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카노모형과 개선갭분석을 이용한 EMS 서비스품질의 전략적 개선방안
김명섭 ( Myung Sub Kim ),류문찬 ( Moon Charn Riew ) 한국품질경영학회 2015 품질경영학회지 Vol.43 No.3
Purpose: Express mail service(EMS) supplied by ‘Korea POST`is an international postal service which brings letters, documents and parcels to a destination abroad in the fastest and safest way. This service is in a tough competition with global companies such as TNT, FedEx, DHL or UPS. To build an effective strategy for being competitive, an intensive study on EMS service quality should be accomplished from a customer`s perspective. Methods: Kano model and improvement gap analysis are used to categorize and prioritize EMS service quality attributes. A 5-point Lickert scale is employed to apply the Kano model and improvement gap analysis. Each quality attribute can be classified as weak in comparison with competitors, critical for improvement, or potentially competitive. Results: Price, on-time delivery and delivery quality are to be kept as is; fast delivery, parking convenience and staff expertise can be potentially competitive; and the other attributes are considered to be critical for improvement. Conclusions: Fast reimbursement and proper compensation when shipping items are lost or damaged are to be improved with high priority. Efforts to secure fast delivery, parking convenience and staff expertise are needed to be competitive in the future.
ITO/PET 기판 위에 성장된 산화아연 나노로드에 형성된 은 입자의 광학적 특성 및 소수성 표면 연구
고영환,김명섭,유재수,Ko, Yeong-Hwan,Kim, Myung-Sub,Yu, Jae-Su 한국진공학회 2012 Applied Science and Convergence Technology Vol.21 No.4
인듐주석산화막/폴리에틸렌 테레프탈레이트(ITO/PET: indium tin oxide/polyethylene terephthalate) 유연 기판 위에 성장된 산화아연(ZnO) 나노로드(nanorods)를 이용하여 형성된 은(Ag) 입자의 광학적 특성 및 소수성 표면에 대해 조사하였다. 시료를 준비하기 위해 스퍼터링법(sputtering)으로 코팅된 산화아연 씨드층(seed layer)을 이용하여 전기화학증착법(electrochemical deposition)으로 산화아연 나노로드를 성장시킨 후, 열증발증착법(thermal evaporation)을 사용하여 은을 증착하였다. 산화아연 나노로드의 불연속적인 표면 특성 때문에 은이 증착되면서 나노크기를 갖는 입자로 형성되었다. 비교를 위해 같은 조건으로 은을 평평한 ITO/PET에 증착하여 시료를 준비하였으며, 증착되는 은의 양을 조절하기 위해 100초에서 600초까지 열증발증착시간을 변화시켰다. 은 증착시간이 증가할수록 산화아연 나노로드 표면에 형성되는 은 입자의 크기와 양이 증가하였으며, 또한 빛의 흡수율이 가시광 영역에서 크게 증가하는 것을 확인하였다. 이는 은 입자의 국소표면플라즈몬공명(localized surface plasmon resonance)에서 기인된 것으로 짐작한다. 또한 물방울 테스트실험에서 평평한 ITO/PET에 증착된 은에서의 접촉각(contact angle)보다 산화아연 나노로드에 증착된 은 입자에서의 접촉각이 크게 증가함을 보여, 개선된 소수성 표면을 가질 수 있음을 확인하였다. 이러한 광학적 특성과 소수성 표면 결과는 산화아연 나노로드의 기반의 염료감응형 태양전지 또는 자정효과(self-cleaning)를 갖는 표면구조로 유연소자에 유용하게 응용할 수 있을 것으로 기대된다. We investigated the optical and hydrophobic properties of the deposited silver (Ag) zinc oxide (ZnO) nanorods (NRs) on flexible indium tin oxide (ITO) coated polyethylene terephthalate (PET) substrates (i.e., ITO/PET). The ZnO NRs were grown by an electrochemical deposition using a sputtered ZnO seed layer and the Ag was deposited by using a thermal evaporator. For comparison, the same fabrication process was carried out on the bare ITO/PET without ZnO NRAs. Due to the discrete surface of ZnO NRs, the deposited Ag was formed as nano-scale particles, while the Ag became film-like for bare ITO/PET. In order to control the size and amount of Ag particles, the Ag deposition time was changed from 100 to 600 s. When the deposition time was increased, the Ag particles became larger and denser, and the absorptance was increased. This enhanced absorptance may be due to the localized surface plasmon resonance of Ag particles. Furthermore, the relatively high hydrophobicity was observed for the deposited Ag on the ZnO NRs/ITO/PET. These improved optical and surface properties are expected to be useful for flexible photovoltaic and optoelectronic devices.
자가발전형 에스컬레이터 핸드레일용 Ultraviolet-C LED 살균기 광학설계, 제작 및 살균에 관한 연구
김종오(Jong-Oh Kim),천동해(Dong-Hae Chun),김명섭(Myung-Sub Kim),류우찬(Uh-Chan Ryu) 한국조명·전기설비학회 2022 조명·전기설비학회논문지 Vol.36 No.4
Although a Korean company developed a self-powered ultraviolet (UV) LED sterilizer for escalator handrails, sufficient pasteurization has not been achieved due to lack of optical power, light uniformity, and self-generation capacity. In this study, two types of LED sterilizer samples were produced after optimizing optical distribution by arranging UV-C LEDs and reflectors to experiment with disinfection effect on Escherichia coli (E. coli) and Bacillus cereus (B. cereus) according to exposure time. Both the sterilizers confirmed the pasteurization rate of more than 89.4% and 99.6% in exposing 5s and 15s, respectively, against the both bacterial organisms. A self generator module was also manufactured to give an average electrical power of 7.1W to the 20 LED packages.