• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1202-1206
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• 2004

In the future, a machine-tool will be more improved in the form of a knowledge evolution based device. In order to develop the knowledge evolution based machine-tool, this paper proposes the structure of knowledge evolution and the scheme of a dialogue agent among agent-based modules such as a sensory module, a dialogue module, and an expert system. The dialogue agent has a role of interfacing with another machine for cooperation. To design of the dialogue agent module in M2M(Machine To Machine) environment, FIPA-OS and ping agent based on FIPA-OS are analyzed in this study. Through this, it is expected that the dialogue agent module can be more efficiently designed and the knowledge evolution based machine-tool can be hereafter more easily implemented.

• 연구논문집
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• 통권34호
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• pp.113-119
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• 2004

Recently, the conventional concept of a machine-tool in manufacturing systems is changing from the target of integration to the autonomous manufacturing device based on a knowledge evolution. Subsequently, a machine-tool has been the subject of a cooperation through an advanced environment where an open architecture controller, high speed network and internet technology are contained In the future, a machine-tool will be more improved in the form of a knowledge evolution based device. In order to develop the knowledge evolution based machine-tool, this paper proposes the structure of knowledge evolution and the scheme of a dialogue agent among agent-based modules such as a sensory module, a dialogue module, and an expert system. The dialogue agent has a role of interfacing with another machine for cooperation. To design of the dialogue agent module in M2M(Machine To Machine)environment, FIPA-OS and ping agent based on FIPA-OS are analyzed in this study. Through this, it is expected that the dialogue agent module can be more efficiently designed and the knowledge evolution based machine-tool can be hereafter more easily implemented.

• 전자공학회논문지C
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• 제35C권12호
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• pp.40-48
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• 1998

본 논문에서는 rail-to-rail 복합입력단을 갖는 증폭회로의 옵셋전압을 보상해주기 위한 방법을 제안하고 집적회로로 구현하였다. 두 개의 보조증폭회로와 옵셋보상 커패시터들을 사용하여 NMOS 차동쌍과 PMOS 차동쌍의 옵셋을 각각 보상하고, ping-pong control을 사용하여 연속시간 동작이 가능한 3V rail-to-rail CMOS 증폭회로를 설계하였다. 설계된 증폭회로를 0.8㎛ single-poly double metal CMOS 공정으로 제작한 후 성능을 측정한 결과, 옵셋보상후의 옵셋전압은 옵셋보상전에 비해 약 20배정도 감소하였다.

• 한국작물학회지
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• 제51권3호
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• pp.259-268
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• 2006

1. 자포니카 벼 114 계통에 대해 다양성과 근연관계를 확인하고자 MITE 중에서 mPing family를 이용하여 MITE-TD 기법으로 분석하여 품종간의 다양성 정도를 산출한 결과 마커들의 PIC 값이 $0.293{\sim}0.499$ 범위로 나타났다. 2. 두 개의 mPing primer와 selective primer인 BfaI+G 와 BfaI+C의 조합을 이용하였을 때, 공시계통인 114개의 자포니카 벼 전체를 구분할 수 있었다. 3. NTSYS-pc를 이용한 근연관계 분석 결과, 유사계수의 범위는 0.802에서 부터 0.081까지였고, 자포니카 벼 114 품종은 크게 5 개의 그룹으로 분류되었다. 4. 8 개의 MITE-AFLP marker 연관분석을 밀양 23호/합천앵미 3호 조합 RIL을 이용하여 실시한 결과, 이들은 염색체 l번, 2번, 4번, 5번, 7번 그리고 9번에 각각 위치함을 확인하였다.

• Communications for Statistical Applications and Methods
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• 제23권5호
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• pp.385-397
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• 2016

The stress-strength models have been intensively investigated in the literature in regards of estimating the reliability ${\theta}$ = P(X > Y) using parametric and nonparametric approaches under different sampling schemes when X and Y are independent random variables. In this paper, we consider the problem of estimating ${\theta}$ when (X, Y) are dependent random variables with a bivariate underlying distribution. The empirical and kernel estimates of ${\theta}$ = P(X > Y), based on bivariate ranked set sampling (BVRSS) are considered, when (X, Y) are paired dependent continuous random variables. The estimators obtained are compared to their counterpart, bivariate simple random sampling (BVSRS), via the bias and mean square error (MSE). We demonstrate that the suggested estimators based on BVRSS are more efficient than those based on BVSRS. A simulation study is conducted to gain insight into the performance of the proposed estimators. A real data example is provided to illustrate the process.

• Communications for Statistical Applications and Methods
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• 제23권6호
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• pp.543-553
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• 2016

The validity of statistical inference depends on proper randomization methods. However, even with proper randomization, we can have imbalanced with respect to important characteristics. In this paper, we introduce a method based on ranked auxiliary variables for treatment allocation in crossover designs using Latin squares models. We evaluate the improvement of the efficiency in treatment comparisons using the proposed method. Our simulation study reveals that our proposed method provides a more powerful test compared to simple randomization with the same sample size. The proposed method is illustrated by conducting an experiment to compare two different concentrations of titanium dioxide nanofiber (TDNF) on rats for the purpose of comparing weight gain.

• Journal of Microbiology
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• 제40권1호
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• pp.33-37
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• 2002

An enzymatic reaction for the production of D-alanine from D-aspartic acid and pyruvate as substrates by a thermostable D-amino acid aminotransferase (D-AAT) was investigated at various conditions In the temperature range of 40-70$\^{C}$ and pH range of 6.0-9.5. The D-AAT was produced with recombinant E. coli BL21, which hosted the chimeric plasmid pTLK2 harboring the D-AAT from the novel thermophilic Bacillus sp. LK-2. The enzyme reaction was shown to follow the Ping Pong Bi Bi mechanism. The K$\_$m/ values for D-aspartic acid and pyruvate were 4.38 mar and 0.72 mM, respectively. It was observed that competitive inhibition by D-alanine, the product of this reaction, was evident with the inhibition constant K$\_$i/ value of 0.1 mM. A unique feature of this reaction scheme is that the decorboxylation of oxaloacetic acid, one of the products, spontaneously produces pyruvate. Therefore, only a catalytic amount of pyruvate is necessary for the enzyme conversion reaction to proceed. A typical time-course kinetic study skewed that D-alanine up to 88 mM could be produced from 100 mM of D-aspartic acid with a molar yield of 1.0.

• 지능정보연구
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• 제26권3호
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• pp.71-90
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• 2020

최근 전 세계 보험업계에도 기계학습, 자연어 처리, 딥러닝 등의 인공지능 기술 활용을 통한 디지털 전환이 급속도로 확산하고 있다. 이에 따라 인공지능 기술을 기반으로 한 인슈어테크와 플랫폼 비즈니스 성공을 이룬 해외 보험사들도 증가하고 있다. 대표적으로 중국 최대 민영기업인 평안보험그룹은 '금융과 기술', '금융과 생태계'를 기업의 핵심 키워드로 내세우며 끊임없는 혁신에 도전한 결과, 인슈어테크와 디지털플랫폼 분야에서 괄목할만한 성과를 보이며 중국의 글로벌 4차 산업혁명을 선도하고 있다. 이에 본 연구는 평안보험그룹 인슈어테크와 플랫폼 비즈니스 활동을 ser-M 분석 모델을 통해 분석하여 국내 보험사들의 인공지능 기술기반 비즈니스 활성화를 위한 전략적 시사점을 제공하고자 했다. ser-M 분석 모델은 기업의 경영전략을 주체, 환경, 자원, 메커니즘 관점에서 통합적으로 해석이 가능한 프레임으로, 최고경영자의 비전과 리더십, 기업의 역사적 환경, 다양한 자원 활용, 독특한 메커니즘 관계가 통합적으로 해석되도록 연구하였다. 사례분석 결과, 평안보험은 안면·음성·표정 인식 등 핵심 인공지능 기술을 활용하여 세일즈, 보험인수, 보험금 청구, 대출 서비스 등 업무 전 영역을 디지털로 혁신함으로써 경비 절감과 고객서비스 발전을 이루었다. 또한 '중국 내 온라인 데이터'와 '회사가 축적한 방대한 오프라인 데이터 및 통찰력'을 인공지능, 빅데이터 분석 등 신기술과 결합하여 금융 서비스와 디지털 서비스 사업이 통합된 디지털 플랫폼을 구축하였다. 이러한 평안보험그룹의 성공 배경을 ser-M 관점에서 분석해 보면, 창업자 마밍즈 회장은 4차 산업혁명 시대의 디지털 기술발전, 시장경쟁 및 인구 구조의 변화를 빠르게 포착하여 새로운 비전을 수립하고 디지털 기술중시의 민첩한 리더십을 발휘하였다. 환경변화에 대응한 창업자 주도의 강력한 리더십을 바탕으로 인공지능 기술 투자, 우수 전문인력 확보, 빅데이터 역량 강화 등 내부자원을 혁신하고, 외부 흡수역량의 결합, 다양한 업종 간의 전략적 제휴를 통해 인슈어테크와 플랫폼 비즈니스를 성공적으로 끌어냈다. 이와 같은 성공사례 분석을 통하여 인슈어테크와 디지털플랫폼 도입을 본격 준비하고 있는 국내 보험사들에게 디지털 시대에 필요한 경영 전략과 리더십에 대한 시사점을 줄 수 있다.

• Communications for Statistical Applications and Methods
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• 제24권3호
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• pp.241-254
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• 2017

Drawing a sample can be costly or time consuming in some studies. However, it may be possible to rank the sampling units according to some baseline auxiliary covariates, which are easily obtainable, and/or cost efficient. Ranked set sampling (RSS) is a method to achieve this goal. In this paper, we propose a modified approach of the RSS method to allocate units into an experimental study that compares L groups. Computer simulation estimates the empirical nominal values and the empirical power values for the test procedure of comparing L different groups using modified RSS based on the regression approach in analysis of covariance (ANCOVA) models. A comparison to simple random sampling (SRS) is made to demonstrate efficiency. The results indicate that the required sample sizes for a given precision are smaller under RSS than under SRS. The modified RSS protocol was applied to an experimental study. The experimental study was designed to obtain a better understanding of the pathways by which positive experiences (i.e., goal completion) contribute to higher levels of happiness, well-being, and life satisfaction. The use of the RSS method resulted in a cost reduction associated with smaller sample size without losing the precision of the analysis.

• Journal of applied mathematics & informatics
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• 제15권1_2호
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• pp.277-284
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• 2004

An m-transversal to a family of convex sets in the plane is an m-point set which intersects every members of the family. One of Grubaum's conjectures says that a planar family of translates of a convex compact set has a 3-transversal provided that any two of its members intersect. Recently the conjecture has been proved affirmatively (see [4]). In the present paper we provide a different and straightforward proof for the conjecture for the family of translates of a closed trapezoid in the plane and give several concrete 3-transversals.