리셀테라피를 이용한 위축성 여드름 흉터 치료 11례

오철,허금정,이원행,양진아,김기태,Oh, Chul,Huh, Geum-jung,Lee, Won-haeng,Yang, Jin-ah,Kim, Ki-tae 대한한방내과학회 2016 대한한방내과학회지 Vol.37 No.2

Objective: Acne scarring is the most common sequela after dermal inflammation caused by acne. Many methods are currently used to treat acne scarring; doctors using traditional Korean medicine have also attempted to treat acne scarring in a new way that was developed from traditional methods. This study examines the effectiveness of re-cell therapy.Method: Eleven patients with various types of acne scars were treated by re-cell therapy. We used the global acne scarring classification (GASC) and ECCA (from the French “echelle d’evaluation clinique des cicatrices d’acne”), both of which are generally used to measure and grade the degree of acne scarring.Results: As a result of the treatment, the conditions of all patients were conspicuously improved in both scales. The GASC scores of the patients changed from grade 19.6±10.4 to grade 4.9±3.3 (p=0.001), and the ECCA scores changed from grade 120.9±28.7 to grade 41.8±18.3.Conclusion: Re-cell therapy showed effectiveness in treating acne scarring and could be applied in clinical cases.

스마트 자동차 기술은 자동차 산업의 기술패러다임을 바꿀 수 있을까?-기회의 창의 관점에서 스마트 자동차의 기술적 특허분석을 중심으로-

오철 ( Chul Oh ) 한국경영공학회 2018 한국경영공학회지 Vol.23 No.2

Recent changes in the automobile industry seem to be proceeding in a different direction from the trajectory developed over the last 100 years and the convergence of the ICT technology and the automobile industry is becoming reality. Judging whether the current trend of smart car technology has the power to change the paradigm of the automobile industry is of great significance when analyzing the automobile industry. In this study, we systematically classified smart car technology based on existing literature on smart cars, various government reports and patent data, and based on this we conducted an in - depth technical analysis on smart vehicle technology using the collected patent data. The results of the analysis are as follows. First, smart car technology has been growing rapidly since 2011. Second, if you look at smart car technology from a quantitative perspective on patent applications, GM is the most active in technology development among the existing “Big Five” makers. Toyota, Hyundai Motor Co. and Renault Nissan are top-ranked, Volkswagen is relatively lagging behind. Third, patent applications are mostly made by parts and materials manufacturers, ICT companies, and platform companies such as Google, rather than by existing car makers. Fourth, in the past, technology trends have been focused on safety-related technology, but today’s smart car technology focuses on communication related technology. This trend will further accelerate the convergence of the automobile industry and the ICT industry. In summary, when we look at the technology application related to smart cars, the main players are those related to the ICT industry, not to the existing car makers, and from the technical point of view the technology is developing in a new area that is not the powertrain centered on engines and transmissions being the original technology of the existing automobile industry. In the end, the convergence of industries, that is, the convergence of the ICT and the automobile industry, will change the automobile industry into a different shape in the future and it seems highly likely that the automobile industry will be reborn as a new industry called smart cars. This will certainly serve as a window of opportunity for new latecomers.

인공 우식 유발성 biofilm 구성성분의 시간 흐름에 따른 변화

오철 ( Chul Oh ),판딧싼토스 ( Santosh Pandit ),전재규 ( Jae-gyu Jeon ) 대한예방치과·구강보건학회 2019 대한구강보건학회지 Vol.43 No.3

Objectives: The purpose of this study was to investigate changes in the composition of artificial cariogenic biofilms using a Streptococcus mutans biofilm model over a period of time. Methods: We analyzed the dry weight, colony forming unit (CFU) number, extracellular polysaccharide (EPS) biovolume, and acid production rate of S. mutans biofilms formed on saliva-coated hydroxyapatite discs after 26 h, 50 h, 74 h, 98 h, 171 h, and 195 h. In addition, we performed a laser scanning confocal fluorescence microscopy to determine the bacterial volume, EPS biovolume, and biofilm thickness. We calculated the biofilm density using dry weight and EPS biovolume. Results: Over a period of time, there was no change in the CFU number and acid production rate of S. mutans biofilms, but there was an increase in the dry weight and EPS biovolume of S. mutans biofilms. The bacterial volume, EPS biovolume, and biofilm thickness only increased in the 50-h-old biofilm; however, no change was observed in 50-195-h-old biofilms. In addition, an increase in the biofilm density was observed over time. Conclusions: These results suggest that the acid production ability of cariogenic biofilms does not change, but the biofilm density increases over time. However, due to scientific information, further research needs to be conducted in the field of dentistry to get further insights on the progression of cariogenic biofilms over time.

淸空膏의 내피세포 의존성 혈관이완효과

오철(Chul Oh),김호현(Ho Hyun Kim),고흥(Heung Ko) 한의병리학회 2008 동의생리병리학회지 Vol.22 No.3

중국기업의 글로벌 스마트시티 시장 진출 현황 분석: 글로벌 사우스 진출사례를 중심으로

오철 ( Oh Chul ),노수연 ( No Suyeon ),이영환 ( Lee Younghwan ) 국민대학교 중국지식네트워크 2024 중국지식네트워크 Vol.23 No.23

This paper aims to analyze the status and competitiveness of Chinese firms' overseas investment in the global smart cities market, which is a key platform for the Fourth Industrial Revolution. Chinese firms invest in the overseas smart cities market for various reasons, including traditional motives of MNCs’ FDI such as market seeking, strategic asset seeking, and efficiency seeking, as well as the motive to minimize political risks in China. Two cases of Chinese firms' investment in the overseas smart cities market are introduced: Huawei's Safe City solution and Country Garden's Forest City project, both of which are underway in Belt and Road Initiative (BRI) countries and the Global South. The two cases share the following characteristics: first, the project is led by a Chinese private firm. Second, a partnership is established with a local company. Third, the perceptions of host countries toward Chinese firms conducting projects vary, with the government being friendly while the civil society remains critical. Based on the case study analysis, the strengths of Chinese firms are their technological capabilities, abundant domestic construction references, and active cooperation with the Chinese government. Their weaknesses are the risk of financial instability of the parent company and a lack of understanding of bottom-up smart cities model centered on citizens. The rapid growth of the global smart cities market, especially in developing countries, and the support of the Chinese government are opportunities for Chinese companies to enter the global market. However, there are potential threat factors such as host country’s government containment, especially in developed countries, competition in new city development with countries such as Korea, and increasing universal awareness of data and information protection. The implications of this paper are as follows: First, a balanced analysis of China's BRI and Chinese-style smart cities is needed. Second, the relationships between stakeholders involved in smart cities are complexly formed, so it is necessary to identify and utilize these relationships in the context of the host country or the project. Third, in order for Korean companies to succeed in the global smart cities market, it is necessary to analyze the past failures of U-City.

항공기 제조 산업의 기술적 혁신에 대한 연구 -세계 1위의 중소형 항공기 제조업체 엠브라에르의 기술적 분석을 중심으로-

오철 ( Chul Oh ) 한국항공경영학회 2016 한국항공경영학회지 Vol.14 No.1

Boeing and Airbus shared the global aircraft manufacturing market two decades ago, while several domestic manufacturers such as Brazil``s Embraer and Canada``s Bombardier manufactured a small number of small andmidium-sized aircraft. But, growing sales of aircraft manufacturing market, the rapid progress of regional anilines and low-cost carriers, and furthermore, the growing demand for private-jets have led to the explosion in the popularity of small and midium-sized aircraft worldwide over the last decades. These changes in the market enable Embraer to upgrade his position in the market quickly enough to threaten the market leaders, Boeing and Aircraft which both failed to make the expected profits recently. Embraer became the world``s third largest aircraft manufacturer after Boeing and Airbus through incessant innovation in times of crisis. As a manufacturer of small and medium-sized aircraft, it has developed into the world’s number one company. In the recent 20 years, at a time of change in the aviation industry, Embraer has pursued Boeing and Airbus, which are existing market leaders through disruptive innovation, while posing a destructive threat. Embraer completed the privatization in 1994, and within the last 20 years it has reached the current position through innovation in the supply chain due to accumulation of technological capabilities, system integration and risk partnership. It will be significant to look at recent trends and predict the future directions of the aircraft manufacturing industry through the strategic selection and technological analysis of Embraer, the world``s highest manufacturer of small and medium-sized aircraft.

첨단산업의 부상과 중국 산업정책의 진화: 중국 드론산업의 사례

박준기 ( Park Jun-ki ),서봉교 ( Seo Bongkyo ),오철 ( Oh Chul ) 현대중국학회 2017 현대중국연구 Vol.19 No.1

This paper examines the development process of China`s drone industry and compares the different characteristics between new industrial policies in the drone industry and traditional industrial policies in the existing industries. Industrial policies applied in the drone industry`s development process appear to be different from traditional industrial policies. Firstly, the catch-up process in traditional industries has been led by government upbringing through selective assistance policies. However, in the case of drone industry, the development process has been mainly led by private firms even before the government strategically initiated the supportive industrial policy. Secondly, Chinese government has set up variety of regulations to protect local firms from advanced multinational companies during the promoting process of catch-up for existing industries. However, for drone industry, deregulations by government and free competition with global drone manufacturers have become the core of the development process. Thirdly, Chinese government has used a technology-led policy through government intervention in the traditional industrial catch-up process, but in the drone industry, private firms` technology innovation has preceded.

W / O Emulsion 을 이용한 구형 실리카 입자의 제조와 크기 제어

박재형(Jae Hyung Park),정수철(Su Chul Chung),오철(Chul Oh),신승일(Seung Il Shin),임승순(Seung Soon Im),오성근(Seong Geun Oh) 한국공업화학회 2002 공업화학 Vol.13 No.6

Spherical silica particles were prepared using W/O emulsion through the hydrolysis and condensation reactions of tetraethyl orthosilicate (TEOS). In the preparation of particles, the effects of hydroxypropyl cellulose (HPC), molar ratio of water to TEOS (R_w), the amount of emulsifier (Span 80 or Span 80/Tween 20 mixed surfactants) were investigated. The morphology and size distribution of silica particles were greatly influenced by the stability of emulsion. In general, the size of silica particles decreased and the size distribution of particles became narrow as the amount of HPC, Rw and the amount of emulsifier increased.

효모에서 분리한 멜라닌 생성 억제 물질의 작용 기전

이승선(Seungsun Lee),정호권(Hokwon Jung),오철(Oh Chul),최태부(Taeboo Choe) 한국생물공학회 2004 KSBB Journal Vol.19 No.2

Mechanism of melanogenesis inhibition by melanoston isolated from yeast

Seungsun Lee(이승선),Hokwon Jung(정호권),Oh Chul(오철),Taehoo Choe(최태부) 한국생물공학회 2004 한국생물공학회 학술대회 Vol.2004 No.10