표준 모델 3자유도 위너-호프 제어기 설계

민덕기,박기헌 成均館大學校 科學技術硏究所 2000 論文集 Vol.51 No.1

This paper presents a method for the design of 3DOF (3-Degree-of-Freedom) Wiener-Hopf controllers which improve design capability of the conventional 1DOF controllers. The new method allows optimal formula for a MIMO system. This paper proposes the structure of 3DOF controller which makes it possible to treat disturbance, measurement noise and reference input independently. Wiener-Hopf optimization technique is used to obtain the optimal and robust controller which stabilizes the generalized plant and minimizes a cost function of a quadratic form. In this paper, state-space representations of the 3DOF Wiener-Hopf controllers are presented in terms of ARE solutions.

VTK를 이용한 시각화 프로그램의 개발

이원기, 김용일, 권득철, 윤남식 충북대학교 컴퓨터정보통신연구소 2008 컴퓨터정보통신연구 Vol.16 No.1

-본문참고-

항공레이저측량 자료를 이용한 시가지 건축밀도 평가에 관한 연구

이근상,고덕구,조기성 한국지리정보학회 2003 한국지리정보학회지 Vol.6 No.3

본 연구에서는 최근 도시계획, 수자원 및 방재 분야에서 높은 관심을 가지고 연구중인 항공레이저측량기법을 활용하여 시가지의 건축밀도를 평가하였다. 먼저, 레이저스캐너인 LiDAR(light detection and ranging)로 취득한 표고자료로부터 DEM(digital elevation model)과 DSM(digital surface model)을 구축하였으며, 건물의 높이를 계산하기 위해 DEM에는 ZONALMEAN 필터, DSM에는 ZONALMAJORITY 필터를 적용하였다. 필터링 과정으로부터 계산한 층수와 현지조사의 층수를 비교한 결과 표준오차 ±0.199층을 확보할 수 있었다. 또한 건물 연면적 레이어와 구획레이어를 중첩하여 통계분석함으로서 도시 구획별 용적률을 제시할 수 있었다. 항공레이저측량 자료를 이용하여 계산한 용적률과 현지조사로부터 계산한 용적률의 비교 결과, 용적률의 표준오차를 ±2.68%로 확보할 수 있었다. 따라서, 항공레이저측량 자료는 향후 토지이용계획을 수립하는 의사결정자에게 매우 유용한 자료를 제공해 줄 것으로 기대한다. This study evaluated the architectural density of urban district using airborne laser scanning(ALS) that is a method used in urban planning, water resources and disaster prevention with high interest recently. First, digital elevation model(DEM) and digital surface model(DSM) was constructed from Light detection and ranging(LiDAR). For getting the height of building, ZONALMEAN filter was used in DEM and ZONALMAJORITY filter was used in DSM. This study compared the floor from filtering with the floor from survey and got standard error, which is ±0.199 floor. Also, through the overlay and statistical analysis of total-area layer and zone layer, we could present floor area ratio by zone. As a result of comparison with floor area ratio between airborne laser scanning data and survey data, the standard error of flor area ratio shows ±2.68%. Therefore, we expect that airborne laser scanning data can be a very efficient source to decision makers who set up landuse plan in near future.

태권도 품새 수련이 아동의 심박수, 심근산소소비량, 에너지 대사에 미치는 영향

정성태,전태원,박익렬,정덕조,우재홍,이광희,이동기,강현주 서울대학교 체육연구소 2000 서울大學校 體育硏究所論集 Vol.21 No.1

The Taegeuk Poomse 1 through 8 of Taekwondo are based upon eight major branches of philosophical theories. The propose of this study was to investigate the nfluence of Taekwondo poomse trainning on heart rate, MVO2, energy metabolism in primary school students. Subjects for this study were eight male the fifth∼sixth grades students who participated in exercise program consist of Taekwondo poomse trainning in dojang which is located in Shinlim-2dong, Kwanak-Gu, Seoul(12.7± 0.5years, 150.8 ±4.6cm, 45.1 ± 9.4kg, 24.9 ± 9trainning length). The results of thet this study are as follows: 1) The average of heart rate was Taegeuk Poomse 1 through 8 of Taekwondo 90.57± 4.gbeats/min in rest and 139.7 ± 17.5beats/min in exercise. The minimum heart rate was 89.0±2.8, peak heart rate was 167.1 ±6.4 in exercise. It was ranged from 42% to 80% 2) of the max heart rate and ranged 42 to 65%HRmax. Taegeuk 1 Jang was differenced with others Jangs significantly(p<0.05), 2) The time of the Taegeuk 1 through 8 Jang of Taekwondo was 5minutes 12seconds. Heart rate was ranged from 90.6 ± 7.85beats/min to 171.8 ±8.Ibeats/min and increased linearly. 3) The average of the MVO2 was 11.1 ±0.78mmHg · bpm-3 in rest and 19.1 ± 1.2mmHg ㆍbpm-3 in exercise. MVO2 was ranged from 10.5mmHg · bpm-3 to 20.3mmHg · bpm-3. There were not difference between Taegeuk Poomses(p<0.05). 4) The energy metabolism was as follows: Mean VO2 Respiratory exchange ratio, energy consumption were 0.51(V02L/min),0.71(RQ),2.32Ckca1/min) in rest respectively. but In exercise Mean VO2 Respiratory exchange ratio, energy consumption were 0.89 ± 0.18( V 02L/min), 0.79±0.08(RQ), 4.26±0.51(kcal/min) respectively . The difference was only between Taegeuk 1 Jang and Taegeuk 3 Jang(p<0.05). This study showed that the Taekwondo Poomse trainning was proper exercise for fitness, body composition and weight control in normal, abnormal(obese) children because the Taekwondo trainning are dynamic and exciting sport.

학술논문 : 통일 후 적정 군사력 규모 산정에 미치는 영향요인 도출 및 중요도에 관한 연구

이기덕 ( Gi Deuk Lee ),이선규 한국군사학회 2015 군사논단 Vol.84 No.-

We know that Unified Korea should maintain optimal size of military force power after two Koreas`` unification. This study addresses "What factors are influencing when we decide the optimal size of military force power after unification in Korean Peninsula?" This paper aims to ‘provide judgement grounds for optimal size of military power’ through researching ‘factors which influence choosing the size of military powers.’ First, the unification processes of separated countries which had similar division history were studied. Second, military integration process was researched in detail. Third, factors considered in history on judging or building military force were examined through existing studies and researches by military scholars. Fourth, "expected factors need to be considered for judging proper military force power of unified Korea" were selected through the courses mentioned above, and as a result, final factors were chosen by experts`` discussion and questionnaire with Delphi technique. Lastly, every single factor was verified and measured by importance through AHP technique. The result is that the importance of five areas in first hierarchy was analyzed as follow: ① international relations/order(30.0%), ② military(25.0%), ③ economic(18.0%), ④ political(14.0%), ⑤ social (13.0%). The result of importance analysis on all the areas and factors from the first and second hierarchy is as follows. The major factors from the top 5 list indicates that ① ROK-US alliance was analyzed the most influential one. Next, ② military policy/strategy, ③ security environment around the Korean Peninsula, ④ S. and N. Korea relations, ⑤ the level of national economic power follow. In conclusion, this study is meaningful because "the factors we should consider deciding the optimal size of military power after two Koreas`` unification" hasn``t been researched. It also categorized 29 factors into five areas to measure the importance of all influential factors and suggest priority. I expect that this study would be helpful for judging the optimal size of military power after two Koreas are unified, and also provide ideas for further research.

H₂와 H<SUB>∞</SUB> 제어 기법을 이용한 전력계통 안정기의 설계

閔德基(Deuk-Gi Min),趙容奭(Yong-Seok Cho),朴基憲(Ki-Heon Park) 대한전기학회 1996 전기학회논문지 Vol.45 No.5

압축기를 이용한 하이퍼루프 시스템의 공기역학적 특성에 대한 연구

박기득(Gi-Deuk Park),김지훈(Jihoon Kim),장경식(Kyeongsik Jang),유재영(Jaiyoung Ryu) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11

To reduce drag and relieve the pressure wave in the hyperloop system, compressor was mounted at the front of the pod. Two-dimensional axisymmetric simulations were conducted, and overset mesh method was applied for moving mesh simulation. The length of the hyperloop tube is 1200 m, the diameter is 5 m, the length of the pod is 43 m, the diameter is 3 m, and the diameter of the compressor is 2 m. To compare the effectiveness of the compressor, three different compressor capacities were applied for each speed of 250 m/s, 300 m/s, and 350 m/s. Ansys Fluent software was used to proceed with the interpretation, and a turbulent model based on the RANS model was applied. It was found that the larger the compressor capacity, the more relaxed the flow of the surrounding compressor and the less drag compared to the without compressor cases.

영양사의 기호도에 따른 학교급식에서 전통음식의 이용실태와 활용증대 방안

안기덕(Gi Deuk Ahn),송경희(Kyung Hee Song),이홍미(Hong Mie Lee) 대한지역사회영양학회 2010 대한지역사회영양학회지 Vol.15 No.4

The study was conducted to assess school dietitians` preferences for traditional foods, to determine the association with their perception and usage status, and to develop the strategies to increase its utilization of traditional foods in school lunches. The information was obtained by the self-administered questionnaire from the subjects, which were 198 dietitians in schools located in Seoul and Gyeonggi-do. According to the preference for traditional foods, subjects were distributed into three groups (High = 54, Medium = 128, Low = 16). The significances of differences between groups were determined using SPSS 12.0 at p < 0.05. Compared to the dietitians with lower (medium and low) preferences, those with high preferences answered that they had better knowledge (p < 0.001) for traditional foods, and served them more in school lunches (p < 0.01). Also, more dieticians in the high preference group not only felt that they need to train school administrators (p < 0.01) as well as themselves (p < 0.05), but also were currently providing students with the nutrition education on traditional foods (p < 0.05). The results presented the evidence suggesting that having dietitians with higher preference for traditional foods can offer an effective strategy to increase the opportunities for schoolchildren to be exposed to traditional foods. Development of the standard recipes for use in school lunches by the government or the association was answered as the best strategy to increase the use of traditional foods, regardless of the dietitians` preferences. (Korean J Community Nutrition 15(4): 550~559, 2010)

‘국민의 의지’가 전쟁의 결과에 미친 영향

이기덕(Lee, Gi-deuk),이선규 국방부 군사편찬연구소 2013 군사 Vol.- No.88

In the modernized warfare, all the forces are being integrated to win the war. victories in any war can no longer be achieved merely by a variable or two. There are certain types of variables that are defined as archetypical tangible elements such as the national leader’s war leadership, military power, economic power, reserve forces, and mobilization capabilities, etc. In addition to those tangible elements, there are intangible elements--such as politics, science, technology, and social cultures -- these are also considered as the vital variables that would determine victory in war. Another factor that would determine the result of war is recognizing the importance of the “will of the people”, which is another type of intangible element. War causes significant damages to the people directly involved in it, and the damages are catastrophic. For instance, many people will nearly starve to death, and vast majority of people will lose their shelters because their houses will be destroyed. Moreover, heating system will fail to keep people warm. While there will be numerous displaced civilians, blackouts and lack of water supply will cause a great difficulties to the people. The government will increase taxes, and issue war bonds to provide funding during the war. Many men will be conscripted to fight the war, and women, on the other hand, will be sent off to the factories to manufacture weapons and ammunition. In the mix of helter-skelter, some nation have overcame its suffering and achieved victory. While other nations could not over come the suffering from war, and thus conducted anti-government activities that led to losing the war. If war breaks out in the Korean peninsula, it is no doubt that the war will cause national calamities. Whatever the cause, the war must be avoided. It is vital to achieve victory if war breaks out. In order to achieve such a task, the citizens will have no choice but to serve in the military with various military tasks assigned to them, while they limit the citizen’s right. Hence, throughout this process of fighting the war, the result of war will be significantly determined by the will of Korean people. As a conclusion, it is exigent to argue that the citizens must show their determination to win victory in war, and the government must use any necessary means to support the citizens so that they can fight for victory.

습식 화학 식각에 의한 다결정 실리콘 웨이퍼의 표면 분석 및 효율 변화

박석기(Park Seok-Gi),도겸선(Do Kyeom-Seon),송희은(Song Hee-Eun),강기환(Kang Gi-Hwan),안형근(Ahn Hyung-Keun),한득영(Han Deuk-Young) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4

Surface Texturing is an essential process for high efficiency in multi-crystalline silicon solar cell. In order to reduce the reflectivity, there are two major methods; proper surface texturing and anti-reflection coating. For texturization, wet chemical etching is a typical method for multi-crystalline silicon. The chemical solution for wet etching consists of HF, HNO₃, DI and CH₃COOH. We carried out texturization by the change of etching time like 15sec, 30sec, 45sec, 60sec and measured the reflectivity of textured wafers. As making the silicon solar cells, we obtained the conversion efficiency and relationship between texturing condition and solar cell characteristics. The reflectivity from 300㎚ to 1200㎚ was the lowest with 15 sec texturing time and 60 sec texturing time showed almost same reflectivity as bare one. The 45 sec texturing time showed the highest conversion efficiency.