• 폴리머
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• 제35권3호
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• pp.254-259
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• 2011

고분자 용액의 전기분무에서 금속 샘플 포집기들은 분무된 입자로부터 흔히 용매를 충분히 제거하거나 재분산이 가능한 분무 입자를 회수하는데 효과적이지 못하다. 단백질 약물의 캡슐화(encapsulation)를 위해 본 연구에서는 입자를 분산매(응고액제)의 층류 안으로 분무하는 새로운 전기분무시스템을 설계하였다. 캡슐화용 물질로 키토산과 폴리아크릴산이 사용되었다. 이 새로운 시스템을 사용하여 입자의 응집을 방지할 수 있었으며, 4~16 kV의 전압과 같은 유속에서 unimodal한 입도분포를 관찰할 수 있었다. 반면에 가한 전압이 평균 입자 크기에 미치는 영향은 크지 않았다.

• Parasites, Hosts and Diseases
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• 제54권5호
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• pp.605-616
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• 2016

In the present study, quids from La Cueva de los Muertos Chiquitos (CMC) were subjected to ELISA tests for 2 protozoan parasites, Toxoplasma gondii (n=45) and Trypanosoma cruzi (n=43). The people who occupied CMC, the Loma San Gabriel, lived throughout much of present-day Durango and Zacatecas in Mexico. The known pathoecology of these people puts them into at-risk categories for the transmission of T. gondii and T. cruzi. Human antibodies created in response to these 2 parasites can be detected in modern saliva using ELISA kits intended for use with human serum. For these reasons, quids were reconstituted and subjected to ELISA testing. All test wells yielded negative results. These results could be a factor of improper methods because there is no precedence for this work in the existing literature. The results could equally be a simple matter of parasite absence among those people who occupied CMC. A final consideration is the taphonomy of human antibodies and whether or not ELISA is a sufficient method for recovering antibodies from archaeological contexts. An additional ELISA test targeting secretory IgA (sIgA) was conducted to further examine the failure to detect parasite-induced antibodies from quids. Herein, the methods used for quid preparation and ELISA procedures are described so that they can be further developed by future researchers. The results are discussed in light of the potential future of quid analysis.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.46-51
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• 2006

In order to utilize the refrigerants condensation heat of condenser on the absorption chiller system, the solution cooling condenser(SCC) were proposed, which weak solution of absorber outlet use as a cooling water. As the UA of the solution cooling condenser increased, increasement of COP is about maximum 0.09 in occasion of single effect and is about maximum 0.08 in occasion of double effect series flow. In the case of heat exchanger efficiency is about 0.85, it's increments are 0.08 and 0.072, each. And solution cooling condenser is a more effective device in the single effect absorption system more than double effect system for the principle of operation. In order to increases the heat of solution cooling condenser, if reduce the flow rate of cooling water or the value of UA, it makes COP increase a little, but it brought COP decrease because of increasing the pressure of system.

• 대한방사성의약품학회지
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• 제5권1호
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• pp.3-10
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• 2019

The activities per volume of $^{188}Re$ and $^{99m}Tc$ from their generators are dependent on the specific activity of their mother nuclides $^{188}W$ and $^{99}Mo$ respectively. After a particular lapse of time, the eluted RI activity is exponentially reduced and thus cannot satisfy the needs of clinical application. The purpose of this study is to develop a $^{188}Re$ and $^{99m}Tc$ concentration device with a compact size that can extend the period of use as well as conveniently concentrate the RI. We designed the concentration module by including two-different check valves that do not required any manual on-off operations. In these concentration process, cation exchange resin embedded with Ag and anion exchange resins were used. After completing the concentrating step, the recovering yield was identified to be more than 93% for $^{188}Re$ generators and 88% for $^{99m}Tc$ generators. Moreover, all these procedures were done within 5 min.

• 상하수도학회지
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• 제34권6호
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• pp.403-410
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• 2020

The difficulty of securing freshwater sources is increasing with global climate change. On the other hand, seawater is less affected by climate change and regarded as a stable water source. For utilizing seawater as freshwater, seawater desalination technologies should be employed to reduce the concentration of salts. However, current desalination technologies might accelerate climate change and create problems for the ecosystem. The desalination technologies consume higher energy than conventional water treatment technologies, increase carbon footprint with high electricity use, and discharge high salinity of concentrate to the ocean. Thus, it is critical to developing green desalination technologies for sustainable desalination in the era of climate change. The energy consumption of desalination can be lowered by minimizing pump irreversibility, reducing feed salinity, and harvesting osmotic energy. Also, the carbon footprint can be reduced by employing renewable energy sources to the desalination system. Furthermore, the volume of concentrate discharge can be minimized by recovering valuable minerals from high-salinity concentrate. The future green seawater desalination can be achieved by the advancement of desalination technologies, the employment of renewable energy, and the utilization of concentrate.

• 한국지하수토양환경학회지:지하수토양환경
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• 제27권2호
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• pp.41-49
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• 2022

To abate the environmental burdens arising from CO₂ emissions, biochar offers a strategic means to sequester carbons due to its recalcitrant nature. Also, biochar has a great potential for the use as carbon-based adsorbent because it is a porous material. As such, developing the surface properties of biochar increases a chance to produce biochar with great adsorption performance. Given that biochar is a byproduct in biomass pyrolysis, characteristics of biochar are contingent on pyrolysis operating parameters. In this respect, this work focused on the investigation of surface properties of biochar by controlling temperature and reaction medium in pyrolysis of pine sawdust as case study. In particular, CO₂ was used as reaction medium in pyrolysis process. According to pyrolytic temperature, the surface properties of biochar were indeed developed by CO₂. The biochar engineered by CO₂ showed the improved capability on CO₂ sorption. In addition, CO₂ has an effect on energy recovery by enhancing syngas production. Thus, this study offers the functionality of CO₂ for converting biomass into engineered biochar as carbon-based adsorbent for CO₂ sorption while recovering energy as syngas.

• 한국학교ㆍ지역보건교육학회지
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• 제23권4호
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• pp.63-79
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• 2022

Objectives: The purpose of this study is to reveal the phenomenological meaning and experience of alcohol craving experienced by alcoholics through qualitative research. Methods: From November 8, 2020 to October 10, 2022, in-depth interviews were conducted with four recovering alcoholics within two years of a single week who were diagnosed with alcoholism in the past and had been hospitalized for alcoholism problems. The data were analyzed using phenomenological qualitative research methods. Results: The alcohol craving experienced by alcoholics worked in connection with the life of alcoholics. Alcohol intensity was not entirely determined by external factors, but varied by the individual's internal state and circumstances surrounding the individual, and cravings were found to be classified into when control and intervention were possible. Also, the power to neutralize alcohol cravings was a warm 'self-compassion' mind. Conclusion: This study presented a new perspective on alcohol craving, and based on this perspective, the necessity of developing an alcohol addiction prevention program and a recurrence prevention program was presented. In addition, the basis for emphasizing the necessity of complete abstinence in health education services for preventing alcohol and preventing recurrence in the community was presented.

• Nuclear Engineering and Technology
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• 제55권7호
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• pp.2432-2437
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• 2023

Methodology for suppressing or recovering the distorted spectra, which may occur due to mutual non-uniformity and nonlinear response when a multi-detector is simultaneously operated for gamma spectroscopy, is presented with respect to its applicability to stabilization of spectra having the non-identical feature using modified full spectrum reallocation method. The modified full-spectrum reallocation method is extended to provide multiple coefficients that describe the gain drift for multi-division of the spectrum and they were incorporated into an optimization process utilizing a random sampling algorithm. Significant performance improvements were observed with the use of multiple coefficients for solving partial peak dislocation. In this study, our achievements to confirm the stabilization of spectrum having differences in moments and modify the full spectrum reallocation method provide the feasibility of the method and ways to minimize the implication of the non-linear responses normally associated with inherent characteristics of the detector system. We believe that this study will not only simplify the calibration process by using an identical response curve but will also contribute to simplifying data pre-processing for various studies as all spectra can be stabilized with identical channel widths and numbers.

• 한국인터넷방송통신학회논문지
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• 제23권6호
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• pp.21-26
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• 2023

최근 디지털 자산으로 불리는 이더리움, 비트코인 등의 암호화폐가 자산으로 빠르게 인식되고 있다. 암호화폐는 실물자산과는 전혀다른 특성을 가지고 있어 신중하고 안전하게 다루어야 하지만 디지털 자산의 단점은 지갑의 개인 키를 아는 사람이라면 누구나 쉽게 해당 디지털 자산을 탈취할 수 있다. 시드카드를 분실하거나 도난 당한경우 또는 작성시 노출된 경우 다른사람이 습득한 시드카드를 이용하여 개인키를 복구하여 지갑을 사용 할 수 있기 때문에 보안에 매우 취약하다. 본 논문에서는 시드카드 작성에 필요한 니모닉 단어 제공시 QR코드를 이용하여 시드카드의 노툴 및 분실, 도난에 대해 안전하게 작성하는 방식을 제안하므로 암호화된 자산을 안전하게 보호하고자 한다.

• 재활간호학회지
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• 제13권1호
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• pp.23-31
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• 2010

Purpose: The purpose of this study were to describe the level of activities of daily living (ADLs) and fatigue of stroke patients and to identify related factors of ADLs and fatigue. Method: A sample of 132 were used who were recovering from stroke. The face-to-face interviews were conducted to collect data. The levels of ADLs and fatigue were evaluated using the Modified Barthel Index and Kim's fatigue scale respectively. A series of t-test and analysis of variance analyses were conducted to examine study purposes using SPSS 15.0. Results: The levels of fatigue and ADLs were 65.6 (SD=16.52) and 74.6 (SD=22.32) respectively. Significantly poorer ADLs were found: women (t=2.05, p=.001), older people aged ${\geq}$ 70 years (F=2.74, p=.046), the duration of onset (F=4.34, p=.006), the use of assist devices (F=35.64, p<.001), the parts of paralysis (F=4.25, p=.007), the time to attack (F=3.34, p=.039), and accompanying symptoms (F=15.23, p<.001). There was a significant difference in fatigue with patients with lower accompanying symptoms having lower fatigue (F=11.08, p<.001). Conclusion: These findings suggest gender, the duration from onset, the use of assist device, the parts of paralysis, the time to attack and accompanying symptoms were significant factors of the ADLs and fatigue post stroke. These factors should be considered when developing and testing nursing intervention programs for stroke survivors.