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      • KCI등재

        흡.배기계통을 포함한 4행정사이클 디젤기관의 성능시뮤레이션 프로그램의 개발

        최재성 한국마린엔지니어링학회 1989 한국마린엔지니어링학회지 Vol.13 No.3

        In this paper, a computer program for simulation of 4 cycle diesel engines including intake and exhaust manifold system is developed. The wave action theory is applied for optimization of the intake and exhaust manifold system. The calculation results of this computer program is finely accurate and agreed well with experimental results. Accordingly, it is recognized that the developed computer program can be utillized very usefully for the design of intake and manifold system. And then, influential factors of the engine performance in the design of intake manifold is numerically investigated by the calculation only. As the results it is concluded that the inertia one of the dynamic effects on the intake and exhaust maninfold affects mainly the engine performance and the pulsation one is a side effect.

      • KCI등재

        설계일관성을 반영한 감가속도 프로파일 개발- 지방부 다차로도로를 중심으로 -

        최재성,이종학,정상민,조원범,김상엽 한국도로학회 2013 한국도로학회논문집 Vol.15 No.6

        PURPOSES: Previous Speed Profile reflects the patterns of speeds in sections of tangents to curves in the roads. However these patterns are uniform of speeds and Acceleration/Deceleration. In oder to supplement these shortcomings. this study made a new profile which can contain factors of Acceleration/Deceleration through theories of Previous Speed Profiles. METHODS : For sakes, this study developed the speed prediction model of Rural Multi-Lane Highways and calculated Acceleration/Deceleration by appling a Polynomial model based on developed speed prediction model. Polynomial model is based on second by second. Acceleration/Deceleration Profile is developed with the various scenarios of road geometric conditions. RESULTS: The longer an ahead tangent length is, The higher an acceleration rate in curve occurs due to wide sight distance. However when there are big speed gaps between two curves, the longer tangent length alleviate acceleration rate. CONCLUSIONS: Acceleration/Deceleration Profile can overview th patterns of speeds and Accelerations/Decelerations in the various road geometric conditions. Also this result will help road designer have a proper guidance to exam a potential geometric conditions where may occur the acceleration/deceleration states.

      • KCI등재

        4실린더 디젤기관 배기계의 최적설계에 관한연구

        최재성 한국마린엔지니어링학회 1999 한국마린엔지니어링학회지 Vol.23 No.3

        Dynamic effect of gas in exhaust manifold influences the volumetric efficiency of the engine. Especially in case of multi-cylinder engine the shape of exhaust manifold is important for the opti-mum design of exhasut manifold complicated. In this paper the effects of exhaust manifold systems on volumetric efficiency were investigated for the 4 cylinder 4 stroke-cycle diesel engine. Volumetric efficiency was calculated by the method of characteristics. The calculation results coincided well the test results. This study showed that the appropriate position and diameter of exhaust manifold branch are important factors in increasing volumetric efficiency and decreasing pumping loss.

      • KCI등재

        $K-{\varepsilon}-{\tau}$ 난류모델을 이용한 축대칭 엔진 실린더내 유동장의 수치해석

        최재성 한국마린엔지니어링학회 1999 한국마린엔지니어링학회지 Vol.23 No.5

        Current turbulence models including modified $K-{\varepsilon}-{\tau}$ turbulence model do not predict compression effect on turbulence accurately in an internal combustion engine. The $K-{\varepsilon}-{\tau}$ turbulence model was suggested to improve the predictability of compression effect by We et al. In this paper a numeri-cal study was performed to clarify the applicability of the $K-{\varepsilon}-{\tau}$ turbulenc model to the calculation of the in-cylinder flow of an axisymmetric engine. THe results using $K-{\varepsilon}-{\tau}$ turbulence model are compared to those from the modified $K-{\varepsilon}-{\tau}$ turbulence model and experimental data. The mean veloc-ity and rms velocity profiles using $K-{\varepsilon}-{\tau}$ turbulence model showed a better agreement with an experimental data than those of modifid $K-{\varepsilon}-e$ turbulence model.

      • KCI등재

        Ordered Logit Model을 이용한 보행자 사고 심각도 요인 분석

        최재성,김상엽,황경성,백승엽 한국도로학회 2009 한국도로학회논문집 Vol.11 No.1

        This paper presents the severity analysis result of the year 2006 national pedestrian crashes using the data base of 37,589 records prepared for the National Police Bureau. A set of attributing factors considered to affect pedestrian crash patterns were selected, and their contributing effects were investigated by applying the Ordered Logit Model. This model was selected because this model has been able to afford satisfactory results when the dependent variable involved ordered severity levels; fatal, injury, and propertydamage-only in this investigation. The investigation has unveiled the followings; First, the pedestrian crash patterns were dependent upon human -driver and pedestrian- characteristics including gender, age, and drinking conditions. Second, other contributing factors included vehicle, roadway geometric, weather, and hour of day characteristics. Third, seasonal effect was not contributive to crash patterns. Finally, the application of the Ordered Logit Model facilitated the ordered severity level analysis of the pedestrian crash data. This paper concludes that conventional wisdom on the pedestrian crash characteristics is largely truthful. However, this conclusion is limited only to the data used in this analysis, and further research is required for its generalization. 본 연구에서는 경찰청에서 제공한 2006년 전국 37,589개의 보행자 사고 자료에서 나타난 보행자 사고 심각도를 분석했다. 이를 위해 본 연구에서는 보행자 사고 심각도에 영향을 미칠 것으로 예상되는 주요 요인을 미리 선정하여, 그 영향을 순서형 로짓 모형(Ordered Logit Model)을 통해 분석했다. 이모형은 사고 심각도와 같이 종속변수가 순서형으로 표시되는 경우 매우 유용한 결과를 제시하는 것으로 알려져 있어서 본 연구에서 사용했다. 본 연구는 다음과 같은 결과를 나타냈다. 첫째, 우리나라 보행자 사고 심각도는 운전자와 보행자로 나타나는 인적요인에서 성별, 나이, 음주여부에 영향을 많이 받는다. 둘째, 기타 요인에는 차량, 도로기하구조, 날씨, 시간대가 포함된다. 셋째, 보행자 사고 심각도는 계절요인과 무관하다. 끝으로, 보행자 사고 심각도 분석을 위해 순서형 로짓 모형을 적용하면 매우 적절한 분석결과를 얻을 수 있다. 결론적으로 본 연구는 우리나라 보행자 사고 심각도는 사람들이 전통적으로 생각하는 것과 같은 방식인 것으로 확인했다. 이 결론은 본 연구에서 사용한 사고자료에 국한한 것이며, 이 결론을 일반화시키려면 추후 연구가 필요하다.

      • KCI등재

        저속박용디젤기관의 순간회전속도 변동에 관한 연구

        최재성,이진욱,이상득,조권회,Choi, Jae-Sung,Lee, Jin-Uk,Lee, Sang-Dug,Cho, Kwon-Hae 한국마린엔지니어링학회 2007 한국마린엔지니어링학회지 Vol.31 No.2

        The variation of the crankshaft speed in a multi-cylinder engine is determined by the resultant gas pressure torque and the torsional deformation of the crankshaft. Under steady state operation, the crankshaft speed has a quasi-periodic variation. For the diagnosis the engine instantaneous speed versus crankshaft angle is utilized. This paper describes a simple measurement method of the engine instantaneous speed versus crankshaft angle using the teeth on the flywheel of the crankshaft. Two non-contacting magnetic pickup combinations detect the crank angle and TDC position for the data acquisition. The results from experiments on a 6 cylinder marine diesel engine demonstrate that the crankshaft speed variation are detected with good resolution. And the crankshaft speed variation is investigated according to the operation conditions. Also, it is confirmed that the engine output measured by EMS can be evaluated larger than the actual value due to TDC position error caused by instantaneous speed variation.

      • ` 99 년도 장애인복지관 평가사업결과와 향후 과제

        최재성 연세대학교 사회복지연구소 2001 연세사회복지연구 Vol.6 No.-

        This paper analyzes the results of organizational evaluation over 36 multi-service centers for the handicapped, which is jointly conducted by Korea Institute for Health and Social Affairs and Ministry of Health and Social Welfare in 1999. Further, a review over evaluation tools and procedure is provided. The evaluation tool is consisted of 200 items for the total scores of 1,000 points. Each center is expected to complete the tool at first with self-evaluation process. After then, on-site evaluation team of 3 members reviews the self-evaluation report submitted and checks reliability and fairness of the report at the center to be evaluated. Client satisfaction is also counted on the evaluation and it is completed by a telephone random survey. The results of analysis present that overall average evaluation scores is 789 points before weighting with client satisfaction scores of 204 points in average, out of 300 points maximum. After applying weighting, the overall average scores increased to 814 points, however this change was not significant enough to affect the ranking. Toward policy implication, the fact that the centers for the blind appear to have apparently low scores, should be carefully reviewed in near future. The gap between the centers for the blind and the other centers seems to very hard to overcome. In addition, adopting accreditation system and developing operation manuals were suggested.

      • KCI등재
      • KCI등재

        지방금융조합 이사의 활동과 지역사회 변화

        최재성 한국민족운동사학회 2015 한국민족운동사연구 Vol.0 No.83

        1907년부터 설립되기 시작해서 1918년 금융조합으로 이름이 바꾸기 전까지 지방금융조합에는 일본인 이사가 배치되었다. 이사는 비상근 조합장을 대신해서 조합의 상무 또는 업무를 집행했다. 그들이 집행했던 업무는 대출과 예금 등 금융기관 업무, 공동구입과 위탁판매, 창고보관 등 관제 협동조합적 업무, 그리고 농사개량과 부업 장려 활동 등 전반에 걸쳐 있었다. 지방금융조합 이사가 벌인 금융기관 활동을 살펴보면, 먼저 조합원 모집과 신용조사인데, 지방금융조합 이사는 지방 관리들의 도움을 받아 조합원을 모집했다. 또 회수가 확실한 조합원에게 대부하기 위해 조합원 신용상태를 조사했다. 다음은 대부 활동에 대한 것인데, 이는 지방금융조합 이사의 활동 가운데 첫 번째로 꼽을 만한 것이었다. 또 예금 업무는 1911년 경부터 조합 내 소규모 저축 조직을 통해 강제 저축을 시작하면서 시작되어 1914년 지방금융조합령 제정과 함께 제도적으로 도입되었다. 그리고 농공은행 매개 및 대리업무인데, 이는 1912년부터 시작되었다. 또 ‘目賀田개혁’의 일환으로 시작된 화폐정리사업에 따라 구화 회수, 보조화 부족현상을 타개하기 위해 지방금융조합은 보조화 보급을 담당했다. 농사개량을 위해 지방금융조합 이사가 벌인 활동은 강습회 개최, 농사 시험전(試作田ㆍ監督田ㆍ模範田) 운영, 농사재료의 배부, 품평회 실시 등이었다. 그리고 부업을 장려하기 위해 지방금융조합 이사는 조합 내에 소규모 조직을 만들고 강습회와 품평회를 개최하여 그 효과가 널리 보급되기를 기도했다. 지방금융조합 이사의 활동이 지역사회에서 일으킨 변화를 보면, 먼저 조합원은 그 틀 속에서 길들여지기 시작했다. 이사가 조합원을 길들이는 방법 중 가장 유효한 무기는 使途 감독이었는데, 그 이유는 허위 대출이 끼어들 여지를 차단하기 위한 것이었다. 그럼에도 불구하고 사도 위반이 발생할 때는 제재를 했고, 반대로 모범조합원에 대한 표창을 통해 선전효과를 노리기도 하였다. 또 조합에 대한 조선 농민의 인식이 바뀌고, 지방금융조합의 증설을 통해 그 그물망이 더욱 촘촘해졌으며, 이사들의 적극적 활동으로 조합원수가 크게 늘어나게 되었다. 이처럼 조합원수가 증가한 것은 그만큼 체제 안으로 포섭된 조선인수가 늘어났음을 의미한 것이다. 지방금융조합 이사의 활동은 지역 사회에서 농업관습을 변화시켰다. 그리하여 수도 벼 보급, 육지면 재배 보급, 일본종 누에의 보급, 바크셔ㆍ요크셔 등 외래종 돼지의 보급, 프리모스로크ㆍ나고야 코친ㆍ레그호온 등 외래종 닭의 보급이 이루어졌다. 또 뽕나무와 과실수 등 나무 묘목, 감자ㆍ무ㆍ배추ㆍ파ㆍ대두 등의 채소 종자도 지방금융조합을 통해 농촌에 보급되었다. Local Associations for Money Circulation had been established to settle a credit crunch generated from the modification of the Korean finance system and the currency reform since 1907. They played roles to make Korean rural communities to be adapted under the economic structure of Japanese Imperialism. They were established by a plan of Megata Tanetaro(目賀田種太郞) who was a financial adviser for Korean Government. Executive directors were dispatched from Japan. They exercised their official duties such as the activities of banking facilities and government- manufactured cooperative associations. And they carried out encouragements of agricultural improvement and profitable sideline. The activities of banking facilities were loan and deposit for members of an association, and an intermediation and an agency of an agricultural and industrial bank, and the withdrawal of the Korean empire government’ coins in circulation and the diffusion of new subsidiary coin. The activities of government-manufactured cooperative associations were cooperative buying and consignment sale. The activities of encouragements of agricultural improvement were holding a training class, installationof an agricultural experiment station, diffusion of farming material and tools, and conducting of an agricultural show. The activities of encouragements of profitable sideline were organizing of small scale group, and holding a training class and an sideline show. The local society was changed by an executive director’s activities. The members of associations were habituated by a credit check, supervision of a loan purpose, and sanction and commendation of the members. And many Koreans were embraced within Japanese Empire’s ruling system by entrance of the Local Association for Money Circulation. And the disseminations of Japanese rice cultivar, the upland cotton, Japanese silkworm, and foreign breeding pigs and foreign chickens raised for breeding were fulfilled by the Local Association for Money Circulation.

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