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스페인 산티아고 순례길 도보여행자의 관광동기와 여행행태 연구
고진현,구원일 관광경영학회 2019 관광경영연구 Vol.91 No.-
The purpose of this study is to investigate the tourism motivations and make clusters and to find out the characteristics of walking tours for 368 travelers to the pilgrimage way of St. James in Spain by on-off line survey. The first factors were extracted the 'self-meditation' factor, followed by 'self-refreshment', 'local experience' and 'curiosity' factors. The final factor was the ‘religious’ factor with the lowest average. The cluster analysis was classified into three groups: 'active walker', 'neutral walker' and 'passive walker'. The 'active walker' cluster had catholics in their 50s and 60s aged spent their journey with their family partners. The 'neutral walker' had a high rate of female unmarried responses under middle aged and non religious, walking alone mostly. The 'passive walker' cluster had intended to focus themselves on walking alone for religious reason. Based on the results the walking travelers pursue their internal value, domestic walking tours should be able to attract visitors seeking internal values by reinforcing themes related with local landscape and external programs.
국산 플럭스 코어드 와이어 용접에서 입열량이 용접부의 미세조직과 인성에 미치는 영향
고진현,국정한 대한용접접합학회 1993 대한용접·접합학회지 Vol.11 No.4
In the present study, the microstructure and Charpy V notch toughness of multipass $CO_2$ FCA weldment in three different heat inputs(1-3KJ/mm)were investigated. The weldments using two different domestic FCAW wires(AWS E71T-1 and E71T-5 equivalent) in C-Mn steel were chemically analysed. The following conclusions can be inferred. 1. T-1 wire Showed a stable arc transfer, less spatter and harsh, a better bead spreading and easy slag removal, whereas T-5 wire suffered from the arc stability, which tended to increase spatter and produce a more convex bead. 2.The microsturctures of the top beads of the weldments in three different heat inputs consisted of coarse-grained boundary ferrite and Widmanstatten ferrite side plate with increasing heat inputs. The modest fraction of acicular ferrite in the two wire weldments was observed in the 2KJ/mm heat input. 3.The fine-grained reheated zones of both welds consisted of a duplex microstructure of polygonal ferrite and second phases. 4. The basic flux weldment of T-5wires showed a higher Charpy impact property than that of T-1 wires because of a higher fraction of acicular ferrite in the weld microstructure.
800MHz 대역 고격리 이중급전 ICS 중계기 안테나
고진현,김건균,이승엽,이종익,Ko, Jin-Hyun,Kim, Gun-Kyun,Rhee, Seung-Yeop,Lee, Jong-Ig 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.5
무선통신 시스템에서 ICS 중계기는 Donor와 Service 사이의 거리를 많이 이격시켜야 높은 격리도를 확보할 수 있는 단점을 가지고 있다. 본 논문에서는 음영지역을 해소하여 통화권 영역을 확대하기 위해 높은 격리특성을 갖는 ICS(Interference Cancellation System)중계기 일체형 안테나를 설계하고 제작 및 측정을 통하여 성능을 평가하였다. 대역폭과 이득은 주방사 패치 및 기생 패치의 크기, 스터브 길이 등을 조정하여 구현하였다. 제작된 안테나는 CDMA 이동통신 주파수인 824~894 MHz 대역에서 이득은 3 dBi 이상, 격리도는 -56 dB 이하의 양호한 특성을 나타내었다. Even if ICS(Interference Cancellation System) repeater is used in wireless communication system, it has the disadvantage that it must have enough distance between Donor and Service antenna to be isolated. In this paper, new ICS repeater integrated antenna with high insolation characteristics is designed. The proposed antenna is fabricated for 800MHz and measured. Bandwidth and gain are optimized by changing the stub lengths near main patch and power divider, and also by changing the size of parasitic patch. The fabricated antenna has a return loss less than -13 dB, a gain over 3 dBi, and an isolation between the donor and the server antennas less than -56 dB from 824~894 MHz for CDMA mobile communication. Therefore, the proposed antenna structure can be applied to eliminate the shadow area and to expand the coverage area for any other wireless communication bands.
핵연료 피복관용 지르칼로이-4의 미세조직과 기계적 특성에 미치는 $\beta$-열처리의 영향
고진현,오영근,김광수,Koh, Jin-Hyun,Oh, Young-Kun,Kim, Gwang-Soo 한국재료학회 1999 한국재료학회지 Vol.9 No.6
The effect of $\beta$-heat treatment on th microstructure, mechanical properties and texture in the nuclear fuel cladding of Zircaloy-4 tubes was chosen at 1000, 1100 and 120$0^{\circ}C$, and the tubes were heat-treated by a high frequency vacuum induction furnace. Morphology of the second phase particles and $\alpha$-grain of as-received tubes were markedly changed by heat treatment. The average sizes of second phase particles of as-received and $\beta$-heat treated tubes were 0.1$\mu\textrm{m}$ and 0.076$\mu\textrm{m}$, respectively. However, the average sizes of second phase particles were not much changed in the $\beta$-heated temperatures. With increasing heat treatment temperatures, the 0.2% yield strength and the hoop strength were decreased because of changes in preferred orientation as will as $\alpha$-plate width. Heat treated Zircaloy-4 tubes exhibited texture changes but the preferred orientation of grains still remained.
Zircaloy-4의 플라즈마 아크용접에서 용접변수가 비이드형상에 미치는 영향
고진현,김수성,이영호 대한용접접합학회 1997 대한용접·접합학회지 Vol.15 No.6
A study was undertaken to determine the influence of welding variables such as shielding and plasma gases, torch standoff, travel speed and heat input, etc. on the quality of plasma arc welds in Zircaloy-4 sheet, 2mm thick. Effect of shielding gases and their flow rates on the mechanical properties of Zircaloy-4 welds by plasma arc welding were determined in terms of tensile, bardness and bend tests. The microstructure and fracture surface of Zircaloy-4 welds were investigated by optical and scanning electron microscopies. In addition, the causes of porosity and undercut in plasma arc welds of Zircaloy-4 were also investigated. Zircaloy-4 weld bead width and depth by helium shielding gas showed a wider and deeper than those by argon. It was found that Zircaloy-4 welds with shielding gas of helium did dxhibit a little smoother and uniform weld beads than those with shielding gas of argon. It was also found that the optimum gas flow rates for Zircaloy-4 welding were 0.45l/min for plasma gas with Ar and 4.5 - 6 l/min for shielding gas with He. In addition, there was no big difference in the microstructure and fracture surface of the weld metals made by either Ar shielding gas or He shielding gas.
베릴륨 용가재를 사용한 핵연료피복재 지르칼로이-4 브레이징에 대한 연구
고진현,김형수 대한용접접합학회 1993 대한용접·접합학회지 Vol.11 No.4
An attempt was made to investigate the effect of brazing time on microstructure, microhardness, and corrosion of Zircaloy -4as well as the beryllium diffusion into its sheet. The sheets were coated with beryllium and brazed at $1020^{\circ}C$ for 20-40 minutes in $2{\times}10^{-5}$ torr vacuum atmosphere. 1. Microstructurally the brazed zone was largely divided into three regions: a region of continuous or partially formed of eutectic liquid films along grain boundaries; a region of precipitation in both grains and grain boundaries; a region of elongated wide structure of .alpha.-laths, which was not affected by beryllium. 2. Due to the precipitates, the beryllium-migrated region was hardened and the width of the hardened region increased with increasing brazing time. 3. Beryllium brazed Zircaloy -4 sheets showed a higher corrosion rate than those of as-received and heat-treated at a brazing temperature. 4. Diffusion coefficient of beryllium into Zircaloy -4 at $1020^{\circ}C$ for 30 minutes was $7.67{\times}10^{-7}cm^2/sec.$ It seemed that Be penetrated Zircaloy -4 by forming eutectic liquid films along grain boundaries in the proximity of Be/Zr interface and it, thereafter, diffused into Zircaloy mainly by interstitial solid solution.