• Management Science and Financial Engineering
• /
• v.16 no.2
• /
• pp.29-38
• /
• 2010

As the Internet is more embedded in people's lives, Internet users draw on new Internet applications to express themselves through "user-created content (UCC)." In addition, there is a noticeable shift from text-centered contents mainly posted on bulletin boards to multimedia contents such as images and videos on UCC web sites. The changes require different way of recommendations comparing to traditional products or contents recommendation on the Internet. This paper aims to design UCC recommendation methods with user behavior data and contents metadata such as tags and titles, and compare performances of the suggested methods. Real web logs data of a major Korean video UCC site was used to empirical experiments. The results of the experiments show that collaborative filtering technique based on similarity of UCC customers' preferences performs better than other content-based recommendation methods based on tag information and content metadata.

• Journal of Korea Society of Industrial Information Systems
• /
• v.23 no.3
• /
• pp.73-86
• /
• 2018

An analysis of Airbnb and Kozaza will show how valuable and rare resource can have an impact on company performances. Airbnb applied the sharing economy platform, and this business model had disrupted the hospitality industry. Thus, this paper will investigate a Korean company called Kozaza which had benchmarked Airbnb. Furthermore, it will apply the theory of VRIO framework, which consists of how valuable, rare, costly to imitate (imitability), and organization (exploited by the organization) to find competitiveness of Kozaza in the hospitality industry. Thus, it will attempt to show that Kozaza's business model of utilizing the unused resource of Hanok (traditional Korean house) and partnerships with Hanokstay, Seoul Metropolitan Government and Soul Tourism Organization and others have enhanced their resource and capability to strengthen their business model. Furthermore, this research will explore how Kozaza can competitively be successful in the future.

• Journal of Korean Society of Transportation
• /
• v.8 no.1
• /
• pp.5-15
• /
• 1990

As a result of the lack of methodology for the determination of navigational channel capacity and the consequence lack of effective management of traffic, navigational channels are often grossly underutilized or highly congested. The traditional rule of first-come-first-served admission of vessels to channels is not efficient as it assumes equal time intervals between entrance of consecutive vessels. A new vessel traffic management system is developed in this research and methodologies to measure the improvement in the channel capacity are developed. Methodology to measure the channel performances for three queue disciplines are developed. The effects of changes in major factors on the channel capacity model such as channel length, fleet mix and arrival rate, as well as changes in strategy are analyzed. Under given channel conditions, best strategy are recommended. Also, a method for effective stochastic channel capacity simulation was developed. The results of analysis and as ertions are compared with the results of simulation runs to prove their applicability.

• The Journal of Fisheries Business Administration
• /
• v.9 no.1
• /
• pp.1-27
• /
• 1978

The paper attempts to analize the economic situations of the coastal fishing business contering on the fishery right fisheries. Fisheries in Korea are usally divided in to three categories according to the distance fishing grounds; namely, coastal fisheries, off -shore fisheries and deep-sea fisheries. The fishery right fisheries fall into the category of the coastal fisheries, and include five typs of fisheries: 1. Class 1 common fishing 2. Class 2 common fishing 3. Class 3 common fishing. 4. Set-net fishing. 5. Aquarculture fishing. These fisheries have been stagnated mainly due to traditional fishing methods, unskilled labor forces, shortage of capital, and lack of the technological improvements. Owing to these factors their profitabilities of the fishing businesses have been steadly lowered. The main purpose of this paper is to point out the measures required in developing the fishery right fisheries. Economic performances were estimated for 1976 with data collected in the late 1977.

• Journal of international Conference on Electrical Machines and Systems
• /
• v.1 no.2
• /
• pp.98-104
• /
• 2012

This paper presents a novel transformer isolated parallel connected full-bridge dc-dc converter using recently developed trans-Z-source network. Unlike the traditional voltage -fed or current-fed converters, the proposed converter can be open- and short-circuited without damaging switching devices. Therefore, the desired buck and boost function can be achieved and the converter reliability can be greatly improved. A 6 kW prototype dc-dc converter is built and tested to verify performances of the proposed converter.

• Journal of Electrochemical Science and Technology
• /
• v.11 no.3
• /
• pp.195-219
• /
• 2020

Today, rechargeable lithium-ion batteries are an essential portion of modern daily life. As a promising alternative to traditional energy storage systems, they possess various advantages. This review attempts to provide the reader with an indepth understanding of the working mechanisms, current technological progress, and scientific challenges for a wide variety of lithium-ion battery (LIB) electrode nanomaterials. Electrochemical thermodynamics and kinetics are the two main perspectives underlying our introduction, which aims to provide an informative foundation for the rational design of electrode materials. Moreover, both anode and cathode materials are clarified into several types, using some specific examples to demonstrate both their advantages and shortcomings, and some improvements are suggested as well. In addition, we summarize some recent research progress in the rational design and synthesis of nanostructured anode and cathode materials, together with their corresponding electrochemical performances. Based on all these discussions, potential directions for further development of LIBs are summarized and presented.

• Asia pacific journal of information systems
• /
• v.15 no.2
• /
• pp.51-63
• /
• 2005

There has been substantial research into the bankruptcy prediction. Many researchers used the statistical method in the problem until the early 1980s. Since the late 1980s, Artificial Intelligence(AI) has been employed in bankruptcy prediction. And many studies have shown that artificial neural network(ANN) achieved better performance than traditional statistical methods. However, despite ANN's superior performance, it has some problems such as overfitting and poor explanatory power. To overcome these limitations, this paper suggests a relatively new machine learning technique, support vector machine(SVM), to bankruptcy prediction. SVM is simple enough to be analyzed mathematically, and leads to high performances in practical applications. The objective of this paper is to examine the feasibility of SVM in bankruptcy prediction by comparing it with ANN, logistic regression, and multivariate discriminant analysis. The experimental results show that SVM provides a promising alternative to bankruptcy prediction.

• Journal of Korean Society for Quality Management
• /
• v.34 no.3
• /
• pp.19-30
• /
• 2006

For highly reliable products, it is difficult to assess the lifetime of the products with traditional life tests. Accordingly, a recent approach is to observe the performance degradation of product during the test rather than regular failure time. This study compares performances of three methods(i.e. the approximation, analytical and numerical methods) to estimate the parameters and quantiles of the lifetime when the time-to-failure distribution follows Weibull and lognormal distributions under a random coefficient degradation rate model. Numerical experiments are also conducted to investigate the effects of model error such as measurements in a random coefficient model.

• The Journal of the Korea Contents Association
• /
• v.6 no.2
• /
• pp.9-16
• /
• 2006

This paper proposes a scheduling algorithm for efficiently processing multimedia pakcet services in OFDMA physical system of the future broadband wireless access networks. The scheduling algorithm uses wireless channel state estimation, and allocates transmission rates after deciding transmission ordering based on class and priority policy. As the result, the proposed scheduling algorithm offers maximum throughput and minimum jitter for realtime services, and fairness for non-realtime services. In simulation study, the proposed algorithm proves superior performances than traditional round robin method.

• The Research Journal of the Costume Culture
• /
• v.10 no.1
• /
• pp.60-75
• /
• 2002

The purpose of this research is to understand the gender identity expressed in Madonna music video texts and performances. Madonna has reconstructed the fluid identities through the variations of body, images, costumes, and attitudes . The results are as fellows; ① Her punky sexuality is to be seen the flash trash look, kitsch fashion, which reconstructs a good/bad taste, modesty/immodesty, the relations of under/outer wear using bawdy sexuality through her early Virgin tour. ② Her Heterosexuality is to be seen the glamourous look, traditional images of women, which represents the passive feminity of patriarch. ③ Her sadomasochism sexuality is to be seen the bondage look of dominatrix image, which deconstructs sexual taboos; represents sexual power. ④ Her bisexuality is to be seen androgynous look, the 3rd species look using masculinity/feminity signifier, which deconstructs the stereotypes of gender roles. ⑤ Her homosexuality is to be seen the fetish fashion by drag and lesbian, which deconstructs the dichotomy of normality/perversion; opens a possibility of women subjectivity of sexual desires.