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Shin
No full textThe intention of this paper is to respond to the increase in electric power demand and global environmental issues in iron and steel plants. In particular, the authors studied the characteristics of the power flow from a distributed generation (DG) system connected to the electrical power system of a steel plant. In addition, the authors carried out an economic analysis of the DG system by calculating the capital investment cost that could convert the profit of the DG into a certain profit. The research was conducted based on the power system configuration and basic data of a steel plant in operation in Korea. To analyze the unconnected DG of the power system, a transmission voltage target was set, and the voltage characteristics of 22.9 and 6.6 kV systems were analyzed. The authors analyzed the connected DG system in terms of the effect of link location, power factor, and output power by case. The authors also studied the power loss variation in the output power of a DG system. Various simulations with MATLAB software and NPV (Net Present Value) and IRR (Internal Rate of Return) methods were run in an economic analysis to compare the case of not introducing an energy storage system (ESS), and the case of introducing an ESS in terms of comprehensive energy utilization. The results of the economic analysis indicated that the scenario with ESS is more economically advantageous, resulting from the peak power reduction effect and the evasion cost due to the elimination of the power generation operation of the peak load. Developed countries have established best available technology (BAT) standards and developed related practices to apply them to industrial plants, actively preparing for environmental issues in the future. In Korea and in some other countries, the application of distributed generation in conjunction with the steel plant sector will be effective for improving energy efficiency and responding to environmental issues.11Ysciessciscopu
Jae shin Lee
No full text학위논문(석사)--아주대학교 일반대학원 :경영학과,2009. 2Bharath와 Shumway는 “Forecasting Default with the Merton Distance to Default Model", RFS,2008에서 미국 기업 데이터를 바탕으로 Merton모형의 유의성을 테스트 하였다. 본 논문은 Merton의 채권 가격 결정 모델 (1974)에 근거하여 부도 확률을 추정하는 Merton distance to default (DD) 모형의 유의성을 Bharath와 Shumway가 이용한 방법론을 적용하여 KOSPI 상장 기업들을 대상으로 테스트 해 보고, 그들의 주장이 미국과 다소 시장 여건이 다른 국내 시장에서도 성립하는 지 여부를 검토하였다. 본 논문에서는 이러한 Merton 모형을 이용하여 부도 확률을 계산한 결과와, 이를 대체하기 위해 Bharath와 Shumway가 제안한“naive"한 모델을 통해 계산된 부도 확률을 비교해 보았다.
“naive”한 모델은 Merton 모형에서 쓰이는 부도거리(distance to default)의 구조적인 형태를 동일하게 사용하지만, 실질적으로 iterative한 방법을 통해 내재부도확률(implied probability of default)을 계산해 낼 필요가 없는 단순성을 지닌다. 본 연구에서는 국내 시장에 있어서도 이러한 “naive"한 예측치가 Merton DD 모형 의 예측치 보다 hazard models내의 유의성과 out-of-sample 테스트의 예측력에 있어 좀 더 우월하다는 결론을 도출하였다.
결론적으로, Merton DD 모형은 부도에 대한 충분한 확률 예측치를 도출한다고 볼 수는 없으나, Merton DD 모형의 함수적 형태 는 부도 위험을 예측하는데 유용하다는 Bharath와 Shumway의 주장은 KOSPI 기업을 대상으로 검증하였을 때에도 설득력을 갖는다.제1장 서 론 5
제1절 연구의 목적 5
제2절 논문의 구성 7
제2장 부도 예측 모델들 8
제1절 The Merton Distance to Default (DD) 모형 8
제2절 Moody's KMV 모형 10
제3절 A naive alternative 11
제4절 Hazard models 13
제3장 데이터 17
제4장 결 과 21
제1절 Hazard model의 결과 21
제2절 Out-of-sample Test결과 24
제3절 Mu에 따른 비교 분석 29
제5장 결 론 33Maste
Shin Jae-yong
No full text학위논문(석사)--아주대학교 산업대학원 :기계공학과,2014. 8원전은 수많은 계통 및 기기들이 사용되며 이 기기들을 구동 또는 제어하기 위한 수많은 전기 및 계측 기기들이 사용된다.
이 중 전기 및 계측기기는 원전 운영기간인 40년 동안 수없이 많은 부품의 교체가 수반된다. 부품 중에는 40년 동안 계속 생산되는 부품보다는 단종 되거나 새로운 부품으로 교체되는 사례가 빈번하다.
이러한 부품들이 원전에 사용되기 위해서는 내진검증이 수행되어야 한다.
전기 및 계측 기기는 주로 캐비넷 형태로 제작되며, 처음 내진검증 시에는 부품을 포함한 캐비넷 전체를 내진시험하기 때문에 원활한 검증을 할 수 있지만 원전 운영 중에는 캐비넷을 시험할 수가 없으므로 부품만 별도로 시험할 수 밖에 없다.
캐비넷의 내진특성은 기기의 설치 위치별로 증폭되거나 감쇠하는 특성 때문에 교체부품의 내진검증에 요구되는 내진특성을 해석으로서 찾아내어 검증에 사용해왔다.
그러나, 수많은 기기의 교체시마다 해석적인 방법을 사용하는 것은 시간적 및 경제적으로 효율적이지 않으므로 캐비넷 종류별로 지진 증폭계수의 패턴을 분석하여 교체 기기의 내진검증에 적용하고자 한다.Ⅰ. 서 론 1
1. 연구의 필요성 및 연구 방향 1
2. 관련연구 사례분석 2
Ⅱ. 본론 3
1. 캐비넷 증폭계수 분석에 관한 이론적 배경 3
2. 해석에 사용된 기본 정보 7
3. 음향감시 캐비넷 분석 11
4. 신호처리 캐비넷 분석 28
5. PPS 캐비넷 분석 39
6. ESFAS 캐비넷 분석 46
III. 결론 58
1. 캐비넷별 및 구역별 증폭계수 분석결과 58
2. 캐비넷의 지진증폭 공통패턴 59
3. 기대효과 59
참고 문헌 60Maste
Ampithoe changbaensis Shin and Coleman 2021
No full text4. Ampithoe changbaensis Shin and Coleman, 2021 (Fig. 6D) Material examined. 25 inds., Yecho-ri Port, 28 August 2021. Distribution. Korea (Jejudo Island, south and east coasts).Published as part of Kim, Kyung-Won, Zhang, Xin, Choi, Jae-Hong, Kim, Jun & Kim, So-Yeon Shin and Young-Hyo, 2023, Amphipods (Crustacea: Malacostraca) fauna from Chujado Island in Korea, pp. 1-26 in Journal of Species Research 12 (1) on page 2, DOI: 10.12651/JSR.2023.12.1.001, http://zenodo.org/record/812010
Executive bonus target ratcheting: Evidence from the new executive compensation disclosure rules
No full textThis study investigates whether firms revise executive bonus compensation targets based on past performance. Studies in this area suffer from a lack of detailed information related to executive performance targets. Using mandatory disclosures of executive compensation information under the U.S. Securities and Exchange Commission's new disclosure rules, this study provides the first large-sample evidence of bonus target ratcheting. There are three major findings: (i) executive bonus targets ratchet and they ratchet asymmetrically; (ii) the degree of target ratcheting and ratcheting asymmetry vary with executive equity incentives and investment opportunities; and (iii) performance relative to bonus target is serially correlated.OAIID:RECH_ACHV_DSTSH_NO:T201722538RECH_ACHV_FG:RR00200001ADJUST_YN:EMP_ID:A079223CITE_RATE:2.065FILENAME:Kim and Shin 2017-Contemporary_Accounting_Research.pdfDEPT_NM:경영학과EMAIL:[email protected]_YN:YFILEURL:https://srnd.snu.ac.kr/eXrepEIR/fws/file/ecfee59a-34ec-4bff-b177-591a43e87794/linkN
How Space is Told: Linking Trajectory, Narrative, and Intent in Augmented Reality Storytelling for Cultural Heritage Sites
No full textWe report on a qualitative study in which 22 participants created Augmented Reality (AR) stories for outdoor cultural heritage sites. As storytelling is a crucial strategy for AR content aimed at providing meaningful experiences, the emphasis has been on what storytelling does, rather than how it is done, the end user's needs prioritized over the author's. To address this imbalance, we identify how recurring patterns in the spatial trajectories and narrative compositions of AR stories for cultural heritage sites are linked to the author's intent and creative process: While authors tend to bind story arcs tightly to confined trajectories for narrative delivery, the need for spatial exploration results in thematic content mapped loosely onto encompassing trajectories. Based on our analysis, we present design recommendations for site-specific AR storytelling tools that can support authors in delivering their intent while leveraging the placeness of cultural heritage sites as a creative resource
Assessment of reliability in orthodontic literature: A meta-epidemiological study
No full textObjectives: To map the statistical methods applied to assess reliability in orthodontic publications and to identify possible trends over time.
Materials and Methods: Original research articles published in 2009 and 2019 in a subset of orthodontic journals were downloaded. Publication characteristics, including publication year, number of authors, single vs multicenter study, geographic origin of the study, statistician involvement, study category, subject category, types of reliability assessment, and statistical methods applied to assess reliability, were recorded. Descriptive statistics, Chi-square tests, and logistic regression analyses were performed to investigate associations between reliability analysis and study characteristics.
Results: A total of 768 original research articles were analyzed. The most prevalent study category was observational (69%) with a statistician involved in 16% of studies. Overall, reliability was assessed in 47% of studies, and the most frequent methods applied to assess reliability were intraclass correlation coefficients or kappa statistics (60.4%). The odds of applying appropriate methods were greater in 2019 than in 2009 (odds ratio [OR]: 2.43; 95% confidence interval [CI]: 1.75, 3.37; P , .001). Involvement of a statistician resulted in greater odds of applying appropriate methods compared to no statistician involvement (OR: 1.88; 95% CI: 1.23, 2.87; P , .01).
Conclusions: Over the past decade (2009 vs 2019), reliability assessment became more common in the orthodontic literature, and studies applying correct statistical methods to assess reliability significantly increased. This trend was more apparent in studies that involved a statistician, which may highlight the role of the statistician
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