Interface-Mediated Mechanical Properties of Materials - Atomistic Simulation Studies

Li, Ao ProQuest Dissertations & Theses The University of 2016 해외박사(DDOD)

소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

Materials with critical dimension in the nanometer regime have demonstrated superior mechanical properties, including high strength, high hardness, and surface mechanical properties such as low friction and good wear resistance. These superior mechanical properties stem from the density, structure, chemistry, and energetics of interfaces in nanometer scale materials and from the way these interfaces interact with deformation-induced defects. In this thesis, we discuss three types of interfaces, the sliding contact interface between two pieces materials, grain boundaries (GBs) inside materials, and interfaces of nanolayered composite materials.

Aster glehni ameliorates scopolamine-induced cognitive impairment in mice

LIAO YULAN 경희대학교 대학원 2018 국내석사

Aster glehni Fr. Schm. (Asteraceae) is a region specific edible plant that only distributed in Ulleung-do Island, Republic of Korea. The leaves of A. glehni have been used as traditional and folk medicine for the therapy of insomnia, cardiovascular disease, and hypercholesterolemia in Korea. However, the effect of the leaves of A. glehni on cognitive function has yet been studied. In this study, we observed the enhancing effect of the ethanolic extract of the leaves of A. glehni (AG-D) on cognitive function using the passive avoidance test and the ameliorating effects of AG-D against scopolamine-induced memory impairments by the Morris water maze test, the passive avoidance test and the Y-maze test. AG-D (100 or 300 mg/kg, p.o) significantly enhanced memory function in normal naïve mice, ameliorated memory impairment in the passive avoidance test, and ameliorated spontaneous alternation in the Y-maze test versus the scopolamine-treated group. AG-D (30 or 100 mg/kg, p.o) significantly lengthened swimming time in the target quadrant in the Morris water maze task. The acetylcholinesterase (AChE) activity was significantly inhibited by AG-D (100 or 300 mg/kg, p.o). In addition, the phosphorylation levels of cAMP response element-binding protein (CREB), extracellular signal-regulated kinase (ERK), Protein kinase B (Akt), phosphatidylinositol 3-kinase (PI3K) and glycogen synthase kinase 3β (GSK-3β), and the expression level of brain-derived neurotrophic factor (BDNF) in the hippocampi, were increased after the administration of AG-D (100 or 300 mg/kg, p.o). Taken together, these results indicated that AG-D could ameliorate memory dysfunction caused by cholinergic blockade through the ERK-CREB-BDNF or the PI3K-Akt-GSK3-β signaling pathway and would be a useful material for the therapy of memory dysfunction or for the mild cognitive impairment.

(A) Comparative Analysis of Impacts of China’s and Japan’s Infrastructure Aid on Forest Cover Change in ASEAN Countries

Jing, Liao 경희대학교 대학원 2020 국내석사

For decades, scholars, policymakers and environmentalists have been debating on the relationship between foreign aid and the environment. The research in this regard has become more complicated because of the rising role of emerging countries as aid providers. There are divergent opinions on the impacts of these “newcomers” on aid effectiveness and the local environment as they are often criticized for their natural resource-seeking motivation. To understand the relationship between aid and the environment and test whether the relationship varies for aid from traditional or new donors, this research focuses on the infrastructure aid provided by China and Japan to five selected ASEAN countries and examines their environmental impacts in terms of forest cover change. Based on the Scale, Constitution and Technique (SCT) Effects Theory and other existing literature, a fixed effect regression model was employed for the panel analysis. The results show that aid from neither donor is negatively correlated with forest cover and also confirms that wood production, urbanization and economic development are the main drivers for forest loss in the ASEAN region.

Pitch contour formation in Mandarin Chinese : A Study of tone and intonation

Liao, Rongang UMI dissertation services 1994 국내석사

How Can Personality Predict Chinese Consumers' Credit Scores?

Liao Chenxi 경희대학교 대학원 2018 국내석사

With the rapid development of the Internet industry, Internet has become an indispensable part of everyone’s daily lives. Sesame credit is the independent third-party credit agency of ant financial. Zhima Credit is committed to addressing the trust problem between consumers and sellers and establishing a mutually beneficial and trustworthy business environment. Taking the advantages of big data, cloud computing, block chain and other innovative technologies, Zhima Credit has successfully integrated business and consumers’ livelihood and provided consumers with convenient and beneficial credit services such as free deposit, credit visa and speed claims, greatly enhancing consumers’ satisfaction. Besides, it helps sellers rebuild experience, improve efficiency, reduce risks and boost sales, so that they can also enjoy credit bonus. A higher Zhima Credit score is especially important for more trust. At present, the Zhima Credit has been applied to the most of industries. With the widespread of Zhima Credit in China, it is becoming increasingly crucial to take the Zhima Credit as a means of credit evaluation. In that case, this study tries to link “The Big Five” with Zhima Credit. In 1980s, psychologists developed a model based on five personality traits to evaluate human, which is the famous "The Big Five” personality tests. They are also referred to as OCEAN, the initials of openness, conscientiousness, extroversion, agreeableness and neuroticism. This paper will discuss whether and how one’s personality will affect the credit score from five perspectives.

Structure determination of bioactive metabolites from marine-derived fungi and simultaneous analysis of herbal medicines by HPLC-DAD-ELSD-MS

Liao, Lijuan 서울대학교 대학원 2015 국내박사

Part A. Structure Determination of Bioactive Metabolites from Marine-Derived Fungi Marine natural products have been proven to be a prolific source of novel therapeutic agents that have demonstrated significant activities in various pathological conditions including cancer, viral infection, inflammation, analgesia, and immune modulation. The marine-derived fungi is one of the three dominated phylogenetic groups, have shown great diversity of their secondary metabolites and a wide range novel secondary metabolites have been isolated since 1980s. Marine-derived fungi alone have produced more than 400 novel compounds, of which several have exhibited potent and diverse bioactivities. The purpose of this study is to investigate new marine natural products from marine-derived fungi and study their biological activities. During the course of searching for bioactive metabolites from marine-derived fungi, two strains Penicillium sp. and Aspergillus sp. were selected for chemical investigation based on LC-ESIMS analysis and bioassay screening of the crude extracts. Secondary metabolites from the selected fungi were isolated and structure determination based on 1D, 2D NMR, and IR, UV, OR and MS. As a result, 9 novel compounds and 9 known compounds were structurally determined using integrated spectroscopic analysis and chemical approaches. These compounds belonged to various structural classes: meroterpenoids, alkaloids, anthroquinones, and lipopeptides. The biological activities of the isolated compounds were studied on various bioactivity tests: cytotoxicity, antimicrobial activities, inhibition against the enzymes isocitrate lyase (ICL), sortase A (SrtA) and Na+/K+-ATPase, and quinone reductase. Structure-activity relationships were also deduced. Part B. Simultaneous Analysis of Herbal Medicines by HPLC-DAD-ELSD-MS Traditional herbal medicines have been practiced to maintain health and treat diseases especially in the Asia communities for more than 2,000 years. Increment of worldwide attention and concomitant pharmaceutical research has made it essential to carry out the quality control measurement for the herbal medicines. However, serious hindrance has been attributed to the lack of recognition and regulation of professions, qualified practitioners, quality-controlled herbal medicines, and evidence-based clinical studies. Thus it is urgently needed to establish a comprehensive qualified evaluation method that could accurately reflect the quality of herbal medicines. The purpose of this study is developing simultaneous analysis methods of bioactive compounds in herbal medicines. Two herbal medicines, which are Kalopanacis Cortex and Semen Ziziphus jujuba were subjected to the current study. In herbal medicines, it is hard to consider that single or a few compounds would determine the overall pharmacological activities. Rather, it is more likely that multiple compounds act simultaneously and attribute to the therapeutic function of the herbal medicine. For this reason, most bioactive metabolite in the selected herbal medicines were analyzed and determined. In particular, three phenolics and nine hedergenin saponins were selected for the analysis of Kalopanacis Cortex. Moreover, one alkaloid, five flavonoid saponins and three jujuboside saponins from Semen Ziziphus jujuba were also analyzed. The methods based on HPLC-DAD-ELSD-MS was established for the quantitative and qualitative analysis of a selected folk medicine. Various validation parameters, such as linearity, limit of detection, limit of quantification, recovery, accuracy, and precision, were successfully obtained. In addition, the efficiencies of diverse extraction methods were compared for the development of a standard analytic method. The verified methods were successfully applied to the quantitative determination of representative metabolites in commercial samples from Korea, Myanmar and China.

Risk sharing, quality of government and foreign participation in transnational public-private partnership projects (TPPPP)

Liao, Yanjiang Graduate School, Yonsei University 2021 국내석사

Public-Private Partnership is a typical mode of collaboration in which private parties are stimulated to provide resources and share risks with public sectors to take part in construction of infrastructure. Transnational PPP has become an important way for foreign investors and international financial institutions to engage in infrastructure construction of developing economies. Risk sharing and the quality of government (rule of law, government effectiveness, and control of corruption as three typical indicators) are important factors affecting foreign investors' participation in PPP construction in developing countries. In order to verify this hypothesis, taking 1595 infrastructure PPP projects from 100 developing countries from 2002 to 2019 as the research objects, this paper establishes an IV-Tobit regression model to analyze the effects of risk sharing and quality of government on foreign participation in transnational PPP markets. Finding results reflect that the lower the risk foreign participants take in PPP projects, the higher the degree of foreign participation. Meanwhile, high quality of government positively moderates the negative relationship between risk sharing and foreign participation. PPP 은 민간이 자원을 제공하고 공공 부문과 위험을 공유하여 인프라 구축에 참여하도록 권장하는 전형적인 협업 방식이다. 국제 PPP 는 개발도상국의 인프라 건설에 외국인 투자자와 국제 금융 기관이 참여하는 중요한 방법이 되었다. 위험 분담과 정부의 질(법치, 정부 효과성, 그리고 부패 통제 3 가지 대표적인 지표로서)은 개발도상국에서의 외국인 투자자들의 PPP 건설 참여에 영향을 미치는 중요한 요소이다. 본 논문은 2002 년부터 2019 년까지 100 개 개발도상국의 1595 개 인프라 PPP 프로젝트를 연구 대상으로 삼아 해외 PPP 시장 참여에 대한 위험 분담 및 정부 품질의 영향을 분석하는 IV-토비트 회귀 모델을 구축한다. 조사 결과는 외국인 참여자들이 PPP 프로젝트에서 감수하는 위험이 낮을수록 외국인 참여의 정도가 높다는 것을 반영한다. 한편, 정부의 높은 질은 위험 분담과 외국인 참여 사이의 부정적인 관계를 긍정적으로 완화한다.

차이리(彩禮)를 통해서 본 중국의 결혼 문화

Liao Qiong 서강대학교 대학원 2023 국내석사

This paper aims at exploring the current marriage culture in China, particularly focusing on social contradictions surrounding ‘bride price:’ which functions like ‘dowry’ in a traditional marriage. The research questions in this paper concern the transformation of the bride price from a conventional marriage custom to a social contradiction, the variables influencing the average regional bride price difference, the contradiction at the heart of the bride price issue and the primary viewpoint, and the marriage strategies that are reflected in the bride price negotiation. Chapter 2 focuses on domestic and international research on marriage and families as well as the existing research related to bride price. The research methods are illustrated in Chapter 3. In order to collect and analyze the data, statistical analysis, literature research, and network ethnography were used. In chapter 4, the associated study findings are described in three parts. The statistical analysis findings of the factors affecting the amount difference in regional bride prices are presented in chapters 4.1 and 4.2. In addition, chapter 4.3 explores the origins of the bride price problem using a literature analysis and network ethnographic research methods. This query can be broken down into two more manageable ones: Why did the problem originate in rural China in the 20th century, and why did it then expand to the entire nation from there? The majority of the current study on bride price focuses on the first query. Scholars frequently concentrate on the social factors that cause women to dominate the marriage market from the perspectives of high marriage costs and rural men's difficulties getting married, but they hardly ever discuss why more and more women demand bride prices and what the underlying cause of this social phenomenon is. Therefore, from a feminism perspective, this paper focuses on the core of the gender conflict surrounding the bride price, especially the role of young women in it. This paper explores the causes and progression of bride price's evolution from the traditional marriage custom to the present-day social contradictions with the growth of society and puts forward the existing problems in the current marriage law based on the literature and associated records. At the same time, this paper observes and records the public discussion and related practice on the bride price in social networks, summarizes typical cases, and analyzes how gender and social demographic factors affect the scope and makeup of bride price conditions, as well as the connection between the bride price controversy and issues of gender inequality and contradiction. The significance of the paper resides in two main areas. First, it explores the fundamental reasons why the phenomenon of bride price culture in China has has spread and grown more intricate. It has also been found that changes in women's property inheritance and administration rights as well as changes in private property in the marriage system affect attitudes toward bride price and the amount of bride price.This paper also also analyzes the differences and influencing variables of bride price in various regions in order to better understand how national common factors and specific regional cultures affect bride prices. It has practical relevance for the creation of a harmonious society and the relief of significant gender contradictions. It is useful for analyzing and maximizing the problem from multiple perspectives and levels. 본 논문은 중국의 결혼 문화에서 가장 논쟁이 되고 있는 ‘차이리’ 즉 일종의 현금화된 혼수에 관해 포괄적으로 연구한다. 본 논문의 연구질문은 차이리가 전통적 혼인풍속에서 사회적 모순으로 변하게 된 과정, 지역별 차이리의 평균 차이에 영향을 주는 요인, 차이리를 둘러싼 핵심 갈등 및 주요 관점, 그리고 결혼 전략이 차이리 협상에서 어떻게 구현되는지에 관한 것이다. 이러한 문제 의식 하에 본 논문 2장에서는 서구와 중국의 혼인과 가족연구, 그리고 차이리와 관련한 기존 연구를 중심으로 고찰하였다. 3장에서는 연구 방법에 대해 설명하고 있는데. 본 연구는 통계 분석, 문헌 연구 및 인터넷 민족지 연구 방법을 이용하여 자료를 수집하고 분석하였다. 이에 따른 연구 결과는 4장에 세 개의 절로 설명되었다. 4장 1절과 2절에서는 지역별 차이리 차이에 영향을 주는 요인에 대한 통계 분석 결과를 제시하였다. 그리고 4장 3절에서는 문헌 연구와 인터넷 민족지 연구 방법을 통해 차이리 논쟁은 나타나는 원인을 논하였다. 이 문제는 또 두 개의 작은 문제로 나눌 수 있는데, 첫 번째는 20세기 농촌 지역에서는 왜 차이리 분쟁이 일어났는가 하는 것이다. 두 번째는 차이리 분쟁이 왜 농촌에서 전국으로 확산됐는가 하는 것이다. 차이리 관련 기존 연구는 대부분 첫 번째 문제에 대한 검토에 머물러 있다. 기존 연구에서는 높은 결혼 비용과 남성의 결혼난 입장에서 여성이 결혼시장에서 주도권을 잡을 수 있는 사회적 조건에 관심을 갖는 반면 왜 점점 더 많은 여성들은 차이리를 요구하는지, 이러한 사회적 행위 뒤에 숨는 문제의 본질이 무엇인지를 다루지 않았다. 따라서 본 연구는 페미니즘 관점에서 차이리를 둘러싼 젠더갈등의 근원, 특히 젊은 여성들이 발휘하는 역할에 주목하였다. 본 논문은 주로 문헌 자료와 기록에 근거하여 사회 발전에 따라 차이리는 왜, 그리고 어떻게 전통적인 결혼 예절에서 오늘날 사회 모순으로 변하게 되었는지를 분석했으며 현행 혼인법에 존재하는 문제점을 제시하였다. 이와 함께 소셜 네트워크에서 차이리에 대한 공중 담론 및 관련 실천을 관찰하고 기록하며 전형적인 사례를 정리하고 성별과 사회인구학적 변인들은 차이리의 금액과 조건을 구성하는 데에 어떻게 영향을 미치는지, 또한 차이리 논쟁은 젠더갈등, 젠더 불평등과 어떤 연관성이 있는지를 분석하였다. 본 연구의 의의는 먼저 중국의 차이리 문화 현상이 갈수록 보편화되고 복잡해지는 심층적인 원인을 설명하였다는 데 있다. 그리고 차이리를 둘러싼 젠더갈등의 근원, 특히 차이리에 대한 사람들의 태도와 차이리의 양이 결혼에서 여성의 재산 상속권 및 관리권의 변화 및 혼인 제도에서 사유재산의 변화와 밀접한 관련이 있다는 것을 발견하였다. 또한 본 논문은 지역별 차이리의 차이와 영향요인 분석을 진행하였다. 이를 통해 차이리에 전국 공통적인 영향요인과 특정 지역적 문화의 영향을 명확히 파악할 수 있으며 다양한 시각과 차원에서 문제를 분석하고 최적화하는데 도움이 되어 조화사회를 건설하고 심각한 젠더갈등을 완화하는 데 실질적인 의미가 있다.

Study on motorcycle dependence in Taipei

Liao, Fanglin Graduate School of Policy Studies, Korea Universit 2012 국내석사

CBEC 소비자의 라이브 스트리밍 서비스 플로우 체험

Liao, Shuya 경희대학교 대학원 2021 국내석사

본 연구에서는 플로우 체험(flow experience)이 CBEC 플랫폼 라이브 스트리밍 환경에서 소비자 구매의도에 미치는 영향의 중요성을 강조했다. 그러나 CBEC 플랫폼 라이브 스트리밍 환경에서 플로우 체험 개념에 대한 실증 분석을 진행한 연구가 드문 관계로, 본 논문은 CBEC 플랫폼 라이브 스트리밍 환경에서 사회적 유대감과 구조적 유대감을 기반으로 소비자의 플로우 체험에 미치는 영향 정도를 검토하고, 더 나아가 소비자 플로우 체험의 구매의도에 대한 영향성을 검증하였다. 온라인 쇼핑 시장이 급속도로 발전하여 CBEC 플랫폼 시장의 경쟁이 치열하다. 각 CBEC 플랫폼이 경쟁에서 유리한 위치를 차지하려면 소비자들의 온라인 행동 특징을 면밀히 살펴야 한다. 현재 소비자들은 전통 인터넷 쇼핑몰보다 생방송을 통한 제품 구매를 선호하고 있다. 전통적인 전자상거래 플랫폼은 소비자와 플랫폼의 일방적인 관계이고, 생방송은 브로드캐스터를 통해 소비자와 플랫폼의 상호관계를 더욱 긴밀하게 연결시킨다. 소비자의 쇼핑 패턴이 바뀌면서, 소비자의 온라인 체험은 그들의 CBEC 플랫폼의 선택, 구매 의도, 기타 구매 행위에 영향을 주었다. 심리적 관점에서 플로우 체험 이론은 소비자 체험과 소비자의 온라인 쇼핑 행위를 연구하는 데 새로운 시각을 제공한다. 플로우 체험(flow experience)이란 소비자가 CBEC 플랫폼의 라이브 스트리밍 환경에서 얻는 긍정적인 심리상태를 말하며 이러한 과정에 대한 즐거움과 몰입도를 발생시킨다. 플로우 체험은 소비자 참여로 표현돼 구매의도가 형성되는 일종의 심리 과정이다. 이를 위해 이론적 연구 모델을 제시하고, CBEC 플랫폼으로 쇼핑을 해 본 410 명의 중국 소비자를 조사 대상으로 하여 실증분석을 진행한다. 연구결과, 첫째는 플로우 체험(즐거움, 몰입도)이 CBEC 플랫폼 라이브 스트리밍에 대한 소비자 구매의도를 향상시킨다는 결과를 검증하였다. 소비자의 플로우 체험이 강해질수록, CBEC 플랫폼에 대한 적극적인 참여와 탐색이 높아진다. 둘째, CBEC 플랫폼 라이브 스트리밍 서비스를 사용 시 소비자의 사회적 유대감은 플로우 체험의 형성을 촉진하는 효과가 있다는 결과를 검증하였다. 셋째, 온라인 쇼핑 환경에서 소비자들은 구매의 실제 유형적 가치보다 경험을 더 높이 평가하는 경향이 있다. CBEC 라이브 스트리밍 환경에서 실용성 감지는 소비자 플로우 체험의 즐거움에 영향을 미치지만 소비자 몰입도에는 영향을 미치지 않다는 결과를 검증하였다. 측, CBEC 라이브 스트리밍 환경에서는 사회적 유대감(생동감, 상호작용성)이 플로우 체험의 형성에 영향을 미치는 가장 큰 요인이다. CBEC 플랫폼 관리자에게 있어서 본 연구의 실질적 의미는 CBEC 플랫폼 설계 시 플랫폼에 대한 소비자의 플로우 체험을 우선적으로 고려해야 한다는 것이다. 즉, 관계적 유대감을 확립하고 플로우 체험 발생을 촉진시키고 소비자 구매의도를 향상시키는 목적이 달성된다. 따라서 플랫폼의 관리자는 생방송을 통해 소비자와 간에 관계적 유대감을 연결시킨다. This study was designed to report the long-term This study emphasized the importance of the effect of flow experience on consumer purchase intention in the CBEC platform live streaming environment. However, since studies that have conducted empirical analysis on the concept of flow experience in the CBEC platform live streaming environment are rare, this paper examines the degree of impact on the flow experience of consumers based on social bonds and structural bonds in the CBEC platform live streaming environment. Furthermore, the influence of consumer flow experience on purchase intention was verified. With the rapid development of the online shopping market, the CBEC platform market is fiercely competitive. In order for each CBEC platform to gain a competitive advantage, it must take a closer look at the characteristics of consumers' online behavior. Currently, consumers prefer to purchase products through live broadcasting over traditional Online shops. Traditional ecommerce platforms are a one-sided relationship between consumers and platforms, and live broadcasting connects consumers and platforms more closely through broadcasters. As consumers change their ways of shopping their online experiences have influenced their choice of CBEC platform, purchase intentions, and other shopping behaviors. From a psychological point of view, the flow experience theory provides a new perspective for studying consumers‟ experiences and online shopping behaviors. The flow experience refers to the positive mental state that consumers get in the live streaming environment of the CBEC platform, and it makes the shopping experience pleasant and immersive. Flow experience is a kind of psychological process that is expressed by consumer participation and the purchase intention is formed. To this end, a theoretical research model is presented, and an empirical analysis is conducted by targeting 342 Chinese consumers who have shopped on the CBEC platform. As a result of the study, first, it was verified that the flow experience (pleasure, immersion) improves consumer purchase intention for live streaming on the CBEC platform. The Stronger feelings of involving flow experience the consumers have the more active participation and exploration the CBEC platform Will take. Second, it was verified that the consumer's social bonds have the effect of promoting the formation of flow experience when using the CBEC platform live streaming service. Third, in the online shopping environment, consumers tend to value experience higher than the actual tangible value of purchase. In the CBEC live streaming environment, it was verified that practicality detection affects the enjoyment of consumer flow experience, but does not affect consumer immersion. On the side, in the CBEC live streaming environment, social bond (liveliness, interactivity) is the biggest factor influencing the formation of flow experiences. For CBEC platform managers, the practical implication of this study is that when designing the CBEC platform, the consumer's flow experience on the platform should be considered first. That is, the purpose of establishing a relational bond, Facilitating flow experience generation, and improving consumer purchase intention. Therefore, the platform manager builds the relationship with the consumer through live broadcasting