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Fundamental Behavior Analysis of SCM440 Steel on Friction and Wear
Jae-Young Byun(변재영),Chang-Ju Lee(이창주),Jun-Soo Jang(장준수),Won-Sik Choi(최원식) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.1
Due to the increased use of power caused by industrial development, the importance of improving wear and friction in the contact region has emerged. Except for some parts, such as brakes or clutches and friction, seals and precision mechanical parts (e.g., pistons, bearings, valves, and cams) are important engine components that require low friction characteristics. In this study, the experimental method used to determine the friction characteristics was based on the type of rpm with the pin-on-disc test device, the element analysis program ANSYS was used to analyze the surfaces of the two metals rubbing together, and physical formation FEM models were used to study the properties and wear. The friction coefficient of variation was unsafe, but at the start of wear, it converged to a stable friction coefficient that increased after a certain slip away.
변재영 ( Jae Young Byun ),오케추쿠나에메카니콜라스 ( Okechukwu Nnaemeka Nicholas ),이은숙 ( Eun Suk Lee ),양지웅 ( Ji Ung Wang ),김국현 ( Kuk Hyeon Kim ),김근우 ( Geun Woo Kim ),박진규 ( Jin Gyu Park ),최원식 ( Won Sik Choi ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1
기후가 급격히 변함에 따라 농작물의 생산환경이 급변하고 있으며, 폭설, 폭우, 혹서 등의 환경에 대해 독립된 환경을 조성하고자 스마트팜이 화두가 되고 있다. 더불어 인구고령화와 노동력 부족, 생산성 효율 등의 문제로 식물공장을 통한 무인재배 환경을 만들기 위해 다양한 시도가 이루어지고 있다. 국내에서는 비닐하우스와 유리온실이 주로 사용되고 있으며 무인 환경을 조성하기 위해서 비닐하우스는 겨울철 난방문제와 유리온실의 여름철 고온에 대한 냉방 문제를 해결해야 한다. 작물 및 지역 조건에 맞는 냉난방 온도를 효율적으로 제어할 수 있는 시스템 구축이 필요하다. 이에 본 논문에서는 온·습도 변화에 민감한 표고버섯을 이용하였으며, 품질안정화와 노동력 저감, 수확량 증가를 위해 수직형 체인 컨베이어 형식의 재배사와 생육 관수 및 습도, 조명, 이산화탄소를 무인으로 제어할 수 있는 스마트팜 환경제어 시스템을 제안한다. 재배사에 부착된 각종 센서를 통해 실시간으로 수분 공급 및 환기를 통해 버섯의 생육하는 데 최적화된 상태를 제공한다. 이를 통해 기존에 시행되고 있는 재래식 방식의 버섯재배사의 문제점인 상하의 상태차이로 인한 품질이 균일하지 못한 점을 해소하고 컨베이어 형식으로 사용자의 노동력 및 시간관리에 도움을 줄 수 있다. 또한 동일한 공간 활용 시 기존의 재배사 보다 높은 생산량을 확보 할 수 있다.
전기철도 전력 원방 감시제어 시스템 최적 구성방안 연구
변재영(Byun Jae-Young),창상훈(Chang Sang-Hoon),김왕곤(Kim wang-Gon) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper is countermeasure against the problem point it will be able to occur with infiltration of the hardware and software. And, we proposed the optimum integrated of system construction plan for the SCADA system fuction set and a system design.
척추 전방전위증의 전산화 단층촬영 소견 : 협부형과 퇴행형의 비교
이종덕,변재영,Lee, Jong-Deok,Byun, Jae-Young 대한침구의학회 2000 대한침구의학회지 Vol.17 No.4
Objectives : To evaluate the findings useful for differential diagnosis and associated abnormaiities of isthmic spondylolisthesis and degenerative spondylolisthesis on CT. Materials and methods : We reviewed retrospectively the CT images of 65 patients who were diagnosed spondylolisthesis during 3 years period. Our technique was 5mm slices at 5mm intervals with gantry angle to parallel the interspaces. Also reformatted sagittal views were taken. 41 patients were isthmic spondylolisthesis and 24 patients were degenerative spondylolisthesis. Resuits : Isthmic spondylolisthesis. 1. Isthmic type was more common at L5-S1. 2. The degree of anterior displacement was grade I and II. 3. The plane of defect was more horizontal than the usual facet joint. 4. The defect had an irregular shape. 5. Medial aspect of bone just anterior to defect had a small round prominence. 6. Anteroposterior elongation of the spinal canal was common. 7. Pseudobulging disk was common. 8. The most common associated abnormality was a HNP at the upper level of the defect. Degenerative spondylolisthesis. 1. Degenerative type was more common at L4-5. 2. The degree of anterior disptacement was grade I and II. 3. The Plane of facet joint was oriented obliquely instead of horizontally. 4. The posterior facet(inferior facet of superior vertebra) was anteriorly displaced. 5. Bony spur of the posterior portion of anterior facet was seen. 6. The facet joints often contain gas(vaccum phenomenum). 7. The most common associated abnormality was a HNP at the level of the displacement. Conclusions : CT is a highly accurate and most sensitive technique for recognition, differential diagnosis of isthmic and degenerative types and the detection of associated abnormalities.
천경아,변재영,이재문,하현권,김현,박영하,김일순,김종우,박용휘,신경섭,Chun, Kyung-Ah,Byun, Jae-Young,Lee, Jae-Mun,Ha, Hyun-Kwon,Kim, Hyun,Park, Young-Ha,Kim, Il-Sun,Kim, Jong-Woo,Bahk, Yong-Whee,Shinn, Kyung-Sub 대한영상의학회 1993 대한영상의학회지 Vol.29 No.2
Adult intussusception is a rare condition, unlike in children. There is an identifiable bowel lesion as a leading point in most of cases. Retrospectively we reviewed 22 patients with adult intussusception, and analyzed CT scans of 13 patients during the last 5 years. Twenty of the 22 patients had various causes of intussusception and 7 patients were as sociated with primary malignancy, 5 patients with benign tumor, and 4 patients with adhesive band. CT scans of 13 cases all showed characteristic target appearance or sausage-like soft tissue mass within the bowel, suggesting intussusception. In eleven of the 13 patients(84.6%) an intussuscepting mass was identified on CT scan as the lead point. Specific diagnosis for the cause of intussusception could be made by CT in four of 13 cases (three lipomas and one mucocle). In conclusion. CT is useful not only for the diagnosis but also for the evaluation of the leading causes of intussusception. Especially, CT could determined the exact causes of intussusception in cases of lipoma and mucocele.
족삼리(足三里) 침자(鍼刺)가 동통억제(疼痛抑制)에 미치는 영향(影響)
신권성,변재영,안수기,황우준,Sin Gun-Seong,Byun Jae-Young,Ahn Soo-Gi,Hwang Woo-Jun 대한침구의학회 1998 대한침구의학회지 Vol.15 No.2
The purpose of this study was finding the pain inhibitory effect of acupuncture at ST-36. The pain at dentes incisor was evoked by noxious electric stimulation and EMG changes based on time interval were measured. To do this, the opioid antagonist was administered intraperitoneally. Followings are some of the results. 1. The pain inhibitory effect of acupuncture at ST-36 was 93.82%, 87.00%, 75.30%, 69.76% at 10 20, 30 and 40 minutes respectively. All the data were calculated based on 100% at 0 minute. The effect was very significant at 40 minutes. 2. The continuous effect of acupuncture at ST-36 after taking out the needle was 77.46%, 79.66%, 87.60%, 91.50%, 95.14%, 99.48% at 50, 60, 70, 80, 90 and 100 minutes respectively. The overall continuous effect was shown its maximum 20 minutes after taking out the needle and reached to the initial value at 60 minutes. 3. The pain inhibitory effect following the naloxone administration and acupuncture application ST-36 was 93.44%, 94.58%, 90.80%, 88.04% at 10, 20, 30 and 40 minutes respectively. All values showed similar tendency to the initial data. 4. The continuous effect of acupuncture at ST-36 after taking out the needle which was preceded by the naloxone administration was 91.26%, 91.90%, 92.06%, 93.66%, 94.12%, 93.50% at 50, 60, 70, 80, 90 and 100 minutes respectively. This trend was not a significant fluctuation. It Was concluded that effect of acupuncture at ST-36 was shown in conjunction with secretion of analgesic substance. Therefore it is implied that the acupuncture application will play a major role in treating many diseases with more revelation of scientific acupuncture mechanism. Further studies of acupuncture manipulation are needed in the future based on our study.
오호혈(五虎穴)이 족과부(足踝部) 체표온도변화(體表溫度變化)에 미치는 영향(影響)
김현중,변재영,안수기,이건목,박용현,김경식,Kim, Hyun-Jung,Byun, Jae-Young,Ahn, Soo-Gi,Lee, Geon-Mok,Park, Yong-Hyun,Kim, Kyung-Sik 대한침구의학회 2001 대한침구의학회지 Vol.18 No.1
Background and Purpose : There have been many studys about the relationship between the meridians and the acupoints of the twelve meridians, but no study about the extra points. To verify Dong-Shi acupoints, a kind of extra points, we studied the effects on the thermal changes of the ankle region following acupuncture on the Wu-Hu. Object and Methods : This study was researched into clinical statistics for 45 healthy normal students. The object was divided into two groups. One was the control group and the other was the acupuncture group. The acupuncture group was divided into two groups ; ACU-up : The class of ascent thermal change among acupuncture group. ACU-dn : The class of descent thermal change among acupuncture group. First, in the control group, we took a picture at the ankle region(BL60, BL62, GB40, ST41) without any stimulation with the Digital Infrared Thermal Imaging System and did after 10 minutes respectively. Second, in the acupuncture group, we took a picture without any stimulation and then acupuncture on Wu-Hu and took a picture after 10 minutes in the same way respectively. Results : 1. In the control group, average thermal change of BL60, BL62, GB40 and ST41 was decreased(about $0.2^{\circ}C$) after 10 minutes. 2. The skin temperature of all measured parts was significantly lower in the ACU-dn group after 10 minutes. 3. There were no significant differences of thermal change between the control and the acupuncture group, between the control and ACU-up group after 10 minutes. Conclusion : This result indicated that the acupuncture on the Wu-Hu was effective at the ankle region. And so the more study is needed continuously.
김현중,이삼로,변재영,안수기,Kim Hyun-Jung,Lee, Sam-Ro,Byun Jae-Young,Ahn Soo-Gi 대한침구의학회 2000 대한침구의학회지 Vol.17 No.3
Objectives : This study was performed to evaluate the clinical results of the spodylolisthesis patients treated with oriental medical methods. Methods : We diagnosed spondylolisthesis by L-spine simple x-ray. 28 patients with spondylolisthesis were hospitalized at WonKwang University KwangJu Oriental Medical Hospital from April 1997 to January 2000 and treated by acupuncture, moxibustion, bed rest, herb-medicine and physical therapy. Results : 1. Distribution showed female predominence(82.1%) in general. 2. In the duration of symptoms, the largest group was the group of "acutest" (32.1%). 3. In the distribution of causes, the largest group was "overwork" (35.7%). 4. Isthmic type is the most common(75%) in etiology. 5. Isthmic type involved the 5th lumbar vertebra in 57.1% and degenerative type involved the 4th lumbar vertebra in 57.1%. 6. Most of cases were grade I(96.4%) in degree of slipping. 7. The common symptoms were radiating pain(92.9%) and low back pain(78.6%). 8. Therapeutic efforts above "good" by Kim's criteria was 20 cases(71.4%) Conclusions : The result of treatment by oriental medical methods is satisfactory for the treatment of spondylolisthsis.
우현영 ( Hyun Young Woo ),김진동 ( Jin Dong Kim ),권정현 ( Jung Hyun Kwon ),배시현 ( Si Hyun Bae ),최종영 ( Jong Young Choi ),윤승규 ( Seung Kew Yoon ),나성은 ( Sung Eun Rha ),변재영 ( Jae Young Byun ),천호종 ( Ho Jong Chun ),최 대한간암연구회 2009 대한간암학회지 Vol.9 No.-
Liver transplantation is curative therapy for hepatocellular carcinoma especially if ,within Milan criteria, 4 year survival and recurrence-free survival was reported to be 85% and 92%, respectively. Herein we report a patient who experience rapid recurrence following living donor liver transplantation (LDLT) for hepatocellular carcinoma within Milan criteria. A 52 year-old-men patient with known liver cirrhosis associated with hepatitis B virus was admitted for the treatment of hepatocellular carcinoma (HCC). Abdominal CT revealed two nodules less than 3 cm in right hepatic lobe. After single session of transcatheter arterial chemoembolization (TACE), the patient underwent LDLT. After seven months following transplantation, recurrent HCC was detected on transplanted liver with concurrent metastatic nodule in lung. Although TACE and metastsectomy were performed for recurrent intrahepatic mass and lung metastasis, recurrent HCC showed rapid progression and patient died of progressive tumor after 10 months following LDLT.