스마트폰 기술을 이용한 건축공사 안전관리 어플리케이션 모델 개발

김재엽 忠州大學校 2012 한국교통대학교 논문집 Vol.47 No.-

Recently, as the technology based on ubiquitous has been improved following the U Korea strategies of the IT industry in Korea, the application technology using smart phones has begun to stand out in the entire industries. However, there are no organized systems and techniques for safety management of construction. Accordingly, this research aims at suggesting the ‘safety management application model’ using smart phones for rapid and efficient safety management. For the investigation, previous studies related to the existing application of ubiquitous technology to the construction field were analyzed with the standard of frame construction 1 cycle with great importance and higher rate of accidents among different work types at construction site. Afterwards, the actual condition and problems of present safety management system were identified through the interviews by professionals at the site. Based on the problems, S-App model, the safety management application using smart phones, was suggested. On the ground of this, S-App was introduced to the safety management schedule of a typical construction site in Korea and a case study was conducted to verify its effectiveness.

단독주택용 태양광발전설비의 유지관리에 관한 연구

김재엽 한국교통대학교 2015 한국교통대학교 논문집 Vol.50 No.-

Many photovoltaic equipments had been supplied owing to the government subsidy. But, the maintenance of PV equipment was not considered carefully. The subject was 202 households: 84% of the households required the maintenance. This study investigated not only maintenance methods of photovoltaic equipment for detached houses but also effects of the methods. The maintenance methods were: Maintenance companies provided users with maintenance services to be paid. And, maintenance companies provided not only Korea Energy Management Corporation but also local governments with maintenance information to be paid according to the maintenance. Photovoltaic equipment was likely to increase generation owing to maintenance method. And, job opportunity could be made to produce social effects.

통합발주체계 도입을 위한 한국형 다자간계약 모델 개발

김재엽 한국교통대학교 2014 한국교통대학교 논문집 Vol.49 No.-

In carrying on modern construction projects, people have made effort in enhancing productivity of industry through collaboration in the early stage of projects because they have become larger and more complicated and promoting management efficiency and value increasing. Recently, since the integrated project delivery (IPD) was presented by the American Institute of Architects, it has been becoming a new paradigm. IPD is a management method where the participants carrying on the projects operate them by integrating such projects on the whole from the early stage of design to the completion of construction. This paper analyzes multi-party agreements and their guidelines of three types of documents: AGC-ConsensusDOCS of USA and CIB-The Latham Report of England based on AIA-C191 of USA. The purpose of this analysis is to identify their merits in common and suggest Korean style new model of multi-party agreement by strengthening existing mutual cooperation of the parties that is shown in customary practice in entering into agreements in Korea-stronger-weaker relationship and nepotism.

철근콘크리트보의 보강공법별 경제성 평가에 관한 연구

김재엽 韓國交通大學校 2013 한국교통대학교 논문집 Vol.48 No.-

The structures in Korea need carrying out reinforcement work for the structure materials because their weight has increased owing to the aging of buildings or change in their uses. Most of structures demanding repair and reinforcement have the rahmen structure of over ten-year old ferroconcrete. In particular, the reinforcement work for crossbeam materials proved to be most frequently carried out. Accordingly, this research aims at analyzing the economic feasibility of the assumed model of reinforced crossbeam of rahmen structure and at using it as reference data for practical work at the field. For the research, the existing data related to reinforcement methods and the cases of repair and reinforcement were examined and analyzed, and the economic feasibility of the assumed model designed based on the enterprises’ construction cost estimation. Based on the analyzed economic feasibility, the most effective reinforcement method for crossbeam materials among ferroconcrete rahmen structures was suggested and examined. The research result revealed that the carbon fiber reinforcement method had more excellent economic feasibility than other methods among three reinforcement methods. However, unlike the iron plate reinforcement method, which is the most frequently used construction method, it is difficult to purchase materials and to secure the adhesive capability and the power of the reinforcement materials after reinforcement, which is concluded to be the reason why the carbon fiber reinforcement method with better economic feasibility is less adopted to the field than the iron plate reinforcement method.

주택용 태양광발전설비의 유지관리 절차 및 주체 분석

김재엽 한국교통대학교 2017 한국교통대학교 논문집 Vol.52 No.-

Distribution of photovoltaic device for housings is on the steady rise, but small photovoltaic equipment for houses are hardly maintained. This is a basic study for maintaining photovoltaic device for housings. It aimed to develop its procedures and analyze those doing maintenance. For maintenance procedure, contents on washing, inspection and snow clearance were developed. Various standards used domestically and overseas, maintenance companies’work procedures and etc were analyzed and developed. For those doing maintenance, 22 experts’ opinions were summed up and analyzed. The analysis showed that cooperation with specialized firms with users at center is the most desirable for small facilities.

무산소-호기 반응기의 유기물과 질소 제거모델 개발

안송엽,김환홍,소재철,권희태 원광대학교 2001 論文集 Vol.26 No.-

본 논문은 무산소-호기 유동상 반응기에서 폐수의 유기물과 질소제거에 관한 것을 나타내었으며, 이 공정은 두 개의 반응기 안에서 질산화와 탈질화로 얻어지는 제거율 결과를 모형화하여 검토하였다. 무산소조의 미생물 농도가 모형식으로 표현되면 -2079.898V2 - 202.2029(H/A) + 1123이고, BOD removal = -0.00613 HRT2 + 0.4014HRT + 46.993 and NO3-N removal = -0.0029 HRT2 + 0.1872 HRT + 77.45 로 각각 표현되어진다. 이러한 실험치는 모형치와 비슷한 값을 가진다고 할 수 있으며, 이 결과는 다른 방법에도 적용이 가능하다고 판단된다. This paper aims to get rid of BOD and nitrogen in wastewater as the anoxic-aerobic fluidized bed. The process for the removal of nitrogen consists of nitrification and denitrification in two reactors. The estimated formula for, Anoxic are Biomass concentration = -2079.898V2- 202.2029(H/A) + 1123, BOD removal = -0.00613 HRT2 + 0.4014HRT + 46.993 and NO3-N removal = -0.0029 HRT2 + 0.1872 HRT + 77.45. The experimental values are similar to values of estimated formula. Therefore, this result is able to adapt the other cases.

Complex法에 의한 配水管網의 最適管徑 決定에 관한 硏究

安松燁,金洙源,蘇在喆 圓光大學校 1986 論文集 Vol.20 No.2

Box-complex 알고리즘을 적용하여 배수관망의 관 포설경비를 목적함수로, 유속과 관경을 제약조건으로 고려하여 관경을 최적화 하였으며, 본 연구에 적용된 알고리즘의 적용가능성, 안정성 및 효율성등을 분석하여 다음과 같은 결과를 얻었다. 1. Box-Complex 알고리즘은 배수관망의 설계에 매우 적합한 최적화 기법이다. 2. 지반고가 일정한 배수관망의 관경을 최적화하여 최적관경을 얻었으므로 지반고가 일정하지 않은 배수관망이나 대형의 관망 최적화에도 용이하게 적용할 수 있을 것이다. 3. 도송배수관로와 배수관망을 연결하여 최적관경을 구하면 배수관망 자체만의 최적화에서 구한 관경보다 경제적인 관경을 얻을 수 있다고 사료된다. 4. 본 연구에서 적용한 알고리즘은 초기치를 달리하여도 목적함수값이 변하지 않고 짧은 시간내에 일정한 값에 수렴하므로 적용성이 있고 효율적이며 안정성이 있는 알고리즘으로 사료된다. This study deals with the optimization of pipe diameter applying the Box-Complex algorithm and considering the velocity of flow and pipe diameter as constraints with the pipe paving cost of water pipe networks as their objective function. Then this study obtains the results as follows, analyzing the applicational possibility, stability and efficiency of algorithm which are applied to this study. 1. A Box-Complex algorithm is a very suitable optimization technique for the optimal design of the water pipe networks. 2. The optimal pipe diameter will be applied easily for the optimization of the large scale water pipe networks or the water pipe networks that the ground height inclines because the optimal pipe diameter is attained through the optimization of pipe diameter of water pipe networks that the ground height is horizontal. 3. If the optimal pipe diameter is attained through the linking of a water pipe channel with pipe networks, then it will be more economical pipe diameter than the one which is attained from the optimization of pipe networks itself. 4. The algorithm applied to this study is applicable, efficient and stable algorithm because it converges to a constant value within a shore time and does not change its objective function value through the initial value of the design valuables is different.

정보원 출처에 따른 광고태도의 매개효과

김재영,유승엽 한국방송광고공사 2001 광고연구 Vol.0 No.53

본 연구는 네 가지의 서로 다른 소비자 만족주장 정보원에 따른 실험자극물(인쇄광고물)을 제작하여 광고에 대한 태도가 소비자 행동에 미치는 영향을 규명하고자 이루어졌다. 즉 고관여 이성제품과 저관여 이성제품에 따라 소비자 만족주장의 정보원이 상이할 경우, 광고에 대한 태도의 중개효과를 밝혀내고, 광고에 대한 태도가 상표에 대한 인지, 상표에 대한 태도 및 구매의도에 어떻게 중개역할을 하여 소비자 태도변화에 작용하는 가를 알아보고자 하였다. 광고에 대한 태도의 중개효과를 알아보기 위해 MacKenzie 등이 제시하였던 Aad의 중개역할모델을 사용하였다. 본 연구의 실험설계는 2×4 요인설계를 사용하였다. 즉 제품은 고관여와 저관여 이성제품(컴퓨터와 치약)의 두 종류를 사용하였으며, 소비자 만족주장 정보원은 네 가지 종류, 예컨대 정보원 없음, 개인보증 자극물, 회사조사결과 자극물 및 과학적 조사결과 자극물이었다. 소비자 만족주장 정보원 출처에 따른 광고태도의 매개효과를 알아보기 위해 공변량 구조분석을 실시하였다. 구조모델의 적합도 평가기준으로는 RMR, GFI, AGFI 및 NFI 지수를 이용하였다. 본 연구의 결과는 Aad가 소비자들의 태도변화에 상당한 영향력을 미칠 것이라고 가정한 선행연구들의 연구결과와 그 맥을 같이한다고 할 수 있다. 즉 소비자만족의 상이한 조건에도 불구하고Aad를 통해 Ab, 그리고 PI로 일치되게 나타났다. 그러나 일부 실험집단에서는 적합모델이 탐색되지 못하였을 뿐만 아니라 적합모델이 탐색되었다 하더라도 상이한 대안적 모델이 동시에 만족되는 결과가 산출되었다. 따라서 왜 이러한 결과가 산출되었는가에 대한후속연구가 필요하다고 하겠다. This study is to find the best model of 4 hypotheses on mediating role of attitude toward the ad(Aad) suggested MacKenzie etc. Ad manipulated as experimental stimulation on 8 appeals of comsumer’s satisfaction for high/low involvement was answered by 246 subjects. Ad message source have a 4 appeal types of consumer’s satisfaction. product involvement and message processing involvement were respectively set up by high and low in this study. LISREL(8.12) for covariance structure analysis was available to test the mediating role of Aad with thinking products would make an experiment. At the result of analyzing 4 hypotheses already suggested by 4 experimental conditions to find the best fit path model, it turned out that the reciprocal mediation hypothesis was the best hypothesis in every condition except just one. In case of path effect between each variable, although there are different conditions, we can find that trough Aad, it accords with Ab and PI. However, in other experimental group, it was proved that the succession Ab → Aad is more strongly influencing than Ad → Ab. It is necessary to illuminate in the following study whether the result of this study has it’s problem in measurement skill or in other external variable.

연마방법에 따른 탄성의치의 표면거칠기와 Candida albicans의 부착율 변화

오주원,서재민,안승근,박주미,강철균,송광엽 대한치과보철학회 2012 대한치과보철학회지 Vol.50 No.2

연구 목적: 본 연구는 탄성의치 제작 시 주로 사용되는 polyamide를 수종의 연마방법을 사용하여 처리 후 Candida albicans의 부착정도와 표면거칠기를 비교하고자 하였다. 연구 재료 및 방법: 25×15×2 mm 크기의 polyamide 시편을 4군으로 나누어 연마재를 사용하여 기공용 lathe 연마하는 방법(기공실내 연마방법)과 각기 다른 2종의 실리콘 포인트로 진료실내 연마하는 방법, 그리고 실리콘포인트 연마 후 pumice로 연마하는 방법으로 처리하였다. C. albicans의 부착성을 평가하기 위해 5×106 CFU/ml의 C. albicans 현탁액에 시편을 2시간 동안 침적하였고 5회 수세처리 후 한천배지에서 배양하였다. 그리고 주사전자 현미경(JSM-5900, JEOL LTd., Tokyo, Japan) 촬영을 시행하였다. Profilometer (Surf-pak; Kawasaki, Japan)를 이용하여 표면거칠기를 측정하였고 통계처리를 위하여 SPSS 18.0 프로그램을 사용하였다. 일원변량분석으로 비교 분석하였고 사후검증은 C. albicans의 부착성 검증을 위해 Scheffe test를 시행하였으며 표면조도검증을 위해 Tamhane’s T2 test를 시행하였다(α=.01). 결과: 최대 거칠기 값을 보인 군은 2단계의 연마용 버를 사용한 것으로 0.32 ㎛±0.10 값을 나타냈으며, 가장 낮은 거칠기 값을 보인 것은 tungsten carbide를 사용하지 않고 기공용 lathe로만 연마를 한 군으로 0.02 ㎛±0.00의 거칠기 값을 나타냈다. C. albicans 부착 실험에서는 기공용 lathe만을 이용한 연마방법이 가장 적은 부착수를 보였으며 다른 세 군과 유의한 차이가 발견되었다(P<.01). 결론: 표면거칠기 및 미생물 부착능 실험 결과 기공실 연마만을 시행한 경우 유의하게 낮은 거칠기 값과 부착율을 보였다. Pumice로 추가 연마한 군은 진료실연마를 시행한 군에 비해 낮은 거칠기 값을 보였으나 C. albicans 부착에 있어서는 유의한 차이를 보이지 않았다(P>.01). Purpose: The purpose of this study was to compare the effect of 3 chairside polishing methods and laboratory polishing methods on surface roughness and C. albicans adhesion of polyamide denture base. Materials and methods: Using contact profilometer, the surface of polyamide specimens (25×15×2 mm) was studied after conventional polishing without finishing and after chiarside polishing with 2 chiarside polishing kits and chairside-pumice polishing following finishing with tungsten carbide bur. To evaluate the adhesion of C. albicans, C. albicans suspension was overlayed on the test specimen. And the specimens were incubated for 2 hours. Imprint culture method was achieved and counted the colony on the agar plate. Polished polyamide were evaluated using a scanning electron microscope. The statistics were conducted using one-way ANOVA and in case of difference, Scheffe test and Tamhane’s T2 test were used. Results: Surface roughness (Ra) of surfaces polished with 2 chairside polishing kits had higher than conventional polishing and pumice polishing. The highest roughness value was 0.32 ± 0.10 ㎛, and the lowest was 0.02 ± 0.00 ㎛. The adhesion of C. albicans on the specimens polished with chairside polishing group and pumice polishing group were increased than conventional polishing group (P<.01). Conclusion: Conventional laboratory polishing was found to produce the smoothest surface and the lowest adhesion of C. albicans. Two groups polished with Chairside polishing kits were similar with respect to surface roughness. Surface of the specimen polished with pumice is significantly smoother than 2 chairside polishing groups, but the result of C. albicans adhesion is that group polished with pumice was similar with 2 chairside polishing groups (P>.01).

공작 기계의 신뢰성 평가를 위한 웹 기반 해석 프로그램 개발

강태한,김봉석,이수훈,송준엽,강재훈 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

Web-based analysis programs for reliability assessment of machine tools were developed in this study. First, the reliability data analysis program was developed to search for failure rate using failure data and reliability test data of mechanical part. Second, failure mode analysis was developed through performance tests like circular movement test vibration test for machine tools. This analysis program shows correlation between failure mode and performance test result. Third, tool life was predicted by correlation between flank wear and cutting time, using the extended Taylor tool life equation in turning data and the equivalently converted equation in order to apply ball endmill data to Taylor tool life equation in milling data. All the information related to input and result data can be stored in theses programs.