전력선 채널에서의 DS/SSMA BPSK 코릴레이션 수신기 성능에 관한 연구

강병권,조창길,조관,이재경,황금찬,Kang, Byeong-Kwon,Cho, Chang-Gil,Cho, Kwan,Lee, Jae-Kyeong,Whang, Keum-Chan 한국통신학회 1992 韓國通信學會論文誌 Vol.17 No.9

본 논문에서는 전력선 채널에서 DS/SSMA BPSK 통신 시스템의 전형 및 하드리미팅 상관 수신기의 성능을 분석하였다. Chan의 잡음 모델을 이용하여 전력전에서 발생하는 강한 임펄스성 잡음을 배경 잡음에 대한 임펄스성 잡음의 전력 스펙트럼 밀도비 $(N_1/N_b)$, 데이터 폭에 대한 임펄스성 잡음 폭의 비(f). 임펄스성 잡음의 발생주기에 대한 임펄스 잡음 폭 (DF)등의 파라미터로 모델링하여, 각 파라미터 변화에 따른 시스템의 성능을 분석하고, 다중접속 간섭 잡음을 가우시안 근사화하여 각 수신기의 다중접속 능력을 평가하였다. 분석 결과 $N_1/N_b$가 작고 f가 1에 가까운 경우 전형 상관 수신기의 성능이 더 우수했으나, $N_1/N_b$가 증가함에 따라 하드리미팅 상관 수신기가 비트 오율 및 다중 접속 능력면에서 전형 상관 수신기보다 더 우수한 성능을 나타냈다. In this paper, the performance of linear and hard-limiting correlation receivers for DS/SSMA BPSK power line communication system is analyzed. Strong impulsive noise of power line is modeled with Chan's noise model, and the performance of both receivers is analyzed in terms of parameters such as ratio of power spectrum density of impulsive noise to that background noise, ratio in impulsive noise width th that of data bit, and interarrival time of impulsive noise. And also multiple access capacity is evaluated with Gaussian approximation of multiple access interference. The results of this analysis reveal that the performance of linear correlation receiver is superior to that of hard-limiting correlation receiver when $N_1/N_b$ is small and is close to 1. But the BER and the multiple access capacity of hard-limiting correlation receiver becomes better in comparison with linear correlation receiver as $N_1/N_b$ increases.

CR-39 플라스틱飛跡檢出器에 의한 ^7Li(p, ^4He)^4He 核反應의 斷面積 測定

姜榮浩,安燦基,金道聖 慶北大學校 物理化學硏究所 1984 硏究論文集 Vol.5 No.-

The Li(p, ^4He)^4He reaction is used for in searches of universal abundance of Li, nuclear energy states of ^8Be, and the final step of p-p fusion cycle. In this work, we have detected and identified ^3He and ^4He from the ^6Li(p, ^3He)^4He reaction and ^4He from the ^7Li(p, ^4He)^4He reaction by the energy dependence of the etch pit diameter of the chemically etched tracks in CR-39. The target was 12㎍/㎠ thin film of natural lithium evaporated on the 10㎍/㎠ carbon backing. The target thickness was measured by Rutherford scattering of proton particles. For proton energies between 148keV and 462keV, differential cross section, angular distribution, and total cross section were measured. The results were compared with the previous measurements and Gamow-Diagram.

敎養課程으로서의 「人口와 未來」開設 및 運營에 관한 實驗硏究 : 梨花女子大學校를 中心으로

康宇哲,徐洸善,田贊和,金在恩,蘇興烈 이화여자대학교 한국문화연구원 1979 韓國文化硏究院 論叢 Vol.33 No.-

This is a research report of the research that led to the opening of a population education course at Ewha Womans University. The research itself may be divided into the following four parts: planning for the research ; preparatory work for a population education course; opening of a population course; and evaluation of the population course. In the first stage of the research, the work, as usual, consisted of organizing the research team, setting up the research objectives, planning the research schedule, etc. The project began in the Fall of 1974, and concluded in the Fall of 1978. In the second stage of the research, the work was carried out for the preparation of a course in population education. Several sessions of faculty conference, in which more than 40 professors from various fields of specialization participated, were held in order to determine the specific objectives of the proposed course, to draw up a syllabus, and to prepare for a textbook for the course. When a rough sketch of the syllabus, and the contents of the course was made a student group was organized to examine and evaluate it. In the third stage of the research, a population education course titled "Population and Future" was opened as an elective course in the general education curriculum. This was in the Fall of 1875, and the course remained open every semester until now. An anthology with the same title as the course itself was used for reading, and the teaching was carried out as a team teaching by a team of 6-9 professors. In the fourth stage of the research, an evaluative study was taken up in order to evaluate the course with regard to its structure, textbook, teaching method, and its contents, as well as to assess the effectiveness of the course on terms of the students' change in their cognitive and emotive or attitudinal response to population problem.

단음절 합성단위음을 사용한 시간영역에서의 한국어 연속음 규칙합성에 관한 연구

강찬희,안영화 江南大學校産學技術硏究所 2004 산학기술연구소논문집 Vol.- No.18

본 논문은 시간영역에서의 한국어 연속음 규칙합성에 관한 실험적 연구결과이다. 특히, 단음절 단위음을 사용하여 연속음을 합성할 경우 음절간의 피치 불연속성으로 인한 자연성 및 음질이 저하되는 현상을 개선하고자 하였다. 이를 위하여 자연음으로부터 추출한 구문 단위의 피치 패턴을 보간법으로 생성시켜 합성하는 방법을 제안하였다. 중심주파수가 80, 118, 140, 170, 200Hz인 5가지 유형의 피치 패턴을 2음절어 및 3음절어에 각각 부여하여 합성시킨 합성음에 대한 MOS평가를 수행한 결과를 제시하였다. 실험결과, 제안한 시간영역에서의 합성방식에 의한 합성음의 음질은 명료하고 자연스러웠으며, 간단한 문장단위의 연속음 합성이 가능하였다. 운율요소의 제어결과는 지속시간(장단)과 악센트(강약)와 피치주기(억양) 및 에너지 패턴의 제어도 시간영역에서 가능하였다.

CR-39 플라스틱飛跡檢出器에 의한 ^7Li(p, ^4He)^4He 核反應의 斷面積 測定

姜榮浩,安燦基,金道聖 慶北大學校 1984 論文集 Vol.37 No.-

The ^7Li(p,^4He)^4He reaction is used for in searches of universal abundance of Li, nuclear energy stages of ^8Be, and final step of p-p fusion cycle. In this work, we have detected and identified ^3He and ^4He from the ^6Li(p,^3He)^4He reaction and ^4He from the ^7Li(p,^4He)^4He reaction by the energy dependence of the etch pit diameter of the chemically etched tracks in CR-39. The target was 12㎍/㎠ thin film of natural lithium evaporated in the 10㎛/㎠ carbon backing. The target thickness was measured by Rutherford scattering of proton particles. For proton energies between 148keV and 462keV, differential cross section, angular distribution, and total cross section were measured. The results were compared with the previous measurements and Gamow-Diagram.

돼지설사 원인균 E. coli의 생육저해에 대한 유산균의 효과

姜國熙,成文喜,方泰瑛,龍球淵,林讚洙 成均館大學校 科學技術硏究所 1985 論文集 Vol.36 No.1

E. coli A_2 diarrhea causing bacteria of pigs was anaerobically inoculated with 10^5/ml into prereduced YS medium (10% reconstituted skim milk+0.1% yeast extract), and then lactic acid bacteria were inoculated with 10^5/ml and 10^7ml into previous inoculated samples of E. coli A_2. Inoculated samples cultured at 37℃, were tested to determine changes in viable numbers of organisms and pH. The experimental results are summerized as follows: 1. In the mixed culture medium of 10^5/ml E. coli A_2 and L. casei YIT9018, E. coli A_2 decreased after 36 hours from incubation. 2. In the mixed culture medium of 10^5/ml E. coli A_2 and L. acidophilus, E. coli A_2 drastically decreased after 24 hours from incubation and was almost disappeared after 72 hours from incubation. 3. In the mixed culture medium of 10^5/ml E. coli A_2 and L. bulgaricus, E. coif A_2 drastically decreased after 24 hours from incubation and was almost disappeared after 72 hours from incubation. 4. In the mixed culture medium of 10^5/ml E. coli A_2 and Str. thermophilus, E. coli A_2 decreased after 12 hours from incubation. 5. When the pH value of the mixed culture, was, 4. 5 below, E. coli A_2 decreased.

Back-Propagation Algorithm 상에서의 성능에 미치는 Parameters 분석에 관한 연구

강수연,박찬호,이현수 慶熙大學校 1994 論文集 Vol.23 No.-

신경망에서 가장 많이 사용되고 있는 알고리즘 중의 하나가 역전파(Back-Propagation) 알고리즘이다. 역전파 알고리즘에서 문제해결에 본질적인 영향을 주는 몇가지 요인들이 존재한다. 본 연구에서는 이 몇가지 요인들이 각각의 응용 문제의 해를 얻는데 미치는 영향을 시뮬레이션 결과를 통해 알아보고 이를 분석및 고찰 하였다. 고려 대상의 요인들로써는 learning rate, momentum, weight 초기값, 은닉 유니트수를 들 수 있다. 응용 문제 대상은 XOR 문제와 8*8 dot alphanumeric font 학습으로 하였다. Back-Propagation is one of algorithms that are currently used in neural network. It has some factors that basically affect on solving problems. On this paper, we analyze and investigate several learning parameters that effect on solutions of each application problems through simulation result. Considered factors are learning rate, momentum, initial weight values and the number of hidden units. Applied problems are XOR learning and 8*8 dot alphanumeric font learning.

生物膜 ?過裝置에 의한 下水處理에 관한 硏究

姜龍太,全裕燦,趙奉衍 東亞大學校 1986 東亞論叢 Vol.23 No.1

This study, through the filtration experiment by biofilm, was explained the operation for each processes in its system, and were investigated the actual(filtration experiment by biofilm) applicational propriety for the existing headloss quation and the correlation of factors. The results of the experiment are the following. 1. When the raw water quality was reached to standars of the treated water quality in about a week, the average removal rates of SS, BOD and COD were 92%, 91% and 74%, respectively. 2. In case that the experimental conditions were water quantity, 0.67㎥/day, BOD 100㎎/ℓ, oxygen absorption efficiency, 16%, air quantity was 15N㎥ and showed high BOD removal rate. 3. The backwashing water quantity was required the twice or the three times of the packed volume. 4. When thd BOD loading was less then 5 ㎏/㎥·day, the BOD removal rate showed more than 95%. 5. The headloss of this experiment was approximated to the value obtained from substiting the filtration Model Ⅰ for the Kang's headloss equation corrected for the Kozeny-Carman's.

空氣拳銃 擊發時 心拍數 變化에 관한 硏究

康燦金 단국대학교 1986 論文集 Vol.20 No.-

The result of investigation into the variation of the number of heart beating. The score rate by points and the point of impact by the position at firing an air rifle for the male shooter of B high school in Seoul has come out as the following. 1. The comparison of the score rate by points. In the a group. There were three who scored more than 20% from the total points 600.In the B group, on the other hand, there was only one. The rate of high gore in an average was in the A group that has many long experienced shooter, and of low score was in the B group. 2. The comparison of the point of inpact by the position. The shooters from A group K.K. N.,L.S.S., made 20%, 25.4% in the direction of 6~7o'clock, P.K.H.l8.3% in 4~5 0'clcrk, L.J.Y.21.7% in 7~8. From the B group, on the other hand, in the same direction of 7~8, K.M.H., H.S.W., K.S.K. made the same direction with 18.6,18.3,23.3%.The reason of uneven formation of the point of impact is the work of the individualities of the shooters. 3. The variation of the number of heart-beating at firing by the score, P.K.M. from the A group had faster heart beating while he was gaining in high score, others' heart beating, on the other hand were irregular. The reason can be interpreted as the shooters were selected without consideration for the synthetic aptitude.

압력센서의 디지털 인터페이스와 신호처리에 관한 연구

강형구,이종호,안광희,이충호,박찬원 江原大學校 産業技術硏究所 1997 産業技術硏究 Vol.17 No.-

A smart pressure measurement system is described, which provides a precise A/D conversion and is highly suitable for communication with microprocessors. In order to avoid unstable problems of remote pressure sensing we have developed a new interface board which performs the A/D conversion and smart signal processing of the measured pressure data Serial communication software which is based on ASCII code commands is also developed to process initial setup an calibration functions as well as multi-drop communication with PC. The test and evaluation of the proposed system has been shown as having the better performance compared to the other types of existing pressure measuring systems and will give good applications to the industrial use where a highly precision remote sensing is needed.