Wavelet-based detection and classification of roof-corner pressure transients

Pettit, Chris L.,Jones, Nicholas P.,Ghanem, Roger Techno-Press 2000 Wind and Structures, An International Journal (WAS Vol.3 No.3

Many practical time series, including pressure signals measured on roof-corners of low-rise buildings in quartering winds, consist of relatively quiescent periods interrupted by intermittent transients. The dyadic wavelet transform is used to detect these transients in pressure time series and a relatively simple pattern classification scheme is used to detect underlying structure in these transients. Statistical analysis of the resulting pattern classes yields a library of signal "building blocks", which are useful for detailed characterization of transients inherent to the signals being analyzed.

Neo-Liberalism and Neo-Republicanism

Philip Pettit 한국학술연구원 2019 Korea Observer Vol.50 No.2

In this paper, I provide a sketch of the republican view of freedom and government. And then, looking forward, I highlight the potential of this long, shared tradition of thinking for contemporary politics. As a philosophy of government, so I argue, neo-republicanism offers a very attractive alternative to the neo-liberalism that has been recently dominant in policy circles. In my discussion, I consider republicanism first, liberalism second, since that answers to the historical order in which the doctrines appeared. The paper is in three main sections. In the first, I provide a short history of classic republican thinking. In a second, briefer section, I describe the rise of classical liberalism, which displaced republican thought over the following century. And in the third, I look at the alternatives represented in contemporary thought by neo-republicanism and neo-liberalism, highlighting what I see as the advantages of the neo-republican approach.

Application of covariance adjustment to seemingly unrelated multivariate regressions

Wang, Lichun,Pettit, Lawrence The Korean Statistical Society 2018 Communications for statistical applications and me Vol.25 No.6

Employing the covariance adjustment technique, we show that in the system of two seemingly unrelated multivariate regressions the estimator of regression coefficients can be expressed as a matrix power series, and conclude that the matrix series only has a unique simpler form. In the case that the covariance matrix of the system is unknown, we define a two-stage estimator for the regression coefficients which is shown to be unique and unbiased. Numerical simulations are also presented to illustrate its superiority over the ordinary least square estimator. Also, as an example we apply our results to the seemingly unrelated growth curve models.

Applied Horticultural Biotechnology for the Mitigation of Indoor Air Pollution

Fraser R,Torpy,Thomas Pettit,Peter J,Irga 인간식물환경학회 2018 인간식물환경학회지 Vol.21 No.6

Exposure to indoor air pollution is an emerging world-wide problem, with growing evidence that it is a major cause of morbidity worldwide. Whilst most indoor air pollutants are of outdoor origin, these combine with a range of indoor sourced pollutants that may lead to high pollutant levels indoors. The pollutants of greatest concern are volatile organic compounds (VOCs) and particulate matter (PM), both of which are associated with a range of serious health problems. Whilst current buildings usually use ventilation with outdoor air to remove these pollutants, botanical systems are gaining recognition as an effective alternative. Whilst many years research has shown that traditional potted plants and their substrates are capable of removing VOCs effectively, they are inefficient at removing PM, and are limited in their pollutant removal rates by the need for pollutants to diffuse to the active pollutant removal components of these systems. Active botanical biofiltration, using green wall systems combined with mechanical fans to increase pollutant exposure to the plants and substrate, show greatly increased rates of pollutant removal for both VOCs, PM and also carbon dioxide (CO 2 ). A developing body of research indicates that these systems can outperform existing technologies for indoor air pollutant removal, although further research is required before their use will become widespread. Whilst it is known that plant species selection and substrate characteristics can affect the performance of active botanical systems, optimal characteristics are yet to be identified. Once this research has been completed, it is proposed that active botanical biofiltration will provide a cheap and low energy use alternative to mechanical ventilations systems for the maintenance of indoor environmental quality.

DAY OF THE WEEK EFFECTS IN COMMON STOCK RETURNS : THE CASE OF THE ASIAN STOCK MARKETS

LEE, IN SUP,PETTIT, R RICHARDSON 한국경제학회 1988 The Korean Economic Review Vol.4 No.1

What’s Nest?: A Joint United States and South Korea Jeju 4·3 Tragedy Task Force to Further Implement Recommendations and Foster Comprehensive and Enduring “Social Healing Through Justice”

Eric K. Yamamoto,Miyoko Pettit 세계환경사회거버넌스학회 2014 World Environment and Island Studies Vol.4 No.1

The Joint South Korea and United States Jeju 4.3 Task Force on Social Healing Through Justice, proposed here, focuses on potential next steps in view of the strong sense of many that 4.3 reconciliation is unfinished business. It proposes a creative yet practical way for the United States, South Korea and Jeju people to engage in collaborative 4.3 social healing. Together as Part of the proposed Joint Task Force, they might more fully implement past recommendations and chart and oversee next steps toward comprehensive and enduring social healing “by doing justice. ’This proposal is based on the National Committee’s now-translated Report and the insights of scholars and the work of many of you here, along with others deeply interested in social justice. Those of us not from Jeju, or South Korea, who appreciate your invitation to participate, humbly and respectfully offer this proposal for your consideration with justice in mind.

A Generic Hybrid Model for the Simulation of Three-Dimensional Bulk Elastodynamics for Use in Nondestructive Evaluation

Choi, W.,Skelton, E. A.,Pettit, J.,Lowe, M. J. S.,Craster, R. V. IEEE 2016 and Frequency Control Vol.63 No.5

<P>A three-dimensional (3-D) generic hybrid model is developed for the simulation of elastic waves in applications in nondestructive evaluation (NDE) that efficiently links different solution strategies but, crucially, is independent of the particular schemes employed. This is an important step forward in facilitating rapid and accurate large-scale simulations, and this advances the two-dimensional (2-D) generic hybrid methodology recently developed by the authors. The hybrid model provides an efficient and effective tool for creating highly accurate simulations that model the wave propagation and scattering, enabling the interpretation of inspection data; the new methodology is verified against other numerical simulations. Furthermore, its deployment to simulate wave reflection from side-drilled holes (SDHs), comparing the results with experimental measurements, provides a realistic demonstration as well as further validation.</P>

Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery

Lavoie, C.,Domack, E. W.,Pettit, E. C.,Scambos, T. A.,Larter, R. D.,Schenke, H.-W.,Yoo, K. C.,Gutt, J.,Wellner, J.,Canals, M.,Anderson, J. B.,Amblas, D. Copernicus GmbH 2015 The cryosphere Vol.9 No.2

<P><p><strong>Abstract.</strong> We present a new seafloor map for the northern Antarctic Peninsula (AP), including swath multibeam data sets from five national programs. Our map allows for the examination and interpretation of Last Glacial Maximum (LGM) paleo-ice-flow paths developed on the seafloor from the preservation of mega-scale glacial lineations, drumlinized features, and selective linear erosion. We combine this with terrestrial observations of flow direction to place constraints on ice divides and ice domes on the AP continental shelf during the LGM time interval. The results show a flow bifurcation as ice exits the Larsen B embayment. Flow emanating off the Seal Nunataks (including Robertson Island) is directed toward the southeast, then eastward as the flow transits toward the Robertson Trough. A second, stronger 'streaming flow' is directed toward the southeast, then southward as ice overflowed the tip of the Jason Peninsula to reach the southern perimeter of the embayment. Our reconstruction also refines the extent of at least five other distinct paleo-ice-stream systems that, in turn, serve to delineate seven broad regions where contemporaneous ice domes must have been centered on the continental shelf at LGM. Our reconstruction is more detailed than other recent compilations because we followed specific ice-flow indicators and have kept tributary flow paths parallel.</p> </P>

NiCoCrAlY 및 NiAl bond coat를 사용한 단열피복코팅의 파괴거동

김길무,구성모,Meier, G. H.,Pettit, F. S. 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.10

The effect of thermal cycling on the degradation of thermal barrier coatings has been studied. A Ni-based superalloy substrate was coated with an Al-rich NiAI or NiCoCrAlY bond coat and yttria stabilized zirconia. These specimens were exposed to two types of thermal cyclings, namely, 10 minute thermal cycling and 1 hour thermal cycling, at 1100℃ in the air. The TBC system with NiCoCrA1Y bond coat showed a longer life time in 10 minute thermal cycling compared to that with NiAI, while the TBC system with NiAl showed a longer life time in 1 hour thermal cycling compared to that with NiCoCrAlY. These degradation behaviors will be discussed in detail. (Received June 15, 2004)

Recommended Method for Radioisotope Red-Cell Survival Studies

Berlin, N.I.,Dudley, R.A.,Garby, L.,Heimpel, H.,Lee, M.,Lewis, S.M.,McIntyre, P.,Mollison, P.L.,Najean, Y.,Pettit, J. The Korean Society of Nuclear Medicine 1980 핵의학 분자영상 Vol.14 No.2

혈액질환(血液疾患), 특히 용혈성빈혈(溶血性貧血)을 수반(隨伴)한 경우(境遇)에 적혈구(赤血球)의 생성(生成), 파괴과정(破壞過程)을 정확히 파악하는 것은 빈혈(貧血)의 발생기전(發生機轉) 및 병인(病因), 치료(治療), 예후(豫後) 결정(決定)에 매우 중요(重要)하다. 적혈수명측정법(赤血壽命測定法)은 최근(最近) 방사성(放射性)동위원소(同位元素)를 이용(利用)한 방법(方法)이 소개된 이래 널리 시행(施行)되어 왔다. 그러나 그 방법(方法) 및 결과(結果) 해석(解釋)에 표준화(標準化)가 되어 있지 않았던 중 1971년 ICSH (International Committee for Standardization in Hematology)에서 expert panel을 갖고 ICSH 추천 방법(方法)을 발표(發表)하였고, 본지(本誌)에서도 그 내용(內容)을 게재(揭載)한 바 있다. 1980년 ICSH는 전문기관 및 전문가의 협조(協調)를 얻어 다시 expert panal을 갖은 후 1971년에 추진한 적혈구수명측정법(赤血球壽命測定法)의 일부(一部)를 수정(修正)하여 ICSH의 표준방법(標準方法)으로 발표(發表)하였다. 개정(改正)된 표준방법(標準方法)과 1971년 ICSH추친 방법(方法)과의 차이(差異)는 다음과 같다. $^{51}Cr$표지방법중(標識方法中) 참고방법(參考方法)(Reference method)인 ACD법(法)에 수정(修正)을 가하여, ACD solution 구성성분(構成成分)이 차이(差異)가 있으며, 표지(標識)$^{51}Cr$의 양(量)을 체중당(體重當) $1.5{\mu}Ci$에서 $0.5{\mu}Ci$로 제한(制限)시켰다. 투여방법(投與方法)에 대한 언급 특히 투여하는 표지적혈구(標識赤血球)의 용적을 정확하게 측정 하기 위한 방법 4가지를 추가하였고, 검체준비(檢體準備) 과정중(過程中)의 pipet error를 방지(防止)하기위해 일정(一定)한 형태의 pipet을 사용(使用)하며, 1ml의 tuterculin syringe는 사용(使用)하지 않기로 하였다. 또한 결과분석시(結果分析時) 혈구용적(血球容積)의 항정성(恒定性)을 위해 Sodium pertectnetate($^{99m}Tc$)를 이용(利用)해 혈구용적(血球容積)을 반복(反復)해 측정(測定)하도록 하였으며 이때 사용(使用)하는 방사성동위원소(放射性同位元素)는 $^{32}P$ 대신 $^{99m}Tc$로 하였다. 결과해석시(結果解釋時) IgG 항체(抗體) 또는 IgM 항체(抗體)에 따른 차이점(差異點)에 대한 고려가 추가(追加)되었다. ICSH와 국제혈액학회(國際血液學會)에서 수정(修正)된 ICSH 표준방법(標準方法)에 의한 적혈수명측정법(赤血壽命測定法)을 널리 소개(紹介)하여 결과(結果)의 표준화(標準化)를 기하고자 연관잡지(聯관(關)雜誌)에 게재(揭載)할 것을 요청(要請)하였기에 전문(全文)을 본지(本誌)에 소개(紹介)하고자 한다.