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Jaehyoung Koo,전형탁,Sangmin Jeon,Seokhoon Kim,Yangdo Kim,Youngdo Won 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.I
Al2O3 thin films were deposited by using the plasma-enhanced atomic-layer deposition (PEALD) method and then investigated as a replacement for SiO2 gate dielectric films. Two different precursors, dimethylaluminum isopropoxide [DMAI, (CH3)2AlOCH(CH3)2] and trimethylaluminum [TMA, Al(CH3)3], were used to deposit the Al2O3. An oxygen plasma was used as the reactant gas. The process window of the Al2O3 films deposited using the DMAI precursor was wider than that of the Al2O3 films deposited using the TMA precursor. A linear relationship between film thickness and the number of process cycles was observed after the initial 50 cycles of Al2O3 deposition. The linear film growth rates were 0.14 nm/cycle and 0.12 nm/cycle using TMA and DMAI, respectively. Both Al2O3 films showed an amorphous structure with an Al silicate phase. The leakage currents of as-deposited Al2O3 with TMA and DMAI were approximately 7.9 × 10.9 and 3.3 × 10.9 A/cm2 with calculated EOT values of approximately 3.2 and 3.3 nm, respectively. In particular, the Al2O3 films deposited using the newly synthesized DMAI precursor, which is non-pyrophoric and safe, had comparable electrical properties to those of the Al2O3 films deposited using the TMA precursor.e
A Critical Analysis of Intentional Fouling in Sports
( Jaehyoung Kim ) 한국체육학회 2016 국제스포츠과학 학술대회 Vol.2016 No.1
Purpose: This study aims to analyze ethical problems raised by intentional fouling in sports in order to suggest solutions to the issues. These ethical problems are examined in detail enabling us to provide a robust analysis for the suggested solution. Method: Various cases of intentional fouling were examined in order to understand how ethical problems are contingent on various conditions found in relation to the ethical fair play of sport. Second, I review literature in the fields of sport ethics and philosophy in order to analyze these widely accepted problems through a critical lens. Thirdly, I have presented the arguments in favor for intentional fouling which lead to the current circumstances in which intentional fouling has gained wide acceptance. I have specifically focused on basketball and the analysis of philosophic discourse related to intentional fouling and strategic fouling. I scrutinize ethical consideration of intentional fouling and whether the fouling is morally valid or not. Finally this study will recommend compromises based on the current relationship of intentional fouling and sport as a means to help rectify current issues. Result: This study analyzes a series of studies in relation to intentional fouling and strategic fouling through a theoretical and ethical lens. This study introduces why intentional fouling is ethically wrong and how it incites ethical problems such as player injuries, non-sportsmanship behaviors and match fixing. If intentional fouling is unrestricted for strategic gain, negative consequences will continue to be a part of sport. Thus, this study emphasizes the seriousness of its problems and helps resolve these issues. Conclusion: In closing this study contemplates ethical problems of intentional fouling and sheds light on strategic play. This study does not take lightly the deeds that tend to harm the originality of sports, injure players and manipulate the outcomes of games. As a result this study stipulates that sports should remain within the boundaries of our general moral judgment and choices. Violating such ethical judgments regardless of commonality and acceptability are not exempt from the implementation of general standards of ethics.
Habitat Fragmentation by a Levee and Its Impact on Frog Population in the Civilian Control Zone
Jaehyoung Ju,Jae Hyun Kim,Kim・Seung Ho Kim 한국습지학회 2016 한국습지학회지 Vol.18 No.2
본 연구는 민간인통제구역에 건설된 제방으로 인한 생태계 분절이 양서류 서식지에 미치는 영향을 알아보기 위해 수행되었다. 이를 위해 제방 한편에 두 논(사이트 1, 2)과 제방 옆을 지나는 수내천(사이트 3), 그리고 제방 다른 편의 관개수로가 위치한 논(사이트 4)에 대해 7개월간에 걸쳐 조사를 실시하였다. 조사 결과, 주로 논과 수변지역에 많이 서식하는참개구리(295개체), 청구개리(n=220개체), 옴개구리(124개체)가 주로 발견되었고 한국산 개구리(8개체)와 두꺼비(3개체)도 일부 확인되었다. 이 양서류들은 계절에 따른 물 공급 상황의 변화에 따라 논과 하천 지역에서 양적 변화를 보여사이트 1,2,3에서 두드러지게 나타났으나 제방 반대편의 사이트 4에서는 풍부한 수자원에도 불구하고 양적 변화가 적은것으로 나타났다. 가뭄철 수내천에 물이 말라 이 지역 개구리들이 현저히 감소했을 때에도 물이 풍부하고 거리가 비슷한제방 건너편의 사이트 4보다는 제방 같은 편의 사이트 1, 2 지역에서 다수의 개구리들의 존재가 확인되었다. We examined whether an artificial levee constructed on prime amphibian habitat influences fragmentation. Four different sites on both sides of a levee in the Civilian Control Zone(CCZ) were probed. Sites 1 and 2 are rice paddies on one side of the levee, and Site 3 is the stream that locates in the same side. All the three sites have water conditions of seasonal variance. On the other side, Site 4 consists of rice paddies with a stable condition of water supply, irrigated through a canal. The research sites were frequented and the frog populations were closely monitored. The investigation identified five species. Pelophylax nigromaculatus was the most frequent (n=295), followed by Hyla japonica (n=220) and Glandirana rugosa (n=124). Three Bufo gargarizans and eight Rana coreana were also found. The amphibians, however, were found to relocate themselves according to water condition to rice paddies or stream only within one side of the levee. Despite having ample sources of water and foods, Site 4 lacked large populations of frogs, even when droughts came. Both the species dominance index and the richness index indicated a more favorable living condition of the one side of the levee (Sites 1 and 2) over the other.
Jaehyoung Koo,전형탁 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.4
Thin films of Al2O3, HfO2, and an l2O3/HfO2 bilayer were investigated as potential replacements for the SiO2 gate dielectric. The Al2O3 film showed an amorphous structure without an interfacial layer while the HfO2 film showed a randomly oriented polycrystalline structure with a Hf-silicate interlayer. We noted that the two gate dielectrics Al2O3 and HfO2 had characteristics complementary to each other and that it was possible to achieve a high-k gate oxide with a low leakage current and a large band gap by using an Al2O3/HfO2 bilayer. The leakage currents of the Al2O3, HfO2, and Al2O3/HfO2 films were about 4.2 × 10−8, 8.2 × 10−4, and 2.4 × 10−6 A/cm2 at a gate bias voltage of |VG – VFB| = 2 V. The corresponding calculated equivalent oxide thicknesses (EOT) were about 2.3, 1.8, and 1.3 nm, respectively. The Al2O3/HfO2 bilayer showed generally improved gate oxide characteristics compared to those of the individual Al2O3 and HfO2 films.
Toroidal-Shaped Coils for a Wireless Power Transfer System for an Unmanned Aerial Vehicle
Jaehyoung Park,Jonghoon Kim,Yujun Shin,Bumjin Park,Won-Seok Kim,Seok-Jong Cheong,Seungyoung Ahn 한국전자파학회JEES 2019 Journal of Electromagnetic Engineering and Science Vol.19 No.1
Unmanned aerial vehicles (UAVs) using communications, sensors, and navigation equipment will play a key role in future warfare. Currently, UAVs are monitored to prevent misfire and accidents, and the conventional method adopted uses wires for data transmission and power supply. The repeated connection and disconnection of cables increases maintenance time and harms the connector. For convenience and stability, a wireless power transfer system to power UAVs is needed. Unlike other wireless power transfer (WPT) applications, the size of the receiving coils must be small, so that the WPT systems can be embedded inside space-limited UAVs. The small size reduces the coupling coefficient and transfer efficiency between the transmitting and the receiving coils. In this study, we propose a toroidal-shaped coil for a WPT system for UAVs with high coupling coefficient with minimum space requirements. For validation, conventional coils and the proposed toroidal-shaped coil were used and their coupling coefficient and power transfer efficiency were compared using simulated and measured results. The simulated and measured results were strongly correlated, confirming that the proposed WPT system significantly improved efficiency with negligible change in the space requirement.