• 한국정보처리학회논문지
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• 제7권4호
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• pp.1160-1168
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• 2000

Due to the increase in importance of factory-automation (FA) in the field of production, the importance of he autonomous guided vehicle's (AGV) role has also increased. This paper is about an active and effective controller which can flexibly prepare for changeable circumstances. For this study, research about an behavior-based system evolving by itself is also being considered. In this paper, constructed an active and effective AGV fuzzy controller to be able to carry out self-organization. To construct it, we tuned suboptimally membership function using a genetic algorithm (GA) and improved the control efficiency by self-correction and the generation of control rules.

• 폴리머
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• 제24권5호
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• pp.682-689
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• 2000

고분자의 구조설계를 통해서 단상의 블렌드를 제조하기 위해서는 고분자 반복 단위간의 열역학적 정보가 필수적으로 요구된다. 본 연구에서는 블렌드를 구성하는 각 성분간의 상호작용 에너지를 결정하고 이를 이용하여 단상의 블렌드를 제조하는 방법을 제시하였다. 이를 위하여 폴리카보네이트들과 여러 종류의 폴리메타크릴레이트간의 상용성을 조사하였으며, 이를 바탕으로 고분자 구조를 조절하여 단상의 블렌드를 제조하였다. 또한 단상의 블렌드에 포함된 각 고분자간의 상호작용 에너지는 LCST 거동에 의한 상분리 온도와 상태방정식을 이용하여 정량화 하였다.

• 한국정보통신학회논문지
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• 제4권4호
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• pp.759-765
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• 2000

생산라인의 예기치 않은 운전정지로부터 손실을 피하기 위한 기기의 조기 경보 체제인 고장 진단 시스템은 매우 중요하다. 베어링은 베어링 자체가 비선형이기 때문에 초기에 베어링의 이상 진단을 행한다는 것은 매우 어렵다. 본 연구에서는 압연기 베어링의 상태진단의 변수로 베어링의 진동 신호를 선택하고 이 진동신호에서 비선형성이 강한 신호 즉 카오스적 거동이 있음을 FFT, 타켄스의 매립법과 포엔카레 단면을 이용하여 확인하였다.

• Advances in nano research
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• 제14권1호
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• pp.67-80
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• 2023

Economic investigation is one of the main issues regarding the design and production of small-scale structures. This paper concerns the creation, implementation, and economic aspects of the cross-section profile of small-scale structures regarding the dynamic response of the free and forced vibration behavior of spinning nanoscale beams based on big data analysis. According to the financial analysis, the three practical non-uniform functions of cross-sections are compared to the uniform beam in the same weight and the equal material used. The previous studies reported that the uniform beams are more stable and contain a better frequency response based on the mechanical analysis. Still, concerning the economic investigation, which means the considered structures should have equal length and have the same weight in the aspect of material used, the conclusion can be different from the mechanical aspect. Consequently, in the current paper, the dynamic response along with computer technology as well as the big data analysis of the free and forced vibration of the nanobeam regarding the economic shape of the cross-section is scrutinized.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 추계학술대회
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• pp.297-299
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• 2021

치밀오일 미래 생산성 예측은 잔류오일 회수량 및 저류층 거동 분석을 위해 중요한 작업이다. 일반적으로 석유공학적 관점에서 감퇴곡선법을 이용하여 생산성 예측이 이루어지는데, 최근에는 데이터기반의 머신러닝 기법을 이용한 연구도 수행되고 있다. 본 연구에서는 딥러닝 기반 순환신경망과 LSTM, GRU 알고리즘을 이용하여 미래 생산량 예측을 위한 효과적인 모델을 제안하고자 한다. 입력변수로는 치밀오일 생산 시 산출되는 오일, 가스, 물과 이와 더불어 다양한 군집분석을 통해 산출된 표준곡선이 주요 매개변수이고, 출력변수는 월별 오일 생산량이다. 기존의 경험적 모델인 감퇴곡선법과 순환신경망 모델들을 비교하였으며, 모델의 예측성능을 향상시키기 위해 하이퍼파라미터 튜닝을 통해 최적 모델을 도출하였다.

• 지역사회간호학회지
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• 제9권2호
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• pp.441-457
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• 1998

The purpose of this study is to provide fundamental information for the development of new sex education image media through the analysis of those tools produced by Planned Parenthood Federation of Korea. Twenty three video tapes related to the sex education were analysed. The data were sampled on the basis of the sex education instructions for primary and secondary schools published by the Seoul Office of Education in 1996 and the list of sex education information composed by the Planned Parenthood Federation of Korea with the following requirements. 1) The education materials are oriented to the middle and high school students as well a juveniles and are being used in public health centers and schools. 2) The education materials are not confined to the single subject such as AIDS or contraception. Because this study is focused on the analysis of image media, an analysis method widely and effectively used in public media study was chosen. The frequency analysis and percentage treatment were done by an SAS program. The results of the study are as follows : 1. An analysis of the material structure type showed that the frequency of the following subjects in 15 video tapes, composed as drama and cartoon, had this decreasing orde : sex behavior, sex relation ships, sex health, human development, personal technique, and society and culture. 2. The eight tapes of explanation and counseling showed a different sequence from that of the drama and cartoon material, primarily treating human development with 5419 seconds (47.9%) of type. The following were also considered in decreasing order: at 2000seconds (17.6%) sex behavior, at 1366 seconds (12.1%) sex health, at 1240 seconds (11.0%) society and culture, at 667 seconds (6.0%) relation ships, and at 611 seconds (5.4%) personal technique. 3. In a thematic analysis those education materials dealing with human development show this frequency sequence: anatomic physiology, reproduction, and adolescence. In relation, ships the sequence is dates, love, marriage and vows, and family. For personal technique, it is expressed as asking for help, and an empnasis on moral values. For sex behavior, they focus on abstinence, the co-responsibility of sex behavior, the sexual response of the human, and sexual nightmares. For the sex health area, the focus is contraception with abortion and reproductive health following that. In society and culture diversity is considered. 4. An analysis of the differences in production and content between 1980s and 1990s was also done. For materials produced in the 1980s the frequency of the subjects follows this order: sex behavior, human development, relation ships, sex health, personal technique, and society and culture with sub subjects such as abstinence, dating, adolescence, anatomic physiology, reproduction, calls for help, and the sexual response of a human being. For materials produced in the 1990s, highest frequency was sex behavior, the same as the 1980s. The rest of the material follows this decreasing order: relationships, human development, sex health, society and culture, and personal technique with sub subjects such as dating, co-resposibility in sex behavior, abstinence, and love frequently considered.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제2권11호
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• pp.801-808
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• 2013

인터랙티브 3D 콘텐츠에서 가상공간은 현실세계를 얼마나 충분히 반영하느냐에 따라 사용자의 심리적 만족도가 결정된다. 완성도 높은 가상공간을 표현하기 위해서는 몇 가지 요소가 필요하다. 첫째는 시각적 효과를 높이기 위해서 많은 폴리곤과 해상도 높은 텍스쳐를 이용한 모델링 기법이다. 둘째는 기능상의 효과이다. 이것은 가상공간과 사용자 또는 시스템과의 인터랙션을 통한 동적 행위들이 얼마나 사실적으로 표현되는가이다. 이를 위해 가상의 캐릭터에 대한 애니메이션 생성하고 행동을 제어 할 수 있는 기법에 대한 연구가 이루어져 왔으나 긴 제작 시간 또는 높은 비용이 소요되거나 원하는 행동을 생성하지 못하는 경우가 발생하는 문제점이 발견되어 왔다. 본 논문에서는 캐릭터의 동작을 생성하는 최적화되어 있는 골격구조를 설계하고 물리법칙과 수학적 해석을 이용한 절차적 기법을 통해 인공물고기의 행동 제어하는 방법을 제시한다. 이는 정해진 이벤트에 대해 반응하는 일대일 대응 규칙의 한계성에서 벗어나 간단한 파라미터의 조작을 통해 제작 시간을 단축하고 시각적 만족도를 높일 수 있을 것이다.

• 한국의상디자인학회지
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• 제20권4호
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• pp.175-186
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• 2018

These days, due to increased income levels, lower birthrate, and increased marriage age, interest and investment in children has increased, and infant & children's clothes has become more upgraded, differentiated, and diversified. In accordance with the change of the infant & children's clothes market, Examine the research trends of the papers in the journals. Used 'KISS', 'DBpia', 'Korea Institute of Science and Technology Information', in the search system, and 137 papers were searched for by using key word, 'infant's clothes' and 'children's clothes'. The year of publication is limited to 2001 to 2017, and they are classified into 5-year units and again the papers were classified by year, by journal, by field of clothing research (Technical Design & Production, Fashion Marketing, Textile System, Fashion Design), and frequency and percentage were used as data analysis. The number of articles related to infant & children's clothes increased such as 39 in 2001~2005, 43 in 2006~2010, and 55 in 2011~2017. The distribution of articles by journals has been published mainly in the journal of the Korean Society of Clothing and Textiles, but as the journals were diversified, they were distributed evenly in other journals related to the apparel. In the presentations according to the research field by year, from 2001 to 2005, the ratio of apparel design and production was high, but since 2006, many papers related to fashion marketing and fashion design have been published. The research contents of the field of clothing research are as follows: 41 articles in design production field, focusing on dimensional system and pattern design, 40 articles in fashion design field, focusing on design development and design preferences, 46 articles in fashion marketing field, focusing on consumer behavior and marketing management. And 10 articles in apparel material system field, focusing on research on cloth science materials, but they are less well studied than others, but these studies should be actively pursued in the future.

• 한국수산과학회지
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• 제43권2호
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• pp.159-168
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• 2010

This paper presents a mathematical model and simulation method for investigating the performance of set net systems and fish cage systems influenced by currents and waves. Both systems consist of netting, mooring ropes, a floating collar and sinkers. The netting and ropes were considered flexible structures and the floating collar was considered an elastic structure. Both were modeled on a mass-spring model. The structures were divided into finite elements and mass points were placed at the mid-point of each element, and the mass points were connected by mass-less springs. Each mass point was subjected to external and internal forces and the total force was calculated at every integration step. An implicit integration scheme was used to solve the nonlinear dynamic system. The computation method was applied to dynamic simulation of actual systems simultaneously influenced by currents and waves in order to evaluate their practicality. The simulation results improved our understanding of the behavior of the structure and provided valuable information concerning the optimized design of set net and fish cage systems exposed to an open ocean environment.

• Geomechanics and Engineering
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• 제34권1호
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• pp.43-49
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• 2023

Knowledge of minimum horizontal stress (S_hmin) is a significant step in determining full stress tensor. It provides crucial information for the production of sand, hydraulic fracturing, determination of safe mud weight window, reservoir production behavior, and wellbore stability. Calculating the S_hmin using indirect methods has been proved to be awkward because a lot of data are required in all of these models. Also, direct techniques such as hydraulic fracturing are costly and time-consuming. To figure these problems out, this work aims to apply the long-short-term memory (LSTM) algorithm to S_hmin time-series prediction. 13956 datasets obtained from an oil well logging operation were applied in the models. 80% of the data were used for training, and 20% of the data were used for testing. In order to achieve the maximum accuracy of the LSTM model, its hyper-parameters were optimized significantly. Through different statistical indices, the LSTM model's performance was compared with with other machine learning methods. Finally, the optimized LSTM model was recommended for S_hmin prediction in the well logging operation.