• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1996.10a
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• pp.408-413
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• 1996

도시화가 빠른 속도로 진행되고 있는 우리나라에서도 철도에 대한 수송능력의 증대, 고속화등의 사회적 요구에 의하여 철도선로의 고가화가 충분히 예상된다. 그러나 소음문제를 생각할 경우, 고가선로에 있어서는 다른 선로와 달리 열차주행에 의한 전동음(rolling noise)과 더불어 주행열차에 의하여 가진된 고가구조체의 진동소음(이하 고가 구조물음)을 함께 고려하지 않으면 안된다. 따라서 본 논문에서는, 고가철도에서의 소음전파를 예측하기 위하여, 고가구조체로부터의 소음방사를 고려하는 실험적 검토를 하였다. 또한 실험결과를 근거로 하여 고가 구조 물음에 대한 음원모델을 설정하고, 전동음을 포함하는 소음전파 예측의 계산모델을 작성하여, 계산결과와 실측결과와의 대응성에 대하여 검토하였다.

• Nuclear Engineering and Technology
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• v.27 no.3
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• pp.439-446
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• 1995

원자력 발전소 안전성 향상을 위한 노력으로 현재 안전계통의 단순화및 피동화에 대한 연구가 활발히 지속적으로 수행되고 있다. 개량형 중수로에서는 특수 안전계통의 하나인 비상노심냉각계통의 피동화 및 단순화 방안을 다각적으로 검토한 결과, 비상노심냉각계통의 압력이 열수송계통(Heat Transport System) 압력보다 일정 크기 이상일 때만 파열되는 일방향파열판(One-way Rupture Disc)을 개발하여, 계통에 도입함으로써 전기적인 신호와 힘에 의해 작동되는 밸브 갯수를 크게 줄일 수 있게 되었고 이로 인해 계통의 피동성이 향상되었으며, 계통구성 측면이나 운전 측면에서도 단순화를 이루었다. 또한 물보다 비중이 작고 가스주입 차단 기능이 뛰어난 볼(Floating Ball)을 고압용 비상노심냉각 물탱크 내부에 설치하여 종래의 차단밸브 기능을 수행하게 함으로써 전동식 차단밸브를 제거할 수 있게 되었다.

• Restorative Dentistry and Endodontics
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• v.35 no.4
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• pp.267-272
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• 2010

Screw-in effect is one of the unintended phenomena that occurs during the root canal preparation with nickel-titanium rotary files. The aim of this study was to compare the screw-in effect among various nickel-titanium rotary file systems. Six different nickel-titanium rotary instruments (ISO 20/.06 taper) were used: $K3^{TM}$ (SybronEndo, Glendora, CA, USA), $M_{two}$ (VDW GmbH, Munchen, Germany), NRT with safe-tip and with active tip (Mani Inc., Shioya-gun, Japan), ProFile$^{(R)}$ (Dentsply-Maillefer, Ballaigues, Switzerland) and ProTaper$^{(R)}$ (Dentsply-Maillefer, Ballaigues, Switzerland). For ProTaper$^{(R)}$, S2 was selected because it has size 20. Root canal instrumentations were done in sixty simulated single-curved resin root canals with a rotational speed of 300 rpm and single pecking motion. A special device was designed to measure the force of screw-in effect. A dynamometer of the device recorded the screw-in force during simulated canal preparation and the recorded data was stored in a computer with designed software (LCV-USE-VS, Lorenz Messtechnik GmbH, Alfdorf, Germany). The data were subjected to one-way ANOVA and Tukey's multiple range test for post-hoc test. P value of less than 0.05 was regarded significant. ProTaper$^{(R)}$ produced significantly more screw-in effects than any other instruments in the study (p < 0.001). $K3^{TM}$ produced significantly more screw-in effects than $M_{two}$, and ProFile$^{(R)}$ (p < 0.001). There was no significant difference among $M_{two}$, NRT, and ProFile$^{(R)}$ (p > 0.05), and between NRT with active tip and NRT with safe one neither (p > 0.05). From the result of the present study, it was concluded, therefore, that there seems significant differences of screw-in effect among the tested nickel-titanium rotary instruments. The radial lands and rake angle of nickel-titanium rotary instrument might be the cause of the difference.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.11
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• pp.851-860
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• 2020

With an increase in the aging population and a rising social interest in health and welfare, studies to improve healthcare in the elderly are being actively conducted. This study attempted to improve the current design and manufacture of elevating electric wheelchairs to enhance user safety and convenience. Seat design based on the user's body shape, convenience while boarding or alighting, caster turning radius and, safety and stability features that prevent shaking when the user gets up or sits down were improved. A driving experiment was conducted to evaluate the operation of the indoor electric wheelchair designed and manufactured with these additional functionalities. During the test, the performance parameters evaluated were continuous driving time, turning radius, maximum lifting and lowering load, maximum lifting height, noise level, minimum distance sensing by the driving auxiliary sensor, ability to interact with server and app programs, and the duty cycle maximum error rate. The test confirmed that this improved electric wheelchair successfully met target parameters. In a future study, we will evaluate this improved electric wheelchair from a user's perspective for its usability parameters, such as satisfaction, convenience and stability.

• Journal of Korea Multimedia Society
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• v.15 no.2
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• pp.250-257
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• 2012

Recently oriental medicine has become a new issue in the global medical field because of increasing demands for the treatment of old people. Western medical equipment is becoming popular with big companies related to IT, communication and medical treatment. But globalization of oriental medicine techniques is inadequate due to lack of knowledge about oriental medicine. The cupping equipment has great growth potential because it is easy for old people to use the equipment. The purpose of this paper is to promote the portable multi electrical cupping system. The system may be used by patients themselves without any help from others. By using many cupping cups at the same time and regulating the timer and vacuum pressure. The patient can decrease itching and relax the hardened muscles. The system is expected to grow in the future as oriental medicine will be in high demand in aging society with IT convergence industry.

• Annual Conference on Human and Language Technology
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• 2023.10a
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• pp.437-442
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• 2023

최근에 등장한 대규모 언어 모델은 다양한 언어 처리 작업에서 놀라운 성능을 발휘하고 있다. 그러나 이러한 모델의 크기와 복잡성 때문에 모델 경량화의 필요성이 대두되고 있다. Pruning은 이러한 경량화 전략 중 하나로, 모델의 가중치나 연결의 일부를 제거하여 크기를 줄이면서도 동시에 성능을 최적화하는 방법을 제시한다. 본 논문에서는 한국어 언어 모델인 Polyglot-Ko에 Wanda[1] 기법을 적용하여 Pruning 작업을 수행하였다. 그리고 이를 통해 가중치가 제거된 모델의 Perplexity, Zero-shot 성능, 그리고 Fine-tuning 후의 성능을 분석하였다. 실험 결과, Wanda-50%, 4:8 Sparsity 패턴, 2:4 Sparsity 패턴의 순서로 높은 성능을 나타냈으며, 특히 일부 조건에서는 기존의 Dense 모델보다 더 뛰어난 성능을 보였다. 이러한 결과는 오늘날 대규모 언어 모델 중심의 연구에서 Pruning 기법의 효과와 그 중요성을 재확인하는 계기가 되었다.

• Science of Emotion and Sensibility
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• v.13 no.2
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• pp.317-326
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• 2010

The preparations for aging society are in progress at various fields while the related businesses are also actively in progress at each part of the society. At the same time, many countries that have entered aging society at an early stage are also solving various problems of the aging society by performing a continuous research on elderly industry. While disapproval could be generally called an emotional attitude formed over a long period of time from experience, how this disapproval is shown in elderly group and general public group has been investigated. Through the research, we could see that disapproval is shown as formative disapproval and semantic disapproval while it could be seen that a more sensitive reaction is shown toward semantic disapproval than formative disapproval in the silver group and people reacted to both semantic disapproval and formative disapproval in the general public group. Using these results, a hypothesis was set up and as a step to verify this hypothesis, an electric wheelchair for elderly to perform verification of the hypothesis. Through this study, we have attempted to present a design development methodology to reduce a sense of disapproval toward elderly group of people and prepare for the aging society to come in the future by setting the design objectives.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.11
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• pp.7957-7963
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• 2015

R&D trend for Auxiliary Power Supply(APU) of electric vehicle can be well understood by analyzing patents at home and abroad. Based on this trend analysis, domestic technology development direction is proposed. To get technique trend, patents of Korea, Japan, Europe and America published until February of 2014 are analyzed by WIPS DB. First, power converter and transformer two big category are classified. Power converter can be classified into resonant DC to DC converter and resonant Half bridge inverter; transformer can be classified into high frequency transformer, ferrite transformer and matching transformer. By analyzing R&D trend of different counties, companies and years, specific technology needed to be developed and trend of technology can be accurately grasped.

• Journal of Digital Convergence
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• v.19 no.2
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• pp.425-431
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• 2021

The purpose of this study is to compare and analyze leading brands of the scooter-sharing system market of Korea, KICKGOING and Lime, in terms of user experience, and to suggest the improvement direction of the applications and scooters of those two services. The assessment was conducted in such a way that the experimental group using scooter-sharing system over a certain frequency would choose the specific service they use most frequently, and complete a questionnaire: based on the reorganized version of the Peter Morville's Honeycomb Model. Based on the results of the experiment, We drew a conclusion that the services need to add navigation features in the application, to provide more simple procedures for reporting breakdown or accident and browsing insurance information, and to improve the user and pedestrian safety levels by gamification, et cetera. We expect this study to help the fast-growing smart mobility market and scooter-sharing systems that represent the market develop into a user-centered way.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2009.11a
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• pp.115-118
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• 2009

고령화 사회를 맞이하여 다양한 실버제품들이 이들을 위해 출시되고 있으나, 이들이 느끼는 실버 제품의 거부감에 대한 연구는 부족한 실정이다. 이를 위해 사전에 연구된 실버 제품의 거부감에 대한 연구를 바탕으로 그 가설을 검증하도록 한다.