Categorization of ICT Utilization in Education Challenges in Indonesia Based on Four Categories of ICT Utilization Challenges: Policy, Infrastructure, Curriculum-Contents and Human Resources

Kim YoungHwan,Ahmad Nur Fadli APEC국제교육협력원 2014 Asia-Pacific Cybereducation Journal Vol.10 No.2

As an economy with archipelago contour and one of the largest populations in the world, Indonesia faces specific challenges in utilizing ICT for education nationwide. The present study provides a systematic categorization of such challenges into four categories based on Kim YoungHwan’s categorization of ICT utilization challenges, and then breaks down such categories into more explanatory sub-categories, along with order of frequency. Hence, this study aims at systematically describing challenges in utilizing ICT in Indonesia.

Trade and Strategic Trade Policy in the Case of Spillover Learning-by-Doing

Young-Hwan,Lee,Sung-Kyu,LEE 한국무역학회 2007 Journal of Korea trade Vol.11 No.3

We consider the optimal subsidy policy under different assumptions on the firms and government s behaviors: precommitment equilibrium and sequential equilibrium. In the presence of spillover learning-by-doing, positive subsidies may not be justified when the home firm behaves strategically against the foreign firm and the home government. The home firm has additional incentives to increase output in the first period: through the pure learning ‐-by-doing effect, strategic effect against the foreign firm, strategic effect against the home government, and inward spillover effect. This implies that the home firm has an incentive to utilize pure learning -by-doing to improve the home firm s future strategic position in competition with the foreign firm, to increase the subsidy, and to benefit from the inward spillovers. On the other hand, the home government has an incentive to offset the strategic behaviors by the home firm: to offset the home firm in the first period to restrain home firm from over-producing strategically against the foreign firm and against the home government, and to reduce inward spillover effect.

A Study on CC (Common Criteria) Evaluation Criteria for Side Channel Analysis

Young-Hwan,Bang,Kab-Seung,Kou,Gang-Soo Lee 보안공학연구지원센터 2009 보안공학연구논문지 Vol.6 No.1

슈-트리 풋 헬스케어 디바이스 개발 연구

김영환(주저자) ( Kim Younghwan(주저자) ),김영환(교신저자) ( Kim Younghwan(교신저자) ) 디자인융복합학회 2023 디자인융복합연구 Vol.22 No.6

인간의 문명사회에서 필수적으로 착용하는 제품인 신발은 오랜 시간 동안 착용하고 걸어 다니면서 신발의 내부가 족부에서 발생하는 땀 그리고 세균으로 오염되며, 발을 감싸고 있는 구조적 한계점으로 인해 내부 통풍이 원활하지 않다. 이에 본 연구는 슈 트리 풋 헬스케어 디바이스를 개발하여 족부에 의해 오염된 신발의 내부 환경을 쾌적하고 청결하게 만듦으로써 사용자의 족부 건강 증진 및 삶의 질 개선에 목적을 두고 있다. 해당 디바이스 개발을 위해 한국인 및 전 세계 남성의 평균 발 크기를 조사하였으며, 이를 통해 신발 형태의 왜곡 방지와 세균 및 습기 제거가 용이한 디바이스를 개발하였다. 본 디바이스는 전·후면 두 조각으로 구성되며, 전면부는 살균 및 건조의 기능이 있는 UV LED와 모터 및 날개로 구성되어 있고, 후면부는 습도표시부와 제어부로 구성된다. 본 디바이스의 사용성 실험결과, 1시간 30분 만에 72%의 습도에서 31%까지 낮춘 데 반해, 전통적인 슈 트리는 동일한 시간 동안 42%에 머물러 본 연구에서 개발한 디바이스의 활용성을 검증하였다. 본 연구에서는 전통적인 슈-케어 방법과 첨단 기능을 통한 방법으로 족부 건강에 도움이 될 수 있는 다기능 융복합 디바이스를 개발하였다. Footwear, a crucial element of contemporary life, often traps sweat and harbours bacteria due to limited ventilation during prolonged use. This study introduces the Shoe-Tree Foot Healthcare Device, meticulously designed to establish a hygienic environment within shoes contaminated by foot-related elements, ultimately promoting overall well-being. The development of this device involved a comprehensive global·national survey focusing on average foot sizes among men. It was engineered to counter structural shoe distortions while efficiently eliminating bacteria and moisture. Comprising front and rear sections, the front segment integrates a UV LED for sterilization and drying, along with a motor equipped with a fan. Simultaneously, the rear section features a humidity display and a control module. Empirical testing demonstrated a remarkable 31% reduction in humidity within 1 hour and 30 minutes, surpassing the 42% achieved by traditional shoe-trees. This research has yielded a versatile device, merging traditional shoe-care practices with cutting-edge technology for comprehensive foot-care.

Optimal Design of Body Profile for Stable Stair Climbing Via Tri-wheels

Younghwan Kim,Donghan Son,Jeongpil Shin,TaeWon Seo 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.12

In this paper, we propose a mobile robot platform that is an improved form of LEVO. The LEVO uses a regular wheel and curved spoke triwheel(CSTW) system to drive flat terrain and stair climbs. However, this robot has problems when climbing stairs: it’s bottom profile collides with the stairs, resulting in huge jerk. To solve this problem, in this study, attempts to reduce the jerk value by applying a blade using a B-spline to the bottom profiles where the robot collides with the stairs. At this time, by reducing jerk, it can contribute to extending the life of the robot and improving driving stability. This study involved two steps. First, simulation was performed by adjusting the number and position of control points of the curve (B-spline). In this process, the orthogonal arrangement was applied among the optimal design techniques to finally reduce the jerk value by 92% and the driving torque needed to climb the stairs by 9.5%. At this time B-spline has one control point and the position is (300, 15). This simulation result was verified experimentally using a test bench and a prototype robot. As a result, it was confirmed that the jerk was reduced by 66.7%. Simulations and experimental verification based on them have shown that the proposed method is sufficiently effective in real environment.

A Numerical Approach on Internal Drag for High Speed Air-Breathing Vehicle in Wind Tunnel Test

Younghwan Lee,Hyeon Jin 한국전산유체공학회 2022 한국전산유체공학회 학술대회논문집 Vol.2022 No.10

A Novel Way of Storage and Recycling of the Context Information Data

Younghwan Oh 보안공학연구지원센터 2013 International Journal of Smart Home Vol.7 No.5

A Programmable Impedance Tuner With Finite SWRs for Load-Pull Measurement of Handset Power Amplifiers

Younghwan Bae,Unha Kim,Junghyun Kim THE INSTITUTE OF ELECTRICAL ENGINEERS 2015 IEEE Microwave and Wireless Components Letters Vol. No.

<P>A novel coupler/reflection-type electronic impedance tuner is proposed with quantitative analysis. The tuner is divided into a magnitude part and a phase part, and the magnitude and phase of the tuner impedance can be controlled separately just with one design parameter, respectively, thus facilitating programmable control for constant magnitude and uniform phase distribution. The tuner with standing wave ratio (SWR) = 2.5 and 6 was implemented for 3G/4G handset low-band transmitter (Tx) power amplifier (PA) load-pull measurement. The fabricated tuner showed very uniform reflection coefficient distribution with magnitude deviations of less than 0.05/0.08 at SWR = 2.5 / 6 and phase deviations of less than 5 <SUP>°</SUP>. PA load-pull measurement result using the tuner showed good agreement with a mechanical tuner, thus verifying the practical usefulness of the proposed tuner.</P>

Analysis and Design of Rod Extractor and Cutter for Spent Fuel Assembly Dismantling in Head-End

Younghwan Kim,SunSeok Hong,Seckmin Hong,JuHo Lee,JaeWon Lee,ChangHwa Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1

An important goal of dismantling process is the disassembling of a spent nuclear fuel assembly for the subsequent extraction process. In order to design the rod extractor and cutter, the major requirements were considered, and the modularization design was carried out considering remote operation and maintenance. In order to design the rod extractor and cutter, these systems were analyzed and designed, also the concept on the rod extraction and cutting were considered by using the solid works tool. The main module consists of five sub-modules, and the function of each is as follows. The clamping module is an assembly fixing module using a cylinder so that the nuclear fuel assembly can be fixed after being placed. The Pusher module pushes the fuel rods by 2 inches out of the assembly to grip the fuel rods. The extraction module extracts the fuel rods of the nuclear fuel assembly and moves them to the consolidation module. The consolidation module collects and consolidates the extracted fuel rods before moving them to the cutting device. And the support module is a base platform on which the modules of the main device can be placed. The modules of level 2 can be disassembled or assembled freely without mutual interference. For the design of fuel rods cutter, the following main requirements were considered. The fuel rod cut section should not be deformed for subsequent processing, and the horizontally mounted fuel rods must be cut at regular intervals. The cutter should have the provision for aligning with the fuel rod, and the feeder and transport clamp should be designed to transfer the fuel rods to the cutting area. The main module consists of 6 sub-modules, and function of each is as follows. The cutting module is a device that cuts the fuel rods to the appropriate depth for notching. The impacting module is a device that impacts the fuel rods and moves them to the collection module. The transfer module is a device that moves the fuel rods to the cutting module when the aligned fuel rods enter the clamp module. The clamping module is a device to clamp the fuel rods before moving them to the cutting module. The collection module is a container where the rod-cuts are collected, and the support module is a base platform on which the modules of the main device can be placed. The module of level 3 can be disassembled or assembled after the cutting module of level 2 is installed, and the modules of level 2 can be disassembled or assembled freely without mutual interference.

Analysis on Disassembling Methods of Nozzle for PWR Spent Fuel

Younghwan Kim,Yungzon Cho,Youngsoon Lee 한국방사성폐기물학회 2017 한국방사성폐기물학회 학술논문요약집 Vol.2017 No.05