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Jang, Dong-Doo,Jung, Hyung-Jo,Moon, Yeong-Jong Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.2
This paper numerically investigates the feasibility of an active mass damper (AMD) system using the time delay control (TDC) algorithm, which is one of the robust and adaptive control algorithms, for effectively suppressing the excessive vibration of a building structure under wind loading. Because of its several attractive features such as the simplicity and the excellent robustness to unknown system dynamics and disturbance, the TDC algorithm has the potential to be an effective control system for mitigating the vibration of civil engineering structures such as buildings and bridges. However, it has not been used for structural response reduction yet. In this study, therefore, the active control method combining an AMD system with the TDC algorithm is first proposed in order to reduce the wind-induced vibration of a building structure and its effectiveness is numerically examined. To this end, its stability analysis is first performed; and then, a series of numerical simulations are conducted. It is demonstrated that the proposed active structural control system can effectively reduce the acceleration response of the building structure.
Jang, Ki-Chang,Lee, Jin-Hwan,Kim, Seong-Cheol,Song, Eun-Young,Ro, Na-Young,Moon, Doo-Young,Um, Yeong-Cheol,Park, Ki-Hun The Korean Society for Applied Biological Chemistr 2007 Journal of Applied Biological Chemistry (J. Appl. Vol.50 No.1
1-C-(p-Hydroxyphenyl)-glycerol (1) was isolated and purified by column chromatography and recrystallization from the rhizome of Trichosanthes kirilowii, firstly in this species. Isolated compound showed inhibitory effects on the growth of five bacteria (Bacillus cereus, Escherichia coli, Streptococcus faecalis, etc) completely at the concentration higher than 10 ppm as well as delayed the growth of three bacteria (Bacillus substilis, Staphylococcus aureus, Pseudomonas aeroginosa) at the concentration of 25 ppm for 60 h. Moreover, this compound showed potent antioxidant activity against DPPH radical ($IC_{50}$ = 56.0 ppm)
이두웅 ( Doo Woong Lee ),권준현 ( Junhyun Kwon ),양지은 ( Jieun Yang ),주영준 ( Yeong Jun Ju ),박은철 ( Eun-cheol Park ),장성인 ( Sung-in Jang ) 한국보건행정학회 2020 보건행정학회지 Vol.30 No.1
Suicide has been a long-standing problem for global public health, along with almost 800,000 deaths from suicide worldwide in 2016, accounting for 1.4% of all deaths. South Korea was ranked first in suicide mortality in 2018 among countries in the Organization for Economic Cooperation and Development. This study aimed to suggest up-to-date information about suicide-related indicators such as the rate of suicidal ideation, suicide attempt, and suicide death, and its trends by applying sampling weight to make it nationally representative. In this study, we used the data sources: Korea National Health and Nutrition Examination (KNHANES, ‘07-13, ‘15-18), Korean Community Health Survey (KCHS, ‘08-09, ‘13, ‘17), Korean Wealth Panel Study (KOWEPS, ‘12-18), Korea Health Panel Survey (KHP, ‘10-13), and Statistics Korea (1983-2017). The rate of suicidal ideation as recent year was 4.73% (KNHANES, ‘17), 6.96% (KCHS, ‘17), 2.29% (KOWEPS, ‘18), and 5.39% (KHP, ‘13). That of suicide attempt as recent year was 0.51% (KNHANES, ‘18), 0.32% (KCHS, ‘17), and 0.15% (KOWEPS, ‘18). Annual percentage change (APC) of suicidal ideation was -15.4% (KNHANES, ‘07-13, ‘15, ‘17), -2.5% (KCHS, ‘08-09, ‘13, ‘17), -10.8% (KOWEPS, ‘12-18), and -10.9% (KHP, ‘10-13). APC of suicide attempt was -4.4% (KNHANES, ‘07-13, ‘15-18), -4.4% (KCHS, ‘08-09, ‘13, ‘17), and -13.6% (KOWEPS, ‘12-18). APC of death by intentional self-harm was -1.25% (Statistics Korea, ‘07-18). All suicide-related indicators were found to be decreasing in the overall from 2009. Individuals with lower income level were more likely to experience suicidal ideation and suicide attempts. Even though suicide rate had been continuously decreasing from its highest point in 2011 (suicide rate: 31.7 per 100,000 population) to 2017 (suicide rate: 24.3 per 100,000 population), it increased again in 2018 (suicide rate: 26.6 per 100,000 population). This information would be grounded on policy implementation for suicide prevention, thus continuous data observation is necessary.
하계 북서태평양 해역 어류 군집 : 유자망 시험어구에 채집된 어획물 중심으로
이장욱,박영철,안두해 한국수산자원학회 1998 한국수산자원학회지 Vol.1 No.-
A study on the fish community was carried out on the basis of fishery and oceanographic data collected from a research driftnet on board R/V Pusan 851(1,126 tons) of NFRDI in a wide area from the North Pacific Ocean(152° E~180°, 35°N~45°N) from July to August 1989. Water temperature and salinity in the survey are showed a large fluctuation ranging 10~27°C and 32.6~34,4 psu, respectively. Some commercially important species showed their own distribution limit L the neon flying squid (Ommastrephes bartrami) bound on the north by 43°N while the Pacific saury(Cololabis saira) and sardine(Sardinops melanostictus) distributed mainly on high latitudes and lower in high latitudes. Analysis of dendrogram of the clustering showed that three were three distinct groups at the 0.5 level of the correlation similarity index of species composition.
비트(Beta vulgaris L) 중 Neonicotinoid계 살충제 Acetamiprid 및 Flonicamid의 안전사용기준 설정 및 안전성 평가
조영주 ( Yeong-ju Jo ),변건두 ( Geon-doo Byeon ),최정윤 ( Jeong-yoon Choi ),허장현 ( Jang-hyun Hur ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-
소면적 재배작물 중 비트(Beta vulgaris L.)는 잎과 뿌리 전체에 대한 식용이 증가하고 있는 웰빙 작물으로 수요가 급증함에 따라 재배 농가가 증가하고 유통이 활발해지고 있다. 비트는 재배기간 중 가루이 등에 대한 피해가 다수 발생하고 있어 이를 방제하기 위한 살충제 등록이 필요한 실정이다. 본 연구에서는 신경전달을 저해하는 neonicotinoid계 살충제인 acetamiprid 및 flonicamid를 선정하여 작물 잔류성 시험을 진행하였으며, 이를 통해 소면적 재배작물 비트를 위한 농약 안전사용기준과 잔류허용기준을 제안하고자 하였다. 포장시험을 위한 약제살포는 acetamipird 10% 액제와 flonicamid 50% 입상수용제를 각각 2,000배 및 10,000배 희석하여 수확 전 0, 7, 14, 21일 차에 걸쳐 7일 간격 2회 경엽처리 하였다. 잔류분석용 시료는 비트의 지상부와 지하부로 구분하여 채집하였으며 즉시 세절한 후 -20℃ 냉동보관하였다. 시료 분석은 QuEChERS 분석법을 적용하였고, flonicamid의 경우 추가적인 정제를 위해 SPE-NH2 cartridge를 이용하였으며, 분석기기는 acetamiprid는 LC-MS/MS, flonicamid는 GC-ECD를 사용하였다. Acetamiprid 및 flonicamid의 분석법 정량한계(Method limit of quantitation, MLOQ)는 모두 0.01 mg/kg이었다. 회수율은 정량한계의 1배 및 10배 수준으로 각각 3반복 수행하였으며 지상부의 경우 acetamiprid는 87.6∼105.8%, flonicamid는 72.6∼111.1%이었으며, 지하부의 경우 acetamiprid는 84.1∼108.0%, flonicamid는 93.0∼102.8%로 유효 회수율 범위인 70∼120%을 만족하였다. 비트 중 지상부 및 지하부의 최대잔류량은 acetamiprid 의 경우 0일 차에서 5.93 mg/kg와 0.09 mg/kg, 21일 차에서 1.25 mg/kg와 <0.01 mg/kg으로서 경시변화에 따라 모두 감소하는 경향이었다. Flonicamid의 경우 0일 차에서 6.00 mg/kg와 0.10mg/kg, 21일 차에서 0.73 mg/kg와 0.02 mg/kg로 검출되어 acetamiprid의 경우와 비슷한 감소 경향을 보였다. 이러한 결과를 바탕으로 비트에 대한 acetamiprid 10% 액제와 flonicamid 50% 입상 수용제의 안전사용기준(안)은 모두 수확 14일 전 2회 경엽처리로 제안하였다. 또한 잔류허용기준은 지상부 5.0 mg/kg, 지하부 0.05 mg/kg로 제안하였고 ADI 대비 식이섭취율(%ADI)은 acetamiprid 및 flonicamid 각각 14.81%, 56.98%로 두 약제 모두 80% 초과하지 않아 식이섭취에 따른 안전성 을 확인하였다. 따라서 본 연구에서 추천한 안전사용기준(안)을 토대로 농약을 살포한다면 소면적 재배작물 비트 재배 중 가루이류 방제에 효과적으로 활용될 뿐만 아니라 우리나라 잔류농약 안전 관리에 도움이 될 것으로 사료된다.
음주력이 Enflurane 마취하 위절제술을 받은 환자에서 AST, ALT 에 미치는 영향
김두식,김세환,김경한,류시정,장태호,박세훈,이근영 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.38 No.5
Bsckground : There are many factors including the operation site, duration of anesthesia, preoperative liver function and hepatitis, which cause postoperative hepatic dysfunction. The purpose of this study is to evaluate postoperative liver function with respect to a history of alcohol intake. Methods : Seventy-five patients were divided into 2 groups: 44 patients without alcohol intake (non-alcohol group), 31 patients with alcohol intake (alcohol group). All patients were anesthetized with about 1.5 vo1% of enflurane combined with 50% nitrous oxide and 50% oxygen. AST (aspartate aminotransferase) and ALT (alanine aminotransferase) were measured before anesthesia, 1, 3 and 7 days after surgery in both groups, respectively. Postoperative AST and ALT values were compared to preope- rative values within each group, and were also compared between groups. Results : In the alcohol group, postoperative AST and A.LT values were significantly higher than preoperative values (P $lt; 0.05). In addition, postoperative ALT values significantly increased in the 1st and 7th day over the upper normal limit of ALT (P $lt; 0.05). In the non-alcohol group, postoperative AST and ALT values increased over preoperative values, but those levels were within the normal limits of AST and ALT. Conclusions : The data suggest that when surgery can reduce hepatic blood flow, patients with a history of alcohol ingestion may have a risk of raised liver-derived enzyme in the first seven postoperative days. (Korean 3 Anestbesial 2000; 38: 817~822)