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박판 알루미늄 도금강판의 플라즈마 용접성에 미치는 용접조건 및 롤러의 영향
이태우,박철호,강남현,김명덕,Lee, Tae-Woo,Park, Cheol-Ho,Kang, Nam-Hyun,Kim, Myung-Duk 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.2
Al-coated steel sheets with excellent heat and corrosion resistance are widely used in various applications. In welding of thin plate, some defects such as unmelted zone and metal-through occur easily in the beginning and ending of welding line. In the study, the welding defects in Al-coated steel sheets were investigated with respect to plasma arc current, height between Cu block and base metals, and using a roller to align the height of the base metal. Full penetration and voids free welds were obtained with a plasma arc current 52A and weld speed 2.3m/min. An unmelted zone increased and Ericshen rate decreased as the height between Cu block and base metal increased from 0 to 0.6mm. Using a roller moving ahead of the plasma arc, the length of unmelted zone decreased from 1.7mm to 0.5mm.
세계 주요 컨테이너 해운기업의 전략적 제휴의 현황과 그 생성원인에 관한 연구
이태우,김광희,이광희,Lee, Tae-Woo,Kim, Kwang-Hee,Lee, Kwang-Hee 한국항해항만학회 1997 한국항해학회지 Vol.21 No.3
From the beginning of 1990s , also in the shipping industry, especially liner shipping industry competition has been more intensive and difference of the service quality among shipping companies has been learned . On the other hand, a shipping company has some limitations to do its international mission for itself just by broadening service area. For this reason, the necessity for the global strategi alliance among the shipping companies, which is orginally aimed at sharing of facilities and organixation, has been developed. Through strategic alliance, liner shipping companies do not need to input the additional capitals to increase the material assets such as vessel capacity and spread the risk by the enlargement of the market. Also, they can secure the competitive edge through efficient utilizaton of assets. The purpose of strategic alliance of Hanjin Shipping Ltd., can be summarized as follows ; broadening of service area, cost reduction through vessel sharing, realization of rationalized shipping service by terminal and equipment or facilities sharing. Liner strategic alliances are agreement among liner companies to pol their equipment , andterminals for joint operations and services in which each alliance partner continues to serve its market using jointly operated or used inland feeders,inland terminals, port terminals, and mainline fleets of ship as well as joint pools of containers and equipment. Strategic alliances are generally more formal agreements than consortia and impose longer term and far reaching obligation on their members. It also acts as one in developing and advancing the strategic aims of the alliance members. The most important objective for liner strategic alliances is cost reduction and improvement in capital asset utilization. Main aims of strategic alliance drawn in this paper, can be enumerated follows : 1. improvements in service frequency and quality : 2. improvements in vessel and equipment utilization and thereby reductions in fixed and variable cost ; 3. improvements in market shares and high value cargo booking ; 4. reductions in intermodal storage and port terminal throughput costs ; 5. improvements in negotiating powers with ports and feeder transport providers ; 6. reduction in financial and other fixed costs such as insurance; 7. coordination and integration of MIS and EDI systems and service for greater efficiency and market penetration ; and, 8. improvements in logistic chain management and economic of scale by equipment depot, terminal, and vessel sharing.
TiB<sub>2</sub> 분말로 강화된 Cu-TiB<sub>2</sub> 복합재료의 내마모특성
이태우,최종운,강계명,Lee Tae-Woo,Choi Jong-Un,Kang Kae-Myung 한국재료학회 2005 한국재료학회지 Vol.15 No.12
In this study the effect of the content of $TiB_2$ on wear properties was investigated. $Cu-TiB_2$ composites have been fabricated by hot extrusion. Sliding wear tests were peformed by a pin-on-disk type wear test machine under dry condition and loads varied with from 20N to 80N at sliding speed 3.5Hz. The test results showed that the wear losses and the friction coefficients decreased with increasing $Cu-TiB_2$ volume fraction and increasing the size of $Cu-TiB_2$ particle. Wear property of $10{\mu}m,\;5 vol\%\; TiB_2$ specimen was excellent all of the wear specimens. It is thought that the increase of plastic flow resistivity due to uniform distribution of $10{\mu}m,\;5 vol\%\; TiB_2$ wear specimen would improve wear property. The worn surface and wear debris were examined by optical microscope and scanning electron microscope.
Cu-TiB<sub>2</sub> 복합재료의 마모거동에 따른 미세조직 관찰
이태우,강계명,Lee, Tae-Woo,Kang, Kae-Myung 한국재료학회 2006 한국재료학회지 Vol.16 No.8
The dispersion hardened $Cu-TiB_2$ composites are a promising candidate for applications as electrical contact materials. The $Cu-TiB_2$ composites for electrical contact materials can reduce material cost and resource consumption caused by wear, due to their good mechanical and electrical properties. In this study, we investigated the wear phenomenon for $Cu-TiB_2$ composites fabricated with hot extrusion, by varying particle sizes and volume fractions of $TiB_2$. The wear tests were performed under the dry sliding condition with a fixed total sliding distance of 40 m. The contact loads at a constant speed of 3.5 Hz were 20, 40, 60, and 80 N. The friction coefficients and wear losses were measured during wear tests. Worn surfaces and wear debris after wear tests were investigated using the scanning electron microscope and the optical microscope. The microstructures of interface between Cu matrix and $TiB_2$ particle before and after wear tests were studied by the transmission electron microscope.
미디어 스트리밍 서비스를 위한 오버레이 멀티캐스트 기법
이태우(Tae-Woo Lee),조용환(Yong-Hwan Cho) 한국엔터테인먼트산업학회 2014 한국엔터테인먼트산업학회 학술대회 논문집 Vol.2014 No.5
본 논문에서는 오버레이 멀티캐스트 트리 구성 시 하위 호스트에서 루트 노드로 전송되는 호스트에 대한 정보를 기반으로 트리 구성 지연시간을 감소시켜 실시간 미디어 스트리밍에 적합한 QoS(Quality of Service)를 보장하는 효율적인 트리 구성 기법을 제시하고자 한다. 제안하는 기법에서 루트 노드는 새로운 호스트를 자신의 자식 노드로 수용할 수 있는 호스트들의 정보를 분석하여 목록을 구성하고, 신규 호스트의 서비스 요청 또는 호스트 탈퇴 및 이탈로 인한 트리 재구성 시 해당 목록을 전송하여 기존의 방법보다 빠르게 트리를 구성할 수 있게 한다. 이는 오버레이 멀티캐스트 트리의 구성 및 재구성 시 가용 부모 노드 탐색에 걸리는 시간을 단축시켜 실시간 미디어 스트리밍처럼 지연에 민감한 서비스에 적합함을 실험을 통해 증명한다.
이태우(Lee, Tae Woo) 대구대학교 인문과학연구소 2011 人文科學硏究 Vol.37 No.-
The teaching method of languages and letters, which have their universal validity, demands linguistic genuineness and legitimacy. Though these languages and letters have universal validity, something like tradition and authority, there have been dominance, oppression, distorted communication, that is to say, they have played important roles as ideological resource and transmission. Habermas raises a question whether mutual agreement, though it is the agreement through plenty of communication, be real or not. He thinks that there can be distorted and false agreement even though it is through sufficient conversation. Habermas"s important concern is to find out the possible condition of true mutual agreement and unified public opinion after overcoming distorted communication. Habermas tries to propose ideal blueprints for the condition of non-distorted communication. They are the communicative competence, discourse, ideal speech situation, agreement and unified opinion. But these Habermas"s proposals are encountered by harsh criticism. They are criticised that those proposals are too unfeasible schemes. Also We can still put questions on habermas"s ideal proposals whether these can survive on under the conditions of unreasonable thoughts and illogical social systems prevailing these days.