칼라 브라운관의 장수명 산화물 캐소드 개발에 관한 연구

조현식 울산대학교 1997 국내석사

ISM용 S-대역 2단 저잡음 증폭기의 설계 및 제작에 관한 연구

조현식 木浦海洋大學校 大學院 2004 국내석사

The LNA(Low Noise Amplifier) is one of the most important building blocks in S-band Receiver System for ISM. It determines the noise figure and input VSWR of the overall system. Because the weak signal of the first block is fed from a antenna meets LNA. Therefore, we has designed and fabricated to the two stage LNA for ISM in S-band. Generally, a noise figure of two stage LNA is relied upon the first stage. Thus considering this specific, we has designed a two stage LNA with high gain and a little affection of noise figure. As Design LNA, after considering the stability of aF chip that must be designed a matching circuit to harmonize with specification. Generally circumstances of LNA, is equal to of input matching circuit. In the matching condition, the quality of noise figure is come to good, while the gain and input VSWR of amplifier could be bad. Therefore in this paper, the LNA has designed consider with noise figure and gain that trade off the point in noise circle and gain circle. When we design a two stage LNA, the first stage is regarded to good noise figure and low gain. The second stage has designed to a high gain amplifier using gain matching methode. The Protype of this study has using the AT54143 HEMT chip of HP company. Besides the circuits design of LNA has used ADS simulation tools. Results of simulation has shown to gain of 30dB, noise figure of 0.6dB and input-output reflection coefficient of less than -18dB. For the completion of simulation, which is fabricated substrate of Tacking RF35 with perceptivity 3.5, thickness 20mil. It has measured with network analyzer 8510C of HP company. Results to measurement of prototype be obtained to gain of 27.5dB, input reflection of -21dB and output reflection of -l8dB.

연봉제 인식 정도가 직무 만족과 조직 몰입에 미치는 영향

조현식 안동대학교 대학원 2005 국내석사

부동산거래사고의 저감을 위한 법·제도적 개선 실증연구

조현식 동의대학교 대학원 2016 국내박사

Opial條件을 갖는 Banach空間에 있어서 漸近的非擴大寫像에 關한 反復數列의 漸近的擧動

조현식 부산수산대학교 1987 국내석사

불평형 계통과 비선형 부하에서도 강건한 3상 새그 보상기 해석 및 설계

조현식 忠南大學校 大學院 2013 국내석사

This thesis proposes a design of three-phase sag voltage compensator, which protects a critical load from grid voltage sag. The thesis presents an algorithm and design of 3-phase voltage compensator. Three-phase voltage sag compensator is able to compensate for input voltage sag or interruption and provides a secured electric power to the critical loads such as computers, automation equipment, and communications equipment. Compensator algorithm consists of a super capacitor bank charging method, 3-phase voltage sag detection, bidirectional thyrister commutation method and inverter output voltage control. In this paper, modified all-pass filter (MAPF) based method and instantaneous value comparison method are used in a hybrid manner. The compensator detects a voltage sag or interruption within 2-msec and provides the rated voltage from supercapacitor bank to load. When the sag occurs, compensator blocks bidirectional thyristor operation signal and generates output voltage to commutate the thyristor's. And then compensator supplies a required power to the critical loads continuously. Fundamental component of output voltage is regulated by synchronous reference frame PI control. The PI control shows good performance in the linear load, but low order harmonics are generated in the nonlinear load. To provide clean sinusoidal voltage even in the nonlinear load, a selective harmonic elimination method is proposed and added to the synchronous reference frame PI control in the parallel path. By using the method, THD less than 5% is achieved in the linear and nonlinear load. The feasibility of the proposed methods is verified through simulation and experiments with a 10kW prototype of three-phase voltage sag compensator.

운동교육 프로그램이 뇌성마비 아동의 대 소근육 및 감각 운동 기능에 미치는 효과

조현식 대구대학교 2002 국내석사

The purposes of this study were as follows: First, it was find out any difference between visually impaired children and sighted children in terms of self-esteem and fostering attitude. Second, it was find out self-esteem and fostering attitude were different, depending on variables of the children such as sex, grade at school, residential district, and parent. Third, it was find out self-esteem and fostering attitude were different, depending on characteristics of visually impaired children such as degree of visually impaired, type of residence, time of visually impaired. 122 of visually impaired children and 157 of sighted children in elementary school students have been selected as the subject of this study. As a tool for measuring fostering attitude and self-esteem for the children, this study has used the test for fostering attitude and the scale of self-esteem Date were analyzed to pursue research purposes as follows; According to the variable characteristics of the subjected children, this study has compared fostering attitude and self-esteem between visually impaired children and sighted children, and carried out Independent Samples t-test for both groups. For more than 3 groups, analysis of variance has been done and in case of any significant difference found among the groups through the analysis, LSD post test has been done at the trust level p<.05 in order to know which groups show actual differences. Or crosstabs for fostering attitude for the children. All the statistics have been processed through SPSSWIN. The results were as follows; First, eyesight defect had slight significant influence on low self-esteem of visually impaired children. Second, Fostering attitude for visually impaired children was more controlled by others and more rejecting than sighted children. Third, in comparison of self-esteem depending on fostering attitude, the children that have been fostered under self-regulating and accepting environment have shown higher self-esteem, and they were adapting themselves well to homes, schools, and societies. Fourth, in comparison of fostering attitude and self-esteem according to the children variables of visually impaired children and sighted children, sighted children have shown more acceptant and have had self-esteem in self controled fostering attitude than visually impaired children Fifth, in comparison of self-esteem and fostering attitude depending on characteristics of visually impaired children, it was found that the blind children, children living in a dormitory and the children who visually impaired after 7 years old live with low self-esteem in more controlled fostering attitude.

Web GIS를 활용한 지도개념학습이 학생의 인식에 미치는 영향 : "부산의 생활"을 중심으로

조현식 부산교육대학교 교육대학원 2010 국내석사

It has become more necessary that Geography education through geographical information is needed in the elementary school. But, the elementary geographic textbook is not a e-book, so it is difficult to use GIS in the classroom and teachers cannot help but burying their head in the sand for GIS. In this study using Web GIS that teachers are able to approach easily, focuses on teaching methods decreasing difficulties and miniaturizing a time of being set up.

한국프로야구에서 데이터마이닝을 이용한 홈경기의 효과에 관한 연구

조현식 단국대학교 2008 국내석사

모든 스포츠에 홈경기의 이점이 있듯이 한국프로야구에도 홈경기의 이점이 분명히 있을 것이라고 생각되어진다. 따라서 본 연구의 목적은 한국프로야구에서 홈경기의 이점이 팀의 승패에 어떤 영향을 미치고 있는지를 데이터마이닝을 이용한 세 가지 지도학습모형을 이용하여 알아보고자 한다. 모형 구축을 위하여 사용된 자료는 2000년부터 2006년까지 최근 7개년간의 한국프로야구 정규시즌 3,567경기의 자료이며, 고려된 경기 승패에 대한 주요 변수들로는 홈경기 여부, 경기직전까지의 승률, 득점의 차이, 경기별 이동거리 및 이동여부, 관중의 수 등 28개의 독립변수를 이용하였다. 본 연구에서는 로짓모형, 신경망모형, 의사결정나무모형을 이용하여 홈경기가 승리에 대한 이점으로 작용하는 지를 분석하였고 또한 각 모형에 대한 효율성도 비교하였다. 그 결과 세 가지 모형에 대한 효율성은 거의 비슷하게 나타나났으며, 유의한 홈경기의 효과는 일점 차이의 승부에서 나타났다. Using data from the 3,567 baseball games that were played in the Korean Pro-Baseball(KPB) during the 2000 and 2006 seasons, three supervised learning models that measure the likelihood of a team winning a game are estimated. Of particular interest is the effect of being the home team. As expected, the results indicate that a home-field advantage does exist in the Korean Pro-Baseball(KPB), but only under certain circumstances. Specifically, the strength of the home-field advantage varies with the number of runs scored by the home team and with the run differential between the winning and losing team. The probability of a home team winning a game increases as it scores more runs, but it increases at a decreasing rate. Also, for a given number of runs scored, a home team is more likely to win a game than a visiting team. The home-field advantage is strongest in games where the run differential between the winning team and losing team is one run.

노인의 빈곤문제와 사회보장에 관한 연구

조현식 명지대학교 사회복지대학원 2005 국내석사

You must lean to heart and soul to the old man welfare policy that you accept an old man problem of the day by national responsibility and duty, and contrasted an advanced age society. Development gets development through study of the old man welfare policy that get out of the negative policies that the government did until now, and target all old men, and guarantee a stable life, and can adapt itself to contemporary history guild, and you must go forward to. To present a plan of social security policy for this study grasps a national pension system, a path pension system, a national basis natural flower guarantee system, a senior citizen employment system during social security policies to guarantee reliably golden years of a poverty old man, and a standing copes justly about problems, and the poverty aged to be able to go out of there was, and proceeded study by literature study in a study way. The first, a poverty problem of an old man has recognition called national responsibility, and a social support system must be established in an improvement plan of a social security system to target a poverty old man. Salary susso must let you gain the majority of a total old man level through the second, national pension systems for the aged. Policy for a lot of aged excluded because of the third, the problems on a social security system for the current poverty old man must be presented. The plan that develop a type of occupation preferential a plan enlarged of a basic income plan and employment opportunity, an old man through scale minimization in the source of revenue supply sides as prevent from being expended through the fourth, strict assets investigations so that a salary is lax, and can promote working is necessary. Establishment of basic income guarantee is necessary through the fifth, expansion of the old man pension system that is independent, and there is reality so as to be able to keep alternative wide life of the aged and old man employment policy etc. Also, communality effort is necessary through proper role assignment such as an individual, a family, a community, the government etc. That is, you must devise a politic alternative by governmental effort only so as to be able to share supportive role more private than solving all problems.