Exploring earth-abundant, highly effective and stable electrocatalysts for electrochemical water splitting is urgent and essential to the development of hydrogen (H2) energy technology. Iron-cobalt layered double hydroxide (FeCo-LDH) has been widely used as an electrocatalystfor OER due to its facile synthesis, tunable components, and low cost. However, LDH synthesized by the traditional hydrothermal method tends to easily agglomerate, resulting in an unstable structure that can change or dissolve in an alkaline solution. Therefore, studying the real active phase is highly significant in the design of electrochemical electrode materials. Here, metal-organic frameworks (MOFs) are used as template precursors to derive FeCo-LDH from different iron sources. Iron salts with different anions have a significant impact on the morphology and charge transfer properties of the resulting materials. FeCo-LDH synthesized from iron sulfate solution (FeCo-LDH-SO4) exhibits a hybrid structure of nanosheets and nanowires, quite different from other electrocatalysts that were synthesized from iron chloride and iron nitrate solutions. The final FeCo-LDH-SO4 had an overpotential of 247 mV with a low Tafel-slope of 60.6 mV dec-1 at a current density of 10 mA cm-2 and delivered a long-term stability of 40 h for the OER. This work provides an innovative and feasible strategy to construct efficient electrocatalysts.

The emergence of Mo2C- based catalysts in recent years has been favored as promising contender within diverse class MXenes. In terms of rapid development in the photocatalytic application, these intriguing compounds exhibit excellent photocatalytic performance because of their superior optical properties and peculiar structure characteristics. Unfortunately, a systematic review of Mo2C- based catalysts is lacking. In this review, we abstract the implication of structure—property relationship of emerging Mo2C- based MXenes materials and their applications toward the photocatalytic hydrogen evolution reaction (HER). Furthermore, synthetic pathways to prepare high-quality, low cost Mo2C- based MXenes materials and their outcomes for high HER applications are systematically described. Finally, several insights are provided into the prospects and future challenges for the development of highly reactive Mo2C- based MXenes materials, which present large range opportunities in this promising 2D materials for green and clean energy in environmental fields. This review provides a comprehensive scientific guide to the preparation, modification, and photocatalytic HER of MXenes-based materials.

Amorphous molybdenum sulfide ( MoSx) has been regarded as a promising hydrogen evolution reaction (HER) catalyst due to its mild preparation conditions and low-cost precursor materials. In this work, we report a simple strategy combining the growth of amorphous MoSx on the surface of metal organic frameworks (ZIF-67) and annealing treatment to prepare Co-doped MoSx nanopolyhedrons (denoted as CoMoSx NPs). The CoMoSx NPs exhibit excellent HER activity in acid condition with an overpotential of 188 mV at a current density of 10 mA cm− 2 (η10), and a relatively stable overpotential after 2000 cyclic voltammetry (CV) cycles testing. The excellent HER performance of the CoMoSx NPs can be attributed to the doping of Co element adjust the electronic structure and increase the conductivity of catalyst, and the nanopolyhedrons structure which can expose more active sites for HER electrocatalytic. This study offers a low-cost and simple strategy to prepare high-activity HER catalyst, which holds great promises in developing advanced electrocatalysts for energy storage.

In this paper, the conceptual spaces of the diachronic semantic evolution of “Paste” semantic verbs are constructed through the diachronic literature surveys. In the history of Chinese language, the verb with the meaning of “Paste” was rarely used in literature before the Tang Dynasty, and it was not until the modern Chinese period that it gradually increased. In terms of activity, from the dominance of “膠” in ancient Chinese to the emergence of “貼” in medieval Chinese, and until modern Chinese, a situation where the three words “貼” “糊” and “粘 (黏)” went hand in hand was formed. The pattern of “粘” “帖”, and “膠” as marginal members greatly influenced the use of “Paste” semantic verbs in modern Chinese, and this pattern was generally continued in modern Chinese, At the same time, there are some differences in the use of words between WeiJin Dynasty

본 논문은 지난 세기 초부터 시작된 기술혁신이론의 진화를 분석한다. 기술혁신 이론은 지난 세기 초 Joseph Schumpeter에 의해 시작되었으나 그의 이론은 주류경제학에 밀려 큰 각광을 받지 못하였다. 1960년대에 들어서 일부 신고전학파 경제학자들이 기술혁신이 경제발전에 미치는 영향을 분석하였다. 1970년대 초 사회경제의 발전에 있어서 기술혁신과 기업가 정신을 강조한 슘페터의 이론이 새로운 조명을 받았고, 이 시기 그의 이론을 추종하는 학자들을 ‘신슘페터주의자라’고 부른다. 이들은 1980년대에 들어 기술혁신의 창출, 활용, 확산에 있어서 한 국가 혁신자원의 총동원체제인 ‘국가혁신체제’의 개념을 창출하였고 이 개념은 빠르게 확산되어 실제로 전 세계적으로 혁신체제에 관한 많은 실증적 연구가 진행되었다. 2000년대 들어 유럽의 학자들을 중심으로 혁신체제의 지속가능한 체제로의 전환에 주안점을 두는 ‘전환이론’이 활발하게 진행되어 오고 있다. 그러나 우리나라는 이에 관한 연구가 부족 하다는 점에서 이 새로운 기술혁신연구의 활성화가 매우 필요하다.

한국 혁신 생태계는 후발 추격자에서 ‘민간 주도의 건강하고 역동적인 생태계 조성을 위한 정부의 역할이 중요한’ 창조적 선도자 단계로 진화해 왔다. 한국의 혁신 생태계는 그동안의 획기적인 발전과 양적 확대에도 불구하고 혁신 성과의 정체 현상, 생태계 내 및 글로벌 연계 활동의 부족 등을 보여주고 있다. 미래 지향적인 혁신 생태계 조성을 위한 차세대 혁신 생태계 모델이 요구되는 상황이다. 기존의 이론적 근거를 바탕으로 혁신 생태계의 바탕을 이루는 것이 기업간 네트워크라는 관점에서 차세대 혁신 생태계의 요소로 기업간 네트워크 외에, 기업 역량, 공공 연구기관, 민간 산업단체, 기술 인프라, 정책 주체를 바탕으로 5개 요소를 설정하고, 불연속적 기술 및 시장 변화에 부응하는 ‘민간 주도의 건강하고 역동적인’ 혁신 생태계로서의 차세대 혁신 생태계 모델을 제시하였고 혁신 생태계구축 역할을 담당하는 정책 주체의 구체적인 방향을 제시하고, 본 연구의 의의를 제시하였다.

Marketing research in hospitality and tourism has been rising continuously. This study provides a systematic review on marketing research and air transport. It identifies key themes and tracks the changes in scholarly researchers’ perspectives pre and post pandemic. By approaching this review not only from the tourism and air transport perspectives, but also from the marketing perspective, this allows the transfer of theories between disciplines, an added value that provides the basis for a field of research to expand and further evolve. Finally, a conceptual framework and an agenda for future research based on emerging research topics are provided.

The development of heteroatoms doped inorganic nanocrystal-carbon composites (INCCs) has attained a great focus for energy applications (energy production and energy storage). A precise approach to fabricate the INCCs with homogenous distribution of the heteroatoms with an appropriate distribution of metal atoms remains a challenge for material scientists. Herein, we proposed a facile two-step route to synthesize INCC with doping of metal (α-Fe2O3) and non-metals (N, P, O) using hydrogel formed by treating hexachlorocyclotriphosphazene (HCCP) and 3, 4, 5-trihydroxy benzoic acid (Gallic acid). Metal oxide was doped using an extrinsic doping approach by varying its content and non-metallic doping by an intrinsic doping approach. We have fabricated four different samples (INCC-0.5%, INCC-1.0%, INCC-1.5%, and INCC-2.0%), which exhibit the uniform distribution of the N, P, O, and α-Fe2O3 in the carbon architecture. These composite materials were applied as anode material in water oxidation catalysis (WOC); INCC-1.5% electro-catalyst confirmed by cyclic voltammetry (CV) with a noticeable catholic peak 0.85 V vs RHE and maximal current density 1.5 mA.cm−2. It also delivers better methanol tolerance and elongated stability than RuO2; this superior performance was attributed due to the homogenous distribution of the α-Fe2O3 causing in promotion of adsorption of O2 initially and a greater surface area of 1352.8 m2/ g with hierarchical pore size distribution resulting higher rate of ion transportation and mass-flux.

To prevent the release of radionuclides into the biosphere, disposal facilities for radioactive waste should be located to provide isolation from the accessible biosphere for tens of thousands to a million years after closure. During the period of interest, the constantly evolving natural environment and possible geological events of the site can cause disturbances to the containment function of the repository. Thus, for the long-term safety assessment of the repository, the possible long-term change of natural barrier should be considered. Due to the characteristics of radionuclides that transport mainly through the groundwater, understanding the long-term evolution of groundwater flow and geochemical properties is essential to assess the long-term changes in the natural barrier performance. The changes in characteristics of natural rocks and geological structures are one of the main factors that determine the hydrological and geochemical characteristics of the deep underground. In this study, we plan to develop a methodology to estimate these future geological evolutions in order to assess the possibility of hazardous events of the site that can affect hydrological or geochemical properties over the period of interest, and also in order to verify the change in the geological environment is within the safe performance range even after the period of interest. However, it is very unreliable to predict future changes in the natural environment because it is very heterogeneous, complex, and difficult to observe directly. For the preliminary study of the project, we reviewed cases of future evolution prediction researches with regard to the geological environment of disposal site and methods they applied to reduce the uncertainty of the prediction. The results will be used to establish basic data for future studies on the long-term evolution of hydraulic-mechanics performance of natural barrier and long-term evolution of geochemical performance around KURT site. In addition, it can contribute to construct long-term evolution scenario of the geological environment around future URL site.

A methodology is under development to reconstruct and predict the long-term evolution of the natural barrier comprising the site of radioactive waste disposal. The natural barrier must protect the human zone from radionuclides for a long time. So for this, we need to be able to restore the evolution of the bedrock constituting the natural barrier from the past to the present and to predict from the present to the future. A methodology is being studied using surface outcrop, tunnel face of KURT (KAERI Underground Research Tunnel), and drill core at KAERI (Korea Atomic Energy Research Institute). Among them, drill core is an essential material for identifying deep geological properties, which could not be confirmed near the surface when considering the geological condition of the repository in the deep part. In this study, we selected several qualitative and quantitative analyses to construct a deep lithological model from the disposal perspective. These were applied to drill core samples around the KURT. There are the dikes presumed the Cretaceous were intruded by Jurassic granitoids in the study area. Analyzing trace elements of each rock type in the study area classified through geochemical characteristics and microstructure in previous studies made it possible to obtain qualitative information on the petrogenetic process. In addition, synthesizing the quantitative numerical age allows for grasping the evolution of bedrock, including intrusion and cutting relationships. LAICPMS was used for determining the age of zircons in plutonic rocks. The highly reliable 40Ar-39Ar method was selected for volcanic rocks because it can correct the loss of Ar gas and obtain the values of two types of Ar isotopes in a single sample. As a result, it was possible to infer the formation environment of rocks through anomalies in specific trace element content. And according to the numerical ages, it was possible to support the known separated rock type found in previous studies or to present a quantitative precedence relation for unclassified rocks. These methods could be applied to reconstruct the long-term evolution of bedrock within natural barriers.

In the engineered barrier system of deep geological disposal repository, complex physicochemical phenomena occur throughout the entire disposal time, consequently impacting the safety function. The bentonite buffer, a significant component of the engineered barrier system, can be geochemically altered due to the changes in host rock groundwater, temperature, and redox condition. Such changes may have direct or indirect effects on radionuclide migration in case of canister failure. Therefore, a modeling tool that accounts for coupled thermal-hydraulic-mechanical-chemical (THMC) processes is necessary for the safety assessment. To this end, the Korea Atomic Energy Research Institute (KAERI) has developed the APro, a modeling interface for conducting safety assessment of deep geological disposal repository. The APro considers coupled THMC processes that influence radionuclide migration. Here, the solute transport considering thermal and hydraulic processes are calculated using the COMSOL multi-physics, while geochemical reactions are carried out in PHREEQC. The two software are coupled using a sequential non-iterative operator splitting approach, and transport of non-water H, non-water O, and charge were additionally considered to enhance the coupling model stability. Finally, the applicability of APro to simulate long-term geochemical evolution of bentonite was demonstrated through benchmark studies to evaluate the effects of mineral precipitation/dissolution, temperature, redox, and seawater intrusion.

이 연구는 정부의 사회문제 해결형 연구개발사업 진화과정을 통해 사회문제 해결형 R&D 모델이 한국 사회에 자리 잡는 과정을 분석한다. 기업, 과학기술계, 시민사회에도 없었던 사회문제 해결형 R&D 모델이 정부연구개발사업을 통해 형성되고 이 모델에 따라 혁신 활동을 수행하는 조직공동체가 전개되는 과정을 살펴볼 것이다. 이를 위해 새로운 혁신모델인 사회문제 해결형 R&D 모델, 그것을 지원·수행하는 조직공동체, 새 모델을 지원하는 제도가 공진화하는 과정을 분석하는 개념적 틀을 제시한다. 그리고 이 틀을 기반으로 사회문제 해결형 연구개발사업이 진행되면서 새로운 혁신모델이 형성·발전되는 과정을 살펴보고 그 의미를 논의할 것이다. 종합에서는 사회문제 해결형 R&D 모델의 활성화를 위한 과제와 정책 방안을 다룬다.

대학은 끊임없이 새로운 지식을 만들고 기술혁신을 통하여 가치를 생산하는 핵심 기관이다. 본 연구에서는 삼중나선모델(Triple Helix Model)의 변화와 진화를 제시하고자 한다. 이를 위해 선진기술의 습득과 소화, 개선과 추월을 통한 과정에 요구되었던 다양한 인력양성 육성과 정책분석의 질적연구를 활용하였다. 1960년대는 기능공과 기술공 위주로 기능적역량이, 1980년 대와 1990년대는 대학원제도가 정착, 고급 인력양성과 함께 정부주도의 대학-기업연구소와의 Triple Helix Model (THM) 혁신활동에 필요한 기능과 기술역량의 인력양성이 강조되었다. 2000년대는 첨단․신산업에 요구되는 창의적 인재양성으로 진화하였고 대학 중심 THM이 본격적으로 추진되는 연구역량이 요구되었고 2010년 이후 창의와 융합역량의 인력양성 방향 성을 대학스스로 결정하는 큰 변화로 진화하였고, 이에 본 연구에서는 창조와 융합 인력양성의 지속적 수행을 위한 혁신모델로 ‘삼중나선싱크로시나리오모델’을 제시한다. 대학은 자유롭게 문제를 찾아내고 정부는 신기술을 위한 지원과, 개인경험과 기업문제를 하나의 시나리오로 엮어 이를 해결하고자 하는 도전의 장이 되어 끊임없는 혁신을 견인해야 한다.

In actual language corpus, there exists a phenomenon of semantic dislocation between “Du1 (度1)” and “Du2 (度2)”. The sense of “Du1 (度1)” is mainly a noun, but it also has a verb sense of “according to rules”. On the other hand, “Du2 (度2)” is mainly a verb, but it has a noun sense, which is a military term. Based on domain restriction analysis, this paper analyzes the syntactic position, semantic evolution and domain restriction changes of the dislocated semantics, and examines the semantic evolution process of the two. It is found that when the verbal noun “Du (度)” undergoes a part-of-speech change, it is often influenced by external factors of language, leading to a sudden mutation in domain restriction. However, when “Du (度)” is only subject to internal language mechanisms, its part-of-speech does not change, and it only extends new meanings within the domain field and transitional domain field. Therefore, the study of domain restriction has practical significance in the classification of Chinese verbs and nouns.