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      • KCI등재

        직장인의 심리적 특성과 창업준비가 창업기회인식과 창업의도에 미치는 영향

        김명한,하규수 한국콘텐츠학회 2022 한국콘텐츠학회논문지 Vol.22 No.9

        In this study, effects of the psychological characteristics of office workers and start-up preparation on entrepreneurship intention by mediating entrepreneurial opportunity recognition were analyzed. As sub-variables of psychological characteristics, desire for economic achievement, self-fulfillment, and risk-taking tendencies were classified. The collected 357 questionnaires, SPSS v24.0 and Process macro 3.5 were used for empirical analysis. As a result, first, it was showed that self-fulfillment and start-up preparation had a positive (+) effect on entrepreneurial intention, and the effect of desire for economic achievement and risk-taking tendencies on entrepreneurial intention was not significant. Second, it was confirmed that psychological characteristics and start-up preparation had a significant positive (+) effect on the entrepreneurial opportunity recognition. Third, it was found that the effect of the entrepreneurial opportunity recognition on the entrepreneurial intention was significant in the positive (+) direction. Fourth, entrepreneurial opportunity recognition was tested as mediating the psychological characteristics of workers, start-up preparation and entrepreneurial intention. As a follow-up study, it is recommended that studies to analyze moderated mediating effects by the conditional process model including moderating variables and to discover the third mediator other than a mediator used in the research should be conducted. 본 연구에서는 직장인을 대상으로 직장인의 심리적 특성과 창업준비가 창업기회인식을 매개하여 창업의도에 미치는 영향을 분석하였다. 심리적 특성의 하위변수로는 경제적성취욕구, 자아성취 및 위험감수성향으로 구분하였다. 수집된 설문지 357부와 SPSS v24.0과 Process macro 3.5를 실증분석에 사용하였다. 분석결과는 첫째, 자아성취와 창업준비는 창업의도에 정(+)의 방향으로 영향을 미치는 것으로 나타났고 경제적성취욕구와 위험감수성향은 창업의도에 영향을 미치지 않는 것으로 나타났다. 둘째, 심리적 특성과 창업준비는 창업기회인식에 유의한 정(+)의 영향을 미치는 것으로 확인되었다. 셋째, 창업기회인식이 창업의도에 미치는 영향은 정(+)의 방향으로 유의한 것으로 나타났다. 넷째, 창업기회인식은 직장인의 심리적 특성, 창업준비와 창업의도 간을 매개하는 것으로 검정되었다. 후속 연구로는 조절변수가 포함된 조건부과정 모형으로 조절된 매개효과 분석이나 연구에서 사용된 창업기회인식 외에 제3의 매개변의 발굴을 위한 연구가 필요할 것으로 권장된다.

      • 부분응고법에 의한 알루미늄의 고순도화에 관한 연구

        김명한,천현태 충북대학교 산업과학기술연구소 1991 산업과학기술연구 논문집 Vol.5 No.2

        This study was investigated on the re-use feasibility of the waste ammonium carbonate solution produced in a commercial AUC (Ammonium Uranyl Carbonate) conversion plant. As powder characteristics, mean particle size of AUC powder was decreased and agglomerates were much occured in case of using the waste AC solution than that of the gases, but other properties such as particle she distribution and shape of particles are thought to be similarly. In compaction of UO₂ powder, the breaking pressure of agglomerated UO₂ powder with waste AC solution has lower than that case of gases production, respectively. But, final sintered pellet density of UO₂ powder was 10.52 g/cc, and these values could be used in nuclear fuel powder fabrication process. So the waste AC solution which is produced in commercial AUC conversion plant, is possible to recycle.

      • KCI등재

        트러스웹을 가진 보의 허용하중 산정

        김명한,Kim,Myeong-Han 한국방재학회 2010 한국방재학회논문집 Vol.10 No.2

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        The efficient beam members for modern greenhouse need to be much lightweight with the required flexural and buckling strength. To confirm the applicability and practicality of the trussed web beam recently proposed for column and beam members of greenhouse, the flexural behavior and buckling characteristics were analyzed by the finite element approach. On the basis of analytical studies, the member design process was presented considering the lateral and local buckling behavior. Also, two improved alternatives which were capable of retaining the lateral and local buckling effectively were suggested. 유리온실에 효과적으로 적용할 수 있는 보는 최대한 가벼운 중량을 유지하면서, 요구되는 휨모멘트 강도와 좌굴 강도를 만족시켜야 한다. 이 연구에서는 유리온실의 보 및 기둥 부재로 최근에 제안된 트러스웹을 가진 보의 실무적인 적용성을 확립하기 위해서 휨거동과 좌굴거동을 해석적으로 분석하였다. 이 결과를 바탕으로 횡좌굴 및 국부좌굴을 고려한 부재설계 프로세스를 제시하였다. 또한 유한요소 해석결과를 바탕으로 횡좌굴 혹은 국부좌굴을 지연시킴으로서 단면성능을 향상시킬 수 있는 개선안을 제시하였다.

      • KCI등재

        새로운 접합상세를 가진 단층 래티스 돔의 비탄성 거동에 관한 실험연구

        김명한,오명호,정승열,김상대 한국강구조학회 2009 韓國鋼構造學會 論文集 Vol.21 No.2

        This study discusses the inelastic behavior of single-layer latticed dome, which consists of a tubular truss member and newly proposed joint sections, through a loading test on a scaled-down structure. The loading test was performed under displacement control conditions, using loading transfer system for the same value of point loads on all joints. The maximum applied load was nearly 1.6 times of the design load, and structural failure occurred after exceeding the compressive yielding in some members. Structural displacement was maintained up to the limit of the oil jack. The behavior of the latticed dome from the loading test was analyzed according to the order of loading steps. 이 논문에서는 새롭게 제안된 접합부를 적용한 단층 래티스 돔의 비탄성 거동에 대해 실험적으로 분석하였다. 구조적인 성능과 시공 성을 모두 만족시키기 위해서 제안된 새로운 접합부를 적용하여 강관으로 구성된 스팬 7m의 단층 래티스 돔의 축소실험모델을 제작하였으며, 각 절점에 균일한 하중이 가력되도록 하중전이장치를 이용하여 정적재하실험을 수행하였다. 최대가력하중은 1,114kN이었고, 일부 접합부의 항복 이 후에 강관부재의 좌굴이 발생하였다. 강관부재의 좌굴발생 이후에는 가력장치가 허용할 수 있는 변위까지 실험을 수행하였으며, 실험을 통해서 구 해진 단층 래티스 돔의 비탄성거동을 하중 단계별로 분석하였다.

      • KCI등재후보

        Development of the Damping Coefficients for Weak and Moderate Earthquake Ground Motions

        김명한 한국방재학회 2008 한국방재학회논문집 Vol.08 No.05

        Most of seismic design code provisions provide the design response spectra for defining design earthquake ground motions. The design spectra in the code provisions generally come under the 5% of critical damping value, which corresponds to the responses of common structure under the design earthquake. Energy dissipation devices and seismic isolation systems became more popular and the design response spectra at higher damping levels are required. Damping coefficients can be effectively used in conversion of 5%-damped design spectra into other damping levels. These coefficients in the current seismic design code provisions are based on the strong ground motion records. Since the weak and moderate earthquake data have different characteristics from those of strong earthquake data, the application of these coefficients should be investigated in the weak and moderate earthquakes zones. In this study, damping coefficients based on the weak and moderate ground motions were developed and compared to those of current seismic design code provisions. 대부분의 내진설계기준에서는 설계지반운동을 정의하기 위해서 설계스펙트럼을 제시하고 있다. 기준에서 제시되는 설계스펙트럼은 일반적으로 5% 임계감쇠비에 대한 것이며, 이것은 일반적인 건축구조물에 적용할 수 있는 것이다. 에너지 소산장치나 면진 시스템의 적용이 점차 증가하고 있으며, 이러한 장치를 적용한 건축구조물의 내진해석을 위해서는 5% 임계감쇠비를 초과하는 설계스펙트럼이 필요하다. 5% 임계감쇠비에 대한 설계스펙트럼을 다른 임계감쇠비에 대한 설계스펙트럼으로 변환하기 위해서는 감쇠계수가 효과적으로 이용될 수 있다. 현재의 내진설계기준에서 제시하고 있는 감쇠계수는 강진자료를 바탕으로 제시된 것이다. 중진 및 약진은 강진과는 다른 특성을 가지므로, 이러한 감쇠계수가 중진 및 약진 지역에 적용하는 것은 충분한 검토가 필요할 것이다. 이 논문에서는 중진 및 약진자료를 이용한 감쇠계수를 제시하고, 현재 설계기준에서 제시하고 있는 감쇠계수와 비교하였다.

      • KCI등재후보

        The Effects of Sc on the Microstructure and Mechanical Properties of Hypo-Eutectic Al-Si Alloys

        김명한,홍영명,조해용 대한금속·재료학회 2004 METALS AND MATERIALS International Vol.10 No.6

        The eutectic Si microstructure in Al-8.5wt.%Si alloy was changed from large flakes to fine lamellar when the Sc amount in the alloy reached 0.2 wt.%. 0.8wt.%Sc was optimal in terms of attaining the best modification effect. Study on the distribution of the modifiers and measurement of the surface tension of Al-8.5wt.%Si alloy melt with added Sr, Na, and Sc modifiers, respectively, reveals that Sc modifies eutectic Si by a decrease of surface tension, while Sr and Na modify eutectic Si mainly by an impurity-induced twinning mechanism. Al-8.5wt.%Si-0.4wt.%Sc alloy displayed approximately 50 and 70 % increases in tensile strength and elongation, respectively, over Al-8.5wt.%Si alloy in the cast state. It also presented approximately 65 and 70 % increases in tensile strength and elongation, respectively, over Al-8.5wt.%Si alloy at a ppt heat-treated state at 200 oC for 3 h.

      • CIS태양전지 박막내 Na의 균일 첨가기술에 대한 연구

        김명한 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2

        CuInSe2 (CIS) thin films are considered to be the most reasonable materials for high efficiency solar cells owing to their appropriate bandgap, long-term stability, and low-cost production. As the electrodeposition could produce thin films over a large area and easily be scaled up to a commercial process at a lower charge, electrodeposition is highly practical technique for developing CIS-based solar cells. It has been observed that CIS solar cells containing small amounts of Na achieve higher efficiencies compared to those without Na. The most significant effects are (a) increased hole density and film conductivity and (b) suppression of the formation of the ordered defect compound. Other more additional effects were seen such as, improved film morphology, orientation, and grain sizes, increased uniformity of photocurrent and short-circuit current, higher open circuit voltage, and higher fill factors. In the present paper, Na-doped Mo thin films were deposited on soda lime glass at room temperature in order to incorporate Na by using dc magnetron sputtering. Mo thin films were deposited on the Na-doped Mo thin films in the same procedure. CIS precursor films were electrodeposited on Mo/glass substrate in acidic solutions containing Cu2+, In3+ and Se4+ ions at -0.5V(SCE) and pH 1.8. In order to induce recrystallization, the electrodepositied Cu1.00In0.81Se2.08 precursor films were annealed under a high Se gas atmosphere for 30 min at 500℃. The results of these experiments are as follows. The sheet resistance of Mo-Na/Mo bi-layer was outstandingly lower than the back cantact of Mo. According to the increases of the thickness of Mo-Na, the sheet resistance of back contact was increased. The grain size of back contact and the amount of Na in the CIS absorber layer were also increased. In case of depositing only Mo without Na, the grain was uniformed. However, the faceted phases occurred, resulting in rough surface morphology of the CIS films

      • SCOPUSKCI등재

        Meperidine 척추마취후 발생한 하지의 Tonic-Clonic Convulsion

        김명한,전재규,지대림 대한마취과학회 1991 Korean Journal of Anesthesiology Vol.24 No.4

        Recently we encountered consecutive but transient tonic-clonic convulsions and motor weak-ness in the lower limbs of a patient during the recovery from meperidine spinal aneathesia for Cesarean section. The patient revealed no previous history of neurologic disease, and there was no suspicious cause to explain the phenomenon. The episodes of convulsion were suppressed with intravenous diazepam. The mechanisms are vaguely suggested that the spinal inhibitory neurons are inhibited by the local anesthetic effects of spinal meperidine and an effect similar to the convulsive action of intraspinal morphine occurs.

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