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.

[Original Paper] Control Signal Reconstruction of Non-Linear Systems with Noise Using Neural Networks

Younghwan An(안영환) 한국소음진동공학회 1999 소음 진동 Vol.9 No.4

Corrosion Behavior Analysis of Ni-Cr Alloy in Molten NaCl-MgCl2 With Various Metallic Chloride at 973 K

Younghwan Jeon,Jungho Hur,Jaeyeong Park 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2

Attempts to use the molten salt system in various aspects such as MSR or energy storage systems are increasing. However, there are limitations in the molten salt-assisted technique due to the harsh corrosiveness of the molten salt, and a more detailed study on salt-induced corrosion is needed to solve this problem. In this study, corrosion behaviors of 80Ni-20Cr alloy in various salt environments such as eutectic NaCl-MgCl2 with NiCl2, CrCl2, and EuCl3 additives were investigated. Meanwhile, the corrosion acceleration effects of 80Ni-20Cr specimens were analyzed for various ceramic materials such as SiC, Al2O3, SiO2, graphite, and BN, and metallic materials such as Ni-based alloy, Fe-based alloy, and pure metals in a molten salt environment. The experiments were conducted at 973 K for up to 28 days, and after the experiment, the microstructural change of the specimen was analyzed through SEM-EDS, and salt condition was analyzed by ICP-OES.

The Implementation of IAPP Server Using Diameter Protocol

YoungHwan Ham,ByungHo Chung,KyoIl Chung 대한전자공학회 2004 ITC-CSCC :International Technical Conference on Ci Vol.2004 No.7

A Study on Secure Interaction of DHCP Server with DNS Server

YoungHwan Ham,BbyungHo Chung,Kyoll Chung 대한전자공학회 2004 ICEIC:International Conference on Electronics, Inf Vol.2004 No.8

Analysis and Design of Mechanical Decladding for Spent Fuel in Head-End

Younghwan Kim,SunSeok Hong,Seokmin Hong,JuHo Lee,JaeWon Lee,ChangHwa Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2

The PRIDE scale mechanical decladder is decladding apparatus for separating and recovering fuel material and cladding hull by horizontally slitting rod-cut. In order to enhance mechanical decladdng efficiency, the main requirements were considered as follows. Decladding of the fuel rods may be performed by rotation of three circular cutting blades inserted among the rollers arranged at 120° portion. In a mechanical decladder, a slitting assembly as a unit for slitting the cladding tube may include cutting blades for slitting and rollers for guiding extrusion of the cladding tube. Rotation of the cutting blades may be caused by the fuel rods being extruded from a plurality of rollers. Slitting intervals of rod-cuts having different diameters may be controlled by adding or removing a spacing plate between the cutting blade and a ranch bolt for fixing the slitting blade to the slitting assembly. An extrusion velocity with respect to the fuel rods may be controlled by a hydraulic pressure applied to the fuel rods. A force for cutting the fuel rods may be adjusted by controlling steel plates. Forces applied to a plurality of rollers may be generated by the hydraulic cylinder. The hydraulic pressure may be controlled by hydraulic pressure controller. The PRIDE scale mechanical decladder mainly consists of auto feeding module, hydraulic cylinder module and blade module. A load cell was installed between the hydraulic cylinder and the extrusion pin to measure the decladding force and slitting velocity, and a data acquisition system capable of obtaining data by using the RSC 232 was constructed. Also, the control panel can control the forward and backward movement of the extrusion pin, the hydraulic flow rate, and the hydraulic velocity. In the mechanical decladding test, 40 pieces of simulated rod-cuts were loaded in two auto feeding basket and slit by utilizing the 3-CUT blade modules in the housing, and hulls and simulated pellets were collected in the collection container. As a result, 80 pieces of simulated rodcut (brass pellets + Zry4 tube) were slit continuously without any problem. About 35 min was required to slit 80 rod-cuts and average decladding force was 260 kg. The decladding force of the ceramic simulated rod-cuts (castable) requires 25 kg less force than the brass pellets. Therefore, it is estimated that the spent fuel rod-cut can be fully split into three pieces using the mechanical decladder.

Analysis and Design of Down Ender and Dismantler for Spent Fuel Assembly Dismantling in Head-End

Younghwan Kim,SunSeok Hong,Seckmin Hong,JuHo Lee,JaeWon Lee,ChangHwa Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2

Dry head end process is developing for pyro-processing at KAERI (Korea Atomic Energy Research Institute). Dry processes, which include disassembling, mechanical decladding, vol-oxidation, blending, compaction, and sintering shall be performed in advance as the head-end process of pyro-processing. Also, for the operation of the head-end process, the design of the connecting systems between the down ender and the dismantling process is required. The disassembling process includes apparatus for down ender, dismantling of the SF (Spent Fuel) assembly (16×16 PWR), rod extraction, and cutting of extracted spent fuel rods. The disassembling process has four-unit apparatus, which comprises of a down ender that brings the assembly from a vertical position to a horizontal position, a dismantler to remove the upper and bottom nozzles of the spent fuel assembly, an extractor to extract the spent fuel rods from the assembly, and a cutter to cut the extracted spent fuel rods as a final step to transfer the rod-cuts to the mechanical decladding process. 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 down ender and dismantler, these systems were analyzed and designed, also concept on the interference tools between down ender and dismantler were considered by using the solid works tool.