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금속분말 사출성형법을 이용한 자수기용 로터리 훅 제조 연구
김상윤,박시우,정일섭,정재옥,조규상,Kim, Sang Yoon,Park, Si Woo,Chung, Ilsup,Jung, Jae Ok,Cho, Kyu Sang 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.4
Embroidery process is the last stage of manufacturing textile products by sewing thread mechanism. The rotary hook that is manufactured by several stages of precision machining is a key part of completing the knot in embroidery. The rotary hook was manufactured by applying MIM (metal injection molding) techniques techniques, which combine the advantages of injection molding and metal powder sintering technologies, to obtain high productivity and dimensional accuracy. The sintering of injection product was performed at a temperature between $600^{\circ}C$ and $1,275^{\circ}C$ in an atmosphere of Argon with a relative density of 99% at $1,275^{\circ}C$ to 99% at the sintering temperature. A product with a hardness of 700 HV was manufactured by heat treatment. All the prescribed patterns were completed without obtaining a prescribed pattern for the developed prototype. Further, the wear test of the hook body carried out using gold thread also showed a similar decrease in size compared to that of the existing product. In this study, the manufacturing method was developed by applying MIM techniques to replace the manufacturing process of the rapidly executed rotary hook that entails various stages of machining. The developed manufacturing process is expected to boost the competitiveness of Korea's embroidery industry by replacing imports and contributing to more than 30% cost savings.
엄상검체에서 분리한 Vibrio parahaemolyticus의 생 물학적성상, 혈청형, toxR 유전자의 검출 및 시험관내 항균제 감수성
김신무 ( Shin Moo Kim ),송남경 ( Nam Kyung Song ),정재옥 ( Jae Ok Chung ),신상희 ( Sang Hee Shin ),소향아 ( Hyang Ah So ),이규식 ( Gyu Sik Lee ),정윤섭 ( Yun Sop Chong ) 대한임상검사과학회 2000 대한임상검사과학회지(KJCLS) Vol.32 No.3
Vibrio parahaemolyticus is one of the most important food-bome pathogens in Korea, Japan, and other cOlllltries with long coast1ines. The aim of this study was to determine the biochemical characteristics, serovar, antimicrobial, susceptibi1ity and possession of toxR gene of the 46 V. parahaemolyticus isolates from c1inical specimens. Biochemical characteristics of the these were typical, but 28 % and 4 % of isolates showed negative to Simmon citrate and omithine decarboxylase test, respectively. Six kinds of serovars were detected in the isolates. Serovar 03:K6 were most prevalent i.e., 85%. Other serovar inc1uding 03:K9, 03:K55, 03:K56, 03:KUT and R were veη rare. Most of the isolates were resistant to ampici11in, carbenici11in and cefazolin, but none were resistant to most of the other antimicrobial agents including tetracyc1ine, which is the drug of choice for the treatment of Vibrio infection. V. parahaemolyticus toxR gene was detected from all of the 46 isolates. It is conc1uded that the biochemical characteristics of most of the V. parahaemolyticlα of isolated Wonkwang University Hospital are typical, that prevalent serovar are 03:K6, and that isolates with antimicrobial resistance with the exception ampicillin, carbenicillin 뻐d cefazolin are very rare. Also toxR gene detection by the PCR test can be used for rapid identification of the V. parahaemolyticus in the c1inical laboratory.
건강인의 비인강내 MRSA 보균율과 methicillin 내성 포도구균에서의 mecA와 femA 유전자의 검출
김신무 ( Shin Moo Kim ),송남경 ( Nam Kyung Song ),신상희 ( Sang Hee Shin ),정재옥 ( Jae Ok Chung ),이규식 ( Gyu Sik Lee ),김유현 ( Yoo Hyun Kim ),오재세 ( Jae Se Oh ),차정단 ( Chong Dan Cha ),문상은 ( Sang Eun Moon ),김강주 ( Kang 대한임상검사과학회 1999 대한임상검사과학회지(KJCLS) Vol.31 No.2
Nasal carriage rate and methici11in resistance of Staphνlococcus aureus in healthy adults are not well known in Korea. In this study, nasal specimens collected from college students during March to June, 1998 were cultured for S. aureus and the susceptibility of the isolates was determined by agar di1ution method and the relationship of methici11in resistance level and 서 -lactamase production was analyzed. Also, presence of mecA and femA was detected from the isolates by PCR. Isolation rate of S. aureus from the 339 subjects was 20%, and the rate was higher in female (21%) than in male (12%). Among the isolates, 2.1% were MRSAs. Against MSSA, clindamycin, fusidic acid, mupirocin and vancomycin were most active (MICso50 ≤1 μgjml and MIC90 2 μgj ml) and the resistancerates to cephalothin, eηthromycin , gentamicin and tetracyc1ine 20% and to chloramphenicol and penicillin G, were 73%. The MIC range of oxacillin against MRSA was 16-≥ 128 μgj ml, while MICso and MIC90 were 32 μgjml and 128 μgjml, respectively. Fusidic acid, mupirocin and vancomycin were most active against MRSA (both MICso and MIC90 were 1 μgjml). Resistance rate of MRSA to c1indamycin was 18%, but they were ~59% to 6 other antibiotics. ß -lactamase-producing strains were more prevalent among the low level methicillin-resistant isolates. mecA was detected from all MRSAs, but none from MSSAs. femA was detected from all of the MRSAs and MSSAs and none in coagulase-negative staphylococcus. In conc1usion, hea1thy adults occasiona11y carη MRSAs, but they may have acquired them in hospitals. Fusidic acid and vancomycin should be useful to treat MRSA infection, while mupirocin should be useful to control nasal carriage. me때 and femA may be used to differentiate MRSA from MSSA, and S. aureus from coagulsae-negative staphylococcus, respectively.
ICU환자에서 Imipenem 내성 Acinetobacter baumannii와MRSA의 분리 및 항균제 감수성
김신무 ( Shin Moo Kim ),이나영 ( Na Young Lee ),정재옥 ( Jae Ok Chung ) 대한임상검사과학회 2001 대한임상검사과학회지(KJCLS) Vol.33 No.2
Infections in ICU patients are often due to mu1tiple antibiotic resistant bacteria, such as MRSA and Acinetobacter spp. hnipenem-resistant gram-negative bacilli has been increasingly reported in other countries. The aim of this study was to determine the prevalence of MRSA and Acinetobacter spp. In ICU patients and to compare antimicrobial reisistance of imipenem-resistant and susceptible Acinetobacter isolates. Respiratory specimens were taken from ICU patients in Wonkwang University Hospital in 2000. Antimicrobial susceptibility was tested by NCCLS disk diffusion test and agar dilution test. MRSA and A. baumannii from ICU patients were isolated from 66.7% and 25% of specimens, respectively. Among the 24 ICU patients, 6 A. baumannii isolates were resistant to imipenem by agar dilution test. The MIC range of imipenem for imipenem-resistant A. baumannii was 16-64 μg/ml. Resistance rate of imipenem-resistant A. baumannii to other antibiotics were higher than that of imipenem-susceptible isolates.
김상윤(Sang-Yoon Kim),박보규(Bo-Gyu Park),정재옥(Jae-Ok Jung),조규상(Kyu-Sang Cho),정일섭(Ilsup Chung) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
Among the components of rotary hooks, a core component of an embroidery sewing system, a study was conducted to apply metal injection molding to the manufacture of a hook body and a housing that was very difficult to mechanical working. The correlation of feedstock, a mixture of binder and SCM 415 metal powder, and properties of the pressure-volume-temperature interrelationship, viscosity, specific heat, and thermal conductivity were measured. Injection molds for the hook body and the housing were developed through injection molding analysis using these properties and conducted injection tests. Optimal injection gate position and number, injection pressure, and injection time were obtained through a comparison of analysis results with the experiment results.