무동력 토사제거시스템의 현장모형실험

박찬근,이영학,홍석민,이달원 한국농공학회 2019 한국농공학회논문집 Vol.61 No.4

Coastal and fishing facilities are gradually deteriorating in function due to the continual accumulation of soil sediments, which has affected localeconomic activities. Currently, there are many methods to remove soil sediments, but these methods are either a temporary solution or require arepetitive removal of the soil sediments, which is a huge financial burden for the maintenance of the facilities. To solve these problems, this studyproposed a non-power soil cleaning system and evaluated field applicability by carrying out field model tests. The conditions for the evaluation focusedon the drainage-elapsed time and drainage-outflow velocity according to the water level change in the water tank. In the field test, silty clay and sandwere separately installed, and sedimentation soil removal test was practiced. As a result, the system was verified to have a sufficient outflow velocityfor the removal of soil sediments. In addition, a generalization equation that can be used in different regions of the tide was suggested in this study. These results will greatly contribute to removing soil sediments in ports and dike gate facilities on the southwest coast. Since the system is aneco-friendly technology that does not require additional energy, thus it is expected to contribute to maintenance of sustainable facility performance aswell as economic effect in the future.

The Comparison of two Nonparametric Tests in some Distributions

박찬근 한국자료분석학회 2006 Journal of the Korean Data Analysis Society Vol.8 No.3

We Compare powers of the nonparametric tests, Mann-Whitney test and Median test, under a variety of population distributions using a simulation study. Both tests require that the two underlying populations have the same variance, but this assumption was relaxed in the comparisons. We consider the following types of distributions : Normal, Uniform, Exponential, and Cauchy. Also, to investigate th effect of location shifts in mixture distribution, we use the mixture of N(0,1) and N(3,36) Each test is performed 5,000 times under the same conditions.

Asymptotic Overfitting Probabilities of some Model Selection Criteria in Large Samples

박찬근,조영석 한국자료분석학회 2007 Journal of the Korean Data Analysis Society Vol.9 No.3

We look at overfitting in large samples by obtaining asymptotic probabilities of some model selection criteria, which are AIC, AICc, AICu, SIC, HQ, HQc, Cp, FPE, and FPEu. Asymptotic Overfitting probabilities refer to comparing one overfitted model of order k_{*} +L to the reduced model of order k_{*}. We make use of the following fact : As n rarrow INF and where k_{*} and L are fixed, {chi_{ n-k_{*} -L}^{2}} over { n-k_{*} -L} rarrow 1. It is clear that AIC, AICc, FPE and Cp are not constant criteria, since their probabilities of overfitting are not 0. But SIC, HQ, and HQc are consistent and thus do have 0 probability of overfitting.

Comparisons of Overfitting Probabilities of some Model Selection Criteria in Small Samples

박찬근 한국자료분석학회 2006 Journal of the Korean Data Analysis Society Vol.8 No.4

We calculated probabilities of overfitting of some model selection criteria, which are AIC, AICc, AICu, SIC, HQ, HQc, Cp, FPE, and FPEu when the sample sizes are 25, 35, 50, and 100. And then, compared these probabilities to find some patterns of overfitting probabilities in some model selection criteria. Overfitting refers to comparing one overfitted model of order k_* + L to the reduced model of order k_*. And suppose there is a true model order k_* and we fit a candidate model of order k_* + L where L>0

반도체 테스트 공정 내 Test Program Loading 프로세스 제거에 따른 효과 연구

박찬근,박기환,나걸,최경식,장윤석 한국경영과학회 2015 한국경영과학회 학술대회논문집 Vol.2015 No.4

배수문에서 실내모형실험에 의한 무동력 토사제거시스템의 수리 특성

박찬근,오범환,이달원,Park, Chan Keun,Oh, Beom Hwan,Lee, Dal Won 한국농공학회 2014 한국농공학회논문집 Vol.56 No.5

In this study, the large-scale hydraulic model test was performed to investigate the hydraulic characteristics for development of the non-power soil cleaning and keeping system at the dike gate. The outlet height, outflow number, outflow discharge, and outflow cycle were compared and analyzed. The non-power soil cleaning and keeping system was most effective at 11.2 mm in the outlet height. And then the mean outflow cycle was 1.09 sec, and the mean outflow discharge was $0.00164m^3/s$. The total outflow number increased gradually as the water level of a water tank increased, and the outlet height decreased. As a level of water tank decreased, the mean outflow cycle was lengthened, and the unit outflow discharge increased. This result showed this system was most effective. To remove the silty clay deposited in facilities, the methods of excavation, dredging, high pressure washing, etc have been applied to the tidal facilities such as land reclamation, a small size fishing port, and a harbor for maintenance. However, this is extremely cost-ineffective, whereas the non-power soil cleaning and keeping system will bring about an enormously positive economic effect. In addition, when the non-power soil cleaning and keeping system is applied to the dike gate of land reclamation, a thorough examination of the local tidal data and the careful system planning are required to prevent the disaster damage caused by flooding.

淸朝 道光 연간의 銀에 대한 관념과 정책 - 洋錢과 ‘倣鑄洋銀’을 중심으로 -

박찬근 동양사학회 2022 동양사학회 학술대회 발표논문집 Vol.2022 No.4

18~19세기 淸代 錢糧의 錢納과 지방재정

박찬근 명청사학회 2020 명청사연구 Vol.0 No.54

The Qing Dynasty has been opening the path of tax payment in coins(‘錢納’) since Shunzhi period. Initially, 錢納 was allowed in the name of activating the circulation of coins. In 1733, For the convenience of the people, Yongzheng Emperor continued to allow 錢納, and a relatively specific standard was established by limiting the total amount of tax to be paid to less than 1/10 taels. However, during the Qianlong period, each provinces showed differences in the practice of 錢納 differently from the principles according to local circumstances. This trend is gradually accelerating, and it seems that during the year of Jiaqing and Daoguang, a wider range of 錢納 was implemented. The reason that 錢納 was expanded was because 錢納 became an additional income for local finance. Since each province of the Qing Dynasty had to provide voluntary expenses for local expenditures even through the tānjuān(‘攤捐’), they collected more by carrying out 錢納 regardless of whether silver was expensive or cheap. The problem lies in the way the emperor and the Board of Revenue deal with local governments who use the local facts and ignore the principles suggested by the dynasty. During all periods of Qianlong, Jiaqing, and Daoguang, inspectors have accused the facts of taxation that are inconsistent with the rules of the dynasty. Each time, the emperor referred to the principles of the dynasty and ordered the provincial officials to be strictly control or to investigate the actual situation. Provincial officials acted according to the emperor's orders, but at every opportunity, they professed the inevitability of local circumstances, and gradually devised a method that was different from the principles of the dynasty. In this process, the emperor understands the local situation through provincial officials, and appears to condone the other administrative methods and principles of the province(‘省例’). I think it is about finding a balance between punishment and acquiescence by getting a report of the truth through inspectors, understanding the situation through provincial officials. It can be seen that the local situation, which differs from the principles of the dynasty, was not necessarily a point to be recognized as a slackness of discipline of local government. The unavoidable circumstances recognized by the emperor, provincial officials, and local officials in relation to the management of local finances could lead to the emperor's acquiescence. However, the emperor always had the power to draw swords and cruelly punish local officials who violate the rules of the dynasty, and throughout the Qing Dynasty, it can be seen that in certain cases. On the border between punishment and acquiescence, the standard consensus(‘公議’) of the rulers seems to be lurking. At least, the ‘公議’ seen through the issues of local financial management and 錢納 dealt with in this paper had a great relationship with whether it actually harmed or provided convenience to small-famers(‘小戶’). In a situation where it was inevitable to obtain the need for management from the people, even a practical fúshōu(‘浮收’) or additional collection could be tolerated even if it deviated from the rules of the dynasty to some extent if it was ultimately comfortable for the people. If there was no basis to admit it as an inevitable situation, It was never tolerated to be ultimately judged to be harmful to the people. The line between punishment and acquiescence, where ‘公議’ are located, has the potential to change location gradually depending on the time or issue. in that flexibility, It seems that the foundation for the expansion of local finances has already been established from an early period.

형광등용 전자식 안정기의 고조파 저감에 관한 연구

박찬근,이성근,송동영 한국해양대학교 산업기술연구소 2001 연구논문집 Vol.18 No.-

A conventional type ballast for fluorescent lamp is replaced by an electronic ballast, because of its merit. Electronic ballast have characteristics of rapid start, reduction of energy consumption, stability and so on, but it has harmonic waves by switching in high frequency. This paper proposes a highly power factor investor circuit for fluorescent lamp ballast with two state capacitors. A full-wave rectifier used as a direct current power supply at fluorescent lamp ballast contains a lot of harmonic waves caused by inrush current. Inrush current is generated near the maximum input voltage, when smoothing capacitor is charged. This study proposes a new method to control inrush current by use of charging voltage at pre- state capacitor. From the simulation result, it is confirmed that the THD(Total Harmonic Distortion) is improved about 9.1[%] and the PF(Power Factor) is improved about 2.2[%] in comparison whit that of conventional ballast

19세기 전반기 淸朝 화폐 정책의 원칙과 운용

박찬근 동양사학회 2023 동양사학회 학술대회 발표논문집 Vol.2023 No.2