본 연구는 IMO 선박평형수관리협약과 관련하여 선박평형수처리시스템(BWMS) 산업에 대한 한국의 산업경쟁력 현황과 향후 발전방향을 제언하기 위하여, BWMS 관련 무역데이터를 기반으로 현시비교우위지수와 무역특화지수로 비교·분석하였다. 친환경선박에 대한 국제적 관심이 확대됨에 따라 IMO는 선박기인 오염물질 해양배출과 관련된 논의 및 협정 체결이 지속적으로 증가하고 있다. 동 협약의 이행국가들은 BWMS 산업이 높은 시장진입 장벽과 선도 시장진입자의 시장점유율 확대를 위해 경쟁하고 있으며 BWMS는 친환경선박 분야의 주요산업으로서 각 국가는 기술개발 및 산업경쟁력확보를 위해 노력하고 있다. 한국은 2019년 10월 기준(BWM.2/Circ.34/Rev.8) 최종 승인 받은 BWMS 전체 45개 중 17개(약 38 %)를 차지하고 있다. 동 산업의 시장점유 현황을 파악하기 위하여 상품코드 HS842219, HS84212, HS89가 부여된 무역데이터를 기반으로 현시비교우위지수와 무역특화지수를 산출 및 비교한 결과, 한국은 전 세계 대상으로 BWMS 시장 점유가 비교우위이나 독일, 덴마크 등의 국가에 비해서는 상대적 열위인 것으로 분석되었다. 그럼에도 불구하고 다수의 IMO 승인기술 건 수, 국내 승인기관 보유 등의 산업생태계가 조성되어 있어 향후 BWMS 시장 경쟁력이 강화될 가능성이 높은 것으로 분석되었다.

본 연구에서는 13종의 밥류, 11종의 면류, 그리고 15종 의 소스류에 함유되어 있는 수용성 비타민 B1 (thiamin), B2 (riboflavin), 그리고 B3 (niacin)의 함량을 확인하였다. 실험 결과에 대한 신뢰도를 확인하기 위해 검출한계(LOD) 와 정량한계(LOQ)를 확인하였으며, 표준인증물질(SRM 1849a)을 통한 결과의 정확도를 확인하여 우수한 지표를 나타내었다. Thiamin에서 밥류의 경우 잡채밥이 가장 높은 함유량을 확인하였고, 면류의 경우 막국수, 그리고 소스류의 경우 토마토 스파게티소스가 가장 높은 함유량을 확인하였다. Riboflavin은 밥류의 경우 짜장밥, 면류의 경우 비빔국수, 소스류의 경우 강황카레 약간 매운맛에서 가장 높은 함유량을 확인하였다. Niacin에서는 밥류, 면류, 그리고 소스류에서 각각 치킨볶음밥, 잔치국수, 짜장 소스에서 가장 높은 함유량을 확인하였다. 한국인 성인 남녀의 수용성 비타민 1일 섭취권장량에 대하여 식품에 함유되어 있는 양을 확인한 결과 강황카레 약간 매운맛에서 가장 높은 riboflavin의 함량이 남자의 경우 217.40%, 여자의 경우 271.75%로 가장 높은 함량을 확인하였다. 본 연구를 통해서 밥류, 면류, 그리고 소스류에 함유된 수용성 비타민에 대한 영양성분 데이터베이스를 구축하고, 1일 섭취권장량에 대한 식품에 함유된 수용성 비타민의 함량 확인을 통해 국민 식생활에 필요한 자료를 제공하고자 한다.

The purpose of this study was to determine the contents of water-soluble vitamins B1 (thiamine), B2 (riboflavin), B3 (niacin) and B12 (cyanocobalamin) in seafood-based dishes by using the high-performance liquid chromatography with the ultra violet and fluorescence detector. The vitamin B1, B2, B3 and B12 contents were analyzed in 29 seafood-based dishes. The method validation was performed on the method to determine the linearity, accuracy, limits of quantification, limits of detection and precision for vitamin B1, B2, B3 and B12. An excellent linearity range (R2=0.999~1.000) in the calibration curve for the water-soluble vitamins was observed. All analytical methods for the water-soluble vitamins showed the acceptable accuracy (89.4~119.7% recovery) and the precision (0.6~4.8% repeatability and 1.0~4.2% reproducibility). The highest content of vitamin B1 was 2.646 mg/100 g in the kkongchi-jorim, and the highest contents of vitamin B2, B3 and B12 were 0.370 mg/100 g, 10.971 mg/100 g, and 17.193 μg/100 g, respectively, in the kkongchi-gui. Our results provide reliable data on the contents of the water-soluble vitamins of seafood-based dishes in Korea.

This study was designed to evaluate the improvement in exercise endurance by Hovenia dulcis fruit hot water extract (HDWE) for the potential application as a functional food material. The effect was based on the evaluation of the forced-swimming capacity and changes in biochemical parameters in mice. Six-week-old mice were classified into four groups based on a randomized block design: the negative control group, the HDWE 50 mg/kg body weight group, the HDWE 200 mg/kg body weight group, and the 1-octacosanol 50 mg/kg body weight group (n=8 mice per group). The swimming exercise time in the HDWE-50 group was increased at 545±43 sec compared to the control group at 263±28 sec. The HDWE-200 fatigue indicators, lactate acid and ammonia content, decreased to 4.99±0.33 mg/mL and 0.63±0.05 mg/mL, respectively. In addition, the content of glycogen in the liver and muscle tended to increase in the group administered HDWE but was not significant. Likewise, the LDH and glucose contents were increased compared to the control group. The muscle damage indicators ALT (52.7±2.6 U/L) and AST (42.5±5.2 U/L) tended to decrease compared to the control group (76.4±10.2 U/L).

In this study, we performed algorithms to predict algae of Chlorophyll-a (Chl-a). Water quality and quantity data of the middle Nakdong River area were used. At first, the correlation analysis between Chl-a and water quality and quantity data was studied. We extracted ten factors of high importance for water quality and quantity data about the two weirs. Algorithms predicted how ten factors affected Chl-a occurrence. We performed algorithms about decision tree, random forest, elastic net, gradient boosting with Python. The root mean square error (RMSE) value was used to evaluate excellent algorithms. The gradient boosting showed 10.55 of RMSE value for the Gangjeonggoryeong (GG) site and 11.43 of RMSE value for the Dalsung (DS) site. The gradient boosting algorithm showed excellent results for GG and DS sites. Prediction value for the four algorithms was also evaluated through the Receiver operating characteristic (ROC) curve and Area under curve (AUC). As a result of the evaluation, the AUC value was 0.877 at GG site and the AUC value was 0.951 at DS site. So the algorithm‘s ability to interpret seemed to be excellent.

In this study, air scouring cleaning was selected and applied among 5 small blocks (S1~S5) in domestic S cities to analyze the cleaning effect of particles causing discoloration. In order to identify the cleaning effect, 10 locations were selected as water quality investigation point, such as the stagnant or water mains ends. Removal of solids, variation of particle components, weight and concentration were analyzed. And the level of the cleanness of the surface inside water mains using endoscope was investigated. As a result of analysis, the solids discharged after cleaning were mainly sand and gravel, pieces related to pipe materials, and corrosion products. As a result of analyzing the concentrated particles of the filter before and after cleaning, it was found that the change in discoloration on the filter was large. In addition, as a result of comparing the weight and the concentration of the particles, it was found that the particles causing discoloration were significantly removed after cleaning. From the results of the endoscopy, it was confirmed that most of the precipitated and accumulated dark yellow discoloration matters inside water mains were removed through cleaning. Therefore, it seems that the particles causing discoloration in water decreased after cleaning. Therefore, it is expected that, if properly cleaning was applied, matters that cause discoloration can be removed from the water mains, and customer's complaints can also be reduced through water quality improvement.

In this study, effects of five raw water quality parameters (turbidity, odor compounds caused by algae, filter clogging caused by algae, pH increase caused by algae, and organic matter) on improvements and operations costs of typical water treatment plant (WTP) were estimated. The raw water quality parameters were assumed the worst possible conditions based on the past data and costs were subsequently estimated. Results showed that new water treatment facilities were needed, such as a selective intake system, an advanced water treatment processes, a dual media filter, a carbonation facility, and a re-chlorination facility depending on water quality. Furthermore, changes needed to be made in WTP operations, such as adding powered activated carbon, increasing the injection of chlorine, adding coagulation aid, increasing the discharge of backwashed water, and increasing the operation time of dewatering facilities. Such findings showed that to reliably produce high-quality tap water and reduce water treatment costs, continuous improvements to the quality of water sources are needed.

Species composition and seasonal variations of fish in the Five West Sea Islands in Korea, were investigated by using otter trawls and bongo nets from 2014 to 2015. During the surveyed period using an otter trawl, a total of 53 species, 147,253 ind./km2 and 2,721,296 g/km2 of fish were collected by otter trawls. The individual dominant species were Chaeturichthys stigmatias (30.3%), Coilia nasus (18.2%), Engraulis japonicus (12.3%), and Setipinna tenuifilis (12.2%). Moreover, the biomass dominant species in biomass were Liparis tanakae (21.3%), Beringraja pulchra (18.5%), Engraulis japonicus (8.3%) and Okamejei kenojei (8.1%). Eggs by bongo nets included 1,748 ind./1,000 m3 of Engraulis japonicus and 64,691 ind./1,000 m3 of unidentified species. A total of 15 species and 2,015 ind./1,000 m3 of fish larvae were collected, and the dominant species were Johnius belengerii and Pholis fangi.