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호텔환경변화가 투숙객에 미치는 영향에 관한 연구 : 부산 · 경주지역 일본인 관광객을 중심으로
김우곤,윤우희 대한관광경영학회 2000 觀光硏究 Vol.15 No.1
Luxury Hotel room supply in Pusan has increased more than 25% in 1997 since Lotte Hotel and Grand Hotel opened The room supply increase is considered to be a major environmental change. After the environmental change, this study investigates whether the number of room nights of Japanese tourists in Kyongju and Pusan have increased. The findings of this study showed that more Japanese tourists who used to stay at Kyongju now would prefer to stay overnight in Pusan. Overall, additional demand has been generated after the additional hotel room supply in Pusan area. According to the survey results, Pusan needs to improve the development of tourism resources and a high priority should be given to Kyongju for the development of night entertainment and duty-free shops. This study implies that more cooperative marketing effort should be made to increase the number of Japanese tourists into both Pusan and Kyongju area since the market is regarded as a unified market rather than a separate market. The findings of this study would be used as a useful input for the development plan of attraction, the analysis of current problems of the tourism industry of both Pusan and Kyongju, the development policy of tourism industry.
Improved methodology for determining tensile elastic and plastic strain components of alloy 617
김우곤,박재영,김선진,김민환 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8
This paper presents an improved methodology for calculating tensile elastic and plastic strain components in total creep strain, whichare needed in the generation of the isochronous stress-strain curves (ISSC). The procedures for the RCC-MR code and Blackburn’smethods to determine the total strain are analyzed in detail, and a new method is proposed to determine the tensile elastic and plasticstrain components. To practically obtain the tensile elastic and plastic strain components for Alloy 617, high-temperature tensile testswere conducted at 800, 850, 900, and 950oC. Using the tested data, three methods of the RCC-MR code, Blackburn, and the newly proposedmethod were applied and compared. In the elastic regime, the three methods were identical in the tensile curves, but in the plasticregime, Blackburn’s method was higher in the stress-strain curves than the RCC-MR code. The difference gap for the two methods waslarger with an increase in the plastic strain. In addition, the proposed new method revealed almost midway values for the two methods. Itwas suggested that the proposed method is useful to determine tensile and plastic strain components.
Creep Characterization of Type 316LN and HT-9 Stainless Steels by the K-R Creep Damage Model
김우곤,김성호,류우석,Kim, U-Gon,Kim, Seong-Ho,Ryu, U-Seok 대한기계학회 2001 KSME International Journal Vol.15 No.11
The Kachanov and Rabotnov (K-R) creep damage model was interpreted and applied to type 316LN and HT-9 stainless steels. Seven creep constants of the model, A, B, $textsc{k}$, m, λ, ${\gamma}$, and q were determine d for type 316LN stainless steel. In order to quantify a damage parameter, the cavity was interruptedly traced during creep for measuring cavity area to be reflected into the damage equation. For type 316LN stainless steel, λ= $\varepsilon$R/$\varepsilon$* and λf=$\varepsilon$/$\varepsilon$R were 3.1 and increased with creep strain. The creep curve with λ=3.1 depleted well the experimental data to the full lifetime and its damage curve showed a good agreement when r=24. However for the HT-9 stainless steel, the values of λ and λf were different as λ=6.2 and λf=8.5, and their K-R creep curves did not agree with the experimental data. This mismatch in the HT-9 steel was due to the ductile fracture by softening of materials rather than the brittle fracture by cavity growth. The differences of the values in the above steels were attributed to creep ductilities at the secondary and the tertiary creep stages.