사이버 방어를 위한 적응형 다중계층 보호체제

이성기 ( Seong-kee Lee ),강태인 ( Tae-in Kang ) 한국인터넷정보학회 2015 인터넷정보학회논문지 Vol.16 No.5

사이버 공간에서 첨예화, 복잡화되고 있는 공격을 일대일 방식으로 방어하는데 한계가 있으므로 보다 효과적인 방어 방법이 필요하다. 본 고에서는 내외부의 공격에 대해 자산을 체계적 적응적으로 방어할 수 있는 다중계층 보안체제 구축 방안을 제시한다. 방어지역(Defense Zone)을 중심으로 한 다중계층 보안체제의 구조를 고안하고, 사이버 위협분석과 방어기술 자동할당 등 구현에 필요한 기술요소들에 대해 논의한다. 또한, 다중계층 보안체제에 대한 효과와 적용성을 보인다. 향후, 제시된 방안의 구체화를 위해 방어지역에 대한 상세구조설계, 최적 방어기술 자동선택방법, 위협 탐지를 위한 정상상태 모델링 기술 등에 대한 연구가 필요하다. As attacks in cyber space become advanced and complex, monotonous defense approach of one-one matching manner between attack and defense may be limited to defend them. More efficient defense method is required. This paper proposes multi layers security scheme that can support to defend assets against diverse cyber attacks in systematical and adaptive. We model multi layers security scheme based on Defense Zone including several defense layers and also discuss essential technical elements necessary to realize multi layers security scheme such as cyber threats analysis and automated assignment of defense techniques. Also effects of multi layers security scheme and its applicability are explained. In future, for embodiment of multi layers security scheme, researches about detailed architecture design for Defense Zone, automated method to select the best defense technique against attack and modeling normal state of asset for attack detection are needed.

연속회분식 생물막반응기에서 전기분해를 이용한 질소와 인제거

이성기(Seong-key Lee),송영일(Young-Il Song),최병순(Byung-soon Choi),진성기(Sung-Kee Jin) 한국환경관리학회 2003 環境管理學會誌 Vol.9 No.4

연속회분식 생물막반응기에서 전기분해를 이용한 질소와 인제거 (pp.105-105)

이성기(Seong-key Lee),송영일(Young-Il Song),최병순(Byung-soon Choi),진성기(Sung-kee Jin) 한국환경관리학회 2004 한국환경관리학회 학술연구발표회 논문초록집 Vol.2004 No.7

발전용 고온 배관의 점검 및 실시간 변위감시 기술

현중섭(Jung Seob Hyun),허재실(Jae Sil Heo),조선영(Sun Young Cho),허정열(Jeong Yeol Heo),이성기(Seong Kee Lee) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.10

High temperature steam pipes of thermal power plant are subject to a severe thermal range and usually operates well into the creep range. Cyclic operation of the plant subjects the piping system to mechanical and thermal fatigue damages. Also, poor or malfunctional supports can impose massive loads or stress onto the piping system. In order to prevent the serious damage and failure of the critical piping system, various inspection methods such as visual inspection, computational analysis and on-line piping displacement monitoring were developed. 3-dimensional piping displacement monitoring system was developed with using the aluminum alloy rod and rotary encoder sensors, this system was installed and operated on the high temperature steam piping of "Y" thermal power plant successfully. It is expected that this study will contribute to the safety of piping system, which could minimize stress and extend the actual life of critical piping.

NAP 공정을 이용한 하수의 질소 및 인 제거에 관한 연구

이성기,송영일,김현중,진성기 조선대학교 환경연구소 2000 環境硏究 Vol.16 No.1

In the process of NAP(Nightsoil Application Process)to get rid of organism, nitrogen and phosphorus, the retention time in an aerobic tank is set up 4hr, 5hr and 6hr with A1, A2 and A3 reactor the sludge return rate is 50% and the internal return rate is 200%. The change of DO, PH, MLSS, MLVSS, Alkalinity, SBOD, SCOD, Organism, SS, Nutrients and the removal rate of those conditions are followed as below. The removal rate of BOD in each reactor is 81.9% in A1, 83.9% in A2 and 87.2% in A3. The average removal rate of COD is 82.3% in A1, 83.6% in A2 and 88.0% in A3. The average removal rate of SS is 81.9% in A1, 83.9% in A2 and 87.2% in A3. The results show that A3 reactor, which has longer retention time than others in the aerobic tank has better removal rate of organism and SS. The average removal rate of T-N in each reactor is 51.4% in A1, 51.8% in A2 and 60.3% in A3. The average removal rate of T-N is 43.4% in A1, 46.0% in A2 and 52.78% in A3. It indicates that the removal rate is higher when the retention time in the aerobic tank is increased. NAP process can be operated that inserting nightsoil which causes to increase C/N in a reactor affects microorganism activity and increases the removal rate of nutrients in the spite of the decrease of the retention time. If the reactor conditions which are internal return rate, return sludge rate and volume of inserting nightsoil are set up properly. The removal rate can be higher in NAP process than in DNR process in which nightsoil is not inserted.

혐기·호기공정을 이용한 생물막법에서 유기물, 질소 및 인제거에 관한 연구

이성기,송영일,김현중,진성기,김은영 조선대학교 환경공해연구소 2001 環境公害硏究 Vol.17 No.1

Anoxic and Oxic process with contact media is used to remove an organic matter, nitrogen and phosphorus in sewage which derives from domestic wastewater. Experiments have been done with various conditions that concentration of oxygen can be 3㎎/ℓ, 4~5㎎/ℓ and 5~6㎎/ℓ by controlling an retention time can be 10hr, 12hr and 14hr, return rate can be 0%, 100% and 200%. As the concentration of oxygen is 2~3㎎/ℓ, The rate of removal of BOD. COD, SS, T-N and T-P is 87%, 76%, 82%, 34% and 24%. As the concentration of oxygen is 5~6㎎/ℓ, The rate of removal of BOD, COD, SS, T-N and T-P is 92%, 84%, 88%, 45% and 33%. In the rate of removal of an organism, nitrogen and phosphorus thus It well be known that the rate of removal an organic matter, nitrogen and phosphorus will be increased as the concentration of oxygen becomes higher. As th retention time is increased, the rate of removal of BOD, COD, SS, T-N and T-P is gradually higher in the rate of removal of an organic matter, nitrogen and phosphorus. Because contact time and contact area will be increased, which generates active substrate transfer and metabolic react according to increment of retention time. As the return rate is increased, The rate of removal of BOD, COD and SS is likely to be increased, In the case of T-N, It is also increased by 28% at 0% of the return rate and by 60% at 200% of the return rate. In the case of T-P, however, It is deceased , as the return rate is increased by 42% at 0% of the return rate and by 30% at 200% of the return. As the return rate is increased the retention time is decreased, which causes less activity of bacteria which affects that the rate of removal of Phosphorus is decreased.

혐기·호기공정을 이용한 생물막법에서 유기물, 질소 및 인제거에 관한 연구

이성기,송영일,김현중,진성기,김은영 조선대학교 환경연구소 2001 環境硏究 Vol.17 No.1

Anoxic and Oxic process with contact media is used to remove an organic matter, nitrogen and phosphorus in sewage which derives from domestic wastewater. Experiments have been done with various conditions that concentration of oxygen can be 3mg/ℓ, 4∼5mg/ℓ and 5∼6mg/ℓ by controlling an retention time can be 10hr, 12hr and 14hr, return rate can be 0%, 100% and 200%. As the concentration of oxygen is 2∼3mg/ℓ. The rate of removal of BOD. COD. SS. T-N and T-P is 87%, 76%, 82%, 34% and 24%. As the concentration of oxygen is 5∼6mg/ℓ. The rate of removal of BOD, COD, SS, T-N and T-P is 92%, 84%, 88%, 45% and 33%. In the rate of removal of an organism, nitrogen and phosphorus thus It well be known that the rate of removal an organic matter, nitrogen and phosphorus will be increased as the concentration of oxygen becomes higher. As th retention time is increased, the rate of removal of BOD, COD, SS, T-N and T-P is gradually higher in the rate of removal of an organic matter, nitrogen and phosphorus. Because contact time and contact area will be increased, which generates active substrate transfer and metabolic react according to increment of retention time. As the return rate is increased. The rate of removal of BOD, COD and SS is likely to be increased. In the case of T-N. It is also increased by 28% at 0% of the return rate and by 60% at 200% of the return rate. In the case of T-P, however, It is deceased, as the return rate is increased by 42% at 0% of the return rate and by 30% at 00% of the return. As the return rate is increased the retention time is decreased, which causes less activity of bacterial which affects that the rate of removal of Phosphorus is decreased.

NAP 공정을 이용한 하수의 질소 및 인 제거에 관한 연구

이성기,송영일,김현중,진성기 조선대학교 환경공해연구소 2000 環境公害硏究 Vol.16 No.1

In the process of NAP(Nightsoil Application Process)to get rid of organism, nitrogen and phosphorus, the retention time in an aerobic tank is set up 4hr, 5hr and 6hr with Al, A2 and A3 reactor the sludge return rate is 50% and the internal return rate is 200%. The change of DO, PH, MLSS, MLVSS, Alkalinity, SBOD, SCOD, Organism, SS, Nutrients and the removal rate of those conditions are followed as below. The removal rate of BOD in each reactor is 81.9% in A1, 83.9% in A2 and 87.2% in A3. The average removal rate of COD is 82.3% in A1, 83.6% in A2 and 88.0% in A3. The average removal rate of SS is 81.9% in A1, 83.9% in A2 and 87.2% in A3. The results show that A3 reactor, which has longer retention time than others in the aerobic tank has better removal rate of organism and SS. The average removal rate of T-N in each reactor is 51.4% in A1, 51.8% in A2 and 60.3% in A3. The average removal rate of T-P is 43.4% in A1, 46.0% in A2 and 52.78% in A3. It indicates that the removal rate is higher when the retention time in the aerobic tank is increased. NAP process can be operated that inserting nightsoil which causes to increase C/N in a reactor affects microorganism activity and increases the removal rate of nutrients in the spite of the decrease of the retention time. If the reactor conditions which are internal return rate, return sludge rate and volume of inserting nightsoil are set up properly, The removal rate can be higher in NAP process than in DNR process in which nightsoil is not inserted.