• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.551-555
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• 2006

A new type of diffractive spatial optical modulators, named SOM, has been developed by Samsung Electro-Mechanics for projection display and other applications. A laser display in full HD format $(1920{\times}1080)$ was successfully demonstrated by using prototype projection engines having SOM devices, signal processing circuits, and projection optics.

• Journal of applied mathematics & informatics
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• v.14 no.1_2
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• pp.225-235
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• 2004

The sign central matrices were characterized by Ando and Brualdi. And, the nearly sign central matrices were characterized by Lee and Cheon. In this paper, we give another characterization of nearly sign central matrices. Also, we introduce the nearly minimal sign central matrices and study the properties of nearly minimal sign central matrices.

• The Journal of Asian Finance, Economics and Business
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• v.2 no.4
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• pp.31-38
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• 2015

During the last two decades the idea that central bank independence and transparency helps to maintain price stability, became popular among economists and central bankers. Many countries' governments give their monetary authorities higher independence and transparency to achieve the price stability goal. However, emerging countries such as Kazakhstan, suffer from high inflation. This inflation occurs largely due to a low level of independence and transparency of central banks. This research project measures the current level of independence and transparency of central bank of Kazakhstan. Indices were used to measure central bank independence and transparency. Central bank independence was measured by two types of indices: based on central bank laws (legal independence) and based on central banks governor's turnover (TOR). Developing countries have a weak legal framework, implying that a legal independence index cannot be appropriate to use as a measures of actual independence. Therefore, by paying attention to the other two indices, we can say that the central bank of Kazakhstan has a low level of independence and transparency. This, in turn, can be one of the causes of high inflation in Kazakhstan.

• Proceedings of the Korean Society of Crop Science Conference
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• 2020.11a
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• pp.135-135
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• 2020

• Proceedings of the Korean Society of Crop Science Conference
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• 2020.06a
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• pp.201-201
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• 2020

• Bulletin of the Korean Mathematical Society
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• v.37 no.4
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• pp.771-778
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• 2000

The sign-central matrices were characterized by Ando and Brualdi. In this paper, we define a nearly sign-central matrices and give a characterization of nearly sign-central matrices.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2017.10a
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• pp.279-280
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• 2017

• Bulletin of the Korean Mathematical Society
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• v.43 no.2
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• pp.343-352
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• 2006

A real matrix A is called a sign-central matrix if for, every matrix $\tilde{A}$ with the same sign pattern as A, the convex hull of columns of $\tilde{A}$ contains the zero vector. A sign-central matrix A is called a tight sign-central matrix if the Hadamard (entrywise) product of any two columns of A contains a negative component. A real vector x = $(x_1,{\ldots},x_n)^T$ is called stable if $\|x_1\|{\leq}\|x_2\|{\leq}{\cdots}{\leq}\|x_n\|$. A tight sign-central matrix is called a $tight^*$ sign-central matrix if each of its columns is stable. In this paper, for a matrix B, we characterize those matrices C such that [B, C] is tight ($tight^*$) sign-central. We also construct the matrix C with smallest number of columns among all matrices C such that [B, C] is $tight^*$ sign-central.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2017.05a
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• pp.407-408
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• 2017

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.60-60
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• 2004