayer10SDK system which was plug-in tool by microsoft windows media player provided its video and audio signal information. The audio signal was tried to be change into vibrotactile display. Audio signal had 4 sections such as 8bit, 16bit, 24bit, and 32bit. Each section was computed its frequency and vibrato scale. And data was transferred to 38400bps network port(COM1) for vibration. Using this system was able to develop the music suit which presented tactile feeling of music beyond sound. Therefore, it may provide cross modal technology for fusion technology of human senses.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2004.04a
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• pp.209-216
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• 2004

In A bridge which connects Mokpo North Harbor and Com Island is going to be constructed until 2009. For the bridges being built in the navigable water area, it is indispensible to carry out vessel traffic safety assessment from the viewpoint of shiphandlers, however, there exist no specific guidelines for the necessary conditions whim the bridge designers can rely on. In this paper, traffic safety assessment procedures for the layout of the bridge is briefly introduced, and the conditions whim should be taken into account at the initial design stage of the bridge is surveyed. For the safety assessment of the bridge design, ship navigation simulations, such as RTS(real time simulation} and FTS(fast time simulation), are carried out, the results of which are statistically analysed to estimate the probability of collision between the ship and the pier of the bridge.

• Journal of the Korea Institute of Military Science and Technology
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• v.12 no.1
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• pp.106-113
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• 2009

This paper presents a surface acoustic wave(SAW) micro-electro-mechanical-systems(MEMS) interdigital transducer (IDT) gyroscope with 80MHz central frequency on a $128^{\circ}\;YX\;LiNbO_3$, which is consisted of a two-port SAW resonator, metallic dots and dual delay lines for the sensor and reference oscillators. Reason for using two delay line oscillators is to extract the gyroscope effect by comparing the resonant frequencies between two oscillators and to compensate the temperature effect. Based on the coupling of modes(COM) simulation, an 80MHz two ports SAW resonator and dual delay line were fabricated and characterized by the network analyzer. Obtained sensitivity was $109Hz/deg{\cdot}s^{-1}$ in the angular rate range of $0{\sim}1000deg/s$. Good Linearity and superior directivity were observed.