• 국제초고층학회논문집
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• 제1권4호
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• pp.283-300
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• 2012

Wind-induced vibrations of buildings can be perceived when movement of objects caused by the vibration is seen. However, movement of objects that would normally be expected to trigger visual perception of building vibrations is not necessarily seen in actual building environments. Therefore, to evaluate habitability to building vibrations, it is necessary to examine the influence of movement of objects on vibration perception taking into account probability of seeing the objects. As the first step in this study, those data necessary to estimate probability of vibration perception from seeing of swaying objects have been measured during normal activities in actual buildings. In addition, statistical analysis of the data has also been carried out. As the second step in this study, the probability distribution of vibration perception by visual sensation is estimated using the series of data measured in the first step. Probability of seeing object is considered in the estimated probability distribution.

• Current Optics and Photonics
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• 제2권3호
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• pp.269-279
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• 2018

We are currently investigating the feasibility of a 1.6 m telescope with a laser-guide star adaptive optics (AO) system. The telescope, if successfully commissioned, would be the first dedicated adaptive optics observatory in South Korea. The 1.6 m telescope is an f/13.6 Cassegrain telescope with a focal length of 21.7 m. This paper first reviews atmospheric seeing conditions measured over a year in 2014~2015 at the Bohyun Observatory, South Korea, which corresponds to an area from 11.6 to 21.6 cm within 95% probability with regard to the Fried parameter of 880 nm at a telescope pupil plane. We then derive principal seeing conditions such as the Fried parameter and Greenwood frequency for eight astronomical spectral bands (V/R/I/J/H/K/L/M centered at 0.55, 0.64, 0.79, 1.22, 1.65, 2.20, 3.55, and $4.77{\mu}m$). Then we propose an AO system with a laser guide star for the 1.6 m telescope based on the seeing conditions. The proposed AO system consists of a fast tip/tilt secondary mirror, a $17{\times}17$ deformable mirror, a $16{\times}16$ Shack-Hartmann sensor, and a sodium laser guide star (589.2 nm). The high order AO system is close-looped with 2 KHz sampling frequency while the tip/tilt mirror is independently close-looped with 63 Hz sampling frequency. The AO system has three operational concepts: 1) bright target observation with its own wavefront sensing, 2) less bright star observation with wavefront sensing from another bright natural guide star (NGS), and 3) faint target observation with tip/tilt sensing from a bright natural guide star and wavefront sensing from a laser guide star. We name these three concepts 'None', 'NGS only', and 'LGS + NGS', respectively. Following a thorough investigation into the error sources of the AO system, we predict the root mean square (RMS) wavefront error of the system and its corresponding Strehl ratio over nine analysis cases over the worst ($2{\sigma}$) seeing conditions. From the analysis, we expect Strehl ratio >0.3 in most seeing conditions with guide stars.

• 보건의료산업학회지
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• 제7권3호
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• pp.83-93
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• 2013

This study was conducted on 350 students of health and medical department of universities in Busan from June 3, 2013 to June 21, 2013, and a total of 350 questionnaires were researched. Among them 337 responses were used after 13 unfaithful responses were excluded. The effects of oral health belief on use of dental service of students of health and medical department of universities were examined and analyzed to provide basic data which can be used to expand understanding about oral health belief, to promote changes in behaviors regarding oral health and to improve oral health of the public. Collected data was analyzed through SPSS (Statistical Packages for Social Science 15.0. SPSS Inc. USA). For verification of differences of oral health belief depending on general matters and oral health behavior, t-test and ANOVA analysis were conducted, and for examination of the effects of oral health belief on use of medical service, logistic regression and regression analysis were conducted. The study results suggest that those who had higher sensitivity among oral health belief variables had higher probability of needing dental treatment and seeing the dentist immediately. And those who showed higher sensitivity and importance had higher frequency of seeing the dentist for six months. Future studies need to be conducted on the methods to change oral health belief for sustainable and systematic oral health enhancement in consideration of the factors affecting oral health belief and oral health behavior of the students of dental hygiene department.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권10호
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• pp.4766-4786
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• 2016

Looking for missing companions who are out of touch in public places might suffer a long and painful process. With the help of mobile crowdsourcing, the missing person's location may be reported in a short time. In this paper, we propose MissingFound, an assistant system that applies mobile crowdsourcing for finding missing companions. Discovering valuable users who have chances to see the missing person is the most important task of MissingFound but also a big challenge with the requirements of saving battery and protecting users' location privacy. A customized metric is designed to measure the probability of seeing, according to users' movement traces represented by WiFi RSSI fingerprints. Since WiFi RSSI fingerprints provide no knowledge of users' physical locations, the computation of probability is too complex for practical use. By parallelizing the original sequential algorithms under MapReduce framework, the selecting process can be accomplished within a few minutes for 10 thousand users with records of several days. Experimental evaluation with 23 volunteers shows that MissingFound can select out the potential witnesses in reality and achieves a high accuracy (76.75% on average). We believe that MissingFound can help not only find missing companions, but other public services (e.g., controlling communicable diseases).

• 산업경영시스템학회지
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• 제39권3호
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• pp.170-179
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• 2016

In this paper we have tackled the outstanding inventory planning problems over new product launching period in a more holistic manner by addressing first the definition of efficient business rules to effectively control and reduce the inventory risks followed by the rigorous explanations on the implementation guide on suggested inventory planning rules. It is not unusual for many companies in the consumer electronics market to make a great effort to reduce the time to launch a new product because the ability to bring out higher performing products in such a short time period greatly increases the probability for them to remain competitive in the high tech market. Among so many newly developed products, those products with new features and technologies appeal to many potential customers while products which fail to win customers by design and prices rapidly disappear in the market. To adapt to this business environment, those companies have been trying to find the answer to minimize the inventory of old products so they can move to next generation products quickly with less obsolete material. In the experimental implementation of our rule-based inventory planning, Company 'S' reduced the inventory cost for the outgoing products as low as 49% of its peak level of its preceding product version in just 5 month after the adoption of rule-based inventory planning process and system. This paper concluded the subject with a suggestion that the best performance of rule-based inventory planning is guaranteed not from one-time campaign of process improvement along with system development but the decision maker's continuing support and attention even without seeing any upcoming business crisis.

• 한국의류산업학회지
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• 제24권5호
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• pp.647-654
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• 2022

Wearable devices come in a variety of shapes and sizes in numerous fields in numerous fields and are available in various forms. They can be integrated into clothing, gloves, hats, glasses, and bags and used in healthcare, the medical field, and machine interfaces. These devices keep track individuals' biological and behavioral data to help with health communication and are often used for injury prevention. Those with hearing loss or impaired vision find it more difficult to recognize an approaching person or object; these sensing devices are particularly useful for such individuals, as they assist them with injury prevention by alerting them to the presence of people or objects in their immediate vicinity. Despite these obvious preventive benefits to developing Internet of Things based devices for the disabled, the development of these devices has been sluggish thus far. In particular, when compared with people without disabilities, people with hearing impairment have a much higher probability of averting danger when they are able to notice it in advance. However, research and development remain severely underfunded. In this study, we incorporated a wearable detection system, which uses an infrared proximity sensor, into a backpack. This system helps its users recognize when someone is approaching from behind through visual and tactile notification, even if they have difficulty hearing or seeing the objects in their surroundings. Furthermore, this backpack could help prevent accidents for all users, particularly those with visual or hearing impairments.

• 경영과학
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• 제27권2호
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• pp.81-95
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• 2010

There is an increasing interest in contents such as movie, drama and game using transmedia storytelling. It includes Le Grand Chef, The War of Flower, Dae Jang Geum, The Matrix, Harry Potter and The Lord of the Rings. However, transmedia contents have not always been successful. To study the factors affecting possible outcomes of transmedia storytelling, we analyzed the intention on transmedia of potential consumers who have not been exposed to transmedia contents before. To this end, we investigated two different cases : first, potential customer intention to watch dramas which will be produced after launching comic-based movies; second, potential customer intention to see movies which will be made after broadcasting comic-based TV dramas. In each case, we analyzed the outcomes from potential customers by applying several variables including gender, exposure to the original and components of contents (plot, quality of act and music etc). Our study showed that potential customers prefer movies or TV dramas with quality of acting, directing, casting and storylines. Interestingly, the quality of acting is more important in dramas than in movies and casting is an appealing factor to potential customers in movies. In TV drama cases, potential customers have high watching intentions when they read the original content. Among them, male potential customer have low watching intentions on TV drama when they did not read the original content. However, female potential customers have high watching intentions on TV drama regardless of the previous exposure to the originals. In movie cases, female potential customers have higher intentions on seeing movies than male. These results suggest that one needs to consider several factors such as casting, acting and gender for generating transmedia contents with a high probability of success.

• 한국산학기술학회논문지
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• 제21권11호
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• pp.264-272
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• 2020

본 연구에서는 농촌지역으로 귀농한 새로운 농업경영체들이 안정적으로 영농에 정착할 수 있는 방안을 모색하기 위해 '농지'를 중심으로 이주 후 정착단계에서의 애로사항과 정보제공 방안을 모색하였다. 이를 위해 본 연구에서는 이변량 프로빗 모델을 활용하였다. 연구결과, 첫째, 귀농인이 이주 후 정착단계에서 농지확보의 어려움과 농지정보 제공 수요는 강한 양(+)의 상관관계가 있다. 따라서 정착단계에서 농지확보의 어려움을 겪고 있는 귀농인들에게 농지정보제공을 통해 이들의 농지수요에 적극적으로 대응할 필요가 있다. 둘째, 젊은 귀농인의 경우 정착단계에서 농지확보의 어려움을 겪을 확률이 증가한다. 셋째, 청년농업인이 농업발전가능성을 보고 귀농한 경우 정착단계에서 농지확보의 어려움을 겪을 가능성은 감소하고, 비록 통계적 유의성은 없지만 농지정보수요 역시 감소하는 것으로 분석되었다. 넷째, 향후 영농규모 확대 의향이 있는 경우 정착단계에서 농지확보의 어려움이 있고, 농지정보 수요 역시 증가하는 것으로 나타났다.

• 한국전자통신학회논문지
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• 제13권2호
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• pp.397-404
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• 2018

인터넷 사용이 증가함에 따라 많은 사용자 행위가 로그 파일에 기록되고, 최근에 이들을 이용한 연구와 산업이 활성화되고 있다. 본 논문은 오픈 소스 기반 분산 컴퓨팅 플랫폼인 하둡을 사용하고, 로그 파일에 기록된 사용자 행위를 분석하여 맞춤형 관광 정보를 제공하는 시스템을 개발한다. 제안된 시스템은 사용자들이 검색한 웹사이트로부터 로그 파일을 얻기 위하여 구글의 Analytics를 사용하고, 하둡의 MapReduce를 사용하여 검색 항목을 추출하여 HDFS에 저장한다. Octopus 프로그램을 사용하여 여행안내 웹사이트로부터 여행관련 관광지나 도시에 대한 정보를 모으고, MapReduce를 사용하여 관광지의 특징을 추출한다. 그리고 관광지의 특징과 사용자 검색항목을 매칭하여 사용자에게 관광하고 싶은 맞춤형 도시를 제안한다. 본 논문에서는 매칭의 확률을 높이기 위하여 NBP(next bit permutation)알고리즘을 사용하여 검색항목과 관광지 특징을 재정렬하는 기법을 도입한다. 그리고 개발된 시스템의 효용성을 확인하기 위하여 39 명의 사용자에 대한 로그 데이터를 분석하여 맞춤형 관광도시를 제안한다.

• 한국시조학회지:시조학논총
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• 제19권1호
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• pp.179-205
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• 2003

The purpose of this study is about to consider the structure of dualistic recognition between "Gang-Ho"(ideal sanctuary) and real world in the "Songs of Fisherman" written by Lee Hyeon Bo. In order to do this job, I analized the arrangement of the contents and extract the exact in and outward meaning of elements and expressions; usage of them between lines of this Song. Based on these works, I tried to explain the confronted recognitions of the two worlds. At the first, about the arrangement and contents of this poem, It is consisted of 5 independent sub-poems and each of them are describing the value of fisherman's life(at the poem 가), separation from mundane world(나), satisfaction of fisherman's life(다), nature of "Gnag-Ho"(라), domiciliation in the place(마). It looks like that the writer intended to have the arrangement probability and likelihood connecting poems. Secondly, It contrast the nature of the "Gang-Ho" and real world. The sanctuary is a place of 'absence of worldly desire' and 'cordiality' that could afford one's harmonious life. On the other hand, the real world is a troublesome place which always conflicts political confrontations. For those reasons, the writer wants to satisfy with his living in "Gang-Ho" separating himself from the real world. Thirdly, The nature of "Gang-Ho" is 'absence of worldly desire' and 'cordiality' that one could be deserved his diligency becoming a part of the harmonious idealistic living place. Fourthly, on the character of story teller. Originally he is a incomer of "Gang-Ho" from real world. so that reason, he is showing dualism not to deny the loyalty oath to his king, while he intends to satisfy with the life in "Gang- Ho" separating himself from real world. As a gentry, at that time, the loyalty oath is inevitable one and that is found from writer's other works either. Fifthly, Characters of the different world recognition. The main reason of his intention to "Gang-Ho" roots on out of worldly confrontations, his separation from real world is on a joyous peaceful life just like in "Gang-Ho". this study believes the writer imply that 'absence of worldly desire' and 'cordiality' of "Gang-Ho", be a key role to resolve the confrontation of real world. Lee Hyeon Bo himself regards the two elements as a advisable attitude of life. At last, Seeing the writer's other work and literature's educational effect, this study defines that even if the poem outwardly express one's lyricism but inside it warns governors ruling attitude.