• Korean Journal of Agricultural Science
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• v.14 no.2
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• pp.263-271
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• 1987

The cyclical trend and seasonal variations of chestnut prices have been analyzed to find out the chestnut price fluctuation in Korea during 1966-1985. The optimum prices, production, and plantation area for the next twenty five years (1986-2010) have been forcasted by the derived equation models. The results of study can be summarized as follows: 1. The chestnut prices were increased by 14.67 percent per annum during 1966-1972, an d decreased by 9.24 percent during 1973-1985, due to the excessive production of chestnut. 2. The chestnut prices showed the lowest price during the harvesting season, especially in October (89.1), and highest in July (109.1). Seasonal fluctuation of chestnut prices were 0.0837 (C.V value) during 1966-1975, and 0.0706 during 1976-1985. Such a seasonal fluctuation of chestnut prices tends to be even with the passage of time. 3. The equation model of predicted chestnut prices was derived as follows : PR=117788.088 - 7.60 TC/Pop + 6.585 GNP/Pop The chestnut prices will be the lowest in 1988, but increased rapidly thereafter. 4. The equation model of optimum chestnut production was derived as follows : $${\ell}n\;PD/Pop=-8.5147-0.8267{\ell}n\;PR+3.3063{\ell}n\;GNP/Pop$$ To maintain optimum chestnut prices according to this model, chestnut production should be 133,000 ton for 1988, and 1,899,000 ton for 2010. 5. Optimum chestnut plantation area will be 4,000 ha in 1988, and thereafter total plantation area will be up to 57,400 ha in 2010.

• Journal of Fashion Business
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• v.17 no.3
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• pp.58-73
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• 2013

In China, the phenomenon called 'Korean Wave' has boosted the interest in Korean pop culture, such as TV drama, music and films, and even in the general culture and society. As Korean singers, movie actors and talents become popular beyond acceptance of public culture, those who learn Korean, buy Korean products and visit Korea have emerged. Especially, most Chinese women have used Korean hair cosmetics and the interests in Korean hair cosmetics are increasing, since cosmetic companies entered China early due to Korean wave. Thus, the status of purchase of Korean hair cosmetics is growing day by day in China. In particular, since the environment is established to buy hair cosmetics easily in Myeong-dong which is one of the shopping tourism special districts, many Chinese tourists are crowded there. Based on such phenomenon, this study explored the differences in perceptions towards 'Korean Wave' among Chinese tourists who purchased Korean hair cosmetics in Myeong-dong, and analyzed the factors that largely determine the interest in Korean hair cosmetics and their purchase behavior. Therefore, this study is aimed at contributing to the development of hair cosmetics products and the market amid Korean Wave. As the research methods, 100 answered questionnaires were collected with target of Chinese tourists at 20s and 40s who purchased Korean hair cosmetics in Myeong-dong once 120 questionnaires were distributed. In-depth analysis was conducted and final research data were used. It was confirmed that Korean fever positively affected the Chinese tourists' purchase behavior and satisfaction of hair cosmetics, and the interests in Korean hair cosmetics at 20s were higher than at 40s. People at 20s had higher awareness, satisfaction and intention of repurchase of hair cosmetics compared rather than people at 40s. The research confirmed that Chinese tourists are very interested in Korean hair cosmetics as the pop music craze has led to the general Korean Wave, and differences in such perceptions have led to significant differences in the product purchase behavior.

• Korean Journal of Digital Imaging in Medicine
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• v.11 no.2
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• pp.59-62
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• 2009

The purpose of this study is to know about solution of insecurity sense for solving the tediousness and inducing comfortableness in long time MRI examination. Studies were examined with total of 117 patients that the intention expression of self is possible for a month without dividing man and woman in november 2006. Examination methods were filled in questionnaire after testing using Siemens Impact 1.0T. The musical art were selected through intranet search and record sale inquiry using CD player and speaker. That kind of a music were selected with Korean classical music's 10 chapter, pop song 10's chapter, classic's 10 chapter and Korean popular song's 10 chapter. With analytical method, patients of under 40 year-old, or older and patients using ear-pad and head-phone were classified into groups. As analysis result with question item of questionnaire, most of the patients were showed a favor(36.72%) in playing a music, specially, examination of about 15.38% which uses the headphone prefer a music as older generation of over 40 year-old. In conclusion, with installing of the professional musical program in MRI test rooms, if listening to the music with selection by oneself before testing by season, age, time through development of appropriate musical program will be able to expect the more effect.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.205-205
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• 2012

Korea Superconducting Tokamak Advanced Research (KSTAR) 장치는 국내 유일의 초전도 자석을 이용한 핵융합 연구 장치로서 초고온의 플라즈마를 생성하여 차세대 에너지원인 핵융합 에너지를 획득하는 것을 목표로 두고 있다. 플라즈마를 생성부터 유지하기 위해서는 수소 동위원소를 토카막 내부로 공급해 주어야 하는데 이러한 수소동위원소를 "연료"라 부르며, 이 연료를 토카막 내부로 공급해 주는 시스템을 연료주입 시스템(Fueling System)이라고 한다. KSTAR에서는 토카막 내부로 고속의 연료 주입이 필요하고 정밀한 양의 연료를 공급하는 밸브를 사용하여야 하며, 이러한 밸브를 제어 할 수 있는 제어기를 필요로 한다. 위의 사항에 적합한 피에조 밸브(Piezoelectric Valve)는 2 msec 이내의 개폐시간과 500 Torr ${\ell}$/s 이상의 유량을 흘려줄 수 있는 피에조 밸브로 압전소자에 가해지는 전압(0~250 V)에 따라 변위의 양에 비례하여 연료가 진공용기 내로 유입된다. 압전소자의 변위는 최대 140 ${\mu}m$로 최적화되어 있어야 하며, 정전용량(Capacitance)는 30~40 nF이어야 한다. 또한 소자에 힘(Force)를 가해 최대 7 N으로 136 ${\mu}m$의 변위를 가진 소자를 사용해야 한다. 피에조 밸브의 특성으로는 아날로그 신호로 작동이 되어야 하며, 유량신호를 피드백하여 밸브의 구동 전압을 정밀하게 제어 되어야 한다. 피드백 제어를 위해 압력센서는 XCS-190 Series를 사용하여 낮은 유량에서도 민감하게 반응하도록 제작하였으며, 고전압이 유기 되었을 때 제어기를 보호하기 위한 정션박스를 설치하였다. 밸브 제어기는 피에조 밸브의 개방 속도를 높이기 위해 밸브 구동 전압을 순간적으로 높이는 POP 전압을 생성하는 기능과 유량 신호를 피드백해서 밸브 구동 전압을 정밀 제어 하는 기능을 가지고 있다. 제어장치는 아날로그 및 디지털 제어회로의 전원용 +15 V DC와 밸브 구동용 +250 V DC 출력용의 전원 공급 장치(Power supply unit), 펄스 및 트리거 신호를 생성하는 Master Programmer unit), Pop 전압과 피드백의 중요한 기능을 수행하는 Valve controller unit로 제작 되었다. 피에조 밸브와 제어기는 상호 작용하여 동작을 원활히 할 수 있도록 특성 실험을 진행하여야 하며, 진공상태에서 Lack의 유무를 확인하여야 한다. 현재 개발 제작된 밸브의 진공누설시험 및 특성실험을 진행하고 있으며, KSTAR 5차 캠페인에 적용할 계획이다.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.28 no.1
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• pp.51-61
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• 2023

Sound can travel a long distance in the ocean; hence, acoustic instruments have been widely used for ocean observations in various fields such as bathymetric survey, object detection, underwater communication, and current measurements. Herein we introduce a pressure-recording inverted echo sounder (PIES) which is one of the most powerful instruments, moored at seafloor for ocean observation in physical oceanography. The PIES can measure various kinds of oceanic phenomena (currents, mesoscale eddies, internal waves, and sea surface height variabilities) and support acoustic telemetry and pop-up data shuttle (PDS) system for remote data acquisition. In this paper, we review uses of PIES and describe present and prospective system of PIES including remote data acquisition toward (quasi) real-time data recovery.

• Proceedings of the KSPS conference
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• 2000.07a
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• pp.283-300
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• 2000

This paper is intended to suggest how to improve Korean high school students' awareness of the pronunciation in order to foster communicative effectiveness. Initially it is focused on the tasks of listening to the suprasegmental aspects. The strategies used in the listening process are (1)discerning intonation units, (2)recognizing rhythm pattern, and (3)identifying contraction and linking in connected speech. The tasks including in each process are listening discrimination, guided practice activity, and listening and speaking activity. The teacher should avoid methods which yield discouraging outcomes and try to help students enjoy experience of success in doing exercises and activities. So I suggested: students put the slash on the pause perceptible to chunk the stream of speech into the intonation units, and mark the content words to internalize English rhythm. And then I suggested that students listen to pop song English in order to improve the awareness of function words and connected speech in the intonation unit.

• Journal of Digital Contents Society
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• v.18 no.6
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• pp.1025-1032
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• 2017

Recently the domestic popular song market has been growing mainly in digital sound sources. As a result of analyzing the top 100 music charts from 2012 to 2016 through digital sound sources and musical scores, the average annual BPM has fallen by 11.26 over five years. Every year, The style of music has diversified every year, and the proportion of Hip-hop has doubled from 8.5% in 2012 to 17.8% in 2015. Dance music and ballads have a high preference rate, but the relationship is inversely proportional. Singer composition was inversely proportional to the ratio of female solo to male group. Especially, the relationship between BPM and the Major/Minor key is that 81.42% for slow tempo songs is Major key and 53.85% for fast tempo songs is minor key. In the case of TV drama OST, the solo singer 's music was preferred, the music style was 80% pop and 20% ballad.

• Korean Security Journal
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• no.33
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• pp.163-195
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• 2012

Various kinds of performances and events have been held by local governments along with the worldwide popularity of K-pop, and there is a growing concern about possible accidents. Actually, a large-scale of accident took place during the MBC pop song concert in Sangju Sports Stadium in October 3, 2005. And another great safety accident occurred during an open event in the Lotte World in Seoul in March 26, 2006. The purpose of this study is to propose improvement of security company that carry out security activity through the analysis of the cases of accidents and common causes in the event sites. The improvement of safety management for large-scale event site by the study are as followings; First, institutional measures should be taken to extend the size of private security companies. Second, more education and training should be provided for security personnels who work for the event. Third, private security companies should prepare for the security measures more thoroughly in advance. Fourth, private security companies should make every possible effort to maintain order in the event site. Fifth, private security companies should bolster their collaboration with relevant organizations. Sixth, security companies should take actions to make themselves completely ready for any possible unexpected situations.

• Journal of Fashion Business
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• v.8 no.6
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• pp.123-136
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• 2004

The purpose of this the end of 20th century fashion about various phenomenon of distopia. This study have the analysis and consideration through the elements and peculiarity of distopia. This study give us the various figures of distopia st fashion as well as the common features of distopia. The study method refers to sundry records, thesis, fashion magazine, publication, the collection works and internet. It is as follows. 'Distopia' prefix to dis of Utopia and means unknown future. Distopia trends towards future negatively. The end of 20th century, it is well brought out various cultures. Movie, novel and pop culture have effect on end of the 20th fashion with a view of distopia. It is the fear and uncertainty of the future. The characters of distopia through the works are divided into formative characteristics and aesthetics meaning. The future fashion of distopia expression mixed and various cultural life, also the mixed of utopia and distopia fashion. Distopia stimulates the designers to the new expression and expose their new areas.

• Journal of the korean academy of Pediatric Dentistry
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• v.32 no.4
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• pp.595-603
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• 2005

Incomplete removal of bacteria contaminated dentin or enamel associated with caries is a potential problem in restorative dentistry Secondary or residual caries, pulpal inflammation and hypersensitivity may result from bacteria left after the initial preparation, especially if an adequate seal against microleakage is not obtained. A possible solution to eliminate residual bacteria left in a cavity preparation would be to treat the cavity with cavity disinfectant wash. But a potential problem with using a cavity disinfectant with dentin bonding agents could be their interference with the ability of the resin to bond to the tooth micromechanically. The purpose of this study was to evaluate the effect of 2% chlorhexidine containing cavity disinfectant ($Consepsis^{(R)}$) on shear bond strength and microleakage of dentin bonding agents, $Adper ^{TM}$ $Scotchbond^{TM}$ Multi-Purpose, $Adper^{TM}$ Single Bond and $Adper^{TM}\;Prompt^{TM}\; L-Pop^{TM}$ Sixty and sixty sound human third molar teeth, respectively, were used for shear bond strength and microleakage test. For experimental group, cavity disinfectant was applied before dentin bonding agents, and was not applied for the control group. The result from the this study can be summarized as follows ; 1. Use of 2% chlorhexidine containing cavity disinfectant($Consepsis^{(R)}$) does not significantly affect the shear bond strength of dentin bonding agents. 2. Use of 2% chlorhexidine containing cavity disinfectant($Consepsis^{(R)}$) does not significantly affect the microleakage of dentin bonding agents.