• Asia pacific journal of information systems
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• v.10 no.3
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• pp.121-143
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• 2000

The enterprise resource planning(ERP) system becomes more popular as a vehicle of realizing an integrated information system, because this system not only facilitates the reengineering of processes in a firm but also provides the function of generating consolidated financial statements. However, ERP vendors have unsuccessfully provided methodologies on the customization of ERP packages although one of the important issues during the implementation of an ERP package is how to customize it. The purpose of this paper is to build a strategy on the successful customization of ERP packages. The result from the analysis of interviews with 25 consultants and experts in the ERP field recommends 14 customization strategies of an ERP package in the four areas of a firm: management, technology, organization, and environment. The analysis of the feedback from the consultants and experts generates the ranking of the 14 customization strategies.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.7 no.12
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• pp.3135-3148
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• 2013

The popularization of streaming networks and mobile devices brings a new kind of network called mobile peer-assisted streaming network. In this network, service provider not only offers downloading services, but also pre-pushes resources to users for caching. Users can download their demanded resources while working as servers for uploading the cached data. Also the mobile characteristic makes high package losing probability in this network. So we study how the service provider pre-pushes or the user downloads resources efficiently and effectively while considering the package losing in this paper. We build utility models for service provider and user, and solve the models using Bellman's theory to achieve Nash Equilibrium which shows the service provider's optimal pre-pushing speed and user's optimal downloading speed. The numerical simulation demonstrates the efficiency and effectiveness of our proposed pre-pushing and downloading scheme by comparing to the traditional scheme.

• Communications for Statistical Applications and Methods
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• v.30 no.4
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• pp.355-368
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• 2023

This article introduces the R package ELCIC (https://cran.r-project.org/web/packages/ELCIC/index.html), which provides an empirical likelihood-based information criterion (ELCIC) for model selection that includes, but is not limited to, variable selection. The empirical likelihood is a semi-parametric approach to draw statistical inference that does not require distribution assumptions for data generation. Therefore, ELCIC is more robust and versatile in the context of model selection compared to the currently existing information criteria. This paper illustrates several applications of ELCIC, including its use in generalized linear models, generalized estimating equations (GEE) for longitudinal data, and weighted GEE (WGEE) for missing longitudinal data under the mechanisms of missing at random and dropout.

• ETRI Journal
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• v.46 no.3
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• pp.473-484
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• 2024

We introduce a machine learning-based web application to help travel agents plan a package tour schedule. K-nearest neighbor (KNN) classification predicts the optimal tourists' dwelling time based on a variety of information to automatically generate a convenient tour schedule. A database collected in collaboration with an established travel agency is fed into the KNN algorithm implemented in the Python language, and the predicted dwelling times are sent to the web application via a RESTful application programming interface provided by the Flask framework. The web application displays a page in which the agents can configure the initial data and predict the optimal dwelling time and automatically update the tour schedule. After conducting a performance evaluation by simulating a scenario on a computer running the Windows operating system, the average response time was 1.762 s, and the prediction consistency was 100% over 100 iterations.

• The Magazine of the IEIE
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• v.21 no.2
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• pp.43-53
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• 1994

• The monthly packaging world
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• s.285
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• pp.65-73
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• 2017

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.3
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• pp.269-276
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• 2016

This paper presents a 2.65 GHz Doherty power amplifier with internally-matched GaN HEMT. Internal matching circuits were adopted to match its harmonic impedances inside the package. Simultaneously, due to the partially matched fundamental impedance, input and output matching networks become simpler. Bond wires and parasitic elements of transistor package were predicted by EM simulation. For the LTE signal with 6.5 dB PAPR, the implemented Doherty power amplifier shows a power gain of 13.0 dB, a saturated output power of 55.4 dBm, an efficiency of 49.1 %, and ACLR of -26.3 dBc at 2.65 GHz with an operating voltage of 48 V.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.40 no.6
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• pp.408-420
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• 2003

This paper describes a Delay Locked Loop (DLL) circuit having two advancements : 1) a dual loop operation for a wide lock-range and 2) programmable replica delays using antifuse circuitry and internal voltage generator for a post-package skew calibration. The dual loop operation uses information from the initial time-difference between reference clock and internal clock to select one of the differential internal loops. This increases the lock-range of the DLL to the lower frequency. In addition, incorporation with the programmable replica delay using antifuse circuitry and internal voltage generator allows for the elimination of skews between external clock and internal clock that occur from on and off-chip variations after the package process. The proposed DLL, fabricated on 0.16m process, operates over the wide range of 42MHz - 400MHz with 2.3v power supply. The measured results show 43psec peak-to-peak jitter and 4.71psec ms jitter consuming 52㎽ at 400MHz.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.7
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• pp.1004-1012
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• 2022

This paper contains the implementation of a game as a feature of a package tour management application with the Digital Game-based Learning approach that helps tourists learn about tourism spots. The game is written in Java language for an Android smartphone that is designed to be integrated with Content Management System (CMS) to manage the game's contents and assets. The game contains one tourism spots introductory level and five quiz game levels with each having a reward (points) and punishment (time penalty) system, then summed the results to obtain the total score from all levels. The total score will determine a tourist's performance and be listed on an online leaderboard to increase competitiveness among tourists. The conducted performance evaluation of the game shows satisfactory results of 0.9 seconds of response time from the database to the game. Implementing the game presented in this paper will potentially reduce the burden of the tour guide and increase the efficiency of managing the tour group.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.8
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• pp.1734-1740
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• 2012

In this paper, we propose a FSOURCE circuit which requires such a small switching current that an eFuse OTP memory can be programmed in the post-package state of the PMIC chips using a single power supply. The proposed FSOURCE circuit removes its short-circuit current by using a non-overlapped clock and reduces its maximum current by reducing the turned-on slope of its driving transistor. Also, we propose a DOUT buffer circuit initializing the output data of the eFuse OTP memory with arbitrary data during the power-on reset mode. We design a 24-bit differential paired eFuse OTP memory which uses Magnachip's $0.35{\mu}m$ BCD process, and the layout size is $381.575{\mu}m{\times}354.375{\mu}m$($=0.135mm^2$).