드론용 영구자석 BLDC 전동기의 출력특성 향상에 대한 연구

박예지(Ye-Ji Park),민영근(Young-Geun Min),함상환(Sang-Hwan Ham),김솔(Sol Kim),이호준(Ho-Joon Lee),이주(Ju Lee) 대한전기학회 2019 대한전기학회 학술대회 논문집 Vol.2019 No.7

도시농업 활성화를 위한 토양조건별 초본식물의 생육특성

박원제 ( Won Jei Park ),한경환 ( Kyung Hwan Han ),권순효 ( Soon Hyo Kwon ),박미옥 ( Mi Ok Park ),구본학 ( Bon Hak Koo ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2012 한국환경복원기술학회지 Vol.15 No.2

This study is carried out to find the most optimal soil- plant combination in the urban agriculture by analyzing the association of soil base material which is being used in the urban agriculture with the growth of plants. 4 types of easily purchased soil (bed soil(A), animal vermicast soil(B), earth worm soil(C) and matured compost(D)) verified in aspects of effect and safety of soil in terms of growth of crop is selected as experimental soil and B, C, D type soils are mixed with granite soil at the ratio of 7:3. And granite soil (E) is set as a controlled soil and is compared to verify the effect of the experimental mixed soil. Herbaceous plants are classified into the fruit vegetables (Lycopersicon esculentum Mill, and Capsicum annuum L.), leafy vegetables (Brassica campestris L, ssp, Pekinensis and Lactuca sativa L.), medicinal vegetables (Chrysanthemum zawadskii var, latilobum and Liriope platyphylla F, T, Wang & T, Tang), The results of comparison of growth of herbaceous plants in different soil types showed that fruit vegetables and leafy vegetables in general had excellent growth in D type soil mixture and Atypesoil in general and had the poorest growth in E type (controlled) soil. ``Chrysanthemum zawadskii var. latilobum`` had the excellent growth in D type, B type, C type mixed soil and A type soil and E type (controlled) soil are followed in order. In the case of ``Liriope platyphylla F. T. Wang & T. Tang``, the difference in growth by each soil was shown to be insignificant. Therefore, the soil applied in the urban agriculture varies depending on each species of herbaceous plants, but it is considered effective to cultivate herbaceous plant which is economical and productive by using D type mixed soil which can be recycled and inexpensive compared with other experimental soils in the urban agriculture.

古代 王京道路와 幹線道路에 대한 一考察

朴 晸 煥(Jung-hwan, Park) 부산고고학회 2011 고고광장 Vol.- No.9

인류의 역사와 함께한 도로. 사람들은 지역과 지역을 연결하기 위해 도로를 만들었다. 사람들이 왕래하기 위해, 재화나 용역을 운반하기 위해 도로가 건설된 것이다. 우리나라에서 본격적인 도로는 삼국시대부터 조성되기 시작했고, 삼국통일기, 고려, 조선에 걸쳐 사용된 도로도 존재할만큼 강한 연속성을 가지고 있다. 고고학적으로 각 지역간 생산과 분배, 유통 등 경제적, 문화적, 군사적으로 중요함에도 불구하고 우리나라의 고대도로에 대한 연구는 자료의 부족으로 등한시 되어왔던 것이 현실이다. 또 과거 발굴의 경우 도로유구를 다른 유구로 오인, 보고한 경우도 많았을 것으로 생각된다. 2000년 이후 도로에 대한 인식 형성과 발굴조사의 폭발적 증가에 따른 자료의 누적으로 영남지역에서 도로로 확인된 유구도 다수 조사되었고 자료를 정리할 여건이 어느 정도 가능해졌다고 생각된다. 이에 삼국 왕경도로와 영남지역 간선도로를 비교검토, 고대 도로의 구조적 특징과 성격을 규명하기 위한 첫발을 내디디려 한다. This study focuses on relations of the Three Kingdom Road and principal Road. Also this article’s purpose is making clear the difference and concomitant feature of the Three Kingdom Road and principal Road. Mankind constructed a road for carrying goods and service in the remote past. People made Genuine roads since Three Kingdom period in the Korean Peninsula and it has strong continuities from Three Kingdom period to unified Silla, to the Goryeo dynasty, to the Joseon Dynasty. Although archaeologically study of ancient roads is very important in business exchanges, cultural interchange, military objective, researchers have neglected study of ancient roads on account of a lack of resources. In any case, width’s average of the Three Kingdom Road is 13.99m, but principal Road is 5-6m size. The Three Kingdom Road is three times wider than principal Road. The width of drains in the Three Kingdom Road is averagely each 94.17cm, but principal Road has each 66-73.2cm’s drains. This shows middle road of the Three Kingdom Road(Three Kingdom Road have divided into three types : main street, middle road, narrow path) is equal in width of principal Road. It means that principal Road’s width was designed a size of middle road of the Three Kingdom Road. The width of wagon wheel on the Three Kingdom Road is averagely 1.23m, but the width of wagon wheel on principal Road gets 1.85m as average. It shows that the Three Kingdom Road’s cart loads a few supplies, but principal Road’s wagon loads more goods. Anyway research for ancient roads, It’s about to start. Division problem for the Three Kingdoms and debate of the Three Kingdom’s sacle is very important, researchers for the Three Kingdoms and ancient roads must take a profound interest in it

유한차분법에 의한 직교흐름 열교환기 코아의 열전달 성능 해석

朴 容 換(Yong-Hwan Park) 호서대학교 공업기술연구소 1999 공업기술연구 논문집 Vol.18 No.1

국가 장학금과 성적우수 장학금의 심리적 가치 및 저축성향과 소비지출에서 차이에 관한 연구

박 환(Hwan-Park) 산업기술교육훈련학회 2016 산업기술연구논문지 (JITR) Vol.21 No.4

In the present study, a line is drawn between the grade scholarship and state scholarship in an attempt to examine how the student recipients of a scholarship perceive the psychological value of the grant, for what purpose they seek to use it, and what implication such behaviors would have for management of scholarship. To achieve the goals, this research examined existing theories and developed hypotheses. On the basis of 98 questionnaires completed by undergraduate students of researcher-working university, the hypotheses were verified by using t-test of SPSS 18.0. The outcomes of the study could be summed up as follows: It is revealed from the study that the recipients of the grade scholarship feel higher psychological value than those of the state scholarship since the grade scholarship is regarded to be the due price for their efforts whereas the state scholarship is deemed to have little to do with the efforts invested. Stronger tendency is found to spend the grade scholarship for buying hedonic products than utilitarian products. The study also finds that there is little distinction between the grade scholarship and state scholarship in terms of the saving amounts. It seems thus necessary to lead students to spend the grade scholarship for buying utilitarian products needed for promotion of academic performance after saving certain amount of the grade scholarship.

하이브리드 신경회로망 알고리즘을 이용한 실시간 자율적응 제어 시스템 구현

이성수(Sung-Su Lee),김용욱(Yong-Wook Kim),박 환(Hwan Park) 산업기술교육훈련학회 2007 산업기술연구논문지 (JITR) Vol.12 No.1

Neural network is used in many fields of control systems, but input-output patterns of a control system are not easy to by using single feedback neural network controller. it is difficult to get satisfied performance when the changes of rapid load and disturbance are applied. To resolve those problems, this paper proposes a new algorithm of hybrid neural network controller combined with PID controller. The new algorithm uses the neural network instead of activation function to control object at the output node. Therefore, control object is composed of neural network controller unified as activation function, and it supplies the error back propagation path to calculate the error at the output node. As a result, the input-output pattern problem of the controller which is designed by the simple structure of neural network is solved, and real-time learning can be possible in general back propagation algorithm.

자율적응 서보제어 시스템을 위한 샘플링 안정화를 이용한 전문가 PID 제어 시스템 설계

이성수(Seong-Su Lee),김용욱(ong-Wook Kim),박 환(Hwan Park) 산업기술교육훈련학회 2008 산업기술연구논문지 (JITR) Vol.13 No.1

Up to most recently, Servo motors and Induction motors were chiefly controlled by PID controllers for the speed change of acceleration and deceleration on industrial spots. This was because PID controllers are simple in structure and have good transient response characteristic as well as the controllers can easily remove normal state error. However the controlling performances of PID controllers are sensitive to the variation of system parameters and the robustness is low as the PID controllers do not have the capability of fast transient response to load disturbance. Accordingly, the parameters of PID controllers should be determined again to maintain control characteristic when system characteristic varies. In this paper, an expert PID controller by which feedback control gain is determined automatically to fit objective system characteristic even without using a complex algorithm, is proposed. Expert auto tuning algorithm is based on Ziegler-Nichols step response and expert knowledges. The method of the proposed system has the function to acquire the information on objective system through self-learning and adapt to the characteristic of main system, the same as a PID controller, and also have the function to automatically determine the parameters which fit to objective system and be synchronized to it even when load changes rapidly or disturbance is approved.