위대한 교수님의 학술잡지 편집

Creative Commons는 저작권에 대한 국제적인 활동으로 제한적인 저작권 인정을 통하여 저작물의 공익적 활용을 확대하자는 것입니다.Fundamental differences of a scholarly journal from periodicals for general public are the semi-closed audience, pre-publication peer review and post-publication utilization by citation through indexing system. Authors and readers are professionals from the academic society and from related fields and they use the journal as a communication tool among scientists as well as a parameter or evaluation tool of his academic activity. The editor of a scholarly journal is often a leader of the academic society and plays as a moderator of peer review and as a facilitator of indexing of published articles. Associations of scholarly journal editors function as capacity builders for editors who are professionals on his own knowledge domain but they are never professionals on journal editing or publishing. Korean Association of Medical Journal Editors established in 1996 developed journal evaluation system and KoreaMed, an indexing system for medical articles of journal titles selected through the evaluation process. Representatives from member states of the Western Pacific Region of World Health Organization decided to develop a regional indexing system (WPRIM, Western Pacific Region Index Medicus) for journal articles from member states of this region. They also adopted KoreaMed as a search engine for multinational medical information index. Meetings of informal consultation and meetings for WPRIM took place in Kuala Lumpur, Manila, Beijing, Tokyo and Seoul in 2005-2007 and decided the selection criteria and processes of evaluating the journal and indexing articles. The Regional Journal Selection Committee (RJSC) provisionally approved the journals recommended by the Countries' respective National Journal Selection Committees and a total of 212 Journal titles are now for indexing by WPRIM, being 64 Chinese titles, 2 Japanese titles, 2 Mongolian titles, 13 titles from Philippines and 131 titles from the Republic of Korea . Copyright is one of hot issue for indexing and full text service at libraries. It would not be so easy to make journal articles freely accessible although it is important to increase number of open access journal titles. Bibliographic data and abstract information are key components of indexing on articles of scholarly journals. Currently there is no consensus on how to use abstract information when one would like to build a new indexing system with different audience, scope and purpose. I would like to emphasize the free use of abstract information in those instances which coincides with the public interest. It is also recommended however to support those who develop abstract information data for indexing. Practical process and conditions for this use would include a compulsory add of information of indexing data production to metadata and financial support to those who developed the key indexing data set.Creative Commons Kore

Eletrochemical Reduction of Titanium Dioxide 3-D Periodic Structures

The conversion of rutile (TiO 2 ) to TiO is carried out using a molten-salt electrochemical process known as the FFC method, which was suggested by Fray et al. In previous research, a dry-pressed rutile pellet is partially sintered and then electrochemically converted to Ti sponge. The Ti sponge can be crushed and sintered to produce a Ti billet for future machining operations. The guiding hypothesis of this research is that if the rutile is fabricated into a specific shape, the TiO 2 may be electrochemically converted to Ti directly while maintaining the desired shape. A three dimensional structure of TiO 2 is fabricated by robocasting, a process for assembling complex, three-dimensional (3-D) structures by extruding and patterning colloidal gels (pastes) followed by drying and sintering of the particles. Here, a TiO 2 paste is developed and evaluated by viscosity measurement. A 3-D lattice structure is fabricated using the robocasting method and the lattice structure is used as the feedstock for a molten CaCl 2 electrochemical reduction process. The reduction process is carried out using two different conditions. The control condition (the FFC method) uses a constant 3.2 V cell potential and allows current to vary as limited by the sample size and chemical reactions. The test condition is to maintain a constant current by varying the cell potential from 3.2 V to 4.2 V during the course of the electrochemical reaction. The control condition produces the expected chemical changes observed by others using the FFC method. The test condition yields an abundance of TiO nanofibers on the surface of the 3-D lattice. For both conditions, the reaction is terminated prior to conversion to Ti metal and the intermediate products are analyzed. The test condition consumes the CaCl 2 electrolyte. The electrolyte consumption is problematic for the notion of scale-up of this process, but the research produced some interesting TiO fibers that may prove worth the unfavorable reaction conditions. For instance, TiO fibers have not been reported in the literature, but may have application as catalysis material.School of Chemical Engineerin

A Daily Activity Monitoring System for Internet of Things-Assisted Living in Home Area Networks

In this paper, a daily activity monitoring system for Internet of Things (IoT)- assisted living in home area networks is proposed in order to provide care for elderly people who live alone. The proposed system consists of two main parts: an IoT-assisted living space with contactless activity sensors, a help trigger, and an emergency gateway and a daily activity monitoring server with a range of components including data collection, event and user management, activity analysis and reporting, and so on. The contactless activity sensors can be placed anywhere in the home, and the emergency gateway collects data from them, detects emergency situations reported through the help trigger, and communicates with the daily activity monitoring server. The server analyzes and reports the daily activities and activity patterns of elderly users using a predefined activity index. In addition, unexpected emergency situations can be estimated and prevented through analysis of the activity information

Impact of water on toxic hydrogen fluoride generation from the decomposition of LiPF6 in lithium-ion battery electrolytes

PresentationToxic hydrogen fluoride (HF) gas can be generated when LiPF6, a salt used in lithium-ion battery electrolytes, thermally decomposes and/or reacts with trace water. Simultaneous thermal analysis and mass spectrometry (STA-MS) was conducted on five different organic solvents containing LiPF6 to determine the temperatures at which HF is generated and the activation energies of the decomposition reaction. STA-MS allows the simultaneous direct observation of electrolyte thermal stability and hydrogen fluoride generation, something that is not possible with gas chromatography–mass spectrometry alone, thus it represents a more efficient and simple experimental approach. The five solvents tested in this study were anhydrous tetrahydrofurfuryl alcohol (THFA), 1,3- dioxolane (1,3-DL), diethyl carbonate (DEC), 1,2-dimethoxyethane (DME), and ethyl carbonate (EC). STA-MS analysis of the LiPF6 in these solvents revealed that HF generation occurred at different temperatures for each electrolyte. In the case of 1M LiPF6 in THFA, the addition of 1000 ppm of water reduced the thermal decomposition temperature compared to solid neat LiPF6. Except for EC, all of the other electrolyte systems exhibited a lower HF generation temperature and a lower reaction activation energy (Ea) when water was present. Additionally, from a risk assessment perspective, the results indicate that the HF generation starts from the SEI layer decomposition stage which occurs early in the thermal runaway mechanism of the lithium-ion battery. This research can be used to develop more thermally stable and safer electrolytes in the future, especially with respect to HF generation. In addition, this study highlights the need for research into measures to combat large-capacity lithium-ion battery fires, which may occur in electric vehicles and grid-scale energy storage systems

Post-hoc simulation study of computerized adaptive testing for the Korean Medical Licensing Examination

Purpose Computerized adaptive testing (CAT) has been adopted in licensing examinations because it improves the efficiency and accuracy of the tests, as shown in many studies. This simulation study investigated CAT scoring and item selection methods for the Korean Medical Licensing Examination (KMLE). Methods This study used a post-hoc (real data) simulation design. The item bank used in this study included all items from the January 2017 KMLE. All CAT algorithms for this study were implemented using the ‘catR’ package in the R program. Results In terms of accuracy, the Rasch and 2-parametric logistic (PL) models performed better than the 3PL model. The ‘modal a posteriori’ and ‘expected a posterior’ methods provided more accurate estimates than maximum likelihood estimation or weighted likelihood estimation. Furthermore, maximum posterior weighted information and minimum expected posterior variance performed better than other item selection methods. In terms of efficiency, the Rasch model is recommended to reduce test length. Conclusion Before implementing live CAT, a simulation study should be performed under varied test conditions. Based on a simulation study, and based on the results, specific scoring and item selection methods should be predetermined

Post-hoc simulation study of computerized adaptive testing for the Korean Medical Licensing Examination

Computerized adaptive testing (CAT) has been adopted in licensing examinations because it improves the efficiency and accuracy of the tests, as shown in many studies. This simulation study investigated CAT scoring and item selection methods for the Korean Medical Licensing Examination (KMLE). This study used a post-hoc (real data) simulation design. The item bank used in this study included all items from the January 2017 KMLE

Effect of Compressed Sensing Rates and Video Resolutions on a PoseNet Model in an AIoT System

To provide an artificial intelligence service such as pose estimation with a PoseNet model in an Artificial Intelligence of Things (AIoT) system, an Internet of Things (IoT) sensing device sends a large amount of data such as images or videos to an AIoT edge server. This causes serious data traffic problems in IoT networks. To mitigate these problems, we can apply compressed sensing (CS) to the IoT sensing device. However, the AIoT edge server may have poor pose estimation accuracy (i.e., pose score), because it has to recover the CS data received from the IoT sensing device and estimate human pose from the imperfectly recovered data according to CS rates. Therefore, in this paper, we analyze the effect of CS rates (from 100% to 10%) and video resolutions (1280×720, 640×480, 480×360) in the IoT sensing device on the pose score of the PoseNet model in the AIoT edge server. When only considering the meaningful range of CS rates from 100% to 50%, we found that the higher the video resolution, the lower the pose score. At the CS rate of 80%, we could reduce data traffic by 20% despite the degradation in pose score of less than about 0.03 for all video resolutions