• Journal of the Korean Institute of Intelligent Systems
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• v.8 no.2
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• pp.82-95
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• 1998

In this paper, we propose a text-independent speaker identification system which has a classifier composed of two parts; to calculate the degree of likeness of each speech frame and to select the most probable speaker from the entire speech duration. The first part is realized using RBFN which is selforganized through learning and in the second part the speaker is determined using a con-tbination of MAXNET and delayed summings. And we use features from linear speech production model and features from fractal geometry. Closed-set speaker identification experiments on 13 male homogeneous speakers show that the proposed techniques can achieve the identification ratio of 100% as the number of delays increases.

• Journal of the Korean Data and Information Science Society
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• v.24 no.6
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• pp.1439-1448
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• 2013

The analysis of variance for randomized block design or two way classification data is well known. In this paper, particularly, we considered two stage nested design in which the levels of one factor is not identical for different levels of another factor. We investigate the structural properties of two stage nested design and the properties of error sum of squares for random effect model. For the application of two way nested design, we consider two-period crossover design which is used commonly for the equivalence test to bio-similar product. The confidence interval estimation of the difference of two population means in the crossover design is discussed based on statistical package SPSS.

• Journal of Conservation Science
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• v.36 no.6
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• pp.483-493
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• 2020

In this paper, we present a nondestructive analysis using X-ray and microscopic investigation to detect the structure, manufacturing technique and preservation status of the Goryeo lacquered box Inlaid with Mother-of-pearl Chrysanthemum and Scroll Design (Goryeo Lacquered Box). We confirm that the Goryeo Lacquered Box consists of the soft wood as the basic material. The soft wood was coated with textile and then lacquered. The box structure of the Goryeo Lacquered Box was formed of wooden boards with wood plants added to the side, after processing into a trefoil-shaped. The wooden sides of the Goryeo Lacquered Box were cut at regular intervals for easier processing into a curved shape. Moter-of-pearl, tortoiseshell, and metal wire were used to decorate the surface. mother-of pearl was the cutting processing, and tortoiseshell was used for back coloring. The metal line was constructed using one line and twist line.

• Information Systems Review
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• v.13 no.3
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• pp.141-163
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• 2011

The advancement of information technologies including the Internet has affected the way of social information processing as well as brought about the paradigm shift to the information society. Accordingly, it is very important to study the process of social information processing over the digital media through which social information is generated, distributed, and led to social consensus. In this study, we analyze the mechanism of social information processing, identify a process model of social consensus and institutionalization of the results, and finally propose a set of information processing characteristics on the internet media. We deploy the ethnographic approach to analyze the meaning of group behavior in the context of society to analyze two major events which happened in Korean society. The formation process of social consensus is found to consist of 5 steps: suggestion of social issues, selective reflection on public opinion, acceptance of the issues and diffusion, social consensus, and institutionalization and feedback. The key characteristics of information processing in the Internet is grouped into proactive response to an event, the changes in the role of opinion leader, the flexibility of proposal and analysis, greater scalability, relevance to consensus making, institutionalization and interaction. This study contributes to the literature by proposing a process model of social information processing which can be used as the basis for analyzing the social consensus making process from the social network perspective. In addition, this study suggests a new perspective where the utility of the Internet media can be understood from the social information processing so that other disciplines including politics, communications, and management can improve the decision making performance in utilizing the Internet media.

• Communications of Mathematical Education
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• v.14
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• pp.61-70
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• 2001

수학은 추상적인 학문이다. '추상'은 몇 개 또는 무한히 많은 사물의 공통성이나 본질을 추출하여 파악하는 사고작용이다. 이렇게 추상된 것들을 모아 분류를 하고 그 다음에 이름을 붙이는 것이 바로 개념이 형성되는 과정이고 수학자가 수학을 하는 과정이다. 이 개념들은 여러 가지 모양으로 결합하여 스키마라고 부르는 개념 구조를 형성하게 되는데, 이 스키마는 수학적 사고를 하는데 매우 중요한 역할을 하여 수학을 개념적으로 이해하는데 도움을 주며, 새로운 지식을 얻는데 필요한 필수적인 도구가 된다. 본 논문에서는 연속적인 수열의 합의 공식에 대하여 학생들이 Skemp가 말한 '관계적 이해'를 할 수 있도록 스키마를 이용하여 문제를 해결할 수 있는 모델과 원주의 스키마를 이용한 생활 속의 문제를 제시하여 학생들이 공식을 암기하기보다는 수학의 구조를 파악하고 연계성을 이해함으로서 능동적인 구성활동을 유발하여 수학에 대한 흥미를 느낄 수 있도록 도움을 주고자 한다.

• Review of KIISC
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• v.14 no.6
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• pp.1-13
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• 2004

인터넷 게시판에서 실명을 사용할 경우 자유로운 토론이 어려우며 사용자 프라이버시를 침해할 우려가 있는 반면, 가명을 사용할 경우 자유고운 토론은 가능하지만 오히려 상호 비방이나 유언비어 등의 부작용이 있을 수 있다. 따라서 기본적으로는 가명을 이용해서 포스팅하고록 허용하지만, 필요한 경우 분산된 여러 개체간의 합의에 의해서 조건부 실명 복원(혹은 다른 말로 조건부 추적)이 가능한 게시판이 구현된다면 매우 유용할 것이다. 그러나 기존 체계에서 가명만을 이용하여 조건부 추적 가능한 익명성을 제공하기란 쉽지 않다. 또한 현존하는 익명성 제공 기법들을 기존의 인증 체계나 인증서 체계에서 수용하기는 매우 어렵다. 본 논문에서는 이와 같이 인터넷 게시판에서 익명성을 제공할 수 있는 기술들을 간략히 살펴보고, 특히 기존의 공개키기반구조, 즉 X.509 인증서 체계를 이용하여 익명게시판은 구현한 수 있는 기술에 대해서 소개하도록 한다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.8
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• pp.878-883
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• 2003

New feeding structures using linearly and exponentially tapered lines to planar microstrip resonators are proposed. These can overcome the design problems from coupling losses and impedance mismatching by increasing the coupling efficiency. The variation of its feeding angle is evaluated for the insertion loss and bandwidth and the feedline length is optimized at ${\lambda}_g$/2. The ring resonators and patches fed by the tapered line have been designed and implemented. The experimental results show that the insertion loss is enhanced by about 7 dB. Both rings and antennas are better matched, without disturbing the single-mode resonance or distorting their radiation pattern

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.7
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• pp.661-668
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• 2004

A novel method to reject the spurious signals which are occurred at Weaver-type low-IF transmitter was proposed in this paper. The spurious signals are generated by the gain and phase imbalances of I/Q channel or imperfect characteristics of 90$^{\circ}$ phase shifter in local oscillator for I/Q channel source. By deriving the gain and phase-based functions from RF spurious signal with the channel imbalance information, the lie channel imbalances were deduced as functions with magnitude and sign dependent on I/Q channel imbalance degree. The proposed method compensates the estimated I/Q channel imbalances by correlation values between the down-converted signal obtained by squaring the output signal itself using a simple mixer and the modified baseband signal. By comparing two signals after A/D conversion, the magnitude and sign of each type of imbalances can be determined separately and simultaneously. Based on the I/Q channel imbalance compensation, the spurious signals can be reduced by adjusting the gain and phase values of I or Q channel signal. The way to estimate the channel imbalances of the up-conversion mixer was presented and verified by using theoretical derivations and computer simulations.

• The Bulletin of The Korean Astronomical Society
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• v.40 no.1
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• pp.86.1-86.1
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• 2015

고대 천문학의 대표적인 관측기기로 혼의가 있다. 중국도 일찍 혼의가 도입되어 천체 관측에 활용된 것으로 보인다. 중국 고대의 선기옥형이라는 기기가 한(漢) 대에 접어 들어 서양에서 도입된 혼천설의 영향을 받아 혼의로 발전하였다. 초창기 혼의에는 주천도수와 24방위의 눈금을 새겼고, 원주율을 3으로 적용하였다. 한말(漢末)에 혼천설에 따라 혼의 안에 지구를 만들고 혼천의 또는 혼천상이라고 불렀다. 혼천설의 구조를 적용하기 위해 비교적 자세한 원주율의 값이 알려지면서 혼의의 정밀한 눈금을 제작하는 계기를 마련하였다. 더불어 수 개의 환을 혼의에 추가하여 2층 구조의 혼의를 개발하였다. 당(唐) 대에 이르러 육합의, 삼신의, 사유의로 구성된 혼의의 3층 구조가 완성되었다. 송(宋) 대에는 혼의와 혼상에 수격식 자동운행장치를 도입하여 혼천의라고 하고, 이전의 관측용 혼의를 동후의(銅候儀)라고 불렀다. 조선 세종 대에 제작한 혼천의는 송(宋) 대의 자동운행이 결합된 혼의였고, 동후의의 관측기능을 대신하여 간의를 사용하였다. 그 재원은 각각 오징의 "서찬언"과 "원사"에서 빌려왔고, 이를 "제가역상집"에 정리하였다. 혼의의 환에는 한 개의 원주에 주천도수, 12시백각, 24방위 중 한 종류의 눈금을 그렸다. 그러나 간의에서는 한 개의 원주에 두 개의 눈금을 그리는 방법이 시작되었다. 이러한 눈금제작 방식은 조선에서 새롭게 개발된 일성정시의에 적용되었다.

• Korean Security Journal
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• no.11
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• pp.129-157
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• 2006

With rapid social change, by culminating the social hazards and the safety problems about it are on the increase too. According to the needs for the safety the demand of the private guard & security provided the safety and security service against danger is also increasing. As the need for the safety is increasing, so recently the private guard & security industry is extended. Therefore the purpose of this study is to grasp and carry out researches into the legal structure on the Security contract, is to analyze the formation of contract and find out the ensuing problem in order to prevent or settle the dispute which is apt to occur between the specific client and the security companies. In order to minimize the dispute going with security relationship in particular, it is necessary that one should write down the agreed contents as the document explicitly to make a security contract with the parties. Hereupon in the plan which standardizes the security contract with each parties autonomously, it is suggested that this study should present the model of Dispute Resolution Clause Especially it is the best means that it is amicable consultation or negotiation as the effective way of settlement methods of private dispute arising from the concerned parties. In inevitable case it recommends the method which solves the dispute by means of an arbitration than litigation at administration of justice(in terms of jurisdiction). If the parties wish to settle the disputes by arbitration, they must come to an arbitration agreement in the form of a arbitration clause in the security contract. After the test and evaluation through application utilizing it in actual security field, the security standard contract regulates about it and this terms should widely apply a individual case to whole industry.