배구 선수들의 시합 전·후의 운동수행 특성과 혈중지질의 비교

정구열(Gu-Yeol Jeong),정홍용(Hong-Yong Jung),김재필(Jae-Pil Kim) 한국발육발달학회 2021 한국발육발달학회지 Vol.29 No.3

The purpose of this study is to analyze exercise performance characteristics and blood lipids changes before and after the game in volleyball players in order to suggest basic information about players’ physiological changes and provide and design more effective and scientific training methods. The participants of this study were 15 volleyball players of G University located in Gyeongsangnam-do and of C University located in Gwangju Metropolitan City. Their blood and exercise performance characteristics were analyzed before and after the game. Blood component changes were measured by the paired t-test analysis and the relationship between exercise performance ability and blood lipids were tested by correlation analysis. The level of statistical significance was set at p<.05. Finally, the following conclusions were drawn. First, volleyball playes’s blood lipids changes were analyzed before and after the game. There was a statistically significant decrease in TC(t=3.884, p<.01) and TRG(t=4.273, p<.01) before and after the game. Moreover, there was a statistically significant decrease in Non-HDL(t=3.291, p<.01) and GLU(t=1.847, p<.05) before and after the game. Second, correlation analysis was done to examine the relationship between exercise performance characteristics and blood lipids in volleyball players’ game. As a result, it was found that TC, LDL, and Non-HDL after the game were significantly negative correlation with mean heart rate, mean values of exercise intensity, and calorie consumption(p<.01). In conclusion, volleyball players need high level aerobic exercises for blood lipids changes and plyometric training, interval training, and core balance exercise to build up maximum muscle strength for short period to improve performance levels through exercise performance. It is, therefore, necessary to develop scientific and effective programs for volleyball players.

수술용 결찰 클립의 강성인자 해석

정구한(G. H. Jeong),나종서(J. S. Na),이시우(S. W. Lee),이상욱(S. W. Lee) Korean Society for Precision Engineering 2023 한국정밀공학회 학술발표대회 논문집 Vol.2023 No.11

러프집합을 이용한 정보시스템에서의 불완전 데이터 처리에 관한 연구

정구범(Gu-Beom Jeong),정환묵(Hwan-Mook Chung) 한국지능시스템학회 1999 한국지능시스템학회논문지 Vol.9 No.3

R&D 프로세스 수행 정도와 의지가 기업 성과에 미치는 영향

정구진 ( Kujhin Jeong ),김지은 ( Jeeeun Kim ),이성주 ( Sungjoo Lee ) 한국생산성학회 2017 生産性論集 Vol.31 No.3

R&D becomes a critical success factor in the development of science and technology, as well as sustainable innovation in business and national economies. To dominate the fast-changing and increasingly competitive global market, firms should be able to accurately reflect customer`s demands and deliver suitable products as soon as possible. However, success of R&D is low-probability precess because of R&D`s own characteristics and numerous environmental factors. There have been many efforts to study R&D success rate in various aspects. One of them is an approach to R&D process management. The importance of the R&D process has been verified by major studies. Nevertheless, few efforts have been made to standardize and categorize R&D processes. This paper aims to define the standard R&D process and identify the effect of performance of R&D process on firm`s performance. For the purpose, first, we made seven hypothesis about the relationship between R&D process and firm`s performance. Second, we defined R&D activities are classified into four levels (organizational, project-support, product execution and technology execution) and consist of a total of 25 activities based on the Stage-gate model of Cooper (1986). Third, we carried out a survey on R&D process of IT firms and collected data about their status of R&D process performance. We asked the respondents three questions about the R&D process: the goal level for the R&D process (the expected level of process performance), the performance (the degree of actual performance for the process) and improvement efforts (The efforts made for the last three years for the process thought to be needed to improve). Then we analysed the data using a partial least squares model and tried to investigate the relationships between R&D process performance and their performance. Finally, we discussed findings and contributions of this paper. This study is very valuable in the point that it suggests more detailed R&D process comparing with existing R&D process researches and derives influence relationship between R&D process and its performance based on actual data obtained through questionnaires. In addition, the results of this study can be used as a basis for decision-making when firms and government set up R&D process strategy. From the perspective of the firm, the results of this study can be used as a suggestion for making a decision for `achieving something in a short period with limited resources.` Firms will be able to concentrate their resources on the product development process and the organizational process based on the research result that shows the organizational process and product development process have a greater impact on R&D performance than the support process and technology development process. Also, from the viewpoint of the government, the results of this study can provide the most effective support direction to support the R&D process of companies. The R&D improvement effort has a great impact on R&D performance considering the R&D target level or performance. This means that the improvement efforts on R&D performance are an important factor in raising the success rate of R&D. Therefore, the government can have policies that can make people recognize the importance of R&D for companies, in addition to the support of funding and human resources.

보고 : 연구소 소개 ; 삼성 디자인넷

정구창 ( Jeong Gu Chang ) 한국의류산업학회 2002 한국의류산업학회지 Vol.4 No.5

독립형 태양광 인버터의 병렬 운전 기법

정구인(Jeong Ku-In),권정민(Kwon Jung-Min) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.6

In this paper, a parallel operating technique for the stand alone photovoltaic (PV) power conditioning system (PCS) is proposed. The proposed parallel operating technique can increase the power rating of the system easily. Also, it provide three-phase connection function. The proposed technique does not separated master and slave system. Also, it does not use the separated synchronization line. Therefore, the PCS can supply continuous power even if one of the PCS breaks down. This technique is composed of a phase locked loop (PLL) control, droop control, current limit control and etc. Experimental result obtained on 2-kW prototype to verify the proposed technique.

대학 신입생의 학문적·사회적 통합성과 자기회의가 자살생각에 미치는 영향

정구철(Goo Churl Jeong),신성례(Sung Rae Shin) 한국보건교육건강증진학회 2011 보건교육건강증진학회지 Vol.28 No.5

"특집 1 : 반계 유형원과 동아시아 초기 실학 : (기조강연) 반계 유형원의 학문세계와 그 영향"

정구복 ( Jeong Gubok ) 한국실학학회 2017 한국실학연구 Vol.0 No.34

이 글은 한국 실학의 창시자인 반계 유형원(1622~1673)의 학문적 성격을 주로 살펴본 것이다. 그의 학문은 대단히 광범위 하였고 그 저서가 70여 책으로 알려지고 있으나 그의 저서 중 현전하는 책에는 두 가지뿐이다. 하나는 그가 45세 때에 쓴 『동국여지지』로서 이는 우리나라 전국의 군현에 대한 인문지리학적저술(9권)이고 다른 한 책은 31세 때부터 쓰기 시작하여 49세 때에 완성한 국가통치제도론인 『반계수록』 26권이다. 이들 현전하는 두 책을 통해 그의 학문적 관심, 성향, 그리고 그 중심 논리를 추론해 보았다. 이 두 책은 다룬 내용은 크게 다르나 상호 밀접한 관계를 가지는 저술이다. 『동국여지지』는 『반계수록』이란 저서를 쓰기 위한 자료를 정리한 것이라고 할 수 있다. 『동국여지지』는 조선 후기에 큰 학문경향을 띈 역사지리학 발전에 중심적 역할을 하였다. 이 책에서 그가 전국의 지리와 국토, 역사를 사랑하고 존중했음을 확인할 수 있다. 이에서 그가 추구하는 것은 문학적 표현보다 사실적 기록을 존중하는 학문성향을 파악할 수 있다. 또한 전국의 지리지를 자신의 저술로 주장하지도 않아 역사지리학의 공적 개념을 보여준 것이라 할 수 있다. 이는 자신이 찬자임을 명시하지 않았고 내용을 후대 사람들로 하여금 보완하도록 한 조처가 이를 말해준다. 『반계수록』은 그가 20년에 걸쳐 완성한 국가개혁안이었다. 이는 국가경영학이란 학문 분야를 새롭게 개척한 것이다. 그의 국가 통치제도 개혁론의 근본 정신은 “모든 사람이 자기 몫을 차지할 수 있어야 한다”는 것이었다. 그 근본 정신을 고대의 『주례』에서 찾았지만 그렇다고 그가 고대사회로 복귀하자는 것은 아니었다. 그의 개혁안은 사욕(私慾)이 배제되고 천리(天理)가 구현된 통치제도를 마련하는 것이었다. 천리는 당시의 철학인 성리철학에서 가장 중시한 핵심 개념이었다. 성리학이 자기 수양을 위해서 강조하던 천리의 실현을 개인차원에서 사회적으로 실현할 수 있는 영역으로 확대시켜 끌어 올린 것이다. 그의 학문적 영향은 그가 장기간 살았던 지역 전라도 지역의 후배학자들에게 준 영향과 그의 묘소가 있는 경기도 용인시를 중심으로 하는 서울 경기지역의 학자에게 준 영향으로 구분해 살펴볼 수 있다. 전라도지역에서는 그의 학문보다 행실과 인품을 사모하여 서원을 세워 매년 제사를 올렸으니 부안의 동림서원이 그의 사후 20년만에 세워졌고, 그의 역사지리학은 전라도 순창에 살았던 신경준(1712-1781)에게 큰 영향을 주었고, 개화기까지 이지방 학자들에게 큰 영향을 미쳤다. 경기도 서울 권의 영향은 그의 국가경영학이 성호 이익(1681-1763), 다산 정약용(1762-1836)에 의해 계승 발전하였고, 안정복(1712-1791), 홍계희(1703-1771) 등에게 큰 학문적 영향을 주었다. 그의 저술 『반계수록』은 조선시대 당파에 구애되지 않고 모두 칭찬되었고, 영조 46년 1770년에 경상도 감영에서 목판으로 출간되어 조선시대의 준 법전으로 인정되었다. This article examined the academic achievements of Bangye Yu Hyeongwon (1622~1673). He authored about 70 books but only two books are extant. One is 『Donggukyeojiji(東國輿地志)』 in 9 volumes and the other is 『Bangyesurok(磻溪隧錄)』 in 26 volumes. He wrote the former at the age of 45 describing the human geography of Joseon and the latter from the age of 31 to 49 discussing the ruling system of it. From the two extant books, his academic interests, disposition and the central logic can be inferred. The contents of the two books are different but closely related. 『Donggukyeojiji』 was the result of organized data to write 『Bangyesurok』. 『Donggukyeojiji』 played the central role in the development of historical geography of late Joseon period. From the book, his love and respect for the land and history of Joseon can be identified. He used realistic descriptions rather than literary expressions. He did not claim himself as an author of the book. Instead, he took geography as a public subject and allowed the contents to be supplemented by the future generations. That reveals the public concept of historical geography. 『Bangyesurok』 was a national reformation plan completed in 20 years. An academic discipline of national management was pioneered. His reformation principle of a ruling system was 'Everyone should have his own share.' He claimed the principle originated from 『Jurye 周禮』 but didn't mean to return to the ancient society. His reformation plan was to build a ruling system following natural law (天理) without selfish interests. Natural law was the core concept of Neo- Confucianism at that time. Neo-Confucianism emphasized natural law for self-discipline and the concept was expanded from the individual dimension to the social one. His academic influence has succeeded in Jeollado province where he lived for a long time and in Seoul and Gyeonggi province, centering Yongin where his tomb exists. In Buan, Jeollado, Dongrim Seowon memorial hall was constructed in the 20th year after his death to cherish his behavior and character rather than his academic achievements and has held an annual memorial rite. His historical geography influenced Shin Gyeongjun(1712-1781) in Sunchang, Jeollado and other local scholars until the end of the 19th century. In Gyeonggido province and Seoul, his national management succeeded to Seongho I Ik(1681-1763) and Dasan Jeong Yakyong(1762-1836) and influenced An Jeongbok(1712-1791) and Hong Gyehui(1703-1771) greatly. 『Bangyesurok』 was praised regardless of factions and published in wood block printing in 1770 (Yeongjo the 46th year) by the Gyeongsang provincial office. It was recognized as a quasi-law book in Joseon period.

유비쿼터스 네트워크에서 모듈형 모바일 로봇과 위치 인식 시스템을 위한 사례

정구철 ( Goo Cheol Jeong ) 한국실천공학교육학회 2012 실천공학교육논문지 Vol.4 No.2

위턱굴 점막(Schneiderion membrane)의 조직형태계측학적 특성

정구수 ( Goo Soo Jeong ),이건웅 ( Geon Woong Lee ),김성훈 ( Seong Hoon Kim ),전현상 ( Hyun Sang Jeon ),국중기 ( Joong Ki Kook ),김흥중 ( Heung Joong Kim ) 조선대학교 치의학연구원 2010 Oral Biology Research (Oral Biol Res) Vol.34 No.2

For dental implant placement on maxilla, both the shape of maxillary sinus and characteristic of sinus membrane are important. Particularly, the sinus graft surgery needs the accurate understanding of maxillary sinus mucosa (Schneiderian membrane). Therefore, the purpose of this study is to investigate the thickness and histologic characteristics of the maxillary sinus mucosa. Six cadaver heads (12 maxillary sinuses) were examined (4 male and 2 female, average age; 55.8 years). The specimens were decalcified with EDTA, embedded with the paraffin and microsectioned to 5㎛ thickness. The sections were stained hematoxylineosin (H&E) and observed by the light microscope (Carl Zeiss, GER). The thickness of sinus membrane measured by the Axiovision LE release 4.6 (Carl Zeiss, GER). The mean thickness of the maxillary sinus mucosa was 369±82.03㎛, and the mean thickness of the nasal cavity mucosa was 881±67.12㎛. The maxillary sinus mucosa was a continuation of the nasal cavity mucosa, its epithelium consisted of pseudostratified ciliated columnar epithelium and the goblet cells were located among the columnar epithelium. The lamina propria of the maxillary sinus mucosa was thinner than the nasal cavity mucosa, which also had relatively fewer glands and vascular distribution. The bony wall of the maxillary sinus adjacent the sinus mucous membrane was mostly continuous, but was scarcely perforated by neurovascular channels. For the sinus graft surgery, it is crucial to understand the anatomic knowledge of the membrane thickness as well as glands distribution and vascular distribution of the maxillary sinus.