덕동호와 보문호의 식물플랑크톤에 대한 계절적 변화

김용재,김한순,정준 ( Yong Jae Kim,Han Soon Kim,Jun Chung ) 한국하천호수학회 1991 생태와 환경 Vol.24 No.4

The purpose of this study was to investigate the phytoplankton composition and agal biomass from Tokdong and Pomun lakes in Kyongju city, from May,1989 to April,1990. The authors have examined 139 taxa of the phytoplankton from Tokdong and Pomun lakes. These were composed of 5 classes, 10 orders, 3 suborders, 23 families, 50 genera, 110 species, 25 varieties and 4 forma. Agal biomass increased from 27 individuals/ml in January to 140 individuals/ml in November, at Tokdong lake and from 19 individuals/ml in January to 538 individuals/ml in August, at Pomun lake. Two peaks of chlorophyll-a concentration were observed in the surface water of both lakes, one in September and the other in February. Annual mean concentrations of chlorophyII-a were 4.6㎍/1 and 9.9㎍/1 in the surface water of Tokdong and Pomun lakes. Trophic states of both lakes were intermediate levels between oligotrohic and mesotrophic at Tokdong lake, and between mesotrophic and eutrophic at Pomun lake as the quantity of chlorophyll-a

임하호의 식물 플랑크톤 군집구조

김용재,최재신,김한순 ( Yong Jae Kim,Jae Shin Choi,Han Soon Kim ) 한국하천호수학회 1997 생태와 환경 Vol.30 No.4

Phytoplankton communities are investigated at four stations in Lake Imha from March, 1992 to November, 1994. Phytopalnkton are identified from 234 taxa in 1992 to 302 taxa, in 1994. Standing crops are the highest value in 1992 and the lowest value in 1993, and slowerly increased in 1994. Dominant species are Cyclotella pseostelligera and 13 taxa. Among them, Anabaena solitaria f. planctonica is bloomed during the season the high Total-N/Total-P ratio. This result is guessed the difference between the water environment of Korea and other nations.

「천변풍경」의 담론 특성 연구

김용재(Kim Yong-jae) 국어문학회 2007 국어문학 Vol.42 No.-

The purpose of this study was to make it clear the feature of discourse in The Landscape along the Riverside(Cheonbyeon-Punggyeong). This work described a landscape of the riverside for a year of 19308 and shaped more than thirty persons under orderly plot and properly controled narration. Characters were divided into three: the 1st group was like clerical staff Min and the owner of a linen shop, representing the middle class; the 2nd group, women centering Jeom-ryong's mother; the 3rd group, the humble class who had come to Seoul like Jae-bong and Chang-soo. These groups of persons were in the foreground to the readers through alternating between focalizer and narrator. The story connected with the mood of the seasons, didn't generally approach of modem reality, and focused on revealing the dailiness of the persons and the aspect of the community life. Thus, the change of time was analyzed into repetition and circulation. The narrator showed the 1st group denial and caricature, the 2nd the warmhearted and objective attitude, and the 3rd affirmation and expectation, focusing on the humble class's community life in the modem times. Especially, Jae-bong and Chang-soo played essential parts. This novel centered on embodying speciality through the equipment such as rumor, observation and peep while weakening narrativity. In addition, inserting the discourses to induce readers contributed to the story connection and the embodiment of space. Cheong-kye riversides community's city life was described through the method of daily discourses. This dailiness was a way of experience in the modern times and reflection of the prevailing society. It could not be disregarded that the feature of discourse enlarged the spaciality through the structure of circulation and repetition.

임하호에서의 (臨河湖) 식물성플랑크톤 군집의 (群集) 생태학적 고찰

김용재,최재신,김도한,정준 ( Yong Jae Kim,Jae Sin Choi,Do Han Kim,Jung Chung ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.1

This study was investigated the ecological study of phytoplankton community from eight stations of Imha lake on May, July, September and November in 1993. Phytoplankton was identified the total 297 taxa, which was composed of 261 species, 29 varieties, 3 forma and 4 unidentified taxa. Standing crops were ranged from 6.Ox10^5unit/l at st. 1 on May to 1.4×10^7unit/l at st. 2 on July. Dominant species were Anabaena soilitaria f. planctonica, Cyclotella comta, Cyclotella meneghiniana, Cyclotella ocellata, Cyclotella stelligera and Synedra delicatissima var. angustissima. Dominant index, diversity index and evenness index were 0.068∼0.750, 0.341∼1.367, 0.183∼0.716, respectively. In relationships between community and physico-chemical factors, chlorophyll-a concentration was showed a law coefficient with the total standing crops but a high with standing crop of C. stelligera. Water temperature was a positive relations with the total standing crops. T-P was showed a low relation with the total standing crops and a negative with A. solitaria f. planctonica. T-N and conductivity were a positive with the total standing crops and standing crop of Bacillariophyceae. This lake was the oligotrophic or mesotrophic type on May but converted from mesotrophic to eutrophic type at all stations on July, September and November by comparison with phytoplankton community and physico-chemical factors.

차원해석을 이용한 사용후 핵연료 수송용기의 충격력 실험식 공식화

김용재,최영진,이영신,Kim Yong-Jae,Choi Young-Jin,Lee Young-Shin 한국전산구조공학회 2005 한국전산구조공학회논문집 Vol.18 No.3

방사성물질은 다양한 분야에서 사용되고 있으며 이에 따른 국내 및 국제간 운반이 계속적으로 증가하고 있다. 방사성물질을 수송하기 위해서는 수송용기의 안전성이 확보되어야 한다. 방사성물질 수송용기의 안전규정에 관해서는 국내 원자력법 운반안전규정 및 IAEA 운반규정에서 규정하고 있다. 방사성물질 수송용기 중에서 사용후핵연료를 운반하는 수송용기는 본체와 충격완충제로 구성되어 있다. 본 논문에서는 사용후핵연료 수송용기의 충격완충제에 작용하는 충격력을 계산하는 간편한 실험식을 차원해석을 통하여 유도하였다. 해석결과는 기존의 충격면적법 및 유한요소해석과 비교를 통하여 그 타당성을 입증하였다. 본 실험식을 이용하여 수송용기의 낙하충격력을 쉽게 예측할 수 있다. Radioactive material is used in the various fields. The numbers of transport for radioactive material have been gradually increased in both domestic and International regions. The safety of the cask should be secured to safely transport of radioactive material. The korean atomic law and the IAEA safety standards prescribe regulations lot the safe transport of radioactive material The cask for spent fuel is comprised of the body and the impact limiter. In this study, the empirical equation of the cask impact force is proposed based on the dimensional analysis. Using this empirical equation the characteristics of the impact limiter are analyzed. The results are also validated by comparing with the previous results of the impact area method and the finite element analysis. The present method can be used to predict the impact force of the cask.

전기자 분산배치 PMLSM의 단부 코깅력 저감을 위한 전기자 스큐각의 영향 분석

김용재,김재홍,Kim, Yong-Jae,Kim, Jae-Hong 한국전자통신학회 2014 한국전자통신학회 논문지 Vol.9 No.2

영구자석 선형 동기 전동기는 회전기기에 비해 구조적으로 간단하여 보수 점검이 용이하고 정밀, 고속, 고추력화 등의 많은 장점을 가지고 있다. 하지만 반송경로 전장에 전기자를 설치해야 하는 구조적 특성으로 인해 반송경로가 길어지면 길어질수록 초기 설치비용이 상승하게 된다. 이러한 문제점을 해결하기 위해 전기자를 분산시켜 배치하는 방식을 제시하였으나 전기자를 분산시켜 배치할 경우 전기자 양 끝단에는 구조상 반드시 단부가 존재하게 되며 이러한 단부는 추력 맥동을 야기하는 코깅력을 크게 발생시켜 기기의 소음과 진동 및 기기의 성능 저하의 원인이 된다. 따라서 본 연구에서는 기기의 운전특성을 향상시키기 위해 전기자의 스큐에 따른 단부특성을 3D FEM 수치해석을 이용하여 파악하고 단부 코깅력을 가장 저감시키는 전기자 스큐를 제안하고자 한다. The permanent magnet linear synchronous motors facilitate maintenance, for it is structurally simple compare to rotating machine and has lots of advantage such as a precision control, high speed, high thrust and so on. However, it causes an increase of material cost because of structural characteristics that need to arranges the armature on the full length of transportation lines. Thus, in order to resolve this problem, we propose the discontinuous arrangement method of the armature but the edge always exists due to the structure when the armature is arranged discontinuously. Due to this edge, the cogging force is greatly generated and it causes thrust force ripple generating noise, vibration and decline of performance. Therefore, in this paper, we examined the characteristic of end edge according to the skew angle through 3-D numerical analysis using finite element method(FEM) and improved the operation characteristics.

남부지방에서 벼 재배형태별 분얼체계 및 수량구성형질의 차이에 관한 연구 I. 묘종류와 육묘시기에 따른 묘소질 및 본답 생육의 변화

김용재,신해룡,장강연,Kim, Yong-Jae,Shin-Hae-Ryong,Chang, Gang-Yeon 한국작물학회 1992 한국작물학회지 Vol.37 No.3

To study the effects of different nursing methods and transplanting on the growth of the rice plant(Oriza sativa L.hn southern region of Korea, Kumo-byeo, Palgong-byeo and Dong-jinbyeo were transplanted from April 20 to July 20 with 15 days intervals as 8 days seedling (infant rice), 25 days box seedling for machine transplanting and 45 days conventional seedling, respectively. No. of leaves at transplanting were in order of 45 days seedling>25 days seedling>8 days seedling. In 25 days seedling, they were increased as transplanting dates were later from April 20 to June 5, and in 45 days seedling, it showed same tendency until June 5 with Dongjinbyeo, June 20 with Palgong-byeo and Kumo-byeo. Root activity according to the $\alpha$-naphthylamine oxidation activity and rooting activity were higher in order of 8 days seedling>25 days seedling>45days seedling. Panicle formation initiated after maximum tillering stage as transplanting at April 20 with 8 days seedling and 25 days seedling, but it intiated before maximum tillering stage as transplanting at July 20 in Kumo-byeo. and in Palgong-byeo intiations of panicle formation were shown after maximum tillering stage as transplanting until May 20, but June 5 in Dongjin-byeo. However, there was no significant tendency with 45 days seedling. Missing hill ratio were less than 5% as transplanting with 8 days seedling and 25 days seedlingregardless of transplanting periods or varieties.

보문호에서의 훈장말 속 ( 녹조강 ) 에 대한 계절적 변화

김용재,정준 ( Yong Jae Kim,Jun Chung ) 한국하천호수학회 1992 생태와 환경 Vol.25 No.4

This study compared the seasonal variations of the species composition and standing crops of the genus Pediastrum in the steady state and the nonsteady state of water environment in the Pomun Lake from November, 1990 to October, 1991. It was identified 15 taxa which were 8 species, 7 varieties in the genus Pediastrum from this lake. The variations of monthly taxa numbers were from 11 taxa in November, 1990 to 4 taxa in August, 1991. The variations of standing crops were from 7.5×10^4 unit/l in November, 1990 to 8×10^2 unit/l in August, 1991, respectively. It was a positive correlation between the standing crops and physico-chemical factors (e.g. pH, water temperature, transparency, NH_4- N, PO_4- P). Also, the chlorophyll-a concentration was closely correlated with the changes of standing crops. In the steady state of water environment, the regular seasonal variations were the autogenic changes by the self-activity of the genus Pediastrum, but in the nonsteady state, the irregular seasonalities were the allogenic changes by the external factors(e. g. influx of external polluted material, and vertical and horizontal mixing by a localized torriential downpour), and retarded the velocity and disturbed the courses of succession.

MgO의 전자선 증착율에 따른 PDP 방전 특성 분석

김용재,권상직,Kim, Yong-Jae,Kwon, Sang-Jik 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.8

The effects of the evaporation rate of MgO films using an electron beam on the MgO properties and the discharge characteristics of a plasma display panel (PDP) were investigated and analyzed. MgO films were deposited with the various MgO evaporation rates. The MgO properties such as the crystal orientation, the surface roughness, and the film structure were inspected using XRD (X-ray diffraction), AFM (atomic force microscopy). From the experiments and Paschen law, the maximum value of the secondary electron emission coefficient $({\gamma})$ was obtained at the evaporation rate of $5{\AA}/sec$. The XRD results and cathode-luminescence (CL) spectra show the ${\gamma}$ values are correlated with F/F+ centers of the molecular structure of MgO films. The minimum firing voltage and the maximum luminous efficiency were obtained at an evaporation rate of $5{\AA}/sec$. In the MgO film deposited at $5{\AA}/sec$, the (200) orientation and F+ center were most intensive.

漢文科 ‘논술형 문항’ 개발에 관한 小考

김용재Yong-jae, Kim) 성신여자대학교 교육문제연구소 2016 교육연구 Vol.67 No.-

이 글은 중등교육 ‘漢文’ 교과에서 다뤄질 수 있는 ‘論述形 問項 개발’ 에 초점을 맞추어 연구된 것이다. 현재 대부분의 일선 중등학교 현장교 육은 입시 위주의 교육에 편중된 나머지, 암기나 지식전달에 몰입되어 이뤄지고 있다. 이러한 학교현실과는 달리 우리나라의 각 대학에서 제시 하고 있는 입시 경향과 각종 정책에 따르면, 학습자의 종합적인 사고력과 이해력을 증진시킨다는 명분하에, ‘論述’을 또다른 평가유형으로 권장 하고 있는 실정이다. 그러나 敎育課程이 있으면 그에 부합하는 교육성취도 평가가 짝지어질 수 있듯이, 교수학습의 모형이 있어야만 그에 따른 교수학습 평가가 부합되는 것 또한 당연한 일이다. 그러나 학교 현장에 서의 교육은 지식전달과 이론 중심의 主知主義에 닫혀있는데도 불구하 고, 학습자의 창의력과 사고력 그리고 이해력과 분석력을 종합적으로 판단하겠다는 논술 유형을 평가의 한 축으로 제시하는 것은 先後가 맞지 않아 보인다. 중등학교 현장교육에서 ‘논술’ 유형을 하나의 평가群으로 도입/실행하기 위해서는 우선 그에 대한 전제로서 수업방식부터 토론과 논술이 유도될 수 있도록 전환되어야 한다. 실제 수업은 교과서 내에서 다뤄지는 교육과정 요소들을 암기하는 것임에 불과한데, 정작 평가는 서술이나 단답 형의 수준을 넘어 논술까지를 요구한다는 점에서 상호 간의 균형과 선후가 맞지 않다. 그럼에도 불구하고, 漢文 교과에서 논술평가가 가능한 유형이 무엇인지를 선제적으로 고민하고 개발하는 것은 어쩌면 유의미한 일이 될 수도 있다. 왜냐하면, 漢文 교과만이 갖고 있는 과목의 특성과 성격이 ‘論述’ 평가에 부합할만한 부분이 적절하기 때문이다. 한편, 기존 漢文 교과수업과 그에 대한 평가가 주로 객관식이거나 혹은 단답형 유형으로 이루어져 왔다. 그러나 漢文 교과가 언어생활과 비판적 가치관을 습득하기 위해서는 일정정도 자신의 견해에 대하여 논리와 체계를 갖추고 이를 서술시키게 만드는 논술형 문항 개발에 대하여 선제적으로 고민할 필요도 있다. 다만, 한문교과 내에서도 세부영역에 따라 문형이 달라질 수 있는 개연성에 초점을 맞춰야할 것이다. 이 글은 이러한 입장을 견지하고, 중등교육 한문교과에서 다뤄질 수 있는 논술형 문항의 몇 가지 예시를 선보이고자 하였다. This article is focused on the development of essay test items that can be dealt with in secondary school ‘Chinese textbook’. At present, most of the frontline secondary school field education is concentrated on entrance exam oriented education, and is carried out in a way that is immersed in memorization or knowledge transfer. In contrast to the reality of this school, according to the entrance exam tendency suggested by each university and the policy dimension of the secondary education, the ‘discussion’ is recommended as another evaluation type in the sense that it promotes the comprehensive thinking and understanding of the learner. However, as the curriculum can be matched with the corresponding evaluation of educational achievement, it is also natural that the teaching and learning evaluation according to the model of teaching and learning is matched. However, the on - site education is carried out through knowledge transfer and theory - centered education. It is not right and wrong to evaluate the essay exam to comprehensively judge learners creativity, thinking ability, comprehension and analytical ability. In order to introduce and execute the essay test as an evaluation method in the secondary school field education, the premise must be changed so that discussions and essays can be derived from the teaching method. Practical lessons are merely memorizing or acquiring the elements of the curriculum that are handled in the textbooks, and evaluation is not appropriate for the balance and prosperity in that it requires essay writing beyond the description or short answer. Nevertheless, preliminary thinking and development of what types of essays can be evaluated in Chinese textbooks may be meaningful. This is because the characteristics and the nature of subjects that only Chinese textbooks have are appropriate for essay examination. This article holds this position and shows some of the essay test questions that can be addressed in secondary school Chinese textbooks.