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Jung, Hyun Jun,Moon, Jae Won,Song, Yooseob,Song, Daniel,Hong, Seong Kwang,Sung, Tae Hyun Institute of Pure and Applied Physics 2014 Japanese Journal of Applied Physics Vol. No.
<P> The purpose of this study is to design a piezoelectric energy harvester (PEH) that not only resists damage but also generates a higher power when impact is applied. To increase the generated power and durability a PEH, in this study, we investigated a new model and carried out numerical simulations of and experiments on the PEH. The numerical simulation results show that the stress distribution of the proposed PEH is more uniform than that of a conventional impact-type PEH. Thus, the proposed PEH decreases its possibility of being damaged. Experimental results for power under a matched impedance condition show that the maximum RMS powers of the conventional impact-type and proposed PEHs were 0.69mWat 16 kΩ and 3.97mW at 7 kΩ, respectively. Furthermore, the peak power of the proposed PEH was 518mW, which was 3,047% higher than that of the conventional impact-type PEH having a peak power of 17mW. </P>
Daniel S. Thoma,정의원,Alfonso Gil,Myong Ji Kim,Kyeong-Won Paeng,Ronald E. Jung,Stefan Fickl 대한치주과학회 2019 Journal of Periodontal & Implant Science Vol.49 No.3
Purpose: To evaluate the effects of intra-alveolar socket grafting, subepithelial connective tissue grafts, and individualized abutments on peri-implant hard and soft tissue outcomes following immediate implant placement. Methods: This randomized experimental study employed 5 mongrel dogs, with 4 sites per dog (total of 20 sites). The mesial roots of P3 and P4 were extracted in each hemimandible and immediate dental implants were placed. Each site was randomly assigned to 1 of 4 different treatment groups: standardized healing abutment (control group), alloplastic bone substitute material (BSS) + standardized healing abutment (SA group), BSS + individualized healing abutment (IA group), and BSS + individualized healing abutment + a subepithelial connective tissue graft (IAG group). Clinical, histological, and profilometric analyses were performed. The intergroup differences were calculated using the Bonferroni test, setting statistical significance at P<0.05. Results: Clinically, the control and SA groups demonstrated a coronal shift in the buccal height of the mucosa (0.88±0.48 mm and 0.37±1.1 mm, respectively). The IA and IAG groups exhibited an apical shift of the mucosa (−0.7±1.15 mm and −1.1±0.96 mm, respectively). Histologically, the SA and control groups demonstrated marginal mucosa heights of 4.1±0.28 mm and 4.0±0.53 mm relative to the implant shoulder, respectively. The IA and IAG groups, in contrast, only showed a height of 2.6 mm. In addition, the height of the mucosa in relation to the most coronal buccal bone crest or bone substitute particles was not significantly different among the groups. Volumetrically, the IA group (−0.73±0.46 mm) lost less volume on the buccal side than the control (−0.93±0.44 mm), SA (−0.97±0.73 mm), and IAG (−0.88±0.45 mm) groups. Conclusions: The control group demonstrated the most favorable change of height of the margo mucosae and the largest dimensions of the peri-implant soft tissues. However, the addition of a bone substitute material and an individualized healing abutment resulted in slightly better preservation of the peri-implant soft tissue contour.
Through Silicon Via (TSV) Defect Modeling, Measurement, and Analysis
Jung, Daniel H.,Youngwoo Kim,Kim, Jonghoon J.,Heegon Kim,Sumin Choi,Yoon-Ho Song,Hyun-Cheol Bae,Kwang-Seong Choi,Piersanti, Stefano,de Paulis, Francesco,Orlandi, Antonio,Joungho Kim IEEE 2017 IEEE transactions on components, packaging, and ma Vol.7 No.1
<P>Through silicon via (TSV)-based 3-D integrated circuit has introduced the solution to limitlessly growing demand on high system bandwidth, low power consumption, and small form factor of electronic devices. As the system design aims for higher performance, the physical dimensions of the channels are continuously decreasing. With TSV diameter of less than 10 mu m and pitch of several tens of micrometers, the I/O count has increased up to the order of tens of thousands for wide bandwidth data transmission. However, without highly precise fabrication process, such small structures are susceptible to a variety of defects. For the first time, in this paper, we propose a noninvasive defect analysis method for high-speed TSV channel. With designed and fabricated test vehicles, the proposed method is demonstrated with S-parameter and time-domain reflectometry measurement results. In addition, we present equivalent circuit models of TSV daisy-chain structures, including the circuit components for open defect and short defect. With characterized dominant factors in each frequency range, S-11 is analyzed to distinguish and locate the defects by the amount of capacitance, resistance, and inductance that the signal experiences. S-parameter measurement sufficiently allows high-frequency defect analysis of TSV channel without destroying the test sample. We experimentally verified the accuracy of the suggested model by comparing the S-parameter results from circuit simulations and measurements. Finally, the model is modified to discuss the effects of open defect and short defect on the electrical characteristics of TSV channel.</P>
Biodiesel synthesis using chicken manure biochar and waste cooking oil
Jung, Jong-Min,Lee, Sang-Ryong,Lee, Jechan,Lee, Taewoo,Tsang, Daniel C.W.,Kwon, Eilhann E. Elsevier Applied Science 2017 Bioresource technology Vol.244 No.1
<P><B>Abstract</B></P> <P>This study laid an emphasis on the possible employment of biochar generated from pyrolysis of chicken manure to establish a green platform for producing biodiesel. To this end, the pseudo-catalytic transesterification reaction using chicken manure biochar and waste cooking oil was investigated. Compared with a commercial porous material (SiO<SUB>2</SUB>), chicken manure biochar generated from 350°C showed better performance, resulting in 95.6% of the FAME yield at 350°C. The Ca species in chicken manure biochar imparted strong catalytic capability by providing the basicity for transesterification. The identified catalytic effect also led to the thermal cracking of unsaturated FAMEs, which decreased the overall FAME yield. For example, 40–60% of converted FAMEs were thermally degraded. To avoid undesirable thermal cracking arising from the high content of the Ca species in chicken manure biochar, the fabrication of chicken manure biochar at temperatures ≥350°C was highly recommended.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Biodiesel synthesis using chicken manure biochar. </LI> <LI> Establish a green platform for producing biodiesel using chicken manure biochar. </LI> <LI> Enhanced yield of biodiesel using chicken manure biochar due to strong catalytic capability. </LI> <LI> 95.6% of the FAME yield using chicken manure biochar generated from 350°C. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Daniel J. Kim,Jae-Jung Kang,Boo-Yun Cho 한국인터넷전자상거래학회 2014 인터넷전자상거래연구 Vol.14 No.2
A televised debate on regulatory reform strategies, presided over by South Korean President Park Geun-hye, took place in March 2014. One of the issues that drew significant attention was the effect of requiring digital signature certificates and Active-X for online transactions on cross-border e-commerce. The critics argue that the requisite digital signature certificates and Active-X make it extremely difficult for foreign customers to make purchases from Korean online stores. For foreign consumers who are accustomed to straightforward e-commerce payment systems found in the developed world that are designed to be secure but simple and user-friendly ? such as used by Amazon.com where providing an e-mail address and credit card information is enough to make online purchases ? the Korean online payment system is the sufficient(if not primary) reason to avoid Korean online sellers. In comparison to the global standard, the Korean e-commerce system is not only inefficient but also causes consumer dissatisfaction. Moreover, it is actually an effective barrier against international trade. Many critics call for deregulation of the current online payment system that requires digital signature certification and Active-X, but without offering method of ensuring online security. In light of the debate on regulatory reform of the Korean e-commerce payment system, this paper seeks to propose some possible options for replacing the current system. The paper begins by identifying the key issues in the debate. It then provides a critical evaluation of Active-X and summarizes how online transactions are carried out in other countries. The paper continues with the history of the so-called public key infrastructure(PKI) in Korea, which set the framework for the current online payment system with digital signature certification and Active-X. In the next section, the current system is analyzed within an institutional framework using the concept of path dependence. The paper closes with proposing four models for reforming the system, with the suggestion that South Korea might become the logistics hub for e-commerce trade in Far East, by acting as the distribution center for goods traded online.
Agricultural Commodity Programs in the United States: Reform, Reversal and WTO Implications
( Daniel A. Sumner ),( Jung Sup Choi ) 한국농촌경제연구원 2000 Journal of Rural Development Vol.23 No.2
American farm programs have gradually evolved over decades, and the FAIR Act continued the significant changes in form of the subsidy by reducing the effects on production. The large recent payments to U.S farmers continue to affect trade somewhat. But, these payments should not limit progress in the new WTO agricultural round if it focuses on border measures. For this WTO round, the U.S. could facilitate liberal trade by proposing the elimination of agricultural tariffs, export subsidies, and export taxes or embargoes. Limits on the use of anti-dumping duties or barriers to block import "surges," reform of rules related to countervailing duties, and keeping science-based Sanitary and Phytosanitary rules are also vital to facilitate progress in negotiations.