본 연구는 기업가적 지향성, 제품혁신, 비즈니스프로세스혁신(이하 BP혁신), 기업성과 간의 관계를 규명한다. 기업가적 지향성과 기업성과의 관계에 대한 학술적 이해를 심화하기 위해 기존에 충분히 연구되지 않았던 제품혁신과 BP혁신의 매개효과를 분석한다. 실증분석을 위해 ‘2020년 한국기업혁신조사: 제조업’의 원자료에서 결측치를 제외한 3,982 개의 기업의 응답 데이터를 사용하였으며 구조방정식 모형을 활용하여 가설을 검증하였다. 실증분석 결과, 기업가적 지향성, 제품혁신, BP혁신은 기업성과에 긍정적인 영향을 미치는 것으로 나타났다. 또한, BP혁신은 제품혁신에 긍정적 영향을 미치는 것으로 나타났다. 기업 가적 지향성과 기업성과의 관계에서 제품혁신과 BP혁신의 긍정적 매개효과가 확인되었으며 BP혁신이 제품혁신의 경로를 거치는 순차적 매개효과를 보였다. 본 연구는 제품혁신과 BP혁신의 매개효과를 통해 기업가적 지향성과 기업성과의 관계에 대한 이해를 심화하였다는 점에서 학술적 의의가 있다. 기업가적 지향성이 기업성과에 긍정적 영향을 주기 위해 BP혁신과 제품혁신이 유기적으로 연계되어야 한다는 점에서 실무적 시사 점이 있다.

This research introduces a novel probabilistic approach to consider the effects of uncertainty parameters during the design and construction process, providing a fresh perspective on the evaluation of the structural performance of reinforced concrete structures. The study, which categorized various random design and construction process variables into three groups, selected a two-story reinforced concrete frame as a prototype and evaluated it using a nonlinear analytical model. The effects of the uncertainty propagations to seismic responses of the prototype RC frame were probabilistically evaluated using non-linear dynamic analyses based on the Monte-Carlo simulation sampling with the Latin hypercube method. The derivation of seismic fragility curves of the RC frame from the probabilistic distributions as the results of uncertainty-propagation and the verification of whether the RC frame can meet the seismic performance objective from a probabilistic point of view represent a novel and significant contribution to the field of structural engineering.

세라믹 분리막은 높은 열적, 화학적 안정성을 갖기 때문에 극한의 조건에서 운전되는 다양한 산업 공정에 적용할 수 있다. 그러나 투과도와 기계적 강도의 trade-off 현상에 의한 세라믹 분리막 활용에 제약이 있어, 고투과성-고강도 분리막 의 개발이 필요하다. 본 연구에서는 상전이-압출법으로 알루미나 중공사 분리막을 제조하고, 고분자 바인더의 종류와 그 혼합 비에 따른 분리막의 특성 변화를 관찰하였다. 용매인 DMAc (Dimethylacetamide)와 고분자 바인더의 한센 용해도 인자를 비 교하면, PSf (polysulfone)가 DMAc와 높은 용해도 특성을 갖기 때문에 도프 용액의 점도와 토출압력이 높게 나타나 분리막 내부가 치밀한 구조로 형성되기 때문에 높은 기계적 강도를 갖으나 수투과도가 감소하는 것으로 확인되었다. 그에 반해, PES (polyethersulfone)를 이용하여 분리막을 제조하면 기계적 강도가 다소 감소하고 수투과도가 증가하는 것으로 나타났다. 따라 서 분리막 성능과 물성을 최적화하기 위해 PSf와 PES를 혼합하여 분리막을 제조하였으며, 9:1로 혼합하여 제조된 분리막에 서 최적화된 수투과도와 기계적 강도를 얻을 수 있었다.

This study was conducted to evaluate the filtration performance according to the feed temperature composed of NaCl and the operating pressure of the brackish water reverse osmosis (BWRO) process. The temperature is known that decides the filtration performance of reverse osmosis (RO). It is noted that temperature increase activates the permeate of salts due to augment of diffusivity and mass transfer. Filtration of the lab-scale RO system was performed with constant pressure and the constant flow was simulated. The salt rejection measured by the concentration of the feed and permeate was compared with water permeability and salt permeability in the conditions containing various temperatures (5, 10, 15, 20, 25, and 30℃) and pressures (10, 12, 15, and 18 bar). An increase in feed temperature from 5 °C to 30 °C caused a 4.65% decrease in salt rejection in CSM, due to an increase in salt permeability (4.06 times) rather than an increase in water permeability (2.62 times). Specific energy consumption (SEC) was calculated by using an electricity meter set in the RO system. It was expected that the SEC by the increases in temperature and pressure decreased due to the viscosity decline of the feed and the permeate flux augment, respectively. The SEC decreased by 63.4% in CSM and by 54.3% in Nittodenko when the feed temperature increased from 5 °C to 30 °C. It discussed how to operate the optimal RO process through the effect of temperature and operating pressure and the comparison of SEC.

The utilization of carbonaceous reinforcement-based polymer matrix composites in structural applications has become a hot topic in composite research. Although conventional carbon fiber-reinforced polymer composites (CFRPs) have revolutionized the composite industry by offering unparalleled features, they are often plagued with a weak interface and lack of toughness. However, the promising aspects of carbon fiber-based fiber hybrid composites and hierarchical composites can compensate for these setbacks. This review provides a meticulous landscape and recent progress of polymer matrixbased different carbonaceous (carbon fiber, carbon nanotube, graphene, and nanodiamond) fillers reinforced composites’ mechanical properties. First, the mechanical performance of neat CFRP was exhaustively analyzed, attributing parameters were listed down, and CFRPs’ mechanical performance barriers were clearly outlined. Here, short carbon fiber-reinforced thermoplastic composite was distinguished as a prospective material. Second, the strategic advantages of fiber hybrid composites over conventional CFRP were elucidated. Third, the mechanical performance of hierarchical composites based on carbon nanotube (1D), graphene (2D) and nanodiamond (0D) was expounded and evaluated against neat CFRP. Fourth, the review comprehensively discussed different fabrication methods, categorized them according to performance and suggested potential future directions. From here, the review sorted out three-dimensional printing (3DP) as the most futuristic fabrication method and thoroughly delivered its pros and cons in the context of the aforementioned carbonaceous materials. To conclude, the structural applications, current challenges and future prospects pertinent to these carbonaceous fillers reinforced composite materials were elaborated.

In this study, the removal efficiency of PFCs(perfluorinated compounds) in the GAC(granule activated carbon) process based on the superheated steam automatic regeneration system was investigated in laboratory scale and pilot-scale reactor. Among PFCs, PFHxS(perfluorohexyl sulfonate) was most effectively removed. The removal efficiency of PFCs was found to be closely related to the EBCT, and the removal efficiencies of PFOA(perfluorooctanoic acid), PFOS(perfluorooctyl sulfonate), and PFHxS were 43.7, 75, and 100%, respectively, under the condition of EBCT of 6 min. Afterward, PFOA, PFOS, and PFHxS exhibited the earlier breakthrough time in the order. After that, GAC was regenerated, and the removal efficiency of the PFCs before and after regeneration was compared. As a result, it was shown that the PFCs removal efficiency in the regenerated GAC process were higher, and that of PFOA was improved to 75%. The findings of this study indicate the feasibility of the superheated steam automatic regeneration system for the stable removal of the PFCs, and it was verified that this technology can be applied stably enough even in field conditions.

In this paper, a heat exchange system using cooling dehumidification and mixing process was proposed as an experimental study for a white smoke reduction heat exchanger system under winter condition. The white smoke reduction heat exchange system is divided into an EA part, SA part, W part and mixing zone. For the operating conditions, three types (Cases 1, 2, and 3) were selected depending on whether EA fan, SA fan, and A-W heat exchanger were operated. In addition, in order to visualize the white smoke exhausted from the mixing zone, it was photographed using CCTV. In order to investigate the performance of the white smoke reduction heat exchange system, the temperature reduction rate and absolute humidity reduction rate of EA and the heat recovery rate of W were calculated. The temperature change of EA and SA according to operating conditions was most effective in Case 3, and the temperature and absolute humidity at the outlet of the mixing zone were greatly reduced. From the results of the white smoke visualization, it was confirmed that the white smoke generation mechanism was different depending on the operating conditions, and the amount of white smoke generation was greatly reduced.

본 논문은 창작 뮤지컬 공연 제작과정에서 음악감독이 관여하는 음악작업에 대하여 연구하 였다. 연구의 목적은 뮤지컬 음악감독이 담당하는 뮤지컬 넘버의 공연화에 대하여 뮤지컬 제 작 현장의 직접적인 사례를 통하여 음악감독의 작업을 파악하는데 있다. 기존의 음악감독에 관한 연구들은 음악감독 사례 인터뷰의 간접적인 리뷰가 중심이었다면, 본 연구는 음악감독의 업무 중에서도 뮤지컬 넘버의 공연화인 루티닝(Routining) 과정에 대하여 음악감독의 관점에 서 직접적으로 서술한 연구이다. 본 연구자는 선행연구를 통해 음악 변화과정인 루티닝 대한 이론적 근거를 분석하고, 음악감독이 수행하는 작업 영역을 창작 뮤지컬 <해방>의 제작과정 사례에 적용하여 고찰하였다. 연구 결과 음악감독은 뮤지컬 넘버의 구성과 배치를 파악하여 드라마의 흐름과 무대전환을 위한 연결 및 가사 표현과 발음의 전달 등을 고려하여 음악을 조 정하는 작업을 하고, 배우들의 넘버습득을 위한 보컬지도와 넘버의 Key 조정 및 화음 추가 등 보컬 편곡을 담당한다. 본 연구를 통해 창작 뮤지컬 제작에서 무형의 악보가 유형의 공연으로 변화되는 과정을 이해하고, 그 과정의 중심에 있는 음악감독 역할에 대한 연구에 도움이 되길 바란다.