Liquid Metal Embrittlement of Resistance Spot Welded 1180 TRIP Steel: Effect of Electrode Force on Cracking Behavior

Du‑Youl Choi,Ashutosh Sharma,Sang‑Ho Uhm,Jae Pil Jung 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1

Liquid metal embrittlement (LME) caused cracking of Galvanized transformation induced plasticity steels was investigatedduring resistance spot welding (RSW). Effect of electrode force (3–5 kN) for a weld time of 400, and 800 ms on crack resistanceof TRIP steel was examined in relation to LME phenomenon. The microstructural characteristics of spot weld jointsand LME cracking tendency were investigated using dye penetration tests, optical microscopy, scanning electron microscopytogether with energy dispersive X-ray spectroscopy. It was found that as the electrode force increases, the crack size decreasesdue to a fast increase in crack tip temperature which rises further with more holding time up to 800 ms in high temperaturezone. Least amount of crack size was observed at 5 kN electrode force and 400 ms of welding time. Finally, the experimentalresults have also been simulated by finite element modeling (FEM) to find suitable mechanism of crack formation, and acombination of 4 kN and 400 ms was suggested for the crack free and less thermal deformation in the spot welded TRIP steel.

A correlation for heat of vaporization of pure compounds

Dušan K. Grozdanic,Jovan D. Jovanovic 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6

Twenty-seven selected equations were tested on 162 compounds with 1958 calorimetric data for their abilities to reflect the temperature influence on the heat of vaporization of pure compounds. A new equation is recommended (overall percent deviation 0.27% and percent deviation 0.59% above 0.9Tr).

Where Does Value-Added Flow in Gross Exports, Mr. Newton? Global Supply Chains and New Regionalization's Effects in the Asia-Pacific

Dušan Steinhauser 세종대학교 경제통합연구소 2023 Journal of Economic Integration Vol.38 No.3

18세기 '군민일체(君民一體)' 사상의 구조와 성격 : 하곡(霞谷) 정제두의 경학(經學)과 정치운영론을 중심으로 on hakok Chong Che Du's political thought in Gyunghak

정두영 조선시대사학회 1998 朝鮮時代史學報 Vol.5 No.-

Generic Competency Model: Business Graduate Key Competencies for Successful Working at Trading Companies - Case Study from the Czech Republic

Radim Duš,다 People&Global Business Association 2021 Global Business and Finance Review Vol.26 No.4

Purpose: The aim of this paper is to create a generic competency model based on the entry-level positions’ requirements of human resource managers in trading companies operating in the Czech Republic. The proposed model should define an optimal set of key competencies that a competent graduate of business degree should have to be successful in specific selection processes for different graduate jobs in trading companies and thus be successful in performing job duties. Design/methodology/approach: The research question for this study was which key competencies business graduates need the most for entry-level positions in the field of trading and which ideal behavior is expected for such competencies. Within the questionnaire survey, the degree of significance of the defined key competencies was subsequently determined. The target population consisted of trading companies with 25 - 249 employees based and operating in the Czech Republic that are willing to hire fresh graduates for entry-level positions. The quantitative data was finally obtained from 419 companies. On the basis of the data analysis results, a generic competency model of a university graduate of business degree was created. Findings: The generic model developed on the basis of the data from trading companies consists of two parts. It defines an optimal set of 6 key competencies as well as the expected behavior that a competent business graduate should have to succeed in specific selection processes for various positions in trading companies that require university education, and subsequently, to be successful in performing jobs in the trade sector. Research limitations/implications: The research limitations are caused mainly by two factors: the company size and products that the trading company is (re)selling. Although specific key competencies can be rated as very important by two different recruiters in the questionnaire, requirements, and expectations of a small company operating in an extremely competitive environment may be significantly higher than in the case of company with large staff and an extensive customer base, or vice versa. Originality/value: The resulting competency model can make the selection process more transparent for both recruiters and job candidates because of established standards concerning desirable key competencies for such positions in trading companies. At the same time, this tool can be an acceleration and suitable starting point for more extensive implementation of the modern competency-based approach for economics and business degrees at universities.

Geomarketing - Tool for Consumer Spending Estimation in the Czech Tourism & Hospitality Market

Radim Dušek,Petr Štumpf,Viktor Vojtko 사람과세계경영학회 2019 Global Business and Finance Review Vol.24 No.1

This paper deals with a source market size estimation tool that is based on a combination of geomarketing information and consumer spending datasets. We have decided to apply a proposed estimation method on three consumption expenditure groups that are related to the tourism and hospitality industry in the Czech Republic. The geographic and consumer spending data sets for the period 2011 - 2016 were drawn from publicly available sources. With the use of GIS software, this method allowed us to estimate and graphically display consumer spending on recreation and culture; restaurants and hotels; and transport in 2016 at the level of Czech districts, as well as the average annual growth rate during the period 2011 – 2016. This paper describes the Czech tourism and hospitality market from its size and growth point of view. It shows the trends in expenditures for hospitality and tourism services, explain the purchasing power in Czech regions and districts and predict the development for next few years. The results obtained by this low-cost method can be easily used by enterprises from the Czech Republic within domestic tourism, as well as by the foreign companies wanting to attract Czech visitors.

Spent fuel characterization analysis using various nuclear data libraries

Čalič Dušan,Kromar Marjan 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.9

Experience shows that the solution to waste management in any national programme is lengthy and burdened with uncertainties. There are several uncertainties that contribute to the costs associated with spent fuel management. In this work, we have analysed the impact of the current nuclear data on the isotopic composition of the spent fuel and consequently their influence on the main spent fuel observables such as decay heat, activity, neutron multiplication factor, and neutron and photon source terms. Nuclear libraries based on the most general nuclear data ENDF/B-VII.0, ENDF/B-VII.1, ENDF/B-VIII.0 and JEFF-3.3 are considered. A typical NPP Krsko fuel assembly is analysed using the Monte Carlo code Serpent 2. The analysis considers burnup of up to 60 GWd/tU and cooling times of up to 100 years. The comparison of results showed significant differences, which should be taken into account when selecting the library and evaluating the uncertainty in determining the characteristics of the spent fuel

의미적 장(semantic field)' 이론에 의한 한국어와 독일어 비교 연구

김두규 대한언어학회 2000 언어학 Vol.8 No.1

Kim, Du-Gyu. 2000. A Comparative Study of Korean and German According to the Semantic Field Theory. Linguistics 8-1, 191-206. The purpose of this paper is to compare some words in Korean and German, based on the semantic field, in order to show the differences of two languages and their reasons. The objects of comparison in semantic field are as follows: `go', 'die', 'come', 'words of family relation', 'academic grade' and 'words of mutual designations'. For example, the semantic field go' in German is composed of three divisions, whereas the semantic field go' in Korean is composed of only one section. This paper deals with the reason of this difference.(Woosuk University)

와동내에 조사된 열의 전도양상에 관한 연구

윤현두,허선,김재곤,이두철,백병주 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.3

The purpose if this study was to evaluate temperature change occurred in enamel, dentin and pulp due to the heat from cavity prepration with laser. We made three models had different cavity depth : cavity depth of model Awas 3.52mm, model B was 2.32mm, model C was 1.16mm. We irradiated cavity base with thermal capacity of 30J,100J,300J/㎤s during few seconds and studied the change of temperature in tooth during 10 seconds, and estimated change of thermal capacity by different irradiated site and exposure time. AT 300j/㎤s irradiation for 2 seconds, the temperature of irradiated surface was elevated fast according to irradiated thermal energy during I second, In proportion to continuous exposure time, temperature elevated slowly The surface temperature was 1370℃. After discontinue of thermal irradiation, the heat of irradiated surface was diffused in dentin and pulp and the greatest temperature was made, The greatest temperature was disappeared within 10 seconds The greatest temperature of the inner part of model brought about very severe change by different depth. Temperature in pulp was raised by the greater irradiated energy density and exposure time.

독일에서의 화행론의 수용과 변용

김두규 대한언어학회 1999 언어학 Vol.7 No.2

Kim, Du-Gyu. 1999. Acceptance and Transformation of Speech Act Theory in Germany. Linguistics 7-2, 289-302. Speech act theory was essentially discussed by linguistic philosophers such as J. L. Austin and J. R. Searle, who were subject to the influence of L. Wittgenstein. Therefore speech act theory has been .principally the subject of the linguistic philosophers. As the speech act theory was introduced in Germany since the late 1970's, it was accepted and transformed by some linguists such as F. Hundsnurscher, G. Hindelang and W. Franke. This paper explores the transformed forms of the orthodox speech act theory, namely 'the extended speech act theory' and 'the dialogical grammar'. (Woosuk University)