CDMA 시스템의 시뮬레이션 프로그램 구현 및 이를 이용한 전력 제어 분석

장우영,장태정 강원대학교 정보통신연구소 2002 정보통신논문지 Vol.6 No.-

Recently, CDMA system has been widely used in wireless communication systems. Since all the signal shares a frequency band and is discriminated from each other by code, the reverse link power control is very important to improve the communication quality and to increase the system capacity. In this paper, a program was constructed by using Matlab to simulate and analyze the power control in CDMA systems based SIR(Signal to Interference Ratio). Through simulations by using the program, we observed some known characteristics of the power control and the capacity of a CDMA system. We also found that for a new active user, one step jump command to average received power of current active users in the cell as the first target power command in the reverse link of the new user, instead of 1 dB step size as given in IS-95(a), can greatly reduce the stabilizing time in power control.

뇌 심혈관계 관련질환 유소견 근로자들의 의료이용에 관한 연구

최태성,유재영,김진석,장은철,박주언,우극현 순천향의학연구소 2006 Journal of Soonchunhyang Medical Science Vol.12 No.2

..

CW Nd:YAG레이저를 이용한 금형 재료의 표면열처리

유영태,신호준,장우양 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.5

Laser heat treatment is an effective technique used to improve the tribological properties and also to increase the service life of automobile components such as camshafts, crankshatfs, lorry brake drums and gears. High power CO₂ lasers and Nd:YAG lasers are employed for localized hardening of materials and hence are of potential application in the automobile industries. The heat is conducted rapidly into the bulk of the specimen causing self-quenching action to occur and the formation of matrensitic structure. In this investigation, the microstructrual features occurring in Nd:YAG laser hardening SM45C and STD_(11) steel are discussed with the use of optical microscopic and scanning electron microscopic analysis. Moreover, This paper describes the optimisation of the processing parameters for maximum hardened depth of SM45C and STD_(11) steel specimens of 10mm thickness by using CW:YAG laser.

충남지역 나환자에 대한 사회의학적 조사연구

박연우,오장균,이태용,심운택 충남대학교 의과대학 지역사회의학연구소 1990 충남의대잡지 Vol.17 No.2

We studied through February 1989 to August 1989 to investigate the demographic characteristics, disease status and deformity of leprosy patients registered at Chungnam provincial area on December 31, 1988. The results were as follows: 1. Older than 40 years of age occupied 83.3%, and most patients lived at his or her own home as farmer or stock breeder. 2. The infection source was more the extrafamilial than the intrafamilial source and the most common initial symptoms and signs by body site were sensory paralysis on extremities and infiltration on face and macule on trunk. 3. The deformity was higher in male than female, older the age and much more the deformity. 4. The deformity was higher in T type than L type, and more recent onset of disease and shorter the duration between the onset and the register of disease, more lighter the deformity. The settlement villiger than domiciliary and the group of patientnts being treated at health center than leprosy association, the deformity was heavier.

이중구조 촉매전극을 이용한 알칼리 연료전지에 관한 연구

노용우,이태희,설용건,장의종,김경림 연세대학교 산업기술연구소 1990 논문집 Vol.22 No.1

An experimental low-temperature low-pressure hydrogen-oxygen alkali fuel cell was constructed and its performance was tested for various operating conditions. Hydrogen was used for fuel and oxygen was used for oxidant and KOH solution was used for electrolyte. Both electrodes for hydrogen and oxygen were prepared by the same method and the materials used were carbonyl nickel and ammonium bicarbonate. Experimental results show that maximum current density of 8.91 mA/㎠ was obtained at 40℃ wt% KOH solution and optimum power was 1.74 mW/㎠ at 6.43 mA/㎠ current density.

디지탈 시냅스의 구현에 관한 연구

朴仁政,張虎聲,李天雨,金泰亨 단국대학교 1993 論文集 Vol.27 No.-

The conventional computer has the excellent performances in data management and numerical calculation, but it has reached limitation in a field of parallel processing such as image and speech processing. Neural networks have been studied in order to overcome this limitation. Recently, neural processor has been developed up to the level of the chip. Neural networks are composed of the connection of unit cells which have functions of multiplication, addition and transformation. In this paper a neural network is designed in digital method which easily adjusts weights and fabricated with an EPLD device.

2.5-헥산디온에 노출된 근로자에게서 발생한 말초 신경병증

조성용,장용석,최은경,김진석,유재영,우극현,최태성 대한산업의학회 2007 대한직업환경의학회지 Vol.19 No.1

목적: 영상음향장비 제조업체에서 2,5-헥산디온을 취급한 근로자에게서 발생한 다발성 말초 신경병증 환례를 보고하고, 동일 공정근로자들의 말초 신경기능을 조사하고 자 한다. 방법: 환례에 대해 방사선학적 검사, 소변 및 혈액 검사, 신경전달속도 검사, 작업환경 측정을 하였으며, 2,5-헥산디온의 노출을 중단시킨 후 5개월 후에 다시 신경전달속도 검사를 하였다. 동일공정 근로자들의 영향평가에서는 2,5-헥산디온에 노출된 13명의 남자 근로자를 노출 군으로, 해당 물질에 노출된 적이 없는 5명의 남자 근로자를 비노출군으로 선정하여 검사를 하였다. 결과: 환례의 신경전도 검사결과 양측 척골신경과 정중 신경에 이상소견을 보였으며, 호전여부를 관찰하기 위하여 5개월 후 추적검사를 실시한 결과 증상 및 신경전달속도 검사결과가 호전되었다. 동일공정 근로자들의 영향평가에서 노출군의 정중 신경과 척골신경이 비노출군에 비하여 유의하게 감소되어 있었다. 감각 신경의 진폭의 경우, 노출군의 정중 신경과 비복 신경이 감소되었으며, 운동 신경 전도속도에서는 노출군의 비골신경이 유의하게 감소되어 있었다. 말단 잠복기에서는 노출군의 정중신경, 척골신경, 비골신경, 경골신경이 비노출군에 비해서 유의하게 연장되어 있었다. 결론: 환례의 증상과 신경전달속도 검사의 이상소견은 2,5-헥산디온에 의한 말초신경병증에 부합되었다. 동일공정 근로자 건강영향평가에서 신경전달속도 검사결과 노출 군과 비노출군간의 유의한 차이가 있었는데, 이를 통해 2,5-헥산디온이 근로자들의 신경독성에 영향을 줄 수 있다는 것을 확인할 수가 있었다. Objectives: This study is a case report of 2,5-hexanedione induced occupational peripheral polyneuropathy. We also investigated the peripheral nerve function of all workers who had been exposed to 2,5-hexanedione in the same process. Methods: In June, 2006, a 2,5-hexanedione exposed worker complained of both hand numbness. He received neurologic, radiologic, laboratorial and electrophysiologic evaluation, including measurements of workplace environment. Five months after cessation of exposure to 2,5-hexanedione, a follow-up electrophysiologic examination was done. We evaluated the peripheral nerve function of 2,5-hexanedione exposed workers by comparing 13 male 2,5-hexanedione exposed workers who were in same company with the patient and 5 male workers who had not been exposed to 2,5-hexanedione. Results: Under electrophysiologic examination, there were abnormalities in sensory and motor nerve velocity, terminal latency, and F-latency of both median nerve and ulnar nerve. After 5 months, the patient symptoms and the results of follow-up electrophysiologic examinations were improved. Comparing the 2,5-hexanedione exposed group with the unexposed group, the sensory nerve velocity of the median and ulnar nerves in the exposed group was decreased. The motor nerve velocity of the peroneal nerve, and sensory nerve velocity of the median and sural nerves were decreased. Terminal latency of median, ulnar, peroneal, and tibial nerves in the exposed group were increased compared with the unexposed group(<0.05). Conclusions: 2.5-hexandione can induce peripheral polyneuropathy in male workers.

양극성 장애와 Monocyte Chemoattractant Protein-1 유전자 다형성

배치운,김태석,장우영,김정진,이창욱,이수정,전태연,이철,백인호 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.5

Objectives : Several studies suggested that cytokines could be involved in the pathogenesis of mood disorders, while data for bipolar disorder is relatively deficient (BD). BD, Knowned to have a inherited tendency, has been considered to be related with T-helper cell system. This study was designed to investigate the association between polymorphism of monocyte chemoattractant protein-1 (MCP1) gene at promoter-2518 and BD. Methods : Patients with BD (n=92) in accordance with DSM-FV criteria and control subjects (n=114) participated in this study. DNA was extracted from whole blood and the MCP-1 gene promoter region was amplified by polymerase chain reaction-based method. Results : Genotype and allele distributions in patients with BD were not different from those of control subjects (p=0.587 ; p=0.384). Genotype and allele distributions in accordance to presence or absence of suicide attempt (p=0.423), family history (p=0.733) and psychotic feature (p=0.436) were not different between the two groups. Conclusion : Present study suggests that the MCP1 promoter -2518 polymorphism may not affect the susceptibility and clinical diversity of the development of BD.

最大酸素攝取量에 의한 運動 後의 心博數 恢復率에 關한 硏究

趙庚旭,金泰完,張鳳愚,金奎鎭,金榮男 忠北大學校 平生體育硏究所 1985 平生體育硏究所 論文集 Vol.1 No.-

The purpose of this study is to research the relative effectiviness of heart rate of recovery after exercise and the estimated maximal oxygen uptake by physical work capacity. The subjects of this study were 22 conditioned non-athletes in Chung Buk University. The result of the measurement is summarized as follows : 1. The percentage of the increase of heart rate during work loads is 13% higher in second work load than in the first work load and is 9% higher in the second work load than in the third work load. 2. The percentage of heart rate of recovery after exercise by physical work capacity shows recovery of 23.8% at 30 seconds and of 82.3% at 300 seconds. 3. The relationship between heart rate of recovery and maximal oxygen uptake is r≒0.4∼0.6 except at 30 seconds.

PWC170의 算出方法 評價에 關한 硏究

趙庚旭,金泰完,張鳳愚,張鍾仁 忠北大學校 平生體育硏究所 1985 平生體育硏究所 論文集 Vol.1 No.-

The purpose of this study is to estimate the maximal oxygen up-take and the physical work capacity by four experimental methods in PWC170. The subjects of this study start to pedal the bicycle ergometer at the three work loads; the first work rate with 450∼600kpm/min, the second work rate with 600∼750kpm/min, and the third work rate with 750∼900kpm/min. Each exercise bout is 6 minutes long. We used a pedal frequency of 50 revolutions per minute. The first method is the first and second work rates the second method the second and the third work rates the third method the first second and hird work rates and the fourth method an integration by the third work rate. We measured and recorded the heart rate during the last 30 seconds of every minute of exercise. Since the subjects worked in a steady state, it is not necessary that they should exercise exactly 6 minutes each time. If problems happened during the taking of heart rate or other data, we continued to exercise another 30 to 60 second. The estimation of maximal oxygen uptake and physical work capacity was conducted by work loads and heart rates during exercise. The results are as follows: 1. The estimation by four different, methods showed 2∼3 persentile difference in maximal oxygen uptake(1min, ml/kg/min) and PWC170(kpm/min, kpm/kg/min). 2. The estimation by four different methods did not show significant differene, therefore for the estimation we had better use simplified method for the first work rate and the second work rate.