말초신경 손상이 실험적으로 유발된 흰쥐의 척수신경절 및 척수등쪽뿔내 신경세포의형태학적 변화에 관한 연구

이원택,손민균,정경승,이홍석,박경아 대한해부학회 1997 Anatomy & Cell Biology Vol.30 No.5

일정축력 및 반복 횡하중을 받는 철골철근콘크리트 기둥의 내력과 변형성능

정수영,연길환,임경택,윤석천,한병찬 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

An experimental investigation was conducted to investigate the strength and deformation capacity of Wide Flange Steel Encased Reinforced Concrete(SRC) Columns subjected to constant axial compression and cyclic lateral loading conditions. Six one-third scale specimens were tested, each consisting of a structural steel size encased in reinforced concrete. The parameters studied in the test program included the effects of B/t ratios of encased steel(=13, 18, 23), ratios of axial force(=1/3, 1/6). As a result, capacity prediction based on superimposing the moment-axial-load interaction surfaces of the steel shape and reinforced concrete produced good results; the average of the experimental-to-predicted capacity ratio being equal to 0.99∼1.20. The observed hysteretic behavior of the test specimens indicated that adequated ductility can be achieved and the concrete core must be inhibited to buckling of wide flange.

음악적 재능과 성격적 특징

정진우,박제경,염택구 최신의학사 1973 最新醫學 Vol.16 No.1

QoS를 보장하기 위한 DiffServ-MPLS 연동 기법

정경택,한철민,김남희,정동수 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

In an IP network, various types of traffics are statistically multiplexed to utilize efficiently the network resources.The DiffServ-MPLS supports a wide variety of communication services with different QoS requirements. The DiffServ-MPLS based on QoS architecture had become one of the most promising ways to guarantee QoS Multi-service IP network. But how to manage IP network with QoS guarantee is still an open issue. In this paper, we propose DiffServ-MPLS buffer management technique using the specified policing, queuing, and scheduling.

다단 상호연결 네트워크의 계층구조 모델과 성능근사해석

정경택 群山大學校 1990 論文集 Vol.17 No.-

We approximately analyze the performance of the MIN's for interconnecting N processors or N processors to N commonly shared memory modules in a multiprocessor system. The performance of the MIN's with respect to their memory bandwidth is approximately analyzed and is compared to that of a crossbar under the hierarchical model. It shown that for a higher rate of favorite requests the delta networks perform close to a crossbar.

해외직접투자기업의 환경대응 전략 유형에 관한 연구

정경택 동국대학교 경제경영연구원 1997 經濟經營硏究 Vol.21 No.1

우리나라 중소기업의 국제화 추진전략에 대한 연구

鄭京澤 동국대학교 경영관리연구소 1993 經營經濟論叢 Vol.17 No.-

Intensification of import restriction imposed by advanced countries based on protectionism, pressures to open domestic markets, and shortened product life cycle prusuant to accelerated technology innovation, demannd strengthening of international competitiveness through technology and quality rather than through prices which have hitherto been export foundation for Korean enterprises. Such environmental changes are expected to seriously affect enterprises regardless of business sizes, requiring small-medium enterprises, in particular, to flexibly cope with environmental changes : and further require managers of small-medium exterprises to intentionally maintain strategic ideas in order to realize structural improvement and growth. Small-medium enterprises of Korea, however, are too restricted structurally, in terms of human and material resources, to effectively compete under these environmental changes, and it is expected that management of small-medium enterprises will face intensified difficulities. Furthermore, the recent world economic environment changes are too serious for small-medium enterprises of Korea to simply have an easy attitude of waiting for epoch-making economic policies to be established by Government. Accordingly, these studies attempt to discuss directions the small-medium companies of Korea should take under such changes of world economic order, and right directions and courses for Korean economy to take to satisfy the requirements of globalization. In other words, this research seeks to examine the necessity for Korean small-medium enterprises to pursue globalization strategies, and at the same time, analyze actual situation and problems currently facing Korean small-medium enterprises to determine desirable globalization sterategies small-medium enterprises should take. The scope of this studies, therefore, are concentrated on small-medium enterprises which occupy considerable weight in Korean economy rather than on large business groups, with an aim to discuss the subjects of globalization, and strategic management for small-medium enterrises. These studies offer a general definition on globalization through literature examination, based on which subject areas of globalization for Korean small-medium enterprises are to be determined. In addition, this research presents the necessity for Korean small-medium enterprises to pursue globalization strategies with respect to internal and external effect of national economy. Through status analysis carried out for entire small-medium enterprises, degree of globalization effected in the past by Korean small-medium enterprises will be examined; and, in addition, conceptional frame aimed at analyzing current situation facing small-medium enterprises will be developed through the use of international competitiveness appraisal model, and problems facing small-medium enterprises with respect to human and material resources brought to surface. In conclusion, this research attempted to develope globalization strategy model of Korean small-medium enterprises based on problems analyzed, and present, though this model, desirable globalization strategies that small-medium enterprises should pursue. In addition, in order to effectively analyze literatures and materials tobe used for these studies, domestic and foreign books and literatures, and secondary materials related to small-medium enterprises, will be utilized widely.

초내식성 스테인리스강 선재와 브라켓의 내식성 및 금속 이온 용출 특성

오근택,정경진,황충주,박용수,김경남 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.4

Metallic orthodontic appliances are known to release metal ions in an oral cavity. It is not advisable that toxic corrosion products derived from the appliances is absorbed into the body. Metal ions release from orthodontic appliances is known to have large effects on the result of orthodontic treatment and systemic health. Metal bracket and wire were made of super stainless steel(S32050) with high corrosion resistance. The corrosion resistance and ion release property of S32050 and conventionally used appliances were examined. Four types of wire were ligated in either super stainless steel(SB) or Tomy bracket(TB) with O-ring, and then each group was immersed in an artificial saliva at 37℃ for 12 weeks. Amount of released metal ions was measured with immersion time by graphite furnace atomic absorption spectroscopy and surface morphology was investigated. S32050 showed the low passive current density of about 1 μA/㎠ and the stable passive region to a high potential in artificial saliva. S32050 appliances did hardly release nickel ions in artificial saliva. S32050 wire(SRW) and NiTi wire(NW) didn't show significant difference of Ni ion release with immersion time, meanwhile, Remanium wire(RW) showed significant difference in 12 weeks. Ni ion releasce from the brackets didn't show any significant difference with immersion time and between SB and TB. Amounts of Ni ion released from TB-SRW showed significant difference in 12 weeks, those from TB-RW showed significant difference from 4 weeks later and highest release among all groupsin12weeks. TB-NW released little Ni ion for all immersion time and showed significant difference from 4 weeks later, TB-TW(TMA wire) showed significant difference in 12 weks. SB-SRW didn't show any significant difference and SB-RW signigicant difference in 12 weeks,but lower compared with TB group. SB-NW and SB-TW didn't show any significant difference. Corrosion products didn't be observed in mostly groups during the immersion time, except that in TB-RW, they were observed on the bracket surface between O-ring and wire from 8 weeks later. Super stainless steel wire had good corrosion resistance compared with stainless steel wire, and it is believed that it can be used as orthodontic material for bracket and wire.

전단보강근이 없는 재생골재 철근콘크리트보의 전단성능

임경택,정수영 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1

Experimental investigation was conducted to study the shear capacity of recycled aggregate concrete beams without shear reinforcement. The primer objective of the study was t investigate the suitability of using recycled aggregate concrete beams. In designing the specimens, shear-span/depth ratio and aggregate consideration(washed or non-washed aggregate) were chosen as main parameters. As a result, this study, to know the shear capacity of recycled aggregate concrete beams with the main variables such as shear span ratio and weather the recycled aggregate was washed or not, following conclusions come out. 1.In the 3-point flexural strength examine certain comparison of flexural strength between natural and recycled aggregate concrete wasn't come out, because it is failure specimen with early flexural crack simultaneously. 2.Shear strength of recycled-aggregate concrete beam under shear span ratio a/d=3 was higher than ACI(318-95) Code, but lower over a/d =4. 3.Ultimate shear strength of recycled aggregate concrete beam was higher than ACI(318-95) Code and it was very high on shear span ratio a/d =2.

난소암 환자 복수내의 면역복합체로부터 새로운 암관련항원 존재 확인

노만택,박장환,정용훈,김정목,김경태,조양자 한양대학교 의과대학 1993 한양의대 학술지 Vol.13 No.2

Immune complexes were isolated from ascitic fluid of patients with ovarian carcinoma by using protein-A Sepharose CL-4B affinity chromatography, and antigen-antibody complexes then dissociated by ion exchange chromatography in the presence of 8M urea. Only one antigen fraction was obtained by the ion exchange chromatography, but three antigenic bands were demonstrated by SDS-PAGE. The molecular weights of the three protein bands were 70, 41, and 38 kDa, respectively. Of the three proteins the 38 kDa band has already been known, but 70 and 41 kDa bands seems to represent new ovarian tumorassociated antigens. This study may suggest the involvement of multiple antigens in ovarial tumor which can be included in producing tumor-directed monoclonal antibodies