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비규격 스틸커튼월 부재의 적용을 위한 로봇 레이저용접 성능에 관한 연구
나상호 ( Na¸ Sangho ),이장현 ( Lee¸ Janghyun ),박영미 ( Park¸ Youngmi ),김성진 ( Kim¸ Sungjin ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
In irregular curtain walls, the nominal stress required for each member varies greatly depending on the shape, so it is inefficient to design members based on the maximum required stress. Then, built-up members are absolutely necessary, but built-up members manufactured by Manpower-welding cannot be constructed in an irregular curtain wall building because it' not precise. In order to address the problems, this paper presents why Robotic-laser-welding should be used in irregular curtain walls using Gwanggyo Galleria Department Store involving 3D printing as an example. Results verify the performance of Robot-Laser-Welding as an efficient solution for precise steel curtain wall members.
Geometric and magnetic properties of Co adatom decorated nitrogen-doped graphene
Lee, Sangho,Lee, Minho,Chung, Yong-Chae American Institute of Physics 2013 JOURNAL OF APPLIED PHYSICS - Vol.113 No.17
<P>The potential for nitrogen doped graphene with dispersed Co metal atoms as a candidate material for future spintronic applications was studied using first-principles calculations. Among the three types of defective structures, the pyridinic and pyrrolic systems were demonstrated to be structurally stable since the binding energy between the Co adatom and these substrate layers exceeded the cohesive energy of Co metal alone. Also, Co adatom on these two structures showed high magnetic moment values, which surpassed that of the Co metal bulk. From these results, it is shown that the pyridinic and pyrrolic N defects on graphene have a positive effect on the geometric stability and magnetic property of decorated Co atoms. (C) 2013 American Institute of Physics.</P>
Automatic Model-Based Soft Sensor Generation for Liquefied Natural Gas Terminal Pipeline
Lee, Sangho,Jung, Jaehum,Park, Chansaem,Lee, Ung,Han, Chonghun American Chemical Society 2014 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.53 No.39
<P>A liquefied natural gas (LNG) receiving terminal is a facility to receive, store, and produce natural gas to demand. In the terminal, there are many pipelines that carry LNG, which is dangerous when it evaporates, but the number of sensors are not sufficient to monitor the property of fluids at all position of pipeline because of the cost of sensors. To solve the data insufficiency problem, a methodology for automatic model-based soft sensor generation is proposed in this paper. This methodology is composed of positional information extraction, automatic model formulation, and simulation with minimum errors. With the software based on this methodology, even the user who does not have a chemical or mathematical background can monitor the fluid property at whole terminal pipelines. For validation, the methodology is applied to an LNG terminal unloading pipeline, and it showed good accuracy and accessibility of various data types.</P>
Sangho Sohn,Yeonjoo Seo,Yunsik Jeong,Seungwoo Lee,Jeesun Lee,이경주 한국보건의료인국가시험원 2021 보건의료교육평가 Vol.18 No.-
Purpose: In 2015, the South Korean government legislated the Act for the Improvement of Training Conditions and Status of Medical Residents (Medical Resident Act). This study investigated changes in the working and learning environment pre- and post-implementation of the Medical Resident Act in 2017, as well as changes in training conditions by year post-implementation. Methods: An annual cross-sectional voluntary survey was conducted by the Korean Intern Resident Association (KIRA) between 2016 and 2019. The learning and working environment, including extended shift length, rest time, learning goals, and job satisfaction, were compared by institution type, training year, and specialty. Results: Of the 55,727 enrollees in the KIRA, 15,029 trainees took the survey, and the number of survey participants increased year by year (from 2,984 in 2016 to 4,700 in 2019). Overall working hours tended to decrease; however, interns worked the most (114 hours in 2016, 88 hours in 2019; P<0.001). Having 10 hours or more of break time has gradually become more common (P<0.001). Lunch breaks per week decreased from 5 in 2017 to 4 in 2019 (P<0.001). Trainees’ sense of educational deprivation due to physician assistants increased from 17.5% in 2016 to 25.6% in 2018 (P<0.001). Awareness of tasks and program/work achievement goals increased from 29.2% in 2016 to 58.3% in 2018 (P<0.001). Satisfaction with the learning environment increased over time, whereas satisfaction with working conditions varied. Conclusion: The Medical Resident Act has brought promising changes to the training of medical residents in Korea, as well as their satisfaction with the training environment.
Evaluation System for Defense IT Project in Korea: Post-Implementation Stage
Lee, Sangho,Song, Chong-Hyun Korea Multimedia Society 2018 The journal of multimedia information system Vol.5 No.4
Performance measurement is not an easy task. However, it is necessary to measure the expected value of the informatization project to be invested, to help the successful progress of the informatization project, and to confirm the result of the informatization project. This study describes the evaluation systems of the defense informatization project in Korea used after the end of the informatization project (post-implementation evaluation stage). In the post-implementation evaluation stage of proposed system, the informatization project is evaluated in terms of performance achievement, project plan compliance, project management, and economic validity. For each element, this study suggests metrics and practical measurement method. With metrics and their method, it can be evaluated which project is better than others. Moreover, the lessons learned can be developed. Under scarce budget condition, defense organizations can make better performance from IT project with the evaluation system suggested in this study.
Comparable mono and bipolar connection of capacitive deionization stack in NaCl treatment
Lee, Jae Kwang,Kim, Ye Eun,Kim, Jongwon,Chung, Sangho,Ji, Dukjin,Lee, Jaeyoung Elsevier 2012 Journal of industrial and engineering chemistry Vol.18 No.2
<P><B>Abstract</B></P><P>In this study, multiple cells of capacitive deionization (CDI) stack were designed in mono-polar and bipolar for a comparison study regarding voltage distribution. The repetitive sorption and regeneration process are conducted to investigate the recycling behavior. Higher removal efficiency is obtained and carbon electrodes are slowly saturated by ions from the CDI stack connected in mono-polar than that in bipolar. Durability of CDI was demonstrated in both bi- and mono-polar systems. Finally, optimized condition of the cell structure and operation design for efficient removal of ions and energy saving are extensively introduced.</P>