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김상도 ( Sang Do Kim ),이시훈 ( Si Hyun Lee ),임영준 ( Young Joon Rhim ),최호경 ( Ho Kyung Choi ),임정환 ( Jeong Hwan Lim ),정동혁 ( Dong Hynk Chun ),유지호 ( Ji Ho Yoo ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.1
5 kg/hr 벤치규모 기류건조기를 이용한 고수분 석탄의 건조 특성을 알아보았다. 도착시료 기준으로 원료 석탄의 수분 함량 및 발열량은 각각 29.74 wt%, 4,270 kcal/kg이다. 가스유입온도 및 가스유입속도는 각각 400~600 ℃ 및 10~20m/sec이다. 원료 석탄의 입자크기는 100~2,000 μm로 분쇄 및 분급하였다. 원료석탄의 수분제거율은 가스유입온도는 증가하고 가스유입속도는 감소할수록 급격하게 증가하였다. 건조석탄의 발열량은 5,100~5,900 kcal/kg으로 증가하였다. 기류건조를 통한 고수분 석탄 표면에서의 발생하는 화학적인 변화를 알아보기 위하여 FT-IR 스펙트럼 분석을 실시하였다. 그 결과 하이드록실, 카르복실 및 카보닐 피크에서 주요한 변화가 일어나는 것을 확인할 수 있었다.
김상도(Kim Sang Do),문병주(Moon Byung Joo),류근호(Ryu Keun Ho) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.6
As Internet is popularized by the advent of Web concept having characteristics such as open network, user-friendly, and easy-usage, there are many changes in Information systems providing various information. Web is rapidly transferred traditional Information systems to Web-based Information systems, because it provides not only text information but also multimedia information including image, audio, video, and etc. Also, as information contents were changed from text-based simple abstract information to full-text information, there was appeared various document formats processing Full-text information. But, as they naturally demand large system memory, long processing time, broader transmission bandwidth, and etc, estimating of these factors is necessary when constructing information systems. This paper focuses on how to design and construct information system processing full-text information and providing function of an integrated document. Primarily, we should review standard document format which is used of developed, and any document format is appropriate to process full-text information in review with viewpoint of information system. Also, practically we should construct information system providing full-text information based on PDF document.
김상도(Sang-Do Kim),박성배(Seong-Bae Park),박세영(Se-Young Park),이상조(Sang-Jo Lee),김권양(Kweon-Yang Kim) 한국지능시스템학회 2010 한국지능시스템학회논문지 Vol.20 No.2
본 논문에서는 감성 점수가 명시적으로 부여되지 않은 온라인 영화평에 대해 자동으로 감성을 분류하는 방법을 제안한다. 긍정이나 부정과 같은 감성 극성 분류를 위해 문자열 커널의 확장 모델인 음절 커널에 기반한 지지벡터기계를 분류기로 사용한다. 실험을 통하여 띄어쓰기나 철자 오류 같은 문법적인 오류가 빈번한 온라인 영화평에 대한 감성 분류에서 제안한 음절 커널 방법이 효과적임을 보인다. In this paper, we present an automatic sentiment classification method for on-line movie reviews that do not contain explicit sentiment rating scores. For the sentiment polarity classification, positive or negative, we use a Support Vector Machine classifier based on syllable kernel that is an extended model of string kernel. We give some experimental results which show that proposed syllable kernel model can be effectively used in sentiment classification tasks for on-line movie reviews that usually contain a lot of grammatical errors such as spacing or spelling errors.
論文(논문) : 세계 LCC 비즈니스 모델의 전략적 변화 연구 및 국내 LCC 산업 관련 시사점 도출(세계 주요 LCC 사례를 중심으로)
김상도 ( Sang Do Kim ),김기웅 ( Kee Woong Kim ),최건희 ( Kun Hee Choi ) 한국항공운항학회 2013 한국항공운항학회지 Vol.21 No.3
As the price competition between airlines became increasingly intensified, due to increased participation of low-cost carriers in the air transport industry and the continued deregulation of international air transport, each airline has introduced various management techniques for securing international competitiveness and operational efficiency in order to cope with the uncertainty in air transport industry. The world leading LCCs, such as Ryan air, easyJet and Southwest, have changed their traditional business models by increasing operation to primary airports, diversifying operating routes, making strategic alliances with FSCs or other LCCs, increasing the operations on the mid or long distance routes, expanding ancillary revenues, etc. As Korea`s air transport industry is confronting with intense competition, our LCCs are requested to adjust to this new challenging situation. As the world leading LCCs did, Korean LCCs are recommended to adopt new business models such as restructuring of the air transport industry through M&A, operating more flexibly in terms of frequency or route, launching of services to primary airports, making strategic alliances with foreign FSCs, developing of 4th or 6th traffic demands, etc.
국산 저가형 실리카퓸을 이용한 고성능 콘크리트의 물리적 특성 분석
김상도(Kim Sang Do),윤경구(Yun Kyung Ku),한승연(Ham Seung Yeon),이겨레(Lee Kyeo Re) 강원대학교 산업기술연구소 2017 産業技術硏究 Vol.37 No.1
In this study, as part of a research on the development of economical high-performance concrete with high strength and high quality, the physical properties of high-performance concrete were analyzed by substituting a certain amount of low-cost domestic silica fume exempted from the re-importation type distribution structure of the domestic production and the existing high-priced silica fume distribution structure. Performing tests to identify the physical properties of the fresh and hardened concrete and durability analogy of the concrete which use low-cost domestic silica fume and imported silica fume, the chloride ion penetration resistance test result showed that the strength difference between the low-cost silica fume and the imported silica fume is not big but the strength of the low-cost silica fume was measured higher than the imported silica fume. The chloride ion penetration resistance of all variables was measured as “very low”. Since the low-cost domestic silica fume can be used as a high-performance admixture of concrete, the results suggest that it is possible to produce a more economical high-performance concrete.
국내선 항공여객의 서비스 만족요인에 대한 실증연구 -김포-김해노선을 중심으로-
김상도 ( Sang Do Kim ),강용규 ( Yong Kyu Kang ),남흥섭 ( Heung Sub Nam ) 한국항공경영학회 2011 한국항공경영학회 춘계학술대회 Vol.2011 No.-
Service for air travellers consists of airlines, airport authority, government agencies including CIQ, ground service operators for aircraft maintenance, commercial facilities and ground transportation. Therefore the decision for repurchase of flight ticket may result from experiencing overall services mentioned above. This paper tried to the causal relationship between passengers` satisfaction and changes of air traveller demand. According to analysis of factors impacting customer satisfaction, it was found out passengers preferred fastness, accessibility and airline services to services provided by airport. Depending on such results, more efforts throughout overall process of service are to be made for air travel industry to be more competitive by meeting needs customers have preferred.
김상도(Sang Do Kim),임경수(Kyoung Soo Lim),이시훈(Si Hyun Lee) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
In this study, flash dryer for upgrading of low rank coal was tested in the laboratory scale of 5㎏/hr apparatus. In a flash dryer, a wet feed material is rapidly dried by direct contact with hot air while being transported by the air stream. Coal samples obtained from Mongolian coal (lignite) that has moisture contents of 29.74%, volatile matter contents of 27.83%, ash contents of 10.51% and heating value of 4,270㎉/㎏ (as received basis). Drying air is heated with a burner and inlet velocity of hot gas is 20m/sec, inlet air temperature ranges of 400-600C, particle size of raw coal is in the range of 0.1-2㎜. Moisture content of raw coal was rapidly decreased to lower than 7% with increasing the inlet air temperature and the heating value was increased to more than 5,550㎉/㎏. Finally, new model of hybrid flash dryer for upgrading of low rank coal was suggested.