• 조명전기설비학회논문지
• /
• 제22권1호
• /
• pp.95-103
• /
• 2008

제안한 유도가열 시스템은 증류탑 장치에 사용되는 특수충진체에 의한 열교환기술과 IH(Induction-Heating) 전자유도가열용의 특수한 고주파 전력회로 기술을 응용한 차세대 가열방식이다. 특히 일체의 연소과정이 없다는 점에서 작업환경의 개선이 가능하며 본 기술은 IGBT대응의 고주파 인버터를 사용하여 상용교류로부터 수[kHz]의 고주파교류(HFAC)를 발생시킬 수 있다. 본 논문에서는 1.5[kW]급 하프-브릿지 공진형 인버터 시스템과 공진부하의 동작해석, 특성분석 및 본 시스템을 이용한 2단 가열 과열증기 발생장치의 개발과 시스템의 응용에 대해 논하였다.

• 수산경영론집
• /
• 제34권2호
• /
• pp.53-73
• /
• 2003

This paper is to analyze the past and present consumption pattern of fishes aquacultured in marine waters and thus to draw the policy direction to enhance the competitiveness of marine fish aquaculture in Korea. At present, the volume of meat consumption is surveyed to be more than that of marine fish, but it is revealed that fish consumption will become more increasing in the future according to the rise of the income. The survey shows that the consumption of fish is highest in the fall, and among the various patterns of consumption, live fish, so-called susi, is surveyed to be highly dominant. It is revealed that fish is enjoyed because of the special savor, diverse nutrients, and the prevention of adult diseases. Natural fish Is revealed to be more preferred to aquacultured one due to the sticky flesh quality and the low probability of the remained after the production process antibiotics, so that it is necessary to enhance the taste quality and make a clean cultivation to capture more market demand. Consumption of high-quality fish seems to become high in more than middle class and consumption of fish are estimated to increase in the future, more than that of meat if income level of the people increases. Also, if we try to make our high-quality fish become popular among the public and competible with the imported fish from abroad, it is recommended that they must lower production price by cost reduction and try to differentiate it by taste and environmental safety, etc. It was revealed that the significant factor in demand function for fish is income and it is almost the only factor affecting that demand. Also, it was revealed that the most significant factor affecting preference of fish is income and it Is almost the only factor affecting the preference. Therefore, we can ascertain that if proper goods can be distributed, demand for and preference of fish may increase according to the increase of income in the future.

• 수산해양교육연구
• /
• 제28권5호
• /
• pp.1358-1364
• /
• 2016

Maritime accidents caused by a ship include collisions, sinking, stranding and fire etc. This study is intending to consider fire accidents among such diverse marine accidents. It is much likely that various sorts of fires break out because crewmen are living in a narrow space for long periods of time consequent on the ship's characteristic of sailing on the sea. According to the ship fire survey, about 50% of the total fire accidents occurred at an engine room, and the main fire origin was analyzed to be oil. In addition, ship fire breaks out in the order of baggage racks and living quarter. In short, the survey indicates that all sorts of fires belonging to A, B, C and D-class have occurred. This study, targeting an actual passenger ship 'A', found the response time to evacuation, during which the people on board a ship recognize the outbreak of fire, and act, and the travel time for evacuation which is the actual travel time. In addition, this study carried out a simulation through the special program for fire analysis - FDS (Fire Dynamics Simulator) in order to find the effective evacuation time, i.e. life survival time. Particularly, this study did comparative analysis of the influence on the survival of passengers and crew based on the collected simulation data by fire size and sort. As a result of the analysis, it was found that when examining the only actual evacuation movement time excepting the response time to evacuation, people are safe by completing evacuation before the effective evacuation time only in case fire size is 100Kw among all sorts of fires. In other words, in case of the outbreak of fire more than 1 MW, it was found to fail to meet evacuation safety regardless of fire size.

• 영어어문교육
• /
• 제8권1호
• /
• pp.165-198
• /
• 2002

The purpose of this research is to improve the writing ability of students by an ideal test model of English writing based on strategies of procedural learning stages enhancing the level of students' writing ability. Assessment of writing in the field of English education has been limited so far to very restricted areas with no appropriate scientific scrutiny. Assessment is really meaningful only when it exactly estimates the ability of students. Since English writing competence has become indispensable in this era of global village, writing instruction should be most emphasized. The most forceful method of busting writing instruction is to utilize the so-called washback effect of testing. So, to develop a good test model of writing, the first thing that is required is to inspect writing strategy in steps and, then, testing itself. First of all, analyzed with a special reference to the 6th high school English curriculum were the goals and contents of the syllabus reflected in one kind of junior high textbook and eight different kinds of senior high textbooks. Then questionnaires on the whole area of writing and tendencies of English writing classes were given to 100 English teachers, 300 students. The results of questionnaires were statistically analyzed. Then, some suggestions and opinions about the questioning method were made: the procedural strategy in steps, English writing instruction and test model of assessment were applied to the syllabus referring to teaching plans. On the bases of the results of the questionnaires, three pretests and a final test of English writing were administered to verify the effect of enhanced English writing competence which had been gradually promoted and, through the promotion, produced the test criteria of English writing. In conclusion, guidance and evaluation of English writing through in steps are really indispensable to increase student's practical ability and, accordingly, we are in need of the development of a testing method of useful writing practiced in school class above anything else. So, it is necessary to further the study on methods to assess writing ability on the bases of participation and fluency of students with their keen interest in English. Also, to intensify the effect of the test model, more accommodating reorganization of syllabus is required in our education. For instance, we need a flexible operation in organizing time units from the current 50 minutes to 100-130 minutes.

• 정보교육학회논문지
• /
• 제10권3호
• /
• pp.341-351
• /
• 2006

로봇 교육은 학생들의 논리적 사고와 문제 해결력 향상에 적합한 학습 도구이나, 초등학교에서 효율적인 로봇 교육을 위해서 개발된 교육과정이나 교재 그리고 전문교사를 위한 연구 자료가 거의 없다. 본 연구에서는 초등학생의 논리 및 문제 해결 능력을 신장하기 위한 도구로서 로봇의 교육적 활용에 대하여 조사 연구하였다. 초등학교에서 로봇과 관련된 내용을 교육과정에 도입하기 위하여 논의되어야 할 것이 무엇인지 조사 분석하고, 현재 개발되어 있는 교육용 로봇의 종류와 특성 등에 대하여 조사하였다. 그리고 재량활동 시간 등을 통해 로봇 교육을 실제로 담당하게 될 교사들을 대상으로 초등학교 학생들에게 효율적 로봇 교육을 위한 설문을 통하여 견해를 분석하였다. 분석된 내용을 바탕으로 초등학교 교육과정에 도입하기에 적당한 로봇의 조건, 적절한 내용, 로봇의 형태, 교수 학습 방법 등을 제시하였다.

• 대한영양사협회학술지
• /
• 제11권4호
• /
• pp.393-404
• /
• 2005

The purpose of this study was getting information to set up the new roles focused on nutrition education for school dietitians as nutrition teachers. One hundred thirty nine school dietitians and 1169 elementary school children residing in Daegu city and Gyeongbuk province were surveyed for this study. Sixty eight percent of the school dietitians perceived 1st-3rd year of the elementary school is the most proper time to start nutrition education, and 59.0% of them wanted to practice nutrition education as a discretion teaching time. The largest proportion(79.1%) of the school dietitians expected that nutrition education is helpful to get good dietary habit. School dietitians responded that major contents that should be included in the nutrition education was balanced diet, diet and habit, managing healthy weight, dining etiquette, food safety and problems of environmental contamination. Fairly large proportion of the students(64.4%) responded nutrition education is urgently needed. The contents of the nutrition education students wanted most were cooking and healthy diet. Forty six percent of the students perceived school dietitians are responsible for nutrition education and they wanted to have nutrition education as a part of special activity class. The most preferred frequency of nutrition education was 1 hour/week and 46.2% of the students responded they wanted to participate cooking camp.

• Journal of Communications and Networks
• /
• 제18권2호
• /
• pp.182-189
• /
• 2016

The focus in this paper is on obtaining tight, simple algebraic-form bounds and invertible expressions for the average symbol error probability (ASEP) of M-ary phase shift keying (MPSK) in a class of composite fading channels. We employ the mixture gamma (MG) distribution to approximate the signal-to-noise ratio (SNR) distributions of fading models, which include Nakagami-m, Generalized-K ($K_G$), and Nakagami-lognormal fading as specific examples. Our approach involves using the tight upper and lower bounds that we recently derived on the Gaussian Q-function, which can easily be averaged over the general MG distribution. First, algebraic-form upper bounds are derived on the ASEP of MPSK for M > 2, based on the union upper bound on the symbol error probability (SEP) of MPSK in additive white Gaussian noise (AWGN) given by a single Gaussian Q-function. By comparison with the exact ASEP results obtained by numerical integration, we show that these upper bounds are extremely tight for all SNR values of practical interest. These bounds can be employed as accurate approximations that are invertible for high SNR. For the special case of binary phase shift keying (BPSK) (M = 2), where the exact SEP in the AWGN channel is given as one Gaussian Q-function, upper and lower bounds on the exact ASEP are obtained. The bounds can be made arbitrarily tight by adjusting the parameters in our Gaussian bounds. The average of the upper and lower bounds gives a very accurate approximation of the exact ASEP. Moreover, the arbitrarily accurate approximations for all three of the fading models we consider become invertible for reasonably high SNR.

• 한국통신학회논문지
• /
• 제40권2호
• /
• pp.273-284
• /
• 2015

본 논문에서는 상향링크와 하향링크가 공존하는 역 듀플렉스 셀룰러 네트워크 상황에서 단방향 기지국 협력을 통한 단사 간섭 정렬 타당성에 대한 연구를 하였다. 일반적인 안테나 개수와 사용자수에 따른 단사 간섭 정렬의 필요조건과 충분조건을 제시하였고, 이어서 특정 조건을 만족하는 네트워크에서 간략화 된 충분조건을 제시하였다. 특히 대칭 네트워크 상황에서는 단사 간섭 정렬의 필요충분조건을 제시하였고, 각 셀 당 두 명의 사용자가 존재하는 대칭 네트워크 상황에서는 닫힌 형태의 필요충분조건을 규명하였다. 제안한 단방향 기지국협력을 통해 합 자유도를 크게 증가시킬 수 있으며, 모의실험을 통해 상용 신호 대 잡음비 영역에서 합 전송률을 획기적으로 개선 할 수 있음을 확인 하였다.

• 한국게임학회 논문지
• /
• 제3권2호
• /
• pp.35-41
• /
• 2003

게임 엔진에서 처리하는 속성과 절차가 매우 유사한 많은 게임 소프트웨어들이 다른 게임 에서 참조하거나 재사용하지 않고 새로운 게임을 개발할 때 게임엔진 부분에 대한 중복투자 문제가 발생한다. 특히 현재 게임 소프트웨어 개발사들이 게임을 개발할 때 매우 다양한 소프트웨어 개발 프로세스를 사용하고 있는 것이 중복투자의 주된 문제점 중 하나이다. 그러므로 게임엔진에 대한 프로세스의 표준화가 되어있지 않아 현재 개발 중인 게임 소프트웨어에 다른 소프트웨어 개발과정에서 생성된 산출물을 이해하고 재사용할 수가 없다. 따라서 어느 게임 소프트웨어 개발사가 특정 게임을 개발할 때 다른 게임 소프트웨어와 동일한 게임 엔진 처리에 대하여 새롭게 분석하고 설계하는 것이 현재의 게임 소프트웨어가 안고 있는 커다란 문제점이다. 이러한 문제점을 해결하기 위해 본 논문에서는 컴포넌트 기반 개발방법을 적용할 수 있도록 게임 엔진 개발에 대한 공정개선, 구조와 관계성 분석, 계층별 모듈별 분류와 조합 방법, 저장소 구현, 프로세서 모형을 제시하였다.

• 대한한의진단학회지
• /
• 제10권2호
• /
• pp.1-30
• /
• 2006

Maek Kyoung(Mai Jing, 脈經) is the first chinese specialized book of diagnostics written by Wang Hee(Wang xi, 王熙) from Seo Jin(xi jin, 西晉). He assorted the contents with pulse and medical examination from Nae Kyoung(nei jing, 內經), Nan Kyoung(nan jing, 難經), Sang Han Ron(shang han lun, 傷寒論) and Jung Jang Kyoung(zhong cang jing, 中藏經). And united with his own research, he explains medical examination and the way of talking the pulse by classifying into entrance and class. Maek Kyoung(Mai Jing, 脈經) was imported Korea by Ji Chong(zhi cong, 知聰) AD 561, and he passed through Ko Ku Ryeo(gao gou li, 高句麗) with Nae Wei Jeon(nei wai dian, 內外典), Yak Seo(yao shu, 藥書), Myung Dang Do(ming tang tu, 明堂圖) and MaekKyoung(Mai Jing, 脈經) to be naturalized in Japan. This treatise make a special study of the second volume of the Maek Kyoung. It consists of the four chapters : Pyoung Sam Kwan Eum Yang E Sip Sa Ki Maek Je I1(平三關陰陽二十四氣脈第一), Pyoung In Young Sin Mun Ki Ku Jeon Hu Maek Je E(平人迎神門氣口前後脈第二), Pyoung Sam Kwan Byoung Hu Byoung Chi Eui Je Sam(平三關病侯幷治宜第三), and Pyoung Gi Kyoung Pal Maek Byoung Je Sa(平奇經八脈病第四). Bi Geup Choun Geum Yo Bang(備急千金要方) and Eui Hak Ip Mun(醫學入門) quoted from the contents in the second volume of Maek Kyoung, and Bin Ho Maek Hak(瀕湖脈學), Gi Kyoung Pal Maek Go(奇經八脈攷) and Maek Eo(脈語) extracted from contents in the second volume of the Maek Kyoung and requoted from this contents. Contents in the second volume of the Maek Kyoung have very valuable data like that, but the literature on this subject in the form of a treatise has not been yet in Korea. So I hope this study will be useful to develope Diagnostics by correcting translation and interpretation and fixing wrong translation.