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OSI 기본 등급 가상터미널 형식 명세를 위한 프로토콜 머신의 설계
한선영,장천현 건국대학교 산업기술연구원 1994 건국기술연구논문지 Vol.19 No.-
OSI 망에서 표준화된 터미날 프로토콜로 점차 관심분야로 대두되는 가상터미널 기본등급 프로토콜은 원격지 호스트와 통신하거나 원격지의 자원에 접근하기 우해 표준화되어 있다. 가상터미널 기본 등급 서비스는 개방 시스템 상호접속 환경(OSIE)에서 제공하고 있는 몇 개의 응용 지향적인 통신 서비스 중 하나이다. 본 논문에서는 OSI 기본 등급 가상터미널의 LOTOS 형식 명세를 위하여 그 프로토콜 머신을 설계하였다. Resulting from the growing interest in the standardized terminal protocol within OSI network, virtual terminal basic class protocol is standardized communication protocol between remote hosts and local terminals, Virtual terminal basic class services is one of the several application-oriented communication services being provided by protocols operating in the application layer of the Open Systems Interconnection Environment(OSIE). In this paper, we design the OSI Virtual Terminal Protocol machine for its LOTOS formal specification.
Integrated Ray Tracing Model for In-Orbit Optical Performance Simulation for GOCI
Ham, Sun-Jeong,Lee, Jae-Min,Kim, Seong-Hui,Youn, Heong-Sik,Kang, Gm-Sil,Myung, Hwan-Chun,Kim, Sug-Whan 통신위성우주산업연구회 2006 Joint Conference on Satellite Communications Vol.2006 No.-
GOCI (Geostationary Ocean Color Imager) is one of the three COMS payloads that KARl is currently developing and scheduled to be in operation from around 2008. Its primary objective is to monitor the Korean coastal water environmental condition. We report the current progress in development of the integrated optical model as one of the key analysis tools for the GOCI in-orbit performance verification. The model includes the Sun as the emitting light source. The curved Earth surface section of 2500 km x 2500 km including the Korean peninsular is defined as a Lambertian scattering surface consisted of land and sea surfaces. From its geostationary orbit, the GOCI optical system observes the reflected light from the surfaces with varying reflectance representing the changes in its environmental conditions. The optical ray tracing technique was used to demonstrate the GOCI in-orbit performances such as red tide detection. The computational concept, simulation results and its implications to the on-going development of GOCI are presented.
Sewage Treatment Using Natural Systems and Effluent Reuse for Crop Irrigation in Small Communities
Ham, Jong-Hwa,Yoon, Chun-G.,Jeon, Ji-Hong,Hwang, Ha-Sun The Korean Society of Agricultural Engineers 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.7
A pilot study was performed from July 1998 to December 2002, including winter performance, to examine seasonal performance of a constructed wetland and subsequent pond system for treatment of sewage in small communities of Korea. Pond was operated as a intermittent-discharge pond during winter period, and continuous flow system during growing season; its effects was evaluated from December 2001 to April 2003. The subsurface flow (SSF) wetland was satisfactory for treating sewage with good removal efficiency even during the winter period. The wetland effluent concentrations of $BOD_5$ and TSS were often higher in winter than in the growing season, but this was explained by the higher loading rates, rather than lower removal efficiency. The relatively poor-quality wetland effluent was further polished during winter in the pond. The upper layer of the pond water column became remarkably clear immediately after ice melt. In the growing season, ponds could be operated as a continuous flow system to remove nutrients and pathogens, and the effluent of pond could be reused as a supplemental irrigation water without risk of infection by sewage-borne pathogens as well as causing adverse effect on growth and yield. Overall, the wetland system was found to be adequate for treating sewage with stable removal efficiency, and the intermittent-discharge pond was found to be effective for further polishing if necessary. Therefore, the combination of a wetland and subsequent pond system and reuse of effluent as crop irrigation water is recommended as a practical alternative to treat sewage in Korean small communities, and partial discharge of pond water in March is suggested.
윤춘경 ( Chun Gyeong Yoon ),황하선 ( Ha Sun Hwang ),전지홍 ( Ji Hong Jeon ),함종화 ( Jong Hwa Ham ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.1
Field experimental study was performed to evaluate water and nutrient balances in paddy rice culture. The water balance showed that outflow generally balanced the inflow showing that about half(47~54%) of total outflow was lost by surface drainage. No significant effect of fertilization rate was observed from three treatments (150%, 100%, and 70% of standard fertilization) on both rice yield and nutrient outflow from surface drainage. Therefore, reducing nonpoint source nutrient loading by reducing fertilization may not work well in the range of normal paddy rice farming practice, and instead it could be achieved by reducing surface drainage outflow. Water-saving irrigation by reducing ponding depth, raising ridge height in rice field, and minimizing forced surface drainage are suggested to reduce surface drainage outflow. These practices can save water and protect water quality, however, deviation from conventional standard practices might affect the rice yield and further investigations are necessary. It was demonstrated that rainfall affects nutrient net outflow and paddy rice culture might be beneficial to water quality protection under normal rainfall condition.
농업적 용수재이용을 위한 간헐분사 완속모래여과 하수재처리 효율 평가
윤춘경 ( Chun G. Yoon ),정광욱 ( Kwang Wook Jung ),함종화 ( Jong Hwa Ham ),황하선 ( Ha Sun Hwang ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.5
A pilot study was performed to examine the feasibility of intermittent slow sand filtration for agricultural reuse of reclaimed water. The effluent of biofilter for 16-unit apartment was used as influent to the slow sand filtration system at 0.6 ㎥/day loading rate using 15 seconds spray in every 10 minutes on the about 1㎡ surface area and 0.5 m depth. The influent concentrations of total coliform (TC), fecal coliform (FC) and E. coli were in the range of 10.000 MPN/100 mL, and they were reduced to less than 1,000 MPN/100 mL after filtration with average of 320, 270, and 154 MPN/100 mL, respectively, showing over 95 % removal. Turbidity and SS were improved effectively and their average concentration was reduced to 0.8 NTU and 1.7 mg/L, respectively, and removal rate was about 50 %. Average BOD and COD concentrations were also reduced substantially to 2.6 and 25.8 mg/L with about 55 and 21 % removal rate, respectively. Nutrients removal was relatively low and removal rate for T-N and T-P was low however, remaining nutrients might be beneficial and less concerned in case of agricultural reuse. The concentration of biofilter effluent used in this experiment was in the range of secondary treatment effluent but slightly stronger than the one from existing wastewater treatment plants (WWTPs). Therefore, intermittent slow sand filtration might be also applicable to the effluent from WWTPs as long as its agricultural reuse is available. Considering stable performance and effective removal of bacterial indicators as well as other water quality parameters, low maintenance, and cost-effectiveness, the intermittent slow sand filtration was thought to be an effective and feasible alternative for agricultural reuse of reclaimed water. This paper is a preliminary result from pilot study and further investigations are recommended on the optimum design parameters before full scale application.