A conventional porous carbon is still a very promising material for the removal of gaseous pollutants because of its abundant surface functional groups and a high specific surface area. Here, we prepared an environment-friendly uniform N-rich narrow micropore activated carbon, for the removal of formaldehyde, based on steam activation and N-rich with chitin as the starting material. A sample carbonized at 500 °C and steam activated at 800 °C (CAC800) showed a reasonable yield (55%) with uniform and narrow micropores without mesopores but having a balanced nitrogen functionality. CAC800 possesses outstanding formaldehyde removal capabilities under both dry and wet (humidity 45%) conditions. In addition, when compared with commercial activated carbon materials, we clearly demonstrated that the existence of high nitrogen content with uniform and narrow micropores simultaneously removed formaldehyde, effectively.

To solve the problem of water pollution, researchers have proposed a photocatalytic degradation technology, in which the key factor is the development of efficient photocatalytic materials. Graphitic carbon nitride (g-C3N4), an n-type semiconductor, has been widely studied due to its suitable band gap (2.7 eV), low cost, easy preparation, non-toxicity, and high photostability. However, the pure-phase g-C3N4 still has defects such as low specific surface area, insufficient visible light absorption, low charge mobility, few active sites for interfacial reaction, and easy recombination of photogenerated electron–hole pairs, which leads to the lower photocatalytic activity of g-C3N4. Aiming at the problems mentioned above, this paper focus on the synthesis of g-C3N4-based composites with high photocatalytic activity via lemon juice induction method. Thiourea and lemon juice were selected as precursors, and carbon quantum dots (CQDs) as electron mediators were introduced anchoring on the surface of g-C3N4 to build g-C3N4/CQDs with compact interface. The results showed that small-sized CQDs are uniformly distributed on the surface of g-C3N4, and the g-C3N4/CQDs composite has a 2D0D structure, which reduces the recombination of photogenerated electron–hole pairs. The photocatalytic degradation efficiency of 4% g-C3N4/CQDs for RhB reaches the highest data of 90.9%, and the photocatalytic degradation rate is 0.016 min− 1, which is about 2.3 times that of g-C3N4. After four cycles of photocatalytic reaction, the photocatalytic degradation efficiency of the material remained at 81.7%. Therefore, the g-C3N4/CQDs synthesized via lemon juice induction has a more stable microstructure, and the charge separation efficiency is greatly improved, which is suitable for practical photocatalytic environmental protection.

We report the synthesis and gas sensing properties of bare and ZnO decorated TeO2 nanowires (NWs). A catalyst assisted-vapor-liquid-solid (VLS) growth method was used to synthesize TeO2 NWs and ZnO decoration was performed using an Au-catalyst assisted-VLS growth method followed by a subsequent heat treatment. Structural and morphological analyses using X-ray diffraction (XRD) and scanning/transmission electron microscopies, respectively, demonstrated the formation of bare and ZnO decorated TeO2 NWs with desired phase and morphology. NO2 gas sensing studies were performed at different temperatures ranging from 50 to 400 oC towards 50 ppm NO2 gas. The results obtained showed that both sensors had their best optimal sensing temperature at 350 oC, while ZnO decorated TeO2 NWs sensor showed much better sensitivity towards NO2 relative to a bare TeO2 NWs gas sensor. The reason for the enhanced sensing performance of the ZnO decorated TeO2 NWs sensor was attributed to the formation of ZnO (n)/ TeO2 (p) heterojunctions and the high intrinsic gas sensing properties of ZnO.

One of the promising candidates for heat transfer fluid is molten chloride salts. They have been studied in various fields such as the electrolyte of pyroprocessing, the molten salt reactor coolant, and the energy storage system media. Main considerations for utilizing molten chloride salts are the compatibility of salts with structural materials. The corrosion behavior of structural materials in molten chloride salts must be understood to identify suitable materials against the corrosive environment. In this study, the corrosion behavior of a candidate structural material, Hastelloy N, in molten LiCl- KCl salt at 500°C were investigated by the electrochemical impedance spectroscopy (EIS) method. The sheet type of Hastelloy N was utilized as the working electrode in LiCl-KCl to measure the EIS data for 100 hours with 5 hours of time intervals. The EIS data were measured in the frequency range from 104 Hz to 10-2 Hz with the AC signal (amplitude = 20 mV) at open circuit potential. The capacitance semicircle observed in Nyquist plots for all periods indicates that charge-transfer controlled reactions occur. As the immersion time progresses, the radius of the semicircle in Nyquist plots and the impedance and phase angle in Bode plots decrease. These behaviors suggest a decreasing reaction resistance and the corrosion reactions are accelerated with the immersion time. The EIS data were fitted using the equivalent circuit to achieve quantitative results. Two capacitor-resistor components were considered due to the overlapped shape of two valleys in phase angle. The depressed shape of the semicircle in Nyquist plots led to the use of the constant phase element(Q) instead of the capacitor. Therefore, R(Q(R(QR))) circuit was selected to fit the EIS data. Fitting results show that the charge transfer resistance decreases dramatically within 1 day and then converges. The film resistance shows no clear trends, but the increase of the film admittance value indicates the decreased film thickness. Consequently, the film appears to exist like the oxide layer but it does not act as a protective layer. The real-time EIS data were measured in molten salt and provides the corrosion behavior over time. The corrosion mitigation strategy should consider that the corrosion of Hastelloy N accelerates over time and its intrinsic film cannot act as the protective layer. The next steps of this study are to evaluate other candidate structural materials and to demonstrate the presence of the film.

Excess nitrogen (N) flowing from livestock manure to water systems poses a serious threat to the natural environment. Thus, livestock wastewater management has recently drawn attention to this related field. This study first attempted to obtain the optimal conditions for the further volatilization of NH3 gas generated from pig wastewater by adjusting the amount of injected magnesia (MgO). At 0.8 wt.% of MgO (by pig wastewater weight), the volatility rate of NH3 increased to 75.5% after a day of aeration compared to untreated samples (pig wastewater itself). This phenomenon was attributed to increases in the pH of pig wastewater as MgO dissolved in it, increasing the volatilization efficiency of NH3. The initial pH of pig wastewater was 8.4, and the pH was 9.2 when MgO was added up to 0.8 wt.%. Second, the residual ammonia nitrogen (NH4 +-N) in pig wastewater was removed by precipitation in the form of struvite (NH4MgPO4·6H2O) by adjusting the pH after adding MgO and H3PO4. Struvite produced in the pig wastewater was identified by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) analysis. White precipitates began to form at pH 6, and the higher the pH, the lower the concentration of NH4 +-N in pig wastewater. Of the total 86.1% of NH4 +-N removed, 62.4% was achieved at pH 6, which was the highest removal rate. Furthermore, how struvite changes with pH was investigated. Under conditions of pH 11 or higher, the synthesized struvite was completely decomposed. The yield of struvite in the precipitate was determined to be between 68% and 84% through a variety of analyses.

본고는 중국의 정책·공약 표제에서 자주 활용되는 ‘수+个+X’ 형식의 내부 구성을 분석하고, ‘수+个+X’의 활용이 가져오는 효과에 대해 살펴보았다. ‘수+个+X’는 전형 적인 수량사 조합을 탈피한 형식으로 ‘수’는 정책·공약 세부내용에 나열된 항목의 총 개수를 나타내며, ‘X’는 (동사, 부사, 수사)조합, 형용사, 대명사, 접속사, 기타(사자성 어, 기호 등)의 형식으로 정책 항목에서 반복적으로 출현하거나 핵심 되는 단어이다. 그러나 개중에는 전혀 내용을 추측할 수 없는 단어나 기호도 출현하는데 이러한 모 순적인 구성이 오히려 더 많은 궁금증과 호기심을 유발하는 효과를 가진다.

This study analyzed the performance of the national fishing port development project, which lacked ex-post impact evaluation despite a lot of investment in terms of fishery income opportunities. Using micro data from the Census of Agriculture, Forestry, and Fisheries, the sales amount of fishery products and the proportion of fishery-related businesses were used as performance indicators. The fishery households in the fishing port area (treatment group) and those not in the area (control group) were classified through data pre-processing, and factors unrelated to the fishing ports were controlled using the propensity score matching difference-in-difference method. The analysis target is six fishing ports with large investment in from 2010 to 2014. As a result of the analysis, it was confirmed that the sales of fishery products increased significantly in four of the six fishing ports, and the proportion of fishery-related businesses increased in two fishing ports. The analysis method of this study can be fully utilized in the evaluation of the Fishing Community New Deal 300 Project, which is in need of performance analysis.

Efforts to prevent IUU fishing began in 1996 as the IUU Antarctic Marine Living Resources Conservation Committee reported the multilateral efforts of the international community and related international organizations to prevent IUU fishing. Korea has recently been pointed out by the international community as to many problems regarding its will to eradicate IUU fishing. It is true that Korea has ever been designated as an ‘IUU participating country’ or a ‘non-cooperative third country’ by the international community and that there have been considerable difficulties in exporting seafood and using ports along with the deterioration of the national image. In 2020, with the efforts of related organizations and fisheries companies, Korea is now free from being known as a that Korea has recovered some degrees of trust from the international community through strengthening legal sanctions against IUU fishing and thorough implementation of follow-up measures is now free from non-cooperating country it cannot be said that the basic problems have been completely resolved just because it has emerged as a disgraceful country, and the current state of IUU fishing of Korea leaves a room for designation as a ‘non-cooperative third country’ again at any time in the future. Accordingly, there is an urgent need to examine the problems of the IUU fishing-related legal system in Korea and to come up with an improvement plan. Therefore, this paper reviews international norms for IUU fishing regulation (PSMA etc.) and domestic laws with the Distant Water Fisheries Development Act and Propose the improvement methods for related legal systems in Korea.

불공정무역조사법 제4조 제1항 각 호에서는 우리나라 무역위원회의 조 사 대상이 되는 불공정무역행위 유형에 대하여 규정하고 있으며, 이 중 제1호에서 지식재산권 침해 물품 등의 국내 수입, 수출 행위 등을 규정하 고 있다. 불공정무역조사법상 지식재산권 침해 행위에는 특허권, 실용신안 권, 디자인권, 상표권, 저작권, 저작인접권, 출판권, 데이터베이스 제작자 의 권리 및 반도체집적회로의 배치설계권이나 지리적 표시 및 지리적 표 시권 또는 영업비밀 침해까지 포함되나, 부정경쟁방지법상의 부정경쟁행 위는 규정하고 있지 않다. 불공정무역조사법상의 조사와는 별도로 부정경쟁방지법에서는 부정경쟁 행위 조사제도를 운영하고 있는데, 이를 무역위의 불공정무역행위 조사제 도와 비교해 보고, 불공정무역조사법상 조사대상이 되는 지식재산권 침해 범위에 부정경쟁행위의 추가여부의 타당성, 적절성을 검토해 볼 필요가 있다. 이를 위해 본 연구에서는 먼저 불공정무역조사법과 부정경쟁방지법 상의 조사제도를 비교분석하고, 각 제도의 운영 실태 및 현황을 조사하여 분석하였다. 다음으로 해외 주요국에서 불공정무역행위 조사제도의 현황 및 관련 법규를 조사하여, 해외에서 불공정무역 조사대상에 부정경쟁행위 를 포함하고 있는 사례를 살펴보았다. 이를 통해 불공정무역조사법상 지 식재산권 침해 범위에 부경법상 부정경쟁행위의 추가여부의 타당성을 법 리적으로 검토하고, 관련 고려사항을 제시하였다.

나디는 생명에너지의 통로로써 요가의 완성과 관련된 핵심 용어이다. 나디는 그 존재의 유무를 파악하기 힘들지만 내부순환이 이루어지는 통로이며 나디를 통해 생명에너지의 내부 순환이 일어나기 때문에 생명활동의 시작과 지속과 마침에 영향을 미친다. 이처럼 나디는 요가의 완성과 생명활동에 중요한 역할을 하지만 나디가 차지하는 위상은 그 중요성에 비해 저평가되었다. 나디는 8-9세기 이후 하타 요가가 성립된 시기에 삼매를 성취하는데 중요한 위치로 부각된다. 나디는 이 시기에 이르러서야 이론적으로 체계화된 것으로 보인다. 9-10세기에 성립된『요가야갸발꺄』에서는 나디의 체계와 나디 정화의 조건, 방법, 기간 등을 자세히 설명한다. 요가수행에서 나디가 중심적이고 결정적인 위치를 차지하고 있는 것은 나디의 정화이다. 나디가 정화되지 않고 불순물로 가득 차 있다면 생명에너지는 수슘나 나디를 통해 상승할 수 없다. 나디를 정화해야만 수행의 궁극적 목표를 실현할 수 있다.『요가야갸발꺄』에서는 나디 정화의 전제조건과 장소 및 방법 등 자세히 소개되고 있다. 본 논문에서는『요가야갸발꺄』에서 설명된 나디 정화를 원문을 통해 연구하고자 한다.