온라인 플랫폼을 활용한 수산식품 구매요인 우선순위 분석: AHP 기법을 활용하여

정현기,기해경,박세현,Jeong, Hyun-Ki,Kee, Hae-Kyung,Park, Se-Hyun 강원대학교 경영경제연구소 2022 Asia-Pacific Journal of Business Vol.13 No.3

Purpose - The purpose of this study to explore factors consumers prioritize when purchasing seafood online. The originality of the study lies on adopting AHP-based approach in analyzing prioritized purchasing factors of seafood online. Design/methodology/approach - A survey was conducted targeting Korean consumers who have purchased seafood online. AHP method was applied to rank factors consumers prioritize before making decision. Findings - First, product's factor ranked first among other high level factors including delivery service, seller, online platform. Second, sanitation, taste, country of origin ranked first, second, third respectively, within product's factors. Third, safe delivery, timeliness, information accuracy ranked first, second, third respectively, within delivery factors. Fourth, consumer reviews, consumer response ability, promotion ranked first, second, third within seller factors. Fifth, Personal information management system, credibility, user-friendliness ranked first, second, third, within online platform factors. Research implications or Originality - To activate seafood online market, it is crucial to assure consumers that the seafood is well managed in a sanitary way from the production site to table. Existing government programs such as seafood traceability system, HACCP, and cold-chain infrastructure needs improvement. Due to highly perishable characteristic of seafood, delivery factors matter when purchasing online. Online platforms needs to continue to improve delivery service. Seafood products are mostly not branded and without objective information about their properties. Creating quality classification and seafood brands are likely to help consumers chose seafood online.

스케일러블 비디오 코딩에서 방향성 정보를 이용한 모드 결정 고속화 기법

정현기(Hyun-Ki Jung),홍광수(Kwang-Soo Hon),김병규(Byung-Gyu Kim),김창기(Chang-Ki Kim),유정주(Jeong-Ju Yoo) 한국방송·미디어공학회 2012 방송공학회논문지 Vol.17 No.1

수용성 고분자 PVP K-30로 제조된 레르카니디핀 고체분산체의 용출 특성

정현기(Hyun Ki Jeong),박진영(Jin Young Park),김수영(Su Young Kim),차세롬(Se Rom Cha),이선의(Seon Eui Lee),장나금(Na Keum Jang),이원택(Won Taek Lee),이진표(Jin Pyo Lee),송정은(Jeong Eun Song),강길선(Gilson Khang) 한국고분자학회 2016 폴리머 Vol.40 No.1

레르카니디핀 염산염은 디하이드로 피리딘의 칼슘채널 차단제로서 혈액이 체내에서 더 자유롭게 순환할 수 있도록 혈관을 확장시켜주는 고혈압 치료제이다. 레르카니디핀은 난용성 약물로 약물 전달 시스템에 적용하는데에 어려움이 많다. 이번 연구에 있어서 우리는 레르카니디핀에 수용성 고분자인 PVP K-30을 첨가하여 용출률을 개선시키기 위한 방법으로 분무건조와 회전증발법을 이용한 고체 분산체를 제조하였다. 또한 물질의 방출 거동은 in vitro로 평가하였으며 재료의 용출 거동 결과에서 고체분산체는 약물의 화학 구조 변화로 인하여 물질의 용해도가 증가되는 것으로 나타났다. Lercanidipine hydrochloride is a calcium channel blocker of the dihydropyridine, which opens the blood vessels for allowing the blood to circulate more freely around the body. Lercanidipine is a poorly water soluble drug and quite difficult to deliver. Taking this into account, in the study, we have designed lercanidipine loaded water soluble polymer PVP K-30 via solid dispersion method using spray drying and rotary evaporation to improve the dissolution properties. Further, the dissolution behavior of the materials were evaluated by in vitro assays. Results showed that solid dispersion has increased the dissolution properties of the materials owing to the change in the drug chemical structure.

다발성 늑골골절 치험 100례

이남수,정현기,손광현,Lee, Nam-Soo,Jeong, Hyun-Ki,Sohn, Kwang-Hyun 대한흉부심장혈관외과학회 1979 Journal of Chest Surgery (J Chest Surg) Vol.12 No.4

During the period of 4 years from August 1, 1975 to August 1, 1979, authors have experienced 100 cases of multiple rib fractures by nonpenetrating injury at Department of Thoracic Surgery, Paik Foundation Hospital in Seoul, Korea. 1. The ratio of male to female patients with multiple rib fracture was 2.6:1 with male predominance and 84% of the total cases were between 20 and 50 years of age. 2. The most common cause of multiple rib fracture was traffic accident and falls accounted for the next largest group. 3. The most common site of rib fracture was 4th rib to 7th rib level on both hemithorax [52%]. 4. Associated injuries were cerebral contusion in 26%, clavicular fracture in 22%, long bone fracture in 22%, pelvic bone fracture in 10%, and scapular fracture in 8%. 5. Early complications and/or result of the multiple rib fractures were lung contusion in 23 cases, subcutaneous emphysema in 21 cases, hemothorax in 21 cases, hemopneumothorax in 6 cases, and flail chest in 12 cases. 6. The flail chests were managed by strapping the chest with adhesive plaster, external traction of flail segment with towel clip, ventilatory assistance for marginal clinical indications, and in cases of complicated with intrathoracic hemorrhage, wire fixation of flail segment through open thoraco-tomy. 7. The principles of therapy for hemothorax and/or pneumothorax were rapid reexpansion of the lungs by thoracentesis [11%] and closed thoracostomy [22%], but open thoracotomy had to be done on 3 cases because of massive bleeding or intrapleural hematoma and diaphragmatic rupture. 8. The over all mortality was 4% [4 among 100 cases] and the cause of all deaths was head injury.

진양호 환경요인과 동물플랑크톤 군집 동태

윤종수(Jong-su Yoon),정현기(Hyun-Gi Jeong),권영호(Young-Ho Kwon),신찬기(Chan-ki Shin),황동진(Dong-jin Hwang) 대한환경위생공학회 2008 대한환경위생공학회지 Vol.23 No.4

Our study indicates the zooplankton abundance with characteristics of water column and the vertical distribution in Lake Jinyang, South Korea. Seasonal changes of zooplankton community are determined by environmental parameters like water temperature, pH, dissolved oxygen, suspended solids and chlorophyll a. In lake Jinyang, this study showed that the zooplankton abundance in transition zone(St.1, St.2) was higher density than in lacustrine zone(St.3). Rotifers were dominant zooplankton and among them, Polyarthra spp., Keratella spp, and Nauplli(Copepoda) were common. But Cladoceran showed the low density. During survey period, zooplankton abundance with vertical distribution in surface layer(epilimnion) was higher than in bottom layer(hypolimninon). Zooplankton densities in Surface and middle layer showed positive relationship with water temperature and the densities in bottom layer(hypolimnion) showed positive relationship with chlorophyll a. Our assumption in spite of the short term study are supported by the facts that increase of temperature driven by climate change more maintains the thermocline duration by the summer temperature stratification. Thus the results suggest that the climate changes are an important source of changing zooplankton community feeding phytoplankton. So the zooplankton should be monitoring by the ecological management of Lake Jinyang to cope with climate changes like flood plain or drought.

오리발 유래 콜라겐 스펀지의 피부재생 효과 : In vitro 연구

차세롬(Se Rom Cha),정현기(Hyun Ki Jeong),김수영(Su Young Kim),김은영(Eun Young Kim),송정은(Jeong Eun Song),박찬흠(Chan Hum Park),권순용(Soon Yong Kwon),강길선(Gilson Khang) 한국고분자학회 2015 폴리머 Vol.39 No.3

피부재생을 위한 생체재료는 염증반응이 최소화되는 안정한 소재로 빠른 피부재생을 돕기 위해 우수한 생체 활성과 생체친화성을 가져야 하며, 세포의 부착과 성장을 돕는 미세구조와 다공성이 있어야 한다. 본 연구에서는 새로운 콜라겐 원으로서의 축산부산물인 오리발을 사용하여 콜라겐을 추출하였고 이를 탈미네랄화된 골분(demineralized bone powder, DBP), 돼지 소장점막하 조직(small intestinal submucosa, SIS)과 비교하기 위해 스펀지 형태로 제작하였다. 지지체의 물리, 화학적 특징은 SEM, FTIR을 통해 확인하였다. 세포를 파종하여 MTT를 통해 세포의 부착 및 증식률을 측정하였고, 전염증성 사이토카인의 발현도를 보기 위해 RT-PCR을 실시하였다. 또한 항산화 활성능력을 보기 위해 1,1-diphenyl-2-picrylhydrazyl(DPPH)를 측정하였다. 그 결과 오리발 콜라겐 지지체가 물리적 특성이 우수하고 생체적합성이며, 상처 치유제로서의 가능성을 보여주었다. For biomaterials for skin regeneration with minimized inflammatory response, high bioactivity and biocompatibility are highly required. Also, it should have a porous microstructure to improve cell adhesion and growth. In this study, we extracted a new collagen source from duck"s feet which is by-product, and made the shape of sponges from duck’s feet collagen (DC) to compare with DBP and SIS. To analyze physical and chemical property of the scaffold, SEM and FTIR were used. MTT assay was used to measure the attachment and proliferation of NIH/3T3 in the scaffolds. RTPCR was used to evaluate the expression of proinflammatory cytokine. Also, 1,1-diphenyl-2-picrylhydrazyl (DPPH) was used to measure the ability of antioxidant activity. Overall, this study shows that DC scaffold is biocompatible and has good physical property. Additionally, DC scaffold shows the potential as wound healing biomaterials.

헤스페리딘을 함유한 락타이드 글리콜라이드 공중합체 지지체에서 섬유륜 세포의 증식과 거동 평가

장나금(Na Keum Jang),고현아(Hyun Ah Ko),차세롬(Se Rom Cha),이선의(Seon Eui Lee),정현기(Hyun Ki Jeong),김수영(Su Young Kim),신재훈(Jae Hun Shin),김은영(Eun Young Kim),송정은(Jeong Eun Song),강길선(Gilson Khang) 한국고분자학회 2015 폴리머 Vol.39 No.5

항산화와 항염증으로 잘 알려진 헤스페리딘은 디스크 재생을 위해 효과적인 지지체로 제작하기 위해 사용하였다. 지지체는 poly(lactide-co-glycolic acid) (PLGA)에 헤스페리딘(0, 3, 5, 10%)을 첨가하여 염 침출법으로 제작하였고, 섬유륜 세포(AF)를 파종한 후 세포의 변화를 연구하였다. SEM, WST 그리고 RT-PCR 분석을 통해 세포의 부착과 증식, 세포의 표현형 분석을 실시하였다. 또한 면역조직화학염색을 통하여 AF세포의 생체 내 거동을 확인하였다. 그 결과, 5% 헤스페리딘이 함유된 PLGA 지지체가 가장 좋은 세포의 형태와 생체 적합성을 보여, 디스크 재생을 위한 지지체로서의 활용 가능성을 확인하였다. Hesperidin, a well-known antioxidant and anti-inflammatory agent, was smartly used for designing efficient scaffolds for disc regeneration. The scaffolds were synthesized via a salt-leaching method by adding hesperidin (0, 3, 5, & 10%) to poly(lactide-co-glycolic acid) (PLGA) followed by a cellular behaviors study by seeding annulus fibrosus (AF) cells. The cellular adhesion, proliferation and phenotypes were further evaluated by SEM, WST and RT-PCR, respectively. Additionally, AF cell behavior was studied by immunohisto-chemical staining in vivo. Results showed that PLGA scaffold with 5% hesperidin are best suited for disc regeneration, showing good cellular morphology and biocompatibility.

전극형상에 의한 초고압 CV케이블 절연체의 부분방전 특성

김균식(Kim Gyun-Sig),김병현(Kim Byug-Hyun),정현기(Jeong Hyeon-Ki),차광석(Cha Kwang-Seok) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-

In this thesis, it is investigated that the effect of the cross linked polyethylene(XLPE) insulator do tn breakdown phenomenon by the insertion of the needle and bar electrode into XLPE which is used of electric power cable for the ultra-high voltage. The result of the partial discharge properties in the specimen showed that in case of the insertion of needle or bar electrode into XLPE, the effect of the inner discharge become large when the air void is bigger then the clearance of the electrode of the specimen. The closer the distance between the insulation and needle electrode, it takes less time to the insulation breakdown.

PVP 첨가에 의해 제조된 올메사탄 메독소밀 고체분산체의 방출패턴 연구

오승창(Seung-Chang Oh),이천중(Cheon Jung Lee),이현구(Hyun Gu Lee),박진영(Jin Young Park),정현기(Hyun Ki Jeong),김영래(Young-Lae Kim),임동권(Dong-Kwon Lim),이동원(Dongwon Lee),강길선(Gilson Khang) 한국고분자학회 2015 폴리머 Vol.39 No.1

올메사탄은 BCS 2단계에 해당하는 약물로 물에 잘 녹지 않는 난용성 약물이다. 이런 약물이 낮은 생체이용률과 제형을 설계하는 과정에서 어려움을 주는 원인이 된다. 본 연구에서는 올메사탄을 분무건조법 및 회전용매증발법을 이용해 고체분산체를 제조하여 제법에 따른 난용성약물의 용출률을 확인하였다. 수용성 고분자로 PVP를 사용하여 약물과 고분자의 비율별로 고체분산체를 제조하였다. SEM을 이용하여 고체분산체의 형태학적인 특성을 분석하였고, 고체분산체의 결정학적 성질은 XRD와 DSC를 통하여 확인하였다. 또한 FTIR을 통해 화학적인 변화를 확인하고, 생체 외 용출거동 실험을 통하여 변화된 용출률을 확인하였다. 제조된 고체분산체는 pH 1.2에서 용출을 확인하였으며, 올메텍과 용출률을 비교하였으며, 분무건조를 통해 약물의 용출률을 향상시킬 수 있다는 것을 확인할 수 있다. Olmesartan affiliated to biopharmaceutics classification system class 2 is a poorly water soluble drug. For this reason, olmesartan showed a low bioavailability and a lot of difficulties in the process of designing the pharmaceutical formulation. We prepared the solid dispersions of olmesartan. We confirmed the dissolution rate of drug which was prepared by manufacturing. The pharmaceutical formulation of solid dispersions was designed by using PVP as water soluble polymer. We analyzed morphological feature of solid dispersion by employing a scanning electron microscope. Then, the crystalline property of solid dispersion was confirmed through X-ray diffraction and differential scanning calorimeter. Also, the chemical change of solid dispersion was confirmed by the Fourier transform infrared spectroscopy. In vitro dissolution test was used to analyze the dissolution rate of solid dispersion. The prepared solid dissolution olmesartan confirmed the dissolution rate in the pH 1.2. It was compared with olmetec and improved dissolution rate through solid dispersion.

연구논문 : 주남저수지 유역의 오염원과 수질변동에 따른 식물플랑크톤 군집

이혜진 ( Hae Jin Lee ),서정관 ( Jung Kwan Seo ),정현기 ( Hyun Ki Jeong ),탁보미 ( Bo Mi Tak ),이재관 ( Jae Kwan Lee ) 한국환경과학회 2010 한국환경과학회지 Vol.19 No.11

This study presented seasonal changes of the phytoplankton community in Junam reservoir by pollution and water quality of the lake. The water storage of the reservoir is 5.3 million ton, most of which are being utilized for agricultural, industrial and residential purposes. The annual precipitation during the investigation period was 1,868.9 mm, increasing by 20% from the average annual level of 1,506.7 mm in 2009. The annual average water storage was 57.3%. It decreased during agricultural season and then increased again after monsoon rainfall. The loads of BOD were 3,799 kgday-1, and 81% of them came from livestock and household. The TN and TP loads were 1.164 kgday-1 and 170 kgday-1, respectively, and 76% of them came from livestock. We assessed water quality of the Junam reservoir using 17 variables. According to the result, the reservoir met the fourth grade, meaning slightly bad, because of high concentration of COD, SS and chlorophyll-a. Eutrophication assessment was conducted by revised Carlson`s Index (TSIm. Aizaki), and it was found that the entire lake was eutrophicated with high chlorophyll-a concentration all through the year, except during February to April and in July. A total of 76 phytoplankton species were identified from the samples. Among them, the largest number of species were Chlorophyceae with 33 species(43.4%), followed by Bacilliophyceae with 27 species(35.5%). Cyanophyceae with 8 species(10.5%), and Cryptophyceae with species(10.5%). The total cell number of phytoplankton was the highest in October(7,884 cells mL-1) among Cyanophyceae and Bacilliophyceae. The seasonal succession of Chlorophyceae(Chlamydomonas spp.), Cyanophyceae(Microcystis aeruginosa) and Cryptophyceae(Rhodomonas spp.) was observed during January to May, July to September and October to December respectively.