• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2005년도 동계학술발표대회 논문집
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• pp.179-185
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• 2005

Nowadays, study about hydrogen fuel which consist of hydrogen extraction process, reforming, fuel cell equipment, and receptacle are flourish all over the world. Currently, Korea hydrogen station is still underdevelopment. Yet the most important part such as hydrogen compressor has not been develop. Therefore, if the high pressure compressor for hydrogen have been developed by domestic technology. In the future many benefit can be gain instead of importing. Such as many hydrogen station can be built in Korea, and also Korea will be able to provide hydrogen system for worldwide. This study is going to analysis hydrogen compressor in order to store high pressure hydrogen. This is almost approach practical use of tile hydrogen storage method.

• Journal of Electrical Engineering and Technology
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• 제13권5호
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• pp.1935-1944
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• 2018

With the increase of the production of energy from renewable, it becomes important to look at techniques to store this energy. Therefore, a single winding bearingless flywheel motor (SWBFM) specially for flywheel energy storage system is introduced. For the control system of SWBFM, coupling between the torque and the suspension subsystems exists inevitably. It is necessary to build a reasonable radial force mathematical model to precisely control SWBFM. However, SWBFM has twelve independently controlled windings which leads to high-order matrix transformation and complex differential calculation in the process of mathematical modeling based on virtual displacement method. In this frame, a Maxwell tensor modeling method which is no need the detailed derivation and complex theoretical computation is present. Moreover, it possesses advantages of universality, accuracy, and directness. The fringing magnetic path is improved from straight and circular lines to elliptical line and the rationality of elliptical line is verified by virtual displacement theory according to electromagnetic torque characteristics. A correction function is taken to increase the model accuracy based on finite element analysis. Simulation and experimental results show that the control system of SWBFM with radial force mathematical model based on Maxwell tensor method is feasible and has high precision.

• 한국산학기술학회논문지
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• 제20권2호
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• pp.173-179
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• 2019

본 연구의 목적은 학교 유형별 고등학교 학생들의 식품위생 태도와 개인위생 관리에 관한 교육 프로그램의 개발을 위한 기초 자료를 제공하는 것이다. 2015년 7월 16일부터 10월 15일 까지 충남지역 16개 고등학교의 학년 당 30명씩에게 설문지를 배포하였고, 미회수 및 불충분한 설문지를 제외한, 총 1214 부(인문고등학생 473명과 특성화고 741)에 대해 SPSS(ver 18.0)을 사용하여 통계처리하였다. 연구 결과, 인문계 고등학생은 특성화 고등학생보다 식품을 살 때 유통기한을 더 확인하고(3.79, 3.60), 조리 가열된 식품을 보관 후 그대로 먹는다는 응답이 낮았고(2.85, 2.98), 식품의 특성에 맞게 냉장 냉동 보관 저장한다(3.90, 3.76)고 하였다. 인문계 고등학생이 특성화 고등학생보다 식사 전 손씻기(3.66, 3.52), 화장실 다녀온 후 손씻기(4.30, 3.95), 올바른 방법으로 손씻기(3.63, 3.45)를 잘하였고, 식사시간 중에 돌아다니기(2.19, 2.43)와 식사시간 중간에 화장실을 적게 가는 것(2.28, 2.47)으로 조사되었다. 본 연구에서, 일반 고등학생과 특성화고등학생들은 식품위생태도와 개인위생 관리 부분에서 유의적 차이를 보였고, 일반 고등학생이 특성화 고등학생보다 식품위생태도와 개인위생관리를 잘하는 것으로 조사되었다. 그러나 그 정도는 높지 않아, 개선이 필요한 것으로 사료된다. 따라서 학교유형에 따라 식품위생태도와 개인위생 관리에 대한 교육을 강화해야 함을 제언한다.

• 농촌지도와개발
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• 제2권1호
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• pp.41-54
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• 1995

The purposes of the study were to find out the basic needs of rural people and to get some implications for the integrated rural regional development. The data were gathered from 376 local government officers and change agents in 8 Provinces. Major results of study were as follows ; (1) Average income of rural households meet $90{\sim}100$ present of average income of urban households. (2) Most of respondents replied that average labor inputs should not exceed $7{\sim}8$ hours per a day. (3) Basic requirement of school career for the rural life was high school graduate. (4) Education expenditure should be less then 6 percent of total consumption expenditure. (5) Rural people should be able to access to basic public facilities such as school, hospital and drag store within thirty minitues. (6) Desirable housing space for rural life was $66{\sim}72.5m^2$. (7) Rural people should enjoy $3{\sim}4$ times of cultural activities and $3{\sim}4$ times of tours in a year.

• 한국정밀공학회지
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• 제17권12호
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• pp.151-156
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• 2000

A vibration in a high-speed machine may lead to machinery malfunction and even catastrophic failure. So solving the vibration problem is a fundamental requirement for the stability of the high-speed machine. The flywheel energy storage system using superconducting magnetic bearings is a device to store electrical energy as rotational kinetic energy by motor and to convert it to electrical by generator when necessary. The high-speed rotating flywheel has large amplitude at a critical speed. And it has an unstable behavior by the electric torque at the first stage of the energy generation. In this paper, the stability analysis is performed with an analytical model and equations of motion-which is considered the effect of the electric torque-to identify the stable driving condition and the dynamic behavior.

• 한국의류학회지
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• 제26권9호
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• pp.1320-1330
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• 2002

The purpose of this study was to classify Y generation according to Hip Hop mania elements and to investigate the differences in psychological characteristics (self-consciousness, egocentrism) and buying behavior of Hip Hop fashion among the classified groups. The subjects were 500 middle and high school students living in Seoul and Kyonggi area.46g data were analysed using cluster analysis, ANOVA and Duncan's multiple range test. The results were as (follows : As a result of classifying Y generation with Hip Hop mania element including behavior and attitude aspect they were classified into three groups; Hip Hop mania group, Hip Hop interesting group, Hip Hop uninterested group. Among groups there were significant differences in public and private self-consciousness, self-centeredness, evaluative criteria of Hip Hop fashion, information sources and clothing store patronage. Hip Hop Mania group showed significantly higher level in both public and private self-consciousness, thus the members of the group were so egocentric in their thinking and behavior. When they purchased Hip Hop fashion, they regarded both aesthetic appreciation and practicality as import information.

• 복식문화연구
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• 제6권3호
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• pp.73-87
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• 1998

The purpose of this study was to identify fashion leadership and information seeking as a part of adolescents'clothing purchase behavior study. The questionnaire was administered to 291 junior high school students. The data were analyzed using factor analysis, t-test and ANOVA utilizing SPSS/PC/sup +/. The results of this study were as follows: 1. The adolescents usually used store information seeking and consultation with friends as continuous information seeking. The adolescents usually read fashion articles in the fashion magazine more than fashion advertisements. As information seeking before purchasing, they watched store displayed or window displayed clothes the most, and then consulted with friends or family members. The degree of information seeking before purchasing was significantly different according to the number of purchasing clothes. 2. Three factors (mass communication informations, observation & personal information, and family members information) of information sources derived by factor analysis. 3. Three groups were classified as fashion leaders, fashion flowers, and fashion laggards according to fashion leadership. Girls perceived themselves as fashion leaders much more than boys did. There was significant difference among three fashion leadership groups in the number of purchasing clothes and price partially. 4. Fashion leaders seeked the continuous information and mostly used mass communication information sources and observation & personal information as information sources before purchasing clothes.

• 지능정보연구
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• 제8권2호
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• pp.139-157
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• 2002

본 연구에서는 기존 협업 필터링의 문제점을 해결할 수 있는 효율적인 상품추천 방법론을 제시하고자 한다. 연구에서 제시하는 상품추천 방법론은 기존 협업 필터링 알고리즘의 데이터 희박성 문제 및 동의어 문제를 극복하기 위하여 판매 데이터로 구성된 제품 계층도(Product Taxonomy)를 이용하며, 이 계층도를 기반으로 한 연관 규칙(association rule)과 의사결정 나무를 사용한다. 본 연구에서는 제시한 방법론을 단계별로 설명하였을 뿐만 아니라, 실제 H 백화점 데이터를 이용하여 적용하였다. 다양한 경우에 대하여 실험을 한 결과, 기존의 협업 필터링 알고리즘이 갖고있는 문제점을 상당히 해결하였음을 제시하였다. 이 연구에서 제시한 상품 추천 방법론은 현재 기업이 직면한 경쟁환경 하에서 고객이 과연 누구이며, 고객이 진정 무엇을 원하고 있는지를 파악하는데 도움을 줄 것이며, 고객관계관리 (CRM)를 효율적으로 구현하는 방법론으로 사용될 것으로 기대된다.

• 대한지리학회지
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• 제45권5호
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• pp.609-627
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• 2010

입지는 모든 산업에 있어서 성공의 핵심적인 결정요소이기 때문에 잘못 선정된 입지는 아무리 유능한 운영자라 할지라도 많은 어려움을 겪기 마련이다. 이에 본 연구는 보다 합리적이고 간편한 소매점의 입지 선정 모델을 만들고자 서울시 소재 대형마트를 대상으로 허프의 확률이론을 적용하여 점포별 점유인구를 산출하였다. 점유인구를 바탕으로 모든 단위 구역을 상점간 경쟁 상대를 나타내는 4개의 시장유형, 즉 독점시장, 과점시장, 경쟁시장 비경쟁시장으로 구분하였다. 신규점포가 입지에 가장 합리적인 장소는 점유인구를 가장 많이 확보할 수 있는 지점으로, 비경쟁시장을 최대한 확보할 수 있으면서, 경쟁시장에서 멀리 떨어진 곳이다.

• Journal of Information Processing Systems
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• 제19권3호
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• pp.385-393
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• 2023

Since the proportion of elderly citizens is increasing every year, the social interest is increasing for the health and the safety of the elderly. The nursing home is continually being created to care for more elderly people. However, the quality of service is not enough due to the lack of elderly caregivers. Elderly care and management services are being studied to replace the shortage of caregivers. Existing research for the implementation of an automatic care system has a high initial system cost. Furthermore, it lacks the ability to store and manage large amounts of data. In this paper, we propose a system that manages a large amount of data continuously generated through CCTV and provides a streaming service with a high level of quality-of-service (QoS) to users with collected video. Through the proposed system, it is possible to record and manage the behavioral information of the elderly occurring in the nursing home together with the video. In addition, according to the user's request, it has built a service that streams the video and behavioral information according to the date and time in real-time.