• Proceedings of the KIEE Conference
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• 2000.11a
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• pp.122-124
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• 2000

This study is focused on developing a program which can edit different formats of power system data used by system operators PSS/E program, which has been widely used as a tool for power system analysis. Provides only a limited function of editing PSS/E input data. Considering that more and more power system analysers will be developed and applied for power system planning and operation in the near future, unified handling of multi-types of power system data format, such as conversion of one input data format into another, is indispensible. In this paper, a new power system data editor, functionally augmented from PSS/E editor, is introduced. The new editing program was developed in GUI environment for users to conveniently edit input data for EUROSTAG program without running several editors. Considerable savings in time and manpower are expected.

• Annual Conference on Human and Language Technology
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• 1999.10e
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• pp.199-202
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• 1999

ETRI 통신단말연구부에서는 1999년 7월 22일에 C-STAR 회원국이 함께 참여하는 국제간 음성언어번역 시스템 공동 시연을 가졌다. 이 논문은 다국어 대화체 번역시스템인 음성언어번역 시스템의 국제간 공동 시연에 사용된 한국어 번역 시스템의 성능에 대해 기술한다. 번역 시스템의 성능은 전사문장을 이용한 영어, 일본어, 한국어의 번역 결과와 음성인식 결과를 이용한 각 언어의 번역 결과를 평가하여 얻었다. 그리고 세부 시스템의 성능을 알아보기 위해 음성인식의 결과로부터 C-STAR IF(interchange format)까지의 해석 시스템과 C-STAR IF로부터 한국어, 영어, 일본어로 생성해 내는 생성 시스템의 성능으로 나누어서 평가한다.

• Spatial Information Research
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• v.14 no.4 s.39
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• pp.379-389
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• 2006

Map databases for CNS (Car Navigation System) can be accessed quickly and compressed efficiently due to that these are usually recorded as in a PSF (Physical Storage Format). However, it is difficult to create and manage data storage based on a file-system. To solve these problems, DBMS needs to be combined with spatial data management. Therefore, we developed an embedded DBMS with which to store data and conduct quick searches in CNS. Spatial data could be easily managed and accessed using the compression method, Multi-Link, spatial index, and spatial division. In the result, the proposed embedded DBMS searched quickly and stably supported data management. If synchronization is applied in DBMS, it is expected to utilize the advantages of an embedded DBMS.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.17 no.5
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• pp.1413-1432
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• 2023

Recommender systems aim to recommend items to users by taking into account their probable interests. This study focuses on creating a model that utilizes multiple sources of information about users and items by employing a multimodality approach. The study addresses the task of how to gather information from different sources (modalities) and transform them into a uniform format, resulting in a multi-modal feature description for users and items. This work also aims to transform and represent the features extracted from different modalities so that the information is in a compatible format for integration and contains important, useful information for the prediction model. To achieve this goal, we propose a novel multi-modal recommendation model, which involves extracting latent features of users and items from a utility matrix using matrix factorization techniques. Various transformation techniques are utilized to extract features from other sources of information such as user reviews, item descriptions, and item categories. We also proposed the use of Principal Component Analysis (PCA) and Feature Selection techniques to reduce the data dimension and extract important features as well as remove noisy features to increase the accuracy of the model. We conducted several different experimental models based on different subsets of modalities on the MovieLens and Amazon sub-category datasets. According to the experimental results, the proposed model significantly enhances the accuracy of recommendations when compared to SVD, which is acknowledged as one of the most effective models for recommender systems. Specifically, the proposed model reduces the RMSE by a range of 4.8% to 21.43% and increases the Precision by a range of 2.07% to 26.49% for the Amazon datasets. Similarly, for the MovieLens dataset, the proposed model reduces the RMSE by 45.61% and increases the Precision by 14.06%. Additionally, the experimental results on both datasets demonstrate that combining information from multiple modalities in the proposed model leads to superior outcomes compared to relying on a single type of information.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.1618-1622
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• 2004

In this paper, the linearly interpolated PRC(Pseudo Range Correction) regenerating algorithm was applied to improve the DGPS(Differential Global Positioning System) positioning accuracy at user's spot by using the various PRC information obtained from multi-DGPS reference stations. The PRC information of each GPS satellite is not varying rapidly; it is possible to assume that the variation of PRC information of each GPS satellite is linear. So the linearly interpolated PRC regenerating algorithm can be applied to improve the DGPS positioning accuracy at user's spot by using the various PRC information obtained from multi-DGPS reference stations. To test the performance of the linearly interpolated PRC regenerating algorithm, maritime DGPS reference stations' PRC data was used in RTCM format. 11 maritime DGPS reference stations are in service providing DGPS information to public since 1999. Two set of 3 DGPS reference stations are selected to compare the performance of the linearly interpolated PRC regenerating algorithm. The DGPS positioning accuracy was dramatically improved about 40%. Linearly interpolated PRC regenerating algorithm adopted multi-channel DGPS receiver will be developed in near future.

• Journal of Communications and Networks
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• v.13 no.1
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• pp.43-49
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• 2011

In this paper, a new medium access control (MAC) protocol entitled three-phase multiple access with continual contention resolution (TPMA-CCR) is proposed for wireless multi-hop ad hoc networks. This work is motivated by the previously known three-phase multiple access (TPMA) scheme of Hou and Tsai [2] which is the suitable MAC protocol for clustering multi-hop ad hoc networks owing to its beneficial attributes such as easy collision detectible, anonymous acknowledgment (ACK), and simple signaling format for the broadcast-natured networks. The new TPMA-CCR is designed to let all contending nodes participate in contentions for a medium access more aggressively than the original TPMA and with continual resolving procedures as well. Through the systematical performance analysis of the suggested protocol, it is also shown that the maximum throughput of the new protocol is not only superior to the original TPMA, but also improves on the conventional slotted carrier sense multiple access (CSMA) under certain circumstances. Thus, in terms of performance, TPMA-CCR can provide an attractive alternative to other contention-based MAC protocols for multi-hop ad hoc networks.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.5
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• pp.183-189
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• 2023

This paper proposes a new JPEG format, All-in-JPEG, which can include not only multiple photos but also various media such as audio and text by extending the JPEG format. All-in-JPEG add images, audio, and text at the existing JPEG file, and stores meta information by utilizing the APP3 segment of JPEG. With All-in-JPEG, smartphone users can save many pictures taken in burst shots in one file, and it is also very convenient to share them with others. In addition, you can create a live photo, such as saving a short audio at the time of taking a photo or moving a part of the photo. In addition, it can be used for various applications such as a photo diary app that stores images, voices, and diary text in a single All-in-JPEG file. In this paper, we developed an app that creates and edits All-in-JPEG, a photo diary app, and a magic photo function, and verified feasibility of the All-in-JPEG through them.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.258-259
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• 2008

기존의 유선 연결을 이용한 Hometheater System은 점차 다채널로 발전하는Sound Format의 지원에 따라 복잡한 Speaker 연결 구조를 가지게 되어 오히려 사용자의 불편함을 만들고 이에 따라 일부 Speaker만을 사용하거나, 전면에 모든 Speaker를 배치하여 사용함에 따라 다채널 Speaker의 이점을 활용하지 못하고 있다. 이에 따라 점차 Wireless 기반의 다채널 Speaker에 대한 요구가 증가하고 있는데 현재 Wireless 기반의 각 Speaker Unit에 Data를 전송하는 과정에서 전송 delay가 발생하고 이 문제로 인해 Wireless Speaker의 보급에 빠르게 이루어지지 못하고 있는 상태에다. 이에 따라 본 논문에서는 무선랜을 이용한 무선 홈씨어터 시스템 구현에서 문제가 되는 전송Delay에 대해 보정 알고리즘을 통한 개선 방법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.769-770
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• 2023

최근 고성능 웹 애플리케이션 개발을 위한 asm.js. WebAssembly, WebGL, WebGPU와 같은 여러 웹 고속화 기술들이 발표되며 확장되고 있다. 하지만 각 기술들은 개별적으로만 적용 가능하다는 한계점이 있었다. 따라서 본 논문에서는 웹 브라우저 환경에서 최적화된 실행 성능을 기대할 수 있는 다중 웹 고속화 기술들을 통합 한 실행파일 포맷 및 패키징 방안에 대해 제안하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.3
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• pp.1313-1318
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• 2011

This paper proposes a protocol integration system with multi-threading method for the ship electronic devices to solve problems with the compatibility. The proposed protocol integration system receives the different signals from each of the ships' devices through the RS-232 serial communication port and then divides the input signal into the field data. The required field data for standard signal composition are extracted from among these signal and these are combined in accordance with standard signal format. Thereafter, the protocol integration system transmits the processed standard signal to the auto pilot system through a single port.