룸머 페이딩 채널에서 길쌈부호를 채용한 BPSK/OFDM 시스템의 성능 분석

김성원,심재옥,김언곤 한밭대학교 산업과학기술연구소 2001 논문집 Vol.5 No.-

In this paper, we have simulated the performance of BPSK/OFDM system with 1/2 convolution coding under AWGN(Additive White Gaussian Noise) Rummler fading channel. The system adapted (2,1,7) convolution encoder as channel coding method, OFDM with subcarrier 64 as modulation technique, and BPSK as mapping method. In the Rummler fading channel, delay time is set 1, original signal is decremented during direct-path signal passing through multipath as factor of this, we changed to value of attenuation of the multipath component.(0.3, 0.6 and 0.9) Then we looked at coding effect of channel coding and decoding method. As a result of simulation, when multipath component is 0.3, 0.6 and 0.9 in the BER=10^-3, we obtained the results that the coding effect of this system is about each 3㏈, 4㏈, and 9㏈ through the coding methods. And then by using soft decision as decoding we method obtained the better performance of each about 2㏈, 3㏈, and 5.5㏈ than hard decision. Also, when BER is 10^-5, we obtained the results that the coding effect of this system are each about 5㏈, 5.5㏈, 10㏈ through the coding methods. And then by using soft decision as decoding method obtained the better performance of each 2.5㏈, 3.5㏈ and 6.5㏈ than hard decision.

터보부호를 채용한 QPSK/OFDM 시스템의 성능 분석

김성원,심재옥,김언곤 한밭대학교 생산기반기술연구소 2002 생산기반기술연구소 논문집 Vol.2 No.1

In this paper, we have simulated the performance of QPSK/OFDM system with 1/3 turbo coding under AWGN(Additive White Gaussian Noise), indoor channel or doppler shift. The system adapted (3,1,4) turbo encoder as channel coding method, OFDM with subcarrier 64 as modulation technique, and QPSK as mapping method. In the doppler shift, we changed to value of doppler frequency 46 ㎐(mobile velocity 10 ㎞/h) and 92 ㎐(mobile velocity 20 ㎞/h). Then we looked at coding effect of channel coding and decoding method. As a result of simulation, in case that the iterative decoding of QPSK/OFDM system adopt turbo encoder in the indoor channel was done about three times, efficiency was demanded about 2.7㏈ when BER is 10^-3 and about 5 ㏈ when BER is 10.3 ㏈. When the doopler frequency is 46 ㎐, efficiency was demanded about 7.9 ㏈ in case that BER is 10^-3 and about 10 ㏈ in case that BER is 10^-5. And when the doppler frequency is 92 ㎐, efficiency was demanded about 17 ㏈ in case that BER is 10^-3 and about 23.7 ㏈ in case that BER is 10^-5. As the doppler frequency is high, in spite of having the high E_b/N_o in the coding gain graph, the error flow whose efficiency wasn't advanced came out.

연합대학으로의 대학 체제 변화에 관한 연구

서재천,서강식,조붕환,지옥화,장원순 공주교육대학교 2010 公州敎大論叢 Vol.47 No.1

본 연구는 교육과학기술부의 경쟁력있는 국립대학을 만들고자 시행하고 있는 여러 정책 중 연합대학으로의 체제 변화 권유에 대한 장단점과 이해득실을 냉철하게 객관적으로 고찰해 보고자 수행되었다. 연구의 수행방법은 연합대학 체제의 추진이나 독자생존의 길 등 의사결정에 참고자료가 될 수 있도록 일본과 미국 등 외국의 연합대학 사례를 중심으로 수집 가능한 자료를 수집하여 고찰한 후 연합대학 체제 추진이나 독자생존의 장단점을 알아보았다. 본 연구의 결과는 여러 가지 외적인 상황 속에서 우리 대학이 독자적으로 생존하는 것이 가능한가, 또는 결국에는 독자적 생존의 대안으로 연합 내지는 통합의 길을 선택할 수밖에 없는가 하는 것은 그 누구도 쉽게 예단하기 어렵다는 것이다. 그러나 대학 구성원들이 미래를 선택하지 않는다 하더라도 외적인 요인에 의해 미래가 결정될 여지가 있으므로 지금부터라도 대학의 미래에 관한 공동의 지혜를 모아야 할 것으로 생각한다. 함께 머리를 맞대고 허심탄회하게 서로의 의견을 존중하며 서로에 대한 불신을 털어버리고 진정 대학의 미래를 위한 바른 선택이 무엇인가에 관한 논의와 연구가 꾸준하게 지속되어야 할 것으로 판단된다. This study was carried out in order to try to consider objectively merits and demerits regarding a system change invitation toward the Union University System and understanding gains and losses during a lot of policies to make a national college that there was competitiveness of Ministry of Education, Science and Technology of education. The results of this study is that no one is easy to predict, that it does as alternatives of an independent survival or select a street of integration and the Union University System in various external situations, finally. However, the University members does not select the future even if in various external factor because there is no doubt that the future will be decided from now on any University in the future regarding collaborative wisdom of the university, We thought it was going to do. Head with open-minded to respect each other's opinions and distrust each other confide you discard the truly University for the future, select the right to discuss and research can be sustained.

의류제품 구매에 있어서 유통채널갈등과 가격단서 지각

양원정;서민정;박재옥;이규혜 한양대학교 2006 韓國 生活 科學 硏究 Vol.26 No.2

Differentiated On Off line channel strategies are getting more attention due to conflicts between Off line channel and active E commerce. Choosing an appropriate channel strategy can prevent apparel products from clashing in market and manage each channel more efficiently. In fashion industry, product prices are flexible because of the short product life cycle and different distribution channels. It is essential to understand consumers’ apparel price cue perception when purchasing apparel in both On line and Off line. The objectives of this study was to examine the effects of apparel price cues on perceived savings and purchase intention in On line versus Off line retail channel. 303 quetionnaires from internet experienced women were used for the data analysis. Statistical analyses employed in this study were descriptive statistics, reliabilities conjoint analysis and regression. Overall, the perceived importance of apparel price cues were different between On line and Off line channels and each apparel price cue affected perceived savings and purchase intention differently according to distribution channels. Therefore, by considering characteristics of apparel price cue in On line versus Off line channels, differentiated channel strategies should be imposed to implement more effective marketing strategies.

이면성 및 도플러 심초음파도를 이용하여 진단한 선천성 거대 좌회선지-좌심실 관동맥루

진승원,박준철,이영중,유병현,박현옥,김용주,윤호중,김재형,홍순조,최규보,권종범,원용순,박건 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

경량건축 자재에 관한 연구 : 화산분출물-Fly ash-수재계의 기포콘크리트에 관하여 On manufacturing cellular concretes with volcanoc ejects-fly ash-granulated slag systems

배원태,신현택,장재욱,박종옥 국립 경상대학교 공과대학 부설 첨단소재연구소 1993 尖端素材 Vol.3 No.-

이 연구는 화산 분출물(스코리아 또는 송지암)-Fly ash- 슬래그 시멘트계의 경량콘크리트에 관한 실험실적인 연구이다. 발포제로서 Al분말을 사용하였고, 고압수열 양생조건은 185℃-13hrs.이다. 이 연구에서 경화체의 성질은 부피비중, 겉보기 밀도, 겉보기 비중, 흡수율, 압축강도, 꺽임강도, 열전도율, 미세조직 관찰 및 생성물을 구명하였다. 최고 압축강도를 갖는 기포콘크리트는 41kg/㎠이었고 그배합비는 화산분출물(scolia) : 플라이 애쉬 : 슬래그 시멘트 : 석고 =15 : 5 : 79 : 1이었다. 미세구조관찰에서 크고 작은 풀입상의 결정을 보여주었다. 이때의 강도중진에 기여하는 β-C₂S, CSH 와 11Å tobermorite 이었다. This paper deals with the experimental investigation for manufacturing the lightweight building materials with volcanic ejecta -fly ash-portland slag cement. Alumina powder was added an aerating agent. Autoclaving condition was 185℃-13hr. These properties studied by means of bulk density, apparent density, apparent porosity, water absorption, compressive strength, modulus of rupture, thermal conductivity, S.E.M. and X-ray diffraction analysis. The cellular concrete with maximum compressive strength, 41Kg/㎠, was obtained by volcanic ejecta(scolia)-fly ash -portland slag cement : gypsum-15 : 5 : 79 : 1. The shape of specimens showed small of large size thin long grassleafs. In this case of autoclave curing, hydration product were β-C₂S, CSH and and 11Å tobermorite, which were considered to the increase of strength.

외과적 악교정술을 위한 두부방사선학 계측 기준치

성재현,성정옥,경희문,권오원 대한치과교정학회 1989 대한치과교정학회지 Vol.19 No.1

The purpose of this study was to establish Korean normas that will be valuable aids for diagnosis in orthognathic surgery patients. Lateral cephalometric measurements were established for adult Koreans (60 males, 62 females) with normal occlusion and acceptable profiles. The results were as follows: 1. Means, standard deviation and sexual differentiation were included within each measurement. 2. In skeletal mesurements, FH to SN and SN to mandibular plane measurements in females were larger than those in males while all linear measurements in males were larger than those in males were larger than those in females. 3. Significant differences were observed between male and female groups on all of the items that showed vertical relationship in dental measurments. And the measurements of ADH, PDH and overbite in males were larger than those in females while the measurements of incisor exposure in females were larger than those in males. 4. In all measurements of soft tissue except NLA, that is, of FCA, UFH, ULL and LLL, males were larger than those in females.

자기 배양 골모세포를 이용한 임상적용례 : 증례보고 Case Report

김석중,옥인영,장정호,김용식,장재덕,박원종,이주형 대한골절학회 2004 대한골절학회지 Vol.17 No.2

간세포암종에 대한 간동맥 화학색전술 후 발생한 급성호흡곤란증후군

조윤원,이정미,최자윤,유동훈,차라리,오혜원,김홍준,민현주,김현진,정운태,이옥재,하창윤,이선영 이화여자대학교 의과학연구소 2013 EMJ (Ewha medical journal) Vol.36 No.1

Transcatheter arterial chemoembolization (TACE) has become an effective alternative treatment strategy for patients with inoperable hepatocellular carcinoma (HCC). Although TACE is relatively safe, acute respiratory distress syndrome associated with pulmonary lipiodol embolism is a rare and potentially fatal complication. We report a rare case of acute respiratory distress syndrome after TACE for inoperable HCC. A 75-year-old man, with huge HCC in right lobe, was treated by TACE for the first time. Seven hours after uneventful TACE procedure, he felt dyspneic and his oxygen saturation recorded by pulse oximetry (SpO2) fell to 80% despite of applying non-rebreathing mask. He underwent mechanical ventilation with a protective ventilatory strategy. We experienced a case of acute respiratory distress syndrome after TACE for HCC.

性別 및 年齡에 따른 體格과 體力의 特性과 變化에 關한 縱斷的 硏究Ⅱ : Emphasised on College Men of Department of Physical Education 體育專功 大學生을 中心으로

金尙國,姜東洹,張周鎬,金昇一,徐再均,金耕知,孫斗玉,鮮于攝,崔榮烈,尹宇相,金亨燉,方永鎭,朴英震,柳在忠 慶熙大學校 體育科學大學 1989 體育科學論叢 Vol.- No.2

The purpose of this study was to compare the characteristics, change in physique and physical function of college students majoring physical education and Taekwondo (454 males and 64 females of age groups ranging from 18 to 26). The results are as following: 1. The male group of 23yrs old in physical education showed highest values in 7 items(Weight, Chest Girth, Fore Arm Girth, Thigh Girth, Calf Girth, Scapular Skinfold Thickness and Suprailiac Skinfold Thickness). 2. In the Physical function, the male group of 18yrs old showed highest values in Power, Flexibility, and then 21yrs old at Back Strength, Vital Capacity, and 23yrs old at Grip Strength, and 25yrs old at Blood Pressure, respectively. 3. In the physique, the male group of 22yrs old showed highest values in Weight, Chest Girth, Thigh Girth, Calf Girth, and then 24yrs old Upper Arm Girth, Fore Arm Girth, and 19yrs old at Height, Upper Limb Length, respectively. 4. In Physical Function, the 22yrs old showed highest values in Back Strength, Vital Capacity, and then 23yrs old at Side Step, Trunk Extension, but 18yrs old showed lower Values in Grip Strength, Side Step, Vital Capacity and Blood Pressure. 5. The female group of 22yrs old showed highest values in 8 items(Height, Sitting Height, Waist Girth, Upper Limb Length, Lower Limb Length, Skinfold Thickness), and then 18yrs old at 5 items (Weight, Upper Arm Girth, Fore Arm Girth, Thigh Girth, Calf Girth), respectively. 6. In the physical function, the 22yrs old showed highest Values in Grip strength, Back Strength, Power, 5 Minute Run, and 18yrs old at flexibility, Harvard Step Test, respectively. 7. In the change of the physique for two years(1988-1989) in the male group, majoring Physical education the 22yrs old showed increase in 4 items, and the 20yrs old in 3 items, but 18yrs old showed decrease in 3 items. 8. In the change of the physical function for two years in the male group, the 20yrs old showed increase in 4 items, and the 21, 25, 26yrs old in 3 items, but the 19yrs old showed decrease in 6 items, and 18, 22 yrs old in 5 items, respectively. 9. The change of the physique for two years in all female group, of 18, 19, 20, 21yrs old showed increase in 11 items except Skinfold Thickness. 10. In the change of physical function for two years in female group, the 18yrs old showed increase in 3 items, and then 20yrs old in 5 items, but 19, 22yrs old decreased 12 items, respectively. 11. The highest significant difference in physique between male and female was found in weight(mean Value 17.5%), and the lowest difference was found Thigh Girth, Calf Girth(1,3%), Upper Limb Length, Lower Limb Length(2.5%). 12. The Highest difference in physical function was Strength (mean Value 40%), Vital Capacity (33%), Power(22%), but Lower Trunk Flexion, Foot Balance(3.4%). 13. In the difference of Physique and physical function between physical education major and taekwondo major, the physical education showed higher values in skinfold Thickines (mean Value 16.5%), Weight, Waist Girth(4.7%) and Strength(33%), Endurance(5.6%), but subjects majoring Taekwondo showed higher values in Flexibility and Foot Balance. 14. In all male groups, Waist Girth, Scapular Skinfold Thickness, Back Strength, Sargent Jump, Trunk Extension and Diastolic Blood Pressure were showed a significantly related at 0.001 level.