Influence of Electron Beam Irradiation on the Thermal, Mechanical, and Electrical Properties of Polyethylene/Multiwalled Carbon Nanotube Nanocomposite Films

유태종,김병남,정영규,Yoo, Tae Jong,Kim, Byungnam,Jeong, Young Gyu The Korean Fiber Society 2015 한국섬유공학회지 Vol.52 No.6

We report the effects of electron beam (EB) irradiation on the thermal, mechanical, and electrical properties of nanocomposite films, based on polyethylene (PE) and multiwalled carbon nanotubes (MWCNTs), manufactured by solid mixing and melt-compression. For this purpose, the MWCNT content in the nanocomposite films was controlled to 1-10 wt% and the EB irradiation dose was 1-150 kGy. It was found that the melting temperature and enthalpy of pristine PE and its nanocomposite film were improved on using low EB doses of 1 and 10 kGy because of irradiation-induced heating and crosslinking. In contrast, high EB doses of 50 and 150 kGy led to significant reduction in the melting temperature and enthalpy as well crystallization temperature and enthalpy of the films because of chain scission or degradation. The electrical resistivity of the nanocomposite films decreased from ${\sim}10^{10}$ to ${\sim}10^1{\Omega}\;cm$ on increasing the MWCNT content, and regardless of the EB irradiation dose, electrical percolation of MWCNTs in the PE matrix was attained at a MWCNT content between 3 and 5 wt%. Accordingly, PE/MWCNT nanocomposite films with low electrical resistivity of $10^2-10^1{\Omega}\;cm$, which were subjected to moderate EB irradiation doses, exhibit excellent electric heating behavior, which depends on the applied voltage and MWCNT content.

온라인 서비스 기업 중심의 정보 보안 체계 수립에 관한 연구

유태종(Yoo, Tae Jong) 한국서비스경영학회 2015 서비스경영학회지 Vol.16 No.3

With the emergence of IT(Information Technology), the application of IT infrastructure and Online service becomes a critical success factor for business survival. However, it causes the serious threat to security since it covers from the firm"s confidential information to the customer"s private information. Recently, the convergence of a technical security and a managerial security has been emphasized. From the managerial security perspective, this research proposed the roll of the part in Mintzberg"s organizational structure for the establishing of the successful security management. With the de-facto standard: ITSM(Information Technology Service Management), the parts of organizational structure were mapped as follows: 1) ITSM main component, 2) ITSM construction phase, and 3) ITSM/ITIL(Information Technology Infrastructure Library) security item. Through the case study of online service firms, the security management of the proposed research is underpinned.

Active MA 포장이 신선편이 파프리카 저장성에 미치는 영향

유태종(Tae Jong Yoo),정현진(Hyun Jin Jung),손진성(Jin Sung Son),이스람모하메드조히를(Mohammad Zahirul Islam),김일섭(Il Seop Kim),강호민(Ho-Min Kang) 한국원예학회 2011 한국원예학회 학술발표요지 Vol.2011 No.5

저장온도가 MA 저장한 수송나물(Salsola komarovi lljin)과 해홍나물(Suaeda maritima L. Dum.)의 MA저장성에 미치는 영향

유태종(Tae-Jong Yoo),김일섭(Il Seop Kim),강위수(Wie-Soo Kang),강호민(Ho-Min Kang) (사)한국생물환경조절학회 2010 생물환경조절학회지 Vol.19 No.3

염생식물 중 생체로 이용되고 있는 수송나물(Salsola komarovi Iljin)과 해홍나물(Suaeda maritima L. Dum.)의 상품화를 위해 포장 판매 및 저장이 동시에 가능한 MAP(modified atmosphere package)의 저장성을 몇가지 온도에서 비교하였다. 온실에서 재배한 수송나물과 해홍나물을 50㎛(ceramic) 필름으로 포장하여 2℃, 10℃, 25℃에 저장하였다. 저장중 생체중 감소는 모두 1% 미만이었는데, 역시 상옹에서 가장 빠르게 감소하였으며, 수송에서 감소폭이 컸다. 포장재내산소 농도는 저장온도별로는 2℃에서 가장 높게 유지되었으며, 25℃에서는 수송이 해홍보다 낮은 농도를 보였다. 포장재내 이산화탄소 농도는 산소농도와 반대로 저장온도별로는 25℃에서 가장 높았으며, 식물별로는 수송에서 높았는데 두 식물 모두 2℃와 5℃에서는 1% 이하로 유지되었다. 포장재내 에틸렌 농도는 10℃에서 2℃보다 높았으나, 통계적인 유의성은 없었다. 10℃에서 에틸렌 농도는 두 식물 모두 20μLㆍL?¹으로 같은 수준으나, 2℃에서는 해홍이 다소 높았다. 온도에 따른 포장재내 이산화탄소와 에틸렌 농도는 저장온도가 높을수록 높았는데, 수송나물에서는 2℃와 10℃간 통계적 유의성이 있는 차이를 보인 반면, 해홍나물의 경우 그 차이에 통계적 유의성이 인정되지 않았다. 관능검사로 실시한 외관상 품질은 3점까지 상품성을 인정하였는데, 수송나물의 경우 상품성인 인정된 저장 일수가 24℃에서는 3일, 10℃에서는 7.5일 2℃에서는 14일이었고, 해홍나물은 24℃에서는 3.5일, 10℃에서는 9.5일 2℃에서는 11일이었다. 외관상 품질 변화와 포장재내 이산화탄소와 에틸렌 농도로 볼 때 해홍나물의 경우 2℃ 저온에서 저장성이 10℃와 차이가 없어 저온장해가 의심되었다. This study was carried out to compare the storability of Salsola komarovi Iljin and Suaeda maritima L. Dum which stored at different storage temperatures in MA storage. These plants that had grown in greenhouse packed with 50 ㎛ ceramic film and then stored in 2℃, 10℃, and 25℃ temperature. The fresh weight loss both plants was less than 1% in all temperature treatments. The highest fresh weight loss showed at 25℃ among storage temperature treatments in Salsola komarovi Iljin between plants. The highest carbon dioxide contents in package showed at 25℃ among storage temperature treatments in Salsola komarovi Iljin between plants, and at 2℃ and 10℃ temperature treatments remained less than 1%. Oxygen contents in package both plants showed the highest level at 2℃ temperature treatment, but Salsola komarovi Iljin showed less oxygen contents than Suaeda maritima L. Dum. Although there was no significant difference ethylene contents in package between 2℃ and 10℃ temperature treatments, the higher showed in 10℃ than 2℃ temperature treatments. The ethylene contents in package both plants were roughly 20μLㆍL?¹ and the higher was in Suaeda maritima L. Dum than Salsola komarovi lljin at 2℃. As increasing the storage temperature, the contents of carbon dioxide and ethylene in package also increased in both plants. The carbon dioxide and ethylene contents of Salsola komarovi Iljin showed a significant difference between 2℃ and 10℃ temperature treatments, but Suaeda maritima L. Dum did not show. The shelf life of Salsola komarovi lljin based on visual quality was 14 days at 2℃ temperature treatment and 7.5 days at 10℃ temperature treatment. However, the shelf life of Suaeda maritima L. Dum did not show a significant difference between 2℃ temperature treatment that was 11 days, and 10℃ temperature treatment that was 9.5 days. Considering visual quality and gas contents in package, Suaeda maritima L. Dum might appear chilling injury at 2℃ temperature treatment.

착색단고추 생리장해과와 정상과의 수확 후 생리 및 신선편이의 저장성 비교

유태종(Tae Jong Yoo),최인이(In-Lee Choi),정현진(Hyun Jin Jung),김일섭(Il Seop Kim),강호민(Ho-Min Kang) (사)한국생물환경조절학회 2010 시설원예‧식물공장 Vol.19 No.1

여름철 강원도 고랭지 재배되는 착색단고추는 비상품과로 분류되는 생리장해과가 발생이 많은데, 본 실험은 이들 생리장해과의 신선편이 이용 가능성을 알아보고자 실시하였다. 착색단고추의 정상과와 배꼽썩음과 그리고 납작과를 수확하여 신선편이로 제조하여 수확후 생리현상과 몇 가지 MAP 조건에서 저장성을 비교하였다. 저장전 이들 신선편이의 호흡률과 에틸렌 발생률은 정상과와 생리장해과의 차이에 일정한 경향이 없었으며 통계적 유의성도 나타나지 않았다. 이들 3가지의 형태의 과실의 신선편이를 두께 25㎛와 50㎛의 세라믹 필름으로 포장하여 4℃와 9℃ 그리고 상온에서 저장하였다. 저장중 생체중 감소는 모두 1.1% 이하로 과실형태로는 그 차이에 유의성이 없었으며 필름두께가 얇을수록 저장 온도가 높을수록 컸다. 이들 포장재내 이산화탄소와 산소농도의 경우 품종과 과실형태별 차이에 유의성은 없었으며 저장온도별로 저온이었던 4℃ 처리와 필름종류에서는 두께가 얇았던 25㎛ 세라믹 필름포장처리에서 낮은 이산화탄소와 높은 산소 농도를 보였다. 저장기간 중 변화를 보면 4℃ 저장은 9일 이후, 9℃ 저장은 6일 이후 포장재내 급격한 이산화탄소 농도 증가와 이와 동반된 산소 농도 감소나 나타났는데, 이 시점은 외관상 품질이 급격히 감소한 때와 일치하였다. 에틸렌 농도는 상온을 제외한 모든 처리구에서 7μLㆍL?¹ 이하를 보였는데 포장재 두께가 얇은 25㎛ 세라믹 필름포장과 4℃ 저장 처리구에서 낮게 유지되었으며 과실형태별로 유의성 있는 차이나 일정한 경향은 없었다. 저장 최종일에 외관상 품질은 3일간 저장하였던 상온에서 가장 크게 감소하였으며 처리간 차이에 유의성은 없었다, 9℃와 4℃ 저장에서는 정상과에서 외관상 품질이 높게 유지되었으나 생리장해과와의 차이에 통계적 유의성은 없었다. 저장온도별로 9일간 저장한 9℃에 비해 12일간 저장한 4℃에서 높게 유지되었다. 이상의 결과를 종합하면, 착색단고추 과실의 형태 및 품질이 신선편이의 저장성에 큰 영향을 주지 않았으며 저온 장해가 있는 착색단고추 과실이지만 신선편이의 경우 4℃의 저온이 보다 효과적인 것을 알 수 있었다. The study was conducted to compare the postharvest physiology and storability of fresh cut paprika fruits classified by normal, blossom end rot(BER), and misshapen (or knots) fruit. Some disordered paprika fruits that were produced frequently during high temperature season in highland, were sorted out to non-marketable products. These fruits are mostly wasted, but some of them may be used for fresh cut. The respiration rate of fresh cut paprika fruits was lower and ethylene production rate was higher in normal fruits than in disordered fruits, but there was no significant difference. The fresh-cut paprika fruits were stored in MAP conditions at 4℃, 9℃ and room temperature in 25 ㎛ and 50 ㎛ thickness ceramic film packaging. The fresh weight of fresh cut paprika fruits decreased below to 1.1% regardless of fruit types, but the fresh weight loss increased in thinner packaging materials and lower storage temperatures. There were not significant different carbon dioxide and oxygen contents in MAP of all fruit types, while 4℃ storage temperature treatment and 25 ㎛ thickness ceramic film treatment had lower carbon dioxide and higher oxygen contents. Moreover, the carbon dioxide and oxygen contents were changed rapidly at 9 days in 4℃ storage and at 6 days in 9℃ storage when the visual quality of fresh cut decreased dramatically. The ethylene concentration of packages was below 7 μlㆍl?¹ in all treatments during storage, while the treatments of thinner packaging material and lower storage temperature showed lower ethylene concentration. The fresh cut of disordered fruits showed less visual quality than normal fruit treatment in both 4℃ and 9℃ storage temperatures, but there was no significant difference. The value of 4℃ treatment that measured 12 days in storage was higher than 9℃ treatment that measured 9 days in storage. The results suggest that the disordered fruits may be used to fresh cut product without any concerns that they will decreased the value of commodities more quickly than the fresh cut made of marketable paprika fruits. As the fresh cut paprika fruits stored in MAP condition, the more effective storage temperature is 4℃ that may have induced chilling injury a whole fruit of the paprika.

고체 이산화탄소를 이용한 고농도 이산화탄소 처리 장치 개발

유태종(Tae Jong Yoo),최인이(In-Lee Choi),김일섭(Il Seop Kim),강호민(Ho-Min Kang) 한국생물환경조절학회 2007 한국생물환경조절학회 학술발표논문집 Vol.16 No.2

예냉 처리가 퉁퉁마디의 MA 저장성에 미치는 영향

정현진(Hyun Jin Jung),유태종(Tae Jong Yoo),손진성(Jin Sung Son),이스람모하메드조히를(Mohammad Zahirul Islam),홍성미(Sung Mi Hong),지수빈(Su Bin Ji),강호민(Ho-Min Kang) 한국원예학회 2011 한국원예학회 학술발표요지 Vol.2011 No.5

5일 보존용 채혈백에 따른 보존일자별 농축혈소판의 생화학 및 성상 분석

이동범 ( Dong Beom Lee ),유태종 ( Tae Joung Yoo ),김태전 ( Tai Jeon Kim ),김승곤 ( Seung Kon Kim ),신종관 ( Jong Kwan Shin ),양대형 ( Dae Hyung Yang ),고광임 ( Goung Yim Ko ),박성훈 ( Seung Hun Park ) 대한임상검사과학회 2002 대한임상검사과학회지(KJCLS) Vol.34 No.2

Biochemical changes and icon of platelets on platelet concentrates preserved for a 5 day term in several plastic containers were investigated. The authors evaluated the TOTM-PVC second generation container produced by Green Cross Medical Corp. and Boin medica. Blood obtained from 40 persons was manufactured for platelet concentrates within 4 hours and each divided into 20 units of platelet concentrations. Samples were taken at 0, 3, and 5 days and the platelet count, pH, p02, pC02, HC03-, glucose, LDH, lactate, electrolytes, and mineral element were tested. ’fhe number and MPV, for platelets icon, were well preserved on two different platelet concentrates during storage. A test for biochemical function appeared to be effective data. pH was maintained above 6.8 on two different platelet concentrates during storage. The results suggest that the TOTM-PVC second generation platelets storage container produced by Green Cross Medical Corp. and Boin medica was able to preserve platelets for at least five days without lesion and was it concluded to have biochemical efficacy on patients with transfusions.

몇가지 방울토마토와 송이토마토의 품종별 숙기별 수확 후 생리 및 품질 비교

이스람모하메드조히를 ( Islam Mohammad Zahirul ),유태종 ( Tae Jong Yoo ),정현진 ( Hyun Jin Jung ),최인이 ( In Lee Choi ),전신재 ( Shin Jea Jeon ),원재희 ( Jae Hee Won ),이윤석 ( Youn Suk Lee ),김영식 ( Young Shik Kim ),김일섭 ( Il Seop 강원대학교 농업생명과학연구원(구 농업과학연구소) 2010 강원 농업생명환경연구 Vol.22 No.-

This study was conducted to compare the postharvest physiological characteristics and qualities of 5 different tomato cultivars; `Koko`, `Suncherry-250`, `Unicon`, `Aranka` and `Campri`. Tomatoes were harvested by 3 different maturities; turning (30% orange color), pink (80% orange color), and light red (30% red color) stages. The respiratory rate and ethylene production rate was higher in cherry tomato cultivars (`Koko`, `Suncherry-250`, `Unicon`) than the truss cultivars (`Aranka`, `Campri`). The firmness of fruit decreased with increase of maturity, and it was the highest in `Unicon` among cherry tomato cultivars and `Aranka` between truss tomato cultivars. As maturity increased, soluble solids increased and it was higher in cherry tomato cultivars than the truss cultivars, and the highest in `Suncherry-250` among cherry tomato cultivars. However, the titratable acidity decreased with the increase of maturity, and it was higher in `Aranka` among all cultivars. The sugar/acid ratio was lower in truss cultivars than the cherry tomato cultivars, because of titratable acidity. The vitamin C content increased as maturity progressed and it was higher in cherry tomato cultivars than the truss tomato cultivars. The firmness that should be the one of the most important quality for exporting tomato was higher in `Unicon` among cherry tomato cultivars, but there was not any significant difference in qualities between truss cultivars.

수경재배한 토마토의 품종별 품질특성 비교 및 품질특성간 상관관계

이스람모하메드조히를(Islam Mohammad Zahirul),유태종(Tae-Jong Yoo),정현진(Hyun Jin Jung),최인이(In-Lee Choi),전신재(Shin Jea Jeon),원재희(Jae Hee Won),이윤석(Youn Suk Lee),김영식(Young Shik Kim),김일섭(Il Seop Kim),강호민(Ho-Min Kang) (사)한국생물환경조절학회 2010 생물환경조절학회지 Vol.19 No.2

본 연구는 국내에서 주로 생산되고 있는 대과종 토마토 품종의 품질을 비교 조사하여, 토마토의 원활한 유통 및 수출을 위한 수확후 관리 분야의 연구의 기초 자료를 얻고자 수행되었다. 과피색은 품종별 일정한 경향 없이 a*/b 값은 2.8에서 4.8범위 안에 있었다. 호흡률과 에틸렌 발생률도 품종간 큰 차이를 보이지는 않았다. 내적 품질 중 경도는 ‘Picasso’, ‘Tymaxx’, ‘Madison’에서 가장 높았다. 당도의 경우 대체로 6°Brix 수준을 나타내었는데 ‘Hoyong’과 ‘Dotearang Dia’가 높았다. 비타민 C 함량은 ‘Super Sunroad’와 ‘Dotearang Dia’가 가장 높았다. 산도는 품종별 큰 차이 없이 ‘Hoyong’이 가장 높았으며, 이 때문에 당산비는 당도와 유사한 양상으로 유럽계 중 당도가 낮았던 ‘Amaral’, ‘Picasso’, ‘Tymaxx’에서 낮았다. 이상의 결과로 보면 수출 토마토에서 중요한 품질 요인인 경도는 유럽계가 당도와 비타민 C 함량은 동양계가 높았다. 품질 요인간 상관관계는 a*/b* 값으로 표시한 과피색이 여러 품질 요인과 높은 상관관계를 나타내었는데, 특히 당도와 가장 높은 상관계수(r = 0.801)를 나타내었다. 또한 수출현장에서 중요하게 다루는 경도와 당도는 부의 상관관계(r = ?0.601)를 나타내었다. This study was conducted to compare the quality characters of 15 different tomato cultivars (‘Dotearang Dia’, ‘Super Dotearang’, ‘Super sunroad’, ‘Hoyong’, ‘Mirokku’, ‘Baccuhs’, ‘Mascara’, ‘Poseidon’, ‘Radido’, ‘Madison’, ‘Rapsodie’, ‘Solomon’, ‘Amaral’, ‘Picasso’, ‘Tymaxx’) and find out the correlation among the quality characters in order to get basic informations for exporting tomato. The a*/b* value of fruit surface showed from 2.8 to 4.8, but there was no significant difference in fruit surface color value, such as a*, b* and a*/b* among the cultivars. The respiration and ethylene production rate also were not shown any significantly difference among cultivars. The firmness of fruit was higher in ‘Picasso’, ‘Tymaxx’ and ‘Madison’ cultivars. The contents of soluble solids was higher in ‘Hoyong’ and ‘Dotearang Dia’ cultivars. The vitamin C content was higher in ‘Super Sunroad’ and ‘Dotearang Dia’ cultivars. The titratable acidity was higher in ‘Hoyong’ cultivars. The sugar/acid ratio that depended on soluble contents was lower in ‘Amaral’, ‘Picasso’, ‘Tymaxx’ cultivars that showed lower soluble contents. Conclusionally, The firmness that was one of the most important quality character in exporting tomato was higher in European cultivars, but soluble solide and vitamin C content were higher in Japanese cultivars. The significant correlation coefficient values were determined (more than p = 0.05) between a*/b* and other quality characters. The results suggested that surface color was the most suitable character represented tomato qualities. The high coefficient value (r = 0801) between a*/b* and the contents of soluble solids. The firmness and the contents of soluble solids that is the most important factor for exporting showed significant negative correlation (r = ?0.611).