• Journal of the Korea institute for structural maintenance and inspection
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• v.24 no.2
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• pp.15-22
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• 2020

In this paper, seismic ground motion generation method based on the observbation data from the Korea Meteorological Administration is proposed to predict the acceleration time history at an arbitrary location after earthquake. The proposed method assumes that the magnitude of the seismic accelrations obtained from the near stations decreases linearly with the distance from the epicenter to the corresponding station and the accelerations measured at the adjacent stations are assumed to have similar maximum acceleration and time shape functions. These two assumptions allow for the prediction of seismic acceleartion motion without geotechnical information where no seismic accelerometer is installed. This study verified the applicability of the prediction method using seismic observation data from Gyeongju Earthquake (2016), Pohang Earthquake (2017) and Sangju Earthuqkae (2019). The comparison results show that the proposed method is effective for predicting the seismic acceleration response spectrum and time history at arbitary locations.

• Journal of KIISE:Computer Systems and Theory
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• v.37 no.3
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• pp.127-137
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• 2010

As large-scale computational applications in various scientific domains have been utilized over many integrated sets of grid computing resources, the difficulty of their execution management and control has been increased. It is beneficial to refer job history generated from many application executions, in order to identify application‘s characteristics and to decide selection policies of grid resource meaningfully. In this paper, we apply a statistical technique, Plackett-Burman design with fold-over (PBDF), for analyzing grid environments and execution history of applications. PBDF design identifies main factors in grid environments and applications, ranks based on how much they affect to their execution time. The effective factors are used for selecting reference job profiles and then preferable resource based on the reference profiles is chosen. An application is performed on the selected resource and its execution result is added to job history. Factor's credit is adjusted according to the actual execution time. For a proof-of-concept, we analyzed job history from an aerospace research grid system to get characteristics of grid resource and applications. We built JARS algorithm and simulated the algorithm with the analyzed job history. The simulation result shows good reliability and considerable performance in grid environment with frequently crashed resources.

• Journal for History of Mathematics
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• v.17 no.4
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• pp.87-100
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• 2004

There is great enthusiasm among many mathematics educators to seek to understand how mathematical history can be employed to emphasize the usefulness of mathematics and to make it even more useful. This study focused on reviewing the history of mathematics to provide a 'source of insight.' In this study, the reasons for including the history of mathematics in the mathematics curriculum were divided into three domains: cognitive, affective, and sociocultural. Each domain included the followings: mathematical thinking and understanding; development of a positive attitude and increase motivation; and last, humanistic facets and sociocultural experience. At the same time, we need to develope a pedagogical approach that allows educators to use history properly. Furthermore, we must integrate the historical topics into regular curricula including the syllabus historically-informed grounds.

• The Journal of Korean Medical History
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• v.14 no.1
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• pp.61-78
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• 2001

Time and places of hot spring-bath were diverse such as at succeeding to the throne, after abdication, during Crown Prince and etc. Generally, average staying time was about 20 days. Beside the healing purpose, hot spring-bath was taken to inspect the people's conditions, to reduce compulsory labor or tax, to carry out "Kwagoh", the old state examination or to console the people.

• The Journal of Korean Medical History
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• v.16 no.1
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• pp.17-38
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• 2003

This paper considers how the Chinese medicine has been indigenized in Korea, focusing on historical facts. The effort Korean people put in to make their native medicine in each period of time is studied in the paper. The common characteristic of Korean medicine all through the time is that healing the fellow public with their native medicine was the principle.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2002.10a
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• pp.161-168
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• 2002

To evaluate seismic performance of bridges, two procedures far capacity spectrum method are presented. The capacity spectrum procedures include the reduction factor-ductility-period relationship in order to construct the inelastic demand spectra from the elastic demand spectra. Application of the procedures is illustrated by example analysis. Maximum displacements estimated by the procedures are compared to those by inelastic time history analysis for several artificial earthquakes. The results show that the maximum displacements estimated by the procedures are, on overall, smaller than those by the inelastic time history analysis

• Journal of Korean Medical classics
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• v.22 no.2
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• pp.275-283
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• 2009

The "Naegyeongseupyubangron(內經拾遺方論)", written by Nakyonggil(駱龍吉), is an ancient book of Bangron(方論). The exact time period of this book is unknown. To estimate its written time, we compared the contents of this book to other sources on the cause of diseases, the description of symptoms, the transmission of diseases, and treatments. In addition, we analyzed the features of the book by comparing it to other books of Bangron(方論). As a result, we estimated the approximate time period that it was written and gained a better understanding of the ancient medicine. We reached several conclusions through this study. 1. The approximate time period of "Naegyeongseupyubangron(內經拾遺方論)" is that of the Southern Song(南宋) dynasty of China, probably after "Saminbang(三因方)" between 1174 and 1279. 2. Nakyonggil(駱龍吉) was influenced by Wangbing(王冰), Sonsamak(孫思邈), Yuhagan(劉河間), Jinmutaek(陳無擇). and he influenced "Uibanggo(醫方考)". 3. The "Naegyeongseupyubangron(內經拾遺方論)" is the most comprehensive book among the books of Bangron(方論) because of its analysis of the "Hwangjenaegyeong(黃帝內經)" and its connection to the treatment of ancient diseases in Oriental Medical History.

• The Journal of Korean Medical History
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• v.29 no.2
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• pp.1-16
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• 2016

The purpose of this study is to analyze how medical texts in Joseon Dynasty have changed in time and to understand their characteristics. Medical texts that reflect the medical standards of the time were enable us to look into how medical bureaucrats were trained and education policies related to the training. Chinese medicine influenced Joseon Dynasty's medicine in different ways at different times. Before the Imjin War, Joseon dynasty's medicine was largely under the influence of the Song dynasty's medicine. After the war, the four noted physicians of Jin-Yuan era had increasingly more significant influence, along with the introduction of Ming dynasty's medicine. The facts found through this study include : 1) the basic courses were composed of Chandomac (纂圖脈), Dongingyeong (銅人經), and Boncho (本草); 2) Josenization of medical division system was established for the first time during the reign of King Sejo (世祖), and updated throughout the time of the King Seongjong (成宗) and King Sun Jo (宣祖); 3) Hyangyak (鄕藥) education with medical texts was limited to some periods like King Seongjong (成宗) and King Sejo (世祖); 4) the high proportion of Bangseo (方書) in the early era gradually decreased, and more of specialized and comprehensive medical books came to find their way into the standard curriculum.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.19 no.2
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• pp.117-124
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• 1983

In rough seas, actual behaviours of a ship may not be estimated by the linear strip theory, because of Nonlinearities due to the hull shape, bottom slamming and bottom and/or bow-flare slamming. In case of slamming, impulsive hydrodynamic pressure occurs on the fore body surface of the ship, resulting hull vibration called whipping, by which the ship may suffer from serious structural damages and the impact pressure, depends critically on the relative velocity at re-entry. In this paper, the Time history of impact froce at each station, the longitudinal distribution of impact force at critical time, the Time history of acceleration at F.P. and the Time history of Bending moment at midship are illustrated. That is, authors analyzed Dynamic response of container ship to be subjected slamming impact force.

• Wind and Structures
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• v.37 no.3
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• pp.245-254
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• 2023

In this paper, the wind-induced response of Jiayuguan wooden building (world cultural heritage) in Northwest China was studied. ANSYS finite element software was used to establish four kinds of building models under different working conditions and carry out modal analysis. The simulation results were compared with the field dynamic test results, obtaining the model which reflects the real vibration characteristics of the wooden tower. Time history data of fluctuating wind speed was obtained by MATLAB programming. Time domain method and ANSYS were used to analyze the wind-induced vibration response time history of Jiayuguan wooden building, obtaining the displacement time history curve of the structure. It was suggested that the wind-induced vibration coefficient of Jiayuguan wooden building is 1.76. Through analysis of the performance of the building under equivalent static wind load, the maximum displacement occurs in the three-story wall, gold column and the whole roof area, and the maximum displacement of the building is 5.39 cm. The ratio of the maximum stress value to the allowable value of wood tensile strength is 45 %. The research results can provide reference for the wind resistant design and protection of ancient buildings with similar structure to Jiayuguan wooden tower.