Gerunds in the Modern English Period(Structure and Change)

Wim van der Wurff 한국영어학학회 1997 영어학연구 Vol.- No.3

Chow and Wald Tests for Parameter Equality under Conditions of Heteroskedasticity

Wim P,M,Vijverberg,Kyoun-Sup Chung 한국계량경제학회 2004 계량경제학보 Vol.15 No.2

본 논문은 그룹된 자료에서 각 그룹내에 이분성(within-group heteroskedasticity)이 존재할 때 다중선형 희귀방정식 상의 파라미터 동질성 검사(tests for equality of parameters) 를 위해 Chow test와 EWLS(Least squares estimators using estimated weights)-based and OLS/HCCME(Heteroskedasticity Consistent Covariance Matrix Estimators)-based Wald tests를 실시하였다. 먼저 Chow test에서는 우리가 생각하는 F-분포도와는 심각할 정도로 사르게 양방향으로 차이가 나타났다. 그리고 Wald test 역시, 특히 표본수가 적을 경우 상당한 양의 편의(bias) 현상을 발견할 수 있었다. 이러한 현상을 개선 또는 교정하기 위하여 본 논문에서는 다양한 표본을 생상한 후, bootstrap 방법을 이용하여 가장 좋은 방법을 도출하려 시도하였다. 여러 가지 방법 중 EWLS-based Wald test 방법이 만족할 정도의 가장 좋은 결과를 거둘 수 있었다. 따라서 이분성이 존재하고 특히 표본수가 적은 자료를 이용하여 파라미터 동질성 검사를 실시할 경우, EWLS-based Wald test를 이용하면 만족한 결과를 얻을 것으로 판단된다. This paper considers both the Chow and the EWLS-based and OLS/HCCME-based Wald tests for equality of parameters in linear regression across different samples under conditions of within-group heteroskedasticity. The Chow test is often severely biased compared to its presumed Fdistribution, both upward and downward. The Wald test also shows surprising amounts of "small sample" bias, even in relatively large samples. This paper proposes a bootstrap procedure that works quite satisfactorily and indicates that, even if the variance function is misspecified, the EWLS-based Wald test is generally preferred.

시험 및 수치 해석 기법

Wim Desmet 한국소음진동공학회 2010 한국소음진동공학회 학술대회논문집 Vol.2010 No.4

Simulation Techniques for Mid-Frequency Vibro-Acoustics Virtual Tools For Real Problems

Wim Desmet,Bert Pluymers,Onur Atak,Bart Bergen,Elke Deckers,Koos Huijssen,Bert Van Genechten,Karel Vergote,Dirk Vandepitte 한국소음진동공학회 2010 한국소음진동공학회 학술대회논문집 Vol.2010 No.4

Jespersen and Comparative Syntax: The Case of Negated and Embedded Imperatives

Wim van der Wurff 한국영어학학회 2004 영어학연구 Vol.- No.18

In this paper I examine the way Jespersen, in his various works, approaches the topic of the imperative. No doubt due to its quite tightly circumscribed limits, this category is usually given very short shrift in grammatical descriptions and analyses, yet closer investigation of English and a few selected other languages shows that it exhibits various syntactic properties that defy easy explanation Focussing firstly on negated imperatives (winch, for no obvious reason, are impossible in many languages) and secondly on embedded imperatives (which, counter to reasonable expectations and in spite of frequent assertions to the contrary, are grammatical in many languages), I will show that Jespersen's account of the imperative is a useful starting point for a comparative investigation of these two phenomena; moreover, his general theory of language provides several clues to the proper analysis of the results. The paper thus demonstrates (1) that the syntax and semantics of the imperative are more intricate and interesting than is commonly realised, and (2) that, far from having been superseded by modem work, Jespersen's work remains a valuable source of ideas and insights, both at the specific level of individual constructions and at the general level of understanding basic features of language.

Development of a Fatigue Experiment for the Stiffener-to-deck Plate Connection in Orthotropic Steel Decks

Wim Nagy,Benjin Wang,Bohumil Culek,Philippe Van Bogaert,Hans De Backer 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.4

Orthotropic Steel Decks (OSDs) are widely used in long span steel bridges since they are extremely light weighted and very efficient for resisting localized traffic loads. As this type of bridge deck consists of a complex network of longitudinal and transverse stiffeners, it is very sensitive to fatigue. Moreover, there is a lack of understanding concerning the actual fatigue behaviour. Therefore, a small-scale fatigue test has been designed for which the stresses would correspond with actual OSDs. Taking into account the possibilities available in laboratory conditions, the stress distribution at the considered weld does not perfectly match when using only one longitudinal stiffener. Nevertheless, relevant test data was obtained showing the dominance of weld toe cracks. In addition, beach marks are added during the tests. As a result, more information became available about the crack propagation. This information is very helpful when using fatigue assessment tools such as fracture mechanics.

Evolution of Scopus over the next decade, including research performance in South Korea

Wim J.N. Meester 한국과학학술지편집인협의회 2023 Science Editing Vol.10 No.1

No Abstract

Chow and Wald Tests for Parameter Equality under Conditions of Heteroskedasticety

Wim P.M. Vijverberg,Kyoun-Sup Chung 한국계량경제학회 2004 계량경제학보 Vol.15 No.2

This paper considers both the Chow and the EWLS-based and OLS/HCCME-based Wald tests for equality of parameters in linear regression across different samples under conditions of within-group heteroskedasticity. The Chow test is often severely biased compared to its presumed Fdistribution, both upward and downward. The Wald test also shows surprising amounts of "small sample" bias, even in relatively large samples. This paper proposes a bootstrap procedure that works quite satisfactorily and indicates that, even if the variance function is misspecified, the EWLS-based Wald test is generally preferred. 본 논문은 그룹된 자료에서 각 그룹내에 이분성(within-group heteroskedasticity)이 존재할 때 다중선형 회귀방정식 상의 파라미터 동질성 검사(tests for equality of parameters)를 위해 Chow test와 EWLS(Least squares estimators using estimated weights)-based and OLS/HCCME(Heteroskedasticity Consistent Covariance Matrix Estimators)-based Wald tests를 실시하였다. 먼저 Chow test에서는 우리가 생각하는 F-분포도와는 심각할 정도로 다르게 양방향으로 차이가 나타났다. 그리고 Wald test 역시, 특히 표본수가 적을 경우 상당한 양의 편의(bias) 현상을 발견 할 수 있었다. 이러한 현상을 개선 또는 교정하기 위하여 본 논문에서는 다양한 표본을 생성한 후, bootstrap 방법을 이용하여 가장 좋은 방법을 도출하려 시도하였다. 여러 가지 방법 중 EWLS- based Wald test 방법이 만족할 정도의 가장 좋은 결과를 거둘 수 있었다. 따라서 이분성이 존재하고 특히 표본수가 적은 자료를 이용하여 파라미터 동질성 검사를 실시할 경우, EWLS-based Wald test를 이용하면 만족한 결과를 얻을 것으로 판단된다.

Interfaces Between Rubber and Metallic or Textile Tire Cords

(Wim J . van Ooij),(Shijian Luo),(Senthil K . Jayaseelan) 한국고무학회 1999 엘라스토머 및 콤포지트 Vol.34 No.4

N/A Bonding metal and textile components to rubber has always posed a problem. In this paper, an attempt had been made to modify textile and metal surfaces for bonding with rubber. The metal surfaces were modified using silane coupling agents and textile fibers were modified using plasma polymerization techniques. Some results on adhesion of metals to a range of sulfur-cured rubber compounds using a combination of organofunctional silanes are given here. The treatment was not only effective for high-sulfur compounds but also for low-sulfur compounds as used in engine mounts and even for some semi-EV compounds. Coatings of plasma-polymerized pyrrole or acetylene were deposited on aramid and polyester tire cords. Standard pull-out force adhesion measurements were used to determine adhesion of tire cords to rubber compounds. The plasma coatings were characterized by various techniques and the performance results are explained in an interpenetrating network model.

Viewing a Person Through the Body: The Relevance of Philosophical Anthropology to Medical Education

Wim Dekkers 한국의학교육학회 2009 Korean journal of medical education Vol.21 No.4

Although the revival of medical humanities in the past three decades has emerged primarily in the US and the UK, continental Europe has a strong tradition in espousing the medical humanities, such as by advancing the anthropological movement in medicine and philosophy. In this paper, we argue that philosophical anthropology deserves a separate focus in medical education from medical ethics and philosophy of science. The focus of the paper is on the philosophical aspects of the human body to view a person ‘through the body.’ First, a short description of the anthropological movement in medicine is discussed, including its central motive ‘to introduce the subject into medicine.’ Next, the ontological and moral relationship between the person and his or her body is addressed. Drawing examples from anatomy, a so-called hemicorporectomy, organ donation, and aesthetic surgery, the concept of bodily integrity is expounded. These ideas can encourage medical students to discuss their own moral experiences during medical training and should be taught to enhance their philosophical understanding of medicine and health care.