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황영택 三陟大學校 2001 論文集 Vol.34 No.1
The paper is concerned with the ultrasonic characteristics in weld zone of STS304 steel and the classifiability of weld defects in weld zone by using neural network. The classification of the artificial defects in weld zone is performed using the characteristics of echodynamic pattern in ultrasonic signal. Neural network and ultrasonic technique is applied to the classification and existence domain of artificial defects such as holes and notches. Results of system A,B agree fairly well with the ultrasonic results. Thus the proposed neural network is useful for the classfication and evaluation of weld defects.
황영택 三陟大學校 2004 論文集 Vol.37 No.-
This article discusses the use of pulse-echo ultrasonic testing for the inspection of adhesive bonds between Thin sheet metal bonded joints. The method is based on the ultrasonic wave analysis at the metal/adhesive interface. The physical aspects of the phenomenon, an index is defined to detect stress zone of the joint, the influence of the experimental variables(variable stress...) on the measurement is discussed. By means of a control experiment it is shown that frequency energy density in adhesive joints was confirmed the transition by stress variation.
초음파법을 이용한 STS 304 용접부의 결함 검출에 관한 연구(Ⅰ)
황영택,이정윤 三陟大學校 1998 論文集 Vol.31 No.1
In recent years, the use of austenitic stainless steel 304 has been increased in chemical plant and nuclear power plant. This paper is concerned with the detection of weld defects in heat affected zone(HAZ) by using ultrasonic method. In order to detect defects of austenitic stainless steel 304 weld zone, ITRB(Incident angle and Time axis Reference Block) and RDRB(Refraction angle and DAC Reference Block) were worked. Ultrasonic techniques is used to detect artificial defects such as holes and notches. Echoes on ultrasonic equipment CRT agree fairly well with actual measured defects. Thus the proposed ultrasonic method in this work is useful for detect defects of austenitic stainless steel 304 weld zone.
鋼의 表面硬化層깊이의 非破壞的 測定에 관한 硏究(渦電流法에 의한)
黃永鐸 三陟大學校 1993 論文集 Vol.26 No.-
The relationship between eaddy current response and case hardening depth has been studied on SM 35C(KS D-3752) and SCM 440(KS D-3711) steels which were surface hardened by high frequency induction hardening. The results obtained in this study were as follows ; 1) Case hardening depth impedance changes of each steel. The impedance decreased linearly with increasing case hardening depth. 2) For large impedance gardient between the hardened surface and core metal, the eddy current response was more sensitive to case hardening depth than for low impedance gardient.
黃永鐸 三陟大學校 1996 論文集 Vol.29 No.1
The hardenability of steel is related to its chemical composition. About this relationship, multiple regression analysis of hardenability data was proposed to explain the effect of chemical composition on a hardenability of steel. To establish the formula for calculation hardenability, given hardenability curve(U.S.S. Atlas) were quantitatively analyzed by multiple regression analysis program. The established hardenability model was applied to predict the hardenability of commercial steel fair well. The effect of chemical composition was also expressed quantitatively.
Kim, Sun‐,Young,Heo, Min Beom,Hwang, Geum‐,Sook,Jung, Youngae,Choi, Do Yeol,Park, Yeong‐,Min,Lim, Yong Taik WILEY‐VCH Verlag 2015 Angewandte Chemie Vol.127 No.28
<P><B>Abstract</B></P><P>We have designed and synthesized linear polymer‐based nanoconjugates and nanocomplexes bearing multivalent immunostimulatory ligands and also demonstrated that the synthetic multivalent nanocomplexes led to an enhanced stimulation of immune cells in vitro and antitumor and systemic immune memory response in vivo. We have developed hyaluronic acid (HA)‐based multivalent nanoconjugates and nanocomplexes for enhanced immunostimulation through the combination of multivalent immune adjuvants with CpG ODNs (as a TLR9 ligand) and cationic poly(<SMALL>L</SMALL>‐lysine) (PLL; for the enhancement of cellular uptake). The multivalent HA‐CpG nanoconjugate efficiently stimulated the antigen‐presenting cells and the multivalent PLL/HA‐CpG nanocomplex also led to an enhanced cellular uptake as well as continuous stimulation of endosomal TLR9. The mice vaccinated with dendritic cells treated with the multivalent nanocomplex exhibited tumor growth inhibition as well as a strong antitumor memory response.</P>
황영택,오승규,한준영,장철섭,윤송남,이원,김환태,Hwang, Yeong-Taik,Oh, Seung-Kyu,Han, Jun-Young,Jang, Chul-Sup,Yun, Song-Nam,Yi, Won,Kim, Hwan-Tae 대한용접접합학회 2004 대한용접·접합학회지 Vol.22 No.2
Ultrasonic signals transmitted through adhesively bonded plates were used to evaluate parameters related to attenuation and frequency in the adhesively bonded joint. The kinds of bonding materials with a different bonding thickness of constant pressure were used. And ultrasonic diagnosis was evaluated by p-wave sensor of 10MHz. FFT has been performed to determine bond-layer parameters such as effective thickness and frequency for adhesively bonded joint of A16061 plates in comparison with measured to theoretical ratios. When variable thickness exists, the ultrasonic spectrum was changed the frequency wave. The more materials thickness and the higher the frequency, the larger shift was observed. Measured ratios for cases of bond thickness and variety bonding materials are then used to determine bond parameters. The results show that the technique can be applied to the characterization of adhesively bonded joint.
오승규(Oh Seung Kyu),황영택(Hwang Yeong Taik),장철섭(Jang chul Sub),이원(Yi Won) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This article discusses the use of pulse-echo ultrasonic testing for the inspection of adhesive bonds between Thin sheet metal bonded joints. The method is based on the ultrasonic wave analysis at the metal/adhesive interface. The physical aspects of the phenomenon, an index is defined to detect stress zone of the joint, the influence of the experimental variables(variable stress...) on the measurement is discussed. By means of a control experiment it is shown that frequency wave energy in adhesive joints was confirmed the transition by stress variation.