• Applied Chemistry for Engineering
• /
• v.25 no.1
• /
• pp.1-13
• /
• 2014

Lithium ion batteries (LIBs) are the state-of-the-art technology among electrochemical energy storage and conversion cells, and are still considered the most attractive class of battery in the future due to their high specific energy density, high efficiency, and long cycle life. Rapid development of power-hungry commercial electronics and large-scale energy storage applications (e.g. off-peak electrical energy storage), however, requires novel anode materials that have higher energy densities to replace conventional graphite electrodes. Germanium (Ge) and silicon (Si) are thought to be ideal prospect candidates for next generation LIB anodes due to their extremely high theoretical energy capacities. For instance, Ge offers relatively lower volume change during cycling, better Li insertion/extraction kinetics, and higher electronic conductivity than Si. In this focused review, we briefly describe the basic concepts of LIBs and then look at the characteristics of ideal anode materials that can provide greatly improved electrochemical performance, including high capacity, better cycling behavior, and rate capability. We then discuss how, in the future, Ge anode materials (Ge and Ge oxides, Ge-carbon composites, and other Ge-based composites) could increase the capacity of today's Li batteries. In recent years, considerable efforts have been made to fulfill the requirements of excellent anode materials, especially using these materials at the nanoscale. This article shall serve as a handy reference, as well as starting point, for future research related to high capacity LIB anodes, especially based on semiconductor Ge and Si.

• 한국사회정책
• /
• v.25 no.3
• /
• pp.3-35
• /
• 2018

This article critically reviews the arguments that deny the financial feasbility and effectiveness of universal basic income as an alternative to existing social security systems and makes some suggestions to design effective and efficient basic income schemes. Regarding the financial feasibility of universal basic income, I argue that replacement of the existing regressive tax expenditures with universal basic income without raising tax rates can effectively reduce tax burden or provide income support to a majority of people except the rich. Addition of basic income to the tax base and reduction of the number of beneficiaries of public assistance and the amount of cash payment for them can further help save money. Regarding the redistributive effect, I note that the targeting ability of the existing social security systems is not good and that "the paradox of redistribution" that universal-type programs tend to be more redistributive than selective programs applies to universal basic income as well. I demonstrate significant redistributive effect of a hypothetical revenue-neutral basic income scheme and reviews several empirical studies done in Korea and abroad to show that basic income can be more effective in redistribution than social insurances or public assistance programs. Lastly, I emphasize the need to construct a reliable tax-benefit microsimulation model to help researchers to study redistributive effects of basic income schemes and other taxes and social policies.

• 한국사회정책
• /
• v.25 no.4
• /
• pp.105-124
• /
• 2018

This article analyzes individualization of family policies and gender division of unpaid work in Germany, Netherlands and South Korea. Measured in terms of women's employment promotion, the individualization at the policy level was greater in Korea than both Germany and Netherlands. However, married women's share of unpaid work was substantially larger in Korea than Germany and Netherlands. The strong unequal divison of unpaid work was also the case among working married women. Regression analysis showed that share of unpaid work in Korea was related to relative income in all three countries. But while gender ideology was positively related to married women's share of unpaid work in Germany and Netherlands, the relationship was not found in Korea. Gender of respondent was also an explanatory factor for all three countries. The influence of married women's relative income and gender ideology on share of unpaid work was similar to or larger than the effect of gender of respondents in Germany and Netherlands. By contrast, it was gender of respondent that mattered most for married women's share of unpaid work in Korea. Among working married women, we found that both relative income and gender ideology were related to differences in share of unpaid work in Germany and Netherlands which was either similar to or larger than the effect of gender of respondent. However, we found that gender of respondent mattered most in Korea.

• 한국사회정책
• /
• v.25 no.3
• /
• pp.175-208
• /
• 2018

The purpose of this article is to evaluate Korea's income-led growth policy that is still in dispute. To do this, I discussed the content, background and implications of the income-led growth theory. Next, I discussed the role of income-led growth as a growth strategy in the Korean economy. The income-led growth theory comes from the Keynesian tradition which emphasizes the role of demand in the economic growth. The basic idea emerged nearly 80 years ago, and the current model emerged about 30 years ago. Some of the Korean researchers began to pay attention to this issue when ILO researchers discussed it in 2010. The recent emphasis on income-led growth theory was due to the tendency of declining labor income, thus forming a consensus that increasing inequality can hamper growth. The effectiveness of the income-led growth strategy, which can lead to economic growth by increasing the share of labor income, is theoretically and empirically controversial. However, it is understandable why income-led growth strategies have emerged. Income-led growth is not a short-term strategy nor a key of growth strategy. However, in current socio economic structures, the prescriptions of income-led growth theory is meaningful in that it enables sustainable growth by making the economic system healthy. In addition, unlike the West, the government's welfare expenditure can play a significant role as part of the income-led growth prescriptions in Korea.

• (The) Research of the performance art and culture
• /
• no.25
• /
• pp.135-181
• /
• 2012

The celebration day of national foundation(開國紀元節) is to celebrate the foundation of Joseon by Taejo Lee Seong Gye. It is also shortly called as the celebration day. The events celebrating this were performed either on a large or small scale by the court or the people from 1895 right before 1910, the Korea-Japan Annexation. As you can see from the period of its performance, the celebration day of national foundation was not one of the Joseon's traditional court events, but it was one of the national holidays(慶節) institutionalized newly after the port opening (1876). In Korea, too, they strived to concentrate on modernization as exchanging with all different countries in the world after the port opening. Also, they considered how to concretize all different celebration events for national holidays characterized by the modern days of celebration. As a result, additionally or partly from the traditional court events, the events to celebrate national holidays appeared one after another from 1895. And this article examined the celebration day of national foundation, one of the national holidays referred to as modern-style days of celebration. The event to celebrate this can be seen from Geongbok-gung(景福宮) on the day of July 16th, 1895. And the Independence Association(獨立協會) also held the event for the celebration day of national foundation. The event performed for the celebration day of national foundation shows very distinct aspects on the ground to maintain the congratulatory ways partly. In particular, the ritual for the celebration day of national foundation held by the Independence Association induced modernized ways of celebration such as the congratulatory address and speech, and it also included new elements like the harmony of various music including court music(宮中音樂) or Chang-ga(唱 歌).

• Advances in nano research
• /
• v.10 no.2
• /
• pp.115-128
• /
• 2021

In this article, free vibration behavior of electro-magneto-thermo sandwich Timoshenko beam made of porous core and Graphene Platelet Reinforced Composite (GPLRC) in a thermal environment is investigated. The governing equations of motion are derived by using the modified strain gradient theory for micro structures and Hamilton's principle. The magneto electro are under linear function along the thickness that contains magnetic and electric constant potentials and a cosine function. The effects of material length scale parameters, temperature change, various distributions of porous, different distributions of graphene platelets and thickness ratio on the natural frequency of Timoshenko beam are analyzed. The results show that an increase in aspect ratio, the temperature change, and the thickness of GPL leads to reduce the natural frequency; while vice versa for porous coefficient, volume fractions and length of GPL. Moreover, the effect of different size-dependent theories such as CT, MCST and MSGT on the natural frequency is investigated. It reveals that MSGT and CT have most and lowest values of natural frequency, respectively, because MSGT leads to increase the stiffness of micro Timoshenko sandwich beam by considering three material length scale parameters. It is seen that by increasing porosity coefficient, the natural frequency increases because both stiffness and mass matrices decreases, but the effect of reduction of mass matrix is more than stiffness matrix. Considering the piezo magneto-electric layers lead to enhance the stiffness of a micro beam, thus the natural frequency increases. It can be seen that with increasing of the value of WGPL, the stiffness of microbeam increases. As a result, the value of natural frequency enhances. It is shown that in hc/h = 0.7, the natural frequency for WGPL = 0.05 is 8% and 14% less than its for WGPL = 0.06 and WGPL = 0.07, respectively. The results show that with an increment in the length and width of GPLs, the natural frequency increases because the stiffness of micro structures enhances and vice versa for thickness of GPLs. It can be seen that the natural frequency for aGPL = 25 ㎛ and hc/h = 0.6 is 0.3% and 1% more than the one for aGPL = 5 ㎛ and aGPL = 1 ㎛, respectively.

• The Journal of Korean Philosophical History
• /
• no.25
• /
• pp.355-379
• /
• 2009

According to the estimations in historical books and research achievements which have been produced, Ji-kang was a prominent Taoist in the Wei-Jin dynasty. But some philosophers, on their opinions, regard Ji-kang as a scholar who withdrawal from ordinary life in the real society. In this sense, this article investigates the Ji-kang's perspective of the life in seclusion, in particular, by analysing the letter to Shan Ju-yuan in breaking off relations與山居源絶交書. The purpose of this thesis is to clarify Ji-kang's the ideal of life, by discussing the reaction to the realistic society, the reflection on the confused society and the change into the new ideal of life of Ji-kang. Ji-kang's the ideal of life in the letter to Shan Ju-yuan in breaking off relations與山居源絶交書 have the following characteristics: First, he has pursued to participate in the real society by passive and immediate way, but he realized how difficult his ideal comes true. Thus, he seek the new ideal of life, hermit. Second, according to the view of hermit in the ancient Chinese tradition, his view of hermit implicates the change in his ideological tendency from the hermit of Confucianism and Taoism to the hermit of Taoism. Third, he tried whatever methods that were passive and seclusive to participate in the real society, but he isn't a common idealist. In this way, Ji-kang applied these thought of the social life and the ideal of life to the philosophy of living.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
• /
• v.29 no.1
• /
• pp.15-25
• /
• 2023

Since the COVID-19 crisis, the use of disposable packaging materials and delivery services, which raise environmental and social issues with waste disposal, has significantly increased. Antimicrobial active packaging has emerged as a viable solution for extending the shelf-life of foods by minimizing microbial growth and decomposition. In this review article, we provide a comprehensive overview of current research trends in antimicrobial active film and coating published over the last five years. First, we introduced various polymer materials such as film and coating that are used in active packaging. Next, various types of antimicrobial (antibacterial, antifungal, and antiviral) packaging including essential oil, extracts, biological material, metal, and nanoparticles were introduced and their activities and mechanisms were discussed. Finally, the current challenges and prospects were discussed. Overall, this review provides insights into the recent advancements in antimicrobial active packaging research and highlights the potential of the technology to enhance food safety and quality.

• Archives of Craniofacial Surgery
• /
• v.25 no.2
• /
• pp.62-70
• /
• 2024

Background: The management of cleft lip and palate aims at improving the patient's aesthetic and functional outcomes. Delaying primary repair can disrupt the patient's functional status. Long-term follow-up is essential to evaluate the need for secondary repair or revision surgery. This article presents the epidemiology of cleft lip and palate, including comprehensive patient characteristics, the extent of delay, and secondary repair at our institutional center, the Bandung Cleft Lip and Palate Center, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia. Methods: This retrospective study aimed to determine the epidemiology and recurrence rates of cleft lip and palate at the Bandung Cleft Lip and Palate Center, Indonesia, from January 2007 to December 2021. The inclusion criteria were patients diagnosed with cleft lip and/or palate. Procedures such as labioplasty, palatoplasty, secondary lip and nasal repair, and alveolar bone grafting were performed, and data on recurrence were available. Results: In total, there were 3,618 patients with cleft lip and palate, with an age range of 12 months to 67 years. The mean age was 4.33 years, and the median age was 1.35 years. Males predominated over females in all cleft types (60.4%), and the cleft lip was on the left side in 1,677 patients (46.4%). Most cases were unilateral (2,531; 70.0%) and complete (2,349; 64.9%), and involved a diagnosis of cleft lip and palate (1,981; 54.8%). Conclusion: Delayed primary labioplasty can affect daily functioning. Primary repair for patients with cleft lip and palate may be postponed due to limited awareness, socioeconomic factors, inadequate facilities, and varying adherence to treatment guidelines. Despite variations in the timing of primary cleft lip repair (not adhering to the recommended protocol), only 10% of these patients undergo reoperation. Healthcare providers should prioritize the importance of the ideal timing for primary repair in order to optimize physiological function without compromising the aesthetic results.

• Journal of Forest and Environmental Science
• /
• v.14 no.1
• /
• pp.112-127
• /
• 1998

A meeting for Japan Society of Erosion Control Engineering took place, from May 20-21 in Sapporo, Japan, with the presentations of 21 special topics and 185 general papers. Special topics consists of 6 copies on volcanic disaster prevention, 6 copies on the activity report of Earthquake Erosion Control Engineering Society, 5 copies on the management and guidelines of riparian zone and 4 copies on debris disaster occurred in 1997. General papers consists of 10 copies on slope stability, 10 copies on slope failure, 9 copies on earthquake, 41 copies on environmental erosion control, 25 copies on debris flow, 11 copies on warning and refuge, 10 copies on erosion control plan, 11 copies on erosion control project, 10 copies on erosion control facility, 12 copies on volcanic erosion control, 4 copies on revegetation technology, 4 copies on forest hydrology, 4 copies on avalanche, 4 copies on landslide, 18 copies on debris flow and 2 other copies presented by international student. Among the special topics, 5 papers with the titles of the function and structure of riparian zone, the interactive relation of flood and riparian zone, the management method of channel and river forest for controlling debris flow, the forest restoration efforts by native population, the law and social issue for building river riparian zone were presented in the subsection of "The Management and Guidelines of Riparian Zone". Thus, this article summarize and introduce the presented contents which are very important and can be referred to keep environmentally sound-river in the erosion control field.