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정재연(Jae-Youn Jung),백일현(Il-Hyun Baek),조인성(Ihn-Sung Cho),송규근(Kyu-Keun Song),오석형(Seok-Hyung Oh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.9
Recently, restrictions of performance, environment and noise on the oil hydraulic system of the heavy construction equipment have been reinforced continuously, so in order to solve these problems, studies on compactness of the system, operation under high rotating speeds and pressure, electronic control, substitute oil, and noise reduction have progressed briskly. In these recent studies, the operation of the system under high pressure has been studied continuously; however, the realization of it is very difficult due to mechanical limitations. For the operation of the hydraulic pump under high pressure, design techniques, manufacturing techniques, and improvement of lubrication performance of the working oi I are required. In this study, in order to respond to this demand for high pressure, the stress distribution and optimum design factors under the Max pressure were discussed through stress analysis of the cylinder block of the hydraulic axial piston pump, which is one of the most important relative sliding regions.
정재연(Jae-Youn Jung),신현일(Hyun-Il Shin),백일현(Il-Hyun Beak),조인성(In-Sung Cho),송규근(Kyu-Keun Song),오석형(Souk-Hyung Oh),정용욱(Yong-Wook Jung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Rcently, noise and vibration by roller bearing brings trouble to pass in need to more speedy rotating and light weight, high durability in rotating system. For distinction clearly of appropriateness of roller bearing element, the effect of total system necessaries sure understanding under the motion condition. But, although roller bearing is used extensively, the related researches in this field are extremely limited. Therefore, attempts have been made to calculate film thickness, pressure distribution throughout the analysis of elastohydrodynamic lubrication, and contribute to high efficiency and performance improvement of bent-axis type piston pump throughout the close examination of lubrication characteristics between roller and inner race of roller bearing in this paper.
간문맥 혈전이 동반된 진행성 간세포암에서 간동맥내 항암제 주입요법
정재연 ( Jae Youn Cheong ),이기명 ( Kee Myung Lee ),조성원 ( Sung Won Cho ),원제환 ( Jae Han Won ),김재근 ( Jai Keun Kim ),왕희정 ( Hee Jung Wang ),함기백 ( Ki Baik Hahm ),김진홍 ( Jin Hong Kim ) 대한내과학회 2004 대한내과학회지 Vol.67 No.1
목적: 간문맥 혈전이 동반된 간세포암은 예후가 매우 불량한 것으로 알려져 있다. 경간동맥 화학색전술은 진행성 간세포암의 치료로 널리 행해지고 있으나 일부 환자에서는 치료 후 간부전이 문제시 된다. 본 연구는 간문맥 혈전이 동반된 진행성 간세포암에서 보존적 치료 및 전신적 항암 요법과 비교하여 간동맥내 5-fluorouracil (FU), cisplatin 주입요법의 치료 효과를 알아보고, 생존에 영향을 미치는 예후인자를 알아보고자 하였다. 방법: 199 Background: Advanced hepatocellular carcinoma (HCC) with portal vein thrombosis has a poor prognosis and has little hope for meaningful therapy. Transarterial chemoembolization has been performed as a treatment for advanced HCC, but some patients die from
정재연(Jae-Youn Jung),백일현(Il-Hyun Baek),오석형(Seok-Hyung Oh),김신(Shin Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The aerial working platform has three motion axes, that is, telescoping, elevation and slewing, which arc driven by electro-hydraulic actuators. Generally the operation of the aerial working platform is difficult because of nonlinear characteristics of hydraulic actuators and its complicated mechanical structures. Especially the telescopic boom operations involve stick-slip oscillations like slideways and the shape of stick-slip becomes more severe and saw-toothed.<br/> The purpose of this study is to derive the experimental model for the system of the telescopic boom in the stick-slip condition. From this theoretical approach, we obviously found stick-slip oscillations, when hydraulic telescopic booms taken large mass are driven at slow speeds between the two pads.<br/>
정재연 ( Jae Yeon Jung ),김수화 ( Soo Hwa Kim ),김영경 ( Young Kyung Kim ),안세연 ( Se Youn Ahn ),유은미 ( Eun Mi Yoo ),최부근 ( Boo Keun Choi ),황윤숙 ( Yoon Sook Hwang ),한수진 ( Su Jin Han ) 한국치위생학회 2016 한국치위생학회지 Vol.16 No.3
Objectives: The purpose of the study is to investigate the awareness toward use and service contents of long term care for the elderly. Methods: A self-reported questionnaire was completed by 296 adults from August 13 to October 20, 2014. The questionnaire consisted of general characteristics of the subjects, awareness toward long term care insurance for the elderly, awareness toward long term oral health care services, use of long term care service and use intention for the long term care insurance. Data were analyzed by SPSS 18.0 program. Results: Those who were aware of the long term care insurance accounted for 55.4 percent. Approximately 50 percent of the respondents recognized long term care service items, home visit care, home visit bathing, and home visit nursing. Most of the respondents had information of long term care services by way of mass media and direct contact. Only 13.4 percent of the respondents were aware of the oral health service in the long term care insurance. The subjects were aware of denture cleaning, oral cleaning and oral health education out of oral health service in order; and oral health services that needed to be offered were denture cleaning, oral health education and professional toothbrushing. They reported that dental hygienists were the most important manpower that offered the efficient oral health care services. They answered that professional manpower and financial support are required for oral health services. The positive thinking to long term care insurance accounted for 89.2 percent and 91.3 percent had use intention for oral health services. Conclusions: Many elderly people have mastication or dysphagic problems due to systemic diseases. Therefore, it is necessary to announce the long term care insurance and long term care services for the elderly people.
관상동맥 중재술을 받은 급성 심근경색증 환자에서 체질량 지수의 영향
정선영 ( Seon Young Jeong ),이정애 ( Jung Ae Rhee ),정명호 ( Myung Ho Jeong ),황선호 ( Seon Ho Hwang ),윤남식 ( Nam Sik Yoon ),홍서나 ( Seo Na Hong ),이상록 ( Sang Rok Lee ),김계훈 ( Kye Hun Kim ),문재연 ( Jae Youn Moon ),홍영준 ( 대한내과학회 2007 대한내과학회지 Vol.73 No.6
목적: 비만은 관상동맥 질환의 위험인자로 알려져 있으나, 급성 심근경색증 환자에서 비만이 미치는 영향이나 관상동맥 중재술 후 장기 예후에 대한 영향은 잘 알려져 있지 않다. 본 연구를 통해 급성 심근경색증 환자에서 비만이 미치는 영향과 관상동맥 중재술 후 장기 예후에 미치는 영향을 알아보고자 하였다. 방법: 2002년 2월 1일부터 2006년 6월 30일까지 전남대학교 심장센터에서 급성 심근경색증으로 진단되어 관상동맥 중재술을 시행한 309예(60.5±11.3세, 남:여=243:66)를 대상으로 하였다. 체질량 지수가 25 kg/m2미만인 194예의 환자를 I 군(61.7±11.1세, 남:여=151:43), 체질량 지수가 25 kg/m2 이상인 115예의 환자를 II 군(58.6±11.5세, 남:여=92:23)으로 하여 두 군 간의 임상적 특성이나 위험인자들을 비교하였고, 6개월간 추적 경과관찰 동안 발생한 주요 심장 사건을 분석하였다. 결과: I 군에서 II 군에 비하여 나이가 많았고(61.7±11.1세 vs. 58.6±11.5세, p=0.017), II 군에서 고혈압(59/115 vs. 75/194예, p=0.033)과 고지혈증(60/115 vs. 75/194예, p=0.024)의 빈도가 높았다. 고지혈증의 경우 II 군이 I 군에 비해 혈중 총 콜레스테롤(201.4±42.6 mg/dL vs. 184.3±39.9 mg/dL, p=0.001), 중성지방(147.1±96.2 mg/dL vs. 121.2±61.6 mg/dL, p=0.005), 저밀도 콜레스테롤(134.1±37.8 mg/dL vs. 120.3±35.1 mg/dL, p=0.002)이 높았으나, 고밀도 콜레스테롤(42.3±10.2 mg/dL vs. 44.5±12.1mg/dL, p=0.109)은 차이가 없었다. 관상동맥 조영술이나 중재술과 연관된 인자는 두 군에서 차이가 없었다. 178예(I 군 109예, II 군 69예)의 환자에서 6개월 추적 관상동맥 조영술이 시행되었다. 재협착은 I 군에서 14예(12.8%), II 군에서 18예(26.1%)가 발생하여 II 군이 I 군에 비해 재협착율이 유의하게 높았다(p=0.025). 결론: 비만을 동반한 급성 심근경색증 환자에서는 고지혈증과 고혈압이 동반되는 경우가 많았으며, 관상동맥 중재술 후 재협착이 유의하게 많이 발생함을 알 수 있었다. 따라서 비만에 대한 적극적인 치료가 심근경색증 환자에서 중재술 후 재협착 예방에 중요할 것으로 생각되었다. Background: Obesity is one of the major risk factors for coronary artery disease. However, the long-term clinical effects of obesity after percutaneus coronary intervention (PCI) in Korean patients with acute myocardial infarction (AMI) have not been sufficiently evaluated. Methods: A total of 309 patients (mean age 60.5±11.3 years, M:F=243:66) that underwent PCI with a diagnosis of AMI between February 2002 and June 2006. Thepatients were divided into two groups according to the body mass index (BMI): group I (n=194; BMI<25 kg/m2; mean age 61.7±11.1 years, M:F=151:43) and group II (n=115; BMI≥25 kg/m2, mean age 58.2±11.3 years, M:F=92:23). Clinical characteristics and risk factors, and major adverse cardiac events during a six-month follow-up were compared between patients in the two gropus. Results: The mean age of group I patients was older than that of group II patients (61.7±11.1 years vs. 58.6±11.5 years, p=0.017). The prevalence of hypertension was higher in group II patients (75/194, 38.7% vs.59/115, 51.3%, p=0.033) and hyperlipidemia was more prevalent in group II patients (75/194, 38.7% vs. 60/115, 52.2%, p=0.024). The levels of total cholesterol (184.3±39.9 mg/dL vs. 201.4±42.6 mg/dL, p=0.001), triglycerides (121.2±61.6 mg/dL vs. 147.1±96.2 mg/dL, p=0.005), low-density lipoprotein-cholesterol (120.3±35.1 mg/dL vs. 134.1±37.8 mg/dL, p=0.002) were lower in group I patients than in group II patients. The restenosis rate on a follow-up coronary angiogram was higher in group II patients (18/69, 26.1%) than in group I patients (14/109, 12.8%, p=0.025). Conclusions: Obesity is associated with hyperlipidemia and hypertension in patients with AMI. The restenosis rate after PCI was higher in obese AMI patients. (Korean J Med 73:603-610, 2007)
사판식 유압 피스톤 펌프의 슬리퍼 정압베어링 특성 연구
곽재련(Jae-ryon Kwak),김종기(Jong-Ki Kim),조인성(Ihn-sung Cho),오석형(Seok-Hyung Oh),송규근(Kyu-Keun Song),정재연(Jae-Youn Jung) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
In the high rotational speed and pressure state, the leakage flow rate of the axial piston pump is one of the serious problems and make great reasons to decrease the volume efficiency. In this study, I tried to clarify tribology characteristics for the hydrostatic slipper bearing in the swash plate type axial piston pump by means of theoritical analysis for the different bearing shape model. It was analyzed by Mathcad software and used equal conditions at 0˚ swash plate angle in each model. Finally, I want to know the function of the auxiliary land and the slot in the slipper compare to the each model. So, I tried to find the optimal operating conditions and slipper shape have a low power loss and a high performance.