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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Institute of Industrial Engineers
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Korean Institute of Industrial Engineers
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Volume & Issues
Volume 39, Issue 6 - Dec 2013
Volume 39, Issue 5 - Oct 2013
Volume 39, Issue 4 - Aug 2013
Volume 39, Issue 3 - Jun 2013
Volume 39, Issue 2 - Apr 2013
Volume 39, Issue 1 - Feb 2013
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A Novelty Detection Algorithm for Multiple Normal Classes : Application to TFT-LCD Processes
Joo, Tae Woo ; Kim, Seoung Bum ;
Journal of Korean Institute of Industrial Engineers, volume 39, issue 2, 2013, Pages 82~89
DOI : 10.7232/JKIIE.2013.39.2.082
Novelty detection (ND) is an effective technique that can be used to determine whether a future observation is normal or not. In the present study we propose a novelty detection algorithm that can handle a situation where the distributions of target (normal) observations are inhomogeneous. A simulation study and a real case with the TFT-LCD process demonstrated the effectiveness and usefulness of the proposed algorithm.
A k-out-of-n System Reliability Optimization Problem with Mixed Redundancy
Baek, Seungwon ; Jeon, Geonwook ;
Journal of Korean Institute of Industrial Engineers, volume 39, issue 2, 2013, Pages 90~98
DOI : 10.7232/JKIIE.2013.39.2.090
The k-out-of-n system with mixed redundancy is defined as k-out-of-n system which both includes warm-standby and cold-standby components. In case that operating components in the system fail and the system needs quick transition of standby components to operation state, the k-out-of-n system with mixed redundancy is useful for decreasing system failure rate and operational cost. Reliability-Redundancy Optimization Problem (RROP) involves selection of components with multiple choices and redundancy levels for maximizing system reliability with constraints such as cost, weight, etc. A solution methodology by using harmony search algorithm for RROP of the k-out-of-n system with mixed redundancy to maximize system reliability was suggested in this study.
Analysis of Perceived Discomfort and EMG for Touch Locations of a Soft Keyboard
Choi, Bori ; Jung, Kihyo ;
Journal of Korean Institute of Industrial Engineers, volume 39, issue 2, 2013, Pages 99~104
DOI : 10.7232/JKIIE.2013.39.2.099
With diversity of mobile services (e.g., messenger, and social network service) on smartphone, the demand of text input using a soft keyboard is increasing. However, studies on subjective and physiological responses of users for various touch locations are lacking. The present study investigated the ergonomic effects according to touch locations of a soft keyboard on smartphone. The experiment of the present study measured perceived discomfort using Borg`s CR-10 scale and electromyography (EMG) on forearm (abductor pollicis longus, and extensor digitorum communis) and thumb (abductor pollicis brevis, and first dorsal interossei) muscles. Perceived discomfort was significantly varied from 0.7 (extremely weak discomfort) to 2.5 (weak discomfort) depending on touch locations. %MVC according to touch locations was only significant at abductor pollicis brevis which varied from 10% to 23%. The experimental results of the present study can be utilized in the ergonomic design of a soft keyboard.
A Classification of Sitting Strategies Based on Seating Pressure Distribution
Choi, Younggeun ; Park, Jangwoon ; Lee, Baekhee ; Jung, Kihyo ; Sah, Sungjin ; You, Heecheon ;
Journal of Korean Institute of Industrial Engineers, volume 39, issue 2, 2013, Pages 105~108
DOI : 10.7232/JKIIE.2013.39.2.105
Drivers` sitting strategies are considered in car seat design. Existing research has identified representative sitting strategies by visual inspection of seating pressure measurements collected from a small sample size of drivers. The present study recruited 20 female and 20 male participants, measured seating pressure, and classified sitting strategies by cluster analysis. The participants` sitting postures were classified based on seating pressure distribution into mid-back and scapular, mid-back and lumbar, and lumbar sitting strategies for the upper body and hip concentrated, hip and mid-thigh concentrated, and hip and mid-thigh distributed sitting strategies for the lower body. The effects of gender and occupant package layout (OPL) on sitting strategy were nout found significant. The identified sitting strategies would be of use for the design and evaluation of an OPL and a seat.
A Study of Estimation Method for Auto-Regressive Model with Non-Normal Error and Its Prediction Accuracy
Lim, Bo Mi ; Park, Cheong-Sool ; Kim, Jun Seok ; Kim, Sung-Shick ; Baek, Jun-Geol ;
Journal of Korean Institute of Industrial Engineers, volume 39, issue 2, 2013, Pages 109~118
DOI : 10.7232/JKIIE.2013.39.2.109
We propose a method for estimating coefficients of AR (autoregressive) model which named MLPAR (Maximum Likelihood of Pearson system for Auto-Regressive model). In the present method for estimating coefficients of AR model, there is an assumption that residual or error term of the model follows the normal distribution. In common cases, we can observe that the error of AR model does not follow the normal distribution. So the normal assumption will cause decreasing prediction accuracy of AR model. In the paper, we propose the MLPAR which does not assume the normal distribution of error term. The MLPAR estimates coefficients of auto-regressive model and distribution moments of residual by using pearson distribution system and maximum likelihood estimation. Comparing proposed method to auto-regressive model, results are shown to verify improved performance of the MLPAR in terms of prediction accuracy.
Customized Web Search Rank Provision
Kang, Youngki ; Bae, Joonsoo ;
Journal of Korean Institute of Industrial Engineers, volume 39, issue 2, 2013, Pages 119~128
DOI : 10.7232/JKIIE.2013.39.2.119
Most internet users utilize internet portal search engines, such as Naver, Daum and Google nowadays. But since the results of internet portal search engines are based on universal criteria (e.g. search frequency by region or country), they do not consider personal interests. Namely, current search engines do not provide exact search results for homonym or polysemy because they try to serve universal users. In order to solve this problem, this research determines keyword importance and weight value for each individual search characteristics by collecting and analyzing customized keyword at external database. The customized keyword weight values are integrated with search engine results (e.g. PageRank), and the search ranks are rearranged. Using 50 web pages of Goolge search results for experiment and 6 web pages for customized keyword collection, the new customized search results are proved to be 90% match. Our personalization approach is not the way that users enter preference directly, but the way that system automatically collects and analyzes personal information and then reflects them for customized search results.
Airport Security Process Improving for Advanced Operation and Smart Airport Framework Design
Lee, Jaewhan ; Im, Hyeonu ; Sohn, Seichang ; Ko, Seungyoon ; Hong, Ki-Sung ; Choi, Sanggyun ; Seo, Sangwon ; Lee, Chulung ;
Journal of Korean Institute of Industrial Engineers, volume 39, issue 2, 2013, Pages 129~134
DOI : 10.7232/JKIIE.2013.39.2.129
The airport processes are restricted by some limits of performance objects as size of airport, ability of human resources, capacity of facilities and operational rules. These limitations make passenger handling difficult when passenger numbers increase. In order to solve this problem, we modeled the airport process and analyzed departure passenger arrival, scheduled security manpower under specific customer service level maintenance with mixed integer programming and validate the efficiency with simulation with adapting smart airport framework. We concluded that the airport management with information techniques can reduce waiting time within security and immigration process.
An Implementation of the B2B e-Marketplace Product Recommendation System using Genetic Algorithm
Park, Hyunki ; Ahn, Jaekyoung ;
Journal of Korean Institute of Industrial Engineers, volume 39, issue 2, 2013, Pages 135~142
DOI : 10.7232/JKIIE.2013.39.2.135
In B2B e-Marketplace for free gifts and goods, product-mix recommendation is provided frequently by analysing customer logs and/or performing collaborative and rules-based filtering. This study proposes a new process that encompasses the genetic algorithm and key working processes of B2B e-marketplace based on the previous cooperate client order data. Efficiency and accuracy of the proposed system have been confirmed by cross-confirmation of accumulated data in the e-marketplace. The system can provide better opportunities for manufactures and suppliers to select optimized product-mix without time consuming trials and errors in their B2B e-marketplace networks.
An Expected Loss Model for FMEA under Periodic Monitoring of Failure Causes
Kwon, Hyuck Moo ; Hong, Sung-Hoon ; Lee, Min Koo ;
Journal of Korean Institute of Industrial Engineers, volume 39, issue 2, 2013, Pages 143~148
DOI : 10.7232/JKIIE.2013.39.2.143
In FMEA, occurrence and detectability are not related to only failure modes itself but also their causes. It is assumed that any failure occurs after at least one cause corresponding to failure occurs in advance. Occurrence of the failure mode is described by occurrence time of its cause and elapsed time to the actual failure. Under the periodic monitoring plan, the monitoring interval is another factor to determine the detectability and occurrence of each failure mode. When a failure cause occurs, the failure does not occur if the cause is identified and remedied before it actually occurs. Under this situation, we construct an economic model for prioritizing failure modes. The loss function is based on the unfulfilled mission period. We also provide an optimal monitoring plan with an illustrative example.