해양조사 연구에서 RI 이용 기술

홍기훈,Hong, Gi-Hun 한국동위원소협회 1994 동위원소회보 Vol.9 No.1

소양호 집수하천 및 소양호의 지구 화학적인 연구

홍기훈,김석현,김경태 ( Gi Hoon Hong,Suk Hyun Kim,Kyung Tae Kim ) 한국하천호수학회 1989 생태와 환경 Vol.22 No.3

N/A

모바일 네트워크에서 로밍을 위한 계층적 인증 방법

홍기훈,정수환,Hong, Ki-Hun,Jung, Sou-Hwan 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.12C

This paper proposes a fast authentication scheme based on hierarchical key structure (HiFA) for roaming mobile nodes in both intra-domain and inter-domain. The full authentication procedure standardized in IEEE 802.11 and 802.16 is difficult to be applied to a handover since it needs a heavy operation and long delay time during a handover. Though a number of schemes were proposed to solve the problem, the existing schemes might degrade the security of authentication or impose heavy administrative burden on the Pome authentication server. The main contribution of this paper is to reduce the communication and computation overhead of the home authentication sewer without degrading the security strength of the fast roaming authentication using hierarchical authentication key structure. The proposed scheme iii this paper decentralizes the administrative burden of the home authentication server to other network entities such as a local authentication server or access point and supports the security separation of the authentication key among local authentication servers using hash key chain. 이 논문에서는 모바일 네트워크에서 이동 노드의 로밍을 위한 해시 기반의 인증 방법을 제안한다. IEEE 802.11과 802.16 기반의 인증 방법은 많은 지연 시간과 계산 과부하로 인하여 핸드오버와 로밍의 인증방법으로 적용하기 부적절하다. 따라서 다양한 방법들이 제안되었지만, 기존의 방법들은 인증의 보안을 약화시키거나 이동시마다 홈 인증 서버에 과도한 인증 부담?을 부여한다. 이 논문에서는 계층적 인증키 관리 구조를 통해 홈 인증 서버의 관리 부담 감소와 핸드오버를 위한 인증 방법의 보안 강화에 초점을 맞추고 있다. 제안하는 방법은 인증키에 해시 키 체인을 적용하여 계층적으로 관리함으로써 흠 인증 서버의 관리 부담을 로컬 인증 서버와 엑세스 포인트로 분산시키고 각 인증 서버와 엑세tm 포인트간에 인증키를 독립화하여 보안을 강화한다.

진해만 퇴적물 중의 중금속 분포

홍기훈,박영안,이광우,Hong, Gi Hoon,Park, Yong Ahn,Lee, Kwang Woo 한국해양학회 1983 韓國海洋學會誌 Vol.18 No.2

Sediments were collected from eight stations in JJJJinhae Bay and heavy metals were fractionated into the adsoibed reducible, oxidizable and residual fractions. Cd, Cu, Pb and Zn in each fraction were determined by atomic absorption spectriphotmetry. Cd was shown to be mainly in the adsorbed form, Cu in the oxidizable and resedual fractions, and Pb and Zn mainly in the seducible fractions. The total concentrations of Cu, Pb and Zn in sediments decreased gradually with increasing distance from the heak of the bay, and the relationship of linear segression was obtained.

A Case of Moderate Paraquat Intoxication with Pulse Therapy in the Subacute Stage of Pulmonary Fibrosis

홍기훈,정진희,어은경,Hong, Ki-Hun,Jung, Jin-Hee,Eo, Eun-Kyung Korean society of Clincal Toxicology 2008 대한임상독성학회지 Vol.6 No.2

In South Korea, attempted suicide by paraquat (PQ) intoxication is fairly common, and is lethal by pulmonary fibrosis and hypoxemia. However, the treatment of PQ poisoning is primarily supportive management. To increase the survival rate associated with PQ intoxication, many treatments have been developed. Here, we treated a case of PQ intoxication with steroid pulse therapy. A 23-year-old man was admitted to the hospital because of PQ intoxication. He drank two mouthfuls of Gramoxon (24% commercial paraquat). His vital signs were stable, but he had a throat infection, and navy blue urine in the sodium dithionite test. Standard treatment, including gastric lavage with activated charcoal was performed, and emergent hemoperfusion with a charcoal filter was initiated 11 h after PQ ingestion. Pharmacotherapy was initiated 18 h after PQ ingestion with the administration of 5 mg dexamethasone. On day 10, chest PA showed pulmonary fibrosis. Therefore, we initiated steroid pulse therapy, with 1g methylprednisolone in 100 mL of D5W administered over 1 h repeated daily for 3 days, and 1 g cyclophosphamide in 100 mL of D5W administered over 1 h daily for 2 days. On day 15, dexamethasone therapy was initiated. On day 30, pulmonary fibrosis was improved. Thus, if pulmonary fibrosis becomes exacerbated after dexamethasone therapy during the subacute stage, pulse therapy with methylprednisolone and cyclophosphamide could be helpful.

Annual cycles of nutrients and dissolved oxygen in a nutrient-rich temperate coastal bay, Chinhae Bay, Korea

홍기훈,김경태,배세진,김석현,이수형,HONG, GI HOON,KIM, KYUNG TAE,PAE, SE JIN,KIM, SUK HYUN,LEE, SOO HYUNG The Korean Society of Oceanography 1991 韓國海洋學會誌 Vol.26 No.3

The annual cycles of plant major nutrients and dissolved oxygen in a nutrients-rich semi-enclosed coastal inlet, chinhae Bay, of the southern coast of the Korean Peninsula are first presented. The water column of the bay is stratified during summer (April-late September) and well0mixed during winter (October-March). During the summer stratification period, dissolved oxygen contents exceed 400uM in the surface but diminish to less than 50uM in the near bottom waters, which often results in an anoxic environment in the inner part of Chinhae Bay. After the breakdown of the stratification in October, dissolved oxygen concentration remains undersaturated until February. The evidence of allochthonous input of N-nutrients throughout the year is readily seen in the water column: however. crude budget calculations show that the nutrients are efficiently utilized within the bay ecosystem, and that export of the nutrients from the bay to the shelf must be negligible. There is no sign of the enrichment of the nutrients in the water column. The eutrophication phenomenon sensu stricto is not observed in chinhae Bay. Using the standing stock of dissolved oxygen and estimation of the oxygen fluxes across the air-sea boundary, a benthic oxygen respiration rate during winter is estimated conservatively at 21-24 mmol Cm/SUP -2/d/SUP -1/. this oxygen respiration rate accounts for about 20% of the total phytoplankton production in winter.

LED가 결합된 야간풍력발전 활용을 포함한 해상환경 바이오매스 생산시스템의 최적 설계

홍기훈(Gi Hoon Hong),조성현(Sunghyun Cho),강훈(Hoon Kang),박정필(Jeongpil Park),김태옥(Tae-Ok Kim),신동일(Dongil Shin) 한국가스학회 2015 한국가스학회지 Vol.19 No.2

최근 화석연료의 사용증가에 따라 대량으로 배출되는 이산화탄소는 지구 온난화 현상을 일으키는 온실가스 중 하나로 지정되어 국제협약을 통하여 온실가스의 배출을 저감하도록 규제하고 있다. 본 연구에서는 이산화탄소를 저감하는 방법 중의 하나로, 3세대 바이오매스 생산시스템인 해조류를 활용한, 지속가능한 신 개념의 FPSO로서 해상환경 바이오매스 생산시스템의 최적구조를 설계하였다. 이를 위해 격자로 구조물을 설치한 후 해조류의 주변에 LED 조명을 비추어 성장을 최대화 시키는 시스템을 구상하였다. 그리고 기존 해조류의 성장자료를 통하여 해조류의 성장 모델을 만든 후 풍력발전기와 LED 조명을 포함하는 바이오매스 생산시스템을 모델링하여 최적화 도구인 GAMS 프로그램을 이용하여 본 시스템이 환경적 관점뿐만 아니라 경제성 측면에서도 타당성을 가질 수 있는 최적구조를 설계하였다. 또한 기존의 해상환경 바이오매스 생산시스템과 비교하여 최적구조를 제안하였다. Carbon dioxide was designated as one of greenhouse gases that cause global warming. Among various ways to solve the CO<SUB>2</SUB> emission issue, the 3rd-generation biomass (algae) production is considered as a viable method to reduce CO<SUB>2</SUB> in the atmosphere. In this research, we propose a design of an innovative sustainable production system by utilizing the 3rd generation biomass in the environment of floating production storage and offloading (FPSO). Existing biomass production systems depend on the solar energy and they cannot continue producing biomass at night. Electricity produced from offshore wind farms also need an efficient way to store the energy through energy storage system (ESS) or deliver it real-time through power grid, both requiring heavy investment of capital. Thus, we design an offshore grid structure harnessing LED lights to supply the necessary light energy, by using the electricity produced from the wind farm, resulting in the maximized production of biomass and efficient use of wind farm energy. The final design integrates the biomass production system enhanced by LED lights with a wind power generation. The suggested NLP model for the optimal design, implemented in GAMS, would be useful for designing improved offshore biomass production systems combined with the wind farm.

공정시뮬레이션 툴을 활용한 CO₂/Steam 고온 공전해 시스템의 목적산물별 경제성 분석

홍기훈(Gi Hoon Hong),정우현(Woohyun Jung) 한국가스학회 2020 한국가스학회 학술대회논문집 Vol.2020 No.10

초해상도 영상복원을 이용한 집적영상의 해상도 향상

홍기훈(Keehoon Hong),박재형(Jae-Hyeung Park),이병호(Byoungho Lee) 한국통신학회 2009 韓國通信學會論文誌 Vol.37 No.8

본 논문은 집적영상의 요소영상을 초해상도 영상복원에 이용하여 집적영상의 해상도를 향상시키는 방법을 제안한다. 집적영상에서 전체 요소영상의 인접한 단일 요소영상들 사이에는 대상물체의 동일한 부분의 상을 포함하는 공통부분이 존재한다. 이러한 공통부분들을 초해상도 영상복원의 저해상도 영상으로 이용하게 되면 CCD(Charge Coupled Device) 등의 영상취득 장치의 제한된 해상도로 인한 집적영상의 낮은 해상도 문제를 보완 할 수 있게 된다. 전체 요소영상과 제안된 방법을 이용하여 해상도를 향상시킨 전체 요소영상을 비교하여 제안된 방법의 타당성을 증명하였다. We proposed a new method to improve the resolution of elemental image set in the integral imaging system using super-resolution image reconstruction method. Adjacent elemental images have same image region which is projected from the common area of object. These projected images in the elemental image can be used for low resolution images of super-resolution method. Two methods for resolution improvement of elemental image set using super-resolution method are proposed. One is super-resolution among the elemental image sets and the other is among the elemental images. Simulation results are compared with resolution improved elemental image set using interpolated method.

IPSec을 이용한 음성 보안 시스템

홍기훈(Kihun Hong),임범진(Bumjin Im),이상윤(Sangyun Lee),정수환(Souhwan Jung) 한국정보보호학회 2001 정보보호학회논문지 Vol.11 No.2