Necessity of Reorganization of Mental Health Welfare Act to Decrease in Social Anxiety Related to Patients with Schizophrenia and to Ensure Proper Human Rights for Mentally Ill Persons

Hoseon Lee,Joonho Choi,Myung Soo Lee,Jong-Woo Paik,Jun Soo Kwon 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.8

Multilevel Analysis of Primary and Secondary Metabolites from Nitrogen, Phosphorus or Potassium-Deficient Tomato (Solanum lycopersicum L.)

Hoseon Song,Yejin Lee,Sangkeun Ha,Jwakyung Sung 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.10

European Fiscal Crisis and Growth of the World Economy

Hoseon Hwang 한국유럽학회 2013 유럽연구 Vol.31 No.1

2008-2009년 세계금융위기 이후, 많은 국가들이 가능한 모든 정책수단을 동원하여 경기를 부양하여왔다. 유럽의 PIIGS국가들은 이러한 정책들로 인하여 가장 심각한 여파를 안게 되었다. 재정적자의 누적과 급증하는 국가부채는 그 국가들을 격심한 재정위기로 몰아 넣었다. 이러한 재정위기로 인하여 그 국가들은 국가부도를 피하기 위하여 혹독한 긴축재정을 실시하였으며 격심한 불황에 빠지게 되었다. 국가간 상호의존이 점증하는 세계화 시대에, 긴축정책의 경제적 효과는 여타 국가들에게 엄청난 영향을 주게 된다. 멕콤비-썰월 연계성장모형에 의하면, PIIGS국가들의 긴축정책은, 연계승수효과와 아울러 국제경제 에서 국제수지불균형의 조정메커니즘의 비대칭성 때문에, 그들 국가뿐만 아니라 여타국가들의 경제를 불황의 늪으로 몰아 넣게 된다. 더욱이 장기적으로 볼 때, 세계경제의 저성장상태는, PIIGS국가들의 재정위기가 해소될 때까지 지속될 것으로 전망된다. 세계경제의 이러한 암울한 전망에서 벗어나는 유일한 출구는 관련된 모든 국가들이 PIIGS국가들의 재정위기를 해소하기 위한 어떤 형태의 합의된 해결책을 도출하는 것으로 보인다. 국제적으로 합의된 해결책에는 PIIGS국가들에 대한 금융지원과 더불어 국제수지조정 메커니즘의 전환, 즉 긴축적 조정에서 확장적 조정으로의 전환이 필요하다. Since the worldwide financial crisis of 2008-2009, many countries have tried various methods to boost their economies using all the possible policy instruments at their disposal. Some of those policies left serious aftermath behind. Several European countries, known as the PIIGS, are those which have been most seriously hit by the aftermath. Accumulation of budget deficit and the consequent snowballing of national debt have put them under a severe fiscal crisis. This crisis has driven those countries to adopt massive deflationary policies in order to survive imminent national default, dragging their economies into a grim depression. With increasing interdependence among individual national economies at the time of globalization, the adverse effect of those deflationary policies spread to the other economies with a significant impact. According to McCombie-Thirlwall growth model of linkage effect, the deflationary policies of the PIIGS countries should drag not only those countries but also the rest of the world into a trap of economic depression, because of both linked multiplier effect and an inherent asymmetry in the adjustment mechanism for balance-of-payments disequilibrium in the international economy. Moreover, in long-term perspective, this status of low stagnant growth should persist for quite a while in the international economy, until the fiscal crisis of the PIIGS countries is resolved. With this dismal prospect for the world economy, the only way out of the trap of stagnant economic growth is that the countries involved figure out some kind of coordinated solution to pull the PIIGS countries out of their fiscal crises. The coordinated solution should contain not only financial aid to the PIIGS countries but also a conversion of balance-of-payments adjustment mechanism from deflationary adjustment to reflationary one.

Transient Response of a Stratified Thermal Storage Tank to the Variation of Inlet Temperature

Hoseon Yoo 대한설비공학회 1998 International Journal Of Air-Conditioning and Refr Vol.6 No.-

This paper deals with approximate analytical solutions for the two-region one-dimensional model describing the charging process of stratified thermal storage tanks at variable inlet temperature with momentum-induced mixing. An arbitrarily increasing inlet temperature is decomposed into inherent step changes and intervals of continuous change. Each continuous interval is approximated as a finite number of piecewise linear functions, which admits an analytical solution for perfectly mixed region. Using the Laplace transform, the temperature profiles in plug flow region with both the semi-infinite and adiabatic ends are successfully derived in terms of well-defined functions. The effect of end condition on the solution proves to be negligible under the practical operating conditions. For a quadratic variation of inlet temperature, the approximate solution employing a moderate number of pieces agrees excellently with the exact solution.

Estimation of Strong Ground Motion by the Causative Fault of the Gyeongju Earthquake in 2016

( Hoseon Choi ),( Junmo Yang ),( Myunghyun Noh ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

At 19:44 on September 12, 2016, an earthquake with ML 5.1 occurred in the Gyeongju area, South Korea. In about 50 minutes, the mainshock with ML 5.8 occurred. The Gyeongju earthquake is the largest instrumental one since the Korea Meteorological Administration started its formal earthquake reporting around the Korean Peninsula in 1978. The geological survey near the epicenter showed no evidence of surface faulting. The geometry of the causative fault of the Gyeongju earthquake could be inferred in detail from the distribution of aftershocks. So the fault can be regarded as a seismogenic source. We modeled the causative fault of the Gyeongju earthquake using the data available to date, and simulated strong ground motions based on the stochastic and empirical Green’s function techniques. The hypothetical seismic wave transmission information beneath the site of interest was assumed. We assumed MW 6.5 to be the maximum earthquake potential of the causative fault based on historical earthquakes around Gyeongju area. According to the assumed magnitude, the size of the causative fault could be varied. The sensitivity analysis of parameters such as the ratio of fault length to width, stress drop, and so on was performed.

주파수 영역 기반 BPM-UWB 시스템에서의 채널 추정 및 보상

최호선(Hoseon Choi),장동헌(Dongheon Jang),안동헌(Donghun An),양훈기(Hoongee Yang),양성현(Seonghyeon Yang) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.9A

본 논문은 ADC(analog-to-digital converter)의 속도에 의한 시간 영역에서 채널 추정 한계를 극복하기 위해서 트레이닝(training) 신호의 주파수 성분을 이용해서 다중경로 채널을 추정하고 이를 이용해서 채널 왜곡을 보상하는 BPM(biphase modulation)-UWB 수신기를 제안한다. 여러 개의 펄스로 구성된 펄스열의 주기적인 특성을 이용해서 효과적으로 채널 추정이 가능함을 수학적으로 보인다. 또한 추정된 채널 주파수 응답 정보를 이용해서 시스템 성능을 최적화 시킬 수 있는 디지털 수신부 구조를 제시하며 BER성능을 유도한다. 시뮬레이션을 통해 제시된 방법이 다중경로 채널을 보상함으로써 수신기의 BER성능이 획기적으로 개선됨을 보인다. To overcome the limit of the time-domain based channel estimation caused by the ADC speed, this paper present a new BPM-UWB receiver where the channel estimations and the compensations are digitally performed in the frequency domain. We theoretically show that the channel estimation can be accomplished by exploiting the periodicity of a training sequence consisting of finite number of pulses. We also present the digital receiver structure to implement the proposed system and derive its BER performances. Through computer simulations, we show the proposed receiver can dramatically improve the BER performances due to the incorporation of the estimated channel frequency response.

지역냉방용 직접순환식 아이스슬러리 시스템의 현장적용 사례

유호선(Hoseon Yoo),이상훈(Sang Hoon Lee),이윤표(Yoon Pyo Lee) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.9

In order to investigate the feasibility of a direct ice slurry transporting system for the purpose of district cooling, a case study of field application is performed. The research aims include the field measurement of ice packing factor, the performance of coldness delivery, and the branching characteristics of ice slurry. Two representative types of pipe branch are dealt with in this work. For the slurry flow with ice volume fraction of 0.16 or less, the pipe blocking due to aggregation is not observed. Based on the time-wise variation of temperature in the storage tank, a calculating method of ice packing factor is newly developed, which seems to be useful when the brine concentration is unknown. It is confirmed that the mass flow rate of ice slurry per unit cooling load is markedly reduced with increasing the ice content. The pumping power also decreases, but remains unchanged for high ice fractions. The distribution of ice particle before and after branching shows a good uniformity within the range of 5% difference, but yields a unique trend depending on the flow rate.

브러시레스 디젤발전기 여자기 회전형 다이오드 고장감시 방법

류호선(Hoseon Ryu),이의택(Uitaek Lee),박만기(Manki Park),이주현(Joohyun Lee),유준수(Joonsoo Lyu) 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.7

입구온도가 변화하는 성층축열조의 충전과정 해석

유호선(Hoseon Yoo) 한국태양에너지학회 1995 한국태양에너지학회 논문집 Vol.15 No.2

유입관성에 의한 유체혼합뿐 아니라 입구온도의 변화까지 고려된 성층축열조의 충전과정 모델에 대하여 해석적 근사해를 제시하였다. 해석모델은 깊이가 일정한 완전혼합 및 압출유동영역으로 구성되며, 입구온도의 변화는 중첩의 원리에 근거하여 계단함수로 근사화하였다. 완전혼합영역의 과도온도를 구한 후 함수형태에 따라 구분하고, 각각을 경계조건으로 하는 압출유동영역에 대한 최종해이다. 근사해의 타당성 및 결과의 유용성은 입구온도가 선형적으로 증가하는 경우에 대한 엄밀해와의 비교를 통하여 검증하였다. 계산수의 증가에 따라 근사해는 엄밀해로 급속히 접근하며, 유한한 수의 계단에 의한 근사해도 광범위한 혼합깊이에 대하여 엄밀해와 잘 일치한다. 또한, 혼합깊이가 클수록 소수의 계단에 의한 근사해로도 의미있는 예측결과를 얻을 수 있었다. This paper presents an approximate analytical solution to one-dimensional model of the charging process for stratified thermal storage tanks, in which variation of the inlet temperature as well as the momemtum-induced mixing is taken into accout. The mixing is incorporated into the model as a constant-depth perfectly mixed layer above the plug flow region. Based on the superposition principle, the variable inlet temperature is approximated by a number of step functions. Temperature distributions for the thermocline corresponding to three types of interfacial condition are successfully derived in terms of well-defined functions, so that a linear combination of them constitutes the final solution. Validity and utility of this work is examined through the comparison of the approximate solution with an exact solution available for the case of linearly increasing inlet temperature. With increasing the number of steps, the present solution asymptotically approaches to the exact one. Even with a limited number of steps, the present results favorably agree with those by the exact solution for a wide range of the mixing depth. Also, it is revealed that fewer steps are needed for meaningful predictions as the mixing depth becomes larger.

2MW M/G 시스템을 이용한 가스터빈 10MW 정지형 기동장치 성능시험

류호선(Hoseon Ryu),이경규(Kyungkyu Lee),문주영(Jooyoung Moon),이주현(Joohyun Lee) 대한전기학회 2020 전기학회논문지 P Vol.69 No.1

The purpose of the static starting equipment(SSE) is to accelerate a synchronous machine up to a speed at which it can begin to run on its own. Because of its compressor, gas turbine must be run up to about 20∼30% of its rated speed before it is capable itself of producing enough power to continue accelerating the set. Recent korea researchers have developed the 10MW startup equipment based on the accumulated high power conversion technology. The 10MW startup equipment, which is scheduled to be applied to the B power plant, is equipped with the latest sensorless speed control technology. It was tested for checking performance before applying to the site. In this paper, the contents of the performance test were described. The performance test for 10MW startup equipment was carried out in two stages. The first stage of the test was performed without being linked with synchronous machine. The purpose of the test was to verify the developed hardware, basic control loop etc. In case of power conversion, the current control function was tested by shorting the converter. The two-stage test was carried out on a simulated environment using 2MW M/G system test facility. Basically, the test is for all function check of starting equipment. By estimated position and speed, It accelerated rotor until rated speed. Various performance evaluation results came out from the last tests before the field application. The performance of each control mode was satisfactory and the applied technology is expected to be well used for starting equipment.