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Gihoon Cha,Hye Jin Lee,최진섭 한국물리학회 2013 Current Applied Physics Vol.13 No.8
Binder-free thickness-controllable Li4Ti5O12 for application in lithium ion batteries was fabricated by the reaction of Li2CO3 and anodic nanotubular TiO2 at 800 ℃. As the concentration of Li2CO3 increased, the thickness of Li4Ti5O12 film increased, leading to increase in discharge capacity. The Li4Ti5O12 film prepared at the optimized concentration of Li2CO3 of 3.8 x 10-6 mol displayed the maximum capacity of 104 mA h cm-2 at the first cycle, which corresponds to 103 mA h g-1. We found that excess Li2CO3 led to creation of LiTiO2 phases in the Li4Ti5O12 film, which reduced the discharge capacity. For comparison, a Li4Ti5O12 film was prepared by the reaction of Li2CO3 on a non-anodized Ti foil. In this case, discharge capacity was dramatically reduced due to the formation of Li2TiO3 phases in Li4Ti5O12, which was confirmed by TEM and XRD analysis.
Identifying the Impact of Immigration on Local Firm Entry and Exit
Gihoon Hong(홍지훈),Aaron Medlin 한국경제통상학회 2017 경제연구 Vol.35 No.1
본 논문은 지역 내 기업들이 이민자 수의 증가에 대하여 자본 투자의 확대를 통해 반응하는 과정을 분석한다. 2002년부터 2011년 사이의 미국 지역 조사 (America Community Surveys) 자료를 사용하여 실증 분석한 결과 이민자 수의 증가는 지역 내 기업의 신규진입과는 양의 상관관계를, 퇴출과는 음의 상관관계를 갖는 것으로 나타났다. 무엇보다 고학력 이민자 수의 증가는 기업의 지역 내 자본 시설 확충에 보다 큰 증가를 가져오는 것으로 나타났는데이는 이민이 지역 경제에 미치는 영향을 분석함에 있어 이주노동자의 기술 수준의 이질성을 고려하는 것이 중요함을 암시한다. This paper investigates how local firms respond to immigration through capital investment in establishments. Using data from the American Community Surveys from 2002 to 2011, we find that immigration is positively associated with establishment entry level and negatively associated with exits. In particular, high-skill immigration is found to have a greater positive impact on establishment entries, which indicates the importance of considering skill heterogeneity in studying the effects of immigration.
Gihoon Jung,Jin Kyu Kim,Sun Jun Kim,Hyun Ho Kim 대한신생아학회 2023 Neonatal medicine Vol.30 No.3
ABO and Rh incompatibility are the leading causes of hemolytic disease of the fetus and newborn (HFDN). Due to the high antigenicity of the D antigen, hemolysis and symptoms progress rapidly. However, minor blood group incompatibility manifests varying clinical symptoms, from asymptomatic cases to neonatal jaundice and fetal hydrops. This study presents a case of HFDN in which anti-C and anti-e antibodies were identified and treated with intensive phototherapy. A full-term infant weighing 3,100 g at birth, with no complications during delivery, presented with jaundice and was admitted for intensive phototherapy. Antibody testing detected anti-C and anti-e antibodies in the neonate and the mother. The patient responded well to phototherapy, and intravenous immunoglobulin was administered. The total bilirubin levels decreased, and the infant was discharged after 5 days. At the age of 12 months, the infant exhibited normal neurodevelopment. In conclusion, neonates with HFDN, due to rare minor blood incompatibility, specifically anti-C and anti-e antibodies, can mitigate hyperbilirubinemia using phototherapy. Future research should also consider the severity of the minor blood group incompatibility.
Generating Music Using a Picture and a Transform System
GiHoon Go,TaeHoon Song,SoonMook Jung,HyunUk Jeong,MyungJin Kim,MinKyung Kim,HyungMin Kim,MiYoung Kang,KeyHo Kwon,JaeWook Jeon 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper introduces a method to generate music using a picture. We outline the transform system we created to do so. We analyze pictures as visual information, and music as acoustical information. We find they have features, such as continuity, in common. We create a transform system based these common features and output the music using MIDI (Musical Instrument Digital Interface). We consider the fundamental features of music when we create the transform system. A stream of music is repetitive, has contrast, and variation. However, in general, pictures lack these features. We generate music by combining rhythm and modulated rhythm. This paper shows how to create the transform system, the process of generating music using a picture, and the algorithms involved. By showing the output’ high degree of freedom, we prove that this system can help the composer compose. The composer can quote some rhythm or melody of generated music, or can obtain inspiration to compose when listening to the outputs.
Gains from Trade Liberalization between Heterogeneous Countries: Implications for Korea-Japan FTA
Gihoon Hong,Soo Hyun Oh 대외경제정책연구원(KIEP) 2013 Working Papers Vol.2013 No.1
We study the welfare implications of a bilateral free trade agreement. The model is based on the recent trade literature that considers search and matching frictions in the labor market. We extend the model by incorporating country-level heterogeneity in terms of production technology, population, and productivity endowment. Model simulation results show a simultaneous tariff cut between symmetric countries to reduce unemployment rates and increase prices in the product market due to higher long run demand, while nevertheless benefiting the economy owing to a more rapid rise in consumer income. In the case of asymmetric countries, we find that larger gains from greater openness to trade accrue to a country with (relatively) more elastic supply occasioned by capital-intensive production technology that accommodates more flexible adjustments to output in response to increased demand. We calibrate the model to Korean and Japanese data in order to assess the expected outcome of the potential trade liberalization between those countries. With a scenario of symmetric level of trade liberalization (in terms of trade cost reduction), when we assume the same population size in a counterfactual way, we find Japan to receive greater benefits from the opening because its relatively more capital intensive production allow for quicker output adjustment upon trade liberalization. When we presume, however, that Japan’s population is 2.5 times that of Korea, the results show Korea to enjoy a slightly more surplus due to the market size effect.
청년층의 비정규직 취업결정요인 : 도구변수를 활용한 네트워크 효과 분석
홍지훈 ( Gihoon Hong ),박근환 ( Geunhwan Park ) 한국경제통상학회(구 한국경상학회,한국국민경제학회) 2018 경제연구 Vol.36 No.3
본 연구는 국내 청년 구직자의 취업 과정에서 노동시장 네트워크가 미치는 영향을 규명하고자 한다. 이를 위해 청년패널조사를 바탕으로 2008년부터 2016년 사이에 취업에 성공한 청년 근로자를 대상으로 실증분석을 시행하였다. 네트워크 참여 결정에 따른 내생성을 통제하기 위하여 현 직장소재지와 출신고교소재지의 일치 여부를 도구변수로 사용하여 분석한 결과, 최초 취업 당시 네트워크형 입직경로를 사용할 경우 정규직보다는 비정규직으로 채용될 확률이 약 12%p 높아지는 것으로 나타났다. 이러한 결과는 네트워크 참여자의 규모가 증가함에 따라 발생할 수 있는 혼잡효과에 따른 것으로 볼 수 있으며 이는 국내 노동시장에서 장기간 지속되어 온 청년 실업의 증가 속에서 구인율과 실업률의 비율로 측정되는 노동시장 긴장도가 상당히 느슨해 진 상태임을 의미한다는 점에서 정책적 시사점을 제시하고 있다. This paper examines the effect of networks as a determinant of temporary employment status in the labor market. We use Korean data from Youth Panel 2007 in order to focus on the network effects on young workers who are newly employed between 2008 and 2016. After addressing the endogeneity issue associated with the decision to participate in networks through the instrumental variables method, we find that the use of social networks in the job search process decreases (increases) the probability of obtaining regular (temporary) employment by 12% points. The adverse effect of networks on the labor market outcomes could be a result of congestion effect that may arise as the size of network gets larger. The result offers some useful policy implications as it suggests the labor market tightness as defined by the ratio of vacancy creation and unemployment rates is quite loose for young workers in Korea, possibly due to the prolonged youth unemployment in the nation.