기술사마당: 제언 -건설기술용역에서의 기술사 위상 제고

박용우,Park, Yong-Woo 한국기술사회 2011 技術士 Vol.44 No.5

Effect of Injection Temperature Condition on Root Mean Square and Peak-to-Valley of F-theta Lens

Yong-Woo Park(박용우),Seong-Min Moon(문성민),Sung-Ki Lyu(류성기) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.6

This study is focused on the root mean square and peak-to-valley based on the injection conditions of the f-theta lens, one of the main components of laser printers and laser scanning systems. The f-theta lens of an aspherical plastic lens requires ultra-preaction. Injection molding is typically used for the mass production of aspherical plastic lenses. In the injection-molding method, the resin in the lens shape is filled with the resin after melting the plastic pellets at a constant temperature and then cooled. It is necessary to maintain a uniform injection molding system to produce high-quality lenses. These injection-molding systems are influenced by different factors, such as pressure, speed, temperature, mold, and cooling. It is possible to obtain a lens that exhibits the optical characteristics required to achieve harmony. We investigated the root mean square and peak-to-valley caused by variations in temperature, a critical parameter in the melting and cooling of plastic resins generated inside and outside the injection mold.

A Study on the Analysis of Injection Molding of F-theta Lens

Yong-Woo Park(박용우),Sung-Min Moon(문성민),Sung-Ki Lyu(류성기) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.1

A Study on Processing and Performance of a 600dpi Master F-theta Lens

Yong-Woo Park(박용우),Seong-Min Moon(문성민),Sung-Ki Lyu(류성기) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.5

This study examines the processing and performance of an f-theta lens, one of the main components used in laser printer and laser scanning systems. To design an f-theta lens, the optical path of the components of the laser scanning unit f-theta lens, cylinder lens, and collimator lens must be identified. The goal after machining the master f-theta lens is to understand the optical properties, root mean square, and peak to valley.

시스템 다이내믹스를 이용한 터널공사비 모델 개발

박용우(Yong-Woo Park),박희성(Hee-Sung Park) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.4

도로건설공사의 주요 구조물인 터널의 경우 건설지역, 지반 환경, 공법 등 다양한 변수에 의해 공사비가 결정된다. 그러나 NATM 터널 초기 공사비를 결정하기 위한 모델에 대한 연구는 부족한 실정이다. 따라서 본 논문은 시스템 사고를 활용하여 터널공사비 예측을 위한 모델을 제시하였다. 기존 문헌 조사를 통해 터널공사비의 영향요인을 파악하고 영향 요인간 상관관계를 고려하여 터널공사비 인과지도를 작성하였다. 그리고 터널공사의 내역서를 활용하여 터널 길이와 굴착량, 암질 등에 의한 터널공사비 변화정도를 분석하였다. 본 연구를 통해 다양한 영향요인을 고려한 NATM 터널공사비 예측에 대한 대안을 제시할 수 있을 것으로 기대한다. Construction cost of tunnel is decided on construction area, site conditions, and construction methods. However, there is few research on developing models to estimate early construction costs. Therefore, this paper presents a model for early estimation tool for NATM tunnel using system thinking. The effect factors for tunnel construction cost were defined and the causal map is developed. Then empirical case analysis were performed to identify the cost difference due to tunnel length, excavation volume, and rock quality. The proposed model would be an alternative to estimate early construction cost of NATM tunnel.

공공건설사업 건설성과 영향요인 가중치 개발

박용우(Yong-Woo Park),박희성(Hee-Sung Park) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.8

공공건설사업은 사람들의 복지 후생 향상과 국가 또는 공공단체 등이 공공자원을 사용하여 시행된다. 따라서 본 논문은 공공건설사업의 성과를 제고시키기 위해 건설성과에 영향을 주는 요인을 파악하였다. 그리고 전문가를 대상으로 AHP를 실시하여 영향요인 별 영향정도를 가중치로 제시하였다. 이를 위해 먼저 영향요인을 건설관련 제도, 프로젝트 관리노력, 프로젝트 환경을 구분하고 세부 영향요인 16개를 제시하였다. 그 결과 적정 예산확보, 합리적 사업시행 절차, 사전 기획 등의 순으로 가중치가 결정되었다. 이는 시공 이전단계의 업무에 해당되는 요인들로 시공이전단계의 관리업무의 중요성을 나타내고 있다. 반면, 자재조달, 작업난이도, 현장 조건 등 시공과 관련된 요인의 중요도는 상대적으로 낮은 것으로 나타났다. 본 연구 결과를 바탕으로 가중치가 높게 나타난 영향요인을 중점 관리하여 건설공사의 성공적인 수행이 가능 할 것이다. Public construction projects are implemented by government or public agencies using public resources to enhance the welfare of the people. Therefore, this paper investigates the impact factors for public construction performance. Then, the weights for impact factors are assigned using AHP. The impact factors are categorized into construction policies, project management efforts, and project environment. Further, 16 detail impact factors are listed in each category. The results show that weights are ordered in appropriate budget, reasonable project implementation process, and pre-project planning. These impact factors are related with pre-construction management activities. However, construction related impact like procurement, work difficulty, and construction environment show relatively low weights. The results can be useful to improve construction performance with managing impact factors showed high weights.

A Study on Thermal Simulation for Adhesive Curing of Cylindrical Cigarettes

Yong-Woo Park(박용우),Seong-Min Moon(문성민),Qi Zhang(장기),Sung-Ki Lyu(류성기) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.11

In this study, cigarettes, which are an essential element in the production of tobacco, are generally not cylindrical. The main materials used for cigarettes are generally hemp and pulp. For the production of cylindrical cigarettes, the cigarettes or cylinders are mounted via gluing. This adhesive is a vinyl acetate emulsion, a high-temperature melt adhesive, and is adhered in a cylindrical shape immediately after being linearly applied to the inner surface of the paper roll or a local part. These adhesives are greatly affected by the atmospheric temperature of the manufacturing space in summer and winter. In the summer, even if the adhesive is temporarily adhered, the coagulation time of the adhesive is long, and problems such as deterioration of the adhesive state occur. in the winter, there is a problem that the temperature of the manufacturing space is low and the adhesive force of the adhesive is poor, resulting in defective adhesive products. In order to solve these problems, another heat transfer device is utilized to cure the remaining adhesive to ensure higher adhesiveness.

21세기 대학선교 어떻게 할 것인가? ; 기독교 채플을 통한 선교

박용우 ( Yong Woo Park ) 한국대학선교학회 2000 대학과 선교 Vol.1 No.-

The majority of Christian universities in Korea require students to earn credits in a liberal arts chapel course in order to fulfill the founding ideologies of the Christian universities. In this thesis, I will first examine freedom of religion and the university chapel courses, then take a look at the identity of the Christian university and the status of the establishment of the chaplain``s office. Finally, I will explore the meaning of the university chapel and the mission being performed through the chapel. Unlike national and public universities or elementary schools, middle schools, and high schools, the Supreme Court ruled that private Christian universities have the right to witness to students through chapel hours as long as it does not violate their rights of freedom of religion. However, chapel classes are different from church services because they are actual college courses. Chapel courses do not set their objectives on nurturing the religious person through conviction and conversion, but rather the focus is to formulate Christian values into people. This is the limit of ministry in universities. In order for a Christian university to properly minister, it must have a firm identity as a Christian university. The identity of the Christian church must be found in the founding goals and the founding reason. There can only be an uncertainty of identity when such acts as privatization by an individual out of greedy intentions occurs. In order for effective chapel services and ministry the chaplain``s office should not need to rely upon the chancellor of the university, but should be able to stand alone. University ministry should not just be the responsibility of the chaplain``s office, but rather the whole university should be involved in this ministry. Also, Christian denominations should actively participate in the ministry. The university chapel courses should enlighten and interpret today``s social issues through the word of God. The university ministry should move away from merely defending the conservative Christian faith, and efforts should be made to move toward bringing forth a new Christian culture. Although many different methods can and should be used in chapel classes, a uniform standard method should be avoided in favor of a method where choices can be made and ideas are free and welcome. Also, in order for a highly effective chapel to suit the needs of college students in the information technology era, the use of multi -media and the development of cyber chapels are needed.

국내·외 사례비교를 통한 교통안전체험교육센터 프로그램의 개선 방안에 관한 연구

박용우 ( Park Yong Woo ),박신형 ( Park Shin Hyoung ),김준년 ( Kim Jun Nyen ),박현수 ( Park Hyun Su ),고민지 ( Koh Min Ji ),박소은 ( Park So Eun ) 한국도로교통공단 2019 교통안전연구 Vol.38 No.-

2009년 국내에 설립된 교통안전체험교육센터는 현장 실습위주의 체험교육을 통해 안전운전 의식을 높이고 사업자 자동차의 교통사고 감소에 기여하고 있다. 하지만 2013년 차체제어 훈련코스 개발 이후 추가 신규 체험교육코스 개발이 이루어지지 않고 있어 재교육생의 체험교육 만족도가 지속적으로 저하하고 있다. 이에 본 연구는 현재 상주와 화성에서 운영하고 있는 교통안전체험교육센터의 교육 프로그램 개선 방안을 제시하는 것을 목적으로 한다. 현재 운영중인 교통안전체험교육센터 프로그램의 현황 분석을 통해 문제점을 파악하였고 해외 사례를 벤치마킹하여 교통안전체험교육센터의 프로그램 개선방안을 제시하였다. 또한, 교통안전체험 교육센터 수강생을 대상으로 시행한 설문조사 결과를 참고하여 프로그램 개선사항을 보완하였다. Established in 2009, Safe Driving Training Programs Center has been associated with raising awareness regarding the importance of safe driving and has contributed to the reduction of traffic accidents through experience education that is focused on field practice. However, no new experience education courses have been developed since the development of “control the test vehicle training course” in 2013. Therefore, education satisfaction level of the students is continuously decreasing. This study thereby suggested ways to improve experience education program of the Safe Driving Training Programs Center, currently operating in Sangju and Hwaseong. Problems were identified by analyzing the current status of the Safe Driving Training Programs Center program that is currently in operation. This study suggested measures to improve the programs by benchmarking overseas cases. In addition, program improvement was supplemented by referring to the survey results conducted on students of the Safe Driving Training Program Center.

동시 텍스트에 나타나는 직시(deixis) 표현과 학습 제재 선정에 대한 연구

박용우 ( Park Yong-woo ) 청람어문교육학회(구 청람어문학회) 2021 청람어문교육 Vol.- No.80

이 연구는 초등학교 동시 텍스트를 학습독자에게 제시함에 있어 학습독자의 수준에 적절한 문학 작품인지를 판단하는 기준으로 직시 표현을 검토하고자 하였다. 동시 텍스트에서 직시 표현은 맥락을 통해 이해할 수 있으므로 투사 과정을 통해 시 감상을 더욱 풍부하게 할 수 있지만, 초등수준의 학습독자에게는 직시 표현이 인지적 부담으로 작용할 수 있다. 이 지점은 직시 표현을 기준으로 동시 텍스트의 수준을 구분할 수 있는 가능성을 내포한다. 이 연구에서는 직시 표현을 인칭 직시, 장소 직시, 시간 직시로 나누어 동시 텍스트의 수준을 구분하였다. 이를 통해 동시 텍스트의 제시 적절성을 판단하였다. 인칭 직시, 장소 직시, 시간 직시의 사용여부와 그 구분의 양상은 학습독자에게 해석의 인지 부담을 줄 것으로 판단하였다. 이에 초등 수준의 학습독자에게 동시 텍스트의 제시 수준을 판단함에 있어 직시 표현이 절대적인 기준이 될 수는 없을지라도 하나의 기준으로써 역할을 할 수 있을 것이다. This study attempted to examine deixis expression as a criterion for determining whether a literary work is appropriate to the level of the learner in presenting children’s poem to learners. Since deixis expression in children’s poem can be understood through context, the appreciation of poetry can be enriched through the projection process, but deixis expression can act as a cognitive burden for elementary-level learners. This point implies the possibility of discriminating the level of children’s poem on the basis of deixis expression. In this study, the level of children's poem was classified by dividing the deixis expression into person deixis, place deixis, and time deixis. Through this, the appropriateness of providing children's poems was judged. The use of person deixis, place deixis, and time deixis, and the pattern of their distinction, was judged to give the learner a cognitive burden of interpretation. Thus, in determining the level of provision of children's poems to elementary-level learners, deixis expression may not be an absolute criterion, but it may serve as another criterion.