• 한국가정과교육학회지
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• 제13권1호
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• pp.73-91
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• 2001

The purpose of this study was to analyze the changes in home management part in the home economics textbooks for middle school from the 1st to the 7th curriculum period. The part of home management in the all of home economics textbooks published in every curriculum period was analyzed using several external criteria of textbook. The major findings of this study were as follows : 1. The part of home management was divided into even specific areas including 'definition and process of home management'. 'time management'. 'household labor/work management'. 'family financial management'.'purchasing'. and 'consumer protection'. 2. The part of home management has been included in the middle school home economics textbooks since the 1st curriculum period. The proportion of this part in the whole textbook varied with range from 5.1% to 31.8%. 3. The areas emphasized in the beginning of curriculum period were 'family financial management'and 'household labor/work management'. and 'utilization of family resource and environment management'were the areas emphasized in the later curriculum period. 4. The titles of the middle and small unit have begun to use recent words and have represented the including contents since the 4th curriculum period. 5. The numbers of illustrations. tables. pictures. and activities have increased since the 6th curriculum period. 6. Other unrelated areas such as computer and career preparation were included in the home management part in the 1st. 2nd. and 5th curriculum period.

• 한국항공운항학회지
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• 제5권1호
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• pp.65-79
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• 1997

본 연구에서는 항공기의 지상활주에 필요한 측방 경보장치를 구현 하였다. 장치는 장애물 검출부, 송신부, 수신부, 그리고 경보부로 구성하였다. 장애물 검출부는 40KHz대의 초음파에 의한 펄스비행법을 채택하였고 송/수신부는 447 MHz 대의 RF모듈을 사용하였다. 경보부는 컴퓨터를 사용하여 수신된 거리 데이터로부터 경보를 한다. 검출장치는 주날개의 좌우측 끝과 수평 안정판의 좌/우측 끝에 장착한다. 장애물 검출거리는 10m로 설정하였다. 실험 결과 만족한 결과를 얻을 수 있었다.

• 설비공학논문집
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• 제27권11호
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• pp.567-573
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• 2015

Commercial buildings account for significant portions of the total building energy in Korea, and thus, a variety of research on chiller operation has been carried out. However, most of the studies were carried out on the chiller itself, i.e., the part load ratio characteristics and the corresponding electricity energy consumption patterns were not analyzed in existing studies. In this study, the part load ratio and the operating characteristics of the vapor compression chiller were analyzed within an office building equipped with the conventional variable air volume system. As a result, significant portions of total operating hours, cooling load, and energy consumption turned out to be in the part load ratio range of 0 through 50%. Thus, energy consumption was significantly affected by the chiller COP at low part load conditions, indicating that chiller operation at the part load is an important factor in commercial buildings.

• International Journal of Advanced Culture Technology
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• 제8권1호
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• pp.141-151
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• 2020

The purpose of this study is to investigate the positive and negative effects of college student part-time experience on college life. The subjects were 335 college students in Chungcheongnam - do. The data were collected by the self - study questionnaire on general characteristics, part - time experience, university life. There is more positive viewpoints in the Area of Public Health than in other majors and in the third grade and it shows that the higher the grade it is, the more positive viewpoints there is. The longer the period of doing part-time work it is, the more negative viewpoints about the life in the university there is, and it needs to be paid attention to. The factors which affects to the positive viewpoints about the life in the university which needs to be paid attention to was the grade and marks, and the negative viewpoints about the life in the university which needs to be paid attention to was marks, economic status, and the period of doing the part-time work. The factors which affects to the positive viewpoints and the negative viewpoints, there needs to be the clear and detailed education, counselling, and welfare, and based on the conclusion of this research, there needs to be a practical solution to improve the life of the university of the students who are experiencing part-time work.

• 소성∙가공
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• 제18권2호
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• pp.177-182
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• 2009

A work of thin-walled outsell injection molding technology for a plastic part of moldframe applicable in a display product was performed in the present study. The thin-walled plastic part is one of the core parts in the display product, which supports and protects a light guide plate and back light unit from external environmental conditions. It globally has the shape of rectangular and surrounds the light guide plate and back light unit for each class of inch, however, the cross section of the part is not clear to define the thickness. This causes the difficult problem of injection molding itself for the part. Moreover, a metal outsell part makes a difficult problem in injection molding over it. Because the mold temperature control of the parts are not uniform in thickness direction due to the metal part. A careful injection melding analysis and injection mold design from the analysis results have to be proceeded to obtain a production of precision moldframe. Therefore, optimization for injection molding process and analysis of warpage characteristics were studied. Consequently, it was possible from the presented virtual manufacturing process that the manufacturing of precision thin-walled outsell moldframe.

• 대한전기학회논문지:시스템및제어부문D
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• 제55권4호
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• pp.161-164
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• 2006

In this thesis we designed the vision system to inspect the defect of a back light unit of plat panel display device. The vision system is divided into hardware and inspection algorithm of defect. Hardware components consist of illumination part, robot-arm controller part and image-acquisition part. Illumination part is made of acrylic panel for light diffusion and five 36W FPL's(Fluorescent Parallel Lamp) and electronic ballast with low frequency harmonics. The CCD(Charge-Coupled Device) camera of image-acquisition part is able to acquire the bright image by the light coming from lamp. The image-acquisition part is composed of CCD camera and frame grabber. The robot-arm controller part has a role to let the CCD camera move to the desired position. To take inspections of surface images of a flat panel display it can be controlled and located every nook and comer. Images obtained by robot-arm and image-acquisition board are saved on the hard-disk through windows programming and are tested whether there are defects by using the image processing algorithms.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2002년도 유체기계 연구개발 발표회 논문집
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• pp.290-297
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• 2002

This paper presents analysis results for the effect of power control strategies on the part load performance of gas turbine based power generation systems utilizing exhaust heat of the gas turbine such as cumbined cycle power plants and regenerative gas turbines. For the combined cycle, part load efficiency variations were compared among different single shaft gas turbines representing various technology levels. Power control strategies considered were fuel only control and IGV control. It has been observed that gas turbines with higher design performances exhibit superior part load performances. Improvement of part load efficiency by adopting air flow modulation was analyzed and it is concluded that since the average combined cycle performance is affected by the range of IGV control as well as its temperature control principle, a control strategy appropriate for the load characteristics of the individual plant should be adopted. For the regenerative gas turbine, it is likewise concluded that maintaining exhaust temperature as high as possible by air flow rate modulation is required to increase part load efficiency.

• 말소리와 음성과학
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• 제8권4호
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• pp.49-61
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• 2016

The present study investigates the perception of Korean phonation types by native speakers of Aymara. Perception tests were conducted on two sets of Korean speech materials to determine correspondence between Korean and Aymara 3-way contrasts and to find out which of the consonantal and vocalic part of the syllable is more influential in the perception of Korean phonation types. A set of manipulated stimuli, as well as a set of 12 spontaneous words, were prepared for the tests. The first syllable of the 12 Korean bisyllabic words of 3 series of phonation types(Lenis, Aspirated, and Fortis) in 4 places of articulation were split into consonantal and vocalic parts. And then the two parts were combined to form 9 tokens of CV sequences respectively for each place of articulation. Native speakers of Aymara were forced to match Korean stimuli with one of the 15 Aymara words which represent 3 series of consonant types(plain, aspirated, and ejective) in 5 places of articulation(bilabial, alveolar, palatal, velar, and uvular). Results showed that the consonantal part is more influential than the vocalic part to the Aymara subjects' perception of Korean phonation types when the consonantal part is Aspirated in its phonation type, but the vocalic part is more influential than the consonantal part when the consonantal part is Lenis or Fortis in its phonation type. Response analysis showed that Aymara subjects tend to match Korean stops to Aymara ones in such a way that Lenis corresponds to aspirated, Aspirated to aspirated, and Fortis to plain.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.111-116
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• 2002

The types of service using location Information are being various and extending it's domain as wireless internet technology is developing and it's application part is widespread, so it is prospected that LBS (Location-Based Services) will be killer application in wireless internet services. This location information is basic and high value-added information, and this information services make prior GIS (Geography Information System) to be useful to anybody. The acquisition of this location information from moving object is very important part for these LBS. After this, when LBS is familiar to everybody, we can predict that LBS system load is so heavy for the acquisition of so many subscribers and vehicles. Moving object database (MODB) system manages objects like subscribes and vehicles that are moving and have telecommunication terminal checked one's location. MODB is consists of 4 part, moving object location acquisition part, moving object location storage part, moving object query processing part, and moving object application p art. In this MODB system, acquisition of moving object location part must provide guarantee location information as well as reduce telecommunication overhead. In this paper, we study of problems in acquisition a huge number o f moving objects location and design some acquisition strategies to reduce telecommunication overhead. And after implementation these strategies, we estimate performance of this system and quality of information.

• 한국제4기학회지
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• 제17권2호
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• pp.13-14
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• 2003

It is generally well known that Quaternary is characteristic geologically in terms of glacial and interglacial repeats and their associated unconformity formation. This paper deals with the first finding of the characteristic and significant meaningful unconformity between Holocene and late Pleistocene, which implies submergence and emergence of the tidal sedimentary basin along the western coastal zone of Korea during interglacial stage(IOS-5e) and glacial time(IOS-2). The stratigraphy of intertidal deposits in the Haenam Bay, western coast of Korea shows two depositional sequence units (Unit I of Holocene and Unit II of late Pleistocene) bounded by an erosional surface of disconformity. The disconformity is related to the latest Pleistocene sea-level lowstands (probably during the LGM). The Unit II is interpreted as intertidal deposit showing tidal sedimentary structures and crab burrow ichnology and has two parts (the upper part and the lower part) showing different lithology and character. The upper part of Unit II shows characteristic subaerial exposure features (emergence) and its related lithology. Such subaerially exposed upper part (more or less 4m to 5m in thickness) is characterized by yellow-brownish sediment color, cryoturbat-ed structure, crab burrow ichnofacies and high value of shear strength. Geochemical and clay mineral analyses of the upper part sediments also indicate subaerial exposure and weathering. In particular, very high value of magnetic susceptibility of the upper part in comparison to that of the lower part is interpreted as pedogenetic weathering during the subaerial exposure period.