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이병화,황민영,선칠영,전충환 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7
Resolving ash-related problems such as fouling and slagging is crucial to the operation of a heat recovery steam generator (HRSG) in apower plant using heavy fuel oil (HFO). This paper presents numerical predictions of ash particle deposition using a model implementedwith CFD code. The deposition model considers the force of gravity, elastic rebound, and adhesion forces acting at the moment of ashparticle impact, which determine if the particle bounces off or stays on the surface and accumulates into a deposit. The 2D simulationresults showed that ash deposition depends significantly on the particle size and velocity. The normal gravity force is a significant parameterthat determines the position of deposition. The simulation results for ash deposition in an HFO-HRSG showed that ash depositsare highest (~34%) in the first and second rows, where the particles hit first, after which deposition decreases. However, ash deposits inthe internal array increase again in the rear rows because rebounding particles decelerate and are deposited because of gravity, as confirmedby observations of actual deposit formation.
李炳華 新羅大學校 1987 論文集 Vol.24 No.-
The objective of this paper is to analyze and explore the Kim-koo`s economic thought. In order to make an adequate explanation of Kim-koo`s thought, it is necessary to trace back his personal background and the situations in which he devoted to the participation of the independence of movement. That is because his thoughts were formulated under the direction of his own personality with his social background and his activity. A historical-descriptive method has been used in the study for the purpose of analyzing sonne major events in the life of Kim-koo which made possible the formation of his economic thought and its subsquent changes. Kim-koo`s economic thought can be found in his writings, the documents of provisional government, the party principle platforms of Korean Independence Party(Han-Dok Dang), an Samkyunchui(tri-eguality principle) which provided the ideological principle for the various independence movement groups, and many others, Samkyunchui is one of the most original and outstanding of Korean and western thought. The findings of this paper with the approaches I have mentioned are as follows: 1) The core elements of the Kim-koo`s economic thought were based on anti-Japanese imperialism. His thought calls for a revolution to overthrow the Japanese regime and to recover Korea1s lost territory. Moreover, he attempted to extend the concept of economic equality to embrace not only the relationship between Korea and Japan but also between all nations of the world as to create a universal brotherhood. 2) Kim-koo`s economic thought overcame conflicts between various factions in Korean independence movement and played the role of amalgamation between the left and right wingers. Due to the unique mixture of various elements, his thought became to take a moderate position which was characterized by the avoidance of extreme of the political spectrum. 3) Kim-koo`s thought was the key theory for the nation(new republic) building movements and suggested the vision of unified nationstate. His thought calls for reconstruction of new republic on the basis of equality of opportunity in the economical, political and educational fields. The key point is equality of economic field, so he emphasized the nationalization of land and enterprises so that all the people may have equal rights and privileges in their livelihood. This paper is written as an exploratory study. Therefore, there would be lots of questionable statements in this paper. However I hope that this paper could be a steppingstone which could lead to the more conprehensive study of the Kim-koo`s economic thought in the future.
Localization Algorithm without Range Information in Wireless Sensor Networks
이병화,엄두섭,Lee, Byoung-Hwa,Lee, Woo-Yong,Eom, Doo-Seop 한국전기전자학회 2007 전기전자학회논문지 Vol.11 No.4
A sensor network is composed of a large number of sensor nodes that are densely deployed in a field. Each sensor performs a sensing task for detection specific events. After detecting this event, location information of the sensor node is very important. Range-based scheme of the proposed approaches typically achieve high accuracy on either node-to-node distances or angles, but this scheme have a drawback because all sensor nodes have the special hardware. On the other hand, range-free scheme provides economic advantage because of no needed hardware even if that leads to coarse positioning accuracy. In this paper, we propose a range-free localization algorithm without range information in wireless sensor networks. This is a range-free approach and uses a small number of anchor nodes and known sensor nodes. This paper develops a localization mechanism using the geometry conjecture (perpendicular bisector of a chord). The conjecture states that a perpendicular bisector of a chord passes through the center of the circle.
李秉花,沈和珍 아시아민족조형학회 2005 아시아민족조형학보 Vol.5 No.1
The study was intended to investigate the impact factors of marketing-mix strategy in Hanbok (Korean Traditional Costume) business to customer satisfaction and the cause-effect relation influencing on sales growth. Following the setting of variables associated with the study goal, study questions and a study model were presented.<br/> A Total of 672 finished copies of questionnaire were analyzed with structured equations, using SPSSWIN 10.0 and AMOS 4.0.<br/> It turned out that all variables, that is, goods, price, sales promotion, and distribution type are the impacting factors to customer satisfaction. Of them, sales promotion and distribution acceptance type gave more impact than other variables. Customer satisfaction had an impact relation with sales rate growth. In conclusion, sales promotion factor is the most important element in making a marketing strategy for customer satisfaction, and customer satisfaction leads to sales rate growth.
600MPa 고강도 나사형 철근을 사용한 철근콘크리트 보의 이음성능
이병화,조승호,이상현,정란 단국대 부설 리모델링연구소 2012 리모델링 연구소 논문집 Vol.10 No.2
Strength bar has merits in workability improvement, construction time shortening and connection details to be easy. But, lap splice length tends to be longer. In this study, high strength threaded bar will be reviewed whether it is appropriate in domestic standards by KCI concrete structural criteria and propose the mechanical splice.