기능성 쌀 수요분석

조재환 한국농업정책학회 2005 농업경영정책연구 Vol.32 No.4

The objective of this paper is to find out the factors which influence to purchase the functional rice. The data used in demand modeling are characterized by the fact that the functional rice consumption is zero in the case of a lot of household during the survey period. Therefore, limited dependent variable models are used to determine factors influencing on functional rice demand. Of limited dependent variable models, tobit model is proved to provide a better representation of analysing functional rice purchase behavior. Results indicate the level of the perception and confidence on the functional rice, and the careful concern of the new rice products are significant determinants of consumption level with the household income variable. The results of this paper could be an important information for establishing the functional rice marketing strategy effectively.

전통 곶감의 수출시장 소비자선호 분석

조재환,김태균,박준형 한국농업정책학회, 한국축산경영학회 2001 농업경영정책연구 Vol.28 No.3

This study analyzes the foreign consumers' preferences and the willingness to pay for the Korean traditional dried persimmons by conducting surveys to Japanese, Americans, Canadians, Europeans, Australians, and New Zealanders. The results show that the potential export demand is largest to Japanese and those to U.S. and Europe are sufficient. The results also indicate that the price has to be reduced and the quality has to be improved in order to extend the export demand for the Korean traditional dried persimmons.

산업재해(건설업)에 따른 안전교육 실태분석에 관한 연구 : G 건설사 사례를 중심으로

조재환 대한안전경영과학회 2010 대한안전경영과학회 학술대회논문집 Vol.2010 No.1

열가역성 고분자겔과 기능섬유

조재환 한국섬유공학회 1993 한국섬유공학회지 Vol.30 No.3

고분자/유기저분자계에서의 분극과 물성

조재환,김창경 한국섬유공학회 1993 한국섬유공학회지 Vol.30 No.5

Thermal, structural and morphological characteristics were investigated in the unpoled and poled polymer/organic low weight molecule systems, that is. p-nitroaniline(p-NA) and 2-methyl-4-nitroaniline (HHA)/poly(ethylene oxide) (PEO) films. Good P-HA/PEO and HHA/PEO films could be obtained from the mixtures having 50% p-NA or less. and the films containing 30% P-NA or less could be drawn. Differential scanning calorimetric measurements showed not only two strong melting peaks due to the melting of P-NA and PEO crystals but also a weak melting peak due to the interaction of two components. p-NA and MNA crystals were observed to have a short bar structure, whereas p-NA/PEO films were observed to have an entangled structure. Poling of P-HA/PEO films caused a good reorientation of p-HA crystals observed with the scanning electron microscope but such a phenomenon was not shown in the MNA/PEO films. A significant change of X-ray diffraction peaks appeared for the poled P-HA/PEO films.

나일론 6 용액의 비등온 열가역적 겔화거동과 겔방사

조재환,김정대 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.9

Thermoreversible nylon 6 gels were prepared in benzyl alcohol (BA) solution and in the mixture solution of BA and formic acid(FA). The non-isothermal gelation behavior and the properties of fibers gel-spun from the solution were investigated. The isothermal and non-isothermal sol-gel transition temperatures measured using a test-tube tilting method and differential scanning calorimetry (DSC), respectively were compared. The sol-gel transition temperature of the solution on cooling varied largely with cooling rate, and it was much lower than that in the isothermal condition. However the sol-gel transition temperature determined by extrapolating to the cooling rate at 0 $^{\circ}C$/min was very close to the isothermal value. Investigation of dependence of gel forming enthalpy on the cooling rate revealed the gelation of nylon 6/BA solution resulted in polymer crystallization. The experimental gelation time decreased with increasing cooling rate, which agreed relatively well with that calculated using an Arrhenius equation. The gelation behavior for BA/FA mixture solution was dependent on the volume fraction of BA as well as polymer concentration. As the volume fraction of BA increased, the critical polymer concentration for gel-forming was lowered. The gelation time in mixed solution was associated with the volume fraction of FA. The mechanical properties of gel-spun fibers were affected by coagulating temperature. The tenacity decreased with increasing coagulating temperature, but the modulus increased due to the increase of crystallinity.

비닐리덴플루오라이드-테트라플루오로에틸렌과 비닐리덴플루오라이드-헥사플루오로아세톤 공중합체의 블렌드의 강유전 상전이

조재환,김상용,Seizo Miyate 한국섬유공학회 1992 한국섬유공학회지 Vol.29 No.5

The ferroelectric phase transition was investigated in the blends of vinylidenefluoridetetrafluoroethylene (VDF-TFE) and vinylidenefluoride-hexafluoroacetone(VDF-HFA) copoly-mers using X-ray diffraction, infrared spectroscopic and differential scanning measurements. All the samples prepared except pure VDF-HFA copolymer showed the ferroelectric transition well. The ferroelectric-paraelectric phase transition temperature was over a broad temperature range and complete transition finished with its melting. The transition from ferroelectric phase to paraelectric seemed to occur without passing through the intermediate phase which was shown in vinylidenefluoride-trifluoroethylene copolymer. The paraelectric-ferroelectric phase transition of blends was found only at a cooling rate less than at least 5˚C/min from the melt and this transition was due to that of VDF-TFE copolymer because of crystallization behavior in the blends.

고속도로 터널 내 화재사고 발생 시 대피행동 지연 요인에 관한 연구

조재환 대한안전경영과학회 2022 대한안전경영과학회지 Vol.24 No.4

This paper attempted to analyze the correlation between the risk image of the evacuees in the tunnel and the variables that affect the evacuation behavior due to the closed feeling. As to whether there is a difference in the level of recognizing the tunnel risk image according to the distribution of jobs, the null hypothesis was rejected at the significance probability of 0.002, so it can be said that the level of recognition of the tunnel risk image varies depending on the job group. In the distribution difference between gender and tunnel risk image recognition level, the significance probability was 0.012, indicating that the null hypothesis was rejected, indicating that the tunnel risk recognition distribution according to gender was different. As a result of analyzing the distribution difference between the tunnel's closed feeling and the tunnel risk perception level, the significance probability was 0.001, and the null hypothesis was rejected, indicating that there was a difference in the tunnel risk image level.

건설안전시스템 향상을 위한 안전컨설팅 연구

조재환,한광일,윤준선 대한안전경영과학회 2013 대한안전경영과학회지 Vol.15 No.4

Neuropathic Pain after Spinal Surgery

조재환,이재협,송광섭,홍재영 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.4

Neuropathic pain after spinal surgery, the so-called failed back surgery syndrome (FBSS), is a frequently observed troublesome disease entity. Although medications may be effective to some degree, many patients continue experiencing intolerable pain and functional disability. Only gabapentin has been proven effective in patients with FBSS. No relevant studies regarding manipulation or physiotherapy for FBSS have been published. Spinal cord stimulation (SCS) has been widely investigated as a treatment option for chronic neuropathic pain, including FBSS. SCS was generally accepted to improve chronic back and leg pain, physical function, and sleep quality. Although the cost effectiveness of SCS has been proved in many studies, its routine application is limited considering that it is invasive and is associated with safety issues. Percutaneous epidural adhesiolysis has also shown good clinical outcomes; however, its effects persisted for only a short period. Because none of the current methods provide absolute superiority in terms of clinical outcomes, a multidisciplinary approach is required to manage this complex disease. Further studies concerning the etiology, diagnosis, treatment, and cost effectiveness of FBSS are warranted to deepen our understanding of this condition.