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Effect of Welding Time on Resistance Spot Weldability of Aluminum 5052 Alloy
Gu‑Cheol Kim,Insung Hwang,Munjin Kang,Dongcheol Kim,Hyunsung Park,김영민 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1
In the study, the effect of welding time on resistance spot weldability of aluminum 5052-H32 alloy was analyzed throughsimulation and experiments. The resistance spot weldability was evaluated by measuring the tensile shear strength, nuggetsize, and hardness of welds with variations in the welding time. The simulated results of parameters such as tensile shearstrength and nugget size obtained using the SORPAS program were compared with the experimental results. Furthermore,a simulation was performed to calculate the temperature inside the weld nugget based on the distance from the center of thenugget. Hence, an optimum welding time to retain the required weld strength of the aluminum 5052-H32 alloy was obtained.
장기적 트립토판 결여식이 생쥐의 유해감각예민도에 미치는 영향
서영대,박제민,김명정,전명호,양구범,장세헌,강철중,김정태,김용식 대한생물치료정신의학회 2000 생물치료정신의학 Vol.6 No.1
The depressive patients can be divided into two subgroups by presence and absence of pain symptoms. Those without pain symptoms have blunted pain sensitivity whereas those with pain have normal range of pain sensitivity, and are clinically characterized by anxiety and irritability. The aim of the study is to test if these clinical profiles of the depressives with pain symptoms are related with reduced level of brain serotonin(5-HT). Forty four mice were randomly divided into two groups : one group to be bred with tryptophan free diet and the other with normal control diet, each for 4 weeks. Before the beginning of the breeding period, measured were locomotor activity by open field test, anxiety by elevated plus maze and nociceptive sensitivity by tail flick test, before and after forced swimming(FS). During each FS, duration of immobilization was also measured. The sable sets of measurements were repeated at the end of the breeding period. The brain 5-HT and 5-hydroxyindoleacetic acid(5-HIAA) were measured by high performance liquid chromatography. The results were as follows 1.Four weeks of tryptophan free diet reduced significantly body weight, brain weight, and levels of 5-HT and 5-HIAA in the whole brain. 2.Tryptophan depletion did not influence basal nociceptive sensitivity as measured by tail flick latency before FS. The normal blunting of the pain sensitivity induced by forced swimming was preserved in the tryptophan depleted group. 3.Tryptophan depletion did not influence general locomotor activity in open field. 4.Tryptophan depletion increased significantly time spent on the open arms at the elevated plus maze test done before FS. This anxiolytic-like effect was reduced by FS. 5.Tryptophan depletion did not influence duration of immobilization during FS. From these results, it is suggested that the genesis of the depression with pain symptoms is not medicated by quantitative reduction of brain serotonin
Evaluating Feasibility of Producing Fermented Organic Fertilizer with Vegetable Waste
Kim, Eui-Yeong,Kook, Seung-Woo,Oh, Taek-Keun,Lee, Chang-Hoon,Ko, Byong-Gu,Kim, Seok-Cheol,Kim, Sung-Chul 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.6
Food waste (FW) has been recognized as a critical problem in Korea and many research was conducted to efficiently utilize or treat FW. Main purpose of this research was to evaluate a feasibility for producing fermented organic fertilizer with vegetable waste (VW). Three different organic materials (saw dust, coco peat, and waste mushroom media) were mixed with VW at the rate of 30, 40, 50% respectively. Total days of composting experiment were 35 days and each sub samples were collected at every 5 days from starting of composting. Result showed that inner temperature of composting was increased to $60{\pm}4^{\circ}C$ within 5~10 days depending on varied organic materials and mixing ratio. Among different treatment, the highest increase of inner temperature was observed when 30% of saw dust was mixed with VW. After finishing composting experiment, maturity of each compost was evaluated with solvita and germination test. Maturity index (MI) of each treatment was ranged between 5~7 indicating that manufactured fertilizer was curing or finished stage. Calculated germination index (GI) was at the range of 57.83~101.16 depending on organic materials and mixing ratio. Both MI and GI showed that manufactured fertilizer was met for fertilizer criteria while control (VW only) was not adequate for composting. Overall, VW can be utilized for making organic fertilizer mixing with saw dust, coco peat and more research should be conducted to make high quality of organic fertilizer with vegetable waste.
Kim, Yun-Hae,Kim, Jae-Bong,Hwang, Kwang-Il,Seol, Dong-Il,Doe, Geun-Young,Oh, Cheol,Kim, Sang-Gu,Park, Se-Ho Korean Society for Engineering Education 2010 공학교육연구 Vol.13 No.5
In Korea Maritime University facilities, environment, education and awareness about the Green Campus has been studied in the field. Based on this, domestic and foreign universities and the benchmarking of the environmental characteristics of our university campus environment, the composition of the plan were considered. In this study, based on what our universities have links with the community on what was discussed a lot about. In our university campus tour aimed at young people plan green, and sustainable management measures have been studied.
Kim, Seon-Hong,Lee, Ji-Hoon,Kim, Jung-Gu,Kim, Woo-Cheol Springer-Verlag 2018 METALS AND MATERIALS International Vol.24 No.3
<P>To restrain the failure of the plate heat exchanger (PHE) in customer boiler working fluid, the effect of crevice former type on the corrosion behavior of the 316L stainless steel plate was investigated using electrochemical methods and surface analyses in chloride-containing synthetic tap water (60 A degrees C). The localized corrosion under metal-metal crevice condition was initiated more easily than that under the metal-gasket crevice condition due to the restricted mass transport at the gasket crevice mouth. However, the anodic current under the metal-metal crevice condition was lower than that under metal-gasket crevice condition at a higher anodic potential, indicating that that the metal dissolution under EPDM crevice would be higher than that under metal crevice under the accelerated corrosion condition. Because narrow crevice gap that was formed under gasket accelerated the anodic dissolution at the crevice mouth, the perforation tendency under metal-gasket crevice condition is much higher than that under metal-metal crevice condition. As a result, the crevice geometry, especially the crevice gap, mainly affected the corrosion behavior of PHE material.</P>
Kim, Jin-Hee,Kim, Yong-Kyu,Park, Shin-Gu,Choi, Ji-Ho,Kim, Cheol-Woo,Lee, Kwan-Hee,Ha, Eun-Hee,Hong, Yun-Chul The Korean Society of Toxicogenomics and Toxicopro 2006 Molecular & cellular toxicology Vol.2 No.1
Immunoglobulin E (IgE) plays an important role in the development of allergic disorders including asthma. Cigarette smoking was reported to elevate serum IgE level and air pollutants such as $NO_{2}$ have been reported to modulate the immune system including inflammation. Moreover, genetic polymorphisms of glutathione S-transferases (GSTs) were reported to affect inflammatory diseases including asthma. Therefore, in the present study we tried to investigate whether tobacco smoke or $NO_{2}$ exposure increases the level of IgE and the GST gene polymorphisms are associated with change of IgE level due to tobacco smoke or $NO_{2}$ exposure. We measured urinary cotinine, personal $NO_{2}$ exposure, and serum IgE levels in 300 healthy university students without allergic disorders. Allelic loss of the GSTM1 and GSTT1 and the GSTP1 (lle105Val) polymorphism were determined by PCR and RFLP. Total serum IgE levels were significantly different according to urinary cotinine levels (P=0.046), while $NO_{2}$ passive dosimeter level and genetic polymorphisms of three GSTs were not associated with total IgE level. Moreover, subjects with cotinine $500\;{\mu}g/g$ creatinine or more showed the highest level of total IgE when they had null type of GSTM1, null type of GSTT1, or variant type of GSTP1 (P<0.05). When we considered IgE level according to urinary cotinine levels in strata with the combinations of GSTM1, GSTT1, and GSTP1 genetic polymorphisms, the subjects with GSTM1 null, GSTT1 null, and GSTP1 variant types showed the largest difference between IgE levels of subpopulations according to cotinine levels (P=0.030). However, there was no significant difference between IgE levels of subpopulations according to $NO_{2}$ passive dosimeter levels in any group with combinations of GSTM1, GSTT1, and GSTP1 polymorphisms. This result suggests that smoking increases allergic response measured as IgE level and combinations of the GSTM1, GSTT1, and GSTP1 polymorph isms modify the effect of smoking on serum IgE level.
김동규,김성진,김정한,모은경,이명구,장현주,정기석,김철홍,현인규,박명재 대한내과학회 1999 대한내과학회지 Vol.56 No.1
Cryptococcosis has been considered as an opportunistic mycosis associated with depressed immune function of the host. However, it may develop in healthy individuals without any underlying disease. Recently, we experienced a case of pulmonary cryptococcosis in healthy person. The patient had experienced hemoptysis and dry cough persisted for a month. The chest X-ray and CT showed multifocal pneumonic consolidation containing small cavities in RLL, LUL and LLL. Fiberoptic bronchoscopy didn't revealed endobronchial lesion in both lungs. Transbronchial lung biopsy(TBLB) was done, and we could diagnose pulmonary cryptococcosis by means of histopathologic examination. Clinical evaluations did not reveal immune deficiency or evidence of other specific disease. The patient was treated with fluconazole and resulted in clinical and radiological improvement. Cryptococcosis has well known for its meningeal involvement. Although primary pulmonary cryptococcosis is rare, we must think of it when meet mass or nodular lesion on the chest radiology.
김지영,김병구,김민철,이태관,김수경,이광민,백현선,조덕수,주명진 대한내과학회 1997 대한내과학회지 Vol.52 No.3
This article describes a case of intra-abdominal desmoplastic small round cell tumor(DSRCT) experienced by the authors. The patient was 36ear old male, and admitted because of the mass of right inguinal area, back pain, weakness of low extremities. Imaging studies, right inguinal mass biopsy finding, immunohistochemical stains were compatible with DSRCT. Aggressive treatment with chemotherapy resulted in remarkable response temporarily in terms of tumor size and pulmonary metastasis. But as other author`s reports, multiple metastases to brain, spine, lung were progressed in our case. The patient died 13months after diagnosis.