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국가 비행종합성능시험장에서의 민간 무인항공기 비행시험 운용절차 수립에 관한 연구
임지성,박대진,전현우,이상철,Lim, Ji-Sung,Park, Dae-Jin,Jeon, Hyun-Woo,Lee, Sang-Chul 한국항공운항학회 2017 한국항공운항학회지 Vol.25 No.4
In recent years, Unmanned Aerial Vehicles (UAVs) were actively developed in various fields. In development process of UAVs, flight test is performed to ensure that minimum safety requirements and technical requirements are met. By constructing flight test infrastructure such as takeoff and landing facilities, operation procedure, and equipments, flight test can be performed effectively. In this paper, operation procedures of civil UAV's flight test are proposed. The procedures proposed are composed by two main steps: first, planning and permitting procedure of flight test. Secondly, execution and control procedure of flight test.
영향인자의 복합적 평가를 통한 낙동강 물금의 조류발생 특성 해석
임지성 ( Ji Sung Lim ),이재호 ( Jae Ho Lee ),김영우 ( Young Woo Kim ),이병헌 ( Byung Hun Lee ),변임규 ( Im Gyu Byun ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.6
Nakdong River is one of the major river in South Korea. Downstream of this river is the intake station of big cities such as Busan. Algae occurrence in the river was one of problem for a long time. Thus, in this study, long term variation of chl-a and water quality, hydraulic and climate parameters were evaluated in winter and summer season at Mulgeum site in downstream the Nakdong River. Water quality, hydraulic and climate parameters are also used for determination of the parameters significantly affecting chl-a concentration by correlation analysis. As a result high concentration of chl-a has been appeared in winter season by bloom of diatom. Thus, control of algae occurrence at Mulgeum site in winter season is needed more than summer season. Inorganic nutrients and BOD5, pH, DO showed similar variation patterns to chl-a. The value of Hydraulic parameters were increased in summer by Monsoon season in South Korea. In this period, low concentration of chl-a was also caused by Monsoon season. With the result of correlation analysis between chl-a and the other parameters, ten parameters (BOD5, COD, DO, NO3-N, NH4-N, PO4-P, pH, discharge, water velocity and precipitation) showed significant correlation(p<0.05) in winter season. On the other hand, seven parameters (BOD5, DO, water temperature, pH, PO4-P, water velocity and water depth) showed significant correlation with chl-a in summer season. Therefore, we need to make a plan for control of algae occurrence through different significant parameters by seasonal change.
다중회귀분석을 이용한 낙동강 하류의 Chlorophyll-a 농도와 복합 영향인자들의 상관관계 분석
임지성(Ji Sung Lim),김영우(Young Woo Kim),이재호(Jae Ho Lee),박태주(Tae Joo Park),변임규(Im Gyu Byun) 大韓環境工學會 2015 대한환경공학회지 Vol.37 No.5
1998년부터 2008년까지 낙동강 물금지점의 수질, 수리 및 기상 인자를 통해 조류발생의 주요 영향인자를 평가하고 chlorophyll-a (chl-a) 예측 모델을 도출하였다. 분석 전 데이터의 신뢰도 향상을 위해 이상치를 제거하는 전처리 과정을 수행하였다. 국내 태풍영향기간을 산정하여 태풍영향기간에 포함된 데이터는 제외를 하였고 관리도 기법을 적용하여 이상치를 제거하였다. 이후 분석과정은 Method 1과 2 두 가지 방법으로 나뉘었다. Method 1은 전처리 과정을 거친 17개 항목의 데이터를 직접 이용하여 chl-a 예측모형을 도출 하였고, Method 2는 전처리 후 주요 영향인자를 도출하여 이를 통해 모형을 개발하였다. Method 2의 상관관계 분석결과 물금지역의 chl-a에 대한 주요영향인자는 수온, pH, DO, BOD, COD, T-N, NO₃-N, PO₄-P, 유량, 유속 및 수심으로 나타났다. Method 1, 2에 의한 chl-a 회귀모형은 각각 R2 값이 0.799 및 0.790의 높은 유의성을 나타내었고 2009~2010년의 데이터로 검증하였다. Method 1에 의한 chl-a 예측모형의 training period와 validation period의 RMSE 값은 각각 20.912와 24.423으로 나타났으며 Method 2를 통한 모델은 각각 21.422 및 26.277을 나타냈다. 예측 모형 도출 결과 Method 1 및 2 모두 BOD, DO 및 PO₄-P 세 가지 인자가 주요한 역할을 한 것을 볼 때 향후 물금 지점의 조류 발생은 BOD, DO 및 PO₄-P를 중점적으로 관리할 필요가 있다고 판단된다. In this study, Chlorophyll-a (chl-a) prediction model and multiple parameters affecting algae occurrence in Mulgeum site were evaluated by statistical analysis using water quality, hydraulic and climate data at Mulgeum site (1998~2008). Before the analysis, control chart method and effect period of typhoon were adopted for improving reliability of the data. After data preprocessing step two methods were used in this study. In method 1, chl-a prediction model was developed using preprocessed data. Another model was developed by Method 2 using significant parameters affecting chl-a after data preprocessing step. As a result of correlation analysis, water temperature, pH, DO, BOD, COD, T-N, NO₃-N, PO₄-P, flow rate, flow velocity and water depth were revealed as significant multiple parameters affecting chl-a concentration. Chl-a prediction model from Method 1 and 2 showed high R2 value with 0.799 and 0.790 respectively. Validation for each prediction model was conducted with the data from 2009 to 2010. Training period and validation period of Method 1 showed 20.912 and 24.423 respectively. And Method 2 showed 21.422 and 26.277 in each period. Especially BOD, DO and PO₄-P played important role in both model. So it is considered that analysis of algae occurrence at Mulgeum site need to focus on BOD, DO and PO₄-P.
의료사고에서의 손해배상책임 ― 대법원 판례를 중심으로 ―
임지성 ( Lim Ji-sung ) 연세대학교 법학연구원 의료·과학기술과 법센터 2022 연세 의료·과학기술과 법 Vol.13 No.1
Medical demand is increasing significantly due to the rapid development of medical technology and medical level in modern society, the expansion of medical insurance, the improvement of interest in and quality of life of the people, and the extension of human life. This increase in demand for medical services eventually leads to an increase in the number of medical practices for patients by health care workers, including doctors, increasing medical accidents and resulting disputes. Although it is important for patients to recover to their daily lives and return to a stable medical environment through rapid and fair resolution of medical accidents, it is difficult for patients, who are ordinary people, to prove their negligence and causal relationship. The court is easing the burden of proof so that the liability for damages can be erased by estimating the causal relationship between medical negligence and poor results under certain standards to remedy the damage on the patient side. Even if the patient's burden of proof has been eased, the outcome of the ruling will not necessarily be guaranteed to favor the patient. If a medical dispute is resolved by a judicial method by litigation, it takes a considerable period of time to make a final decision, and in addition to financial losses such as litigation costs, mental pain during the litigation period is also great. Accordingly, outside of litigation or alternative dispute resolution (or alternative dispute resolution) in which a fair and neutral third party outside the court coordinates, arbitrates, or arbitrates the positions of both parties in a way other than a lawsuit. Representative public institutions of non-litigation dispute resolution methods to relieve victims of medical accidents in Korea include the Korea Consumer Agency under the Consumer Protection Law, and the Korea Medical Dispute Mediation and Arbitration Agency under the Medical Accident Relief and Medical Dispute Mediation Act. Through this dispute resolution organization, it is possible to resolve disputes early between the parties with fast and fair handling from the start to the end of the case and low fees. Even if both parties agree to the mediation decision, it is wise for the patient or doctor to choose an external dispute resolution method for both parties' interests before proceeding with the judicial method of litigation.
Microwave를 이용한 폐활성슬러지의 가용화 반응에서 강산과 이온성 물질의 첨가가 미치는 영향
이정민(Jeong Min Lee?),이재호(Jae Ho Lee),임지성(Ji Sung Lim),김영우(Young Woo Kim),변임규(Img Yu Byun),박태주(Tae Joo Park) 大韓環境工學會 2015 대한환경공학회지 Vol.37 No.1
폐활성슬러지의 감량화 및 혐기성소화 효율 향상을 위한 가용화 기술로 microwave (MW)에 대한 연구가 활발히 진행되고 있다. MW에 의한 가용화는 유전가열에 의해 가열적, 비가열적 효과 및 이온성 전도를 유도하여 매우 짧은 시간에 반응이 일어나므로 폐활성슬러지의 가용화에 효과적으로 적용될 수 있다. 본 연구에서는 폐활성슬러지 가용화에 대해 전도 가열대비 MW의 우수성을 평가하였고, 고출력 조건에서 수행된 기존 연구들과 달리 저출력 조건에서 MW의 효율 향상을 위해 강산인 H₂SO₄ 및 이온성 물질인 CaCl₂, NaCl을 촉매로 이용하였다. 전도 가열 대비 MW를 이용한 폐활성슬러지의 가용화 효율은 50℃ 조건에서 6.2배, 100℃ 조건에서 1.4배 높게 나타났으며, 본 연구의 MW 저출력 조건에서 최대 COD 가용화율은 10.0%로 나타났다. 동일한 MW 출력 및 반응시간 조건에서 촉매물질인 H₂SO₄ 및 NaCl의 첨가를 통해 폐활성슬러지의 COD 가용화율이 18.1%, 12.7%로 증가하였으며, CaCl₂를 첨가하였을 경우에는 COD 가용화율이 10.7%로 MW의 효율에 향상에 효과가 없는 것으로 나타났다. 이는 가용화 효율을 향상시킬 것으로 예상된 CA₂+가 슬러지 가용화에 따라 발생하는 PO₄3-와 반응하여 침전물 형성에 소모되었기 때문으로 판단된다. 본 연구에서 MW 효율 향상을 위한 가장 적합한 촉매물질은 H₂SO₄인 것으로나타났으며, 0.2 M의 H₂SO₄를 첨가한 MW 조건이 폐활성슬러지의 가용화에 가장 효과적인 것으로 나타났다. The study of waste activated sludge (WAS) solubilization has been increased for sludge volume reduction and enhancing the efficiency of anaerobic digestion. Microwave (MW)-assisted solubilization is an effective method for the solubilization of WAS because this method can lead to thermal, nonthermal effect and ionic conduction by dielectric heating. In this study, the solubilization of WAS by MW heating and conductive heating (CH) was compared and to enhance the MW-assisted solubilization of WAS at low MW output power, chemical agents were applied such as H₂SO₄ as the strong acid and CaCl₂, NaCl as the ionic materials. Compared to the COD solubilization of WAS by CH, that by MW heating was approximately 1.4, 6.2 times higher at 50℃, 100 ℃, respectively and the highest COD solubilization of WAS was 10.0% in this study of low MW output power condition. At the same MW output power and reaction time in chemically agents assisted experiments, the COD solubilization of WAS were increased up to 18.1% and 12.7% with the addition of H₂SO₄ and NaCl, however, that with the addition of CaCl₂ was 10.7%. This result might be due to the fact that the precipitation reaction occurred by calcium ion (CA₂+) and phosphate ion (PO₄ 3-) produced in WAS after MW-assisted solubilization. In this study, H₂SO₄ turned out to be the optimal agent for the enhancement of MW efficiency, the addition of 0.2 M H₂SO₄ was the most effective condition for MW-assisted WAS solubilization.