MQL 선삭가공시 가공조건의 표면거칠기 영향 분석

이춘만,황영국,정종윤 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

At present, industry and researchers are looking for ways to reduce the use of lubricants because of ecological and economical reasons. Therefore, metal cutting is to move toward dry cutting or semi-dry cutting. This paper presents an investigation into MQL(Minimum Quantity Lubrication) machining with the objective of deriving the optimum cutting conditions for the turning process of SM45C. To reach these goals several finish turning experiments were carried out, varying cutting speed, feed rate and oil quantity, with MQL. The surface roughness results of tests were measured and the effects of cutting conditions were analyzed by the method of Analysis of Variance(ANOVA). From the experimental results and ANOVA, it is found that a better surface roughness can be obtained by decreasing oil quantity and feed rate.

도둑놈의 갈고리로부터 생산된 항비만성 Lipase 저해제와 시판 Lipase 저해제의 활성 비교

이종국 ․ 강민구 ․ 이종수 배재대학교 자연과학연구소 2011 自然科學論文集 Vol.22 No.1

Obesity is the cause of various diseases including high blood pressure, diabetes, hyperlipidemia, and cerebrovascular accidents. Therefore, development of new anti-obesity nutraceuticals or drugs is necessary. In previous paper, we selected Desmodium oxyphyllum as a potent lipase inhibitor-containing herb. In this study lipase inhibitory activity of Desmodium oxyphyllum and commercial lipase inhibitor were determined and compared. Lipase inhibitory activity of extract from Desmodium oxyphyllum showed 67.4%, whereas commercial lipase inhibitor showed more high 85.3% rater than that of Desmodium oxyphyllum.

방향성 마스크를 이용한 손실 영상 복원

함종국,이용학 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2

In this paper, the interpolation method using direction mask is proposed. After inserting zero into the loss area of the edge image, the information of the direction and the similar intensity property of the edge are obtained by the direction mask and the interpolation is performed from the estimated information. To analyze the performance of the proposed method, three images which have different loss areas are selected and the interpolated images by the proposed method have the improved PSNR about 4∼5㏈ and the reduced blur effect than compare to the conventional linear interpolation method.

추간판 응력분포에 대한 광탄성 해석

신현국,이재창,안면환,안종철,인주철 영남대학교 의과대학 1989 Yeungnam University Journal of Medicine Vol.6 No.2

요추의 중립위, 굴곡위 및 신전위에서의 응력 분포의 차이와 수핵의 유무에 따른 응력 분포의 변화를 관찰하기 위해 본 연구를 시행 하였으며 등색선의 양상을 관찰하고 그 응력을 해석하여 다음과 같은 결론을 얻었다. 1. 기립 중립위에서는 수핵이 있는 경우는 전방 부위보다 후방부위에 고응력이 집중되었으며, 전후방 모두 내측부와 중간부위가 고응력이고 외측부로 이동할수록 적응력이 관찰되었다. 수핵이 없는 경우는 후방보다 전방부에 고응력이 집중되었으며 국소적으로 응력이 집중되는 양상을 보이고 있다. 2. 최대 굴곡위에서는 수핵의 존재에 관계없이, 전방보다 후방부에 고응력이 집중되었으며, 수핵 유무 비교시 수핵이 있는 경우가 없는 경우보다 전방이 저응력, 후방은 거의 동등한 응력 분포를 나타냈었다. 응력 분포도의 분석에 의하면 전반적으로 균등한 응력 분포 양상을 나타냈다. 3. 최대 신전위에서는 수핵 유무에 관계없이 전방부에 고응력, 후방부에 저응력, 내측에 고응력, 외측은 저응력을 나타내었으며, 수핵이 있는 경우 없는 경우보다 고응력을 나타냈다. 4. 기립 중립위와 최대 굴곡위의 비교에서는 기립 중립위보다 굴곡시 수핵의 유무에 관계없이 전반적으로 후방부 응력이 2차 정도 현저히 감소하는 양상을 보이면서 비교적 균등한 응력 분포를 나타냈다. 5. 최대 신전위와 최대 굴곡위의 비교에서는 수핵 존재시 최대 신전위보다 최대 굴곡위에서 응력 분포가 전후방 모두 2차 정도 감소되고 수핵이 없는 경우는 최대 신전위가 굴곡위보다 응력이 전후방 0.5차 정도 감소되었다. To observe the change in the status of stresses according to three different postural angulation of an intervertebral disc with or without nucleus pulposus, 6 specimens of a 3-dimensional photoelastic model of the spine were made of epoxy. The nucleus pulposus portion was replaced with silicon in three models, and the three were made without silicon. Through axial application of a vertical compressive load of 8㎏, the peculiar patterns of the isochromatic fringes were observed, Stresses on the intervertebral disc were analyzed according to three different postural angulations of the intervertebral disc with the nucleus pulposus and without the nucleus pulposus. The results of these study are as follow : 1. In an erect neutral posture with the nucleus pulposus, the stress concentration was much increased at the posterior portion rather than at the anterior portion. Also, the high stress was concentrated at the medial and central portion. In an erect neutral posture without the nucleus pulposus, the stress concentration was much increased at the anterior portion rather than at the posterior portion and the stress distribution seemed to be locally concentrated. 2. In a maximal flexed posture, the stress concentration was much increased at the posterior portion rather than at the anterior portion. Comparing the presence of the nucleus pulposus with the absence of the nucleus pulposus, the stress concentration was lower at the anterior portion in the presence of the nucleus pulposus than in the absence of the nucleus pulposus. However, the stress distribution at the posterior portion was nearly same in the two groups. According to the analysis of the stress distribution diagram, as a whole, the stress pattern around the disc was evenly distributed. 3. In a maximal extended posture, the higher concentration of the stress distribution at the anterior and medial portion rather than in the posterior and lateral portion was observed. The stress concentration was higher in the presence of the nucleus pulposus than in the absence of the nucleus pulposus. 4. Comparing the maximal flexed posture with the erect neutral posture, the stress concentration in the flexed posture was much decreased in the posterior portion rather than in the erect neutral posture, and an even distribution of the stress pattern in the flexed posture was observed. 5. In the absence of the nucleus pulposus, at the anterior and posterior portion, the stress concentration in the extended posture was much decreased compared with the flexed posture. In the absence of the nucleus pulposus, at the anterior and posterior portion, the stress concentration in the extended posture was much decreased compared with the flexed posture.

1.0% Cu 함유 열연강판의 기계적 성질에 미치는 시효처리의 영향

김인배,이종국 釜山大學校生産技術硏究所 2002 生産技術硏究所論文集 Vol.61 No.-

1.0% Cu를 함유한 열연강판의 기계적 성질에 미치는 pre-strain과 시효처리의 영향을 조사하였다. 시효처리전의 pre-strain량이 증가함에 따라 최고경도를 나타내는 시효시간은 단시간쪽으로 이동하였고, 최고경도 역시 상승하였다. 10% pre-strain을 부여할 경우 인장강도는 600MPa로서 열연상태보다 약 150 MPa상승하였으며, pre-strain이 30%일 경우에는 열연상태보다 약 210MPa 상승하여 657MPa이었다. 이러한 결과는 pre-strain이 재료를 가공경화 시켰을 뿐만 아니라 Cu-clusters의 석출을 촉진시켰기 때문이다. 시효처리에 의하여 석출되는 Cu-clusters는 전위와 무관하게 결정립내에 미세분산 석출되었는데 이것은 Cu-clusters의 석출이 pre-strain에 의하여 형성된 원자공공의 농도에 지배되었음을 의미한다. 그리고 최고경도에서 석출되는 Cu-clusters의 크기는 10∼20nm정도이었다. Effects of pre-strain and aging treatment on the mechanical properties of 1% Cu containing hot rolled steels were investigated. As increasing the amount of pre-strain, the hardness increased and the time to reach peak hardness decreased Tensile strength of 10% pre-strained steels was 600MPa, and this value was about 150MPa higher than that of hot rolled steel. Futhermore, tensile strength of 30% pre-strained steel showed much higher value of 657MPa. This strength increase was due to the strain hardening and promoted precipitation of Cu-clusters by the pre-strain process. It was confirmed by TEM observation that Cu-clusters were precipitated finely dispersed throughout the grain inside. This result means that the precipitation of Cu-clusters was mainly controlled by the concentration of vacancies which were created by the pre-strain process. And the size of Cu-rich clusters was about 10∼20nm at peak aged condition.

자궁경부 종양에서 Nested PCR을 이용한 인유두종 바이러스 16형 및 18형의 검출과 임상적 의의

최규연,이종국,최승도,배동한,김휘준,김민관 순천향의학연구소 1999 Journal of Soonchunhyang Medical Science Vol.5 No.2

The aim of this study is to estimate the prevalence of HPV types(16, 18) in cervix of gynecologic patients and to elucidate the relationship of HPV types(16, 18) and clinical characteristics. Human papilloma virus(HPV) has attracted attention as one of the viruses linked to human cancers. Numerous clinical, epidemiological, and molecular studies indicate that certain genital HPV types are associated with cervical carcinoma. Of 100 types of HPV identified today, at least 40 have been found in the anogenital mucosa. A classification of these types into three groups with differing pathogenicity has been proposed: HPV type 6, 11, 42, 43, and 44 are detected more frequently in benign lesions such as condylomata; HPV type 31, 33, 35, 51, 52, and 58 are found more often in low grade squamous intraepithelial lesions than invasive lesions; and HPV 16, 18, 45, and 56 are predominant in high grade squamous intraepithelial lesions and invasive carcinoma. To detect HPV types prevalent in carcinoma of the uterine cervix, a type-specific, sensitive polymerase chain reaction(PCR)-based assay for HPV types 16, 18 was applied to 18 cervical carcinomas(15 squamous cell carcinomas and 3 adenocarcinomas), 21 cases of cervical intraepithelial neoplasia(CIN), and 42 samples of cervicitis and histologically normal. DNA extraction from cervical swab was done using DNAzol™(MBI, USA) and Nested PCR was done using HPV detection kit(Bioneer, Korea). The amplified product was analyzed directly on the basis of the site of ethidium bromide-stained band visible after agarose gel electrophoresis. The results were as follows 1. The positivity rates of HPV type 16 and HPV type 18 were 12.5%(90/718), 2,5%(18/718). so, HPV 16 positive cases(12.5%) was five folds as HPV 18 positive cases(2.5%) 2. Forty eight percents(39/81) of HPV 16 or HPV 18 positive cases were CIN, microinvasive cancer. 3. Age, Gestation number, Clinical stage, Histologic cell type in relation to HPV types were not statistically significant.

폐지 용액화물로부터 성분분리 및 분석

장준복,양재경,임부국,이종윤 한국목재공학회 2004 목재공학 Vol.32 No.1

본 연구는 폐지로부터 용액화물을 제조하고, 제조된 용액화물의 성분 분리 및 성상분석을 통해 용액화물의 효율적인 이용방안을 위한 기초자료 제공에 그 연구 목적이 있다. 폐지의 액화에 있어 건식해리된 폐지보다 습식해리된 폐지의 액화가 비교적 용이하였으며, 이러한 이유는 습식해리된 폐지의 약품 침투가 비교적 용이하기 때문으로 판단된다. 폐지의 최적 액화조건은 폐지 1g에 대해 크레졸 2㎖, 물 4㎖, 인산 0.5㎖로 첨가하여 190℃에서 60분간 액화 시킨 조건이 가장 우수하였다. 폐지 액화물 중 리그닌은 용제인 크레졸 층으로, 탄수화물은 수층으로 용해되어 각각 분리되며, 두 성분의 분리·회수는 비교적 용이하였다. 액화 폐지 중의 리그닌은 80% 이상 회수되었고, 회수된 리그닌의 분자량은 1,000 정도의 저분자량을 나타냈었다. This research was carried out to investigate the component isolation method from liquefied waste paper. and isolated component was analyzed by molecular weight distribution with gel chromatography and nitrobenzene-oxidation analysis. In the aspect of liquefaction ratio, wet defibration fiber are better than dry defibration fiber because of wet defiberation fiber was easy to access of chemical solution. The optimal liquefaction condition of waste paper was treated at 190 C for 60 min(creso1 2 me, water 4 me, phosphoric acid 0.5 ㎖ based on waste paper 1 g). In the liquefied waste paper, lignin and carbohydrate were separated with two interfacial layer(creso1 layer, water layer). In the chemical analysis of isolated lignin, molecular weight distribution of isolated lignin was below 1,000.

Research Articles : Extraction and Characteristics of Anti-Obesity Lipase Inhibitor from Phellinus Linteus

( Jong Kug Lee ),( Jeong Hoon Jang ),( Jong Tae Lee ),( Jong Soo Lee ) 한국균학회 2010 Mycobiology Vol.38 No.1

Separation and characteristics of Bacillus spp. with fibrinolytic activity from traditional sauces in Chungnam region

Jong-Kug Lee,Jeong Lee,Yoon-Jeong Cho,Jin-Ju Park 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10

This study selected Bacillus spp. with excellent fibrinolytic activity from traditional paste in Chungnam region and investigated its characteristics Recently, westernized eating habits have led to an increase in diseases such as heart attacks and diabetes, and related mortality rates are also increasing. One of these representative causes is abnormal blood clots in the human body. Fibrinolytic enzymes have properties that can dissolve blood clots composed of fibrin. 271 kinds of traditional paste in Chungnam region were collected, and 117 kinds of Bacillus spp. were separated from the collected traditional paste. Among them, 27 types of Bacillus spp. with excellent fibrinolytic activity were selected, and γ-PGA content, total phenol, amino type nitrogen content, and antioxidant activity were investigated.

Aortic Cross Clamp

Kug Jong Lee 대한외과학회 2012 대한외과학회 학술대회 초록집 Vol.2012 No.11