• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.11B
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• pp.1879-1883
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• 2000

디지털 자기 기록 저장기기에서 채널 밀도가 증가하면 심각한 인접심볼 간섭과 비선형 왜곡이 야기된다. 본 논문에서는 심각한 비선형 인접심볼 간섭과 비선형 왜곡을 극복하기 위한 방법으로 기존의 등화기 대신 NLTE(neural linear transversal equalizer)를 등화기로 사용하고 검출기로는 터보 코드를 사용한 NLTE/TC 구조를 제안한다. 채널 밀도 S=2.5에서 부분 삭제가 0.7 정도 존재할 때, 코드율이 8/9일 때는 $10^{-5}$의 비트 에러율을 18dB 이후에서 만족하며, 코드율이 16/17일 때는 20dB 이후에서 만족함을 알 수 있었다. 채널 밀도 S=3에서 부분 삭제가 0.6 정도 존재할 때 코드율이 8/9일 때는 $10^{-5}$의 비트 에러율을 22dB 이후에서 만족하고, 코드율이 16/17일 때는 24dB 이후에서 만족함을 확인할 수 있었다.

• Journal of the Korea Society for Simulation
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• v.20 no.2
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• pp.19-27
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• 2011

This study investigates impact of smoothed replenishment ordering policy on the performance measures such as lead time, order fulfillment ratio, and inventory cost. We consider a two-echelon supply chain: a single retailer orders using smoothed order up to replenishment policy and a manufacturer produces the retailer's orders on a make to order basis. Simulation result confirms that lead time from the manufacturer can be reduced by smoothed ordering policy as expected. However, smoothing orders may deteriorate the customer order fulfillment ratio and inventory cost in a retailer. We also observe that variance of manufacturing time contributes more than mean of manufacturing time to both order fulfillment ratio and inventory cost. Therefore, variability of upstream manufacturing time should be minimized.

• Journal of the Korean GEO-environmental Society
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• v.12 no.2
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• pp.45-53
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• 2011

Soil nailing method was often designed by the slope stability analysis based on limit equilibrium. However, in the case of shorten length of nails, although the calculated factor of safety is within the design factor of safety, the horizontal displacement of soil nailed walls occurred above the allowable limit. In this study, relationship between the load and factor of safety, and relationship between the load and displacement ratio based on the test results were analysed. From the analysed results, the relationship between factor of safety and displacement ratio was estimated. For the mobilized horizontal displacement of the walls within the serviceability limit corresponding to the displacement of less than 0.3% displacement ratio, the calculated factor of safety by limit equilibrium analysis had to satisfy above 1.35. Also, although the minimum factor of safety is estimated above 1.35, the maximum horizontal displacement is often mobilized above 0.3% of excavation height. Therefore, it is necessary to perform the numerical analysis of soil nailed walls in the case of low shear strength or high excavation.

• The Journal of the Korea Contents Association
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• v.10 no.7
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• pp.337-343
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• 2010

Policing is regarded as a stressful occupation. Police Officers have been reported to have increased rates of cardiovascular and gastrointestinal disorders, divorce rates twice the average, and suicide rates two to six times the average. The aim of this study is to identify the effect of psychological burnout on job satisfaction and turnover intention among police officers. In the regression analysis, psychological burnout have significant relations with job satisfaction and turnover intention. In the correlation analysis, psychological burnout have a negative relation with job satisfaction and a positive relation with turnover intention. And job satisfaction have a negative relation with turnover intention.

• KOREAN POULTRY JOURNAL
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• v.19 no.12 s.218
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• pp.62-64
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• 1987

이상 열거한 위생프로그램은 결코 돈이 많이드는 어려운 작업이 아니다. 조금만 주의하면 좋은 품질의 병없는 초생추를 얻을수 있고 부화율도 최소한 0.5$\%$개선 할 수 있다. 그리고 여러분의 고객이 초생추를 받아보고 더욱 만족을 얻을 수 있다. 특히 3일령부터 7일령 사이의 육추율을 더욱 높일 수 있다. 부화장의 비누 몇장 더 소비하고, 관리 교육을 위한 약간의 노력을 투자하므로써 여러분은 더욱 우수한 하이라인 병아리로 여러분의 하이라인 고객을 만족하게 해줄 것입니다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.4
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• pp.299-306
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• 2023

Environmental pollution problems are occurring due to the negative treatment of basalt waste in Jeju Island. This study identifies the characteristics of permeable block with basalt with physical and chemical adsorption mechanisms and examines their applicability and functionality as building materials. This experiment is basic data for evaluating the functionality of the permeable block by analyzing flexural strength, compressive strength, permeability coefficient, carbon dioxide, and fine dust adsorption rate by producing a permeable block using a basalt waste rock. As the basalt waste stone replacement rate increased, the flexural strength and compressive strength tended to decrease, and as the replacement rate increased, the water permeability coefficient, absorption rate, carbon dioxide, and fine dust adsorption rate tended to increase. Therefore, it is judged that the permeable block using the basalt waste rock is superior to the existing permeable block.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.11 no.2
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• pp.195-203
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• 2018

With the explosion of SNS(social network services) users, the social commerce market has emerged as a new consumer market, and will continue to grow in recent years. Despite the market environment, however, studies are lacking as to the causes of frustration that are hurting social commerce activation. This study is based on the 'Hezbollah' 2 Factor Theory and is a study of social commerce users' satisfaction and frustration factors. For this purpose, social commerce site characteristics and user characteristics were first derived from interviews and literature reviews to confirm their relationship to satisfaction and dissatisfied products. The results showed that the price discount rate, diversity, regional infrastructure, and e-commerce familiarity resulted in the impact on the definition of satisfaction, while the price discount rate, interoperability and innovation resulted in the definition of unsatisfactory goods. It also showed that satisfaction affects the definition of intended use. In particular, the price discount rate was found to be the only factor affecting the definition of unsatisfactory as well as affecting the definition of satisfaction.

• 한국노년학
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• v.36 no.3
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• pp.541-562
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• 2016

The current study investigates the relationship and the mechanisms between bridge employment and change in marital satisfaction during midlife, using a three-wave panel dataset obtained from the Korean Baby Boomer Panel Study. A multivariate latent growth analysis reveals that the transition from career employment to bridge employment, compared to maintaining career employment, has an indirect negative effect on increase rate of marital satisfaction through the wage decrease. A steep decrease in wage following transition to bridge employment causes a lower increase in marital satisfaction. On the other hand, continuously engaging in bridge employment rather than career employment is associated with a higher increase in marital satisfaction via a higher increase in job commitment. This result implies that Baby Boomers adapt to bridge employment over time. Overall, the present study finds that the effect of bridge employment on the change in marital satisfaction during midlife varies with the duration of bridge employment. A future research needs to explore which factors can buffer the negative effect of decrease in wage during transition to the bridge employment on the change in marital satisfaction.

• The KIPS Transactions:PartC
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• v.9C no.3
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• pp.399-406
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• 2002

We consider design of multiservice network link, in which connections of constant- and adaptive-rate services arrive and leave dynamically. We propose performance analysis and design methods of these dynamic multiservice networks. A multiservice network link is modeled by a Markov chain, and data rates for adaptive-rate connections are derived using QBD (Quasi-Birth-Death) processes and matrix-geometric equations. We estimate average number of adaptive-rate connections, average data rate and average connection delay. The performance of constant-rate connections is determined from the blocking probability of the connections. Based on the performance of constant-and adaptive- rate connections, we propose a design methods of a network link to satisfy performance requirements of constant- and adaptive-rate connections (data rates, delay, blocking probability). Our methods can be used for the analysis and design of network switch supporting dynamic data and voice (video) traffic simultaneously.

• The Journal of Korean Association of Computer Education
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• v.20 no.6
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• pp.83-94
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• 2017

The purpose of this study is to analyze factors affecting elementary school students' computational thinking and SW education attitude using a 3-level multi-level models. The results of this study are as follows: First, 'Computer at home', 'SW competition participation experience', 'SW education satisfaction', and 'SW awareness' have a statistically significant effect on the initial value of computational thinking while 'SW period of education' and 'SW education experience at after school' have a statistically effect on the change rate of computational thinking. Second, 'SW awareness', 'SW education satisfaction' and 'gender' have a positive effect on the initial values of SW education attitude whereas 'SW period of education' has a slight negative influence on the change rate of SW education attitude.