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벼 품종의 콤바인 수확과 건조방법에 따른 미입질의 변화
이호진,서종호,이은웅,Lee, Ho-Jin,Seo, Jong-Ho,Lee, Un-Woong 한국작물학회 1990 한국작물학회지 Vol.35 No.3
최근 미곡의 수확과 건조작업서 기계화와 동력화가 빠른 속도로 진행되고 있다. 벼 품종 추청과 밀양 2003를 재래식 낫과 콤바인으로 수확하고 천일건조, 개량곳간식, 인공화력식으로 건조하고 농기계 사용에 따른 곡물의 수확손실, 작업속도, 미립의 품질에 미치는 영향을 평가하였다. 1. 수확과정에서 낙립에 의한 포장손실은 콤바인을 사용하더라도 인력수확이나 차이 없었고 탈곡손실만은 콤바인 수확이 1.2% 가량 증가하였다. 소요작업시간은 콤바인 탈곡까지 완료하고도 3.5배 빨랐다. 품종간에 수확손실은 차이가 심하였는데 통일계인 밀양 2003가 일반계인 추정보다 약 2배의 손실량이 발생하였다. 2. 미곡의 건조방법별 건조속도는 수분함량 14%로 감소시키는데 인력수확후 천일건조는 10일이 소요되었으나 콤바인 수확후 천일건조는 5-9일이 걸렸고 개량곳간식은 2-3일, 화력건조는 15시간이 소요되었을 뿐이었고 계속 둘 경우 과건될 위험이 컸다. 3. 수확과 건조방법이 미립질에 미치는 영향은 완전미비율에서 화력건조가 가장 낮아 천일건조 보다 약 4% 저하하였으며 품종간에는 밀양 2003가 추청보다 낮은 경향이었다. 이것은 화력건조에서 동할미와 쇄미의 비율이 증가하였기 때문이었고 수확방법에 따른 미질의 영향은 콤바인 수확이 밀양 2003의 불완전미비율을 증가시켰으나 단립형인 추청은 영향을 받지 않았다.
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해석 해의 온도곡선을 이용한 템퍼비이드 용접공정 평가기술
이호진,이봉상,박광수,변진귀,정인철,Lee, Ho-Jin,Lee, Bong-Sang,Park, Kwang-Soo,Byeon, Jin-Gwi,Jung, In-Chul 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.5
Brittle microstructure created in a heat affected zone (HAZ) during the welding of low alloy steel can be eliminated by post-weld heat treatment (PWHT). If the PWHT is not possible during a repair welding, the controlled bead depositions of multi-pass welding should be applied to obtain tempering effect on the HAZ without PWHT. In order to anticipate and control the tempering effect during the temper bead welding, the definition of temperature curve obtained from the analytical solution was suggested in this research. Because the analytical solution for heat flow is expressed as a mathematical equation of weld parameters, it may be effective in anticipating the effect of each weld parameter on the tempering in HAZ during the successive bead depositions. The reheating effect by the successive bead layer on the brittle coarse grained HAZ formed by earlier bead deposition was estimated by comparing the overlapped distance between the temperature curves in the HAZ. Three layered weld specimens of SA508 base metal with A52 filler were prepared by controlling heat input ratio between layers. The tempering effect anticipated by using the overlapped distance between the temperature curves was verified by measuring the micro-hardness distribution in the HAZ of prepared specimens. The temperature curve obtained from analytical solution was expected as a good tool to find optimal temper bead welding conditions.
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감시시험 결과를 이용한 국내원전 압력용기 재료의 Chemistry Factor 및 RT<sub>PTS</sub> 평가여유도 분석
이호진,윤지현,최권재,이봉상,Lee, Ho-Jin,Yoon, Ji-Hyun,Choi, Kwon-Jae,Lee, Bong-Sang 한국압력기기공학회 2011 한국압력기기공학회 논문집 Vol.7 No.3
The chemistry factor and RTPTS margin for domestic reactor pressure vessel materials were analyzed by using the surveillance data which have been obtained from 8 nuclear power plants in Korea. The surveillance data have been used to assess the integrity of the pressure vessel under the pressurized thermal shock (PTS) event. The chemistry factor, which is determined by the Cu and Ni contents of vessel materials, is considered a proper tool to assess the $RT_{PTS}$. The chemistry factors, which were obtained from the surveillance data of domestic reactor pressure vessels, were investigated and compared with those of Regulatory Guide 1.99 in this study. Regressions for ${\Delta}RT_{NDT}$ were performed to expect the chemistry factor as a function of Cu and Ni, and to estimate $RT_{PTS}$ margin. The margin analysis was performed by comparing the regression graphs and standard deviations with those of Regulatory Guide 1.99. The standard deviations calculated by using the domestic surveillance data for base metal and welds are almost same as the standard deviations which are suggested on Regulatory Guide 1.99, Rev.2.
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이호진,송광엽,윤태호,Lee, Ho-Jin,Song, Kwang-Yeob,Yoon, Tae-Ho 대한치과보철학회 2006 대한치과보철학회지 Vol.44 No.5
Statement of problem: Modification of titanium implant surface has potential to ensure clinically favorable performance that several surface modification technologies have been introduced. Among the methods. anodizing method and sol-gel hydroxyapatite coating method have gained much interest due to its roughness and chemical composition of the coating layer, but more of its biocompatibility result is required. Purpose : The purpose of this study was to compare bone-implant interface shear strength of four different surface treated implants as time elapsed. Resonance frequency analysis(RFA) and removal torque measurement methods were employed to measure implant stability at one week and six week after implantation. Material and method: A total of 80 screw-shaped implant [20 machined, 20 resorbable media blasted(RBM), 20 anodized, and 20 anodized+hydroxyapatite sol-gel coated] were prepared, and one of each group was implanted in the tibia of a New Zealand white rabbit that total 20 of them were used. In order to test the implant stability and implant-tissue interface contact changing in the bone bed, each 10 rabbit were sacrificed 1 week and 6 week later while resonance frequency and removal torque were measured. One-way analysis of variance and the Tukey test were used for statistical analysis. Results : The results were as follows. 1. There was no statistically significant difference of implant stability quotients(ISQ) value in RFA between individual groups after 1 week of implantation and 6 weeks(p>0.05). But, there was statistically significant increase of ISQ value in 6 weeks group compared to 1 week group(p<0.05). 2. There was no statistically significant difference in removal torque analysis between individual groups after 1 week of implantation and 6 weeks(p>0.05). but there was statistically significant increase in all 4 groups after 6 weeks compared to 1 week later(p<0.05). 3. There was no statistically significant difference in removal torque analysis between anodized group and HA coating after anodic oxidation 6 weeks later(p>0.05), but significant difference was appeared in both groups compared to RBM group and smooth-machined group(p<0.05). Conclusions : It can be suggested that changes in surface characteristics affect bone reactions. Anodized and anodized+hydroxyapatite sol-gel coating showed significantly improved bone tissue response to implants, but further study on the effect of hydroxyapatite dissolution is needed.
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이호진,윤경식,이균경,Lee, Ho Jin,Yoon, Kyung Sik,Lee, Kyun Kyung 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.1
Source localization has developed in various fields of signal processing including radar, sonar, and wireless communication, etc. Source localization can be found by estimating the time difference of arrival between the each of sensors. Several methods like the NLS(Nonlinear Least Square) cost function have been proposed in order to improve the performance of time delay estimation. In this paper, we propose a clustering method using the four sensors with the same aperture as previous methods of using the three sensors. Clustering method can be improved the source localization performance by grouping similar estimated values. The performance of source localization using clustering method is evaluated by Monte Carlo simulation.
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이호진,김준호,임준성,강덕근,Lee, Ho-Jin,Kim, J.H.,Lim, J.S.,Kang, D.G. 통신위성우주산업연구회 2000 Joint Conference on Satellite Communications Vol.2000 No.-
국내에서도 위성전파 자을 효율적으로 그리고 경제적으로 활용하고 또한 구구내 위성통신망을 외부의 간섭으로부터 보호하기 위하여 자체적인 위성 전파 감시시스템 개발을 착수하였다. 이 시스템 개발계획은 1998년부터 시작되었으며, 금년 6월부터 개발에 착수하게 되었다. 2년간의 개발을 거쳐 서울 근교의 이천에 감시센터가 건립될 예정이다. 정보통신부와 중앙전파관리소가 주체가 되어 국내에 확보된 기술을 활용하여 국내 독자적으로 개발에 착수하였으며 현재 시스템 설계가 완료된 상태에 있다. 본 논문에서는 시스템에 대한 전반적인 개요와 구조설계에 대해서 소개를 한다. 또한 시스템의 기능과 성능, 용량에 대해서 분석하며 각각의 주요 기능에 대해 언급하였다. Motivated by the satellite radio monitoring systems built and operated by some countries, MIC of Korea has launched the development of its own satellite monitoring system to ensure efficient and economical use of radio frequency spectrum as well as to protect domestic satellite communications. The system development contract was awarded in June this year and is scheduled to be activated after two year's implementation at the site south to Seoul. Korean expertise of domestic industry led by MIC has been hooked up together and has undertaken the system architecture design. In this paper, overall introduction of the system and its architectural design aspects will be presented. An exploration of the system functions including harmful interference searching is presented to such an extent as to provide the overall picture of the system in term of its architecture and functional capabilities.
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