초기 비틀림각을 갖는 회전 외팔보의 굽힘 진동

박정훈,유홍희,Park, Jung-Hun,Yoo, Hong-Hee 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.7

Equations of chordwise and flapwise bending motions of pretwisted rotatin cantilever beams are derived. The two motions are coupled to each other due to the pretwist angle of the beam cross section. As the angular speed, hub radius ratio, and pretwist angle vary, the vibration characteristics of the beam change. It is found that engenvalue loci veering phenomena and associated mode shape variations occur between two vibration modes due to the pretwist angle. The effect of the pretwist angle on the critical angular speed is also investigated.

회전구조물의 진동 해석 및 실험

박정훈,유홍희,Park, Jung-Hun,Yoo, Hong-Hee 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.2

Comparative study on the analysis and experiment for the vibration of a rotating cantilever structure was made in this paper. Analysis results were obtained by using the modeling method which was developed in the previous work. The cross-section thickness variation due to the sensor attachment was additionally considered. In order to verify the accuracy of the analysis results, exerimental results were obtained. The analysis and experimental results were found to be in a good agreement. It was also shown that the aerodynamic and cross-section thickness variation effects significantly influenced the dynamic characteristics of the rotating structure.

수원시 수계에 분포하는 식물플랑크톤의 종조성 및 영양단계

박정훈,문병렬,이옥민,Park, Jung-Hun,Moon, Byeong-Ryeol,Lee, Ok-Min 한국조류학회(藻類) 2006 ALGAE Vol.21 No.2

Seasonal compositions, standing crops and trophic status of phytoplankton were investigated at 13 sites of Suwon-si, Gyeonggi-do from June, 2004 to March, 2005. Total of 304 taxa were found, and classified as 4 phylums 4 classes 13 orders 36 families 93 genera 246 species 47 varieties 8 forms and 3 unidentified species by Engler’s classification system. Judged by standing crops of phytoplakton, algal blooming was observed at every sampling sites except Pajang reservoir, Hagwanggyo reservoir, Suwon-cheon and Woncheon-cheon throughtout the whole study periods. While Hagwanggyo reservoir appeared to be in mesotrophic or oligomesotrophic status, most of the remaining sampling sites in Suwon-si were in eutrophic status according to trophic status index. In this study, the most abundant taxa revealed in eutrophic status were Anabaena circinalis, Pandorina morum, Scenedesmus acuminatus, and S. quadricauda as previously reported as the most abundant taxa in eutrophic status. But Navicula cryptocephala and Cyclotella stelligera, reported as the abundant taxa of mesotrophic and oligomesotrophic status, respectively, occurred in eutrophic status in this study.

고속비행체 냉각을 위한 연료의 흡열분해 반응에서 제올라이트 촉매 영향연구

박정훈(Jung Hoon Park),정병준(Byeong Jun Jeong),신민창(Min Chang Shin),정지훈(Ji Hoon Jung),정병훈(Byung Hun Jeong) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.11

노인주거보장정책에 관한 비교연구: 독일, 영국, 스웨덴 사례를 중심으로

박정훈 ( Park Jung Hun ),박근영 ( Park Keun Young ),심경수 ( Sim Kyung Soo ) 아시아문화학술원 2017 인문사회 21 Vol.8 No.4

본 연구에서는 노인의 주거문제에 대응하기 위한 독일, 영국, 스웨덴의 노인주거보장정책에 대해 길버트와 터렐의 모형을 적용시켜 비교분석하였다. 연구결과 한국에 비해 역사적으로 이미 고령화를 경험한 서구 복지국가들은 각 국가의 상황에 적합한 다양한 주거시설 및 관련 서비스의 제공을 통해 노인의 주거문제에 대응하고 있었다. 가령, 독일은 개인의 연금수준에 근거한 다양한 주거서비스의 제공, 영국은 기존의 임대 주택 중심에서 주거환경개선보조금 지원제도의 도입, 마지막으로 스웨덴은 탈시설화를 접목시켜 개인의 거주 지속성 제고로 정책의 전환을 모색하였다. 이를 통해 본 연구에서는 한국의 노인주거문제에 대한 실태조사, 세부기준의 보완, 정책패러다임의 전환, 관련 법제도의 정비 및 재원마련을 위한 사회적 합의 등 체계적인 접근을 제안하였다. In this study, we try out the comparative analysis of the housing policy for the aged based on the model of Gilbert & Terrell in Germany, the UK and Sweden which have been responding to the problem of an aging population. According to the result, we could see that the countries have enforced a diversity of policy and institution regarding the housing for the aged. Second, we find out the problem of Korea concerning the housing policy for the aged on the basis of the three nations. Therefore, this study suggests that the survey of housing problem a matter of the aged, the standard in detail of the institution, the paradigm shift in the housing policies and the systematic approach in the social agreement.

SSAM과 VISSIM 모형을 활용한 상습정체교차로 개선 평가 연구

박정훈(PARK, Jeong Hun),나정무(NA, Jung Moo),윤수영(Yun, Su-Yeong),이승훈(Lee, Seung-Hun),유영선(YOO, Young Sun),변은아(Byeon, Eun-A) 대한교통학회 2013 대한교통학회 학술대회지 Vol.68 No.-

이 연구는 상습정체교차로 개선에 따른 교통사고 변화 정도의 분석을 다루고 있다. 연구의 목적은 교차로에서의 교통사고 증감 여부의 분석을 위해 교통시뮬레이션 및 차량상충 발생 예측 프로그램을 활용하여 사고잦은 상습정체교차로 개선에 따른 교통사고 감소 효과를 적절하게 평가할 수 있는 지표를 제시하고자 한다. 이를 위해 이 연구는 국내 사고잦은 상습정체교차로 51개소를 선정 하여 개선을 실시하고, 그 중 15개소에 대하여 미시교통시뮬레이션 프로그램인 VISSIM과 차량상충 발생 예측 프로그램인 SSAM을 이용하여 개선 전후의 교통사고 증감 여부를 분석하였다. 현실에 가까운 도로상황 및 교통운영상황을 재현하기 위해 차량 평균통행 시간을 기초로 정산을 실시하였고, 연구 분석 결과 상습정체교차로 개선 후 차량 상충횟수가 전체적으로 감소한 것으로 나타났다. 차량 상충횟수를 기반으로 한 교통사고 감소 여부를 예측함으로써 교차로 개선을 통한 서비스수준 분석시 차량 평균제어지체값을 기초로 한 차량 소통 위주의 지표 외에 교통사고 감소율로써 교통안전도 개선 지표로 활용할 수 있음을 알 수 있었다. 해당 결과값 은 실제 교통사고 발생 건수가 아닌 차량 상충을 예측한 값이므로 교통안전도 개선 지표로 활용하기 위해서는 추후 실제 교통사고 발생건수를 비교한 정산을 통해 결과의 신뢰성 확보가 필요하며, 교통사고 발생의 여러 요인들에 의한 연계성을 병행한 분석을 통 해 보완하면 보다 객관적인 교통안전도 개선 지표를 수립할 수 있을 것으로 기대된다.

패밀리 레스토랑 브랜드 아이덴티티가 소비자의 구매의도에 미치는 영향

박정훈 ( Jung Hun Park ),김지응 ( Ji Eung Kim ) 한국식생활문화학회 2009 韓國食生活文化學會誌 Vol.24 No.3

As multinational brands have made inroads into domestic food service industry, and its recognition has been high to consumers, This research has tried to examine the general identity of brand, their recognition, and re-purchase behaviors. The purpose of this study is to inquire into how the brand value by brand identity was caused by recent development of food service industry, and how it had an effect on the purchase behaviors of them. In particular, factors of general identity have a significant effect on the revisit and purchase intention, as the image and ads of family restaurant among brand property factors of family restaurant showed an significant effect on the revisit intention. This study was made with priority given to the brand identity as four brand factors such as product brand, organizational brand, community brand and design brand based on the confidence. Results found that the community brand and design brand had a significant difference on purchase intention. Consequently, it has been suggested that the marketing strategies to make the brand identity strong have to be established with various brand enhancement tactics in the food service industry.

한국 근로자에서의 물리적 인자 및 근무여건과 직업성 손상 간의 관련성

박정훈 ( Jung Hun Park ),성주현 ( Joo Hyun Sung ),심창선 ( Chang Sun Sim ),이찬부 ( Chan Boo Lee ),박상진 ( Sang Jin Park ),이지호 ( Ji Ho Lee ),이충렬 ( Choong Ryeol Lee ) 한국산업보건학회 2015 한국산업보건학회지 Vol.25 No.3

Objectives: The aim of this study is to evaluate the association between physical factors, working conditions and occupational injuries among Korean workers. Methods: We used data from the 2nd Korean Working Conditions Survey, conducted in 2010. A total of 7,114 workers over 15 years of age were selected from among 10,019 Korean workers. The participants were interviewed using questionnaires. A multiple logistic regression model was used to analyze the associations among physical factors, working conditions and occupational injuries. Results: After the adjustment of socio-demographic factors, the odds ratio of injuries through physical factors such as vibration (adjusted Odds Ratio [aOR] 4.037, 95% CI 2.30-7.09), noise (aOR 4.562, 95% CI 2.64-7.89), high temperature (aOR 3.262, 95% CI 1.86-5.73), and low temperature (aOR 3.358, 95% CI 1.76-6.41) were greater in the exposed group than in the non-exposed group. The odds ratios of occupational injury(aOR 5.272, 95% CI 3.19-8.7 for very high speed work, aOR 3.303, 95% CI 1.95-5.60 for tight deadlines, and aOR 3.641, 95% CI 1.72-7.70 for not enough time to work) increased with increased work demands. Conclusions: In this study, physical factors such as vibration, noise, and high and low temperatures were significantly correlated with occupational injuries according to the increase in exposure intensity(p for trend <0.001). Also, working conditions such as high-speed work, tight deadlines and insufficient time to work showed significant associations with occupational injuries(p for trend<0.001).

A 4.4-8.1㎓, 1.76㎽ Low-Power and Low-Phase-Noise Ring Oscillator

Jung-Hun Park(박정훈),Deog-Kyoon Jeong(정덕균) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8

DNA감정체계 개선을 통한 증거능력 확보방안

박정훈 ( Jung Hun Park ) 안암법학회 2013 안암 법학 Vol.0 No.41

DNA evidence, which can be considered the most important method of scientific evidence, is essential to solving various crimes and accidents, including sexual crimes. Also, evidence obtained from DNA examination provides the most effective and admissible evidence compared to all other types of scientific evidence. Although it has been over 20 years since Korea has started conducting DNA examinations, our country lacks the standard scientific procedures, methods, and standards of DNA examinations. And Organizations that conduct examinations must also have a serious discussion on ``Chain of Custody``, which states that DNA evidence must be collected, stored, transported, and examined without contamination or damage and must preserve its ``ntegrity`` Also, each organization has different criteria and certifications necessary for selecting its DNA examiners. Furthermore, Korea doesn`t have a systematic education program to train DNA examiners. Even if DNA examiners obtain results following scientific procedures and methods, if one considers that the examination and results are conducted and analyzed by the examiner then it will be made clear that implementing a systematic education and evaluation of DNA examiners is an urgent matter. Also, since most organizations that conduct examinations are directly or indirectly related to investigative organizations, objectivity issues can be considered a potential problem. This is why organizations that conduct examinations must be independent from investigative organizations and conduct examinations objectively.