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정동준,이두용,임성진,Jeong, Dong-Jun,Lee, Du-Yong,Im, Seong-Jin 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.8
As recent production facilities are usually operated with unmanned material-handling system, the development of an efficient schedule with deadlock avoidance becomes a critical problem. Related researches on deadlock avoidance usually focus on real-time control of manufacturing system using deadlock avoidance policy. But little off-line optimization of deadlock-free schedule has been reported. This paper presents an optimization method for deadlock-free scheduling for Job-Shop system with no buffer. The deadlock-free schedule is acquired by the procedure that generates candidate lists of waiting operations, and applies a deadlock avoidance policy. To verify the proposed approach, simulation resultsare presented for minimizing makespan in three problem types. According to the simulation results the effect of each deadlock avoidance policy is dependent on the type of problem. When the proposed LOEM (Last Operation Exclusion Method) is employed, computing time for optimization as well as makespan is reduced.
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정동준 ( Jeong Dongjun ) 백제학회 2022 백제학보 Vol.- No.42
In this article, I tried to understand the diplomacy with Liang(梁) that Baekje developed during the King Muryeong’s reign in connection with the situation of the Chinese continent at that time, and examine the influence of Baekje on expanding its influence on the Yeongsan River and Seomjin River basins and the situation on the Korean Peninsula by linking foreign relations for Goguryeo and diplomacy with Silla. The situation of the Chinese continent changed to the inferiority of Southern Dynasty from the second half of the 5th century, and in the first half of the 6th century, the internal conflict of Beiwei(北魏) created a favorable situation for Liang. Baekje developed diplomacy in response to the situation of the Chinese continent, which was the growth of the Southern Dynasty and the decline of the Northern Dynasty, but failed to send envoys frequently due to internal situations and transportation routes. During the King Muryeong’s reign, Baekje strengthened its control over the Yeongsan River and Seomjin River basins, which led to the foreign strategy to completely territorialize the Yeongsan River and Seomjin River basins and expand its influence in the Gaya region during the King Seong’s reign. The Baekje’s strategy for Goguryeo during the King Muryeong's reign was an offensive shift, and its strategic goal, the Han River basin, was continuously targeted, resulting in tangible results during King Seong's reign. The strategy of offensive shift for Goguryeo was a preemptive attempt to extend the royal authority and secure the legitimacy. Baekje had a discriminatory perception while maintaining friendly relations with Silla. Since the discriminatory perception that contradicts the reality of Silla's rapid growth did not disappear even during the King Seong’s reign, in result Silla plunder the Han River basin due to cracks in friendly relations.
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정동준(Jeong Dong-jun) 한국역사연구회 2008 역사와 현실 Vol.- No.70
This study aims to examine the formation of JwaㆍWoo-bo(左ㆍ右輔), Jwajang (左將 : the supreme commander) and jwapyeong(佐平 : 1st offical rank). It could be said that JwaㆍWoo-bo were lifetime official jobs. Close relatives of king and members from a politically powerful group in the Bu(部 : section), have been appointed to the past of JwaㆍWoo-bo. There might have been possibility that JwaㆍWoo-bo managed the affairs of state and the military. Since the period of king Goi(古爾王 : 234~286), the members from growing powerful group cooperating with the the royal authority were appointed to be JwaㆍWoo-bo. The status of Jwajang was the first specialized official post to manage the whole military affairs. It has been thought heavily that the close relationship between Jwajang and the royal authority. The base to strengthen the royal authority and expand the territory have been made by establishing the post of Jwajang. The historical records saying about the past of Jwapyeong in the period of king Goi tells the fact that some parts of Jwapyeong and Sol groups (率系 : 達率~奈率) as Gwandeung(官等 : official rank) were founded. The post of Jwapyeong, which was set up in the period of king Goi, took charge of the affairs of state. Like the case of Jwajang, it has been relatively emphasized that the relationship between jwapyeong and the royal authority.
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Campbell-Shiller의 동태적 고든 모형이 한국의 아파트시장을 설명할 수 있는가?
정동준(Dong-Joon Jeong) 한국주택학회 2008 주택연구 Vol.16 No.4
Campbell and Shiller(1988)의 동태적 고든 모형이 고려되었다. 첫 번째로, 1986년 1/4분기부터 2008년 2/4분기까지 분기별 통계 자료를 사용하였는데, 이 통계 자료에서는 분기별 임대소득을 회사채수익률로 추정하였다. 이 통계 자료를 사용하면, 동태적 고든 모형은 유의수준 5%내에서 일관되게 기각되지 않았다. 모형은 기각되지 않지만, 이 모형은 정상적인 할인율로서는 아파트가격에 대하여 적절한 가치평가를 하지 못하였다. 두 번째로, 2001년 8월부터 2008년 6월까지 월별 통계 자료를 사용하였는데, 이 통계 자료에서는 월별 임대소득을 월세이율로 추정하였다. 이 통계 자료를 사용하면, 아파트의 초과수익률 회귀분석 검정에서는 현재의 아파트의 초과수익률이 과거의 로그 임대소득-아파트가격 비율, 실질임대소득성장률, 실질이자율들에 의해 예측가능하여, 동태적 고든 모형은 유의수준 1%내에서 기각되었다. 변동성 검정 결과, 분기별 자료와는 다르게 변동성 비율이 전부 1보다 작아 로그 임대소득-아파트가격 비율에 과대변동성이 존재함을 알 수 있었고, 전국아파트나 서울아파트의 경우 모두 유의수준 5%수준에서 모형이 기각되었다. 또한, Wald 검정의 경우에도 대부분 유의수준 5%내에서 모형이 기각되었다. 추가적으로, 동태적 고든 모형은 최근의 아파트가격에 대하여 적절한 가치평가를 하는 것으로 나타났다. 이 모형으로 명목 아파트가격의 과대평가 정도를 계산하면, 전국 아파트의 경우, 2008년 6월 현재 26.9%, 2008년 상반기에는 24.9% 과대평가되어 있고, 서울아파트의 경우, 2008년 6월 현재 27.6%, 2008년 상반기에 24.8% 정도 추정된 펀더멘탈에 비해서 과대평가되어 있음을 구체적으로 보여주었다. The dynamic Gordon model of Campbell and Shiller(1988) was considered. First, the quarterly data set, which rental income was measured by the corporate bond yield, was used for the sample period of 1986Q1~2008Q2. For this quarterly data set, the dynamic Gordon model was not consistently rejected at the 5% significance level. However, the model could not evaluate the apartment price properly with the normal discount rate. Second, the monthly data set, which rental income was measured by the monthly rent rate, was used for the sample period of Agu.2001~Jun.2008. For this monthly data set, the dynamic Gordon model was rejected at the 1% significance level in the apartment excess return regression test. According to the volatility test, differently from the test result of the quarterly data set, there existed the excess volatility of the log rental income-apartment price, and the model was rejected at the 5% significance level. In addition, the model was mostly rejected at the 5% significance level, by the Wald test. Furthermore, the model was able to evaluate the recent apartment price properly. By this model, the nominal nationwide apartment price was overvalued by 26.9% in June and 24.9% in the first half of 2008, and the nominal Seoul apartment price was overvalued by 27.6% in June and 24.8% in the first half of 2008, comparing with the estimated fundamentals.
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정동준(Jeong, Dong-jun) 한국역사연구회 2015 역사와 현실 Vol.- No.97
The Makbu institution(幕府制) was shared by many countries in East Asia, as Chinese dynasties’ title of a General[將軍] became universal, and generated the authority to open a Bu unit[開府權]. Yet each country in East Asia embraced it in different manners. In this article, a closer look into this Chinese institution is attempted in order to enhance our own understanding of Makbu’s functions and roles. The difference between the concept of a Jang-gun and the ‘title’ of a Jang-gun, as well as the meaning and function of both Jang-gun and its adjutant in Baekje, are examined in particular. Meanwhile, also analyzed is the meaning behind the connection between Jang-gun titles and the royalty(kings), which would shed some light upon the concept and political meaning of King’s Makbu. In Chinese dynasties, Jang-gun initially was a mere temporary title. Later, Jang-gun as an official seat for a military officer, and the ‘Jang-gun’ title which was an indicator of one’s status, started to diverge from each other. The latter was essentially a reflection of one’s social status and political rank[官階], but it also retained the meaning of justifying one’s possession of a private army. The custom of having such title was shared by many adjacent countries. The Baekje king received a high-ranking Jang-gun title from Chinese dynasties, and seems to have been authorized to establish his own Bu units[開府權]. Scholars believe that, based upon such authority, the kings would have also named officials to be posted at such Bu units, but at the same time the unit itself would have been run in a Baekje-specific manner. The Jang-gun title of Baekje, as in many other foreign examples, was also a rank and status indicator. It was a system that was regulated by the king and king alone, and worked as a supplementary system for the existing ranking system[官等]. The Baekje adjutants were usually named among Chinese people who came to Baekje as part of the Chinese delegation, whose function was first and foremost diplomatic. In Baekje, the Jang-gun title combined with the royalty system(Wang · Hu System) provided the kings with an authority and military power to subdue resistance against the government’s official taxation. It was another way of controlling the local factions. Low ranking Jang-gun titles were offered to local factions so that they could agree to honor the central’s authority. Chinese adjutants named inside Baekje served as cronies of the king with little to offer on their own. They were made part of the Kings’ Makbu, but later, since the reign of king Dongseong-wang, 12 offices of Naedu(內頭) and Naegwan(內官) replaced them. The adjutant system was run differently from its Chinese counterpart, and shows us the unique nature of Baekje institutions.
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