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Byungjin Choi 고려대학교 통계연구소 2004 應用統計 Vol.19 No.-
A sample with special missing pattern called a monotone sample or a monotone missing data pattern occurs in many applications. The statistical methods for analyzing a monotone sample have been developed by several analysts. The purpose of this paper is to introduce the maximum likelihood estimation of parameters when there is a multivariate normal sample with 2-step monotone pattern, and to present the maximum likelihood estimates of parameters in closed forms. These estimates can be obtained by maximizing the overall likelihood function which is expressed in terms of the marginal and conditional likelihood functions with respect to parameters. The maximum likelihood estimates presented are expected to he used to develop statistical methods for analyzing a multivariate normal sample with 2-step monotone pattern in applications.
Complex-stress accelerated lifetime test for high-power light-emitting diodes
Byungjin Ma,Jemin Kim IET 2012 Electronics letters Vol.48 No.8
<P>To reduce testing time and enhance the accuracy of the lifetime estimation of light emitting diode (LED) packages, a new complex-stress accelerated lifetime test (ALT) is proposed, which is based on the combination of thermal stress and optical stress. An in situ monitoring of electrical, optical and thermal characteristics took place during the ALT. The transient response of voltage change in the LED chips was used to measure the thermal properties such as junction temperature and thermal resistance to consider the thermal stress. The relative optical power and luminous flux, monitored during the ALT, were used as the optical stress and a measure of lifetime prediction. Compared to a conventional temperature-stress ALT model, the proposed ALT model describes an actual optical degradation and thus enables accurate estimation of the lifetime of LED packages.</P>
A Spatial-Domain Joint-Nulling Method of Self-Interference in Full-Duplex Relays
Byungjin Chun,Hyuncheol Park IEEE 2012 IEEE communications letters Vol.16 No.4
<P>In this letter, a spatial-domain joint-nulling method is proposed as a new means of suppressing the self-interference (or echo) occurring in full-duplex relays. Both amplify-and-forward (AF) and decode-and-forward (DF) type relays are considered. While the conventional method searches for the relay processing matrix from a discrete set of basis vectors obtained from the singular value decomposition (SVD) of the echo channel, the proposed method directly solves the optimal relay processing matrix over a continuous domain. As a result, it is shown that the proposed approach gives better performance than the conventional one in terms of the achievable rate.</P>
Antioxidant and Bioactive Films to Enhance Food Quality and Phytochemical Production during Ripening
Byungjin Min,Paul L. Dawson,Kalidas Shetty 한국축산식품학회 2005 한국축산식품학회지 Vol.25 No.1
Antioxidant films are one active packaging technology that can extend food shelf-life through preventing lipid oxidation, stabilizing color, maintaining sensory properties and delaying microbial growth in foods. Because raw, fresh and minimal processed foods are more perishable during storage or under display conditions than further processed foods, they rapidly lose their original quality. Foods are susceptible to physical, chemical, and biochemical hazards to which packaging films can be effective barriers. Although films incorporated natural (tocopherols, flavonoids and phenolic acids) or synthetic antioxidants (BHT, BHA, TBHQ, propyl gallate) have been extensively tested to improve quality and safety of various foods, food applications require addressing issues such as physical properties, chemical action, cost, and legal approval. Increased interest in natural antioxidants as substitutes for synthetic antioxidants has triggered research on use of the new natural antioxidants in films and coatings. Use of new components (phytochemicals) as film additives can improve food quality and human health. The biosynthesis of plant phenolics can potentially be optimized by active coatings on harvested fruits and vegetables. These coatings can trigger the plants natural proline-linked pentose phosphate pathway to increase the phenolic contents and maintain overall plant tissue quality. This alternate metabolic pathway has been proposed by Dr. K. Shetty and is supported by numerous studies. A new generation of active food films will not only preserve the food, but increase food's nutritional quality by optimizing raw food biochemical production of phytochemicals.
The Role of Excuses in Investing into Information Quality
( Byungjin Kwak ),( Hee-yeon Sunwoo ) 한국회계학회 2020 회계학연구 Vol.45 No.2
We analyze a manager's choice of precision of the information in a repeated cheap talk game under which the manager can excuse his lie by blaming the poor quality of the information system. In this setting, the manager can protect his reputation for the future period if the precision of information is imperfect, providing the manager with incentives to choose the poor quality of information system. However, the analyses show that even though the manager can excuse his lie relying on the imperfect precision, he finally selects perfect precision in most cases. The only exception is when he cannot publically determine the precision and he knows that his interest is not aligned with investor's. Even in this case, he randomizes his choice of information quality between perfect and imperfect precision. Otherwise, the manager chooses the perfect precision of information system. Our theoretical model provides important insights into why managers provide truthful or precise disclosures in most cases even if they are able to lie. In addition, our findings explain why they sometimes deviate from their normal practice and provide inaccurate, biased, or imprecise forecasts.
A Consulting Case of Rural Development Project in Korea
ByungJin Kwak,Kyung-Soo Noh,Ho-Kyun Shin KINFORMS 2011 Management Review Vol.6 No.2
With digital convergence era, spreading trends in terms of green management in the agricultural sector has rapidly developed with various fusion technologies. Consulting industry has not neglected to take actions into flow of rural development as alternative engines of green growth policy. Thus, this study intends to introduce a successful consulting case of rural development project in Korea. This study summarizes how the actual consulting project afferent to reduce the waste of time centered on the background, difficulties and key success concepts. Some contributions of this study are first the article is a good benchmarking practice for other local governments and NonGovernment Organizations. Second is to prove that the consulting practices are also applicable in the agricultural section as well. Third, the study improves the general prejudice with respect to rural development projects caused by aging tendency of farming population. In the future studies, more focus on the role of consulting firms and their continuous support would advance the literature.