• 한국의류산업학회지
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• 제14권2호
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• pp.269-276
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• 2012

The aim of this study is to develop clothing size system according to each size interval for obese girls aged 10~12 by classifying the upper bodies. The criteria for subjects in this study were girls who had over 1.46 of the R$\ddot{o}$hrer Index. A total of 229 schoolgirls who met these criteria were enrolled. Results are as follows; 1st, 5 factors were extracted by factor analysis and 3 clusters were categorized by cluster analysis, cylinder-type, inverted triangle-type and inverted trapezoid-type. And 2nd, as a consequence of size system establishment, the basic body sizes and reference body sizes were different according to types even in commonly-appeared size names at sections of respective types. The research findings above suggest that it is necessary to figure out the obesity types according to height and bust girth sizes representing basic sizes and to design the patterns in consideration of the characteristics of obese body shapes. And it may be used as a basic data to decide the desirable output of production according to respective body types.

• Current Optics and Photonics
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• 제1권6호
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• pp.579-586
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• 2017

In this paper, we theoretically demonstrate that semiconductor optical amplifiers (SOAs) with strong wavelength dependence of gain and phase are capable of all-optical inverted and non-inverted wavelength conversion (WC) over a wide range, with the assistance of an optical filter. First, the gain dynamics and phase dynamics in a common quantum well (QW) SOA with the $In_{0.53}Ga_{0.47}As/In_{0.7322}Ga_{0.2678}As_{0.5810}P_{0.4190}$ material system are found to be strongly dependent on wavelength, which is mainly related to the wavelength dependence of the differential gain and the differential refractive-index change. Second, the wavelength dependence in an all-optical wavelength converter based on the QW SOA cascaded with a detuning band pass filter is studied. Simulations show that the quality of the converted signal has little dependence on the operation wavelength. Both inverted and non-inverted WC can be achieved, over a large wavelength range. Therefore, although the gain and phase change are strongly wavelength-dependent, the effects of this dependence can be erased by appropriate optical filtering.

• 전력전자학회논문지
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• 제16권2호
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• pp.162-172
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• 2011

본 논문에서는 LEGO NXT 마인드스톰을 사용하여 이륜 도립진자 로봇을 제작하고 MATLAB/SIMULINK를 이용한 모델 기반 설계 방법으로 제어기를 구현한 임베디드 시스템을 제안하였다. 먼저 이륜 도립진자 로봇의 모델링과 시뮬레이션을 통해 제어기의 성능과 안정성을 확인한 다음 시뮬레이션 프로그램을 직접 코드 변환하여 실험으로 설계된 제어기의 유효성을 확인하였다. 이륜 도립진자 로봇은 도립진자 원리를 이용한 자율 자세 제어를 기본 기능으로 하고 목적지까지 주행이 가능한 로봇이다. 제어기는 2차의 최적제어 방법으로 설계된 상태궤환 제어기를 이용하였다. 2차의 최적제어는 성능 지수 함수 �じ� 최소로 하는 이득행렬 �ジ� 구해 상태궤환 제어기의 이득으로 쓰는 방법으로 이득 설정 방법이 용이하여 이륜 도립진자 로봇의 제어기로 사용할 수 있다. 이륜도립진자 로봇의 제어기를 설계한 후 실험으로 자세 제어 성능과 외란 응답성, 무선 조종 주행 성능, 라인 주행 및 장애물 회피 성능을 확인하였다.

• 한국정보시스템학회지:정보시스템연구
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• 제10권1호
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• pp.257-278
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• 2001

An IR(information retrieval) index for dynamic document databases where insertion, deletion, and update of documents happen frequently should be frequently updated. As the conventional structure of IR index is, however, focused on the information retrieval purpose, its structure is inefficient to handle dynamic update of it. In this paper, we propose a new structure for IR Index, we call it Index Graph, which is organized by connecting multiple indexes into a graph structure. By analysis and experiment, we prove the Index Graph is superior to the conventional structure of IR index in the performance of insertion, deletion, and update of documents as well as the performance of information retrieval.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권3호
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• pp.993-1014
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• 2021

This paper proposes a new image retrieval method called the 3D integrated multi-index to fuse SIFT (Scale Invariant Feature Transform) visual words with other features at the indexing level. The advantage of the 3D integrated multi-index is that it can produce finer subdivisions in the search space. Compared with the inverted indices of medium-sized codebook, the proposed method increases time slightly in preprocessing and querying. Particularly, the SIFT, contour and colour features are fused into the integrated multi-index, and the joint cooperation of complementary features significantly reduces the impact of false positive matches, so that effective image retrieval can be achieved. Extensive experiments on five benchmark datasets show that the 3D integrated multi-index significantly improves the retrieval accuracy. While compared with other methods, it requires an acceptable memory usage and query time. Importantly, we show that the 3D integrated multi-index is well complementary to many prior techniques, which make our method compared favorably with the state-of-the-arts.

• East Asian Economic Review
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• 제28권2호
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• pp.221-244
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• 2024

This study examines how the independence of monetary policy changes in situations where the interest rate differential between domestic and foreign rates inverts, utilizing the trilemma indices. For analysis, this paper uses the trilemma indices developed by Kim et al. (2017) to analyze the relationship between the monetary policy independence index and the other two trilemma indices, namely the capital account openness index and the exchange rate stability index, across 45 countries from 2002 to 2018. The analysis reveals that the trilemma's validity is contingent. In particular, no statistically significant negative correlation was found between the monetary policy independence index and exchange rate stability index during periods of interest rate differential inversion. A positive correlation emerges between exchange rate stability and the independence of monetary policy, particularly when the inverted interest rate differential exceeds a certain threshold. This situation, where the exchange rate remains stable despite low domestic interest rates, implies that the central bank is effectively managing monetary policy to appropriately respond to economic conditions, which is reflected in the monetary policy independence index.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제7권4호
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• pp.274-278
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• 2007

As XML becomes the standard of digital data exchange format we need to manage a lot of XML data effectively. Unlike tables in relational model XML documents are not structural. That makes it difficult to store XML documents as tables in relational model. To solve these problems there have been significant researches in relational database systems. There are two kinds of approaches: 1) One way is to decompose XML documents so that elements of XML match fields of relational tables. 2) The other one stores a whole XML document as a field of relational table. In this paper we adopted the second approach to store XML documents because sometimes it is not easy for us to decompose XML documents and in some cases their element order in documents are very meaningful. We suggest an efficient table schema to store only inverted index as tables to retrieve required data from XML data fields of relational tables and shows SQL translations that correspond to XML full-text retrievals. The functionalities of XML retrieval are based on the W3C XQuery which includes full-text retrievals. In this paper we show the superiority of our method by comparing the performances in terms of a response time and a space to store inverted index. Experiments show our approach uses less space and shows faster response times.

• 전기전자학회논문지
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• 제26권2호
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• pp.240-248
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• 2022

픽셀의 정보를 실숫값으로 표현하는 부동소수점 형식 이미지는 HDR 이미지 등에서 사용된다. 효율적인 중간값 필터 알고리즘에 관한 연구는 다양하게 이뤄졌지만 대부분 8비트 깊이 이하의 이미지에 적용할 수 있고 부동소수점 형식 이미지에 적용할 수 있는 알고리즘은 Gil과 Werman의 알고리즘을 비롯하여 제한적으로만 존재한다. 본 논문에서는 Gil과 Werman의 알고리즘을 개선한 Kim의 알고리즘을 다시 개선하여 부동소수점 형식 이미지에 대해 효율적으로 동작하는 중간값 필터 알고리즘을 제안한다. 반복적으로 사용되는 이진 탐색 트리에 대한 중복 작업을 줄이고 역인덱스를 적용하여 실험 결과 Kim 알고리즘보다 약 10% 수행시간이 향상됨을 보인다.

• Journal of information and communication convergence engineering
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• 제7권3호
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• pp.275-280
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• 2009

While database(DB) and information retrieval(IR) have been developed independently, there have been emerging requirements that both data management and efficient text retrieval should be supported simultaneously in an information system such as health care, customer support, XML data management, and digital libraries. The great divide between DB and IR has caused different manners in index maintenance for newly arriving documents. While DB has extended its SQL layer to cope with text fields due to lack of intact mechanism to build IR-like index, IR usually treats a block of new documents as a logical unit of index maintenance since it has no concept of integrity constraint. However, In the DB-IR integrations, a transaction on adding or updating a document should include maintenance of the posting lists accompanied by the document. Although DB-IR integration has been budded in the research filed, the issue will remain difficult and rewarding areas for a while. One of the primary reasons is lack of efficient online transactional index maintenance. In this paper, performance of a few strategies for per-document basis transactional index maintenance - direct index update, pulsing auxiliary index and posting segmentation index - will be evaluated. The result shows that the pulsing auxiliary strategy and posting segmentation indexing scheme, can be a challenging candidates for text field indexing in DB-IR integration.

• 한국정보처리학회논문지
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• 제5권5호
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• pp.1109-1118
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• 1998

최근에 비디오 데이터베이스에 대하여 관심이 집중되고 있다. 비디오 문서도 텍스트 문서와 마찬가지로 계층적 논리 구조를 포함하고 있다. 사용자가 구조 질의로 이 구조를 활용한다면, 내용 질의에만 의존하는 것보다 더 큰 효과를 거둘 수가 있다. 구조 질의를 효율적으로 처리하기 위해서는 비디오의 문서 요소에 빨리 접근 할 수 있도록 지원하는 인덱스 구조가 필수적이다. 이 논문에서는 트리 구조의 비디오 문서 모형을 제시하고 비디오 문서를 위한 새로운 역 인덱스 구조를 제안한다. 그리고 이 인덱스 구조의 저장 장소 요구량과 디스크 접근 시간을 평가하고, 분석 결과를 제시한다.