나노다공체 물성 측정을 위한 극저온(20K) 수소 BET 개발 및 응용

박재우,오현철,Park, Jaewoo,Oh, Hyunchul 한국재료학회 2017 한국재료학회지 Vol.27 No.9

With the matters of climate change, energy security and resource depletion, a growing pressure exists to search for replacements for fossil fuels. Among various sustainable energy sources, hydrogen is thought of as a clean energy, and thus efficient hydrogen storage is a major issue. In order to realize efficient and safe hydrogen storage, various porous materials are being explored as solid-states materials for hydrogen storage. For those purposes, it is a prerequisite to characterize a material's textural properties to evaluate its hydrogen storage performance. In general, the textural properties of porous materials are analyzed by the Brunauer-Emmett-Teller (BET) measurement using nitrogen gas as a probe molecule. However, nitrogen BET analysis is sometimes not suitable for materials possessing small pores and surfaces with high curvatures like MOFs because the nitrogen molecule may sometimes be too large to reach the entire porous framework, resulting in an erroneous value. Hence, a smaller probe molecule for BET measurements (such as hydrogen) may be required. In this study, we describe a cost-effective novel cryostat for BET measurement that can reach temperatures below the liquefaction of hydrogen gas. Temperature and cold volume of the cryostat are corrected, and all measurements are validated using a commercial device. In this way, direct observation of the hydrogen adsorption properties is possible, which can translate directly into the determination of textural properties.

고려 성균관의 성립과 운영

박재우 ( Park Jaewoo ) 수선사학회 2020 史林 Vol.0 No.74

King Chungseon of Koryo reorganized Kukhak into Sungkyunkam and Sungkyunkwan during the two bureaucratic reforms. The name called Sungkyun reflected the political perspective of King Chungseon. The Kukhak of King Chungryeol was established with the aim of pursuing the reconstruction of national university. Kukhak was the name used by King Seongjong, who was trying to make bureaucrats who had the Confucian education. This goal is also included in the name of the Kukjakam. The name of Kukjakam was used because it was intended to create a Confucian state by educating the sons of the country through the Confucian education. King Chungseon needed a reorganization of the bureaucracy and recruitment of human resources to implement the reform politics. Sungkyunkam and Sungkyunkwan were the terms chosen from the will to cultivate people talent. Sungkyun of the Zhouli contains the idea of cultivating talented individuals with qualities that are not excessive or lacking. This was the reason King Chungseon adopted the name of Sungkyun. In addition, Koryo had a custom of calling Kukjakam as Sungkyun. So, the term Sungkyun was not unfamiliar. The organization of the national university has also changed as the educational ideology has changed from the ideology of the sons of the country to the ideology of Sungkyun. Sungkyunkwan was made by reducing the organization of Kukhak of the King Chungryeol. King Seongjong's Kukhak and Kukjakam were established as Confucian colleges. However, King Munjong has expanded to include the Faculty of Confucian and the Faculty of Technology. King Chungryeol reorganized the Kukjakam to Kukhak to promote Confucianism, but it was a comprehensive university. The same was true of Sungkyunkam. However, Sungkyunkwan reorganized it from a comprehensive university to a Confucian college. It was reorganized into Kukjakam in King Kongmin, then became Sungkyunkwan, and was passed down to Choseon. The realistic goal of college education was to cultivate talents who can become bureaucrats through the civil service examination. So, the education system and the bureaucracy selection system had to be linked. King Yejong adopted the Song dynasty’s system and placed the Seven lectures for each major, separate from the Faculty of Confucian. The students of the Seven lectures benefited from the civil service examination if they received good grades in conduct, schoolwork, or exams. This system was established in Koryeo society. Sungkyunkwan also inherited these systems. It was because this system came out with the intention of strengthening the Confucian education, and it was suitable as the education method of Sungkyunkwan, the Confucian college.

렌더링 비교 뉴럴넷 기반 가구 조립 설명서 부품의 6D 자세 추정

박재우(Jaewoo Park),강이삭(Isaac Kang),조남익(Nam Ik Cho) 한국방송·미디어공학회 2021 한국방송공학회 학술발표대회 논문집 Vol.2021 No.11

본 논문에서는 뉴럴넷 기반 렌더링 비교 방식을 사용하여 가구 조립 설명서에 표기된 부품의 자세를 추정하는 방법을 제안한다. 제안하는 방법은 부품의 자세를 임의로 가정한 후, 가정한 자세로 투사한 부품의 영상과 설명서의 부품 영상을 비교하여 두 영상의 부품을 일치시키는 자세 변화를 추정하는 방식으로 진행된다. 또한, 설명서에 반복적으로 모델을 적용하여 부품의 자세를 점차적으로 정확하게 보정하는 방식을 사용하였으며, 네트워크의 구성 및 자세 추정에 사용되는 목표 함수를 다양하게 실험하여 성능을 비교하였다. 본 연구에선 IKEA 의 Stefan 의자 조립 설명서의 부품 데이터셋으로 실험을 진행하였으며, 해당 데이터셋에 대하여 제안하는 방법이 정확하게 자세를 보정함을 확인하였다.

연속 가변형 충격흡수기의 감쇠성능 해석

박재우(Jaewoo Park),이동락(Donglark Lee),백운경(Woonkyung Baek) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.2

Analyzing internal structure, flow rate and dynamic behavior characteristics of electronically controlled shock absorber, damping performance limit is identified to comprise the two reciprocal characteristics of ride comfort and handling safety. Regardless of its lower performance than the active suspension control system, the semi-active suspension control system has been taking interest because of its absolutely higher performance than passive suspension system.<br/> Since the previous studies have been concentrated mostly on analytic aspect and survey on the internal structure of the shock absorber remain insufficient, the main discourse of this paper is focused on analyzing the nonlinear shock absorber which varies the damping force of semi-active suspension system and the dynamic characteristics of the solenoid valve, a sort of pressure valve, and proposing the design factors of importance.

무선 근거리 통신망에서의 그룹폴링 프로토콜의 제안과 성능평가

박재우(Jaewoo Park),최재남(Jaenam Choi),김홍윤(Hongyoon Kim),이균하(Kyoonha Lee) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.1

무선 근거리 통신망에 사용되는 매체접근제어 프로토콜에서 충돌허용 프로토콜들은 통신부하의 증가에 따라 성능이 저하되는 문제점이 있고, 무충돌 프로토콜들은 이동국의 수가 늘어남에 따라 성능이 저하되는 문제점이 있다. 본 논문에서는 이러한 문제점들을 개선하기 위해 이동국들을 적절한 그룹의 크기에 따라 그룹을 나누어 폴링함으로써 이동국의 수가 늘어나는 경우에도 폴링 횟수가 높지 않고, 통신부하가 높을 경우에도 폴링 횟수가 크게 증가하지 않게 하는 그룹폴링 방식을 무선 근거리 통신망에 제안하였다. 또한 이 그룹폴링 프로토콜에 대하여 충돌 허용과 무충돌 프로토콜을 각각 대표할 수 있는 CSMA/CD 및 폴링과 비교 분석한 결과 높은 부하에서는 CSMA/CD 보다 우수하고, 낮은 부하에서는 폴링보다 우수한 성능을 보이고 있다.

당사자와 전문가의 관점에서 본 중도 시각장애인 재활교육의 실태와 개선 방안

박재우(Park jaewoo) 한국시각장애교육·재활학회 2019 시각장애연구 Vol.35 No.3

이 연구는 시각장애인의 대다수를 차지하는 중도 시각장애인들의 사회적응 촉진을 위한 성공적인 재활교육의 발전에 토대를 마련하고자 하였다. 이 목적으로 이 연구는 관련 현장 전문가 및 당사자의 인터뷰를 통해 파악된 주관적 경험을 바탕으로 재활교육의 실태와 개선방안을 고찰한 질적 연구를 실시하였다. 이를 통해 연구에 참여한 전문가 및 중도 시각장애인들이 생각하는 재활교육의 의미를 밝히고 이들의 경험을 토대로 하여 재활교육의 문제점을 파악하며 그에 따른 개선방안을 제시하였다. 연구 결과 중도 시각장애인의 성공적인 재활교육을 위해서는 생애주기에 적합한 재활교육의 강화, 개별화 교육의 강화, 긍정적인 심리지원 강화를 위한 융합적인 특수교육적 중재방안의 지원이 핵심 요소로서 제시되었으며 이를 위해 관련 전문가 및 기관들의 네트워크 활성화 및 교육과정에서 융합적인 특수교육적 중재방안에 대한 논의가 연구 과제로 도출되었다. This study aims to lay the groundwork for the development of successful rehabilitation education to promote social adaptation of Persons with adventitious Visual Impairments. For this purpose, this study examined the actual situation and improvement plan of rehabilitation education based on the subjective experiences identified through interviews with relevant field experts and parties. Through this, the purpose of this study was to clarify the meaning of rehabilitation education of experts and visually impaired people in the research, and to identify the problems of rehabilitation education based on their experiences and to suggest the improvement plan accordingly. For successful rehabilitation education for Person with adventitious Visual Impairments, the key element was to strengthen the rehabilitation education suitable for the life cycle, to strengthen the individualization education, and to support the fusional special education intervention plan to enhance the positive psychological support. For this purpose, discussions about the fusional special educational interventions in the curriculum and the network activation of relevant experts and institutions were drawn up as a research project.

서브 픽셀 컨볼루션 신경망을 이용한 고해상도 색차 채널 복원

박재우(Jaewoo Park),조남익(Nam Ik Cho) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.11

[차량운동성능] 연속 가변형 충격흡수기의 감쇠성능 해석

박재우(Jaewoo Park),이동락(Dinglark Lee),백운경(Woonkyung Baek) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2

Regardless of its lower capacity than the active suspension control system, the semi-active suspension control system has been taking interest because of its absolutely higher capacity than passive suspension control system.<br/> Since the previous studies have been concentrated mostly on analytic aspect and survey on the internal structure of the shock absorber remain insufficient, the main discourse of this paper is focused on analyzing the nonlinear shock absorber which varies the damping force of semi-active suspension system and the dynamic characteristics of the solenoid valve, a sort of pressure valve, and proposing the design factors of importance.<br/>

전복 안전성 향상을 위한 고속 버스 차체 개발 프로세스에 관한 연구

박재우(Jaewoo Park),박종찬(Jongchan Park),유승원(Seungwon Yoo) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.2

Bus manufacturers have tested and studied the dynamic collapse behavior of a bus body structure in rollover since UN ECE established ECE Regulation 66 to provide the requirement for the strength of bus structure. In spite of the costly cycles of practical tests, however, it is still a hard task to meet the rollover regulation by means of local reinforcements in the bus structure. Therefore it is necessary to develop a well designed strategy for the rollover strength implemented in the early stage of vehicle development. In this study, the suitable development method for each design stage from a component to complete body structure was considered to make a well-established development process of a bus body structure for rollover safety. For the efficient approach of the concept design stage, a numerical model based on the plastic hinge theory was used instead of detailed shell models. After setting up the concept design for the component size and geometry, the shell model was used to confirm and optimize the whole structure composition. The process developed in this study was practically used as an effective method to predict the rollover behavior of a new bus body structure.

인터넷 검색엔진 마케팅을 활용한 수출촉진 전략에 관한 탐색적 연구

박재우(Jaewoo Park),김승철(Seungchul Kim),이배(Libei) 한국무역학회 2011 한국무역학회 학술대회 Vol.2011 No.4