Gyro 시뮬레이터의 제어기 설계

정종대,류길하,조병관 한국기술교육대학교 2003 論文集 Vol.10 No.1

During the past decade, motion simulators have been effectively used for studying the vehicle interaction and developing vehicle system and components in highly controlled and repeatable test environment. Most of motion simulator use a six degree of freedom stewart platform driven hydraulically. Thanks to a high performance 3D graphic accelerator, the visual system generates high fidelity visual scenes, which are displayed on a monitor on the motion platform. But this type of motion simulator has a limited rotational motion. In this paper we designed a new type motion simulator for endless rotational motion and controller for it. This has four degrees of freedom, three rotational and one vertical motion. The real-time simulation system, based on a personal computer with a digital signal processor, supervises overall operation of the simulator.

고소성 해성점토지반의 압축지수에 대한 비교 연구

정길수,박병수,홍영길,유남재 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A

In this paper, for the highly plastic marine soft clay distributed in west and southern coast of Korean peninsula of Kwangyang and Busan New Port areas, correlation between compression index and other indices representing geotechnical engineering properties such as liquid limit, void ratio and natural water content were analyzed. Appropriate empirical equations of being able to estimate the compressibility of clays in the specific areas were proposed and compared with other existing empirical ones. For analyses of the data and test results, data for marine clays were used from areas of the South Container Port of the Busan New Port, East Breakwater, Passenger Quay, Jungma Reclamation and Reclamation Containment in the 3rd stage in Kwangyang. In order to find the best regression model by using the commercially available software, MS EXCEL 2000, results obtained from the simple linear regression analysis, using the values of liquid limit, initial void ratio and natural water content as independent variables, were compared with the existing empirical equations. Multiple linear regression was also performed to find the best fit regression curves for compression index and other soil properties by combining those independent variables. On the other hands, another software of SPSS for non-linear regression was used to analyze the correlations between compression index and other soil properties.

Oyster-Zeolite 흡착탑을 이용한 하수의 유기물질과 질소제거

정병길,정유진,박성현,최호은,성낙창 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.29 No.1

The objective of this study is to investigated the removal possibility of organic matter and nitrogen contained final effluent of sewage treatment plant using oyster-zeolite adsorption column with waste oyster shell and natural zeolite. The raw water was collected the final effluent of Janglim sewage treatment plant in Busan city. The organic matter and T-N removal efficiency ranged from 2~60% and 38~97%, respectively. In conclusion, oyster-zeolite adsorption column could organic matter and nitrogen removal of final effluent of sewage treatment plant and its economical efficiency is enough because of using recycled waste oyster shell and a cheap natural zeolite.

CWOS와 황토를 이용한 농축·소화슬러지의 탈수성에 관한 연구

정병길,고현웅,주윤경,정유진,이징연 동아대학교 환경문제연구소 2002 硏究報告 Vol.25 No.1

Every year, 190,000 tons of oystershell are wasted from many oyster farms. And the fact that the main components of oystershell are CaO and Al₂O₃ which are chemically similar to those of lime leaded to an assumption that oystershell can be used as raw materials for synthesizing dewatering conditioner. In this study, the Jar-Test and the Bu˝chner funnel test were proceeded for the assessment of dewaterability of a thickened sludge and digested sludge. And TTF(Time To Filter), SRF(Specific Resistence Filtration) and TS(Total Solids) were adopted as the valuation indices of sludge dewaterability. Dewatering conditioner which composed of both oystershell and loess is much dewaterable than the one composed of only oystershell. And in the course of combining of oystershell and loess, the following fact was found that the dewaterability of the combination which have the higher ratio of oystershelI than that of loess is superior. Eventually, the most suitable ratio of dewatering conditioner complex is 9 : 1 (oystershell : loess) in treating not only thickened sludge but also digested sludge. In conclusion, the conditioner synthesized from waste oystershell and loess seems to be used as a splendid alternative material for the dewatering conditioner treating the sludge of sewage.

중수화를 위한 우수처리에 관한 연구

정병길,김미향,박성현,박광현,성낙창 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.28 No.2

The objectives of this study are to evaluate the pH neutralization and NO_(3)^(-), SO_(4)^(2-) adsorption according to the quantity of acid rain, particle diameter and packing height of oyster shells. Acid rain is mainly of anthropogenic origin due to the strong presence of SO_(2) and NOx gases in the atmosphere. Acid rain causes environmental damages, such as lake acidification, negative effects on the vegetation, in particular forests, changes in the chemical composition of solids and in metal mobility. Neutralization of artificial acid rain was enhanced by smaller particle diameter of powdered oyster shells and larger reaction area of packed column. At the initial 12 hours of reaction time, the pH of acid rain increased rapidly. pH neutralization was appeared the highest at the 48 hours of reaction time. The removal of NO_(3)^(-) was observed and the R3 reactor showed highest efficiency of 27.8%. But, SO_(4)^(2-) removal did not observed in this study.

방향성 응고된 이상형 스테인레스강에서 질소첨가가 미세조직에 미치는 영향

최병학,정병길,김진우,고석민,이재현,김상식,김성준 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-

Microstructures in the directionally solidified duplex stainless steels were investigated in order to understand the effect of nitrogen addition. It was found that the addition of nitrogen causes formation of fine precipitates in a matrix and segregation phases of nitrogen in the α/γ interface. Both the fine precipitates and the segregation phases were identified CrN(fcc, a=4.16A˚), which has the coherent phase relationship with bcc α matrix of (200) CrN // (0 1￣ 1) α and (1￣1￣ 1) CrN // ( 3￣ 2￣ 1) α.

통영시와 양산시의 건기시 합류식 하수관거 월류수(CSOs)에 관한 비교연구

김한석,정병길,성낙창 東亞大學校建設技術硏究所 2004 硏究論文集 Vol.28 No.1

Two analysis sites were set up each for this study in the city of Tongyoung, which has the characteristics of a coastal area, and in the city of Yangsan, which has the characteristics of an inland area, water quantity, and water quality and analysis of initial rainfall pollution level on Combined Sewer Overflows(CSOs) were performed. Based on the findings of these analyses. comparing and predicting the characteristics of effluent considering rainfall intensity using SWMM modeling is the purpose of this study. Following the compilation and analysis of data. the selection of analysis sites for preliminary samples, and the confirmation and examination of the sites for the field study, two sites for the analysis of CSOs were chosen each in the city of Tongyoung, a coastal area, and in the city of Yangsan, an inland area. The analysis of water quantity on CSOs was conducted with Flo-Tote(Ⅱ). For analysis parameters. BOD_(5), COD_(Cr), TSS, T-P, and T-N were analyzed 12 times a day. The results of SWMM modeling based on the amount of rainfall of Tongyoung and Yangsan revealed a little difference between measured value and predicted values, but the difference was modest in terms of volume. However, continuous studies on major coefficients and variables considering the amount of rainfall and local characteristics are required for more exact conclusion.

모래다짐말뚝 개량폭에 따른 보강효과에 관한 연구

김시운,정길수,박병수,유남재 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A

In this research, centrifuge model experiments and numerical approach of finite element method to analyze experimental results were performed to investigate the behavior of improved ground with sand compaction piles. One of typical clay minerals, kaolinite powder, were prepared for soft ground in model tests. Jumunjin standard sand was used to sand compaction pile installed in the soft soil. In order to investigate the characteristics of mechanical behavior of sand compaction piles with low replacement ratios, centrifuge model experiments with the replacement ratio of 40%, changing the width of improved area with respect to testing results the width of surcharge loads, were carried out to obtain of bearing capacity, characteristics of load-settlement, vertical stresses acting on the sand pile and the soft soil failure mechanism in improved ground.

소화슬러지 개량제용 CWOS와 기존 소석회와의 비교 연구

고현웅,정병길,성낙창 동아대학교 환경문제연구소 2001 硏究報告 Vol.24 No.2

Even- year, 190,000 tons of oystershell are wasted from many oyster farms And the fact that the main components of oystershell are CaO and Al₂O₃which are chemically similar to those of lime leaded to an assumption that oystershell can be used as raw materials for synthesizing dewatering conditioner. In this study, the Jar-Test and the Bu˝chner funnel test were proceeded for the assessment of dewaterabihty of a thickened sludge and digested sludge. And TTF(Time to filter), SRF(Specific resistence Filtration) and TS(Total Solids) were adopted as the valuation indices of sludge dewaterability Dewatering conditioner which composed of both oystershell and loess is much dewaterable than the one composed of only oystershell. And in the course of combining of oystershell and loess. the following fact was found that the dewaterability of the combination which have the higher ratio of oystershell than that of loess is superior. Eventually, the most suitable ratio of dewatering conditioner complex is 9 : 1 (oystershell : loess) in treating not only thickened sludge but also digested sludge. In conclusion, the conditioner synthesized from waste oystershell and loess seems to be used as a splendid alternative material for the dewatering conditioner treating the sludge of sewage.

온도상승에 따른 마감재의 세공구조 특성에 관한 연구 : 석고보드를 중심으로 Focusing on Gypsum Boards

김광기,박선길,김근허,송병창,정상진 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

On fire, the most significant materials influencing the rise of temperature are finishing materials, and highly combustible materials become the reason of magnifying fires compared to incombustible materials. Recently, gypsum boards are widely used as interior finishing boards for constructions because of their features of absorbing heats and little temperature rising at the early stage of fire. Therefore, in this research, basic data were suggested to secure fireproof stability by investigating interior processing features, which change together with the backside temperature of test materials from Flash Over(within 30 minutes after firing), at which temperature reaches its highest point, to survey the features of materials due to rising temperature in the chase of gypsum boards (general and fireproof gypsum board)