항공여객 특성분석을 통한 환승시설·서비스 및 환승투어 만족도 제고 연구

김광옥,김기웅,김광일,김남선,박성식,Kim, Kwang-Ok,Kim, Kee-Woong,Kim, Kwang-Il,Kim, Nam-Sun,Park, Sung-Sik 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.2

The volume of transfer passengers now faces a crisis because the number of Chinese and Japanese passengers, the majority of transfer through Korea, is decreasing. This paper is analyzing the their air travel behaviors as well as characteristics of their transfer behaviors at airport. According to the research, it is suggested that transfer passengers perceive the importance of duty-free stores but their satisfaction of using duty-free stores during their transfer at Icheon airport was proven to be low. Considering the characteristics of transfer service quality at Incheon airport, waiting time of transfer is important but not satisfactory for them. Moreover, information of free transfer tour to city downtown and paid-in transfer tour for medical tourism is not known very well among North East Asian passengers. Thus, it is necessary to do detailed research of North East Asian transfer passengers, who have transferred through Incheon airport more than twice a year, to find out their exact needs of transfer tour in Korea.

ARIMA-개입모델을 이용한 항공기상정보 사용료 징수액 추정 및 적정성 연구

김광옥,박성식,Kim, Kwang-Ok,Park, Sung-Sik 한국항공운항학회 2018 한국항공운항학회지 Vol.26 No.3

Korea meteorological administration(KMA) has started to levy air meteorological service charge on both national and foreign carriers since 2005. The charge has grown on 2010 and 2014 twice. However, KMA has still kept asking airlines to agree with another increase in the charge due to the low cost of goods recovery ratio of 7%. The air meteorological charge has changed from 2,210 KRW at the beginning to 11,400 KRW as of June 2018. According to ARIMA intervention time series analysis, it was proven national carriers would make a payment of 831 million KRW 2018 and 1,024 million KRW 2019, showing 186.2% and 123.2% increase compared to last year respectively. The total amount of charge for both national LCC and foreign airlines was aggregated up to 1,952 million KRW 2019, 227% bigger than the charge paid at 2017. Considering the 50% increase of consumer price index last decade, the increased charge would impair the global competitiveness of national carriers. It could be suggested that current air meteorological charge scheme be improved to apply overseas trend and for national carriers to have a competitive advantage in global aviation market.

인터넷 및 방송서비스의 QoS 보장을 위한 10Gbps급 스트리밍 패킷 스케줄러 구조 및 제어방법

김광옥,박완기,최병철,곽동용,Kim Kwang-Ok,Park Wan-Ki,Choi Byeoun-Chul,Kwak Dong-Yong 대한전자공학회 2004 電子工學會論文誌-TC (Telecommunications) Vol.41 No.1

본 논문에서는 초고속 패킷 스위치 네트워크에서 VoD나 HDTV, VoIP같은 고품질 스트리밍 서비스의 QoS를 보장하는 패킷 스케줄러의 구조 및 제어방법을 제시한다. 스트리밍 서비스는 버스트 데이터 응용서비스보다 더욱 엄격한 QoS(jitter, delay, packet loss)보장을 요구한다 또한 스트리밍 서비스는 다른 플로우들의 동작에 상관없이 끊김 없는 서비스를 제공하기 위해 각 플로우별로 최소 대역 보장과 종단간 지연조건을 보장해야 한다. 이들 요구조건들을 만족하기 위해, 패킷 스케줄러는 플로우들이 다른 플로우의 영향을 받지 않도록 분리하고, 각 플로우들에게 종단간 지연 보장을 제공해야 한다. 그리고 각 플로우들에게 요구되는 최소 대역폭을 할당해야한다 지금까지 많은 벤더들이 10Gbps급 트래픽 관리기 칩을 개발하였지만 대부분 칩들은 고품질 스트리밍 서비스를 지원하지 못하는 단점이 있다. 따라서 본 논문에서는 상용 TM칩들의 단점 및 스트리밍서비스의 트래픽 특성을 조사하고, 제안한 패킷 스케줄러의 하드웨어 구조를 제시한다. 그리고 마지막으로 제안한 스케줄러의 시물레이션 결과를 분석하였다. This paper presents architecture and control method of packet scheduler to guarantee QoS of high quality streaming services in high-speed packet-switched networks. Since streaming services need far more stringent QoS requirements than the typical sort of burst data applications, they should be guaranteed minimum bandwidth and end-to-end delay bound to each flow, regardless of the behavior of other flows. To meet these requirements, a packet scheduler isolate a flow from the undesirable effects of other flows and provides end-to-end delay guarantees for individual flow and divides stringently the available link bandwidth among flows sharing the link. Until now, many vendors are developing traffic management chips running at 10Gbps, but most of chips have drawbacks to support high quality streaming services. In this paper, we investigate the drawbacks of commercial TM chips and traffic characteristic of streaming services and present implementation frameworks of the proposed packet scheduler. Finally, we analyze the simulation results of the proposed scheduler.

RSOA기반 WDM-PON 링크와 Reach Extender를 이용한 2.5 Gbps 하이브리드 PON 링크 기술

김광옥(Kwang-ok Kim),이지현(Jie-hyun Lee),이상수(Sang-soo Lee),장윤선(Youn-seon Jang) 한국통신학회 2011 韓國通信學會論文誌 Vol.36 No.6B

본 논문에서는 기존 G-PON(Gigabit Passive Optical Network) 링크에 RSOA(Reflective Semiconductor Optical Amplifier) 기반 DWDM-PON(Dense Wavelength Division Multiplexing-PON) 기술과 O/E/O 변환 방식의 RE(Reach Extender) 기술을 적용하여 전송거리와 링크 용량 그리고 분기수를 증가시킬 수 있는 2.5 Gbps 하이브리드 PON 링크의 구조를 제안한다. RSOA 기반 DWDM-PON 기술은 간선 중계링크에 적용되어, 기존 G-PON 보다 최대 32배의 링크 전송용량을 제공할 수 있다. RE 기술은 원격노드에서 GTC(GPON Transmission Convergence) 프레임의 재 변조를 통해 DWDM-PON과 G-PON 사이의 파장변환 기능을 제공하며, 상향 프레임의 수신을 위한 버스트 모드 리셋 신호를 제공한다. 본 논문에서 제안된 하이브리드 PON은 상용 G-PON 시스템을 사용하여 WDM 신호 파장 당 최대 60 ㎞의 전송거리와 128분기를 제공할 수 있다. We presents the architecture of the 2.5 Gbps hybrid PON link which can increase of the transmission distance and link capability, and split ratio by using a colorless DWDM-PON and O/E/O based reach extender into an existing G-PON link. A RSOA based DWDM-PON to apply the feeder fiber can provide a link capacity of 32 larger that of a legacy G-PON. The reach extender converts the wavelength of DWDM-PON to G-PON through GTC frame regeneration at the remote node, and can provide a burst reset signal in order to extract upstream burst signal, simultaneously. The proposed hybrid PON enable a legacy G-PON to operate over the maximum 60 ㎞ distance with a 128-way split per WDM wavelength.

19세기 후반 일본의 琉球병탄과 淸과의 영토분쟁 처리

김광옥(Kim Kwang-Ok) 부산경남사학회 2007 역사와 경계 Vol.65 No.-

In 1879 Japan annexed Ryukyu Kingdom and renamed it Okinawa Prefecture. But Chinese Goverment strongly protested against Japanese action, saying that they were ready to carry out military intervention. Japanese leaders wanted to avoid war because of military inferiority. General Grant- ex-president of U.S - meditated the conflicting Sino-Japanese claims over Ryukyu Islands. It was Japanese leaders that suggested the plan of dividing Ryukyu Islands. Japanese foreign Minister-Inoue Kaoru thought that Japan can cede two islands of Ryukyu to China, instead of it Japan can acquire the treaty revision from China. Li Hung-chang expected that by obtaining two islands of Ryukyu Islands, China can restore Ryukyu Kingdom at those islands and can aboid war with Japan. The delegates of two countries met in Peking and after two months' discussion, on 21 October 1880, agreed on a treaty. But Chinese leader rejected the ratification of the Ryukyu division treaty, therefore this treaty was not realized. After 1881, Japanese authorities renegotiated secretly with China on Ryukyu problems. But it ended in failure. Japan possessed Taiwan by Sino-Japanese war in 1894-95. Therefore Ryukyu eventually became subject to Japanese territory.

고 Isoflavone 콩나물이 만성 에탄올 투여 흰쥐의 지질대사에 미치는 영향

김광옥(Kwang?Ok Kim),이혜성(Hye?Sung Lee) 한국식품영양과학회 2007 한국식품영양과학회지 Vol.36 No.12

본 연구는 고 isoflavone 콩나물이 만성 에탄올 섭취 동물에서 지질대사와 항산화 효소계에 미치는 영향을 살펴보고 기능성 식품으로서의 가능성을 알아보기 위하여 수행되었다. 실험동물은 SD계 수컷쥐를 사용하였으며 40일간 Lieber-DeCarli 액체식이를 일부 변형한 실험식을 공급하여 고 isoflavone 콩나물과 isoflavone 추출물이 에탄올 투여 흰쥐의 지질대사와 항산화효소계에 미치는 영향을 조사하여 다음과 같은 결과를 얻었다. High SS군은 알코올 대조군에 비하여 체중증가량, 식이섭취량 및 식이효율이 모두 증가되었으나, low SS군과 IE군은 전반적으로 체중증가량, 식이섭취량 및 식이효율이 알코올 대조군보다 낮았다. 고 isoflavone 콩나물과 대두 isoflavone 추출물은 알코올 투여시 증가된 혈장 TG, TC, AI를 낮추었고, HDL-chol/TC의 비를 높였으며 간조직의 총 지질량, TG, TC 수준을 낮추었다. Isoflavone 추출물은 간조직의 TBARS 수준을 유의하게 낮추었으나 간조직 항산화효소 활성도를 증가시키지는 않았으므로 isoflavone의 항산화기전에 대한 연구가 필요할 것으로 보인다. 이상의 결과로부터 고 isoflavone 콩나물과 isoflavone 추출물은 혈장과 간조직의 지질 농도와 지질과산화를 낮추며 일부 항산화 효소계에 긍정적인 효과를 미치는 것으로 보인다. The present study evaluated the effects of isoflavone-rich bean sprout on the lipid metabolism in ethanol-treated rats. Fifty male Sprague-Dawley rats were randomly divided into five groups: normal control, alcohol control, low soybean sprout+ethanol (low SS), high soybean sprout+ethanol (high SS) and isoflavone extract +ethanol (IE). They were fed experimental diets based on Lieber-DeCarli liquid diet for 40 days. Body weight, food intake and feed efficiency ratio (FER) of ethanol-treated groups were significantly suppressed compared with that of the normal control group. Among the ethanol-treated groups, high SS group showed in significant increase in the body weight, food intake and FER. Supplementation of isoflavone-rich soybean sprout powder or isoflavone extract significantly decreased plasma triglyceride (TG), total cholesterol (TC), atherogenic index (AI) and increased the ratio of HDL-cholesterol to TC. Supplements also significantly decreased total lipid, TG and TC in liver tissue compared with that of alcohol control. There was a significant decrease in hepatic lipid peroxidation products in IE group compared with other ethanol-treated groups. This results suggest that supplementation of isoflavone-rich bean sprout powder may exert beneficial effects on lipid metabolism in chronically alcohol-treated animals by improving lipid profiles in plasma and liver tissues.

GPON링크에서 동일한 시리얼 넘버를 가진 가짜ONT의 등록 차단에 관한 연구

김광옥(Kwang-OK Kim),김근용(Geun-Yong Kim),이동수(Dong-Soo Lee) 한국통신학회 2009 한국통신학회 학술대회논문집 Vol.2009 No.6

日本 近世後期 藩政改革과 儒學

金光玉(Kim Kwang-ok) 동양사학회 1995 東洋史學硏究 Vol.51 No.-

NP기반 2.5Gbps IPOA/POS패킷 포워딩엔진 구조 설계

김광옥(Kwang-Ok Kim),최창식(Chang-Sik Choi),정연쾌(Youn-Kwae Jeong),곽동용(Dong-Yong Kwak) 대한전자공학회 2002 대한전자공학회 학술대회 Vol.2002 No.11

Ethernet PON을 위한 ONU MPCP 프로토콜 설계

김광옥(Kwang-Ok Kim),최창식(Chang-Sik Choi),곽동용(Dong-Yong Kwak) 대한전자공학회 2002 대한전자공학회 학술대회 Vol.2002 No.11