• Wind and Structures
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• 제36권6호
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• pp.355-366
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• 2023

Although machine learning (ML) techniques have been widely used in various fields of engineering practice, their applications in the field of wind engineering are still at the initial stage. In order to evaluate the feasibility of machine learning algorithms for prediction of wind loads on high-rise buildings, this study took the exposure category type, wind direction and the height of local wind force as the input features and adopted four different machine learning algorithms including k-nearest neighbor (KNN), support vector machine (SVM), gradient boosting regression tree (GBRT) and extreme gradient (XG) boosting to predict wind force coefficients of CAARC standard tall building model. All the hyper-parameters of four ML algorithms are optimized by tree-structured Parzen estimator (TPE). The result shows that mean drag force coefficients and RMS lift force coefficients can be well predicted by the GBRT algorithm model while the RMS drag force coefficients can be forecasted preferably by the XG boosting algorithm model. The proposed machine learning based algorithms for wind loads prediction can be an alternative of traditional wind tunnel tests and computational fluid dynamic simulations.

• 품질경영학회지
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• 제28권3호
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• pp.104-113
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• 2000

In this paper, we present a useful system to manage the quality documents, using the concept of hypertext in HANGUEL wordprocessor, In order to develop this system, we classify all manuals, procedures and forms into files. A relationship chart of these files is constructed and files are hyperlinked according to this chart. We apply this quality document management system using hyper- text to a small precision manufacturing firm by analyzing its all kinds of quality documents. We confirm that this system effectively reduces the handling time of quality documents and supports revising task of quality documents with consistency.

• 대한수학회보
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• 제57권5호
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• pp.1307-1317
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• 2020

Let f be a nonconstant meromorphic function of hyper order strictly less than 1, and let c be a nonzero finite complex number such that f(z + c) ≢ f(z). We prove that if ∆_cf = f(z + c) - f(z) and f share 0, ∞ CM and 1 IM, then ∆_cf = f. Our result generalizes and greatly improves the related results.

• 대한수학회보
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• 제57권5호
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• pp.1083-1094
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• 2020

In this paper, we give some uniqueness theorems of nonconstant meromorphic functions of hyper-order less than one sharing partially three or four small periodic functions with their shifts. As an application, some sufficient conditions for periodicity of meromorphic functions are given. Our results improve and extend previous results of W. Lin, X. Lin and A. Wu [11].

• 대한안전경영과학회지
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• 제4권1호
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• pp.27-36
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• 2002

This paper describes "the remote automatic diagnosis and repair system which automatically reads the problems such as "out of order" occurred on equipment at customer's equipment from a remote computer center using HTTP(hyper text transfer protocol). It shows the scheme of the network configurations and features of the system. In addition, a way to implement the overall system, the specific functions of unit, and the operational specifications between the center's computer and customer's computer are also presented.also presented.

• Journal of the Korean Data and Information Science Society
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• 제25권6호
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• pp.1539-1547
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• 2014

In this paper we apply the autoregressive process to the nonlinear quantile regression in order to infer nonlinear quantile regression models for the autocorrelated data. We propose a kernel method for the autoregressive data which estimates the nonlinear quantile regression function by kernel machines. Artificial and real examples are provided to indicate the usefulness of the proposed method for the estimation of quantile regression function in the presence of autocorrelation between data.

• Korean Journal of Mathematics
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• 제29권1호
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• pp.65-73
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• 2021

In this paper, we investigate the growth properties of solutions of the non-homogeneous linear complex differential equation L(f) = b (z) f + c (z), where L(f) is a linear differential polynomial and b (z), c (z) are entire functions and give some of its applications on sharing value problems.

• 대한수학회논문집
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• 제39권1호
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• pp.105-116
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• 2024

In this paper, we prove a uniqueness theorem of non-constant meromorphic functions of hyper-order less than 1 sharing two values CM and two partial shared values IM with their shifts. Our result in this paper improves and extends the corresponding results from Chen-Lin [2], Charak-Korhonen-Kumar [1], Heittokangas-Korhonen-Laine-Rieppo-Zhang [9] and Li-Yi [12]. Some examples are provided to show that some assumptions of the main result of the paper are necessary.

• The Journal of Korean Physical Therapy
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• 제17권4호
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• pp.505-517
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• 2005

The Purposes of this study were to find complementary connectible new factors that analyzed correlation relate of Sasang Constitution and GCM Body Type in Static Posture and Dynamic Hyper/Hypo-mobility Pattern. Method of this study was asymtomatic volunteers 232(unmarried man and women), conducted from September 1 to December 31. In this main study progressing step diagnosised first, Constitution of Sasang medicine after being classified into four groups of Soyangin, Taeumin, Soeumin, Taeyangin diagnosis of GCM Body Type and progressed that related Static Posture and Dynamic Hyper/Hypo mobility Pattern. The results are as follows. Distribution of Sasang Medicine Constitution proved to be Taeyangin 13, Soyangin 66, Taeumin 67, Soeumin 86 respectively. Distribution of GCM Body Type proved I Body Type 72(31.0%), II Body Type 54(23.3%), III Body Type 89(38.4%), IV Body Type 17(7.3%). The distribution of Sasang Constitution according to GCM Body Type was that; I Body Type was distributed in the order Soeumin 34.7%(25), Taeumin 31.9%(23), Soyangin 30.6%(22), Soeumin 34.7%(25) is the most people. II Body Type was distribution of in the order Soeumin 42.6%(23), Soyangin 5.9%(14), Taeumin 24.1%(13), Soeumin 42.6%(23) is the most people. III Body Type was distribution of in the order Soeumin 37.1%(33), Taeumin 30.3%(27), Soyangin 28.1%(25), Soeumin 37.1% is the most people. IV Body Type proved high distribution each of Soeumin 29.4%(5) and Soyangin 29.4%(5). In case of main left side posture character of spine and limbs about I Body Type 72 persons with left scapular and ilium forward tilted pattern proved in the order high distribution iliac crest thigh and scapular high 70(97.2%), gluteal fold high and scapular abduction 69(95.8%), lumbar scoliosis 65(90.3%). Also, in case of right side posture character proved in the order high distribution deep gluteal fold 69(95.8%), umbilical deviation 68(94.4%). Incase of main left side posture character of spine and limbs about n Body Type 54 persons proved in the: order high distribution knee hyperextension 50(92.6%), shoulder deviation 49(90.7%) etc. Also, in case of right side posture character proved in the order high distribution pelvic deviation 53(98.1%), iliac crest thigh 52(96.3%), hip flexion and ankle inversion 51(94.4%) etc. In case of main left side posture character of spine and limbs about III Body Type 89 persons proved in the order high distribution shoulder deviation 87(97.8%), scapular abduction 86(96.6%), scapular high 85(95.5%) etc. And in case of right side posture character proved in the order high distribution pelvic deviation and iliac crest thigh 86(96.6%) etc. In case of main left side posture character of spine and limbs about IV Body Type 17 persons proved in the order high distribution pelvic deviation, lumbar sciliosis and lumbar lordosis increase 15(88.2%) etc. Also, in case of right side posture character proved in the order high distribution wrist dorsiflexion 16(94.1%), thickened achilles tendon etc.

• 폴리머
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• 제25권6호
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• pp.803-810
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• 2001

새로운 개념의 초분지형 비선형 광학 고분자 (PE-Azo/Hyper)를 AB$_2$형의 기능기를 가지는 단량체 4-[N,N-bis(hydroxyethyl)amino-4'-formyl]azobenzene (CHO-DOH)으로부터 Knoevenagel 축중합 반응을 통하여 합성하였다. 겔크로마토그래피상에서 폴리스티렌을 기준시료로 측정된 중합체의 무게평균분자량은 M$_{w}$ =61,800 (M$_{W}$ /M$_{n}$=1.86)이었고 중합체의 용해도를 조사한 결과 1-methyl-2-pyrrolidinone, N,N-dimethylformamide 등의 반양자성극성 유기용매에 잘 녹았으며 따라서 이들 용매를 이용하여 양질의 박막성형이 가능하였다. 또한 열시차 분석법으로 중합체 PE-Azo/Hvper의 열적 성질을 조사한 결과 녹는점이 관찰되지 않아 무정형으로 판명되었으며 유리 전이 온도는 $121^{\circ}C$로 나타났다. 폴링에 의하여 극성 배향된 중합체 박막의 2차 비선형 계수를 Nd : YAG 레이저 (1064 nm)를 이용하여 Maker fringe 방법으로 측정한 결과 $d_{33}$= 25.4 pm/V로 비교적 높은 값을 나타내어 초분지형 고분자에서도 극성배향이 이루어져 비선형성이 발현됨을 관찰할 수 있었다.