Incremental efficiency and the impact of 'News' on foreign exchange markets/ : by Hyung-Doh Hur

Hur, Hyung-Doh Indiana Univ. 1985 해외박사

환율은 두나라 통화의 상대가격이며 그 변동은 금융자산 가격의 변동과 유사한 방 법으로 분석되어질 수 있다. 효율적 시장 가설은 가격결정에 있어서 시장조정기능이 어떻게 작용하며 수집가능한 정보에 어떻게 반응하는 가에 그 주안점을 두고 있다. 최근에 개발된 누증적 효율성의 개념은 환율결정의 통화적 접근을 정보집단의 내용들 로서 직접 실증분석할 수가 있다. 본 논문은 5개국 주요 통화의 대미환율($/FF, $/DM. $/Lira, $/Yen 그리고 $/Pound)의 효율적 특성과 환율결정의 통화론적 접근방법의 유 동성을 1973년 1월에서1982년 6월 기간동안의 자료를 이용하여 연구 분석하고 있다. 특히, 본 연구는 외환시장이 과거의 현물환율, 선물환율, 뉴스, 그리고 통화량에 영향 을 미치는 변수들과 같은 특정 정보집단들을 완전히 반영하고 있는 지에 그 초점을 맞 추고 있다. 또한 전통적인 환율변동의 임의성 검증과 선물시장의 효율성 검증을 보다 다양한 외환시장과 보다 확장된 표본기간으로 그 연구 범위를 확대시키고 있다. 특히 , 누증적 효율성 검증은 최근에 개발된 다중량 투입 전환 함수기법을 이용하여 일반통 화이론 모형으로 확장되어진다. 본 연구 결과는 두가지 주요사항을 의미하고 있다. 하 나는 환율의 변동이 효율적 자산시장의 견해와 일치하며 실질소득에 관련한 뉴스가 다 른 통화관련뉴스와 이자율뉴스보다 더 중요한 역할을 한다는 것이다. 다른 하나는 환 율결정의 통화론적 접근 방법이 유용하더라도 시장 효율성의 존재가 통화적 변수의 영 향을 초단기간으로 국한시켜 버린다는 사실이다. 이러한 증거는 외환시장의 효율성과 환율의 통화론적 결정의 동시가설을 지지해주고 있다.

A Study in the Reduction and the Recovery Process of Converter Slag and Dust

Hur, Nam-Suk Graduate School, Sunchon National University 2005 국내박사

Various kinds of by-products are generated from the steelworks. After considering the characteristics of BOF slag, the possibility of recycling BOF slag as dephosphorization or desulfurization flux of hot metal without pretreatment was investigated. From experiments using an electric resistance furnace, it has been confirmed that BOF slag can be used as flux for hot metal treatment. By the use of BOF slag mixed with sintered ore, lime and fluorspar, test flux shows its ability of controlling phosphorus content less than 50 ppm in molten iron. A mixture of BOF slag and lime also shows good possibility as desulfurization flux. Use of BOF slag can be remarkably expanded if phosphorus content in slag is reduced in an economical way. In addition to the possibility of BOF slag recycling without modification, a new reduction process has been proposed for recycling BOF slag after reducing oxides in slag in order to further increase recycling. The preliminary study was done to examine the possibility of reducing BOF slag in the induction furnace. Reduced slag showed a good possibility of desulfurization flux. The reduction experiments with BOF slag showed that approximately 50% of the phosphorus in BOF slag vaporized. The mechanism and rate of phosphorus loss by vaporization were closely studied to maximize phosphorus removal to the gas phase in order to reduce the final phosphorus content in molten metal. Laboratorial experiments have been carried out to elucidate the vaporization mechanism of phosphorus in slag and to assess reaction rate by the use of a mass spectrometry for analyzing the outlet gases and the X-ray fluoroscopy for observing the gas bubbles evolved at the reaction interface. The results indicate that the reaction rate follows first-order with respect to phosphorus content. The reaction rate was controlled by liquid phase mass transfer at the low phosphorus content(less than 1%). However, at the high phosphorus content, a chemical reaction controls the reduction rate. Iron oxide dust is another kind of major by-products from the steelmaking plant in addition to BOF slag. Its recycling at the BOF involved sulfate problem mainly from the binder used in pelletizing. The behavior of sulfate in dust pellet under the various oxygen potentials has been studied to minimize dissolving sulfate into molten metal. Sulfate in the pellets generates SO_(2)gas by the reaction with CO gas, elements in molten metal and Fe_(t)O in slag. Decomposed SO_(2)gas was evaporated when the oxygen potential was high. On the contrary, it was reduced and dissolved into molten metal which contains high carbon.

Reforming the regulatory regime for credit rating agencies in Korea : analysis and proposal based on recent U.S. experience

Hur, Jungwon ProQuest UMI Dissertation 2014 국내박사

The Piano as orchestral member : various approaches in non-concerto compositions

Hur, Eun Indiana Univ. 1994 국내석사

Rupture ductile en l'acier 30CD4

Hur, Sung Kang L'Universite de Technologie de Compiegne 1984 국내박사

Trade unions and productivity

Hur, Chan Young Univ. of Wales 1988 국내박사

Automated Deployment of IoT Services based on Semantic Model : 시맨틱 모델에 기반한 IoT 서비스의 자동 배치

Hur, Kang Ho 연세대학교 일반대학원 2016 국내석사

사물 인터넷(Internet of Things) 기술이 발전함에 따라 서로 다른 특성을 갖는 수 많은 사물이 인터넷을 통해 연결 가능하게 되었다. 하지만, 더 많은 사물들이 서로 연결되면 될수록 사물들간의 상호 운용성 문제점은 더욱 대두되고 있다. 이러한 상호 운용성 이슈들을 해결하기 위해 HTTP, JSON과 같은 웹(Web) 기술들을 적용하는 많은 연구가 진행되고 있다. 최근의 사물 웹(Web of Things) 환경에서 우리는 다양한 사물 인터넷 플랫폼을 접하고 있다. 사물 인터넷 플랫폼은 사용자들에게 웹 상에서 보다 쉽게 수많은 양의 사물과 데이터를 관리하고, 그것들을 조합하여 새로운 서비스를 만들어 내는 기능을 제공하고 있다. 특히, 서로 다른 특성을 갖고 있는 수많은 사물들이 서로 다른 플랫폼에 배치되는 실 세계 상황에서는, 다양한 사물들과 플랫폼간의 상호 운용성 문제는 반드시 해결해야 할 중요한 문제가 되고 있다. 본 논문에서는 이러한 상호 운용성 이슈를 해결하기 위해, 다양한 플랫폼에 적용될 수 있는 시맨틱 서비스 명세 온톨로지 (Semantic Service Description Ontology)를 제안한다. 해당 온톨로지는 이종의 사물들에 대한 속성과 특성들을 기술하는 것뿐만 아니라, 각각의 IoT 플랫폼이 정의하고 있는 정보들을 포괄하고 있다. 또한, 제안된 온톨로지를 기반하여 사물을 배치하기 위해 필요한 서비스 명세서(Service Description)를 자동으로 생성하는 방법과 다양한 플랫폼에 IoT 서비스를 자동배치하기 위한 방법을 제시한다. The Internet of Things (IoT) is making it possible for a large number of heterogeneous physical objects (or things) to be connected to the Internet. However, as more and more things are getting connected, interoperability issues have been raised as one of the major challenges in achieving the vision of IoT. To cope with this issue, many researches and industry communities have begun to adopt Web technologies such as HTTP, JSON, and REST. With the current trend of the Web of Things (WoT), we encounter various IoT platforms or middlewares which are able to collect, manage and mashup the huge mass of things and their data. Considering the large number of heterogeneous things deployed across different platforms, the interoperability problem between things and platforms has now come to the fore. In this thesis, we present a semantic approach to generating a service description and deploying a set of heterogeneous things to different platforms automatically. Firstly, we propose a lightweight service description ontology to cope with platform interoperability problem. The ontology describes such that the conceptualization of the property and capability of virtual entity as well as the platform specific information such as server URL, API Key. Secondly, on the basis of the proposed ontology, we suggest an efficient semantic approach to generate service description and to deploy services. Experimental results with the prototype implementation show the potential of the automated IoT service deployment based proposed semantic model. We believe that our work will be widely applied to both heterogeneous things and existing IoT platforms without big effort.

Language shift and bilingualism in the Soviet Union

Hur, Seung-Chul Brown Univ. 1988 국내박사

In search of strategic alternatives to improve economic cooperation between Korea and ASEAN

Hur, Jieun Graduate School of International Studies, Yonsei U 1997 국내석사

Essays on Financial Frictions and Macroeconomics

Hur, Sewon University of Minnesota 2012 해외박사(DDOD)

소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

This dissertation consists of three essays. The first essay analyzes the effects of the Great Recession on different generations. While older generations have suffered the largest decline in wealth due to the collapse in asset prices, younger generations have suffered the largest decline in labor income. Potentially, the young may benefit from the purchase of cheaper assets, especially if they have access to credit. To analyze the impact of these channels, I construct an overlapping generations model with borrowing constraints in which households choose a portfolio over housing as well as risk-free and risky financial assets. Shocks to labor efficiency and uncertainty regarding the return on risky assets generate a recession with a drop in asset prices and cross-sectional changes in consumption, investment, and wealth that are consistent with the recent recession. In particular, younger generations experience large declines in nondurable consumption and housing investment, a fact that is supported by the data. Overall, the young suffer the largest welfare losses, equivalent to a 5 percent reduction in lifetime consumption. In the second essay, Illenin Kondo and I study the foreign reserves accumulation of emerging economies. Emerging economies, unlike advanced economies, have accumulated large foreign reserve holdings. We argue that this policy is an optimal response to an increase in foreign debt rollover risk. In our model, reserves play a crucial role in reducing debt rollover crises ("sudden stops"), akin to the role of bank reserves in preventing bank runs. An unexpected increase in rollover risk leads to a global rise in sudden stops, prompting emerging economies to update their priors about the risk they face. We show that a global increase in the rollover risk faced by emerging economies explains the outburst of sudden stops in the late 1990s, the subsequent increase in foreign reserves holdings, and the salient resilience of these countries to sudden stops ever since. In the third essay, Jose Asturias and I examine the role of entry barriers on firm entry and exit, aggregate productivity and output. Using cross-country data, we document that gross domestic product (GDP) per capita is positively correlated with firm entry rates, and that firm entry rates are positively correlated with barriers to firm entry. We develop a model, based on Asturias, Hur, Kehoe, and Ruhl (2012) where aggregate productivity growth is driven by the endogenous entry of productive firms and the endogenous exit of unproductive firms. Differences in entry policy lead to different levels of entry and output, while all economies grow at a balanced growth path with identical growth rates. In the quantitative extension, we show that reforms to entry costs can generate transition paths that resemble that of high-growth emerging economies.