가평지역 잣나무 풍매차대검정림 (風媒次代儉定林)의 가계별 (家系別) 생장과 생리적 특성에 관한 연구

정동준(Dong Jun Chung),신만용(Man Yong Shin),장용석(Yong Seok Chang),전상근(Sang Keun Chon) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.1

This study was conducted to reveal the relationship between physiological characteristics and growth by family for open-pollinated progeny stand of Korean white pine in Gapyung site. Average growth performance of total 25 families for 18 years old progeny stand in this study site showed 5.9m in mean height, 8.9㎝ in mean DBH, 12.0㎡ in basal area per hectare and 46.5㎥ in volume per hectare, respectively. By the analysis result of growth performance for all 25 families, family No. 20 showed the most excellent growth and middle in family No. 10. On the other hand, family No. 3 represented the worst growth among the 25 families. The change of seasonal photosynthesis rate by increasing luminous intensity was the same tendency as the growth pattern of all 25 families and showed the same results in all four seasons. In the seasonal analysis, the photosynthesis rate was increased as the season has changed from winter to summer. Chlorophyll contents was also increased from winter to summer. Especially, family No. 20 which is the best in growth performance has more chlorophyll contents than the others. In addition, family No. 20 was also better than other families in the weight of assimilation tissue(g), length of needle(㎝), width of needle(㎝), and number of Stoma. However, in water utilization rate, family No. 3 which is the worst in the growth performance showed the best result that is reverse tendency compared with the photosynthesis rate. The changes of water utilization rate represented to be increased as the season has changed from winter to summer.

북한예방의학회지 ($1997{\sim}2006$) 게재논문의 핵심어 네트워크 분석

정민수,정동준,최만규,Jung, Min-Soo,Chung, Dong-Jun,Choi, Man-Kyu 대한예방의학회 2008 예방의학회지 Vol.41 No.6

Objectives : There are very few researches on North Korea's academic activities. Furthermore, it is doubtful that the available data are reliable. This study investigated research activities and knowledge structure in the field of Preventive Medicine in North Korea with a network analysis using co-authors and keywords. Methods : The data was composed of the North Korean Journal of preventive medicine ranged from Vol. 1 of 1997 to Vol. 4 of 2006. It was the matrix of 1,172 articles by 1,567 co-authors. We applied R procedure for keywords abstraction, and then sought for the outcome of network forms by spring-KK and shrinking network. Results : To comprehend the whole networks explicitly demonstrated that the academic activities in North Korea s preventive medicine were predisposed to centralization as similar as South Korea's, but on the other aspect they were prone to one-off intermittent segmentation. The principal co-author networks were formulated around some outstanding medical universities seemingly in addition to possible intervention by major researchers. The knowledge structure of network was based on experimentation judging from keywords such as drug, immunity, virus detection, infection, bacteria, anti-inflammation, etc. Conclusions : Though North Korea is a socialist regime, there were network of academic activities, which were deemed the existence of inducive mechanism affordable for free research. Article keywords has laid greater emphasis on experiment-based bacterial defection, sustainable immune system and prevention of infection. The kind of trend was a consistent characteristic in preventive medicine of North Korea haying close correlation with Koryo medical science.

국내 예방의학 분야의 공저자.핵심어 네트워크와 군집 양상 - 대한예방의학회지($1991{\sim}2006$) 게재논문의 분석 -

정민수,정동준,Jung, Min-Soo,Chung, Dong-Jun 대한예방의학회 2008 예방의학회지 Vol.41 No.1

Objectives : This study evaluated knowledge structure and its effect factor by analysis of co-author and keyword networks in Korea's preventive medicine sector. Methods : The data was extracted from 873 papers listed in the Journal of Preventive Medicine and Public Health, and was transformed into a co-author and keyword matrix where the existence of a 'link' was judged by impact factors calculated by the weight value of the role and rate of author participation. Research achievement was dependent upon the author's status and networking index, as analyzed by neighborhood degree, multidimensional scaling, correspondence analysis, and multiple regression. Results : Co-author networks developed as randomness network in the center of a few high-productivity researchers. In particular, closeness centrality was more developed than degree centrality. Also, power law distribution was discovered in impact factor and research productivity by college affiliation. In multiple regression, the effect of the author's role was significant in both the impact factor calculated by the participatory rate and the number of listed articles. However, the number of listed articles varied by sex. Conclusions : This study shows that the small world phenomenon exists in co-author and keyword networks in a journal, as in citation networks. However, the differentiation of knowledge structure in the field of preventive medicine was relatively restricted by specialization.

국내 보건학 분야 학술활동의 군집화와 “두 문화”현상 -보건행정학회지(1991∼2006) 게재논문의 공저자 네트워크 분석-

정민수 ( Min Soo Jung ),정동준 ( Dong Jun Chung ) 한국보건행정학회 2008 보건행정학회지 Vol.18 No.2

This research analyzed knowledge structure and its effect factor by analysis of co-author and keyword network in Korea`s health policy and administrattion sector. The data was extracted from 339 articles listed in the Korean Journal of Health Policy and Administration, and was transformed into a co-author and keyword matrix. In this matrix the existence of a link was defined by impact factors which were calculated by the weight value of what the role was and the rate of how many authors contributed. We demonstrated that the research achievement was dependent on the author`s status and network index. Analysis methods were neighborhood degree, correspondence analysis, multiple regression and the difference of weight distribution by research fields. Co-author networks were developed as closeness centrality as well as degree centrality by a few high productivity researchers. In particular, power law distribution was discovered in impact factor and research productivity. The effect of the author`s role was significant in both the impact factor calculated by the participatory rate and the number of listed articles. Especially, this journal shared its major researchers who had a licensed physician with the Journal of Preventive Medicine and Public Health. Therefore, social scientists were likely to be small co-author network differently from natural scientists. It was so called ``two cultures`` phenomenon. This study showed how can we verified academic research structure existed in the unit of journal like as citation networks. The co-author networks in the field of health policy and administration had more differentiated and clustered than preventive medicine and epidemiology fields.

고속도로변 산림지역(신갈, 서천) 강우의 화학적 조성

김영채 ( Young Chai Kim ),정동준 ( Dong Jun Chung ),김홍률 ( Hong Ryul Kim ) 한국농림기상학회 2002 한국농림기상학회지 Vol.4 No.4

Air pollution by acid pollutants is problematic in the whole world. Water acidification has already been deteriorating the forest ecosystem. This study was conducted to analyze the acidity and chemical composition of the open precipitation and throughfall at forests with various geographic locations in Korea. The results of this study are as follows; The open precipitation pH was lowest in Seochun. The throughfall pH showed some buffering capacity in only Quercus mongolica stands. In Pinus rigida(Shingal and Seochun) stands, there was little difference from the open precipitation. Chemical composition of the open precipitation for each sampling site showed that Ca^2+, NH^+_4 and SO^2-_4 concentrations had higher value than other ions, and except these ions, the small quantity of ions showed different properties to each site. Changes of ion concentrations in the throughfall showed a tendency to increase. Ion concentrations of the throughfall increased with washout and nutrient leaching from the trees. In conclusion, the influence was extended to the pure zone, and the frequency of acid rain is increasing. But, if the deposition of pollutants exceeds the capacity of purification, it would damage forest ecosystem. Further investigations are necessary to identify tolerant tree species to acid pollutants.

대학교육에 있어서의 산학협동모형 개발에 관한 연구

김충기,길형석,김진순,정동준,정재철,이재기,Kim, Chung-Gi,Gil, Hyeong-Seok,Kim, Jin-Sun,Jeong, Dong-Jun,Jeong, Jae-Cheol,Lee, Jae-Gi 한국대학교육협의회 1988 大學敎育 Vol.31 No.-

강원도 평창지역의 산림내 강설 산성도와 화학적 조성 - 대관령과 운교리를 중심으로 -

김영채(Young Chai Kim),정동준(Dong Jun Chung),김홍률(Hong Ryul Kim) 한국농림기상학회 2001 한국농림기상학회지 Vol.3 No.3

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잣나무 유령임분의 최적 경쟁지수의 선발

신만용(Man Yong Shin),정동준(Dong Jun Chung),김재헌(Jae Heun Kim) 한국산림과학회 2002 한국산림과학회지 Vol.91 No.1

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토양산도가 무궁화의 생장 및 화색에 미치는 영향

조윤진(Yoon-Jin Cho),박형순(Hyung-Soon Park),정현관(Hun-Gwan Chung),김세현(Sea-Hyun Kim),정동준(Dong-Jun Chung),한진규(Jin-Gyu Han) 한국자원식물학회 2006 한국자원식물학회지 Vol.19 No.1

본 연구는 나라꽃 무궁화의 아름다움을 나타내는 화색에 미치는 요인 중 토양산도와 무궁화의 화색특성과 생장과의 관계를 조사 연구함으로써 가장 이상적인 색깔을 갖추는 pH 범위를 파악하여 무궁화 화색육종 계획의 기초를 마련하고자 하였다. 토양산도별 생육특성을 조사하고 분석한 결과 홍화랑과 영광 품종은 pH 7에서 엽수가 183.73개와 135.87개로 가장 높게 나타났으며 pH가 증가함에 따라 증가하였다. 토양산도별 4품종의 화색변화를 조사하고 분석한 결과 홍화랑 품종은 pH가 높아짐에 따라 L값은 17.05~12.26로 점점 낮아졌으며 a값은 16.37~20.91로 점점 높게 나타났다. This is a study on relationship between soil pH and flower color and growth of Hibiscus siriacus L, looking for the pH range to result the most ideal flower color. I anticipate this study result will lay a foundation of improved breeding plan of Hibiscus siriacus L. According to the result of investigation and analysis on bleeding peculiarities by each soil pH, the numbers of leaves in Honghwarang and Younggwang reached the highest at pH 7: 188.73 and 135.87 respectively. Increased pH resulted the increased number of leaves. According to the result of investigation and analysis on color changes of four kinds of Hibiscus siriacus L. at various pH level, Honghwarang s L value gradually decreased from 17.05 to 12.26 at pH increase while a value increased from 16.37 to 20.91.

지역별 잣나무의 초기생장 특성과 미기후의 영향 - 정기평균생장량과 미기후와의 관계 -

전상근(Sang Keun Chon),신만용(Man Yong Shin),정동준(Dong Jun Chung),장용석(Yong Seok Jang),김명수(Myung Soo Kim) 한국산림과학회 1999 한국산림과학회지 Vol.88 No.1

This study was conducted to reveal the characteristics of the early growth by locality for Korean white pine planted in Gapyung and Kwangju, Kyunggi-Do and Youngdong, Choongchungbuk-Do. The effects of local climatic conditions as one of environmental factors on the growth were also analyzed. For this, several stand variables such as number of trees survived, mean DBH, mean height, basal area per hectare, and volume per hectare by stand age were measured and summarized for each locality. Based on these statistics, periodic annual increments for 8 years from stand age 10 to 18 were calculated for each of stand variables. A topoclimatological technique, for the estimation of local climatic conditions, which makes use of empirical relationships between the topography and the weather in study areas was applied to produce reasonable estimates of monthly mean, maximum, minimum temperatures, relative humidity, precipitation, and hours of sunshine over remote land area where routine observations are rare. From these monthly estimates, 17 weather variables such as warmth index, coldness index, index of aridity etc. which affect the tree growth, were computed for each locality. The periodic annual increments were then correlated with and regressed on the weather variables to examine effects of local weather conditions on the growth. Gapyung area provided the best conditions for the growth of Korean white pine in the early stage and Kwangju area ranked second. On the other hand, the growth pattern in Youngdong ranked last overall as expected. It is also found that the local growth patterns of Korean white pine in juvenile stage were affected by typical weather conditions. The conditions such as low temperature, high relative humidity, and large amount of precipitation provide favorable environment for the growth of Korean white pine. Especially, the diameter growth, basal area growth, and volume growth are mainly influenced by the amount of precipitation. However, it is proved that the height growth is affected by both the precipitation and temperature.