• Journal of Power Electronics
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• v.18 no.3
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• pp.931-943
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• 2018

Wireless power transfer (WPT) technology has been the focus of a lot of research due to its safety and convenience. The Z-source inverter (ZSI) was introduced into WPT systems to realize improved system performance. The ZSI regulates the dc-rail voltage in WPT systems without front-end converters and makes the inverter bridge immune to shoot-through states. However, when the WPT system is combined with a ZSI, the system parameters must be configured to prevent the ZSI from entering an "accidental shoot-through" (AST) state. This state can increase the THD and decrease system power and efficiency. This paper presents a mathematical analysis for the characteristics of a WPT system and a ZSI while addressing the causes of the AST state. To deal with this issue, the impact of the system parameters on the output are analyzed under two control algorithms and the primary compensation capacitance range is derived in detail. To validate the analysis, both simulations and experiments are carried out and the obtained results are presented.

• KIPS Transactions on Computer and Communication Systems
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• v.4 no.6
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• pp.197-204
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• 2015

Recent changes in health care environment including aging population and prevalence of chronic disease encourage the adoption of new innovative technological solutions including wearable vital sensors, wireless networks, and smart phone. In this paper, we present an effective at-home lifestyle monitoring system that can be used for self-management and health intervention of patient himself in the Management-by-Exception perspectives. We implemented the filtering and queuing algorithms as a preprocessor of monitoring system to enhance efficiency of proposed system, and the effective UX design for self-management of patients themselves. The 94,467 actual clinic data was used to test the efficiency of the proposed system. As as a result, 64.8% of the incoming vital data was identified to be filtered out.

• Journal of The Korean Dental Society of Anesthesiology
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• v.13 no.4
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• pp.179-188
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• 2013

Background: Today, there are computer controlled local anesthesia devices used clinically. The main principle is to control injection speed by computer aided system, and it relieves pain. However, there are few objective data considering this subject. In this literature review, we researched studies about computer controlled anesthetic delivery. We compared pain control effect of computer controlled to conventional local anesthetic syringe system. Methods: A bibliographic search in PubMed was performed and we reviewed original articles. Results: There were 18 publications that compared pain control effect of computer controlled to conventional system. There were 8 articles reported of children, similar pain control effect was found in 7 of them. One study showed superior pain control effect of computer controlled anesthetic delivery. For adults, 10 studies showed superior pain control effect in computer aided system. Conclusions: Computer controlled anesthetic delivery has similar or superior pain control effect compared to conventional local anesthetic syringe system. For both children and adults, computer controlled anesthetic delivery could be clinically useful, still it may be more effective for adults.

• Korean Journal of Oriental Medicine
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• v.9 no.1
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• pp.1-33
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• 2003

From the study on Doo-Jong Kims view of history about the early Korea$(Korea\;herewith\;stands\;for\;Korea\;dynasty\;A.D.918{\sim}1392)s$ Medicine, I came to a conclusion as follows. 1. Doo-Jong Kim is stressing on the fact that Early Koreas Medicine inherited from Shilla dynasty and seemingly expressing the pride of national medical science. But actually he distorted the Koreas independent growth with flunkeyism and insisted that Koreas medicine only took over Shilla dynastys which based on Chinese Tang dynastys medical science. As a result, Koreas medicine was blurred and evaluated as nothing but Tangs medicine. But, the reasons of Doo-Jong Kims viewpoints were not based on the fact, but on his speculation. 2. About the medical system, Doo-Jong Kim viewed that Korea copied Chinese Soo & Tangs medical system, But the fact is that Korea only borrowed a part of Chinese medical systems name, for examples, Tae-I-Gam, Sang-Yak-Kook, Sang-Sik-Kook, etc., and its actual functions were different and grew in Koreas own way, As a result, the titles or roles in the system were very different from those of Chinas. Especially, Korea saw much development in Science of Acupuncture and Moxibustion that there was a specialist on Acupuncture, called I-Chim-Sa, and even had much influences on Chinese Acupuncture and Moxibustions growth, exporting Hwang-Je-Ne-Kyong to Chinese Song dynasty. 3. About the education system of medicine, Doo-Jong Kim viewed that Koreas medicine was only a copy of Shilla dynastys which was based on Chinese Tang dynastys, taking the medical examination curriculum as an example. The fact is that Tangs medical curriculum was three, Bon-Cho, Kab-Ul, Maek-Kyong, Shilla had seven, Bon-Cho-Kyong, Kab-Ul-Kyong, So-Moon-Kyong, Chim-Kyong, Maek-Kyong, Myong-Dang-Kyong, Nan-Kyong, and Korea had ten, So-Moon-Kyong, Kab-Ul-Kyong, Bon-Cho-Kyong, Myong-Dang-Kyong, Maek-Kyong, Dae-Kyong-Chim-Kyong, Nan-Kyong, Ku-Kyong, Ryu-Yon-Ja-Bang, So-Kyong-Chang-Jeo-Ron. Simply considering this, it is so clear that Koreas medical curriculum was much more upgraded one than that of China. 4. About the examination system for civil service, Doo-Jong Kim expressed that Shilla dynasty did not have such system, and only expounded knowledge of Shilla medicine, In case of China, Tang danasty Hyang-Kong was only a qualification test for civil service, which the result was completely dependent on applicants social status, Song danasty examination system was composed of three steps of Hyang-Si, Sung-Si, Jeon-Si (See Note1), but it stuck to formality by having Jeon-Si of anti-fraudulence use. On the other hand, examination system for civil service in Korea dynasty started in 958 by an advice of Ssang-Ki, Chin-Si in 977 and K대-Ja-Si (See Note 1), a kind of Hyang-Si, in 1024., Three steps of examination system made employment for civil service strictly fair, Moreover, it was possible for offsprings of concubine to be an applicant. These easily explain that the examination system of Korea dynasty was more upgraded one than that of China, Tang ＆ Song dynasty. Hyang-Si : Exam in local area Sung-Si : Exam in province for those who passed Hyang-Si Jeon-Si : Exam held with Koea Kings supervision for those who passed Hyang-Si Keo-Ja-Si : Selective exam in local area like Hyang-Si. From the reasons above, it is clear that Doo-Jong Kim was much biased by flunkeyism through Japanese colonialisam and expressed his view on Korea Medical History based on such theory of heteronomy and stasis. Moreover, without rigid historical evidence on records, he distored the fact by translating incorrectly on his purpose. Therefore, Doo-Jong Kims Korean Medical History must be reevaluated through rigid historical research and his mistranslation should be corrected.

• Journal of the korean academy of Pediatric Dentistry
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• v.34 no.3
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• pp.513-518
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• 2007

Loss of multiple teeth by multiple dental caries, traumatic influence or hereditable disease can cause many problem in children. Using removable appliance can be used for treatment of this problem. But conventional removable appliance has limits of retention by wire-clasp, non esthetic appearance, difficulty in pronunciation by its volume. Flexible denture using $Valplast^{(R)}$ system could be a excellent partial denture for restorarion in child because of various advantage such as retention from soft tissue, natural esthetic aspect, biocompatibility, durability to compare with conventional acrylic appliance. The present case report describe properties and consideration of flexible denture using Valplast $system^{(R)}$ in comparison with conventional acrylic appliance and report successful restoration of child using Valplast $system^{(R)}$.

• Earthquakes and Structures
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• v.10 no.6
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• pp.1253-1272
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• 2016

For a nonlinear control system, there are many uncertainties, such as the structural model, controlled parameters and external loads. Although the significant progress has been achieved on the robust control of nonlinear systems through some researches on this issue, there are still some limitations, for instance, the complicated solving process, weak conservatism of system, involuted structures and high order of controllers. In this study, the computational structural mechanics and optimal control theory are adopted to address above problems. The induced norm is the eigenvalue problem in structural mechanics, i.e., the elastic stable Euler critical force or eigenfrequency of structural system. The segment mixed energy is introduced with a precise integration and an extended Wittrick-Williams (W-W) induced norm calculation method. This is then incorporated in the market-based control (MBC) theory and combined with the force analogy method (FAM) to solve the MBC robust strategy (R-MBC) of nonlinear systems. Finally, a single-degree-of-freedom (SDOF) system and a 9-stories steel frame structure are analyzed. The results are compared with those calculated by the $H{\infty}$-robust (R-$H{\infty}$) algorithm, and show the induced norm leads to the infinite control output as soon as it reaches the critical value. The R-MBC strategy has a better control effect than the R-$H{\infty}$ algorithm and has the advantage of strong strain capacity and short online computation time. Thus, it can be applied to large complex structures.

• The Journal of Korean Academy of Prosthodontics
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• v.44 no.1
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• pp.51-62
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• 2006

Purpose: The purpose of this study was to evaluate the pattern and the magnitude of stress distribution in the supporting tissues surrounding three different types of implants(ITI, 3i. and Bicon implant system) Material and method: Photoelastic models were made with PL-2 resin(Measurements Group, Raleigh, USA) and three implants of each kind were placed in the mandibular posterior edentulous area distal to the canine. For non-splinted restorations, individual crowns were fabricated on three titanium abutments. For splinted restorations, 3-unit axed partial dentures were fabricated. Photoelastic stress analyses were carried out to measure the fringe order around the implant supporting structure under simulated loaded conditions(15 lb. 30 lb). Conclusion: The results were as follows; 1 Regardless of the implant design, stresses were increased in the apex region of loaded implant when non-splinted restorations were loaded. While relatively even stress distribution occurred with splinted restorations. Splinting was effective in the second implant. 2. Strain around Bicon implant were lower than those of other implants, which confirmed the splinting effect. The higher the load, the more the stress occurred in supporting tissue, which was most obvious in the Bicon system. 3. Stress distribution in the supporting tissue was favorable in the ITI system. while the other side of 3i system tended to concentrate the stress in some parts.

• Geomechanics and Engineering
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• v.25 no.3
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• pp.233-243
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• 2021

Rib spalling is a major issue affecting the safety of steeply inclined coal seam. And the failure coal face and support system can be affected with each other to generate a vicious cycle along with inducing large-scale collapse of surrounding rock in steeply inclined coal seam. In order to analyze failure mechanism and propose the corresponding prominent control measures of steeply inclined coal working face, mechanical model based on coal face-support-roof system and mechanical model of coal face failure was established to reveal the disaster mechanism of rib spalling and the sensitive analysis of related factors was performed. Furthermore, taking 3402 working face of Chen-man-zhuang coal mine as engineering background, numerical model by using FLAC3D was built to illustrate the propagation of displacement and stress fields in steeply inclined coal seam and verify the theory analysis as mentioned in this study. The results show that the coal face slide body in steeply inclined working face can be observed as the failure height of upper layer smaller than that of lower layer exhibiting with an irregular quadrilateral pyramid shape. Moreover, the cracks were originated from the upper layer of sliding body and gradually developed to the lower layer causing the final rib spalling. The influence factors on the stability of coal face can be ranked as overlying strata pressure (P) > mechanical parameters of coal body (e.g., cohesion (c), internal fraction angle (φ)) > support strength (F) > the support force of protecting piece (F') > the false angle of working face (Θ). Moreover, the corresponding control measures to maintain the stability of the coal face in the steeply inclined working face were proposed.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06a
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• pp.71-73
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• 2012

최근 웹 2.0과 시맨틱 웹의 대중화와 더불어 Open API와 링크드 데이터를 이용한 시맨틱 웹 융복합(매쉬업) 서비스가 주목을 받고 있다. 다양한 링크드 데이터와 Open API들을 조합함으로써 새로운 서비스들을 쉽고 빠르게 만드는 것이 가능하기 때문이다. 하지만 사용자가 링크드 데이터와 Open API 서비스를 사용하기 위해서는 서비스 입력 값이나 출력값 등의 해당 정보를 얻어야 하며 이를 위해 링크드 데이터와 Open API를 제공해 주는 사이트를 직접 방문해야만 하는 불편함을 가지게 된다. 본 논문에서는 시맨틱 웹 매쉬업 서비스를 위한 통합 링크드 데이터 및 Open API 관리 시스템을 설계하고 구현하였다. 제안한 시스템에서 사용자는 사전 지식 없이 통합 관리 시스템을 통해 원하는 링크드 데이터와 Open API 서비스를 검색하고 실행할 수 있다. 또한 실행된 결과는 XML 형태로 저장되어 추후 매쉬업 시 재사용이 가능하도록 한다.

• Structural Engineering and Mechanics
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• v.48 no.4
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• pp.435-453
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• 2013

A new computational approach for the rain load on the transmission tower is presented to obtain the responses of system subjected to the wind and rain combined excitations. First of all, according to the similarity theory, the aeroelastic modeling of high-voltage transmission tower is introduced and two kinds of typical aeroelastic models of transmission towers are manufactured for the wind tunnel tests, which are the antelope horn tower and pole tower. And then, a formula for the pressure time history of rain loads on the tower structure is put forward. The dynamic response analyses and experiments for the two kinds of models are carried out under the wind-induced and wind-rain-induced actions with the uniform and turbulent flow. It has been shown that the results of wind-rain-induced responses are bigger than those of only wind-induced responses and the rain load influence on the transmission tower can't be neglected during the strong rainstorm. The results calculated by the proposed method have a good agreement with those by the wind tunnel test. In addition, the wind-rain-induced responses along and across the wind direction are in the same order of response magnitude of towers.