줄눈 콘크리트포장의 우각부 하중 해석

심도식,이주형,윤경구 도립 강원전문대학 1998 道立 江原專門大學 論文集 Vol.1 No.1

This study focused on the development of an alternative stress estimation procedure to instantly calculate the critical stresses bonded concrete pavement. Closed form analysis is commonly used to analyze pavement structures. This type of analysis assumes linear elastic material properties and static loading conditions. The well-known ILLI-SLAB finite element program was used for the analysis. Bonded concrete overlay analyzed the stress distribution, behavior and load carrying . capacity under track load is made evaluation standard of bonded concrete overlay. In the study, the following results were derived ; The properties of strength is that compress and 3-point bending strength of existing pavement is deteriorated with 184 ㎏/㎠, 59 kg/㎠ but compress and splitting tensile strength of overlay is satisfied with 465 ㎏/㎠, 45 kg/㎠. Load transfers is happen at adjacent slab by interlocking under track load. The stress distribution under interior, corner and edge load is described high loading position surrounding then loading position.

확률적 페트리네트 기반의 워크플로우 최적화 모델링

임경택,박세권,명광식,김도일 중앙대학교 산업경영연구소 2000 산업경영연구 Vol.9 No.1

워크플로우에서는 기업이 정한 목표를 달성하고, 기업의 현재의 불확실성과 불안정성을 제거하고, 현재의 치열한 경쟁을 극복하고, 장래에 보다 나은 기업이 되기 위해서, 기업의 모든 재 구성원과 자원들 사이에 존재하는 이질적 요소를 조정·조화시킨 후, 유기적으로 결합하여, 조직의 목적을 이루는 것이 중요하다. 본 논문은 크게 두 가지에 초점을 두고 있다. 첫 번째, 프로세스를 최적화시키기 위한 조정 기준을 제시한다. 이 전의 연구들에서는 프로세스를 조정 할때, 대부분 분석가의 직관과 경험에 의존했었다. 그러나, 본 연구에서는 이러한 분석가의 직관과 경험에 의존한 프로세스 조정을 최대한 줄일 수 있는 몇가지 간단하면서도, 강력한, 정량화 된 기준을 제시한다. 두 번째, 워크플로우에, 시간을 소요하는 처리와 하지 않는 처리로 구분 할 수 있으며, 처리 시간을 확률 함수로 파악함으로써 현실세계에 가까운 모델링을 할 수 있는, GSPN(Generalized Stochastic Petri-net)을 적용한 프로세스 모델링 방법을 제시한다. This paper proposes a method to analyze and design for workflow systems called GSWN(Generalized Stochastic Workflow Net), which is based on stochastic Petri-net, and an algorithm for workflow process optimization based on simulation analysis. The proposed modeling method was developed by adding workflow characteristics to stochastic petri-net. The proposed algorithm is consist of 4 major steps such as GSWN step, GSWN to matrix step, block establishing step, and process optimizing step.

상업스포츠 지도자의 운동지원이 운동만족 및 참가지속에 미치는 영향

김경식,이준수 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.2

This study was to analysis the effects of instructors' support on satisfaction and adherence of participation at the commercial sport center. To attain the goal of the study described above paragraphs, some members of commercial sports center held in Seoul were set as a collected group. Then, using the cluster random sampling method, finally drew out and analyzed 441 people in total. The material collection device was the brochure named <the instructors' support, satisfaction and adherence of participation>. The result of reliability check up was here below; over Chronbach' α=.787. To analyze materials, reliability analysis, multiple-regression and path analysis were used as statistic analysis techniques. The conclusion based on above study method and the result of material analysis are here below. First, instructors' support influences on the satisfaction of the participation at the commercial sports center. Second, instructors' support influences on the adherence of the participation at the commercial sports center. Third, the satisfaction influences on the adherence of the participation at the commercial sports center. Fourth, there exists significant casual relationship among instructors' support, satisfaction, and adherence of participation.

직장인의 레저스포츠 몰입경험과 여가만족 및 자아실현의 관계

김경식 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

This study was to analysis the relationship between flow experience of leisure sports participation, leisure satisfaction, and self-actualization among the employee. To attain the goal of the study described above paragraphs, some employee dwelling in Seoul were set as a collected group. Then, using the random sampling method, finally drew out and analyzed 159 members in total. The material collection device was the brochure named <the survey on the leisure sports participation, leisure satisfaction, and self-actualization>. The result of reliability check up was here below; Chronbach' α=.85. To analyze materials, reliability analysis, correlation analysis, SEM were used as statistic analysis techniques. The conclusion based on above study method and the result of material analysis are here below. First, the factor of flow experience of leisure sport participation influences on the leisure sports participation influences on the leisure satisfaction. The more flow experience, the more leisure satisfaction. Second, the factor of flow experience of leisure sports participation don't influences on the self-actualization. Third, the factor of leisure satisfaction influences on the self-actualization. The more leisure satisfaction, the more self-actualization.

망간페라이트 나노 분말의 수계분산거동 및 특성

배동식,김은정,한경섭 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

Dispersion stability of nanosized MnFe₂O₄ powders which was produced by glycothermal process were studied in aqueous suspension using ESA(Eletrokinetic Sonic Amplitude). The average particle size of the synthesized MnFe₂O₄was about 30±10nm. The dispersion and rheological behavior of MnFe₂O₄nanoparticles aqueous suspension was investigated using MnFe₂O₄as a disperse agent. The colloidal stability of nanosized MnFe₂O₄aqueous suspensions at different pH values has been investigated by means of zeta potential, sedimentation, average particle size and microstructure of green body. The isoelectric point of MnFe₂O₄powders is at pH around 5.5 and the value of zeta potential is at its maximum near pH 11.

SM20C의 ENCLOSED WELDING과 AC ARC WELDING의 피로한도 특성비교

김경식,이종형 國立金烏工科大學校附設生産技術硏究所 1996 産業技術開發硏究 Vol.12 No.-

It has been generally accepted that welding has several advantages to other mechanical joints welding parts, however, are liable to cracks and inhomogeniety of the structure. In this study the fatigue limits of the enclosed welding and AC are welding are compared. The result can be summarized as follows. The fatigue limit of enclosed welding is higher than that of AC are welding. Enclosed welding shows less distortion of angle. Residual stress is decreased with more repeated cycles in both cases.

FPGA식 구현을 위한 HDTV 인터폴레이터 연구

문경태,문도성,신병식 서울産業大學校 1995 논문집 Vol.41 No.1

This paper propose the design and implementation of interpolation filter which interpolate subsampled data with the FPGA in HD-MAC decoder. Interpolation filter is FMH(FIR-Medain Hybrid) filter, hybrid filter composed of linear and nonliner filter, which has characteristics of good conservation of edge and good restoration of fine lines and robust to noise. Interpolator is implemented with FPGA of Actel company. It is proved that interpolator is well operated at 27MHz.

Economic Lot Range 分析에 관한 硏究

강경식,나승훈 명지대학교 공학기술연구소 1991 공학기술연구소 논문집 Vol.6 No.-

This paper present how to analyze and determine the Econcmic Lot Range (ELR) using mathematical approach. The ELR is determined by the two limits of lot size which is upper limit and lower limit. The range is wide enough to provide a great flexibility in management decision. A functional relationship between total cost and lot size is estabilished through the use of sensitivity analysis.

유사성 계수에 관한 연구

강경식,오영수,나승훈,김태호 명지대학교 공학기술연구소 1992 공학기술연구소 논문집 Vol.7 No.-

본 논문은 재공품 재고를 줄이기 위한 방법으로서 유사성 계수법의 도입에 관하여 서술하였다. 특히 J.R.King의 이론과 Nakornchai의 ROC-2 이론을 비교 하였다. 그 결과로서 ROC-2의 이론은 적은 기계 혹은 부품에서와 같은 시스템에 사용하는 것이 유리하며 또한 기계나 부품의 그룹화가 서로 독립적으로 수렴되지 않아도 된다는 장점이 있다. This paper reprented that work-in-process inventory has been decreased with the application of the similarity coefficient algorithm. Especially, J.R.King's ROC and Nakornchal's ROC-2 algorithm is studied. The analyzed resuits in this paper are as ROC and ROC-2 algorithm have an adventage that it can be used in production system which has many machinary and component and an arbitrary threshold value should be define and many grouping are being performed independently.

공구형상이 칩유동에 미치는 영향에 관한 연구

김경우,김우순,윤주식,채왕석,김동현 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-

A new methodology is presented to evaluate material properties at high strain rates and high temperatures based on orthogonal metal cutting experiments and FEM simulations. Average strain rate and average temperature found in the deformation zone are computed and flow stress data at these conditions are modified until cutting forces calculated in simulations match those determined in experiments. Material properties obtained from this method were verified by additional metal cutting simulations. Derivation from cutting forces measured in experiments was less than 10%. The feasibility of tool design using FEM simulations is also demonstrated.