• Journal of the Institute of Electronics Engineers of Korea SP
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• v.38 no.2
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• pp.149-159
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• 2001

The conventional block-based motion prediction suffers, especially in low bit-rate video application, from shortcomings such as blocking artifacts of motion field and unstable motion estimation. To overcome the deficiency, this paper proposes one method of adopting a new motion compensation scheme based on the irregular triangular mesh structure while keeping the current block-based DCT coding structure of H.263 as much as possible. To represent the reconstructed previous frame using minimal number of control points, the proposed method designs content-adaptive irregular triangular meshes, and then, estimate the motion vector of each control point using the affine transformation-based matching. The predicted current frame is obtained by applying the affine transformation to each triangular mesh. Experiment with the several real video sequences shows improvement both in objective and subjective picture quality over the conventional block-based H.263 method.

• Polymer(Korea)
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• v.24 no.2
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• pp.281-286
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• 2000

A series of amorphous polyesters were synthesized from amorphous polyether and sebacoyl chloride. The structure and competition of the obtained aliphatic polyester were confirmed by $^1$H-NMR and FT-IR. The number average molecular weights (M$_{n}$) of the obtained polymer were ranging from 8000 ~ 15000. These polyesters showed no crystallinity and their glass transition temperatures (T$_{g}$) were around -77$^{\circ}C$. For comparison, aliphatic polyesters were also synthesized from poly(ethylene glycol) (PEG) with M$_{n}$ of 200, 400, and 1000. As the M$_{n}$ of PEG increased, the melting point of the obtained polyester increased, and the crystallinity of the obtained polyester increased showing 8.8%, 16.2%, and 46.7%, respectively.ively.y.

• The Journal of the Convergence on Culture Technology
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• v.9 no.6
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• pp.519-524
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• 2023

The study summarizes the experience of operation in the application of flipped learning to various IT-related liberal arts subjects, and proposes a specific application method. So far, most of the studies have analyzed various strategies and learner responses to flipped learning. Currently, it is the time when teachers, who are the main operators of the flipped learning class, need to study how to provide immediate feedback and application while running the relevant courses. Studies related to this are gradually coming out. In general, most of the studies on sharing reference materials through the results after applying various strategies such as developing the structure of class operation by instructors themselves, combining them with discussion classes, or developing various contents. This study proposes a method to analyze how various strategies can be applied in the subject and obtain results simultaneously with class operation by analyzing unstructured data, which is a survey that can receive immediate feedback.

• Korean Journal of Construction Engineering and Management
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• v.24 no.6
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• pp.74-80
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• 2023

This study examines the characteristics of architectural review opinions as unstructured data, focusing on the most challenging risk for developers of small and medium-sized apartment projects in response to the increasing number of single-person households in Korea. Using multidimensional analysis methods, the study analyzes the review opinions of 25 projects in B City. Correspondence analysis and MDS (Multidimensional Scale) analysis show that, consistent with prior research, the keywords related to 'structure' and 'planning' dominate architectural review opinions in B City. While the MDS model's stress is very poor at 34.4%, correspondence analysis reveals that this is due to the characteristics of unstructured data in architectural reviews. In addition, the non-structured data analyzed in this study, such as architectural review opinions, exhibited a probability distribution with low kurtosis and high skewness, as they involved various combinations and occurrences of data depending on the discretion of the review committee members and the specific formats of different local governments. This often led to the emergence of keywords that differed significantly from commonly mentioned terms. Although the study has some limitations, it provides a foundation for future detailed analysis by identifying the characteristics of architectural review opinions as unstructured data.

• Journal of Oral Medicine and Pain
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• v.24 no.4
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• pp.375-385
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• 1999

타석에 관한 연구는 타석증을 보이는 환자에 대한 임상적 특징, 진단 및 치료에서부터 타석의 성분 및 구조 등에 이르기까지 다양한 범위에 걸쳐 이루어지고 있다. 타석의 미세구조에 관한 연구는 타석의 미세구조가 다양한 형태인 것으로 보고되고 있으며, 특히 최근 타석증의 치료에 새롭게 소개되고 있는 체외충격파쇄석술은 타석의 구조에 따라 그 효과가 영향을 받을 수 있을 것으로 사료된다. 이에 저자는 인간 타석의 미세구조에 관한 기본 자료가 필요할 것으로 사료되어 한국인 중년 여성으로부터 적출된 악하선 타석을 광학현미경 및 주사전자현미경을 이용하여 미세구조적 특징을 관찰한 결과, 다음과 같은 결론을 얻었다. 1. 타석은 중심부의 핵, 핵 주변의 층상구조 및 외피막으로 이루어져 있었다. 2. 핵은 비정형의 중심과 상대적으로 균질의 외곽부위로 구성되어 있었다. 3. 핵 주변은 대부분 동심원적인 층상구조를 보였지만 일부분에서는 균질의 구조를 보였다. 4. 타석 단면의 전체직경과 중심부 핵의 직경은 각각 $3,500{\mu}m$와 $1,500{\mu}m$였고, 층상구조를 이루는 각 층의 두께는 위치에 따라 약 $10{\sim}40{\mu}m$ 이내였다.

• Journal of the Earthquake Engineering Society of Korea
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• v.1 no.3
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• pp.37-44
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• 1997

In this paper, the inelastic behavior of an asymmetric tall building is investigated. The asymmetry in rigidity caused by the structural asymmetry induces torsional as well as lateral deformation. The inelastic analysis of such an asymmetric structure is difficult to carry out with a planar model and thus requires a full three dimensional model. In this paper a 102 story unsymmetric tall building is analized by static push-over procedure and its behavior is investigated. The analysis are performed with and without floor rotation to compare the results. According to the results the static behavior of the model building, as expected, turned out to be dependent heavily an the asymmetry of the plan shapes of the building.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.214-217
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• 1999

본 논문은 비균일, 비선형 분포를 가지는 비정형 하이드로폰 어레이를 견인하여 목표물로부터 발생된 협대역 신호에 대한 DOAs(Direction-Of-Arrivals) 및 도플러 주파수 정보를 동시에 추정하는 기법을 제안한다. 균일분포 선형 어레이를 견인하는 전통적인 처리기법은 DOA 추정에 국한되어 활용될 수 있다는 한계점을 가지고 있을 뿐 아니라 목표물의 특징을 파악할 수 있는 중요한 정보 중의 하나인 발생신호의 주파수 성분을 추정하기 위해서는 주파수 스펙트럼을 별도로 구성하여야하는 등의 난점을 지니고 있어 조기 경보 능력의 치명적인 제한점을 가질 수 있으며, 하이드로폰 어레이의 구조가 외부적인 환경요인에 의하여 선형을 유지하지 못함으로써 추정능력을 저하시킬 수 있다. 본 논문에서는 이러한 한계성을 극복하기 위하여 불규칙한 곡면을 가지고 있는 모함의 측면에 하이드로폰 어레이를 설치하여 목표물의 DOA 뿐만 아니라 모함의 이동에 의해 목표물과 사이에서 발생하는 도플러 주파수까지 동시에 추정하는 기법을 제안한다 특별히, 도플러 주파수 추정은 취득신호에 대한 퓨리에 변환과정을 거치지 않고 추정함으로써 계산량을 감소시킬 수 있다.

• Journal of KIISE:Databases
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• v.28 no.4
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• pp.723-731
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• 2001

As XML has become and emerging standard for information exchange on the World Wide Web it has gained attention in database communities of extract information from XML seen as a database model. Data in XML can be mapped to semistructured dta model based on edge-labeled graph and queries can be processed against it Here we propose new query optimization techniques using DTDs(Document Type Definitions) which have the schema information about XML data. Our techniques reduce traditional index techniques Also, as they preserve source database structure, they can process many kinds of complex queries. we implemented our techniques and provided preliminary performance results.

• Cross-Cultural Studies
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• v.49
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• pp.1-32
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• 2017

This paper discusses the structural and meaning features of causative from/for V-ing constructions as complement and provides insight on their grammatical characteristics revealed from alternation between prepositions for and from in nonfinite V-ing complement clause constructions. Guided by empirical data, this paper demonstrates that there are three types of syntactic patterns classified by the main verbs in these constructions and that these three syntactic types are closely linked with the meaning. These classifications are supported by the passivizations and aspect. In addition, this paper suggests that the function of for and from followed by nonfinite V-ing clause should be treated as a preposition introducing nonfinite V-ing clauses.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2001.04a
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• pp.296-303
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• 2001

In the evaluation of asymmetric buildings, torsional effects should be considered by three-dimensional analysis. However, this analysis is time-consuming and requires great efforts. The goal of this study is to give a comprehensible and simple procedure in the seismic evaluation by using two-dimensional analysis of asymmetric buildings so that practicing engineers can easily adapt it to their work.