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모수원 ( Mo Soo-won ),이광배 ( Lee Kwang-bae ),박정환 ( Park Jeong-hwan ) 한국도서(섬)학회 2018 한국도서연구 Vol.30 No.2
Tourism is widely considered one of the world's largest and rapidly growing industries. Domestic tourism, however, remains an under-researched theme in many countries involving Korea partly due to the difficulty to track domestic tourism and with governments and policy-makers placing emphasis on the attractive higher expenditures of foreign visitors. It is stated that a vibrant domestic tourism sector can cushion the industry from fluctuations of the international tourism market and bring stability and predictability in the industry. Nature-based tourism to national parks gives us broad benefits such as improved physical and mental health, stress reduction and increased social cohesion. Employment is one of tourism’s main development advantages and its role in promoting economic opportunities for communities adjacent to national parks has long been appreciated. But tourism performance in Korean national parks continues to dwindle and stagger. This paper introduces a shift-share decomposition to break down the tourism to the marine national parks into three components: one measuring national effect, and two other components due to changes in compositional effect and regional effect respectively. While the static shift-share analysis shows that the growth in marine national parks’tourism seems to be due to positive national park effect as well as marine national park effect, the dynamic regional effect appears to have a negative effect on visitors. This paper also employs the positioning analysis on national parks using Boston Consulting Group matrix over the period 2011-2016. The BCG analysis shows that Odongdo and Dadohaehaesang succeed in rising to a star area, Byeonsanbando ranges over a cash cow to a child, but Taeanhaean degrades from a child to a dog area.
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지역사회 기반 소아 청소년 알레르기 환자의 보완대체요법 이용 실태조사
박정환,백승민,문수정,서현주,김슬기,이민희,정지훈,이상훈,최선미,Park, Jeong-Hwan,Baek, Seung-Min,Moon, Su-Jeong,Seo, Hyun-Ju,Kim, Sul-Gi,Lee, Min-Hee,Jeong, Ji-Hoon,Lee, Sang-Hun,Choi, Sun-Mi 대한한방소아과학회 2012 대한한방소아과학회지 Vol.26 No.3
Objectives The purpose of this study is to see the prevalence and the patterns of the use of complementary and alternative medicine (CAM) in children and adolescent patients with allergies. Methods We analyzed data on 547 children and adolescents (age from 0-18 years old) chosen from all regions throughout the country with allergic diseases, including atopic dermatitis, allergic rhinitis, asthma and allergic urticaria. We used multiple logistic regression modeling to predict CAM use based on predictor variables. Results The previous 12-months prevalence of CAM usage in overall was 70.7% (atopic dermatitis, 78.1%; allergic rhinitis, 52.9%; asthma, 70.3%; allergic urticaria, 86.3%). Central and southern regions displayed significantly lower rate of using CAM compare to the northern region, and CAM was less likely to be used for the allergic rhinitis patients than the atopic dermatitis patients. The most commonly used CAM type was natural products (62.2%). Top five of the most frequently used CAM modalities were softener water, vitamin, red ginseng, wood bathing and aloe oil. One of the main reasons for trying CAM was from the 'hope for a more effective outcomes in additional to the conventional medicine' (43.9%). The subjective effectiveness of CAM was found to be excellent in 74.0% of the patients, and 70.3% of the parents were willing to recommend CAM therapies to the others. Conclusions CAM is used widely to treat allergic diseases in children and adolescents in Korea. Korean medical doctors should actively discuss the use of CAM with the patients and provide information on the effectiveness and safety of CAM as guide in making choice for usage of CAM.
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2합멀티필라멘트사의 꼬임구조 및 굽힘 특성에 관한 연구호박 -구성 필라멘트사의 굽힘강성-
박정환,김승진,김덕리,Park, Jeong-Hwan,Kim, Seung-Jin,Kim, Deok-Ri 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.6
Bending rigidity (8f) of constituent filament in a single strand consisting the geometical structure of: 2- ply multifilament yarn was theoretically derived in terms of helix angle of single strand before plying(as), plying helix angle(oF) and the ratio of the distance to the filament from strand axis(Y) to strand radius(Rs) by strain energy method. And the change of bending rigidity of constituent filament was analyzed and discussed with change of the ratio of the distance to filament from strand axis to strand radius for the purpose of determining the plying twist processing condition.
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2합 멀티필라멘트사의 꼬임구조 및 굽힘특성에 관한 연구(I) -2합 멀티필라멘트사의 꼬임구조-
박정환,김승진,김덕리,Park, Jeong-Hwan,Kim, Seung-Jin,Kim, Deok-Ri 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.5
The geometrical structure of 2-ply multifilment yarn was assumed, in order to investigate the bending properties of 2-ply multifilament yarn. And angle, Ψ between single filament in the single strand and strand axis was derived by considering the changes of torsion of constituent filaments of the single strand. The angel, Ψ was expressed as a function of plying helix angle, $\alpha$p, filament helix radius, ${\gamma}$, and traverse rotation angle, $\Phi$2 of constituent filament in the single strand.
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C2C12 근육세포에서 과산화수소로 유도된 산화 스트레스에 대한 시체(柿蒂)의 보호효과
박정환,임진영,이민아,성은정,이준수,Park, Jeong Hwan,Lim, Jinyeong,Lee, Mina,Seong, Eunjeong,Lee, Junsoo 대한한의학방제학회 2021 대한한의학 방제학회지 Vol.29 No.4
Objectives : The calyx of Diospyros kaki Thunb. has usually been used to treat obstinate hiccup. This study investigated the protective effects of Diospyros kaki using C2C12 myoblasts of H<sub>2</sub>O<sub>2</sub>-induced oxidative stress. Methods : Cell viability and cytotoxicity were determined by MTT assay. The level of reactive oxygen species (ROS), malondialdehyde (MDA), and reduced glutathione (GSH) were measured by using optical properties. Results : The calyx of Diospyros kaki Thunb. extract showed no toxicity to C2C12 myoblasts until 20 ㎍/mL concentration and increased cell viability compared to the H<sub>2</sub>O<sub>2</sub> treated group. The calyx of Diospyros kaki Thunb. extract inhibited the production of ROS and MDA at all concentrations. In addition, the calyx of Diospyros kaki Thunb. extract increased the concentration of GSH. Conclusion : This study provides that the calyx of Diospyros kaki Thunb. can be used as a potential material that exhibit antioxidative and protective effects on H<sub>2</sub>O<sub>2</sub>-induced oxidative stress in C2C12 Myoblasts.
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