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        검색결과 7,880

        402.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The dyeing process is a very important unit operation in the leather and textile industries; it produces significant amounts of waste effluent containing dyes and poses a substantial threat to the environment. Therefore, degradation of the industrial dye-waste liquid is necessary before its release into the environment. The current is focusing on the reduction of pollutant loads in industrial wastewater through remediating azo and thiazine dyes (synthetic solutions of textile dye consortium). The current research work is focused on the degradation of dye consortium through photo-electro-Fenton (PEF) processes via using dimensionally stable anode (Ti) and graphite cathode. The ideal conditions, which included a pH of 3, 0.1 (g/L) of textile dye consortium, 0.03 (g/L) of iron, 0.2 (g/L) of H2O2, and a 0.3 mAcm-2 of current density, were achieved to the removal of dye consortium over 40 min. The highest dye removal rate was discovered to be 96%. The transition of azo linkages into N2 or NH3 was confirmed by Fourier transforms infra-red spectroscopic analysis. PEF process reduced the 92% of chemical oxygen demand (COD) of textile dye consortium solution, and it meets the kinetics study of the pseudo-first-order. The degradation of dye through the PEF process was evaluated by using the cyclic voltammetric method. The toxicity tests showed that with the treated dye solution, seedlings grew well.
        4,800원
        403.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In this research, reduced graphene oxide/polypyrrole (rGO/PPy) particles were synthesized and used to measure the amount of dopamine (DA) electrochemically. The obtained rGO/PPy particle was characterized by Fourier Transform Infrared Spectrophotometer (FTIR), UV–Visible Spectrophotometer (UV–Vis), and X-Ray Diffraction Diffractometry (XRD). To investigate the DA sensor performance, cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to acquire electrochemical measurements of the sensor. Current values of 1.65 and 5.9 mA were observed in the CV at 0.2 mM and 1.2 mM concentrations of target molecule, respectively. Under optimized conditions, the linear calibration plots were found to exhibit significant sensitivity in the linear range of 0.2 and 1.2 mM, with a corresponding detection limit of 0.061 μM for DA. The results obtained were similar to the sensor results of DA made using precious metals. This work was a demonstration of the feasibility of high-sensitivity electrochemical analysis with conductive carbon materials without the use of precious metals. It was also observed that the cost-effective rGO/PPy exhibited a very high potential for DA detection.
        4,000원
        404.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Modification of the surface of raw activated carbon using chemical solvents can significantly improve the adsorption performance of activated carbon. Triethylenetetramine is one of the most important chemical solvents used to modify raw activated carbon for formaldehyde removal indoor. We conducted the liquid impregnation experiments at different initial concentrations, temperatures, adsorbent dosage and time ranges to fully investigate the adsorption of triethylenetetramine on the surface of raw activated carbon for modification. We found that the Langmuir isotherm model and pseudo-first-order kinetic model fit quite well with the experimental data and the R2 are 0.9883 and 0.9954, respectively. The theoretical maximum adsorption capacity is 166.67 mg/g. The change in Gibbs free energy (ΔG0), enthalpy change (ΔH0) and entropy change (ΔS0) were also calculated to study the direction and driving force of the liquid adsorption process. In order to understand the adsorption process at the molecular level, a new activated carbon model based on the actual physical and chemical properties of activated carbon was carefully established in the Materials Studio to simulate the liquid-phase adsorption. The pore structure, elemental composition, functional group content, density, pore volume, and porosity of the activated carbon model converge close to the actual activated carbon and the adsorption isotherms obtained from the simulation agree well with the experimental results. The results show that the adsorption of triethylenetetramine on activated carbon is a spontaneous, endothermic and monolayer physical adsorption process.
        4,800원
        405.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Energy storage for sustainable development and progress of power production industries is vitally important. The energy storage devices are under extensive research from last three decades to ensure the hand-on-hand coordination with power supply phenomenon and to reduce the energy loses in lines. The cost-effective materials are still highly demanding as an electrode material for energy storage devices. Biomass-derived carbon materials are best candidates due to their low cost, relatively high abundance, pollution-free nature. Here, we are reporting a facile two-step green approach to convert Himalayan horse chestnuts (HHCNs) into activated carbon materials. In first step, grinding and pyrolysis of the HHCNs were carried out, and then activation was performed using KOH to enhance the pore density and surface area. HHCNs-derived carbon was utilized as an electrode in electrical double-layer capacitors (EDLCs) with 1 M H2SO4 as an electrolyte. The macroporous structure along with hierarchical porous network acts as an efficient source of transportation of charges across the electrode and separator. Cyclic voltammetry test was taken from 10 to 100 mV/s current and within a range of 0–1 V applied potential; approximately rectangular CV shown mirror response towards current and shown typical EDLCs properties. The proximate analysis confirms the presence of heteroatoms like sulfur, oxygen, and nitrogen which act as carbon dopants. The wettability of HHCNs-derived carbon enhanced due to the various types of oxygen functionalities inherited from the lignin skeletal part. The nitrogen content is primarily responsible for the pseudo-capacitive behavior of HHCNs-codoped carbon. HHCNs-derived activated carbon materials has emerged as a promising electrode material for energy storage applications.
        4,000원
        406.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        A thermochemical conversion method known as hydrothermal carbonization (HTC) is appealing, because it may convert wet biomass directly into energy and chemicals without the need for pre-drying. The hydrochar solid product’s capacity to prepare precursors of activated carbon has attracted attention. HTC has been utilized to solve practical issues and produce desired carbonaceous products on a variety of generated wastes, including municipal solid waste, algae, and sludge in addition to the typically lignocellulose biomass used as sustainable feedstock. This study aims to assess the in-depth description of hydrothermal carbonization, highlighting the most recent findings with regard to the technological mechanisms and practical advantages. The process parameters, which include temperature, water content, pH, and retention time, determine the characteristics of the final products. The right setting of parameters is crucial, since it significantly affects the characteristics of hydrothermal products and opens up a range of opportunities for their use in multiple sectors. Findings reveal that the type of precursor, retention time, and temperature at which the reaction is processed were discovered to be the main determinants of the HTC process. Lower solid products are produced at higher temperatures; the carbon concentration rises, while the hydrogen and oxygen content declines. Current knowledge gaps, fresh views, and associated recommendations were offered to fully use the HTC technique's enormous potential and to provide hydrochar with additional useful applications in the future.
        6,300원
        407.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Abstract Purpose : This study sought to identify ways to develop the Korean optometrists to meet the diverse and growing social demand for eye health services. Methods : We analyzed the optometrist qualification system, scope of practice, educational qualifications, and types of qualifications in 38 OECD countries based on the World Health Organization (WHO) and the European Union (EU) national occupational classifications of health care professions, data from World Council of Optometry (WCO) member countries, International Orthoptics Association (IOA), and databases of laws and occupational regulations in each country. Results : The occupational classification of the WHO and EU was classified into optometrists and dispensing opticians systems at the same level as medical personnel. However, the occupational classification in Korea is operating in a lower and monotonous structure. More than 78% of OECD countries operated optometrists system, and more than 67% of optometrists performed Category 3 or higher tasks, including prevention and management of abnormal visual function and primary screening and diagnosis of eye health. The educational level of optometrists was found to have a bachelor's degree or higher education than a bachelor's degree in more than 72% of countries. In addition, major overseas countries appeared to be developing into a system of subdivided qualification types such as orthoptist, advanced optometrist, therapeutic optometrist, independent prescribing optometrist, and ophthalmic medical technicians based on the optometrists system, essential clinical experience, and additional specialized education. Conclusion : The Korean optometrists system should introduce the international level as a national qualification, expand the scope of work to Category 3, and develop more specialized and subdivided qualifications. In conclusion, Korean optometrists need to have a standardized curriculum based on international standards, a bachelor's degree or higher, and certification with required clinical experience. Key words : Korean optometrist, Optometrist, Vision care Authors
        4,200원
        408.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        농촌진흥청 국립원예특작과학원에서는 2021년 분홍색계 소 형 호접란 ‘Arihong’을 육성하였다. 2014년 밝은 분홍색 소형 품종 Phalaenopsis ‘Wedding’와 백색 바탕에 분홍빛을 가지는 소형종 P. ‘[{KT1398-1×(KM-6)-4}×Chiangbeauty-88]-23’ 를 모본과 부본으로 교배하였다. 2018년 실생 120개체 중 잎자세, 화색, 화형, 꽃대수 등 특성이 우수한 ‘14104-1’ 개체를 선발하여 기내 화경배양을 통해 증식하였다. 2018년부터 2021년에까지 1차, 2차특성검정을 통해 품종의 안정성과 균일성을 확인한 후 ‘Arihong’로 명명하였다. 이 품종은 백색(WG155B) 바탕에 중앙 에는 보라빛 분홍색(PVG80B)을 띄며, 진한 자주색(PG78A) 순판 을 가지는 것이 특징이다. 꽃대가 2대씩 발생하고 꽃대 길이는 평균 42.1cm 소형 분화로 적절한 크기를 가지고 있다. 평피기 형태의 꽃은 길이와 폭이 각각 5.1, 5.7cm이며, 분지가 발생하여 1개의 꽃대에 13.0개의 소화가 착생한다. ‘Arihong’의 잎은 수평으로 자라며 길이와 폭이 각각 13.0cm, 4.9cm였다. 또한 초세가 우수하고 생육 속도가 빨라 엽수 확보가 용이한 특성을 보였다.
        4,000원
        409.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Myanmar's soil is diverse in terms of climate and topography, including the central dry zone, hilly and upland areas, deltas, and coastal zones. As a result, crops such as rice, sesame, groundnuts, green gram, and maize are grown as major crops. Some soils are difficult to cultivate due to topographic constraints and permanent forests. Soil fertility was classified according to the physical and chemical characteristics. Based on these data, classification, and a soil survey, a soil map was made by the Land Use Division of Myanmar Agriculture Service. Myanmar's soil was classified into 24 soils according to the WRB classification by FAO/UNESCO, and soil maps were produced at the national level and for each of the 14 states and divisions. This study sought to contribute to efficient land use and sustainable agricultural development in Myanmar by understanding Myanmar's agricultural conditions and soil types.
        4,500원
        410.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Aligned with the recent shift in fruit consumption trends, there is a growing increase in the cultivation of these fruits. Thus, various types of small fruits, including blueberries, have recently been introduced and cultivated in Korea. According to the data, there has been a notable uptick in blueberry farming, in stark contrast to the decline in cultivation of black raspberries, black chokeberries, and blackcurrants. New varieties of blueberries continue to be introduced and cultivated, aligning with the recent consumption trends and are expected to be consistently cultivated in the future. Despite the decrease in the other berries, health benefits associated with all berries have ignited growing consumer interest, resulting in domestic and international market expansion. In conclusion, this research underscores the importance of identifying plant varieties that are well-suited to Korea's climatic conditions, validating efficient cultivation strategies, and establishing robust distribution networks to foster sustainable development in the berry industry.
        4,000원
        411.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study was conducted to determine the acceptability of locally accepted japonica rice varieties among 53 farmers in Bohol and 38 farmers in Nueva Ecija, who were further classified into adopters and non-adopters of the GUVA japonica rice variety. Snowball sampling was made on farmer adopters/cooperators of a high-quality seed multiplication and dissemination project in the said provinces. The farmer respondents were mostly male whose ages ranged from 30 to 80 years and with farm sizes from 0.5 to 16 hectares. The farmers’ rice variety and usage were assessed by comparing the GUVA japonica rice variety with their commonly planted indica rice variety based on its agronomic characteristics, yield and income potential, and seed purity concerns. The barriers/hesitations to adoption of the GUVA japonica rice variety, namely seed availability, varietal information, and market potential, must be complemented with the suggested improvements on the variety together with factors that convince the farmers for committed use of this variety. Researchers together with partner agencies must put a lot of thought on how to integrate and synchronize these concerns so that the farmers can adopt GUVA japonica rice. Interest check on the usage of GUVA japonica rice variety in rice production as well as suggested improvements were solicited as the basis for continuous R&D pursuits that would eventually promote and adopt the GUVA japonica rice variety from these provinces.
        4,200원
        412.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Background: This study helps to evaluate the Ovarian potential of Cameroonian Zebu cattle (Bos indicus) slaughtered in Etoudi – Yaoundé for implementing Assisted Reproductive Techniques (ARTs). The aim was to enhance the productivity of the cattle sub-sector in Cameroon while conserving local genetic resources. Methods: A total of 144 cows, including 94 cycled cows and 50 pregnant cows, were included in the study. Live weights were determined by measuring the thoracic perimeter of each cow using a Rondo measuring tape. Age was determined postmortem through examination of dentition and horns, while the uterus and ovaries were removed, weighed, and classified based on physiological status (pregnant or nonpregnant). Follicles were counted, and their diameters were measured and categorized into small (Ø < 3 mm), medium (Ø 3-8 mm), and large (Ø > 8 mm). Results: The results revealed an average follicular population of 32.02 ± 9.31 per cow, with 22.43 ± 8.45 small follicles, 8.42 ± 3.87 medium follicles, and 0.76 ± 0.34 large follicles. The weight of the right ovary was significantly higher than that of the left ovary (p < 0.05), and cows aged 6 to 9 years exhibited a higher number of follicles compared to other age groups. Cows with medium (BCS = 3) and large (BCS = 4-5) body reserves had the heaviest ovaries. Additionally, pregnant cows had heavier uteri compared to non-pregnant cows, and cows with a body condition score of 3 or higher had higher uterine weights than lean cows (BCS = 1-2). Conclusions: This study demonstrates that age, body condition score, and pregnancy status influence ovarian weight. Body Condition Score serves as a reliable indicator of cow nutritional status, and cows with BCS of 3-5 are excellent candidates for in vitro production of embryos.
        4,200원
        413.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Background: Reproductive management practices play crucial roles to maximize the reproductive performance of cows, and thus contribute to farm profitability. We aimed to assess the reproductive management of cows currently practiced in the dairy farms in an urban farming system. Methods: A total of 62 dairy farms were randomly selected considering all size of farms such as small (1-5 cattle), medium (6-20 cattle) and large farms (> 20 cattle) from selected areas of Dhaka city in Bangladesh. The reproductive managementrelated parameters viz. estrus detection, breeding method, pregnancy diagnosis, dry cow and parturition management, vaccination and treatment of reproductive problems etc. were obtained in a pre-defined questionnaire during the farm visit. Results: The visual observation method was only used (100.0%; 62/62) for estrus detection irrespective of size of the farms; while farmers observed cows for estrus 4-5 times a day, but only for 20-60 seconds each time. Regardless of farm size, 89.0% (55/62) farms used artificial insemination (AI) for breeding the cows. Intriguingly, all farms (100.0%) routinely checked the cows for pregnancy at 35-40 days post-breeding using rectal palpation technique by registered veterinarian. However, only 6.5% (4/62) farms practiced dry cow management. Notably, all farms (100.0%) provided nutritional supplements (Vit D, Ca and P) during late gestation. However, proper hygiene and cleanliness during parturition was not practiced in 77.4% (48/62) farms; even though 96.7% (60/62) farms treated cows by registered veterinarian for parturition-related problems. Conclusions: While farmers used AI service for breeding and timely check their cows for pregnancy; however, they need to increase observation time (30 minutes/ observation, twice in a day: early morning and early night) for estrus detection, consider dry cow management and ensure hygienic parturition for maximizing production.
        4,000원
        414.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        PURPOSES : This study aims to conduct a laboratory evaluation on the use of ferronickel slag for manufacturing Hot Mix Asphalat mixtures. METHODS : This research was based on laboratory evaluation only, where conventional aggregate and FNS at a ratio of 7:3 were used in HMA and the volumetric properties, physical and mechanical properties, and long-term performance of FNS in asphalt mixture were evaluated. RESULTS : The overall results showed that FNS can be applied as aggregate in a hot mix asphalt since volumetric, physical and mechanical properties and long-term performance of HMA mixture with ferronickel slags as aggregate met the required standards according to Korean standards for Asphalt Concrete. CONCLUSIONS : The tensile strength ratio results of HMA mixtures with ferronickel aggregate did not meet the required standards, yet the addition of anti-stripping agent and waste glass fibers to the HMA mixture with ferronickel slags improved the tensile strength results to meet the standards. Additionally, compared to the HMA mixture of the same aggregate gradation but with only natural aggregate, HMA mixture with ferronickel slags had almost the same results for the majority of tests conducted.
        4,000원
        415.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        이 글은 내가 최근에 종이 위에 작업한 작품들의 개요를 보여주는 데 목적이 있다. 이를 통해 작품들에서의 터치, 시간, 운동의 모든 측면과, 제작 과정과 관람 경험에 대한 발견을 전반적으로 제공하고자 한다. 나는 2022년의 대형 드로잉 작업 <목욕하는 사람들 I>과 2023년의 새로운 디지털 비디오 <그림자 속의 어떤 빛>에서 번역과 변환에 집중하고 있는 데, 손으로 들고 촬영하는 방식으로 터치, 시간, 운동의 요소들이 아이폰 카메라에 어떻게 반영되는지를 보여주기 위해서다. 이때 다양한 해상도와 프레임 속도의 사용은 후반 작업에 서 영상의 속도를 늦추는 방식과 결합하여 새로운 등가물을 만들어 내게 된다. 나는 갤러리 에서의 관람객들의 실시간 시청 경험을 고려하고 탐색하기 위해 스튜디오에서의 활동 결과 를 병렬하고 기록하는 촬영 관행도 개발하였다. 이는 특히 커다란 포맷의 네거티브 이미지 아날로그 사진들을 이용하여 손으로 만든 작품을 치환하는 것을 탐구한 나의 초기 실습을 통해서 맥락화된 결과이다. 나는 또한 이 글에서 19세기 후반의 사진, 광학, 회화의 발전, 특히 조르주 쇠라의 점묘법 작품과 나의 현재 작업 사이의 연관성에 대해 논의했다.
        4,800원
        416.
        2023.12 구독 인증기관 무료, 개인회원 유료
        Truck no-show behavior has posed significant disruptions to the planning and execution of port operations. By delving into the key factors that contribute to truck appointment no-shows and proactively predicting such behavior, it becomes possible to make preemptive adjustments to port operation plans, thereby enhancing overall operational efficiency. Considering the data imbalance and the impact of accuracy for each decision tree on the performance of the random forest model, a model based on the Borderline Synthetic Minority Over-Sampling Technique and Weighted Random Forest (BSMOTE-WRF) is proposed to predict truck appointment no-shows and explore the relationship between truck appointment no-shows and factors such as weather conditions, appointment time slot, the number of truck appointments, and traffic conditions. In order to illustrate the effectiveness of the proposed model, the experiments were conducted with the available dataset from the Tianjin Port Second Container Terminal. It is demonstrated that the prediction accuracy of BSMOTE-WRF model is improved by 4%-5% compared with logistic regression, random forest, and support vector machines. Importance ranking of factors affecting truck no-show indicate that (1) The number of truck appointments during specific time slots have the highest impact on truck no-show behavior, and the congestion coefficient has the secondhighest impact on truck no-show behavior and its influence is also significant; (2) Compared to the number of truck appointments and congestion coefficient, the impact of severe weather on truck no-show behavior is relatively low, but it still has some influence; (3) Although the impact of appointment time slots is lower than other influencing factors, the influence of specific time slots on truck no-show behavior should not be overlooked. The BSMOTE-WRF model effectively analyzes the influencing factors and predicts truck no-show behavior in appointment-based systems.
        4,800원
        417.
        2023.12 구독 인증기관 무료, 개인회원 유료
        Port operational efficiency is considered as one of the most important competitive factors and plays a critical role in the port development all over the world, especially container ports. Haiphong Port, which is in the northern of Vietnam, is planned to become one of the national and regional ports. To do this objective, it is important to analyse the operational efficiency of its container terminals. The paper aims to comparatively analyse the operational efficiency of 16 container terminals in Haiphong Port from 2016 to 2022 by basic and Malmquist DEA models. With 112 observations collected and calculated in R software, DEA models have five inputs (container yard area, number of quay crane, berth draft, berth length, labour force) and one output (annual cargo throughput). Consequently, Hai An, Tan Vu, and Vip Greenport are more efficient terminals over the 7-year period, whereas Transvina and MIPEC have lower efficiency. Paper contributions are the literature review about port operational efficiency and references to propose resolutions in next author’s research as well as masterplans to develop Vietnam seaport’s system. Besides, the limitations are discussed as the number of observations and environmental factors in ports.
        4,300원
        418.
        2023.12 구독 인증기관 무료, 개인회원 유료
        This paper attempts to show that the word sì 巳(祀) used after the negative wù 勿 or wú 毋 functions as a “Vintransitive” (all the abbreviations and references used in this paper are given at the end of Part I). As such, it forms a VP, 勿/毋V1V2, where V2 is always one of the six “Type-A ritual Vs”—one being dăo 禱 ‘to pray’, the rest given in the paper. The semantic relationship between V1 (巳/祀) and V2 is closely examined. There are also inscriptions in which V1 is used before yú 于, a “multidirectional” preposition. This is labelled as “Nloc in the sense of ‘in, at’ (not ‘to, for’)” in the construction given in the title. The paper accounts for its motive principle. The paper argues that 巳/祀 is a Vaction meaning “conduct sì-providential ritual”. It was done at a place to seek divine direction and guidance from the deity or Power believed to have dwelt in situ. Originally presented in Takashima (2009a), this paper delves further into linguistic, philological, and cultural aspects of the 巳-ritual couched in the VP, 勿/毋V1(=巳/祀)V2. A major reason for its use is to contrast the 巳-ritual with other rituals and sacrifices. The details will be explained with examples. Part I covers “Examination I: Zhū Shēngyù’s Questions and Zhāng Yùjīn’s Interpretation”. The paper answers the former and evaluates the latter. Part II begins with “Examination II: Qiú Xīguī’s Interpretation” and ends with the conclusions of the entire paper.
        8,600원
        419.
        2023.11 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Since Russia-Ukraine war, India and the United States has enhanced their cooperation as evidenced by the recent engagements. Multiple meetings by officials and leaders including two Quad and 2+2 dialogue summits, have provided a clear stance on each country’s perspective on the recent conflict. The US-India dispute regarding Russia-Ukraine war demonstrates that it is a stress test for the US-India ties, as well as a test of the US leadership in the global politics. The balancing act required to settle the differences between the two countries will have implications for the Indo-Pacific region as well as global security, even though the disagreements are not yet mutually incompatible. Strengthening ties with the US is now a tightrope walk for India. While there are differences between the two countries in Ukraine, the real challenge is turning these differences into opportunities. The paper deals with the different issues arising from the Russia and Ukraine conflict in the context of US-India interface.
        4,300원
        420.
        2023.11 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The Syrian crisis has been persisting for more than eleven years, but shows no signs of resolution or end yet. Various reports from the United Nations and other reputable organizations have extensively documented a multitude of atrocities perpetrated by all factions involved in the conflict. This article examines the Syrian crisis from a perspective of international law. The author analyses the legal justifications put forward by the parties involved in the conflict, including humanitarian intervention, the responsibility to protect, etc. This research paper employs an analytical and descriptive research methodology. The finding concludes that the Syrian Civil War is not likely to be over for the foreseeable future in spite of many efforts under international law. The author also finds that there have been numerous violations of international law by both sides in the conflict related to human rights and humanitarian protection.
        4,300원