불균일 열량 조건에서의 진동형 히트파이프 열전달 특성

조원희(Wonhee Cho),장동수(Dong Soo Jang),임준엽(Junyub Lim),송경수(Kyeongsoo Song),김용찬(Yongchan Kim) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.11

효율적인 ID 기반의 Threshold 대리 서명

조원희(Wonhee Cho),박근수(Kunsoo Park) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2

ID기반의 암호 시스템은 사용자의 ID를 공개키처럼 활용하는 시스템[1]이다. ID 기반 threshold 대리 서명(IDTPS)은 이러한 환경에서 사용 가능한 threshold 대리 서명 기법이며, Xu 등[2]에 의해 SOK-IBS[3]를 기반으로 처음 만들어졌다. 본 논문에서는 Cha-Cheon[4]의 서명 기법을 기반으로 하는 효율적인 ID 기반의 threshold 대리 서명을 제안한다. 여기서는 pairing 연산을 적게 사용하고 pairing에 사용되는 군으로 사상되는 해쉬 함수를 적게 사용하기 때문에 이전 기법보다 효율적이면서도 충분한 안전성을 보장하게 된다.

蒙·元 제국 約會 제도의 변천과 종교

조원희(Cho, Wonhee) 동양사학회 2018 東洋史學硏究 Vol.145 No.-

This article examines the so-called institution yuehui 約會 or the “joint courts,” an institution that was established during the Mongol rule of China in the 13th to 14th century. The “joint courts” indicated a legal procedure in which two or three representatives met together to address a case involving different parties. Previous studies have mostly focused on this system within the larger Yuan-dynasty legal framework, and clarified the institutional characteristics such as the legal procedures. Based on these previous research, this article specifically focuses on the case of the “joint courts” involving religions, such as the Buddhist and Daoists. The main purpose of this article is to emphasize the establishment of this legal institutions, to scrutinize the changes over time, and to examine what factors contributed to these changes. The main examples examined are 1) the establishment of the joint court in 1261, followed by the expansion of the legal rights that the religious groups enjoyed during the period around 1300, and 2) the brief abolition and restoration of the joint court system around 1311 to 1313. Through this examination, I emphasize how the changing regulations regarding the religions and joint court were a result of the continuous interaction between the state and the different religions. The changes were by no means a one-sided decision lead by the state alone. In fact, the changes demonstrate the conflicts, negotiations, and interaction that occurred in the multi-religious and diverse society under the Mongol rule of China.

뭉케 카안 즉위 과정의 재검토를 통해서 보는 『集史』의 편향성

조원희(Wonhee Cho) 한국몽골학회 2021 몽골학 Vol.- No.67

본 논문은 이른바 ‘톨루이 혁명,’ 즉 몽골제국의 카안 위(位)가 칭기스 칸의 셋째 아들 우구데이의 후손에서 네 번째 아들 톨루이의 후손으로 넘어간 시기, 구체적으로 몽골 제국의 3대 카안 구육(재위 1246-1248)의 사망 이후 4대 카안 뭉케 카안으로 넘어가는 과정의 일련 사건을 분석함으로써 『集史』의 편향성을 분석하고자 한다. 주로 『集史』와 『征服者史』의 기록을 분석하여 『集史』의 특징은 무엇인지를 분석하고, 두 사료 간의 차이가 단순히 차이가 아닌 특정한 목적, 즉 뭉케 카안 즉위의 정당성을 강조하기 위한 것이었음을 보았다. 이를 위해서 먼저 『征服者史』와 『集史』의 내용을 자세히 비교 분석 후, 각 사료가 가진 특징을 분석하고, 특히 『集史』의 서술에 포함된 여러 모순을 도출하여 『集史』가 어떤 면에서 신빙성과 정확성이 부족한지, 그리고 궁극적으로 어떤 편향성을 가졌는지 살펴보았다. This article re-examines the so-called Tolui Revolution, i. e. the transition of the Qa’an position from the descendants of Ögödei to Tolui, specifically around the events after the death of Güyuk (r. 1246~1248) to the succession of Möngke (r. 1251~1259). Previous studies have primarily focused on reconstructing the events around the succession of Möngke, mostly assuming that all of the relevant sources are mostly historically reliable sources and paying only limited attention to critically evaluating the reliability or bias of the various sources. Through this re-examination, the study identifies the bias within Rashid al-Din’s Collected Histories (Jāmi at-tavārīkh). This will be done through a close comparison of The History of the World Conqueror of Juvaynī and Rashid al-Din’s Collected Histories, and argue that the difference between the two sources has a significant underlying purpose, namely, the justification of the Möngke’s succession to the degree that it distorts important basic facts. Through this examination, I first identify how Rashid al-Din’s Collected Histories emphasized the justification of Möngke’s succession, while seemingly excluding any challenges from Batu Khan, and emphasizing how the descendants of Ögödei and Chaghatai opposed Möngke. Additionally, I identify multiple examples within the Collected Histories that are inconsistent and factually problematic or confusing. For example, a single person is recorded to have been executed, but later found to be alive; in another example, a descendant of Chaghatai is said to have been punished by Möngke, but later a general is dispatched to keep him in check; in another example, a person reported to be at the grand assembly is later recorded as arriving after the assembly was over. Coincidently (or not), these inconsistencies are only found in the Collected Histories but not in The History of the World Conqueror. Based on these examples, I argue the seemingly more readable account of Rashid al-Din is internally incoherent with multiple self-contradicting records, and how these inconsistencies serve to show the legitimacy of Möngke’s succession.

몽원 제국 시기 ‘종교’의 정의에 대한 재검토 - 유대인, 白雲宗, 儒人의 비교를 중심으로 -

조원희(Cho, Wonhee) 동양사학회 2019 東洋史學硏究 Vol.148 No.-

This article examines how the ruling Mongols perceived and understood the different “religions,” focusing on the less familiar, the more minor “religions” during the Mongol rule of China. Specifically, it will focus on the Jews, White Cloud Sect (baiyunzong 白雲宗) and the Confucians. Although most modern scholars would generally agree that these three religions would all fit into what we would call “religions,” the analysis in this research demonstrates that the status of each of the three different religions differed significantly. Unlike the Buddhists, Daoists, Christians, and Muslims, the Jews were often treated as a subgroup of the generic “westerners (huihui 回回)” and did not receive the tax exemption privileges. The White Cloud Sect once established themselves as a separate sect from the larger Han Chinese Buddhists, but due to their reliance of influential individuals such as the Yanglianzhenjia and Danba, their influence in the central court quickly diminished after the death of these two figures. In the early days of the Mongol empire, Confucians were often grouped with other religions, but later the Mongol treated them as a group of individuals who could contribute to the Mongol empire through their knowledge and education. In other words, in the eyes of the Mongols, the three different “religions” were not merely the same, and the relationship between each religion and the Mongol state determined each religions fact. And in that sense, I argue that emphasis on the rulers, and focus on the relation between the empire and subjects can be another useful way to approach and analyze “religions” in history.

광열효과를 이용한 초소수성 표면의 공기층 보존에 관한 실험적 연구

조원희(Wonhee Cho),이상준(Sang Joon Lee) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.5

디지털 인문학과 元代史(원대사) 硏究(연구) -中國傳記資料庫(중국전기자료고)(CBDB)의 소개와 전망을 중심으로-

조원희 ( Wonhee Cho ) 중앙아시아학회 2016 中央아시아硏究 Vol.21 No.1

The purpose of this study is to introduce the China Biographical Database Project (CBDB) and discuss the possibilities, limitations and perspectives of using the CBDB on Yuan studies. To examine these questions in detail, it also provides a preliminary case study examining the officials of the 14th century Yuan government. The CBDB is a relational database (RDB) that covers the biographical data of the people from the Tang to Qing dynasty, and includes more than 360,000 personnel. However, in contrast to the relatively more complete and detailed coverage of the Song period, the CBDB coverage on the Yuan solely relies on the Index to Biographical materials of Yuan figures (Yuanren zhuanji ziliao suoyin 元人 傳記資料索引) which leaves a significant amount of room for improvement. Also, the CBDB is not designed to comprehensively record the data of the Yuan personnel, which is evident in the overall shortage of index year data, and lack of alternative romanization for the non-Han personnel of the Yuan. In spite of these limitations, the CBDB is available for free to use, and the data can be easily exported en-mass to other platforms which enables more avenues for research and visualization. In addition to the easily noticeable anecdotal errors, the CBDB revealed significant limitations when attempting to conduct research on the Yuan, as seen in the preliminary case study of the 14th century Yuan officials. In spite of the CBDB’s broader coverage, the factoids included in the DB are both incomplete and misleading. When we compared to the data from the biographies of these officials, we can see that almost half of the officials were from non-Han Chinese background, and that the entry to the government different significantly between the Han and non-Han officials. These facts are not properly reflected in the CBDB In spite of the limitations of the CBDB, we have to remember that digital humanities is still a young and emerging field compared to the traditional humanty studies. Scholars should remain positive on the possibilities and potentials of CBDB, and overall, digital humanities, as a new avenue of research that will supplement, not replace, our traditional humanity studies.

蒙元帝國의 江南 정복 前後 佛敎ㆍ道敎ㆍ基督敎ㆍ摩尼敎 관리 기구의 설립 및 그 함의

趙元熙(Wonhee Cho) 동양사학회 2016 東洋史學硏究 Vol.135 No.-

This paper examines the new religious institutions that the Mongol established around their conquest of the Southern Song dynasty, especially focusing on comparing and contrasting the religious offices and institutions related to the Daoists, Buddhist, Christians and Manichaeans. Although known for their open attitude to the various religions that the Mongol encountered in their conquest, this study highlights that the policies of the Mongols to different religions were not identical and nor did it need to be so. Right after the conquest of Southern Song, the Mongols rewarded the more cooperative and collaborating Orthodox Unity (Zhengyi 正一) Daoists and enabled them to continue their control over the Daoist of the South. In contrast, as the Buddhists of Southern China had no pre-existing institutional religious organization nor any leading collaborative figures, the Mongols delegated control over Buddhism in Southern China to three non-Han Buddhists, and eventually to a Tangut Monk Yang Lianzhenjia 楊璉眞加. Also, as seen in the establishment of the Office for Christian Clergy (Chongfusi 崇福司) in the central government in 1289, the role of the Manichaeans who willingly presented themselves as Christians in the late thirteenth century also played a significant role in the determining what a religion was in the eyes of the ruling Mongols. To the Mongols, the accountability was more important than the difference between the Christians and Manichaeans, and the blending of the two religions are evident in the anecdotes of Marco Polo, tombstone of the bishop in Quanzhou, and the examples found from the Institutions of the Yuan (Yuandianzhang 元典章). In sum, the comparison of the religious policies of the Mongols show that the relation between the Mongols and the religions determined the different policies.

HBase를 이용한 GPS궤적 빅데이터 맵매칭 시스템

조원희 ( Wonhee Cho ),최은미 ( Eunmi Choi ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1

최근 GPS가 기본 탑재된 스마트폰이 활성화된 이후 대량의 GPS궤적 데이터를 전자지도에 매칭하여 분석하는 요구가 대두되고 있다. 그러나 기존에 연구된 맵매칭 기법은 주로 내비게이션용 알고리즘으로 대량의 GPS궤적을 서버에서 분석하기에는 속도 및 시스템 성능의 이슈가 있다. 본 연구는 대표적인 분산 NoSQL DB인 하둡 에코시스템의 HBase를 이용한 맵매칭 시스템에 대한 연구이다. 맵매칭을 위한 전자지도를 HBase탑재하기 위한 테이블 사양을 정의하였고, HBase와 연동하여 분석하는 맵매칭 알고리즘을 제시하고 Java로 구현하여 분석하였다. 이를 통해 대량의 GPS궤적을 NoSQL 기반 방법론을 통하여 효율적으로 빅데이터를 분석하였다.

비정상상태 해석을 이용한 냉각 사이클 내 냉매 분포도 및 성능 분석

조원희(Wonhee Cho),장동수(Dong Soo Jang),이정훈(Jeong Hoon Lee),김용찬(Yongchan Kim) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6

This study aims to develop a transient numerical model for predicting the refrigerant charge distribution and performance of a refrigeration system. A vapor compression system using R600a is analyzed at the start up condition. With system initialization, condenser experiences increase in inlet refrigerant quality and increase in total refrigerant charge, due to the influence of high temperature refrigerant discharged from the compressor. The effect of the refrigerant property at the upstream control volume is seen to properly propagate in the direction of the fluid flow. As the compressor RPM increases, the mass flow rate of the system increases, and the cooling capacity consequently increases.