• Tunnel and Underground Space
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• v.9 no.4
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• pp.328-336
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• 1999

To characterize the hydro-mechanical behavior of a rock joint, a rotary shear testing apparatus was devised in this study. Shear stress was driven by twisting the end of a sample in the rotary shear testing apparatus. The test results show that the rotary shear test underestimates the peak shear strength of a rock joint. The torque is known as a function of the radial distance from the axis of rotation, resulting in the radial variation of the shear stress. Fluid flow through rock joints is mainly dependent on the Joint roughness, contact area, initial aperture. To examine the dependency, the relationship between the hydraulic and the mechanical apertures for shear-flow was established by measuring the initial aperture. It shows that the mechanical aperture and the hydraulic aperture increase linearly with the dilatancy. The difference between the hydraulic and mechanical apertures describes the deviation from the behavior predicted by the parallel plate model.

• Journal of Korea Society of Industrial Information Systems
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• v.17 no.7
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• pp.111-118
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• 2012

Recently, most of firms have continuously released new products satisfying various needs of customers in order to increase market share. As a lot of products with various functionalities, prices and designs are released in the market, users have difficulties in choosing an appropriate product, especially for information technology driven devices. In case of digital cameras, inexperienced users spend a lot of time and efforts to find proper model for them. In this study, therefore, we design and implement a personalized recommendation system using analytic hierarchy process, one of the multi-criteria decision making techniques, and hybrid filtering combining content-based filtering and collaborative filtering to recommend a suitable product for inexperienced users of information technology devices.

• Journal of the Korean association of regional geographers
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• v.12 no.6
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• pp.704-719
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• 2006

The study deals with the France's recent cluster policy represented by the Competitiveness Pole. As a national level cluster supporting policy driven by the central government, the Competitiveness Pole, called 'French cluster model', :is competitiveness-oriented, and principally based on three main factors: partnerships, R&D projects and international visibility. The Competitiveness Pole is also the fruit or a long time effort to establish a decentralized governance system, and it has a lot for Korea to benchmark its relevant policies. After reviewing the Local Production System that was put in place before the Competitiveness Pole, the study treats main aspects or Competitiveness Pole policy. It analyze, then, the significance or the policy in the trend or the overall territorial policy or the country. Lastly, the study provides some implications for Korean policies such as industrial clusters, the Enterprise City and Innovation City.

• Journal of the Korean Society for information Management
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• v.27 no.1
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• pp.137-163
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• 2010

Library course pages are an integrated service providing both course management information and library resources as one gateway to strengthen university libraries' information services. It is possible to associate course management system and library resources, and to provide course-specific information rather than library interface with various searching gateways. In the case of foreign university libraries, library course pages have been developed more effectively and variously for university's environment and characteristics, and have been built for all the courses in a university by system processing, not manually. In foreign libraries, there are many sophisticated, dynamic, database-driven house-developed and vendor-developed systems for library course pages than hand coded HTML pages. But in Korea, there is a lack of awareness of the importance of library course pages among librarians, and the programs of library course pages have not yet been developed. Therefore, this study is to build the model for library course pages using literature reviews and case studies. Then, this study could also lay the foundation for effective library services and the system development of library course pages.

• Journal of Intelligence and Information Systems
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• v.10 no.2
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• pp.79-89
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• 2004

Since the amount of E-mail messages has increased , we need a new technique for efficient e-mail classification. E-mail classifications are grouped into two classes: binary classification, multi-classification. The current binary classification methods are mostly spm mail classification methods which are based on rule driven, bayesian, SVM, etc. The current multi- classification methods are based on clustering which groups e-mails by similarity. In this paper, we propose a novel method for e-mail classification. It combines the automatic category generation method based on the vector model and the dynamic category hierarchy construction method. This method can multi-classify e-mail automatically and manage a large amount of e-mail efficiently. In addition, this method increases the search accuracy by dynamic reclassification of e-mails.

• Journal of Internet Computing and Services
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• v.2 no.5
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• pp.1-7
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• 2001

Recently, there are two important research trends in the literature the red-time collaborative computing end electronic business process automation. This paper is one of those efforts that would establish an effective business office working and computing environment hough the integration of those two cutting-edge technologies. That is, we try to develop a workflow modeling tool that is semantically based upon the information control net(ICN), which is a typical workflow model for specifying office work procedures(business processes), and that is systemically based upon the real-time collaborative operations by a set of actors, which is called group, We name it "group ICN editor". This paper describes the design and implementation of the group ICN editor that is operable under the real-time collaborative computing environment. We use the Flexible rJAMM toolkit that enables the ICN editor to operate among multiple actors(group) through the event-driven collaboration platform, Consequently, a set of workflow and business processes defined through this editor is not only stored onto database but also transformed into the format of the workflow process definition language(WPDL) that is a standardized workflow description and specification language proposed by the workflow management coalition(WfMC).ion(WfMC).

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.43
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• pp.423-453
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• 2009

Import Agency Service Mall, which provide customers not only with convenient shopping experiences but also with purchasing, warehousing, shipping, and customs clearance services, have been playing a significant role in rapidly transforming Korean consumers into global consumers. The consumers' great demand for foreign goods(services) created Import Agency Service Mall(referred to hereafter as IASM) as a new business model of distribution and consumption, which seems to grow rapidly. Accordingly, this study examined the e-Trust by analyzing the characteristics of IASM, determinants of trust, risk perception and its association with e-Trust in IASM, and finally applying the result to general internet shopping mall(referred to hereafter as GISM). The following results came out from the analysis: First, from the result of checking these two types of internet shopping mall consumers have different determinants of trust. Second, from the question if two types perceive different risk, purchasing the foreign goods, it came out that they showed critical difference in variable relevant to goods delivery and customer service. IASM perceived risk from those two variables more than GISM Third, from the review of the relationships between determinants of trust and risk perception variables, IASM showed interrelation among all the variables except between customer service and perceived risk. Fourth, the researcher examined how the risk perceived in the course of purchasing goods has an effect on consumers e-Trust. In case of IASM, risk perception relevant to customer service had an effect on consumer e-Trust. To the contrary, incase of GISM, risk perception didn't have any effect on e-Trust. Finally, from the review of interrelation between determinants of trust and consumer e-Trust, it came out that for IASM capability had an effect on consumer e-Trust and for GISM consumer service had an effect on consumer e-Trust.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.11
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• pp.6412-6418
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• 2014

This paper performed a numerical study of an air-liquid ejector. An ejector is a fluid-transportation device that spouts high-pressure fluid from driving pipes using the kinetic energy of the spouted fluid and increases the pressure through the exchange of momentum with the surrounding gases of the lower pressure. The air-liquid ejector was investigated through steady three-dimensional multiphase CFD analysis using commercial software ANSYS-CFX 14.0. Water as the primary fluid is driven through the driving nozzle and air is ejected as the second gas instead of ozone in real applications. The difference in performance according to the shape of the diffuser of the ejector was examined. The results provide deep insight into the influence of various factors on the performance of the air-liquid ejector. The proposed numerical model will be very helpful for further design optimization of the air-liquid ejectors.

• Proceedings of KOSOMES biannual meeting
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• 2005.11a
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• pp.159-163
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• 2005

This experimental study was performed to investigate internal flow and unsteady flow characteristics using a model for actual shape of a plate heat exchanger and visualization of flow through the particle image velocimetry. Seven Reynolds numbers were selected by calculation with the height of grooved channel and sectional mean velocity of inlet flow in the experiment, and instantaneous velocity distributions and flow characteristics were experimently investigated. The triangular grooved channel had a compound flow consisting of the flow in lower channel and the groove flow receiving shear stress by the channel flow in the experiment. The sheared mixing layer, in the boundary between the triangular groove and the channel, affected main flow to raise turbulent in the channel.

• Journal of Advanced Navigation Technology
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• v.20 no.3
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• pp.175-181
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• 2016

This paper introduces a heave compensation system for offshore crane when it gets unexpected disturbances and external force. The dynamic model consists of crane assumed to be the rigid body, hydraulic driven winch, elastic rope and payload. To keep the payload from moving up and down, PD control algorithm is applied. By using the control, the oscillating amplitude of the payload is reduced. Also by using the estimated values involved with time-delay, the relative motion of payload in heave direction is dramatically shortened. This paper shows using the control algorithm with estimated value having time-delay 0.1 second is enough to heave compensation system.