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.

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.

CFD 모형을 이용한 홍수조절지 여수로의 흐름해석

이호진,안상도,전계원,손용구,Lee. Ho-Jin,An. Sang-Do,Jun. Kye-Won,Son. Yong-Koo 한국방재학회 2007 한국방재학회논문집 Vol.7 No.4

본 연구에서는 군남 홍수조절지 여수로의 흐름을 FLOW-3D 모형을 이용하여 모의하였다. 기본계획안에 따라, 월류웨어의 방류능력과 접근수로의 안정성을 검토한 결과 여수로 규모가 적절하지 못하고, 접근수로 내의 흐름은 불안정한 것으로 나타났다. 그래서, 문제점올 해결하기 위한 개선안을 마련하였다. 개선안에 따라 여수로의 흐름을 모의하고, 월류웨어의 방류능력과 접근수로의 안정성을 검토하였다. 그 결과 개선된 여수로의 규모는 적정한 것으로 나타났고, 접근수로의 안정성은 향상되는 것으로 나타났다. In this study, the flow in the spillway of Gun-nam flood control reservoir were simulated by using FLOW-3D model. The discharge in the overflow weir and flow stability in approach channel were investigated with the original design plan. The results show that the scale of spillway is unsuitable and the flow in approach channel is unstable. To solve this problem, therefore, the alternative design plan were formulated. The flow in the spillway were simulated with the alternative design plan. The results show that the scale of spillway is suitable and the flow in approach channel is stable.

조합기고 - 생활 속의 법률 합의의 효력

이호진,Lee, Ho-Jin 대한기계설비건설협회 2017 기계설비 Vol.320 No.-

유연한 부속물을 가진 우주선의 적응제어

이호진,이금원,Lee, Ho-Jin,Lee, Keum-Won 한국융합신호처리학회 2008 융합신호처리학회 논문지 (JISPS) Vol.9 No.2

In this paper, a simplified type of adaptive controller using Nussbaum gain for the control of the spacecrapt with elastic appendages is suggested. This method doesn't need the information of the high frequency components in transfer function. While the pitch angle tracks the desired value by this method, the elastic modes are also stabilized. Only pitch angle and the pitch rate are used for the design of the output feedback controller. Especially all system parameters and the high frequency gain are assumed to be unknown. For design simplicity, a controller is designed by using only the linear part, and it's shown to satisfy the nonlinear system by the simulation with basic explanations. By using the Lyapunov function, the stability of the suggested algorithm is demonstrated, and also the effectiveness of the suggested algorithm is verified by showing the computer simulation results. 본 논문에서는 유연모드 부속물을 갖는 우주선의 제어를 위해서 누스범 이득을 갖는 간단한 형태의 적응제어기를 제안한다. 이 방법은 전달함수에서 고주파 이득의 정보가 필요하지 않는다. 본 논문의 방법을 사용하여 피치각도가 목표치를 추종하는 중에, 아울러 유연모드의 안정화도 이룬다. 피치각과 피치각속도 성분만 사용하여 출력궤환제어기를 설계한다. 특히 모든 시스템 파라미터 및 고주파성분은 미지로 한다. 설계의 간편성을 위해서 선형함수만을 사용하여 설계한 제어기가 전체 비선형시스템을 만족함을 시뮬레이션을 통하여 보이고, 그 근거도 설명한다. Lyapunov 함수를 구성하여 제안한 방법의 안정성을 증명하고, MATLAB을 이용한 컴퓨터 시뮬레이션 결과를 제시하여 제안한 방법의 유용성을 증명한다.

서보보상기를 사용한 견실 출력귀환제어

이호진,이금원,Lee, Ho-Jin,Lee, Keum-Won 한국융합신호처리학회 2007 융합신호처리학회 논문지 (JISPS) Vol.8 No.3

본 논문에서는 비선형시스템의 제어대상의 하나로 사용되고 있는 Chua회로를 대상으로 견실 출력귀환제어를 실현한다. 특히 비선형인 경우는 선형의 경우와 틀린 접근방법을 사용하여야 한다. 우선 기준신호발생기인 exosystem을 정의하고 출력추종오차식으로부터 오차방정식을 유도하고, 적분기 형태의 서보보상기를 사용하여 수정된 슬라이딩면을 설계한다. 수정된 슬라이딩면과 서보보상기에 사용되는 파라미터들은 슬라이딩면 및 서보보상기가 안정하도록 관련다항식이 Hurwitz조건을 만족하도록 정한다. 특히 모든 파라미터들이 미지여서, 오차신호들이 귀환으로부터 얻을 수 없기 때문에, 고이득 관측기를 설계하고, 이 추정값을 사용하여 안정화제어기를 얻는다. 시뮬레이션결과를 제시함으로서 알고리즘이 유용함을 증명한다. This paper deals with the robust nonlinear controller design using output feedback for a Chua circuit which is one of the well-known nonlinear models. First, an exosystem for reference signal tracking is defined, and error dynamic equations are derived from the differentiation of the output tracking error equation. The normal sliding surface is modified using the integral type servo compensator. The parameters in the equations of the modified sliding surface and servo compensator are determined by using the Hurwitz condition of stability. Especially the error signals can't be obtained directly from the output because all parameters are assumed unknown. So instead, a high gain observer is designed. From this estimated error signals, a stabilizing controller is designed. Simulation is done for demonstrating the effectiveness of the suggested algorithm.

자기공명영상에서 나타난 만성 족근관절 외측 불안정성 동반 병변

이호진,주인탁,최광천,Lee, Ho-Jin,Chu, In-Tak,Choi, Kwang-Cheon 대한족부족관절학회 2009 대한족부족관절학회지 Vol.13 No.1

Purpose: This retrospective study was designed to determine the type and frequency of associated lesions in patients with chronic lateral ankle instability who had modified Brostrom lateral ankle ligament reconstruction. Materials and Methods: Between 2004 and 2007, 60 cases of 60 patients were enrolled in this study. A retrospective review of the magnetic resonance images of the affected ankle was conducted by two orthopedic surgeons who did not get any information about intraoperative findings and the lesions were admitted when two doctors were coincident. Results: The overall incidence of associated lesions found in this study was about 83%. Peroneal tenosynovitis was the highest frequency (32%), followed by osteochondral lesion of talus (28%), anterolateral impingement (15%), Os subfibula (13%), Os trigonum (12%), ankle synovitis (12%), anterior tibiofibular ligament tear (15%), anterior bony spur (7%). Another findings were loose bodies (5%), flexor tendon tenosynovitis (5%), medial osteophyte (3%). Conclusion: Identifying these associated lesions will be helpful in treating chronic lateral ankle instability especially when the surgeon have a plan to operate the instability. We suggest that the better results can be obtained when the associated lesions are corrected simultaneously.

Lindholm 방법을 이용한 진구성 아킬레스 건 파열의 치료

이호진,주인탁,최성필,Lee, Ho-Jin,Chu, In-Tak,Choi, Seong-Pil 대한족부족관절학회 2009 대한족부족관절학회지 Vol.13 No.1

Purpose: This retrospective study was designed to evaluate the treatment results of chronic Achilles tendon rupture by Lindholm method. Materials and Methods: Between 2002 and 2006, we performed the reconstruction of the Achilles tendon by using of the gatrocnemius-sloeus fascia known as Lindholm method. Ten cases of ten patients were enrolled in this study (8 men and 2 women). The mean age of the patients at the time of operation was 49 years (range, 32${\sim}$66 years). The mean follow-up duration was 15.2 months (range, 12${\sim}$19 months). The retrospective review of the clinical history, physical examination, the American Orthopedic Foot and Ankle Society (AOFAS) score were conducted. Results: The mean AOFAS score before surgery was 74.10${\pm}$2.56 and that of the latest follow-up was 90.60${\pm}$5.72. The excellent results were six and good results were four patients. Eight patients were normal triceps power and the others were good. The average of heel to floor distance was 4.5 mm less in the operated legs than the contralateral ones in each patient, but there was no significant difference (p>0.05). The average of calf muscle circumference in the mid-leg was 7.5 mm less in the operated legs than the contralateral ones and there was significant difference (p<0.05). The active range of motion of the ankles, mean plantarflexion was 40 degrees and dorsiflexion was 16.8 degrees in operated side. The contralateral side was 43 degrees in plantarflexion and 19 degrees in dorsiflexion. No case showed rerupture of the reconstructed Achilles tendon. One patient had the superficial wound infection which was treated successfully by antibiotic therapy. Conclusion: It was suggested that the overall results of Lindholm method for the chronic Achilles tendon rupture indicated satisfactory outcomes.

한국의 건축가 - 김정수(2)

이호진,Lee, Ho-Jin 대한건축사협회 1995 建築士 Vol.1995 No.7

조합기고 - 생활 속의 법률 권리금

이호진,Lee, Ho-Jin 대한기계설비건설협회 2017 기계설비 Vol.321 No.-