Purpose: This study aims to explore the in-depth experiences of participating in a parent education program at the H Science Institute and understand the meaning and essence of their experiences. Methods: This study employed qualitative content analysis. Data were collected from June 20 to 30, 2023. Participants were a total of 28 people who could provide detailed experiences of participation in the parent education program at the H Science Institute. Focus-group interviews were conducted with 28 participants. Results: The qualitative content analysis revealed six themes: “Exploring the genuine path to become a parent”, “Precious experiences acquired through education that is not easily accessible”, “Discovering the transformed self through education”, “I believe that there had been a change in family relationships”, “Improvements are required in a few contents”, and “I look forward to the program with more extended outreach”. Conclusion: Efforts are required to understand the current status of parent education, verify its empirical effectiveness, and provide parents with awareness of the necessity to observe and control their minds.

UAM 등 신교통수단의 등장으로 인해 고속도로는 경쟁력 제고가 필요한 실정이다. 해외 국가에서는 고속도로의 제한속도를 상향하 고 있으며 국내에서도 고속도로 경쟁력 확보를 위한 방안으로 초고속도로 도입을 고려하고 있다. 따라서 본 연구에서는 초고속도로 도입에 따른 사회적 편익을 분석하고자 하였다. 분석을 위해 교통수요분석 프로그램 TransCAD를 활용하였으며 속도 상향 시나리오별 (140km/h ~ 200km/h) 편익을 도출하였다. 그 결과, 전국 고속도로의 속도를 상향할 때 전국 도로 네트워크의 총편익이 증가하는 것으 로 나타났다. 본 연구는 향후 초고속도로 도입을 위한 정책 기초 자료로 활용할 수 있을 것으로 기대된다.

At Pyropia farms, organic acid treatments have enhanced productivity and quality by removing pest algae (such as Ulva spp. and diatoms) and reducing the occurrence of diseases. Ulva spp. attaches to the Pyropia nets competing for inorganic nutrients & space and diminishing productivity. Additionally, the presence of attached contaminants (such as diatoms and middy particles) on the Pyropia nets negatively affects the quality of Pyropia. This study investigated the effects of removing Ulva linza and washing the Pyropia yezoensis nets using an activating treatment agent (organic acid and highly saline solution) with an air bubble device. The results of measuring the dead cell ratios after treatment under different conditions showed that the dead cell ratio of U. linza did not significantly increase when the air bubble device combined the activating treatment agent with the activating treatment agent alone. When washing the P. yezoensis nets, the air bubble device was about 19-37% more effective than the activating treatment agent alone. The findings of this study suggest that the air bubble device enhances the efficacy of the activating treatment agent, resulting in the effective cleaning of the Pyropia nets.

The theoretical capacity of silicon-based anode materials is more than 10 times higher than the capacity of graphite, so silicon can be used as an alternative to graphite anode materials. However, silicon has a much higher contraction and expansion rate due to lithiation of the anode material during the charge and discharge processes, compared to graphite anode materials, resulting in the pulverization of silicon particles during repeated charge and discharge. To compensate for the above issues, there is a growing interest in SiOx materials with a silica or carbon coating to minimize the expansion of the silicon. In this study, spherical silica (SiO2) was synthesized using TEOS as a starting material for the fabrication of such SiOx through heating in a reduction atmosphere. SiOx powder was produced by adding PVA as a carbon source and inducing the reduction of silica by the carbothermal reduction method. The ratio of TEOS to distilled water, the stirring time, and the amount of PVA added were adjusted to induce size and morphology, resulting in uniform nanosized spherical silica particles. For the reduction of the spherical monodisperse silica particles, a nitrogen gas atmosphere mixed with 5 % hydrogen was applied, and oxygen atoms in the silica were selectively removed by the carbothermal reduction method. The produced SiOx powder was characterized by FE-SEM to examine the morphology and size changes of the particles, and XPS and FT-IR were used to examine the x value (O/Si ratio) of the synthesized SiOx.

Highly safe lithium-ion batteries (LIBs) are required for large-scale applications such as electrical vehicles and energy storage systems. A highly stable cathode is essential for the development of safe LIBs. LiFePO4 is one of the most stable cathodes because of its stable structure and strong bonding between P and O. However, it has a lower energy density than lithium transition metal oxides. To investigate the high energy density of phosphate materials, vanadium phosphates were investigated. Vanadium enables multiple redox reactions as well as high redox potentials. LiVPO4O has two redox reactions (V5+/V4+/V3+) but low electrochemical activity. In this study, LiVPO4O is doped with fluorine to improve its electrochemical activity and increase its operational redox potential. With increasing fluorine content in LiVPO4O1-xFx, the local vanadium structure changed as the vanadium oxidation state changed. In addition, the operating potential increased with increasing fluorine content. Thus, it was confirmed that fluorine doping leads to a strong inductive effect and high operating voltage, which helps improve the energy density of the cathode materials.

본 연구에서는 토지매수 청구 제도에 의한 국립공원 내 사유지 매수 현황을 분석하여, 토지매수 청구 제도의 유용성과 한계, 정책 시사점을 도출하였다. 토지매수 청구 제도가 도입된 2006년부터 2021년까지 국가가 매수한 사유지 데이터를 활용하여, 토지 소유자의 매수 청구 결정에 영향을 미치는 요인들을 로지스틱 회귀분석을 통해 분석하였다. 분석 결과, 사유지의 지목이 임야이고, 사유지 면적 중 공원자연보존지구 면적이 높으며, 공원 경계까지 거리가 멀고, 단위면적당 공시지가가 낮은 사유지가 매수 청구에 의해 매수될 확률이 높았다. 이 결과는 토지 소유자 관점에서 보면 재산권 행사가 어려운 사유지일수록 매수 청구될 확률이 높다는 뜻이고, 공원 관리자의 관점에서 보면 보전 가치가 높은 사유지가 매수 청구될 확률이 높다는 의미이다. 즉, 토지매수 청구 제도를 활용하여 사유지 매수를 진행해도 보전 가치가 높은 토지를 매수할 수 있어, 높은 자연환경 보전 효과를 기대할 수 있다. 로지스틱 회귀모형은 또한 북한산국립 공원 내 사유지 중 401㎡의 사유지가 향후 매수 청구될 확률이 높을 것으로 예측하였다. 토지매수 청구 제도는 국립공원 내 토지 소유자의 민원 해소에 효과적인 제도임에도 현재 활용도가 매우 낮은데, 본 연구에서는 실증 분석 결과를 바탕으로 제도의 활용도를 높일 수 있는 정책 방안을 제시하였다.

PURPOSES : This study is to initiated to estimate the impact of mixed traffic flow on expressway section according to the market penetration rate(MPR) of automated vehicles(AVs) using a enhanced intelligent driver model(EIDM). METHODS : To this end, microscopic traffic simulation and EIDM were used to implement mixed traffic flow on basic expressway section and simulation network was calibrated to understand the change of impact in mixed traffic flow due to the MPR of AVs. Additionally, MOEs of mobility aspects such as average speed and travel time were extracted and analyzed. RESULTS : The result of the impact of mobility MOEs by MPR and level of service indicated that 100% MPR of AVs normally affect positive impact on expressway at all level of service. However, it was analyzed that improvements in the level of service from LOS A to C are minimal until the MPR of AVs reaches 75% or higher. CONCLUSIONS : This research shows that impact of MPR of AVs using EIDM of mixed traffic flow on basic expressway. Increasing MPR of AVs affects positive impact on expressway at all level of services. However, MPR from 25% to 75% of AVs in LOS A to C shows minimal impacts. Therefore, to maximize the effectiveness of AVs, appropriate traffic operation and management strategies are necessary.

The genus Desmodesmus (Chodat) S.S. An, T. Friedl & E. Hegewald is ubiquitous in freshwater ecosystems, such as rivers, ponds, and wetlands. The actual species diversity and distribution of the genus is unknown because of morphological plasticity affected by habitats. Currently, 38 Desmodesmus species have been reported in Korea most of which transferred from the genus Scenedesmus recently, however, no phylogenetic relationships have been studied yet. Despite the challenges in analyzing relationships among Desmodesmus species through the morphology, ecology, and original description, this study focused on examining species-level relationships using the FBCC culture strains isolated from Korea. A total of 299 sequences (66 of 18S rRNA, 47 of atpB, 67 of petA, 52 of rbcL, and 67 of tufA) were newly determined and used for phylogenetic analysis. Four plastid genes tend to have higher variation than 18S rRNA in the variable sites and P-distance. From the combined phylogeny, the Desmodesmus included six clades such as Clade-1: D. pseudoserratus and D. serratus, Clade-2: D. communis, D. dispar, D. maximus, D. pannonicus, unidentified Desmodesmus sp., Clade-3: D. bicaudatus and D. intermedius, Clade-4: D. microspina, D. multivariablis, D. pleiomorphus, D. subspicatus, Clade-5: D. abundans, D. kissii, and D. spinosus, and Clade-6: D. armatus, D. armatus var. longispina, D. opoliensis, unidentified Desmodesmus spp. The new sequence data from FBCC strains will be used to identify species and study the molecular ecology of scenedesmacean green algae in freshwater ecosystems. The phylogenetic information from this study will expand our understanding of Desmodesmus species diversity in Korea.

In this study, the performances of H2S, NH3, and HCl sensors for real-time monitoring in small emission facilities (4, 5 grades in Korea) were evaluated at high concentration conditions of those gases. And the proper approach for the collection of reliable measurement data by sensors was suggested through finding out the effect on sensor performances according to changes in temperature and humidity (relative humidity, RH) settings. In addition, an assessment on sensor data correction considering the effects produced by environmental settings was conducted. The effects were tested in four different conditions of temperature and humidity. The sensor performances (reproducibility, precision, lower detection limit (LDL), and linearity) were good for all three sensors. The intercept (ADC0) values for all three sensors were good for the changes of temperature and humidity conditions. The variation in the slope value of the NH3 sensor showed the highest value, and this was followed by the HCl, H2S sensors. The results of this study can be helpful for data collection by enabling the more reliable and precise measurements of concentrations measured by sensors.

Passengers on public buses operating in the metropolitan area are exposed to the closed indoor air for minutes to hours. The indoor air quality of buses is mostly controlled through ceiling-mounted ventilation and filtration devices. A simulation study using a commercial code was conducted for fluid flow analysis to evaluate the potential effectiveness of an air purifier that can be inserted into bus windows to supply clean air from the outside to the inside. As a result of field measurements, the average CO2 concentration inside the bus during morning and evening rush hours ranged from 2,106±309 ppm to 3,308 ± 255 ppm depending on the number of passengers on board. This exceeded the Guideline for Public Transportation. The optimal installation position of an air purifier appeared to be the front side of the bus. In fact, even a low diffusing flow velocity of 0.5m/s was effective enough to maintain a low concentration of CO2 throughout the indoor space. Based on numerical analysis predictions with 45 passengers on board, the maximum CO2 concentration in the breathing zone was 2,203 ppm with the operation of an air purifier.

The purpose of this study is to identify the major peacekeeping activities that the Korean armed forces has performed from the past to the present. To do this, we collected 692 press releases from the National Defense Daily over the past 20 years and performed topic modeling and social network analysis. As a result of topic modeling analysis, 112 major keywords and 8 topics were derived, and as a result of examining the Korean armed forces's peacekeeping activities based on the topics, 6 major activities and 2 related matters were identified. The six major activities were 'Northeast Asian defense cooperation', 'multinational force activities', 'civil operations', 'defense diplomacy', 'ceasefire monitoring group', and 'pro-Korean activities', and 'general troop deployment' related to troop deployment in general. Next, social network analysis was performed to examine the relationship between keywords and major keywords related to topic decision, and the keywords ‘overseas’, ‘dispatch’, and ‘high level’ were derived as key words in the network. This study is meaningful in that it first examined the topic of the Korean armed forces's peacekeeping activities over the past 20 years by applying big data techniques based on the National Defense Daily, an unstructured document. In addition, it is expected that the derived topics can be used as a basis for exploring the direction of development of Korea's peacekeeping activities in the future.

우리나라 여러 해양환경 지역으로부터 확보한 370주의 해양세균, 균류, 미세조류로부터 기초생 리활성(항산화, 항염, 항균, 항암, 항바이러스)을 조사하여 채집지, 분리원, 종(種) 수준에서의 활성결과를 비교하였다. 해양세균의 경우, 일반적으로 유용성이 많이 알려진 Streptomyces 속 과 Bacillus 속에 속하는 균주들이 두드러진 강한 효능이 관찰되었고, 주로 해양퇴적물로부터 유용한 자원을 분리할 수 있었다. 해양균류와 미세조류의 경우에도 종 특이적으로 활성이 강 하게 나타나는 결과를 확인할 수 있었고, 효능 특이적으로 활성을 보이는 결과도 얻을 수 있었 다. 이러한 결과를 바탕으로 추후 특정질병에 선택적으로 효능을 보이는 화학물질 연구 또는 자원 기반 연구 수행 시 유용성을 전제로 한 자원 확보 전략 수립과 산업 활성화를 위한 전 략소재로 우선적 접근이 용이할 수 있는 연구결과라 생각된다. 또한, 이들 결과를 해양바이오 뱅크를 통한 분양소재로 활용함으로써 학계, 산업계에서 활용하여 해양바이오산업 활성화에 좀 더 빠른 접근을 도울 수 있다고 생각한다.

This study investigates the integration of astronomy-related topics in the Korean national science curricula spanning from 1945 to 2023. We analyze the placement and extent of astronomy content across different school levels. Astronomy contents in the science curricula have changed in response to social needs (e.g., practical knowledge required for agriculture and fishery) and advancement in astronomical research (e.g., the discovery of exoplanets and the suggestion of new cosmological parameters). Contents addressing the motions of celestial objects and stellar physical properties have remained relatively consistent. In the latest 2022 revised national curriculum, scheduled for implementation in 2024, several elements, such as coordinate systems, have been removed, while the inquiry activities using digital tools are emphasized. The incorporation of the cosmic perspectives in the national curriculum, as well as astronomy education within the context of education for sustainable development, remains limited even in the most recent curriculum. For future life revisions, the active participation of researchers is needed to reflect the latest astronomical research progress and scientific characteristics in the field of astronomy.

본 연구는 대구지방교정청 소재 P교도소에 수용중인 성폭력 이수명령 대상자 24명 중 12명에 대하여 성폭력사범 심리치료프로그램 기본과정을 시행하고 12명은 무처치 통제집단으로 배정하여 그 효과성을 조사하였다. 이를 위해 법무부에서 2022년 새롭 게 개발한 성폭력사범 심리치료 프로그램 효과성 평가집(SOTEST)을 사전과 사후에 실시하여 인지/태도, 자기관리문제, 대인관계, 성적 관심문제 영역에서 개입의 효과가 있는지를 분석하였다. 연구 결과 실험 집단에 있어 심리치료 프로그램 후 유의한 효과 가 나타났으며, 무처치 통제집단과 비교도 통계적으로 유의한 차이가 있었다. 또한, 그 결과를 교차 검증하기 위해 타인 보고식 치료자 평가를 진행했으며 5가지 하위요 인에 대한 수형자의 자기보고 평가와 치료자의 타인보고 평가가 일치하는 결과를 보 였다. 성폭력사범 대상 심리치료 프로그램 후 강간통념, 변화동기 등에는 변화를 나타냈으나, 대인관계, 자기관리, 성적인 집착 등에는 유의한 차이를 나타내지 않았다. 추 후 연구에서 대인관계 등에서 유의한 차이가 나타나지 않은 원인을 탐색하고 성폭력 사범대상 중 집중과정과 심화과정에서도 유사한 양상이 발견되는지 확인할 필요가 있 다. 또한 연구에 참여한 참여자 표본 수의 한계가 있을 수 있으므로 더 많은 자료를 통해 본 연구의 결과가 유지 또는 개선되는지 여부도 중요하다. 본 연구는 기존의 성 폭력관련 척도가 아니라 교정시설에 수용된 성폭력사범을 대상으로 개발 및 타당화된 척도를 통해 그 효과성을 검증하였다. 더불어 치료자의 타인보고 결과의 일치성을 확 인하였다는 연구에 의의가 있다. 몇 가지 제한점을 극복하고 프로그램의 질적 향상을 위해 이 도구의 적합성과 프로그램 내용의 구성에 대해서도 건강한 논의가 지속되어 야 할 것이다.

In this study, the quality of sow pork was compared with commercial pork to evaluate sow pork as raw meat material for processing. Texture, cooking loss, color, pH, water, lipid, fatty acid, volatile profiles, and sensory characteristics of 3 parts (tenderloin, loin, hind leg) of sow and commercial pork were analyzed. In texture analysis, sow pork had significantly higher shear force compared to commercial pork (tenderloin: sow 143.19 N, commercial 107.79 N; loin: sow 173.62 N, commercial 120.65 N; hind leg: sow 211.76 N, commercial 112.80 N) (p<0.05). There were significant differences in cooking loss, color, and pH, but they differed by part. A total of 49 volatile compounds were identified, and there were significant differences in 22 volatile compounds. In the case of hexanal (one of the warmed-over flavors), which was detected on the largest scale, the relative concentration was significantly higher in the tenderloin of commercial pork (p<0.05). On the other hand, no differences were reported by sensory analysis for hardness, off-flavor, juiciness, oiliness, appearance, taste, and acceptability between cooked sow and commercial pork. This study provides a database on the quality of sow pork by parts, which is considerable to develop proceed meat products using sow meat.