• 한국축산식품학회지
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• 제37권1호
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• pp.139-146
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• 2017

Response surface methodology (RSM) is a useful set of statistical techniques for modeling and optimizing responses in research studies of food science. In the analysis of response surface data, a second-order polynomial regression model is usually used. However, sometimes we encounter situations where the fit of the second-order model is poor. If the model fitted to the data has a poor fit including a lack of fit, the modeling and optimization results might not be accurate. In such a case, using a fullest balanced model, which has no lack of fit, can fix such problem, enhancing the accuracy of the response surface modeling and optimization. This article presents how to develop and use such a model for the better modeling and optimizing of the response through an illustrative re-analysis of a dataset in Park et al. (2014) published in the Korean Journal for Food Science of Animal Resources.

• Journal of the Korean Data and Information Science Society
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• 제11권2호
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• pp.247-255
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• 2000

완전이면교배를 블록화하는 매개디자인으로는 일반적으로 부분적으로 균형된 불완비 블록계획을 사용한다. 이때 블록화하는 매개디자인으로 삼각형 PBIBD를 사용하기 위해서는 대응되는 모수를 갖는 삼각형 PBIBD를 찾아야 한다. 특정한 모수를 갖는 균형된 불완비 블록계획의 쌍대계획이 삼각형 PBIBD가 되는 성질을 이용하면 삼각형 PBIBD를 새로 찾아야 하는 번거로움 없이 블록 완전이면교배를 설계할 수 있다. 이를 만족하는 블록 완전이면교배를 설계하는 방법과 디자인을 제시하였다.

• Journal of the Korean Data and Information Science Society
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• 제26권2호
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• pp.347-354
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• 2015

본 논문은 균형불완비블럭설계 (balanced incomplete block design)의 자료분석에 사영을 이용한 블럭내 분석 (intrablock analysis)방법을 다루고 있다. 블럭내 분석을 위해 단계별 방법 (stepwise procedure)에서 유도되는 분석모형을 이용하고 있다. 단계별 방법의 적용으로 인해 모형행렬로 주어지는 사영공간이 변동요인에 따른 부분공간들로 직교분할됨을 보여주고 있다. 단계별 과정에서 변동요인에 따른 변동량을 구하기 위해 해당하는 효과벡터의 계수행렬에 근거한 사영의 구조적 형태를 기술하고 있으며 상호직교하는 부분공간으로의 사영을 이용하여 블럭효과에 적합된 처리효과의 변동량를 구하는 과정을 구체적으로 다루고 있다. 또한, 사영에 의해 처리효과를 구하는 과정을 제시하고 있으며 단계별로 잔차벡터를 이용하여 모형설정하는 방법과 고유벡터에 의한 추정가능함수의 구성과 추정가능성을 논의하고 있다.

• 응용통계연구
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• 제28권2호
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• pp.151-158
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• 2015

본 논문은 균형불완비블록설계(balanced incomplete block design)에서 사영에 근거한 블록내(intrablock) 분석과 블록간(interblock) 분석을 다루고 있다. 블록간 분석을 위한 행렬모형을 제시하고 블록간 추정벡터를 구하는 방법을 다루고 있다. 처리효과의 블록내 추정벡터와 블록간 추정벡터의 분산공분산행렬을 규명하고 공분산행렬의 구조적 특성으로 두 추정벡터 간에 상관성이 없음을 보여주고 있다. 처리효과의 상관성없는 두 추정벡터를 이용한 결합추정에서 가중치를 구하는 방법으로 공분산행렬을 이용할 수 있음을 다루고 있다. 또한 처리효과에 적합된 블록변동량의 계산은 상수적합법을 이용한 블록제곱합과 일치함을 보여주고 있다.

• International journal of advanced smart convergence
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• 제10권1호
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• pp.12-23
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• 2021

This paper proposes a low power radio frequency receiver front-end where, in a single stage, single-balanced mixer and voltage-controlled oscillator are stacked on top of low noise amplifier and re-use the dc current to reduce the power consumption. In the proposed topology, the voltage-controlled oscillator itself plays the dual role of oscillator and mixer by exploiting a series inductor-capacitor network. Using a 65 nm complementary metal oxide semiconductor technology, the proposed radio frequency front-end is designed and simulated. Oscillating at around 2.4 GHz frequency band, the voltage-controlled oscillator of the proposed radio frequency front-end achieves the phase noise of -72 dBc/Hz, -93 dBc/Hz, and -113 dBc/Hz at 10KHz, 100KHz, and 1 MHz offset frequency, respectively. The simulated voltage conversion gain is about 25 dB. The double-side band noise figure is -14.2 dB, -8.8 dB, and -7.3 dB at 100 KHz, 1 MHz and 10 MHz offset. The radio frequency front-end consumes only 96 ㎼ dc power from a 1-V supply.

• Computers and Concrete
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• 제28권5호
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• pp.487-495
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• 2021

The use of prestressed concrete box girder bridges built by segmentally balanced cantilevers has bloomed in the last decades due to its significant structural and construction advantages in complex topographies. In Colombia, this typology is the most common solution for structures with spans ranging of 80-200 m. Despite its popularity, excessive deflections in bridges worldwide evidenced that time-dependent effects were underestimated. This problem has led to the constant updating of the creep and shrinkage models in international code standards. Differences observed between design processes of box girder bridges of the Colombian code and Eurocode, led to the need for a validation of in-service status of these structures. This study analyzes the long-term behavior of the Tablazo bridge with data scarcity. The measured leveling of this structure is compared with a finite-element model that consider the most widely used creep and shrinkage models in the literature. Finally, an adjusted model evidence excessive deflection on the bridge after six years. Monitoring of this bridge typology in Colombia and updating of the current design code is recommended.

• Clinical and Experimental Reproductive Medicine
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• 제24권3호
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• pp.393-398
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• 1997

Cytogenetic analysis was performed in 1321 couples and 141 women with history of abnormal reproductive outcome during 1988-1996. The use of high resolution banding technique and fluorescence in situ hybridization (FISH) in the chromosome analysis has made the precise evaluation of chromosome aberrations. The prevalence of balanced chromosomal translocation carriers were 3.74% (104/2783 patients). 70 cases (2.52%) were reciprocal translocation carriers and 34 (1.22%) had Robertsonian translocations. Chromosome aberrations were more frequent in women (73 cases) than in men (31 cases). No phenotypical abnormalities were found in all carriers, but they experienced abnormal reproductive outcomes such as recurrent spontaneous abortions, anomalous offsprings or infertility problem. Prenatal diagnosis was carried out on 36 subsequent pregnancies in balanced translocation carriers. The fetal karyotypes showed that 12 cases (33%) were normal, 22 (61%) were balanced translocations, and two (6%) were unbalanced translocations. It is concluded that the prevalence of balanced chromosomal translocations in patients with abnormal reproductive outcome is higher than that of the normal population. Most of the fetal samples showed normal karyotypes or balanced translocations. Although the incidence of chromosomal imbalance in the fetuses was relatively low in prenatal diagnosis, individuals with balanced translocations are predisposed to abnormal offspring with partial trisomy or monosomy. Therefore we recommend that genetic counselling and cytogenetic prenatal diagnosis for translocation carriers have to be offered to prevent recurrent chromosomal abnormal babies.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2002년도 정기학술대회
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• pp.411-414
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• 2002

A class of block designs for general combining ability comparisons within two groups of inbred lines in diallel crosses is given. Use is made of balanced block designs obtained by cyclically developing a single initial block.

• 대한가정학회지
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• 제42권1호
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• pp.181-195
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• 2004

The purpose of the study was to explore the degree of children's access to media and the relationship between the use of media and language development of Korean-Chinese bilingual children in Yanji, China. Questionnaires were answered by 258 4th graders and their parents. The results showed that the children had an access to a variety of media. The children's use of language(Korean/ Chinese) differed to the type of media： they had more access to Korean language in the use of newspapers/magazines, books, and radio, and to Chinese language in the use of computer. They had comparatively a balanced access to Korean/chinese language in the use of TV. Stepwise regression analyses revealed that the children's access to Chinese language in the use of media, proficiency of a parent's Chinese language, and a parent's affection were related to proficiency of the children's Chinese language. Implications are derived from the use of media in development of bilingualism.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 1989년도 추계학술발표회논문집
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• pp.59-64
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• 1989

Daylight is regarded by most people as preferred light source for interior lig-hting. With poper design, daylight can save electric lighting during daytime. This paper attemptes to show that bett-er use of daylight might be the balanced use of supplementary artificial lighting at times and places where the natural 1-ighting is inadequate with consequent c-ost and energy saving.