• 패션비즈니스
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• 제28권2호
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• pp.139-151
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• 2024

In recent years, consumer clothing behaviors have undergone significant changes due to global phenomena such as climate change, pandemics, and advances in IT technology. Laundry behaviors closely connected to how consumers handle clothes and their clothing lifecycle have also experienced considerable transformations. However, research on laundry behavior has been limited despite its importance in understanding consumer clothing habits. This study employed text mining analysis of social data spanning the past decade to explore overall trends in consumer laundry behavior, aiming to understand key topics of interest and changes over time. Through LDA topic modeling analysis, nine topics were identified. They were grouped into subjects, targets, methods, and reasons related to laundry. Analyzing relative frequencies of keywords for each topic group revealed evolving consumer laundry behavior in response to societal changes. Over time, laundry behavior showed a dispersal of agents and locations, increased diversification of laundry targets, and a growing interest in various methods and reasons for doing laundry. This research sheds light on the broader context of laundry behavior, offering a more comprehensive understanding of consumer attitudes and perceptions than previous studies. It underscores the significance of laundry as a daily, socio-cultural aspect of our lives. Additionally, this study identifies changing customer values and suggests improvements and strategic branding for laundry services, providing practical implications.

• 한국강구조학회 논문집
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• 제17권6호통권79호
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• pp.707-715
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• 2005

파형강판은 파형 형상으로 가공된 강판으로 높은 면내, 면외 방향의 강성을 갖으며, 건물, 교량 등으로 적용도가 높아지고 있다. 파형강판을 플레이트 거더나 프리스트레스트 박스거더교의 복부판으로 적용하면, 파형강판의 아코디언 효과에 의해 플랜지가 휨응력을 복부판이 전단응력을 대부분 지지하는 효율적인 구조를 얻을 수 있다. 전단응력을 받는 파형 강판은 전체좌굴, 국부좌굴 및 연성좌굴에 의해 내하력을 상실할 수 있다. 세 가지 좌굴 모드 중 연성 좌굴에 대한 명확한 분석은 거의 이루어지지 않았고 보수적인 강도 예측을 위한 강도 감소식이 사용되고 있다. 따라서 본 연구에서는 연성 좌굴 거동에 미치는 기하학적인 인자들의 영향을 파악하기 위하여 유한요소해석법을 이용한 좌굴해석이 수행되었다. 해석 결과는 연성 좌굴은 패널의 세장비와 북부판 높이 두께비의 복합변수에 의존하는 것으로 나타났다.

• Structural Engineering and Mechanics
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• 제63권1호
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• pp.23-35
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• 2017

A nonlinear static procedure considering work-energy principle and global failure mechanism to estimate base shears of reinforced concrete (RC) frame-type structures is presented. The relative energy equation comprising of elastic vibrational energy, plastic strain energy and seismic input energy is obtained. The input energy is modified with a factor depending on damping ratio and ductility, and the energy that contributes to damage is obtained. The plastic energy is decreased with a factor to consider the reduced hysteretic behavior of RC members. Given the pre-selected failure mechanism, the modified energy balance equality is written using various approximations for modification factors of input energy and plastic energy in scientific literature. External work done by the design lateral forces distributed to story levels in accordance with Turkish Seismic Design Code is calculated considering the target plastic drift. Equating the plastic energy obtained from energy balance to external work done by the equivalent inertia forces considering, a total of 16 energy-based base shears for each frame are derived considering different combinations of modification factors. Ductility related parameters of modification factors are determined from pushover analysis. Relative input energy of multi degree of freedom (MDOF) system is approximated by using the modal-energy-decomposition approach. Energy-based design base shears are compared with those obtained from nonlinear time history (NLTH) analysis using recorded accelerograms. It is found that some of the energy-based base shears are in reasonable agreement with the mean base shear obtained from NLTH analysis.

• 대한기계학회논문집A
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• 제30권8호
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• pp.993-1000
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• 2006

Operating experience of steam generators has shown that cracks of various morphology frequently occur in the steam generator tubes. These cracked tubes can stay in service if it is proved that the tubes have sufficient safety margin to preclude the risk of burst and leak. Therefore, integrity assessment using exact limit load solutions is very important for safe operation of the steam generators. This paper provides global and local limit load solutions for surface cracks in the steam generator tubes. Such solutions are developed based on three-dimensional (3-D) finite element analyses assuming elastic-perfectly plastic material behavior. For the crack location, both axial and circumferential surface cracks, and for each case, both external and internal cracks are considered. The resulting global and local limit load solutions are given in polynomial forms, and thus can be simply used in practical integrity assessment of the steam generator tubes.

• 복식문화연구
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• 제25권3호
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• pp.327-339
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• 2017

A consumer is an individual entity with various motivations. This study is intended to incorporate a hierarchical structure of motivation to understand self-determined motivation for purchasing secondhand merchandise at thrift stores. A conceptual model adopted from Cadwallader et al. (2010)'s comprehensive model of motivation used in a marketing context was developed to investigate motivational process in secondhand merchandise shopping. The conceptual model includes the three levels of motivational structure-the global, contextual (environmental concern and frugality), and situational motivation. A series of the causal relationships among the three levels of self-determined motivations and buying intention to shop at thrift stores were hypothesized. A total of 219 respondents from two different northeastern state universities in the U.S. completed a self-administered survey. The results indicated that secondhand merchandise shopping is well explained in the hierarchical structure of self-determined motivation where the global motivation had a positive impact on the contextual motivations regarding environmental concern and frugality. Of the two contextual motivations, only environmental concern had a positive impact on situational motivation for shopping at thrift stores. Finally, the situational motivation positively influenced the intention to shop at thrift stores. The results of this model suggest that the hierarchical structure of self-determined motivation would be a very useful framework to understand consumer behavior for apparel shopping. Also, further research can be done to identify other contextual motivational factors to understand consumer motivation for shopping at thrift stores.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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• pp.361-365
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• 2006

High ionospheric spatial gradient during ionospheric storm is most concern for the landing approach with GNSS (Global Navigation Satellite System) augmentation systems. In case of the GBAS (Ground-Based Augmentation System), the ionospheric storm causes sudden increase of the ionospheric delay difference between a ground facility and a user (aircraft), and the aircraft position error increases significantly. Since the ionosphere behavior and the storm effect depend on geographic location, understanding the ionospheric storm behavior at specific regional area is crucial for the GNSS augmentation system development and implementation. Korea Aerospace Research Institute and collaborating universities have been developing an integrity monitoring test bed for GBAS research and for future regional augmentation system development. By using the dense GPS (Global Positioning System) networks in Korea, a regional ionosphere map is constructed for finding detailed aspect of the ionosphere variation. Preliminary analysis on the ionospheric gradient variation during a recent storm period is performed and the results are discussed.

• 한국정밀공학회지
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• 제17권1호
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• pp.216-223
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• 2000

A robot arm with free joints has some advantages over conventional ones. A light weight and low power consumed arm can be made by a reduction of the number of joint actuators. And this arm can easily overcomes actuator failure due to unexpected accident. In general such underactuated arm does not have controllability because of the lack of joint actuators. The two-link arm with a free joint introduced in this paper is also uncontrollable in the sense of linear system theory. However, the linearized system sometimes can not represent the inherent dynamic behavior of the nonlinear system. In this paper the dynamic characteristics of the two-link arm with a free joint in view of global motion including damping and friction effect of the joints is investigated. In the case of considering only the damping effect, the controllable goal positions are confined to a specific trajectories. But in the case of considering the friction effect, the system can be controlled to arbitrary positions using the friction of the free joint as a holding brake. Also numerical example of position control is presented.

• 한국재료학회지
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• 제31권2호
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• pp.84-91
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• 2021

To cope with automobile exhaust gas regulations, ISG and charging control systems are applied to HEV vehicles for the purpose of improving fuel economy. These systems require quick charge-discharge performance of high current. Therefore, a Module of the AGM battery with high energy density and EDLC(Electric Double Layer Capacitor) with high power density are constructed to study the charging and discharging behavior. In CCA, which evaluates the starting performance at -18 ℃ & 30 ℃ with high current, EDLC contributed for about 8 sec at the beginning. At 0 ℃ CA (Charge Acceptance), the initial Charging current of the AGM/EDLC Module, is twice that of the AGM lead acid battery. To play the role of EDLC during high-current rapid charging and discharging, the condition of the AGM lead-acid battery is optimally maintained. As a result of a Standard of Battery Association of Japan (SBA) S0101 test, the service life of the Module of the AGM Lead Acid Battery/EDLC is found to improve by 2 times compared to that of the AGM Lead Acid Battery.

• 한국벤처창업학회:학술대회논문집
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• 한국벤처창업학회 2007년도 춘계학술대회
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• pp.405-433
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• 2007

본 연구는 온라인 쇼핑몰의 쿠폰판촉이 소비자의 구매행동에 미치는 영향을 검증하였다. 분석 결과는 다음과 같다. 첫째, 쿠폰 인지정도에 따라서는 F-검증을 실시한 결과 쿠폰의 인지여부에 따라 쿠폰 제공시 사용의사와 쿠폰 제공시 재사용의사에서는 유의미한 차이가 있는 것으로 나타났다. 둘째, 쿠폰의 사용경험에 따른 구매행동의 차이를 전체적으로 살펴보면 쿠폰사용 경험이 있다가 없다보다 높은 평균을 보여 유의미한 차이가 있는 것으로 나타났다. 이러한 결과는 쿠폰 사용경험에 따라 구매행동에 차이가 있음을 시사하고 있다. 셋째, 구매행동과 쿠폰의 비용/편익 자각의 관계를 살펴보면 뚜렷한 정적 상관관계가 있는 것으로 나타났다. 이는 쿠폰의 비용/편익 자각이 높을수록 구매행동이 높아짐을 의미한다. 넷째, 구매행동은 쿠폰사용을 즐김과 쿠폰 사용습관과 가장 관계가 높음을 발견하였다.

• 한국콘텐츠학회논문지
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• 제13권11호
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• pp.699-713
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• 2013

본 연구의 구체적인 내용들은 다음과 같이 요약할 수 있다. 첫째, OCBI에 비해 OCBO의 수행동기는 보다 복잡 미묘한 양상을 보이고 있다. 즉 조직을 표적으로 한 OCBO의 경우가 동료들을 표적으로 한 OCBI에 비해 훨씬 다양한 수행동기들을 갖는 것으로 나타나고 있다. 둘째, OCBO와 OCBI는 서로 유사한 동시에 서로 상이한 수행동기들을 지니고 있다. 즉 사회심리기반 및 회피기반의 유사한 수행동기들이 발견되는 반면 OCBO의 의무기반 및 가치기반 대 OCBI의 기질기반이라는 상이한 수행동기들도 발견된다. 셋째, 기존의 수단기반형은 OCBO 및 OCBI의 연구결과들을 종합한다 해도 본 연구에선 반복적으로 확인되지 않고 있다. 넷째, P표본 간 일치진술문들에 있어서도 전반OCB를 고려하는 경우에 비해 보다 많은 진술문들이 발견되고 있다. 따라서 이상의 연구결과들은, 전반OCB가 아닌 OCB의 하위차원들을 각기 고려할 때 좀 더 적확한 수행동기유형들을 도출할 수 있음을 의미하는 동시에, 각 하위차원들이 서로 구별되는 독특한 본질을 지니고 있음을 시사하는 것으로 이해할 수 있다. 결국 이는 OCBO 및 OCBI 양자 간의 차이점을 일관성 있게 지적해 온 기존연구들의 주장에 부합하는 연구결과라 할 것이며, Q방법론은 이러한 OCB 각 하위차원들간의 독특성을 확인해 줄 수 있는 매우 유용한 방법론이 된다 할 것이다.