• Journal of the Institute of Electronics Engineers of Korea CI
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• v.42 no.6
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• pp.63-74
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• 2005

In Electronic Commerce, the latest most of the personalized recommender systems have applied to the collaborative filtering technique. This method calculates the weight of similarity among users who have a similar preference degree in order to predict and recommend the item which hits to propensity of users. In this case, we commonly use Pearson Correlation Coefficient. However, this method is feasible to calculate a correlation if only there are the items that two users evaluated a preference degree in common. Accordingly, the accuracy of prediction falls. The weight of similarity can affect not only the case which predicts the item which hits to propensity of users, but also the performance of the personalized recommender system. In this study, we verify the improvement of the prediction accuracy through an experiment after observing the rule of the weight of similarity applying Vector similarity, Entropy, Inverse user frequency, and Default voting of Information Retrieval field. The result shows that the method combining the weight of similarity using the Entropy with Default voting got the most efficient performance.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.40 no.7
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• pp.507-517
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• 2003

A single fiber failure in mesh-based WDM networks may result in the loss of a large number of data. To remedy this problem, an efficient restoration algorithm for a single fiber failure in the mesh- based WDM network is necessary. We propose a new algorithm for restoration scheme in WDM networks and compare it with previous schemes. Path restoration and link restoration are two representative restoration schemes which deal with only a single link failure. In this paper, we propose two kinds of efficient restoration scheme. In the proposed schemes the restoration path for each link failure is not secured. The mesh network is decomposed into a number of small loops. In one algorithm, any link failure in a certain loop is regarded as the failure of the loop and the restoration lightpath is selected by detouring the failed loop. In another scheme any link failure in a certain loop is restored within the loop. We compare performance of the proposed schemes with conventional path restoration scheme and link restoration scheme. Simulation results show that CPU time in the proposed schemes decreases compared with that in path restoration scheme and link restoration scheme, although total wavelength mileage usage increases by 10% to 50%.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.1
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• pp.5-26
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• 2018

Increased mental and psychological wounds and problems in modern humans has resulted in improve the recognition about the importance and necessity of bibliotherapy, and an increase in research related to bibliotherapy. We need to analyze the trend of bibliotherapy research at this point in time from various viewpoints for future development of research on bibliotherapy and establishment of recognition for bibliotherapy. Therefore, in this study, we conducted a comparative analysis of trends of bibliotherapy research between Korea and Japan. The study focuses on research academic papers related to bibliotherapy published in Korea and Japan from 1960 to 2016, and the was analyzed and examined from three viewpoints - (1) Research paper, (2) Utilization of terms, and (3) Academic field & Research Method.

• Spatial Information Research
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• v.15 no.3
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• pp.189-202
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• 2007

As applications of GIS technology have grown in local governments, the wider and integrated use of spatial information is demanded more than before. Particularly because 70-80% of administrative information in local governments are related spatial, it becomes a key issue to connect and integrate non-spatial information with spatial information for more advanced use of GIS applications in local governments. The purpose of this study is to establish an advanced Implementation model by analyzing obstacles in existing GIS applications and suggesting implementation strategies. The strategy, as an important part of the model, includes efficient information sharing, establishment of commonly usable GIS Database, architectural improvement for Enterprise GIS in terms of database and system implementation, standardization far the model, and establishment of spatial infrastructure in the local governments. The study concludes that administrative collaboration in a horizontal and vertical perspective has a highest priority for the implementation of the model.

• Journal of the Korean Society for Railway
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• v.19 no.2
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• pp.251-261
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• 2016

In this paper, changes of railway-related organization during the Japanese colonial period were studied indepth. The railway-related organizations were expanded from the Railway Management Bureau in 1906 (Residency-General). In 1910, this bureau changed to the General of Chosun Railway Bureau (Government-General) and the Chosun Railway Bureau (Government-General). In the 1940's, it developed into an organization called the Transport Bureau, dealing with the whole transport service. The number of employees in the railway sector increased along with the expansion of the organization and the establishment of a training institution for better recruitment. After examining the period of the construction of railway and connection system, which is deeply related to the railway organizations of the Japanese colonial period, this paper analyzes the transformation process of railway-related laws and organizations. Furthermore, this paper finds common characteristics and differences between railways in a comparison of three countries: Chosun, Japan and Taiwan.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.7
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• pp.641-655
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• 1992

In this paper, the performance of the various multiple accesstechniques for the mobile computer network has been studied in the consideration of the characteristics. Of the mobile communication channel. In the case of the hidden node occurring, it could be seen that the performance of the code division multiple access(CDMA) technique. With simultaneous access function is better than that of the other packet access methods such as carrier sensed multiple access(CAMA). Busy tone mulitiple access(BTMA)and idle signal muitiple access(ISMA) in the view of the throuhtput and mean delay time. Also it has been shown that the performance of the CDMA method is superior to that of other packet access techniques such as multiple access(CSMA).etc when the fading effect or impulsive noise exists in the mobile channel. Especially in the case of the distributed mobile network. It has been shown that the receiver-transmitter based CDMA method using the characteristics of CDMA effectively has better throughput and less mean delay time than the commontransmitter based CDMA technique.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.20 no.1
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• pp.101-109
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• 2008

Several numerical models for predicting beach profile changes have been developed by many researchers. Many of the earlier models are known to simulate the erosional profiles with the formation of offshore bar. However, most of the models don't have proper mechanism to incorporate the recovery process of the eroded profiles after a storm and can not simulate the beach accretion with acceptable accuracy. In order to overcome these shortcomings, we propose a new numerical model which has new features to simulate the accretional phase of beach recovery process after storm including such as redistribution of suspended sand particles near the breaking point. The simulation results of the proposed model were compared with LWT (Large Wave Tank) experiments performed at CRIEPI (Central Research Institute of Electric Power Industry in Japan) and CE (the Us Army Corps of Engineers) and it was shown to have performed better compared to SBEACH (Storm-induced BEAch CHange).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.2
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• pp.1434-1440
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• 2015

IDM is a methodology for capturing and specifying processes and information flow during the life-cycle of a facility. The methodology can be used to document existing or new processes, and describe the associated information that need to be exchanged between parties. In this paper, the information model for BIM-based structural steel member design was defined using IDM methodology. The structural information offered in IFC was analyzed, and its adequacy was verified by applying the case study using Excel. As a result, $IFC2{\times}3$ offers the most structural design information for BIM-based structural steel member design, and some sectional properties omitted in $IFC2{\times}3$ were offered in IFC4. IDM methodology can be used effectively for developing BIM-based structural design systems.

• Current Research on Agriculture and Life Sciences
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• v.20
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• pp.65-70
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• 2002

This study was conducted to investigate allelopathic potential of various crosses of rice cultivars using their inhibitory effect on barnyardgrass growth under field conditions, and to determine PAL activity and phenolic compounds involved in phenylpropanoid pathway from selected crosses of rice cultivars. Under field conditions, Kouketsumochi, Woo co chin yu possessed higher allelopathic potential inhibiting over 90% of barnyardgrass growth. Crosses of Kouketsumochi/Woo co chin yu, Dongjinbeyo/Kouketsumochi, Dongjinbeyo/Woo co chin yu showed over 80% inhibitory effects on barnyardgrass growth. The highest PAL activity, $63.46{\mu}kats/kg$ proteins was detected in Kouketsumochi which is the most important enzyme in phenylpropanoid pathway and also higher PAL activity in crosses with Kouketsumochi. Content of cinnamate was $2.64{\mu}g/g$ f.w. in Kouketsumochi which was 2 to 5 times higher than other rice cultivars tested, indicating that higher PAL activity resulted in more cinnamate. The similar trends in cinnamate content and PAL activity were observed in crosses of rice cultivars with Kouketsumochi.

• Journal of the Korean Society for Library and Information Science
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• v.43 no.3
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• pp.31-58
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• 2009

In the digital information environment records have an even closer relationship with business processes and become a core element of organizations' managerial activities. In practice, management is represented as congregation of business outcomes. The importance of records management is increasingly emphasized in terms of organizations' compliance, knowledge-management and risk management. However, there is currently no academic discussion on a between records management and managerial activities. In this context, the study has the notion that this should be defined and acknowledged for public institutions' effective records management. Based on the Malcolm Baldrige Model and ISO 15489, the study discusses a close between records management and management quality. The records management elements of the Malcolm Baldrige model and the managerial quality elements of ISO 15489 were analyzed. Based on the analysis, both common and neglected elements were explored in terms of records management.