• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.12
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• pp.2406-2412
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• 2007

Recently, there are many researches about natural language processing programs using artificial intelligence methods. But the researches mostly concentrate on Korean morphological analyses and there are few researches about application of the results of Korean morphological analyses. In this paper, we implemented a natural language conversation program that NPC in games can talk with users by natural language sentences using the results of morphological analyses and a rule-based inference method. We proposed representation and implementation methods of rules suitable for the processing of natural language conversation using NEO, a rule-based inference engine. In the experiment using rules and facts about knowledge of conversation for diet counselor NPC, we could verify that natural conversation results were produced.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.221-221
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• 2017

본 연구에서는 국내는 물론 전 세계적으로 널리 사용되고 있는 SWAT 모형을 대상으로 하천 단면 관련 입력변수가 유량 및 수질 모의에 미치는 영향을 분석하였다. 본 연구에서는 남한강 상류 충주댐 유역을 연구대상지역으로 연구를 진행하였으며, 충주댐 유역 내 소유역 중에서 국립환경과학원에서 국내 하천을 대상으로 구축한 한국형 Reach File(KRF) 내 실측 하천단면 정보가 존재하는 소유역에 대하여 실측 하천단면 정보를 적용하였다. 또한 본 연구를 위해 사용자가 구축한 소유역별 하천단면 정보 입력 자료를 통해 수문 및 수질 모의가 가능하도록 기존 SWAT 모형의 엔진 소스코드를 개선하였다. 유역 최종 유출구와 KRF의 실측 하천단면 정보를 적용한 소유역의 유량과 수질(유사량)에 대해서 실측 하천단면 정보 적용 전과 후의 모의 결과를 비교한 결과 유역 최종 유출구에서는 유량 및 유사량 모두 큰 변화는 나타나지 않았다. 이는 전체 유역 중 실제 하천단면 정보를 적용한 소유역의 비중이 작기 때문으로 판단되었다. 하지만 하천단면 정보를 적용한 소유역에서는 유량 및 유사량 모두 적용 전/후 차이가 나타났다. 특히 저유량 부분에서의 유사량이 큰 변화를 나타냈다. 하지만 본 연구에서 실측 하천단면 정보를 적용한 소유역은 유량 및 수질관측소가 위치하지 않는 미계측 유역으로써 실제 유량 및 수질 모의 정확도 향상 여부에 대한 평가가 불가능하였다. 따라서 향후 유량 또는 수질 관측이 이뤄지고 있는 계측 유역을 대상으로 실제 모형 모의 정확도 향상 여부에 대한 분석이 필요할 것으로 판단된다.

• Journal of the Korean Society of Propulsion Engineers
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• v.22 no.4
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• pp.61-67
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• 2018

High-frequency signals are analyzed at the inlet/outlet pipeline and pump casing during cavitation tests of the LOx pump for liquid rocket engines. Root-mean square values of all data are investigated with respect to cavitation number. The values of synchronous, harmonic, and cavitation instability frequencies are also calculated. Pressure pulsations of the inlet and outlet pipelines are affected by cavitation instabilities. The 3x component (i.e., the blade-passing frequency of the inducer) is predominant in the outlet pulsation sensor. This seems to be related to the fact that the number of impeller blades is a multiple of the number of the inducer blades. The cavitation instability is also measured at the accelerometer of the pump casing.

• Journal of Internet of Things and Convergence
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• v.8 no.2
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• pp.25-33
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• 2022

The purpose of this study is to provide the basic data for establishing a unique admissions promotion strategy for each university and to innovate the paradigm of university admissions promotion through the examples of central universities in the practice of PR promotion based on big data analysis. To this end, prior literature related to university publicity (marketing), and recognition of prospective college students who visited the university, and database data were defined and analyzed as big data. As a result, first, the preliminary studies related to college entrance exam promotion (marketing) increased dramatically in the 2000s and 2010s as part of preparing for countermeasures against population decline in school age. Responding to the need for an admissions promotion strategy to accelerate visits to prospective college students, the database data analysis result suggested the selection and concentration of entrance exam strategies based on the university's regional and academic characteristics.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.254-254
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• 2023

도시화로 인한 불투수면 증가에 따른 물 순환 왜곡 현상이 발생하고 있으며, 이에 따라 물관리를 위한 저영향개발 기법이 국내외에서 적극 도입되고 있는 실정이다. 따라서 본 연구에서는 강우입력에 따라 LID 해석이 가능한 저영향개발 디지털트윈 분석 시뮬레이터를 개발하였다. LID DT 분석 모듈은 LID 시설 해석에 특화된 모형으로 시나리오 강우 기반 시뮬레이션 및 실시간 강우량 연동을 통한 모의가 가능하며, LID 시뮬레이션을 위해 개별적으로 활용함과 동시에 실시간 강우량 연계 시뮬레이션이 가능하도록 개발하였다. 유역유출 계산은 SWMM 모형의 비선형 저류방정식을 기반으로 유출해석 및 기본 LID 해석은 EPA SWMM 엔진으로 해석하며 저수지 추적이 요구되는 빗물이용시설의 경우 별도의 모듈을 적용하였으며, SWMM LID 해석 결과의 시설별 상세 결과 표출이 가능하도록 개발하였다. 현재 LID DT 모형의 시범 지구 적용은 세종시 6-4 생활권 해밀마을을 대상으로 하였다. 소유역 24개소, 우수관로 27개소, 소유역 24개소 및 유역면적 51ha로, 총 64개의 LID 시설을 시설형식을 구분하여 소유역별로 적용하였다. LID 시설의 강우 발생일에 대한 첨두유량과 관측 결과를 비교하여 정상 상황과 비정상 상황의 유량 오차 발생 시 점검 경보 알림 기준을 설정하였으며, 이를 통해 LID 시설의 유지보수 정보를 제공할 수 있을 것으로 예상된다. 또한 실시간 강우 모의를 통해 빗물이용시설의 저류조 용량 대비 현재 빗물저류량을 계산하여 빗물이용시설의 빗물저류량에 대한 정보를 제공하여 물부족 발생알림을 제공 가능할 것으로 예상된다. 따라서 LID DT 시뮬레이터에 및 빗물이용시설 운영에 대한 의사결정 정보를 제공할 수 있을 것으로 판단된다.

• Clean Technology
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• v.16 no.4
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• pp.265-271
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• 2010

The deactivated diesel oxidation catalyst(DOC) was remanufactured by ultrasonic wave treatment with various solutions, followed by active component re-impregnation. The catalytic performance and surface properties of remanufactured DOC were studied at various remanufacturing conditions. The proper ultrasonic-wave cleaning time at various solutions and optimal re-impregnation amounts of active component for the best catalytic performance were investigated. The catalytic performance tests on the conversions of CO and THC(total hydrocarbon) were also carried out at various temperatures by catalytic reaction test unit using bypass gas from the diesel engine dynamo system. It was found that the catalytic performance of DOC remanufactured with the high-temperature air washing, ultrasonic wave cleaning at acidic/basic solutions and active component re-impregnation method was recovered to 90% level of its activity compared to that of the fresh DOC, which was caused by removing the deactivating materials from the surface of the DOC through the analyses of catalyst performance test and their characterization by Optical microscope, EDX, ICP, TGA, and porosimeter.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.7 no.6
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• pp.871-880
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• 2017

Recently, service based on internet is inter-connected and integrated with a variety of connection. This kind of internet of things consist of heterogenous devices such as sensor node, devices and end-to end equipment which used in conventional protocols and services. The representative system is healthcare system. From healthcare appliance used by IoT, patient and doctor can utilize healthcare information with safety and high speed management. It is very convenient management to operate mobility. But it induced security and vulnerability issues because it has small memory capacity, low power supply and low computing power. This made impossible to implement security algorithm with embedded engine based on hardware. Nowdays, we can't realize conventional standard algorithm due to these kinds of reasons. From the critical issues, it occurred security and vulnerability issues. Therefore, we analysed and compared with conventional method and proposed techniques. Finally, we evaluated security issues and requirement for end-to-end point healthcare system based on internet of things.

• The Journal of the Convergence on Culture Technology
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• v.9 no.5
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• pp.801-807
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• 2023

This study aims to examine the cases of overseas experience programs centered around middle school students in South Korea and to derive implications for future overseas experience programs. To achieve this, data were systematically collected through search engines based on keywords, followed by comparative analysis. Frequency analysis, independent sample t-tests, and cross-analysis were conducted using SPSS 23. The research findings are as follows: First, the programs are operated nationwide, with a focus on smaller schools in various regions, and are particularly active in the Jeolla provinces. Diverse public funding, such as from the board of education and local governments, has been invested, categorizing operational costs into full financial coverage among others. The programs primarily took place in Southeast Asian countries close to South Korea. Second, the purposes of these middle school overseas experience programs largely encompass career exploration, cultural experiences, tourism, and sister school visits. We hope that school-based overseas career exploration programs are actively operated to provide opportunities for enhancing global competence and global citizenship, as well as exploring career paths.

• Journal of Intelligence and Information Systems
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• v.16 no.4
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• pp.85-97
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• 2010

Internet communities are a typical space for knowledge creation and use on the Internet as people discuss their common interests within the internet communities. When we define 'Knowledge Communities' as internet communities that are related to knowledge creation and use, they are categorized into 4 different types such as 'Search Engine,' 'Open Communities,' 'Specialty Communities,' and 'Activity Communities.' Each type of knowledge community does not remain the same, for example. Rather, it changes with time and is also affected by the external business environment. Therefore, it is critical to develop processes for practical use of such changeable knowledge communities. Yet there is little research regarding a strategic framework for knowledge communities as a source of knowledge creation and use. The purposes of this study are (1) to find factors that can affect knowledge creation and use for each type of knowledge community and (2) to develop a strategic framework for practical use of the knowledge communities. Based on previous research, we found 7 factors that have considerable impacts on knowledge creation and use. They were 'Fitness,' 'Reliability,' 'Systemicity,' 'Richness,' 'Similarity,' 'Feedback,' and 'Understanding.' We created 30 different questions from each type of knowledge community. The questions included common sense, IT, business and hobbies, and were uniformly selected from various knowledge communities. Instead of using survey, we used these questions to ask users of the 4 representative web sites such as Google from Search Engine, NAVER Knowledge iN from Open Communities, SLRClub from Specialty Communities, and Wikipedia from Activity Communities. These 4 representative web sites were selected based on popularity (i.e., the 4 most popular sites in Korea). They were also among the 4 most frequently mentioned sitesin previous research. The answers of the 30 knowledge questions were collected and evaluated by the 11 IT experts who have been working for IT companies more than 3 years. When evaluating, the 11 experts used the above 7 knowledge factors as criteria. Using a stepwise linear regression for the evaluation of the 7 knowledge factors, we found that each factors affects differently knowledge creation and use for each type of knowledge community. The results of the stepwise linear regression analysis showed the relationship between 'Understanding' and other knowledge factors. The relationship was different regarding the type of knowledge community. The results indicated that 'Understanding' was significantly related to 'Reliability' at 'Search Engine type', to 'Fitness' at 'Open Community type', to 'Reliability' and 'Similarity' at 'Specialty Community type', and to 'Richness' and 'Similarity' at 'Activity Community type'. A strategic framework was created from the results of this study and such framework can be useful for knowledge communities that are not stable with time. For the success of knowledge community, the results of this study suggest that it is essential to ensure there are factors that can influence knowledge communities. It is also vital to reinforce each factor has its unique influence on related knowledge community. Thus, these changeable knowledge communities should be transformed into an adequate type with proper business strategies and objectives. They also should be progressed into a type that covers varioustypes of knowledge communities. For example, DCInside started from a small specialty community focusing on digital camera hardware and camerawork and then was transformed to an open community focusing on social issues through well-known photo galleries. NAVER started from a typical search engine and now covers an open community and a special community through additional web services such as NAVER knowledge iN, NAVER Cafe, and NAVER Blog. NAVER is currently competing withan activity community such as Wikipedia through the NAVER encyclopedia that provides similar services with NAVER encyclopedia's users as Wikipedia does. Finally, the results of this study provide meaningfully practical guidance for practitioners in that which type of knowledge community is most appropriate to the fluctuated business environment as knowledge community itself evolves with time.

• The Korean Journal of Air & Space Law and Policy
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• v.17
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• pp.133-152
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• 2003

Certification by Civil Aviation Law is necessary for aircraft parts and appliances as well as aircraft, engines, and propellers to ensure safety and reliability in operation. Advanced countries in aerospace industry as like U.S.A require Parts Manufacturer Approval for aircraft parts and Technical Standard Order Authorization for designated appliances. However, there are no legal requirements for certification of aircraft parts and appliances in Korea until now. This study presents the draft to revise Civil Aviation Law, which is applicable to set up domestic certification system and maintain it equivalent to U.S. Federal Aviation Regulation.