Ray tracing simulation of SCOTS test for GMT secondary mirror

김기원,김성환,김영수,Kim, Ki-Won,Kim, Sug-Whan,Kim, Young-Soo 한국천문학회 2012 天文學會報 Vol.37 No.2

We present SCOTS test simulation for on axis segment of the GMT secondary mirror that is ellipsoidal shape surface of 1.064m in diameter, 4.166747m in radius of curvature, -0.7154 in conic constant and $18.023{\mu}m$ P-V in asphericity. SCOTS test comprises a screen(diffusing sinusoidal fringe source), test surface(GMT secondary mirror), and a camera(CCD detector). We report ray tracing simulation result that is distorted sinusoidal fringe pattern detected at the camera. This simulation is to be used for analysis of experimental design, sensitivity from uncertainty, errors on fabrication and design.

WDM 전광망에서 라우팅과 파장할당을 위한 휴리스틱 방법에 대한 연구

김기원,정영철,Kim, Ki-Won,Chung, Young-Chul 대한전자공학회 2001 電子工學會論文誌-TC (Telecommunications) Vol.38 No.8

The recent explosion in the Internet applications, Internet. host number and the traffic in the IP backbone network is posing new challenges for transport network. This requires a high-speed IP backbone network that has a substantially higher bandwidth than the one offered by current networks, which prompts the development of all-optical network. To obtain optical network utilization gains, we need a software which establishs logical topology to make possible the efficient use or physical topology, and control the optical network in combination with the IP layer routing protocols. Finally, the logical topology is required higher efficient than physical topology. For this an efficient algorithm for the routing and wavelength assignment(RWA) in the WDM all-optical network is necessary. In this paper, two kinds of heuristic algorithms to establish logical topology for WDM networks and arc applied to the design of logical topology of domestic backbone network. These algorithms are found to work quite well and they arc compared with each other in terms of blocking rate, etc. 최근 인터넷 응용계층, 사용자수와 IP 백본망에서 트래픽의 폭발적인 증가는 전송망에 대해서 새로운 변화를 요구하고 있다. 이에 따라 대용량 WDM시스템들이 광범위하게 설치되고 있으며 이를 인터넷에 효율적으로 운영하기 위하여 IP/WDM을 구현하려는 노력이 진전되고 있다. WDM 전광망의 이용이득을 얻기 위해서는 IP 계층의 라우팅 프로토콜과 함께 전광망의 물리적인 망을 효율적으로 활용하게 해주는 논리적 토폴로지를 형성하고 광망을 제어하는 소프트웨어가 필요하다. 이를 위하여 WDM 전광망에서의 라우팅과 파장할당(RWA)을 효율적으로 수행할 수 있는 알고리듬이 필요하다. 본 논문에서는 WDM 전광망의 논리적인 토폴로지 형성을 위한 두 개의 직관적인 알고리듬을 구현하여 국내 백본망에 적용하였으며, 이들이 잘 동작함을 보였고 이들을 블록킹율등의 측면에서 비교분석하였다.

Al-Li계 합금의 가공열처리에 따른 조직과 기계적성질의 변화

김기원,우기도,이광로,이민상,이민호,황호을 ( Ki Won Kim,Kee Do Woo,Kwang Ro Lee,Min Sang Lee,Min Ho Lee,Ho Eul Hwang ) 한국열처리공학회 1991 熱處理工學會誌 Vol.4 No.3

The present work was aimed to examine the variation of precipitations and mechanical properties by thermomechanical treatments(TMT) in Al-2.19wt%Li and Al-2.0wt%Li-0.11wt%Zr alloys. This study was perfomed by TEM, SEM observation, DSC, electrical resistance measurement, hardness and tensile strength measurment. First peak of resistivity aged at 90℃ was caused by precipitation of δ` -precursor phase, and second peak was caused by precipitation of δ` phase. According to this result, the precipitation process of Al-2.19wt%Li alloy was as follow : SSSS→δ` -precursor phase→δ`(Coherent→Semi-coherent)→δ In a Al-2.0wt%Li-0.11wt%Zr ternary alloy, the first peak of resistivity was appeared at initial aging heat-treatment. It is result from exsistant of δ` -precursor phase. The effect acceleration in a binary alloy was not appeared and the over-aging ternary alloy was accelerated with increase of the reduction rate. 1t is caused by combination effect of δ` and composite phase.

금강비 측정 교구 개발 및 체험수학활동

김기원,도혜경,Kim, Ki-Won,Do, Hye-Kyung 영남수학회 2010 East Asian mathematical journal Vol.26 No.2

In this study we develop mathematical tools for measuring the Geumgang Ratio and we call them Geumgang Ratio Calipers. Also we show a teaching method for ratio through experimental mathematics. With Geumgang Ratio Calipers students measure the Geumgang Ratio in their bodies, materials for everyday life and the Sukgulam. Through this activity, students obtained an interest in mathematics and gained a positive attitude for mathematics.

이앙전작 청예작물 재배에 관한 연구 1 . 이앙전작 청예 옥수수의 예취 시기가 후작 ( 수도작 ) 의 생육 및 수량에 미치는 영향

김기원,조헌조,이을희 ( Ki Won Kim,Cho Hyen Cho,Ell Hee Lee ) 한국축산학회 1979 한국축산학회지 Vol.21 No.4

This experiment was carried out to investigate the effect of the cutting stages on the yield of soiling corn (previous crop), and the characteristics and the yield of paddy rice (following crop) to set up the reasonable crop rotation system on following paddy field in she southern area. The results obtained were as follows: 1. The height of soiling corn was higher as the cutting stage was prolonged. 2. The highest yield (7,445 ㎏/10a) was in the plot cut on 23, June among cutting stages. The yield of the plot cut on 3, June was less then three plots cut 13 June, 23 June and 30 June, `There was no significant differences between two plots cut on 23 June and 30 June. 3. The highest dry matter yield(1388.91 ㎏/ l0a) was in the plot cut on 30 June of all. There were significant differences (p$lt;0.01) on the dry matter yield of each plot. It was increased as the growth stage was prolonged. 4. Rice growth (Milyang 15), following crop transplanted on 23 June, was no difference as compared with that of the common cultivation transplanted on 18 June. However, the same crop transplanted after June 23 was not grown well. 5. The highest rice yield (570.36㎏/l0a) was in the plot transplanted on 13 June the plot transplanted on 3 June produced more yield than two plots transplanted on 23 June and 18 June and(common cultivation)and the plots transplanted on 23 June and after 18 June were less than others in the rice yield. Therefore, it may be concluded that there was no difficulties on the production and the growth of rice cultivation after soiling corn cultivation when rice paddy was transplanted before 23 June in the southern area.

조현병(調鉉病) : 뇌 연결성의 장애

김기원,박경민,장혜련,이유상,박선철,Kim, Ki Won,Park, Kyung-Min,Jang, Hye-Ryeon,Lee, Yu Sang,Park, Seon-Cheol 대한생물정신의학회 2013 생물정신의학 Vol.20 No.4

Objectives We reviewed cellular and synaptic dysconnectivity, disturbances in micro- and macro- circuitries, and neurodevelopmentally-derived disruptions of neural connectivity in the pathogenesis of schizophrenia. Method We reviewed the selected articles about disturbances in neural circuits which had been proposed as a pathogenetic mechanism of schizophrenia. Results The literature review reveals that schizophrenia may be a disease related to disturbance in neurodevelopmental mechanism, shown as 'a misconnection syndrome of neural circuit or neural network'. In descriptive psychopathological view, definition of a disorder of brain connectivity has limitation to explain other aspects of schizophrenia including deterministic strictness in thought process. Conclusion Schizophrenia is considered as a disorder of brain connectivity as well as a neurodevelopmental disorder related with genetic and environmental factors. We could make a suggestion that "JoHyeonByung (attunement disorder)" denotes the disturbances of psychic fine-tuning which correspond to the neural correlates of brain dysconnectivity metaphorically.

공격성의 신경생물학

김기원,안은숙,이유상,박선철,Kim, Ki Won,An, Eun-Soog,Lee, Yu-Sang,Park, Seon-Cheol 대한생물정신의학회 2013 생물정신의학 Vol.20 No.4

Aggression can be defined as 'behavior intended to harm another' which can be seen both from humans and animals. However, trying to understand aggression in a simplistic view may make it difficult to develop an integrated approach. So, we tried to explain aggression in a multidisciplinary approach, affected by various factors such as neuroanatomical structures, neurotransmitter, genes, and sex hormone. Parallel with animal models, human aggression can be understood with two phenomena, offensive aggression and defensive aggression. Neurobiological model of aggression give a chance to explain aggression with an imbalance between prefrontal regulatory influences and hyper-reactivity of the subcortical areas involved in affective evaluation, finally in an aspect of brain organization. Serotonin and GABA usually inhibit aggression and norepinephrine while glutamate and dopamine precipitate aggressive behavior. As there is no one gene which has been identified as a cause of aggression, functions between gene to gene interaction and gene to environment interaction are being magnified. Contributions of sex hormone to aggression, especially molecular biologic interaction of testosterone and regulation of estrogen receptor have been emphasized during the research on aggression. This multidisciplinary approach on aggression with types, neurochemical bases, and animal models can bring integrated interpretation on aggression.

한국 음악 속의 수학

김기원,안선필,Kim Ki-Won,Ahn Sun-Phill 한국수학사학회 2004 Journal for history of mathematics Vol.17 No.4

수학과 음악은 그 표현 방법이 아주 다른 학문이지만, 오래 전부터 수학과 음악이 관련이 있음을 이야기 해오고 있다. 이 논문에서는 수학과 한국 음악의 관계를 고찰해보고 수학 교육에의 활용 방안을 모색해 본다. Even though mathematics and music play very different roles in our society, they are closely related to each other. In this paper, we studies relations between mathematics and Korean traditional music, and give some ideas to use such relations in mathematics education.

율무의 사료적 가치에 관한 연구 1 . 파종시기가 율무의 생육 및 조곡생산에 미치는 영향

김기원,강봉태,문승식 ( Ki Won Kim,Bong Tae Kang,Sueng Sik Moon ) 한국축산학회 1976 한국축산학회지 Vol.18 No.1

This experiment was carried out to investigate the seeding period on the characteristics and grain production of Coix lacryma L. The results obtained are as follows: 1. The height of plants, leaf-size and number of tiller were higher in the treatment sown from late March to late April than in the treatment sown in May. 2. The height of plant was decreased as the seeding period progressed. However the number of seed per plant was increased as the seeding period progressed. 3. A highly (p$lt;0.001) significant difference was found in the production of grain according to the seeding periods. The treatment sown March 20 and April 8 produced 709.3㎏ and 681㎏ of grain per 10a, respectively and produced the highest amount among all the treatments. However the production of grain in the, treatments sown after May was decreased. 4. Average rice cleaning of Coix lachryma L. was 40%. 5. According to this experiment, the moderate seeding period of Coix lacryma L. was from late May to late April. 6. The crude protein of grain of Coix lacryma L. was 16.47%. Therefore it may be concluded that Coix lacryma L. can be used as a feed and food.

이앙전작 청예작물 재배에 관한 연구 2 . 수도전 청예옥수수의 예취 시기가 초장 , 수량 , 일반조성분 및 토양의 pH , 유기질 함량에 미치는 영향

김기원,조헌조,김대성 ( Ki Won Kim,Hyen Cho Cho,Dae Sung Kim ) 한국축산학회 1979 한국축산학회지 Vol.21 No.6

To investigate the reasonable utilization method of paddy field in southern district ,this experiment was carried out to detect the effect of cutting stage on the grass height, yield and chemical composition of green crop cultivated in the paddy field which was idle and on the pH and organic matter of Soil. The results obtained were as follows. 1. Grass height of yellow corn cut on June 20 was 231.29㎝ on the green basis and highest among the treatments. Grass height of yellow corn cut on June 1 was 174.77㎝ on the green basis and shortest among the treatments. In the cutting stage, significant differences were found out between treatments (P$lt;0.05). However there were no difference between grass height of yellow corn cut on June 15 and June 20 on the green basis. 2. In the ratio of leaf to stem, leaf was generally higher than stem. However treatments cut on June 1 and June 20 have slightly less leaf than treatments cut on other cutting stage. 3. In the green yield, treatment cut on June 20 produced the highest yield (8969.33㎏ per l0a) among treatments. Treatment cut on June 1 produced the lowest yield(7296.67㎏ per l0a)among treatments. There were significant, differences (P$lt;0.05) between cutting stages in the green yield. Yield was increased as the cutting stage was late. 4. In the dry matter yield, treatment cut on June 1 produced the lowest yield(796.08㎏) and treatment cut on June 20 produced the highest yield among treatments. Dry matter yield was generally increased as the growth stage progressed. 5. In the chemical composition, treatment cut early was high in crude protein content and low in crude fiber content of soiling corn. However crude fiber content of soiling corn was increased as the growth stage progressed.. 6. pH of soil was higher in the field fertilized after than in the field fertilized before. pH of soil was progressively decreased as the cutting stage was prolonged and was lower than that of soil fertilized before. 7. In the organic matter content of soil, treatments cut on June 5 and June 10 were lower in organic matter content than before fertilization. Other treatments were similar to organic content of soil fertilized before. Therefore according to this experiment, it may be concluded that there were no influences on the cultivation of rice when soiling crop (corn) was cultivated in the paddy field before transplanting rice.