마이크로 컴퓨터를 利用한 디지탈 位相機의 設計

田喜鍾,嚴相五,柳建洙 釜山工業大學校 1991 論文集 Vol.33 No.-

This paper describes the measurement techniques of measurement a digital phase meter using the Dual-Slop principle of D/A conversion and micro-computer. The signal process makes use of the 8 bit D/A converter and the counter. For measuring process the value of phase difference is measured in 2 cycle of input waveforms and computed in micro-computer. Measurement range is 0? to 90? in phase difference and 0 to 200 Hz in frequency. The result show that digital measurement values are in a good agreement with an analog measurement values.

Mo-실리사이드 형성 메카니즘에 관한 연구 : Ⅱ. 表面 Morphology와 電氣的 特性 Ⅱ. Surface Morphologies and Electrical Properties

박종윤,한전건,이상균,김기선 성균관대학교 기초과학연구소 1992 論文集 Vol.43 No.2

Mo-disilicide 박막은 n-Si(100) 기판위에 전자선 증착과 이어지는 진공 또는 질소 분위기에서 급속 열처리(RTA : Rapid Thermal Annealing) 장치에 의한 열적 확산(thermal diffusion)법에 의해서 만들어졌다. 이들 박막의 화학적 조성과 morphology는 XRD, AED(ADP), TEM, NOM에 의해서 분리되어졌다. Mo/Si계의 안정된 최종상은 tetragonal-MoSi₂였고, 표면 morphology와 grain size는 상호 의존하며 열처리 온도에 따하서 크기가 증가되었다. 상온에서 증착한 박막에서는 계면에서 얇은 SiO_2 층이 보였고 이 층의 존재로 Si의 확산이 억제됨을 확인하였으며, 기판온도를 400℃로 유지하며 pre-annealing을 120분 동안 부여한 시료에서는 Mo-silicide가 columnar 구조로 성장됨이 보였다. 그리고, 전기적 특성은 sheet 저항과 Schotty 장벽높이가 조사되었는데, 열처리 온도 증가에 따라 감소하는 sheet저항은 grain size에 의존하며, 최저치는 700℃에서 1분 동안 열처리 한 시료의 값인 2.1Ω/□으로 열처리 온도 증가에 대해 더 이상 변화하지 않는 최종적인 값이다. 그러나 Schotty barrier height는 0.56eV로 열처리 온도, 분위기에 따라 변화하지 않으며 hexagonal-과 tetragonal-MoSi₂둘 모두에서 같았다. Molybdenum disilicide films have been prepared onto n-Si(100) substrates with electron-beam deposition and sequently post-annealing by rapid thermal annealing in the ambient of N₂ or vacuum. The chemical compositions and morphology of films were analyzed by XRD, ADP, TEM, and NOM methods. We confirm that the stable phase of Mo/Si system is tetragonal-MoSi₂ phase, and the surface morphology and grain size were depended upon the annealing temperature. There are SiO₂ layers at the interface of MoSi₂ film evaporated at room temperature and the thermal diffusion of Si was interrupted by the layers. However, the thin films with the substrate temperature of 400℃ have growned to the MoSi₂ with columnar structure. We measured the electrical properties, the sheet resistance and Schottky barrier height, of MoSi₂ thin films. The sheet resistance was depended upon the grain size and the smallest value was 2.1Ω/□ at room temperature after annealing at 700℃ for 1 min. The Schottky barrier height was independed upon the annealing temperature and ambient, and was about 0.56eV for hexagonal- and tetragonal-MoSi₂.

加減茵蔯蒿湯 水鍼液이 膽道結紮로 유도된 肝損傷에 미치는 영향

成樂箕,金元信,田炳薰,李建穆 대한동의병리학회 1993 동의생리병리학회지 Vol.8 No.-

연구배경 : 肝癌 및 肝硬變은 韓國人의 疾病으로 인한 중요한 喪亡原因의 하나이며, 특히 우리나라 B型肝炎의 流行地域으로 急慢性 肝炎이나 肝經辨證, 肝癌의 發病率이 높다. 그리하여 肝硬變症을 寢具治療法중 水鍼을 이용하여 肝의 募穴인 期門穴에 投與하면 治療效果가 있는지에 대하여, 그리고 藥量에 따라 治療效果가 달라지는 지에 대하여 알아보기 위하여 본 연구를 시행하였다. 방법 : 加減茵蔯蒿湯 水鍼液을 膽道를 結紮한 白鼠에 26guage의 1ml 주사기를 이용하여 투여하였다. 經穴은 人體의 期門에 相應하는 左石部位와 腹部內의 任意의 部位를 設定하여 매일 1회 7주간 수침하였다. 결과 : 體重과 Total Bilirubin은 實驗群 A, C에서 有意性 있는 增加와 減少를 보였고, WBC·ALT·AST·ALT 및 Cholesterole은 全實驗群에서 有意性 있는 減少를, Albumin은 全實驗群에서 有意性 있는 增加를 각각 나타내었으며, 組織學的 觀察도 全實驗群에서 有意性을 나타내었다. 또한 Hydroxyproline도 實驗群 A, B에서 有意性있는 減少를 보였다. 결론 : 加減茵蔯蒿湯 水鍼液을 膽道를 結紮한 白鼠의 期門穴에 投與한 缺課 有意한 효과를 보였으나 水鍼量에 따라 有意性의 차이가 있어 敵意한 水鍼量을 투여하는 것이 治療시 重要하다고 思料되며, 또한 水鍼에 대한 安全性 問題에 대하여서도 더욱 硏究할 필요가 있다. In order to study the effects of the water extract of Gagaminjinhotang in the Meridian points Liv 14 on the liver damage indued by bile duct ligation during 7 weeks after the operation of bile duct ligation, blood was taken from the heart and body weight, WBC, RBC, hemoglobin, hematocrit, total bilirubin, ALT, AST, ALP, cholesterol, albumin and hydroxyproline were in each experimental apparatus. The results of this study were as follows; 1. Body weight of EXA, C were significantly increased by the water extract of Gagaminjinhotang. 2. WBC of EXA,B,C were significantly decreased by the water extract of Gagaminjinhotang. 3. RBC, hemoglobin and hematocrit of EXA,B,C were not significantly influenced by the water extract of Gagaminjinhotang. 4. Total bilirubin of EXA,C and direct bilirubin of EXA,B,C were significantly decreased by the water extract of Gagaminjinhotang. 5. ALT, AST,ALP of EXA,B,C were significantly decreased by the water extract of Gagaminjinhotang. 6. Cholesterol of EXA,B,C, were significantly decreased by the water extract of Gagaminjinhotang. 7. Albumin of EXA,B,C, were significantly increased by the water extract Gagaminjinhotang. 8. Hydroxyproline of EXA,B were significantly decreased by the water extract Gagaminjinhtang. 9. On the histological observation, the results of the experimental groups showed significant hepatoprotective effects compared with control group from 3 weeks after the administration of the water extract of Gagaminjinhotang. According to the above result, it is suggested that the water extract Gagaminjinhotang was significantly effective in WBC, bilirubin, ALT, AST, ALP, cholesterol, albumin and hydroxyproline level and then it seems to be applicable to the fibrosis or cirrhosis of liver.

가공열처리에 의한 Ti-6Al-4V 합금의 조직 및 경도 변화에 대한 연구

서동이,김성진,한전건 成均館大學校 科學技術硏究所 1988 論文集 Vol.39 No.2

The microstructure and hardness change by thermomechanical processing was studied in the temperature range of α+β phase(800℃) and above the β-transus temperature(1,050℃) respectively in Ti-6A1-4V alloy. Equiaxed a morphology could be obtained through hot rolling and annealing at 800℃ while a lamellar structure was produced only by solution treatment followed by annealing without hot rolling. The morphology change from lamellar a to equiaxed a was Promoted with increasing the degree of deformation. Thermome chanical processing above β transus temperature resulted in the combined structure of serrated α, acicular a and fine lamellar structure. It was also found that prolonged annealing could induce the formation of egaiaxed α at highly stressed area. Hardness appeared to be higher in lamellar a structure than equiaxed a structure.

The Effects of Daily Melatonin Gavage on Reproductive Activity in the Male Syrian Hamsters

Jeon, Geon Hyung,Kim, Hyeon Jeong,Park, Jinsoo,Lee, Sung-Ho,Cheon, Yong-Pil,Choi, Donchan The Korean Society of Developmental Biology 2020 발생과 생식 Vol.24 No.4

The proper administration of melatonin has well been documented to induce testicular regression in seasonal breeding animals. The subcutaneous injections of melatonin in the afternoon, not in the morning, consistently occurred testicular involution in the male Syrian (golden) hamsters whose reproductive activity is regulated by the photoperiod. But the effects of daily melatonin via gavage have not been estimated. Golden hamsters housed in long photoperiod (LP) were divided into 5 groups: the control animals housed in LP or in short photoperiod (SP) and animals treated daily with low (15 ㎍), middle (150 ㎍), and high dosages (1,500 ㎍) of pure melatonin by using gavage in the evening for 8 weeks. As results, LP control animals had large testes and SP controls displayed small and entirely regressed testes. The animals treated with various dosages of melatonin showed collectively degenerating effects on the weights of testes, epididymides, and seminal vesicles in the middle and high dosage groups, with the individual differences as well. The high dosages induced testicular regression in more proportion than the middle dosages did. The low dosage had large testes like the LP control animals. The small and inactive testes shown in some animals of both middle and high groups presented the complete regression as those of the animals maintained in SP. These results strongly suggest that the administrations of melatonin lead to testicular involution in the male golden hamsters when it is administered through gavage.

Blood-Testis Barrier and Sperm Delayed in the Cauda Epididymis of the Reproductively Regressed Syrian Hamsters

Jeon, Geon Hyung,Lee, Sung-Ho,Cheon, Yong-Pil,Choi, Donchan The Korean Society of Developmental Biology 2021 발생과 생식 Vol.25 No.1

The Syrian (golden) hamsters are seasonal breeders whose reproductive functions are active in summer and inactive in winter. In experimental facility mimicking winter climate, short photoperiod (SP) induces gonadal regression. The blood-testis barrier (BTB) of the sexually involuted animals have been reported to be permeable, allowing developing germ cells to be engulfed or sloughed off the epithelium of the seminiferous tubules. The expressions of genes related to the tight junction composing of BTB were investigated in the reproductive active and inactive testes. Claudin-11, occludin, and junctional adhesion molecule (JAM) were definitely expressed in the active testes but not discernably detected in the inactive testes. And spermatozoa (sperm) were observed in the whole lengths of epididymides in the active testes. They were witnessed in only cauda region of the epididymides but not in caput and corpus regions in animals with the inactive testes. The results imply that the disorganization of BTB is associated with the testicular regression. The developing germ cells are swallowed into the Sertoli cells or travel into the lumen, as supported by the presence of the sperm delayed in the last region of the epididymis. These outcomes suggest that both apoptosis and desquamation are the processes that eliminate the germ cells during the regressing stage in the Syrian hamsters.

SuBSENSE를 활용한 건설현장의 움직이는 물체 인식에 관한 연구

전건우(Jeon, Geon-woo),성현우(Seong, Hyeon-woo),최현철(Choi, Hyun-chul),손효주(Son, Hyo-joo),김창완(Kim, Chang-wan) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.1

유전자 알고리즘을 이용한 시간제약 차량경로문제

전건욱(Geon-Wook Jeon),이윤희(Yoon-Hee Lee) 한국산업경영시스템학회 2006 한국산업경영시스템학회지 Vol.29 No.4

The main objective of this study is to find out the shortest path of the vehicle routing problem with time window constraints by using both genetic algorithm and heuristic. Hard time constraints were considered to the vehicle routing problem in this suggested algorithm. Four different heuristic rules, modification process for initial and infeasible solution, 2-opt process, and lag exchange process, were applied to the genetic algorithm in order to both minimize the total distance and improve the loading rate at the same time. This genetic algorithm is compared with the results of existing problems suggested by Solomon. We found better solutions concerning vehicle loading rate and number of vehicles in R-type Solomon’s examples R103 and R106.

자연광의 색온도 주기 재현을 위한 슬라이딩 윈도우 기반 이상치 판정 알고리즘

전건우(Geon Woo Jeon),오승택(Seung Taek Oh),임재현(Jae Hyun Lim) 한국멀티미디어학회 2021 멀티미디어학회논문지 Vol.24 No.1

유전 알고리즘을 이용한 다용량 차량경로문제

전건욱 ( Geon Wook Jeon ) 국방대학교 안보문제연구소 2004 국방연구 Vol.47 No.1

차량경로문제는 지리적으로 분산된 고객에게 재화와 서비스를 효율적으로 수송 및 배송하는 차량 할당 및 운행 경로를 결정하는 문제이며 우편 시스템, 택배 시스템, 제품사후 서비스 시스템, 물류유통 시스템 및 군 수송 분야 등 다양한 분야에 적용이 가능하다. 일반적인 차량경로문제의 목표는 가용 차량의 대수와 적재용량, 수요지점의 수요량 및 차량에 대한 각종 운행조건 등의 제약 조건 하에 운행 거리를 최소화하는 것이며 차량경로문제가 최초 제기된 이후 체약 조건들을 다양화하여 광범위한 연구가 진행되고 있다. 최근에 이르러서는 물류와 관련한 수송비 절감의 필요성에 대한 인식으로 그 중요성을 더해 가고 있는 실정이다. 일반적인 차량경로문제는 차량의 적재 용량과 차량대수, 운행거리의 제약 조건 하에 적재용량이 동일한 다수의 차량을 이용하여 차량의 총 운행거리를 최소화하는 문체를 다루고 있다. 해법에 있어 차량경로문제는 최적해 산출시 매우 많은 계산량을 필요로 하므로 일반 최적기법의 적용이 곤란하나, 본 연구에서는 단일 창고에서 각 수요지점의 수요량을 충족시킨 후 다시 창고로 되돌아오는 차량에 대해 운행경로를 최소화하는 수리모형의 구축과 이에 대한 해법으로 기존의 유전자 표현을 일부 수정하고 차량 적재용량을 다양화한 다용량 차량경로문제의 새로운 발견적 알고리즘을 제시한다. 다용량 차량경로문제는 기존 연구에 비해 현실성을 고려한 것으로 상위수준의 발견적 기법 중 하나인 유전 알고리즘을 적용하여 최적해를 산출함으로써 유전자 표현의 효율적인 구성이 최적해 산출에 미치는 영향을 관찰하였다. The primary idea of vehicle routing problem is to transport goods or services efficiently to the customers. The main objective is to minimize total service distance and transportation cost with identical vehicles under the following constraints, number of available vehicles, loading capacity, and service distance. And more extensive works by manipulation of these constraints are currently studying so far. Vehicle routing problem can be applied for the various areas such as post delivery, home delivery system, distribution center, and military transportation etc. A modified genetic algorithm, an efficient gene representation which assigns each vehicle to the demand point, with various capacities for each vehicle is suggested in this study. An example with twenty demand points and six different vehicles is provided and analyzed an optimal solution.