현대인들은 급격한 사회문화의 변화에 대한 적응과 극심한 경쟁 상황 속에서 항상 몸과 마음의 긴장을 느끼며 살아가고 있다. 긴장은 결국 신체적인 또는 정신적인 질병의 형태로 나타나게 된다. 이러한 문제를 해결하기 위해 본 연구자가 15여 년 동안 자기경영법을 연구하고 개발하여 교육프로그램으로 구성하였다. 본 연구에 적용한 교육 프로그램은 헬피니스 자기경영 운영체계이며, 이 교육을 통해 현대인들이 겪는 긴장, 스트레스 완화에 긍정적인 영향을 줄 수 있는지 밝히며, 자기관리와 계발 차원에서 누구나 활용하여 좋은 습관을 가지며, 개인복지에 도움이 될 수 있도록 하는데 목적이 있다. 본 연구에서 헬피니스 자기경영 운영체계 교육에 참여한 실험집단이 스트레스지각 점수가 감소하고, 직무스트레스 점수가 감소하는 유의한 결과를 내었으나 그 영향이 직무성과로 이어지는 효과성을 검증하지는 못하였다. 그러나 본 연구에서 헬피니스 자기경영 운영체계 교육이 스트레스 완화에는 영향을 줄 수 있다는 것에 의의를 둔다. 연구기간이 2주로 짧게 설계하여 직무성과로 이어지는 효과성을 검증하기에는 제한이 있었다.

Membrane distillation (MD) is a thermally driven desalination process with a hydrophobic membrane. MD process has been known to have a lower fouling potential compared to other pressure-based membrane desalination process (NF, RO). However, membrane fouling also occurs in MD process. In this study, the membrane fouling was observed in MD process according to the pre-treatment processes. The filtration and precipitation processes were applied as the pre-treatment to prevent the membrane fouling. The pore sizes of roughing filters were 0.4, 5, 10, 30, and 60 ㎛. The concentration of the coagulant was 1.2 mg/L as FeCl3. The membrane fouling on MD membrane was successfully removed with both pre-treatment processes.

The role played by reservoirs in the biogeochemical cycles of elements is a subject of ongoing debate. Recent research has revealed that reservoirs emit significant levels of greenhouse gases. To assess the importance of reservoirs in monsoon climate areas as a source of methane gas into the atmosphere, we investigated variations in organic carbon (OC) input into the reservoir, oxic state changes, and finally the amount of methane emitted (focusing on the ebullition pathway) in Lake Soyang, which is the largest reservoir in South Korea. Total organic carbon (TOC) concentrations were higher during summer after two years of heavy rainfall. The sedimentation rates of particulate organic carbon (POC) and particulate organic nitrogen (PON) were higher in the epilimnion and hypolimnion than the metalimnioin, indicating that autochthonous and allochthonous carbon made separate contributions to the TOC. During stratification, oxygen depletion occurred in the hypolimnion due to the decomposition of organic matter. Under these conditions, H2S and CH4 can be released from sediment. The methane emissions from the reservoir were much higher than from other natural lakes. However, the temporal and spatial variations of methane ebullition were huge, and were clearly dependent on many factors. Therefore, more research via a well-organized field campaign is needed to investigate methane emissions.

『現代漢語詞典』의 해석을 중심으로 ‘快’와 ‘快要’의 의미, 품사, 어법단위를 논의한 결과 ‘快’ 는 어떠한 문맥에 쓰일지라도 ‘움직이는 동작이나 일의 정황이 시간적으로 빠르다’를 의미하는 형용사로 관통되어 주로 술어, 보어, 부사어로 쓰임을 알 수 있었다. 또한 명사로서 ‘성씨’를 의미하기도 한다. 고대에는 ‘捕快’와 ‘馬快’와 같이 명사로서 ‘옛날에 체포하는 부역을 전문적으로 관리하는 것’을 의미하기도 하였다. 고대중국어의 단음절어 ‘快[기쁘다]’의 형태가 현대중국어에서는 비자립형태소로 쓰임도 확인하였다. 『現代漢語詞典』에 부사로 등재된 ‘快要’는 실제 언어 환경에서는 ‘속도가 빠르거나 길을 걷거나 시간이 짧음’을 의미하는 형용사 ‘快 [빠르다]’와 ‘～하기를 원하다’를 의미하는 동사 ‘要’가 연접되어 ‘빨리(곧) ～하려고 하다’의 문맥 의미를 형성한다. ‘快’는 동사나 형용사 술어 이외에도 수량사 술어 앞에도 쓰여 문맥상 ‘빨리(곧)～하려고 하다’라는 문의를 나타냄을 확인하였다. 현대중국어의 실제 언어 환경에서는 수량사 앞에는 ‘快’, 동사술어나 형용사술어 앞에는 ‘快要’가 주로 쓰임도 확인하였다. ‘快 要’는 ‘快[빠르다]’와 ‘要[～하기를 원하다]’ 두 단어의 연접으로 쓰인다고 여긴다.

The objective of this study was to estimate physical properties and fishing performances of net twine with improved PBS copolymer resin (Bio-new), the existing PBS/PBAT blending resin (Bio-old) and commercial Nylon (Nylon). The tensile strength of Bio-new monofilament was equal to Bio-old and the elongation of Bio-new was about 6 % higher than that of Bio-old in wet condition. The physical properties tests were carried out to estimate breaking load and stiffness in dry and wet conditions, respectively. In the results, the breaking load of Nylon netting was the highest whereas the elongation of Bio-new was 1.4 times higher than that of Nylon netting in wet condition. The breaking load of Bio-old netting was about 9.2 % higher than that of Bio-new netting. However, the elongation of the Bio-new netting was about 3% higher than that of Bio-old. The stiffness of the Bio-new compared to Bio-old was improved about 34 % in dry condition and about 32 % in wet condition. The filed experiments of the fishing performance were conducted with three kinds of drift nets with different netting materials in the coastal sea of Jeju. The each experimental drift net made of different materials showed the similar fishing performance. Bio-old drift net yielded less catches of small sized yellow croaker than other drift nets. The netting materials affected the fishing performance and length distribution of catches in the drift nets.

Membrane separation processes have been widely used in water purification or gas separation applications because of their process simplicity, low cost operation and small footprint. Nowadays, applications of ceramic membranes with high thermal, chemical and mechanical resistance has rapidly grown in new separation applications where the polymeric membranes cannot be used (e.g., high temperature, strong acidic/basic or solvent-contained corrosive feed solution). In this study, robust ceramic hollow fiber membranes were prepared by extrusion-phase inversion followed by sintering. The effects of preparation conditions on membrane characteristics were studied to improve the separation performance of ceramic membranes. In addition, a variety of modification methods and applications based on ceramic hollow fiber membranes will be discussed.

정부와 안전보건공단에서는 건설현장의 안전사고를 줄이기 위하여 감독․점검, 기술지도, 재정지원 등의 산업재해예방 활동을 지속적으로 수행하여 왔다. 하지만, 전체 산업의 사고사망만인율과 재해율이 전반적으로 감소 추세에 있는 반면에, 건설업의 사고사망만인율 및 재해율은 2014년 이후 오히려 증가 추세에 있다. 특히, 2016년 재해통계를 기준으로 전체 건설업 재해자의 약 70%가 공사금액 20억 미만의 소규모 건설현장에서 발생하였다. 이러한 소규모 건설현장의 재해를 줄이기 위해서는 현재의 산업안전보건법 상의 소규모 건설현장 산업안전보건관리체제와 고용노동부 및 안전보건공단에서 수행하고 있는 소규모 건설현장재해예방 사업에 대한 실효성을 파악하고 개선할 필요가 있다. 현 산업안전보건관리체제에서는 건축공사 기준으로 120억 이상인 공사인 경우 안전관리자를 의무 선임하도록 되어 있으며 3억에서 120억 미만 공사의 경우 재해예방지도기관의 기술지도를 받도록 되어 있다. 또한, 안전보건공단에서는 민간위탁기관을 지정하여 3억 미만 건설공사의 안전관리를 지원하고 있으며, 클린사업장 조성지원사업을 통해 20억 미만 소규모 건설현장의 추락재해예방을 위해 시스템 비계, 사다리형 작업발판 및 안전방망 등의 설치 비용을 지원하고 있다. 본 연구에서는 공사금액별 재해통계 및 안전관리자 선임관련 제도를 분석하여 안전관리자 선임 대상을 현행 건축공사 120억 이상인 공사에서 단계적으로 50억까지 확대할 것을 제안한다. 설문조사와 전문가 의견을 수렴하여 재해예방지도기관의 기술지도 영역을 조정하고 실효성을 강화하기 위한 방안을 수립하고, 클린사업장 조성지원사업의 사업 확대 요구 및 개선사항을 도출한다.

In this study, the differences of holding power according to the shape and weight distribution of concrete weight used in shellfish shell fishery were investigated through the experiments. To investigate the differences in shape, five bar-shaped concrete weights with the same length and different cross-sectional shapes were produced. The sectional shape of each weight was square, triangle, circle, small cross, and large cross (SQ, TR, CI, CR-S, CR-L). Ten rectangular parallelepiped weights with different bottom area and cross-sectional area were produced. To investigate the differences by the weight distribution, the holding power on the square model (SQ) with six 50 g weights at different positions was investigated. All the holding power was obtained by measuring the tensile force generated when the concrete weight was pulled at a constant speed on the sand. As a result, there were no differences in holding power between the ten rectangular weights. However, the experiment on weights with different cross-sectional shapes showed differences in holding power. The holding power was higher in the order of CR-L > CR-S > CI > TR > SQ. In the weight distribution test, the holding power was higher as the front side of the weight was heavier. Generally, the frictional force is the same even if the shape is different, when two objects have the same value in the weight and the roughness. On the other hand, it seems to have a large impact when the shape of the bottom is deformed in the course of pulling the object. Particularly, the larger the degree of protrusion like cruciform weights, the more the holding power increased while deeply digging the bottom. It is also likely that the holding power increases as the front weight increases.

The aim of this study was to isolate and identify marine bacterium with anti-methicillinresistant Staphylococcus aureus (MRSA) activity, and to purify the anti-MRSA compound, as well as to determine its activity and synergistic effects. Among the marine bacteria isolated in this study, the YJ-1 isolate had the strongest anti-MRSA activity. The YJ-1 isolate was identified on the basis of its biochemical characteristics and an analysis of 16S rRNA gene sequences. The YJ-1 isolate showed over 99.2% homology with Pseudomonas stutzeri, and was designated as a Pseudomonas sp. YJ-1. The optimal culture conditions were 25℃ and initial pH 7.0. For the purification of the anti-MRSA compounds, the YJ-1 was cultured in Pa PES-II medium, and the culture filtrates were extracted by ethyl acetate, hexane, and 80% MeOH. The 80% MeOH fraction was separated by a C18 ODS column, silica gel chromatography and a reverse phase HPLC, to yield three anti-MRSA agents, the MR1, MR2, and MR3 compounds. When the MR1 compound of 250 μg mL-1 concentration was applied to the MRSA cells, over 95% of bacterial cells was killed within 48 hr. Compared with vancomycin and ampicillin, the MR1 compound showed significant anti-MRSA activity. In addition, the anti-MRSA activity was increased by dose and time dependent manners. Furthermore, the combination of an MR1 compound with vancomycin produced a more rapid decrease in the MRSA cells than did the MR1 compound alone. Taken together, our results suggest that the Pseudomonas sp. YJ-1 and its anti-MRSA compounds could be employed as a natural antibacterial agent in MRSA infections.

본 연구는 기상청의 기상레이더 관측망을 이용한 하이브리드 고도면 강우추정 기법 기반의 새로운 정량적 합성강수량 추정 방법을 제시한다. HSR기법은 지형클러터, 빔차폐, 비 기상 에코 및 밝은 띠의 영향을 받지 않는 하이브리드 고도면의 반사도를 합성하는 것이 특징이다. HSR 합성반사도는 정적 HSR (STATIC)과 단일편파레이더에 대한 퍼지로직 기법과 이중편파레이더에 대한 시선방향 질감 기반의 품질관리 절차를 사용하는 동적 HSR (DYNAMIC) 합성으로 구분된다. STATIC과 DYNAMIC은 2014년 5월부터 10월까지 10개의 강우 사례에 대해 기상청 현업용 합성강우 (MOSAIC)와 비교검증 하였다. 차폐 영역에서 STATIC, DYNAMIC, MOSAIC의 상관계수는 각각 0.52, 0.78, 0.69이며 평균 상대 오차는 각각 34.08, 30.08, 40.71%로 분석되었다.

This research tried to figure out the realization effect of usage of anlauts /l/ and /n/ as nicely shown in North Korean news and to discuss the societal and lingual backgrounds from this investigation. Therefore, the research analyzed the tone of Chosun Central TV news’s announcer shown in TV news program from 2014 to 2017. With this analysis, the research tried to show the reason why there are differences in language policies regarding Korean consonant anlauts /l/ and /n/ between South Korea and North Korea and to discuss the realization effect of anlauts /l/ and /n/ after the implementation of the language policies. In chapter 2, the research considered policies for marking these consonants and gradual change for pronunciation rules and checked the reason why there is a difference In grammatical rules between North Korea and South Korea. According to previous research, exhibiting anlaut /l/ in North Korean pronunciation rules these days is not related to any historical evidence or regional dialect(Pyongyang dialect). In the environment that precedes /i/ and /j/ accepting the /n/ consonant was due to late palatalization relative to other regional dialects and also late elimination of the /n/ and therefore these objects are reflected into standard language policies in North Korea. In chapter 3, the research analyzed the realization effect of anlauts /l/ and /n/ in North Korean News. The percentage of the analut /l/ realizations was the anlaut /l/ was 83.78%, which means most of realizations were done by the anlaut /l/. Anlaut /l/ was followed by /j/, /a/, /o/, /ɛ/ and other vowels, and the percentage of anlaut /l/ used before most of the vowels was similar. For anlaut /n/ the situation that was followed by /j/ showed 21 times of the realization set and 24 times of the non-realization set, which resulted 46.6% and 53.4% respectively and illustrated similar aspects as shown in analut /l/. The realization phenomenon of anlaut /n/ occurred from the Middle Ages, and the research therefore confirmed that North Korea still uses the conservative pronunciation of the language.

In this study, an advanced form-finding method of tensegrity unit modules is presented to apply on renovation building. Here a fitness function of maximum natural frequency which can lead to a maximum stiffness status was used for a genetic algorithm. To apply the lightweight pin-jointed structure to the renovation project is more economical over to build new structures. In this paper, two types of tensegrity unit are presented to build expanded structures, and their force densities are shown using the proposed form-finding method. The expanded structures which may influence renovation projects are presented by using the tensegrity units.

The improvement of resistance performance for the 4.99 ton class fishing boats was shown. The 4.99 ton fishing boats are the most commonly used one in the Korean coastal region. The evaluation of resistance performance was estimated by the Computational Fluid Dynamics (CFD) analysis. The CFD simulation was performed by the validation for various types of bow shapes on the hull. The optimized hull form from the simulation was selected and showed the best resistance performance. This hull type was tested on the towing tank in the National Institute of Fisheries Science (NIFS). The effective horsepower (EHP) was estimated by the resistance test on the towing tank with the bare hull condition. The drag force on the three service speed conditions was obtained for the resistance analysis to power prediction. The measured drag forces are compared with the results from the CFD simulation with one another. As results of the model tests, it was confirmed that the shape of the bow is an important factor in the resistance performance. The effective horsepower decreased about 30% in comparison with the conventional hull form. Also, the resistance performance improved the reduction of required horsepower, which especially contributed to the energy-saving for the fisheries industry. In the CFD analysis, the resistance performance improved slightly. In this case, the ratio of the residual resistance (CR) in the total resistance (CT) was high. Therefore, the CFD analysis was not enough to satisfy with reflection for the free surface and wave form in the CFD procedure. Both model test and CFD calculation in this study can be applied to the initial design process for the coastal fishing vessel.

In this paper, numerical modeling is conducted to analyze the tension of an anchor line by varying the size and drag coefficient of a buoy when the trapnet is influenced by the wave and the current simultaneously. A mass-spring model was used to analyze the behavior of trapnet underwater under the influence of waves and current. In the simulation of numerical model, wave height of 3, 4, 5 and 6 m, a period of 4.4 s, and the flow speed of 0.7 m/s were used for the wave and current condition. The drag coefficients of buoy were 0.8, 0.4 and 0.2, respectively. The size of buoy was 100, 50 and 25% based on the cylindrical buoy (0.0311 ㎥) used for swimming crab trap. The drag coefficient of the trapnet, the main model for numerical analysis, was obtained by a circular water channel experiment using a 6-component load cell. As a result of the simulation, the tension of the anchor line decreased proportional to buoy’s drag coefficient and size; the higher the wave height, the greater the decrease rate of the tension. When the buoy drag coefficient and size decreased to one fourth, the tension of the anchor line decreased to a half and the tension of the anchor line was lower than the holding power of the anchor even at 6 m of wave height. Therefore, reducing the buoy drag coefficient and size appropriately reduces the trapnet load from the wave, which also reduces the possibility of trapnet loss.

In membrane applications for wastewater treatment, polymeric membranes are dominant due to their processbility and low cost. To enlarge the membrane application in industrial effluent treatment, membrane materials with high mechanical and chemical tolerance should be needed. Although ceramics such as alumina would be good options for harsh environmental conditions, high cost and complex production methods hinder the application of ceramic membranes. Here, we demonstrate the preparation of cost-effective, robust alumina hollow fiber membranes (HFMs). Alumina HFMs prepared with phase inversion method followed by sintering showed narrow pore size distribution. Also, characteristics of the membrane can be easily tuned by controlling spinning and post treatment conditions.

제지공정 폐수 내에 포함된 리그닌을 재사용하기 위해 같이 포함되어있는 금속이온을 줄여야한다. 본 연구에서는 세라믹 분리막을 이용하여 제지공정 폐수 내의 금속이온을 제거하는 연구를 진행하였다. 분리막은 DMAc 용매에 PESf 고분자를 용해시킨 뒤 α-Alumina 분말을 넣고 PVP 분산제를 첨가하여 평판형 분리막을 제조하였다. FE-SEM으로 분리막의 단면과 표면을 관찰하고 CFP (Capillary Flow Porometer)장치를 통해 기공크기를 측정하였다. 분리막을 이용 한 금속이온제거 실험을 한 뒤 실험 전, 후의 폐수를 ICP-MS분석을 통해 금속 이온량을 측정하였다.