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The Derivation of a New Blind Equalization Algorithm
Kim, Young-Kyun,Kim, Sung-Jo,Kim, Min-Taig Electronics and Telecommunications Research Instit 1996 ETRI Journal Vol.18 No.2
Blind equalization is a technique for adaptive equalization of a communication channel without the aid of training sequences. This paper proposes a new blind equalization algorithm. The advantage of the new algorithm is that it has the lower residual error than the GA (proposed by Godard) and Sign_GA (proposed by Weerackody et al.). The superior performance of the proposed algorithm is illustrated for the 16-QAM signal constellation. A Rummler channel model is assumed as a transmission medium. The performance of the proposed algorithm is compared to the GA, Sign_GA and Stop & Go Algorithm (SGA). The simulation results demonstrate that an improvement in performance is achieved with the proposed equalization algorithm.
Implementation of Pulse Shaping Filter for π/4-shift QPSK Modulator
Young-kyun Kim,Min-Taig Kim,Chull-Chai Shin 한국정보과학회 1997 Journal of Electrical Engineering and Information Vol.2 No.1
A pulse shaping filter for π/4-shift DQPSK modulator is implemented with less hardware complexity by utilizing the symmetry of premodulation digital filter and the feature of π/4-shift DQPSK modulation scheme. The proposed design gives significant reduction of memory size. The new method needs only 192 words of memory for 24-tap FIR filter, compared to the conventional method which consumes 16384 words of memory size. Moreover, as the number of FIR filter taps increases. the reduced amount of proposed method increases more and more, compared to the conventional method. A design for verification of proposed method with 32-tap FlR filter was implemented using only simple logic and 384 words of ROM plus a 8-bit adder.
황산 및 수산화나트륨처리가 낙엽송과 백합나무의 주요 화학조성에 미치는 영향
이수민 ( Soo Min Lee ),이아람 ( A Ram Lee ),안병준 ( Byoung Jun Ahn ),김용식 ( Yong Sik Kim ),양인 ( In Yang ),조성택 ( Sung Taig Cho ) 한국목재공학회 2013 목재공학 Vol.41 No.4
In this study, both mild acid and alkali treatmentswith 1.0 wt% and 2.0 wt% of H2SO4 and NaOH solution were applied to evaluatethe effects on chemical compositions of wood biomass. Yellow poplar (Liriodendron tulipifera L.) and larch (Larix kaempferi C.) were chosen due to major species planted in Korea. Chemical treatments of biomass were carried out by being soaked in either acid or alkali solution with 1:20 ratio for 72 hours at ambient temperature. Afterward, lignin, 5 major reduced sugars, ash contents and elemental composition were determined. To statistically understand the relationshipbetween samples and chemical treatments, the Tukey test, simple linear regression model and ANOVA analysis wereintroduced using a statistical software R. As results from both wet chemistry and statistical analysis, yellow poplar was more affected on the lignin and xylose contents by acid treatments under these experimental conditions. Meanwhile, larch was more affected on the composition of galactose and lignin by alkali treatments. A series of results in this study would show that equivalent chemical treatment makes a change the chemical composition of each species.
국민건강보험공단 지사의 효율성 분석과 추세 변화 -DEA/Window 분석을 중심으로-
김용민 ( Yong Min Kim ),정기택 ( Kee Taig Jung ),임구일 ( Gu Il Rhim ) 한국사회보장학회 2013 사회보장연구 Vol.29 No.3
This study initiated from the problem regognition that NHIC which is the only social insurer is need to improve its efficiency in an era of environment change such as increase of national health expenditure according to population aging and sustainability of NHI and the methodological limit of advanced researches. This study intended to figure out the cause of the inefficiency of NHIC by analysing static efficiecy through DEA and efficiency trend through DEA/Window analysis. Reseach data is collected from the internal data of NHIC Health Insurance Policy Rsearch Institute Finance and Statistics Center, National Health Insurance Statistical Annual Report and National Medical Examination Statistical Annual Report and applied to the research analysis. According to the results, most NHIC brances are need to improve Scale Efficiency (SE) and RTS (Return to Scale) analysis showed the same results. We think that this is because SE has been gradually deteriorated because internal resources of NHIC is backed up and could not follow the change of performace. This means that managerial efficiency such as human resources and administrative cost is need to be improved.
중,고령자 가구의 과부담 의료비 발생의 결정요인에 관한 연구
박진영 ( Jin Yeung Park ),김용민 ( Yong Min Kim ),정기택 ( Kee Taig Jung ) 경희대학교 경영연구원 2013 의료경영학연구 Vol.7 No.2
Despite the Korea`s achievement of the universal health coverage, there have been a number of households experiencing catastrophic and impoverishing health spending. Since Korea has one of the fastest aging populations in the world, it is one of the critical issues that the middle- and old-aged may not be well-prepared to finance needed health services. Although people with chronic conditions were shown to have a higher chance to experience catastrophic health expenditure (CHE), there have been only few studies related specific chronic diseases leading to CHE in middle- and old-aged households. Therefore, the aim of this study is to determine the impact of certain conditions middle- and old-aged households have on occurrence of CHE and find the differences between the two groups. This study used data from the Korea Welfare Panel Study conducted in 2012. We defined catastrophic expenditure if a household`s health expenditure is equal or greater than 20% of income remaining after subsistence needs have been met. The samples are divided into two groups based on the age of household head. Specifically, the middle-aged group is referred to those who are aged 45-64 and the old-aged group is 65 years or older. The results are presented by descriptive and logistic regression analysis. The results of this study showed notable differences between two groups in terms of variables affecting the occurrence of CHE. The old-aged households may experience catastrophic expenditure if they are in low-income, have no private health insurance, and have heart disease or diabetes. However, the middle-aged households are not affected by those factors except the marital status of a household head, which has an opposite effect to CHE. The common conditions which affect the CHE in both groups were education level, occupation and subjective health status of a household head, the number of household members, type of health coverage, long-term care insurance, chronic disease and cancer. People particularly in old-aged households are more needed in not only health services but also financial protection from CHE. Also, middle-aged households have distinctive characteristics and will be the largest old generation in 10 years. Therefore, health policy makers may be recognize the difference between those two groups and develop not only health policies but also a variety of health programs which may help people with chronic diseases to have better health conditions in order to keep them from facing CHE.