Diphenyl Methyl Phosphate와 Diphenyl Ethyl Phosphate의 합성 및 PET 직물에 대한 방염성

조환,이광우,조인술,허만우,조용석,장두상,김수창,Cho, Hwan,lee, Kwang-Woo,Cho, In-Sul,Huh, Man-Woo,Cho, Yong-Suk,Chang, Du-Sang,Kim, Soo-Chang 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.5

For the development of technology for durable flame retardant finish of PET fabrics, an experimental study was carried out, The following conclusions were drawn: 1. In the synthesis of diphenyl methyl phosphate(DPMP) and diphenyl ethyl phosphate(DPEP) which served as flame retardant for PET, the process using nitrogen current to expel HCl gas in the reaction system is practicable without the use of solution such as pyridine or tertiary amine. 2. DPMP and DPEP showed good flame retardancy effects. 3. PET fabrics treated with DPMP and DPEP were excellently durable to repeated washings and wet cure gave softer touch than dry cure.

발모광 아동에서 인지행동치료

조환일(Hwan Il Cho),도진아(Jin A Do),김연수(Yeon Soo Kim),임명호(Myung Ho Lim),김현우(Hyun Woo Kim) 대한소아청소년정신의학회 2009 소아청소년정신의학 Vol.20 No.3

Trichotillomania is a neuropsychiatric disorder characterized by repetitive pulling out of one’s hair. We present a trichotillomania case study illustrating the effectiveness of habit reversal training, which has recently been found, in western countries, to be a very effective cognitive behavioral treatment. The refractory patient in our study had previously received 1 year of drug treatment and psychiatric consultation for the disorder. We administered 10 habit reversal training sessions, which was followed by an obvious improvement in the patient’s trichotillomania symptoms. Our observations indicate that habit reversal training might be effective in the treatment of trichotillomania.

혼방섬유제품의 적외선분광학적 분석에 관한 연구(II) -A/N 혼방섬유제품의 정량분석-

조환,조용석,이광배,정원규,Cho, Hwan,Cho, Yong-Suk,Lee, kwang-Bae,Chung, Won-Kyu 한국섬유공학회 1971 한국섬유공학회지 Vol.8 No.2

Infrared spectroscopic analytical determinations of various acrylic, nylon and A/N blended fibers were investigated by potassium bromide pressed disc technique. Quantitative comparison was carried out on the commercial A/N blended samples with the IR technique and solvent method (KS K). The functional groups in blended fibers is easily detected by the use of characteristic absorption band. These spectra can be used to measure the content of blended fibers by using the ratio of NH stretching band (3070 cm-1) of Nylon and CN stretching band (2240 cm-1) of acrylic fibers. (Received Sept. 22, 1971)

제전성 합성섬유의 실험실적 제조

조환,허만우,정원규,Cho, Hwan,Huh, Man-Woo,Chung, Won-Kyu 한국섬유공학회 1979 한국섬유공학회지 Vol.16 No.1

In this paper, the details and preliminary results of the investigations were presented for the use of copolymers of polyamides containing disulfide linkages, sulfhydryl groups and sulfonic acid groups as antistatic agents for nylon 66 filaments. Copoly hexamethylene (3,3'-dithiodipropio-adipo) amide (copoly-HDA) was synthesized from 3,3'-dithiodipropionyl chloride, adipoyl chloride and hexamethylene diamine by an interficial polycondensation method. Conditions for synthesis of the copoly-HDA were discussed. The copoly-HDA and nylon 66 chips were mined in several component ratios and then spun by wet spinning method. The resulting filaments were treated with reducing and oxidizing agents in order to make hygroscopic filaments, Electro-specific resistance of those and nylon 66 filaments were measured in order to discuss their antistaticity. Antistatic effects of copoly-HDA were recognized on those filaments at room temperature, which could be explained by assuming that the disulfide arrangements were made pseudo-conjugated double bond.

Ethylene Glycol이 Poly(ethylene Terephthalate) 섬유의 알칼리 가수분해에 미치는 영향

조환,장두상,이석영,김영범,Cho, Hwan,Chang, Du-Sang,Lee, Suk-Young,Kim, Young-Beum 한국섬유공학회 1986 한국섬유공학회지 Vol.23 No.6

Poly(ethylene terephthalate)(PET) fabrics were treated with various concentrations of NaOH and ethylene glycol(EG) at different temperatures to investigate the effects of EG, which was produced during the hydrolysis of PET by NaOH. The dissolution rate constant was calculated by Kuriyama's equation. It showed a linear relationship to the concentration of NaOH and an exponential relationship to treating temperature the concentration of EG. Apparent activation energy of dissolution was 18.9-21.0 Kcal/mol and decreased slightly with increasing the concentration of EG but no relationship between the concentration of NaOH and apparent activation energy was noted. The tensile strength of NaOH treated filament decreased rapidly with the increase of weight loss and there was no difference between PET filament treated in ethylene glycolic and aqueous NaOH solutions. The density and crystallinity of treated PET increased with the increase of weight loss. It was more prominent in ethylene glycolic than in aqueous NaOH solution. More moisture regain was noted PET fabrics treated in ethylene glycolic NaOH solution in disregard of higher crystallinity, which was assumed to be due to hydrophilic characteristics of sodium carboxylate on the end of PET molecular chains. PET was swelled in EG three times more than in water under the same conditions. The dissolution rate constant in ethylene glycolic NaOH solution was seven to eleven times larger than in aqueous solution and the lower the concentration of NaOH was, the more the effect of EG was.

폴리에스테르 직물의 알칼리처리가공에 관한 연구

조환,이석영,장두상,최상화,Cho, Hwan,Lee, Suk-Young,Chang, Du-Sang,Choi, Sang-Hwa 한국섬유공학회 1982 한국섬유공학회지 Vol.19 No.6

A study has been made to determine if the hardness of treating and washing solution in the alkali treatment of polyester fabric affects its weight loss and ethylene glycol produced during the finishing affects the fabric's weight loss and breaking strength. The results are as follows: As the hardness of treating solution increases, the weight loss of polyester fabric decreases remarkably and insoluble precipitate sticks on its surface. When hard water is used as washing solution or weak acid used in neutralizing the fabric after alkali treatment, white powder sticks on the surface of the fabric. The weight loss of polyester fabric increases more when the fabric is treated in sodium hydroxide solution containing ethylene glycol than in the solution without ethylene glycol. The breaking strength decreases as weight loss increases, but it is almost constant at the same weight loss when the fabric is treated in the sodium hydroxide solution with or without ethylene glycol.

주의력결핍 과잉행동장애에서 아동행동평가척도, 아동인성검사, 주의력장애 진단시스템 : 주의력결핍 과잉행동장애의 진단에서 차원적 진단도구들의 역할

조환일,도진아,김현우,임명호,Cho, Hwan-Il,Do, Jin-A,Kim, Hyun-Woo,Lim, Myung-Ho 대한불안의학회 2009 대한불안의학회지 Vol.5 No.2

Objective : We investigated that ADHD categorical diagnosis and the dimensional tools for the evaluation of ADHD, widely used in the clinical field, such as the child behavior check list- Korean version (K-CBCL), Korean personality inventory for children (KPI-C), computerized Attention Diagnostic System (ADS). Method : The DSM-IV clinical diagnosis applied by child psychiatrist. K-CBCL, KPI-C, ADS are used. Ultimately, totally 161 ADHD children and 161 controls were evaluated. Subject group are consist of 202 boys (62.7%) and 120 girls (37.3%), and the mean age was $9.5{\pm}2.0$ years old. Results and Conclusion : Social problem, and attention problem in the K-CBCL, correct response time standard deviation in the computerized ADS were statistically significant different and attention problem in the K-CBCL, hyperactivity subscale in the KPI-C were significant trait, between subject group and control group. The ROC value of attention problem in the K-CBCL, hyperactivity subscale in the KPI-C, and ADS were .78, .93, .86. Finally, we found that K-CBCL, KPI-C, ADS were significant corelation with the ADHD categorical diagnosis.

제전성 수지가공법의 개발 및 그 응용

조환,김수창,권영호,정원규,Cho, Hwan,Kim, Soo-Chang,Kwon, Yeung-Ho,Chung, Won-Kyu 한국섬유공학회 1980 한국섬유공학회지 Vol.17 No.2

Investigations were made of the use of polyamides and polyamides containing disulfide linkages as antistatic resin finishing agents for polyester (PET), polyester/cotton (T/C, 65/35%) and nylon fabrics. The details and preliminary results are presented in this paper. The polyamides were synthesized from 3, 3' -dithiodipropionyl chloride (DTDPC), 2,2'-dithiodiglycolyl chloride (CTDGC) and diamines, and the polyimide was synthesized from DTDPC and apueous ammonia, both by interfacial polycondensation on the surface of fabrics. Frictional electrostatic voltages were measured by the rotary static tester to determine the degree of antistaticity. Antistatic effects of the polymers containing disulfide linkages were recognized on those PET and T/C, which could be explained by assuming that the disulfide arrangements were converted to pseudo-conjugated double bond patterns. A few samples of nylon fabrics showed increase, rather than decrease, in electrostatic voltage; the phenomena seem to be the result of intermolecular crosslinking of the nylon's active hydrogen with DTDPC and DTDGC. The measurement of breaking strengths of nylon specimens made to examine formation of crosslinking indicated that the strengths of highly antistatic specimens remained unchanged while those of low antistatic specimens dropped significantly.

혼방섬유의 적외선분광학적 분석에 관한 연구(I) -T/C혼방섬유의 정량분석-

조환,Cho, Hwan 한국섬유공학회 1971 한국섬유공학회지 Vol.8 No.1

Infrared absorption spectroscopic identifications of various cellulosic, polyester and T/C blended fibers were discussed in this paper. For this method the necessary amount of samples are very small, and identification of textile fibers is generally simple. Detection of functional groups in blended fibers is easily performed by the use of characteristic absorption band. The potassium bromide pressed disc technique was used to study the behavior of the T/C blended fibers in the infrared region. These spectra can be used to measure the content of blended fibers from the ratio of CH stretching band (2900cm-1) of cellulose to C=O stretching band (1720cm-1) of polyester fibers. Absorbance by chemical structures in fiber is function of the transparency of the potassium bromide disc. (Received March 10, 1971)

세드롤과 콜라겐 유래 펩타이드의 피부노화 개선효과

류종성 ( Jong Seong Ryu ),조환일 ( Hwan Il Cho ),원지희 ( Ji Hee Won ),전미나 ( Mi Na Jeon ),권오선 ( Oh Sun Kwon ),원보미 ( Bo Mi Won ),임준만 ( Jun Man Lim ),이상화 ( Sang Hwa Lee ) 대한화장품학회 2015 대한화장품학회지 Vol.41 No.3

피부 노화는 피부 표면에 나타나는 현상으로 피부 표면의 미세구조와 연관이 있다. 피부 미세구조의 변화는 주름형성, 피부 톤 저하 등 다양한 피부 노화 현상을 유발하는 요인이 된다. 본 연구는 주름 기능성 성분인 세드롤(Cedrol)과 콜라겐 유래 펩타이드 성분을 이용하여 시험관 수준(in vitro)에서 타입Ⅲ 콜라겐 합성 시너지 효과를 평가하였다. 여성 피시험자를 대상으로 4주 동안 상기 원료가 함유된 크림제품을 사용한 후 피부 미세 구조, 스타 형상(star configurations), 보습, 탄력, 피부 밝기, 윤기, 피부 톤, 투명도를 평가하였다. 시험관 수준의 세드롤과 펩타이드를 동시에 처리하면 우수한 수준의 타입Ⅲ 콜라겐 합성 시너지효과를 나타내었다. 그리고 크림제형을 이용한 인체적용 시험에서는 사용 4주 후부터 피부 미세구조, 스타형상, 윤기, 피부 톤, 보습, 탄력을 개선시켰으나, 피부 밝기 개선 효능은 나타나지 않았다. 본 연구를 통하여 기존 주름 기능성 성분인 세드롤과 콜라겐 유래 펩타이드는 세포 수준에서 타입Ⅲ 콜라겐 합성 시너지 효과가 있음을 확인하였고 이를 화장품에 적용하여 시험한 결과 피부 노화 개선에 도움을 주는 성분임을 확인하였다. Skin aging is the phenomena finally expressed on the skin surface and related to the changes in the microstructure of the skin texture. Which is resulted in wrinkle formation and uneven tone of skin and so on. In this study, the synergy effect of Cedrol and a collagen-derived peptide in type Ⅲ collagen synthesis was evaluated by in vitro test. The physiological skin state of 22 female volunteers was measured after using the cosmetics for 4 weeks. Results showed that Cedrol and a collagen-derived peptide had the excellent synergy effect in type Ⅲ collagen synthesis. The cosmetics improved skin microrelief, star configurations, skin gloss, skin tone, hydration and elasticity except skin lightening. In conclusion, this study proved that Cedrol and collagen-derived peptide had the synergy effect of type Ⅲ collagen synthesis in the cell level and cosmetics with those was improved skin aging in human volunteer test.