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데이터 전송률과 전력 소모를 동시에 고려한 무인기 이동경로 최적화
정원철(Won Cheol Jeong),한수민(Sumin Han),최지훈(Jihoon Choi) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문에서는 무인기를 이동형 기지국으로 사용하는 경우 데이터 전송률과 무인기의 전력 소모를 동시에 고려한 이동경로 최적화 방안을 고려한다. 제안된 기법에서는 무인기의 출발 및 도착 위치, 다수 사용자의 위치 정보가 주어질 때, 무인기 속도 및 가속도에 대한 제약 조건을 고려하여 사용자별로 통신 데이터 전송률과 비행 에너지 소모 비율을 계산하고, 최대-최소 에너지 효율 최적화 관점에서 해당 지역 내에서 최적의 이동경로를 도출한다. 제안된 알고리즘을 다수 사용자가 배치된 환경에 적용하여 모의실험을 수행하고, 최적 이동경로, 시간에 따른 속도 변화, 최적 에너지 효율을 도출한다.
Ni과 Pd을 이용한 비정질 실리콘의 저온 측면 결정화에 관한 연구
이병일,김광호,정원철,신진욱,안평수,주승기,Lee, Byeong-Il,Kim, Gwang-Ho,Jeong, Won-Cheol,Sin, Jin-Uk,An, Pyeong-Su,Ju, Seung-Gi 한국재료학회 1996 한국재료학회지 Vol.6 No.9
비정질 실리콘의 표면에 Ni과 Pd를 형성하여 측면으로의 결정화 속도를 향상시켰다. Ni에 의해 비정질 실리콘이 측면으로 결정화될 때 그 성장 속도는 50$0^{\circ}C$에서 3w$\mu\textrm{m}$/hour였으며 이때의 활성화 에너지는 2.87eV로 나타났다. Pd의 경우는 Pd2Si의 형성에 의해 압축 응력이 유발되어 Pdrks의 간격이 좁을수록 측면으로의 결정화 속도가 증가하였다. Ni과 Pd을 각각 다른 부분에 증착시키고 결정화시키면 Ni에 의해 측면으로 결정화되는 속도가 Ni만으로 결정화시킬 때 보다 약 2배 이상의 측면결정화 속도를 보였다.
박수연,나창수,정원철,이종철,Park, Soo-Yeon,Na, Chang-Soo,Jeong, Won-Cheol,Lee, Jong-Cheol 대한한방안이비인후피부과학회 2013 한방안이비인후피부과학회지 Vol.26 No.3
Objective : The primary purpose of present study is to evaluate the effect of herbal cosmetics containing Cortex Betulae Platyphyllae extract complex on acne. The second is to comparatively evaluate safety of this cosmetics. Methods : We opened collecting of applicant that men and women(the 18~35-year-old) with acne on face. We selected subjects who came up to entire inclusion criteria and were not included in the exclusion criteria. We checked changes of Acne Global score, skin sebum, moisture, pores counts, Skindex-29 for 8 weeks. Results : 1. Comparison of changes in Global score, it declined in both experimental group and control group. But Experimental group showed a statistically significant decline than control group. 2. Comparison of changes in sebum and moisture, it declined in both experimental group and control group. But there was no statistically significant difference between those two groups. 3. Comparison of changes in erythema normal area, it declined in both experimental group and control group. But there was no statistically significant difference between those two groups. 4. Comparison of changes in pore counts, it increased statistically significantly in both experimental group and control group. 5. Comparison of changes in Skindex-29, it declined in both experimental group and control group. But there was no statistically significant difference between those two groups. Conclusion : Considering the above experiments, it is suggested that herbal cosmetics containing Cortex Betulae Platyphyllae extract complex have a positive effect on acne.
박수연,나창수,정원철,이종철,Park, Soo-Yeon,Na, Chang-Su,Jeong, Won-Cheol,Lee, Jong-Cheol 대한한방안이비인후피부과학회 2012 한방안이비인후피부과학회지 Vol.25 No.3
Objective : The aim of this study is to find the therapeutic meaning of Pericarpium Granati and Cortex Betulae Platyphyllae in herbal medication. Methods : About the origin, the component, the processing the drug, the properties and tastes of drugs, the meridian tropism, the effects, the treating disease, the contraindication and the method of adminictration, I have researched 23 literatures and 10 disquisitions to mention the Pericarpium Granati and Cortex Betulae Platyphyllae. Result : 1. Pericarpium Granati is pericarp of mature fruit of The Pomegranate belongs to Punicaceae and Cortex Betulae Platyphyllae is bark of Betula platyphylla var. japonica (Miquel) Hara belongs to Betulaceae. 2. Pericarpium Granati consists of tannin 10.4~21.3%, lead 0.8%, resin 4.5%, mannitol 1.8%, sugar 2.7%, gum 3.2%, inulin 1.0%, musilage 0.6%, gallic acid 4.0%. Cortex Betulae Platyphyllae consists of betulin about 35%, various higher fatty acid about 35%, tannin about 7%. 3. The properties and taste of Pericarpium Granati is acid, astringency, warm, nontoxic and the meridian tropism is mainly stomach and large intestine meridian. The properties and taste of Cortex Betulae Platyphyllae is bitter, cold, nontoxic and the meridian tropism is mainly stomach meridian. 4. Pericarpium Granati has come into general use to treat roundworm, tapeworm, old diarrhea, anal prolapse, melena, metrorrhagia, leukorrhea, stomachache from worms, scabies etc. because it is effective on insecticiding, stopping diarrhea, controling hemorrhage and leukorrhea. Cortex Betulae Platyphyllae has come into general use to treat shigellosis, diarrhea, jaundice, cough, sputum, tonsillitis, pneumonia, nephritis, furuncle, prurigo, acne etc. because it is effective on cooling down heat, circulating humidity, removing phlegm, stopping cough, neutralizing poison. 5. Pericarpium Granati and Cortex Betulae Platyphyllae is useful method to external care. To use the herba, pulverize amount of property and then apply to the affected part. Conclusion : This study showed that Pericarpium Granati and Cortex Betulae Platyphyllae is useful herb to treat of skin disease and useful method to external care.
CoO를 절연층으로 이용한 스핀 의존성 터널링 접합에서의 자기저항 특성
정창욱(Chang-Wook Jeong),조용진(Yong-Jin Cho),안동환(Dong-Whan Ahn),정원철(Won-Cheol Jeong),조권구(Kwon-Koo Cho),주승기(Seung-Ki Joo) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.4
MR characteristics in magnetic tunnel junction using CoO as the oxide barrier were investigated. Spin-dependent tunnel junctions were fabricated on 4° tilt-cut (111)Si substrates in 3-gun magnetron sputtering system. The top and bottom ferromagnetic electrodes were Ni_(80)Fe_(20)(300 Å) and Co(300 Å), respectively. The oxide barriers(CoO) were formed by the thermal oxidation at room temperature in an O₂ atmosphere and the plasma oxidation. The increase of coercive field due to antiferromagnetic-ferromagnetic coupling has been observed in O₂ plasma-oxidized CoO based junctions at room temperature. At a sensing current of 1 ㎃, MR ratios of O₂ plasma-oxidized CoO based junction and thermal-oxidized CoO based junction at room temperature were 1 % and 5 %, respectively. Larger MR ratios are observed in magnetic tunnel juctions with thermal oxidized CoO when sensing current more than applied 1.5 ㎃. At a sensing current of 1.5 ㎃, we have observed MR value of 28 % and specific resistance (RA=R×A) value of 10.9 ㏀×㎛². When specific resistance values reached 2.28 ㏀×㎛², we have observed that MR ratios become as high as 120 %.
자연어 처리와 Diffusion 모델을 이용한 동화 장면 생성
김승주(Seung-ju Kim),정원철(Jeong-won cheol),박지호(Ji-ho Park),편수장(Soo-jang Pyeon),이동훈(Dong-Hoon Lee),고병철(Byoung Chul Ko) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
This paper proposes a system that uses a fine-tuned diffusion model to generate fairy tale images from text inputs for children. This system consists of three modules: a natural language processing module that converts mixed Korean and English texts into suitable prompts for the diffusion model, a text-to-image generation module that uses a pre-trained stable diffusion model with low-rank adaptation and negative prompts, and a mobile application that allows users to interact with the system through text inputs and displays the generated images. This paper evaluates the performance and usefulness of the system for text input and discusses the applications and limitations of the system.