입열량이 고변형률 강관 원주 용접부 특성에 미치는 영향

이진우,송우현,서동한,이종섭,Lee, Jin-Woo,Song, Woo-Hyun,Seo, Dong-Han,Lee, Jong-Sub 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.6

SBD (Strain-based design) of pipe lines have gained world-wide attention in recent years. The present research aims to evaluate the fracture characteristics of API (America Petroleum Institute) SBD X100 girth weldment that typically applied for cold climate and deep water offshore, with the focus on the influence of heat input changing with 6kJ/cm and 10kJ/cm from GMAW (Gas Metal Arc Welding). At a low heat input at 6kJ/cm, the weld metal had Multi-phase matrix (Acicular ferrite + Banite + Martensite) that could fill up both fracture toughness and strength as reported previously. Also, the weld metal exhibited 859MPa YS (Yield strength), 108J impact toughness at $-40^{\circ}C$ and 0.52mm CTOD (Crack Tip Open Displacement) at $-10^{\circ}C$. These results can be satisfied with the requirement of API SBD X100 girth weldment and Alaska pipe line project.

섬유아세포에서 프로모터 다형성에 의한 Matrix Metalloproteinase-1의 발현에 관한 연구

이진우,정유정,봉심규,박노준,이상헌,노민수,임경민,김수남,Lee, Jin Woo,Jung, Yujung,Bong, Sim-Kyu,Park, No-June,Lee, Sang Heon,Noh, Minsoo,Lim, Kyung-Min,Kim, Su-Nam 대한화장품학회 2021 대한화장품학회지 Vol.47 No.3

본 연구는 피부 섬유아세포에 자외선을 조사하거나 TNF-α를 처리하면 세포에 따라 MMP-1의 발현이 다르게 나타나는데, 이것이 MMP-1 프로모터의 다형성에 의해서 나타남을 밝히기 위해 수행되었다. 시판하는 23 종의 primary 섬유아세포에 대하여 MMP-1 프로모터의 -1607 부위의 유전형을 분석한 결과 6 개의 1G/1G 유전형, 10 개의 1G/2G 유전형, 7 개의 2G/2G 유전형을 가진 섬유아세포를 확인할 수 있었다. Hs68과 Detroit 551 세포주는 1G/2G 유전형을 가지는 것으로 확인되었다. 1G/1G 유전형은 TNF-α 처리에 의해 대조군에 비해 MMP-1이 2 배 높게 발현되었으며, 자외선에 의해서는 거의 발현되지 않았다. 1G/2G 유전형의 경우는 TNF-α 처리에 의해 MMP-1이 2.45 배 높게 발현되었으며, 자외선에 의해서는 1.4 배 MMP-1이 발현되었다. 2G/2G 유전형의 경우는 TNF-α 처리에 의해 MMP-1이 1.35 배 발현되었으며, 자외선에 의해서는 2.5 배로 높게 발현되었다. 즉 1G 유전형은 TNF-α에 의해, 2G 유전형은 자외선에 의해 발현이 유도되는 것으로 추정할 수 있으며, -1607 위치에 하나 더 삽입된 G에 의해서 Ets 전사인자가 결합할 수 있는 site가 만들어져서 MMP-1의 발현이 증가한다고 추정할 수 있으며, 피부 노화와 관련하여 섬유아세포에서는 이에 대한 연구가 전혀 진행되어 있지 않아서 향후 추가로 연구되어야 할 부분이다. 피부는 내인성 노화와 광노화의 영향을 동시에 받는 기관이므로, 피부 노화를 개선하기 위한 타겟으로 MMP-1의 발현을 분석할 경우에는 실험 조건에 적합한 유전형을 가지는 세포를 선택하여 연구를 진행하는 전략을 세워야 할 필요성이 대두된다. The skin fibroblasts of different origins showed different expression levels of MMP-1 in response to TNF-α treatment or UV irradiation. We hypothesized that this is caused by polymorphism in the MMP-1 promoter region. To elucidate it, first of all, we analyzed and classified the genotype of the -1607 site of the MMP-1 promoter in 23 commercially available primary fibroblasts, and then we examined the expression of MMP-1 by TNF-α or UVB stimulation for each classified genotype. As a result of the analysis, fibroblasts with 6 1G/1G genotypes, 10 1G/2G genotypes, and 7 2G/2G genotypes were identified. Hs68 and Detroit 551 cell lines were confirmed to have 1G/2G genotypes. In the 1G/1G genotype, MMP-1 was expressed twice as high as that of the control group by TNF-α treatment, and was hardly expressed by UV light. In the case of the 1G/2G genotype, MMP-1 was expressed 2.45 fold higher by TNF-α treatment, and 1.4 fold by UV light than the control. In the case of the 2G/2G genotype, MMP-1 was expressed 1.35 fold by TNF-α treatment, and was highly expressed by 2.5 fold by ultraviolet rays compared to control. It can be estimated that MMP-1 expression is better induced in the 1G genotype by TNF-α and in the 2G genotype by UV light. In addition, it can be presumed that MMP-1 expression is increased by creating a site where the Ets transcription factor can bind by another G inserted at the -1607 position. These studies have not been conducted at all in fibroblasts in relation to skin aging, so it is an area that needs to be further studied in the future. In conclusion, since the skin is an organ that is affected by both intrinsic aging and photoaging at the same time, when analyzing the expression of MMP-1 as a target for improving skin aging, it is necessary to select cells with a genotype suitable for the experimental conditions of the study.

저항클래딩법을 응용하여 형성된 내마모성 WC-6.5Co 클래딩층의 미크로조직 특성

이진우,고준빈,이영호,Lee, Jin-Woo,Ko, Jun-Bin,Lee, Young-Ho 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.3

This study deals with characterizations of microstructure and wear performance of a cladding layer, product on 1.9 mm-thick mild steel plate by the electric resistance welding, of composite metal powder of Coarse WC-6.5%Co and high carbon alloy (SHA). The cladding layer was examined and tested for microstructural features, chemical composition, hardness, and bondability. The cladding layer have two different matrix were observed by an optical microscope and EPMA. The one was the coarse WC-6.5Co structure. The other was the melted SHA with surrounding the WC-6.5Co structure. The hardness of WC-6.5Co was 1210HV. The hardness of SHA was 640HV.

노인들의 건강증진생활양식에 관한 연구 - 전북 농어촌지역을 중심으로 -

이진우,정명수,이춘우,권소희,고광재,정재열,장두섭,송용선,이기남,Lee Jin-Woo,Chong Myung-Soo,Lee Chun-Woo,Kwon So-Hee,Ko Kwang-Jae,Jeoung Jae-Yeal,Jahng Doo-Sub,Song Yung-Sun,Lee Ki-Nam 대한예방한의학회 2001 대한예방한의학회지 Vol.5 No.2

This investigation grasps the level and relevant elements of performance of health promotional activities for the elderly in Korea. It provides fundamental data on health promoting projects targeting the elderly population from farming villages. Hence, this study gropes for an effective approach and measures of health promoting programs. The program needs to be developed with a focus on elderly people from farming villages. In addition, it was carried out in order to provide basic data for development of health projects for local communities. Data gathering was based on survey data targeting patients from the free clinic service. Service was rendered for the residents of farming villages, and conducted at the Offices of CheonBuk Province from October 2000 to December 2000. Analytical results were used to examine the health promotional method for the elderly in the aspect of Oriental Medicine. SPSS 9.0 version as well as T-test and ANOVA were used for survey data analysis. Piersons correlation coefficient was utilized for the relationship for each area, obtaining the following analytical results. 1. The average score for the activities of health promotion was 2.28. Looking at each subcategory, stress management was the highest at 3.65; interpersonal relationship, 3.00; nutrition, 2.55; health responsibility, 2.15; self-realization, 2.03; and exercise was the lowest at 1.89. 2. With respect to lifestyle of the health promotion secondary to general features of elderly people from farming villages, the level of activities of health promoting lifestyle was shown to be higher for males than that of females. Self-realization area was high among males in detailed particulars while the level of execution was high as age decreases in the stress area. 3. Regarding health promoting life style secondary to socioeconomic characteristics, the level of execution was higher for the individuals with a higher level of education and further utilization of spare time. With respect to occupation, the level was highest for people from the fishery. The level decreased in the order of other occupations such as trade, unemployed and agriculture, which was shown to be the lowest. In detailed particulars, it revealed that higher the individuals educational level, the higher the self-realization and stress management areas. The level of interpersonal relationship was the highest among people with little or no education. With respect to self-realization area, the level was highest among the cases where one paid living expenses along with their children. The lowest level of living expenses was seen in the cases where an individual pays for living expenses by himself/herself. There were significant results in all areas except for nutrition areas depending on occupation. The fishery was shown to be the highest. The level of activities was higher as one utilizes more spare time in all areas except for the area of interpersonal relationship.

대역폭의 제한을 받는 TCP over ATM의 특성

이진우,박기태,김진태,김형래,박인갑,Lee, Jin-Woo,Park, Ki-Tae,Kim, Jin-Tae,Kim, Hyung-Lae,Park, In-Kap 한국전기전자학회 1997 전기전자학회논문지 Vol.1 No.1

The Asynchronous Transfer Mode(ATM) networks are being adopted as backbones over various parts of Internet. Also, TCP is one of the most widespread transport protocols, nowdays. It can be used with ATM. But, TCP shows poor end-to-end performance on ATM networks. Effective throughput of TCP over ATM can be quite low when cells are dropped at the congested ATM switch. The low throughput is due to wasted bandwidth as congested link transmits cells from corrupted packets. This paper examines the behavior of TCP over ATM with limited bandwidth in a broadband environment. As multiple VBR sources occupies most of the available bandwidth, there has been a starvation effect, so TCP sources couldn't get the chance of transmitting data. Also, throughput is proportional to the amount of buffer.

차실-트렁크 연성계의 연성경로 및 음향모드 특성에 관한 실험적 연구

이진우,김규범,이장무,김석현,박동철,Lee, Jin-U,Kim, Gyu-Beom,Lee, Jang-Mu,Kim, Seok-Hyeon,Park, Dong-Cheol 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.8

This study identifies the major coupling path by examining the variation of the coupled acoustic modal frequencies and modes. A 1/2-size acryl compartment model is designed and manufactured for the measurement and analysis of coupled acoustic modes. Due to acoustic coupling, a new acoustic mode appears in a low frequency range. This coupling affects only longitudinal acoustic modes of compartment. Experimental result shows that the package tray holes contribute to the coupling much more than the back seat and hole size is an important design factor to control low frequency acoustic modes in the coupled system.

TCP over ATM의 성능 개선에 관한 연구

이진우,박기태,김진태,김래진,박인갑,Lee, Jin-Woo,Park, Ki-Tae,Kim, Jin-Tae,Kim, Nae-Jin,Park, In-Kap 한국전기전자학회 1998 전기전자학회논문지 Vol.2 No.1

The Asynchronous Transfer Mode(ATM) networks are being adopted as backbones over various parts of Internet. Also, TCP is one of the most widespread transport protocols, nowadays. It can be used with ATM. But, TCP shows poor end-to-end performance on ATM networks. Effective throughput of TCP over ATM can be quite low when cells are dropped at the congested ATM switch. The low throughput is due to wasted bandwidth as congested link transmits cells from corrupted packets. This paper examines the behavior of TCP over ATM-UBR using EPD switch in a broadband environment. With a threshold close to the buffer size, the buffer can be used more efficiently, but more drops and retransmission occurs. If the threshold is much less than buffer size, efficient is not good, but few drops can happen. Therefore, decision of the threshold is important.

배수방식에 따른 온수 방류의 3차원 수치모의

이진우,이승오,김창완,조용식,Lee,Jin-Woo,Lee,Seung-Oh,Kim,Chang-Wan,Cho,Yong-Sik 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1

The mixing characteristics of heated water discharged from different types of effluents are simulated using a commercial software, Flow-3D model. In order to verify the model, the comparison of numerical results with the experimental data are conducted for each type of effluent, the submerged and surface overfall. It is observed that the numerical results show a reasonable agreement with the experimental data. Based on this study the application to the heated water discharge problem in the field can be expected as a further study and it can be the fundamental data when determining the type of effluent in a powerplant.

개에서 prednisolone을 이용한 호산구성 장염 치료 증례

이진우,이선희,임수정,박형진,정대욱,김태신,김덕환,송근호,Lee, Jin-Woo,Lee, Sun-Hee,Lim, Soo-Jung,Park, Hyung-Jin,Jung, Dae-Wook,Kim, Tae-Sin,Kim, Duck-Hwan,Song, Kun-Ho 대한수의학회 2010 大韓獸醫學會誌 Vol.50 No.4

A 7-year-old, castrated male Yorkshire terrier dog with chronic vomiting, and melena lasted for 3 weeks was referred to the Veterinary Medical Teaching Hospital of Chungnam National University. The complete blood counts and serum biochemistry revealed no remarkable findings. Gastrointestinal series revealed irregular margin in small intestinal lumen. After upper gastrointestinal series, erythema of the small intestinal lesions was found by exploratory laparotomy and full-thickness biopsy was performed. Histopathologic examination revealed infiltration of predominantly eosinophils and other inflammatory cells in small intestine. Based on these findings, the dog was diagnosed as eosinophilic enteritis. After 4 weeks medical treatment and hypoallergenic diet, the patient showed no vomiting, melena and other complications.

다중 VBR 소스를 갖는 TCP over UBR-EPD의 특성

이진우,김진태,유영길,Lee, Jin-Woo,Kim, Jin-Tae,Yoo, Young-Kil 대한전자공학회 1999 電子工學會論文誌-T Vol.t36 No.4

The Asynchronous Transfer Mode(ATM) networks are being adopted as backbones over various parts of Internet. TCP is one of the most widespread transport protocols and can be used with ATM. But, TCP shows poor end-to-end performance on ATM networks. Effective throughput of TCP over ATM can be quite low when cells are dropped at the congested ATM switch. As congested link transmits cells from corrupted packets, it wastes bandwidth and throughput becomes low. This paper examines the behavior of TCP over ATM-UBR using EPD switch in a broadband environment. As threshold value closes to the buffer size, the buffer can be used more efficiently, but more drops and retransmission occur. If the threshold value is much less than buffer size, efficiency becomes low, but few drops can be happen. Therefore, the decision of threshold value becomes important factor.