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제어밸브와 부하에 접속된 유압관로계의 동특성 시뮬레이션
趙勝鎬,安建馨 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
In this distributed parameter modeling of fluid transmission line are considered and linear friction model, modified linear friction model, steady state correction model are compared for the user to select in software. The simulation results of lumped parameter model and distributed parameter model are compared to conform the fundamental differences between them. Experimental results for the closed line model are compared to the simulation results to assume the accuracy of model and programming.
趙勝鎬,安建馨 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1
This paper deals with the issue of tuajectory control of a hydraulic excavator using disturbance observer. In order to compensate external disturbances occuring from coupling between attachment, asymmetry of a single rod cylinder, and deadzone of main control valve, disturbance compensation control system with disturbance observer has been constructed for the boom and arm respectively. Simulation results were compared with experimental results to validate the computer simulation system of hydraulic excavator itself. Computer simulation shows that disturbance compensation control is effective for compensating system nonlinearity and improves positioning accuracy and trajectory tracking performance. Adding PI controller to this control system, error due to varying velocity in high-velocity condition has been decreased. Also with velocity feedback, system stability has been improved.
조경석,라형균,안명수,최창락,송진언 대한신경외과학회 1985 Journal of Korean neurosurgical society Vol.14 No.1
We reviewed the cases of 9 patients with vascular lesions in thalamus, 5 hemorrhage and 4 infarctions that were confirmed clinical and CT findings. Generally CT scan and clinical datas proved to be helpful to the diagnosis and prognosis to thalamic lesion. However, these findings are not exactly correlated to prognosis of patients. We can gain more informative factors to our patients for Multimodal evoked potential examination (MEP) to analysis. Especially in our cases, MEP findings proved to be the most effective results in the determinations of the prognosis. We review the literature and discuss the treatment and discuss the treatment and prognosis in thalamic lesion. Emphasis is placed on the current and optimal method of the evaluation of prognosis in thalamic lesions using MEP combined with the finding of CT scan and clinical status.
Changes in the Residual Chlorine Content of Fresh-cut Lettuce during Storage
Cho, Sun-Duk,Chang, Min-Sun,Lee, Yu-Si,Ha, Ji-Hyoung,Kim, Gun-Hee,Bae, Dong-Ho,Kim, Yong-Soo,Chung, Myung-Sub,Kim, Yong-Mu,Lee, Dong-Ho,Park, Sun-Hee,Ha, Sang-Do The Korean Society for Applied Biological Chemistr 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.3
Efficacies of the amounts and methods for chlorinated water to use in disinfection of lettuce were investigated. Concentrations of total and free chlorine in lettuce samples were measured using a colorimetric reaction with diethyl-p-phenylenediamine (DPD). For measurement of the total amount of residual chlorine remaining on samples of lettuce during storage, 100 mg/L DPD samples were used. The residual chlorine content decreased an initial amount of 14 mg/L and further decreased by 42.9% after three minutes, by 92.9% after ten minutes, and diminished to 4 mg/L after seven hours of storage. Measurements made while applying 200 mg/L chlorinated water showed a similar trend. The change in the amount of free available chlorine in the washing water was determined based on storage period and frequency. While washing, the amount of free available chlorine decreased proportionally with time.
김형태 ( Hyoung-tae Kim ),이승택 ( Seung-taek Lee ),강건우 ( Gun-u Gang ),조경재 ( Kyoung-jae Cho ),이재훈 ( Jae-hoon Lee ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
4차 산업으로 효율적인 진입을 위해 학교현장에서는 코딩교육을 하고 있다. PC앞에서 모니터에 의존하여 변화 없는 코딩 교육은 주입식 교육을 벗어나지 않을 뿐만 아니라 몰입도가 떨어지게 된다. 이를 해소 하고자 로봇을 만들고 프로그램 하여 성능평가를 하여 스스로 이해하고 집단 경기를 통해 재미와 학습을 효율적으로 코드를 익히기 위한 로봇 교구를 개발하고 실험을 통해 검증하고자 한다.
Sun Duk Cho,Min Sun Chang,Yu Si Lee,Ji Hyoung Ha,Gun Hee Kim,Dong Ho Bae,Yong Soo Kim,Myung Sub Chung,Yong Mu Kim,Dong Ho Lee,Sun Hee Park,Sang Do Ha 한국응용생명화학회 2010 Journal of Applied Biological Chemistry (J. Appl. Vol.53 No.3
Efficacies of the amounts and methods for chlorinated water to use in disinfection of lettuce were investigated. Concentrations of total and free chlorine in lettuce samples were measured using a colorimetric reaction with diethyl-p-phenylenediamine (DPD).
이동건(Dong Gun Lee),윤정민(Jung Min Yoon),조재형(Jae Hyoung Cho),최수미(Su Mi Choi),박윤희(Yoon Hee Park),김유진(Yoo Jin Kim),이석(Seok Lee),최정현(Jung Hyun Choi),이종욱(Jong Wook Lee),신완식(Wan Shik Shin),김춘추(Chun Choo Kim) 대한내과학회 2001 대한내과학회지 Vol.60 No.2
N/A Background : Infections are still a frequent cause of morbidity and mortality in patients with hematologic malignancies. Antimicrobial prophylaxis in neutropenic patients has been practised for several decades. But, recently the rates of occurrence for pathogens have significantly changed (from predominance of gram-negative to gram-positive species) under selective pressure of antimicrobial prophylaxis, and novel resistance mechanisms have emerged. We investigated this study to assess the effectiveness of selective bowel decontamination for preventing infections in granulocytopenic patients who are receiving chemotherapy for acute myelogenous leukemia. Methods : In a prospective, randomized trial, we evaluated the efficacy of oral ciprofloxacin (250 mg p.o. twice a day), roxithromycin (150 mg p.o. twice a day), fluconazole (50 mg p.o.) in 95 adult patients with acute myelogenous leukemia who undergone intensive chemotherapy. Prophylaxis was begun within 72 hours of initiation of the chemotherapy and continued until the onset of fever, signs or symptoms of infection, serious adverse effect, or recovery of the leukocyte count to ≥ 1,000/mm3. Results : 46 decontamination regimen treated patients and 49 control patients were assessable for efficacy. No difference was noted between the two groups in occurrence of fever during neutropenia, time to onset of first fever, sites of infection, duration of using systemic antimicrobials, overall infection rates, infection-related mortality, or hospitalization day. Decontamination regimen reduced the gram-negative infections, but increased the gram-positive infections. Among those who received decontamination regimen, the incidence of resistance to ciprofloxacin was 100% for gram-negative species. And resistance to erythromycin for gram-positive species, irrespective of decontamination, was very much high (90-100%). Conclusion : The approach of selective decontamination has not led to fewer febrile episodes or to a lower mortality in neutropenia after chemotherapy for acute myelogenous leukemia. It should be considered that we had better not prescribe decontamination regimen because of increment of infection due to gram-positive species and high resistance rate to fluoroquinolone and macrolide. Additional trials are needed to establish the efficacy of decontamination for other malignancies, aplastic anemia, or bone marrow transplantation.(Korean J Med 60:167-174, 2001)