2018, Vol.13, No.1

A Greenhouse Control System Based on Best-Fitted PID Controller to Minimize Energy Cost

Vasanth Ragu , Myeongbae Lee , Cho Yong Yun and 2 other persons | 2018, 13(1) | pp.1~9 | number of Cited : 0

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Research on Factors Affecting Smartphone App Market Selection: App Market Platform Provider’s Perspective

Ho Lee , Jae Sung Kim , Kyung Kyu Kim and 1 other persons | 2018, 13(1) | pp.11~23 | number of Cited : 2

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This paper empirically investigates the factors that influence the consumer choice of an app market based on the rational choice theory. The app market is the only channel where a consumer can buy smartphone apps, which give various functional convenience and are considered to be a major contributor to the proliferation of smartphones. Analyses of 281 questionnaires show that usability and structural guarantees as benefit factors significantly influence the app market choice. From the cost perspectives, both monetary and non-monetary conversion costs are found to significantly influence the app market choice. On the other hand, customer trust, information quality, and market image were found to have no significant effect on app market selection. In particular, Korean app market platform providers (KT, LG U +) seem to be superior in terms of structural guarantees, such as customer center operation and damage compensation regulations, compared to overseas app market platform operators (Google). However, in the case of the Google App Market, it is pre-installed on all Android phones, so it is not inconvenient to install additional apps to use other app market. This is disadvantageous to domestic app market platform operators, and it is necessary to establish a policy solution point. In terms of operator costs, both monetary and non-monetary conversion costs have a significant impact on app market choice. In particular, non-monetary conversion costs have a negative impact on Korean app market platform operators. It can be explained that the service expectation level of the domestic app market is low and it is recognized that the time cost factor such as membership is large for new users to use. It seems to be necessary to improve the domestic app market business. Meanwhile, extant research on smartphone apps focuses on the purchase of apps themselves, but not on the selection of the app market itself. In order to fill in this gap, this study focuses on the determinants of app market selection, including the characteristics of an app market and the switching costs.

A Study on the Direction of Aircraft Maintenance Education Based on Job Interest Type and Aptitude

Park heui-kwan | 2018, 13(1) | pp.25~36 | number of Cited : 1

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Development of a Medical Software Test System based on IEC 62304, IEC 60601-1, ISO 14971

A Young Park , Kiwon Song , Jeong-Hwan Park | 2018, 13(1) | pp.37~44 | number of Cited : 0

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A Study on the Factors Analysis to Loyalty of the Press Website Users

Jaehyeon An | 2018, 13(1) | pp.45~53 | number of Cited : 0

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The management crisis of the media is transforming the way in which traditional media control strategies differ. There have been newspaper clippings of printing press and switching to web pages to reduce printing costs, and greatly reduced the number of investigative staff needed to produce print newspapers and reorganize the web news for web news content. There is also speculation that profits from the traditional news media will not fall short of the revenue growth of the Internet. Recently, it has emerged as a critical topic in the media's survival strategy for how to design an internet news media strategy. Newspaper readers do not read news from paper newspapers and use various media such as web and mobile to consume news. As newspapers consume content through various platforms, the media market has become the exclusive market for several media companies. As the paper's readership falls flat, newspapers appeal to readers through various channels to overcome the limitations of paper media. Newspapers, which have remained unilaterally aware of the way they communicate independently of their readers, are now searching for images of their readers as flexible companies that provide customized contents and provide customized contents to readers. Efforts are being made to secure revenue by securing loyal customers and utilizing Internet media. Efforts to secure loyal readers will not be alone yesterday. Securing the reader's loyalty to the press website is an urgent task that must be addressed urgently. It is analyzed what components of the website's can stay on site longer and also lead to revisit. It is suggested how the organization's website and how the media outlets should be activated. The results of this study show that the content fidelity is very important to the user's loyalty to the user's loyalty and return time. It is needed to control the contents of the media website and use the website of the media website to enhance the relevance of the media website, and to organize the website specifically for the media website.

Users' Neglect on Requests from Software Updating Messages : From the Construal Level Theory Perspective

Sangcheol Park | 2018, 13(1) | pp.55~67 | number of Cited : 0

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Development of Smartphone Mobile Apps for Hearing Aid Using Sound Frequency Translation

Jae Ho Kim | 2018, 13(1) | pp.69~76 | number of Cited : 0

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EEG Variation Analysis on Difference of Autostereoscopic 3D Image Quality

Choi Yoo Joo , 서정근 | 2018, 13(1) | pp.77~86 | number of Cited : 1

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Sung Hwan Chun , Choi Yoo Joo , 서정근 | 2018, 13(1) | pp.87~103 | number of Cited : 0

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Over 130,000 protein structures are solved and deposited in the PDB with molecular structural models of high resolution determined by X-ray diffraction or NMR studies. Those conventional methods for structural determination and similarity comparison are not applicable for therapeutic proteins due to their own technical limitations. However, assessing structural comparability for therapeutic proteins is critical during biopharmaceutical development or manufacturing processes. Currently, those assessments were done by various spectroscopic methods but those methods are not giving specific structural information. Moreover, recent developments such as single angle X-ray scattering (SAXS) techniques can provide low-resolution structural models for proteins more easily than those for X-ray diffraction or NMR studies. These enable us to develop fast and reliable method for the similarity assessment of low-resolution surface models of therapeutic proteins using geometric shape descriptor. Our descriptor consists of two features, local and global. The local feature calculates the distance distribution for each vertex from the center in 510 bins. For global feature, the ratio, x to y axis and x to z axis from the surface model of proteins were determined. A geometric shape descriptor is then constructed by combining local and global features with weights. We applied this geometric shape descriptor to assess structural similarity for the therapeutic protein, insulin models. Our geometric shape descriptor can clearly classify human insulin models and insulin analog models which having locally different structures. The performance of the geometric shape descriptor was evaluated by comparing to the conventional method of the root mean square deviation measure (RMSD) which computes the minimum average distance between the backbones of superimposed. The result shows that the performance of the global shape descriptor is comparable to that of RMSD. This provides potential applications to classify protein structure and compare low-resolution protein structures for EM and SAXS.

Development of Education Curriculum for Aviation-IT Convergence Security Manpower Training

김성종 | 2018, 13(1) | pp.105~110 | number of Cited : 1

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A Study on Ultra Multi-channel Audio Coding for Realistic Audio Services

Kwangki Kim | 2018, 13(1) | pp.111~120 | number of Cited : 2

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Reliability Analysis of Systems Using Level (λ, 1) Interval-valued Fuzzy Sets Considering the Widths

Cho, Sang Yeop | 2018, 13(1) | pp.121~127 | number of Cited : 5

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Comparison of System Resource Usage for Screen Image Transmission

Kwon Oh-Sung | 2018, 13(1) | pp.129~137 | number of Cited : 0

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Performance Evaluation of the Error Recovery based Object Relation in SCTP

CHOI WON KEUN | 2018, 13(1) | pp.139~146 | number of Cited : 1

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Compensation for Consumer Damage and Dispute Resolution Caused by Personal Data Leakage - Focusing on Compensation for Emotional Distress -

LEE JONG SIK | 2018, 13(1) | pp.147~160 | number of Cited : 1

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Comparison of Energy and Power Characteristics According to the Types of Solar Panels and Batteries

Kwon Oh-Sung | 2018, 13(1) | pp.161~168 | number of Cited : 2

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At environment not connected to the power-grid for electronic devices, the general solution is solar energy system. Solar energy systems consistes of the three components solar panels, battery charger and solar batteries. In this paper, we analysis the relation of the three components and the total power amount and characteristics of our soloar system. We implement a solar energy generation system with 250 Watt solar panels and analysis the obtained data from our solar system during 39 days. The experimantal items are the placement direction of solar panels, the duration of sunshine, and the power change according to seasonal variation. We measure the characteristics of chemical and lithium-ion batteries for solar power charging and the solar power capability of our implemented system. We experiment the change of panel direction with a predefined angle degree 30. We can not obtain meaningful different values of power amount between the South and South-West direction, but rather can get similar values of the two direction testing according to the short experimental period. To measure the duration of sunshine, we measure 1.50 V and 12.0 V entry time each. we can confirm the entry time correspond to the sunrise and sunset time of the days. In case of lithium-ion batteries, the entry process is more smooth than the chemical betteries. In our experimentals, the chemical batteries has seen a rapid increase in the 12.0V entry graph. The both batteries has shown a stable power generation in the middle of day with sufficient sunshine amount. Our experimental result demonstrate that the chemical batteries has 0.28V power variation, the chemical batteries has 0,05V power variation respectively. We confirm that we can construct the efficient solar power generation system according to the our experimentals of the panel direction, the characteristics of batteries.

Improving Predictive Accuracy of User-based Collaborative Filtering Using Word2Vec

Kang, BooSik | 2018, 13(1) | pp.169~176 | number of Cited : 11

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Word2Vec is a most popular method in text mining area, recently. It converts words to vectors using association among words in sentences. Similar words are nearly located in the vector space. Improving predictive accuracy of recommender algorithms is a major work in the area of recommender systems. User-based collaborative filtering recommends products using the information about product preference of Neighbors. This study proposed a method to compute user similarity using vectors of users by Word2Vec instead of using traditional method. In order to use Word2Vec, we separate sentences first, and then find corpus that is meaningful word set of the sentences. For using Word2Vec in user-based movie recommender, we find users that have seen same movies first, we substitute an user to a word and user list of a movie to corpus of one sentence. There can be several methods to compose the sentences in recommender systems. This study considers two methods, first method constructs a sentence per movie and second method can construct several sentences per movie. After sentence construction, it enters corpus of sentences into Word2Vec and computes vectors of users, and then computes user similarity by coefficient corelation method using the vectors of users. Using the similarity, it recommends products by user-based collaborative filtering. To validate, the proposed methods were applied to filmtrust dataset. The experimental results of repeating 10-fold cross validation three times showed that mean MAE of user-based collaborative filtering(wvCF3.0) applying Word2Vec improved the predictive accuracy greatly than that of conventional collaborative filtering method(uCF). Also, it showed that the sentence expansion method(wvCFthree) constructing several sentences per movie is better than the one sentence method(wvCF3.0) constructing one sentence per movie for improving the predictive accuracy. To test statistical significance between uCF and wvCF3.0, and between wvCF3.0 and wvCFthree, we experimented paired t-test and confirmed the statistical significance.

The Design and Performance Analysis of Fed Inset Patch Antenna for ISM Band

Choi, Jae Yeon | 2018, 13(1) | pp.177~185 | number of Cited : 1

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KJCKorea
Journal Central

Journal of Knowledge Information Technology and Systems 2023 KCI Impact Factor : 0.89

2018, Vol.13, No.1