The effect of Reformed Nurse Staffing Policy in Korea on Both Nurse and Patient Outcomes: A Systematic Review and Meta-Analysis

Hyunjeong Kwon 한국간호과학회 2023 한국간호과학회 학술대회 Vol.2023 No.11

Effects of the Gap between Appropriate and Actual Nurse Staffing Levels on Nurse Outcomes: Results from a Multicenter Study

Hyunjeong Kwon,Jinhyun Kim 한국간호과학회 2023 한국간호과학회 학술대회 Vol.2023 No.11

Taxonomic Review of the Subfamily Pristocerinae (Hymenoptera: Bethylidae) from Korea

Jongok Lim,Hyunjeong Kwon,Jongwook Lee,Seunghwan Lee 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05

Six species of the Pristocerinae are recognized from Korea, including two new species (Pseudisobrachium sp. nov., Parascleroderma sp. nov.), and four species new to Korea (Acrepyris minutus (Yasumatsu 1955), Apenesia elegans Terayama 1999, A. okinawensis Terayama 1999, and Pristocera formosana Miwa et Sonan 1935). The illustrations of diagnostic characters are presented with a key to species of Korean Pristocerinae is provided.

Three new records of the subfamily Epyrinae Hymenoptera: Bethylidae) from Korea

Jongok LIM,Hyunjeong KWON,Jongwook LEE,Sanghyun KOH,Seunghwan LEE 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.05

Three species, Allobethylus tomoae Terayama, Cephalonomia tarsalis (Ashmead), and Laelius yamatonis Terayama of the subfamily Epyrinae are recorded for the first time in Korea. Both sexes of A. tomoae Terayama, C. tarsalis (Ashmead) and female of L. yamatonis Terayama are briefly described with diagnostic morphological illustrations for each species based on the Korean specimens. Male of the genus Allobethylus is discovered for the first time from the word.

Photo-induced Living Cationic Polymerization of Isobutyl Vinyl Ether in the Presence of Various Combinations of Halides of Diphenyliodonium and Zinc Salts in Methylene Chloride

Kwon Soonhon,Chun Hyunjeong,Mah Soukil The Korean Fiber Society 2004 Fibers and polymers Vol.5 No.4

Living nature of photoinduced cationic polymerization of isobutyl vinyl ether (IBVE) in the presence of various combinations of diphenyliodonium halide (DPIX), a photocationic initiator and zinc halide $(ZnX_2)$ in methylene chloride has been investigated. Attainment of $100\%$ conversion and a linear relationship between $\%$conversion and number average molar mass of the resulting polymer, strongly suggests the living nature of this system. Livingness of the polymerization system was observed irrespective to the type of halide anion of the initiator and zinc salts unless the reaction temperature is not higher than $-30^{\circ}C$. The rate of polymerization decreases in the order of iodide > bromide > chloride when halide salt of DPIX and $ZnX_2$ are used. It is postulated that the cationic initiation is started by the insertion of weakly basic monomer in to the activated C-X terminal of the monomer adduct which is a reaction product of monomer and HX, a photolytic product of DPIX, formed in situ during the photo-irradiation process. It was concluded that polymerization is initiated by the insertion of weakly basic monomer into activated C- X terminal of monomer adduct due to the pulling action of$ZnX_2$, which successively producing a new polarized C-X terminal for the propagation in cationic nature. This led us to a conclusion that the living nature of this cationic polymerization is ascribable to the polarized C-X growing terminal, which is stable enough to depress the processes of chain transfer or termination process.

Verification of the structural relationship among athlete Julsil, self-regulation, and flow in adolescent athletes

( Hyunjeong Kim ),( Sangwook Kang ),( Sungho Kwon ) 국민체육진흥공단 한국스포츠정책과학원 2019 International Journal of Applied Sports Sciences Vol.31 No.1

The purpose of this study was to explore the structural relationship among the perception of athlete Julsil, self-regulation, and flow of adolescent athletes. A total of 425 middle school and high school athletes completed a survey. Structural equation modeling analysis was conducted to verify the research model. The result of verifying the structural relationship among athlete Julsil, self-regulation and flow indicates that self-regulation was found to mediate the relationship between athlete Julsil and flow. In addition, measurement invariance was verified across gender and school that can be applied equally to various groups. Through these results, it was verified that athlete Julsil is an important psychological factor for adolescent athletes. In addition, they need to have a firm mental attitude by themselves and to move them to action for peak performance.

The Association Among Post-hemodialysis Blood Pressure, Nocturnal Hypertension, and Cardiovascular Risk Factors

( Hyunjeong Cho ),( Soon Kil Kwon ),( Seung Woo Lee ),( Yu Mi Yang ),( Hye Young Kim ),( Sun Moon Kim ),( Tae-young Heo ),( Chang Hwan Seong ),( Kyeong Rok Kim ) 대한전해질학회 2023 Electrolytes & Blood Pressure Vol.21 No.2

Background: Most hemodialysis (HD) patients suffer from hypertension and have a heightened cardiovascular risk. While blood pressure (BP) control is essential to end-stage kidney disease (ESKD) patients, overly stringent control can lead to intradialytic hypotension (IDH). This study aimed to examine BP variations during and after HD to determine whether these variations correlate with IDH risk. Methods: BP measurements during dialysis were taken from 28 ESKD patients, and ambulatory BP monitoring was applied post-dialysis. Laboratory parameters and risk factors, including diabetes, coronary disease, and LV mass index, were compared between IDH and non-IDH groups using an independent t-test. Results: Of the 28 patients with an average age of 57.4 years, 16 (57.1%) had diabetes, 5 (17.9%) had coronary artery disease, and 1 (3.6%) had cerebrovascular disease. The mean systolic blood pressure (SBP) during and post-HD was 142.26 mmHg and 156.05mmHg, respectively (p=0.0003). Similarly, the mean diastolic blood pressure (DBP) also demonstrated a significant increase, from 74.59mmHg during HD to 86.82mmHg post-HD (p<0.0001). Patients with IDH exhibited a more substantial SBP difference (delta SBP, 36.38 vs. 15.07 mmHg, p=0.0033; age-adjusted OR=1.58, p=0.0168) and a lower post-dialysis BUN level (12.75 vs. 18.77mg/dL, p=0.0015; age-adjusted OR=0.76, p=0.0242). No significant variations were observed in daytime and nocturnal BP between the IDH and non-IDH groups. Conclusion: Hemodialysis patients exhibited a marked increase in post-dialysis BP and lacked a nocturnal BP dip, suggesting augmented cardiovascular risks. This highlights the importance of more stringent BP control after hemodialysis.

Dermal Toxicity of Flake-Like 관-Alumina Pigments.

Kwon, TaeWoo,Seo, HyunJeong,Jang, Seongwan,Lee, Sang-Geun,Park, Sungkyun,Park, Kang Hyun,Youn, BuHyun American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.2

<P>Aluminum is one of the most widely used nonferrous metals and an important industrial material, especially for automotive coatings. However, potential toxicity caused by aluminum in humans limits the used of this metal. 관-alumina is the most stable form of aluminum in various phases. Although the results of studies evaluating the dermal toxicity of 관-alumina remained unclear, this compound can still be used as a pigment in cosmetics for humans. In the current study, we further evaluated the dermal cytotoxic effects of 관-alumina on human skin cells and an in vivo mouse model. We also measured the in vitro penetration profile of flake-like 관-alumina in porcine skin and assessed the degree of cellular metabolic disorders. Our findings demonstrated that treatment with flake-like 관-alumina did not significantly affect cell viability up to 24 h. This compound was found to have a non-penetration profile based on a Franz modified diffusion cell assay. In addition, flake-like 관-alumina was not found to induce dermal inflammation as assessed by histology of epidermal architecture, hyperplasia, and the expression of Interleukin-1관 and Cyclooxygenase-2. Results of the cellular metabolic disorder assay indicated that flake-like 관-alumina does not exert a direct effect on human skin cells. Taken together, our findings provided not only evidence that flake-like 관-alumina may serve as a pearlescent pigment in cosmetics but also experimental basis utilizing 관-alumina for human application. Our results also obviously provide new insight of the further toxicity study to aluminum based nanoparticles for skin.</P>

현무암 CO2 지중저장 해외 연구 사례 조사 및 타당성 분석

전현정(Hyunjeong Jeon),신형철(Hyung Chul Shin),윤태권(Tae Kwon Yun),한원식(Weon Shik Han),정재훈(Jaehoon Jeong),곽재휘(Jaehwii Gwag) 대한자원환경지질학회 2023 자원환경지질 Vol.56 No.3

CO2 배출량 증가로 인한 지구온난화 심화에 대한 주요 대책으로 CO2를 포집하여 지중에 저장하는 이산화탄소 포집·저장(Carbon capture storage, CCS) 기술이 주목받고 있다. 최근 현무암의 거대한 체적, 높은 반응성, 풍부한 양이온 함량 등의 특성이 CO2 포획 및 저장 기작에 유리하게 작용한다는 사실이 부각되면서, 현무암층을 대상으로 하는 CO2 지중저장이 다양한 분야에서 연구되고 있다. 본 연구에서는 CO2 지중저장 기작, 현무암의 특성과 더불어 국외 연구 사례들을 조사 및 분석하여, 현무암 CO2 지중저장에 대한 타당성을 검토하였다. 조사한 사례들은 수행 방법을 기준으로 실험, 모델링, 현장 실증 연구로 분류하였다. 연구 사례별 실험 조건의 경우 온도는 20 ~ 250 ℃, 압력은 0.1 ~ 30 MPa, 암석-유체 간 반응 시간은 수 시간에서 4년까지 넓은 범위에서 진행되었다. 모델링 연구에서는 현무암 CO2 지중저장 후보지와 유사한 모델을 구축하여 CO2-유체 주입 전∙후 유체역학적 및 지화학적 요인들에 대한 변화를 살펴본 사례가 다수였다. 검토 결과, 현무암은 잠재 CO2 저장용량이 크고, CO2 광물화 반응이 빠르기 때문에 현무암 CO2 지중저장시 온도와 압력 및 지질구조와 같은 환경적인 제약이 적다. 현장 실증 사례인 CarbFix project, Wallula project가 성공적으로 수행되어 실증 수행가능성 또한 높게 평가되고 있다. 그러나 현무암 대상 CO2 지중저장에서 신중히 고려해야 할 점도 존재한다. 광물화 기작이 현무암의 조성, 주입 지역의 특성 등 여러 요인에 따라 결과가 상이하게 나타나고, 탄산염과 규산염 광물 등의 침전으로 인해 관정 주입성(injectivity) 저하가 발생할 수 있다. CO2 주입 시 저장층 내 압력 증가가 발생할 수 있으며 암석-CO2-유체 반응 과정에서 지중환경 오염의 위험성도 존재한다. 유체에 CO2를 용해시켜 주입하기 때문에 기존 방식과 다른 지중 모니터링 기술 또한 요구된다. 따라서, 현무암에서의 CO2 지중저장을 안정적이고 효율적으로 수행하기 위해서는 적합한 대상 지역을 선별하고, 해당 지역에 대한 여러 자료를 구축하여 이를 기반으로 한 다양한 실험, 모델링, 현장 실증 등의 체계적인 연구 수행이 필요하다. Development of Carbon Capture and Storage (CCS) technique is becoming increasingly important as a method to mitigate the strengthening effects of global warming, generated from the unprecedented increase in released anthropogenic CO2. In the recent years, the characteristics of basaltic rocks (i.e., large volume, high reactivity and surplus of cation components) have been recognized to be potentially favorable in facilitation of CCS; based on this, research on utilization of basaltic formations for underground CO2 storage is currently ongoing in various fields. This study investigated the feasibility of underground storage of CO2 in basalt, based on the examination of the CO2 storage mechanisms in subsurface, assessment of basalt characteristics, and review of the global research on basaltic CO2 storage. The global research examined were classified into experimental/modeling/field demonstration, based on the methods utilized. Experimental conditions used in research demonstrated temperatures ranging from 20 to 250 ℃, pressure ranging from 0.1 to 30 MPa, and the rock-fluid reaction time ranging from several hours to four years. Modeling research on basalt involved construction of models similar to the potential storage sites, with examination of changes in fluid dynamics and geochemical factors before and after CO2-fluid injection. The investigation demonstrated that basalt has large potential for CO2 storage, along with capacity for rapid mineralization reactions; these factors lessens the environmental constraints (i.e., temperature, pressure, and geological structures) generally required for CO2 storage. The success of major field demonstration projects, the CarbFix project and the Wallula project, indicate that basalt is promising geological formation to facilitate CCS. However, usage of basalt as storage formation requires additional conditions which must be carefully considered – mineralization mechanism can vary significantly depending on factors such as the basalt composition and injection zone properties: for instance, precipitation of carbonate and silicate minerals can reduce the injectivity into the formation. In addition, there is a risk of polluting the subsurface environment due to the combination of pressure increase and induced rock-CO2-fluid reactions upon injection. As dissolution of CO2 into fluids is required prior to injection, monitoring techniques different from conventional methods are needed. Hence, in order to facilitate efficient and stable underground storage of CO2 in basalt, it is necessary to select a suitable storage formation, accumulate various database of the field, and conduct systematic research utilizing experiments/modeling/field studies to develop comprehensive understanding of the potential storage site.

청소년의 행복감과 관련 변인들의 구조적 관계 분석: 비행경험 여부에 따른 집단 간 비교

권용준(Kwon, Yongjun),윤현정(Yun, Hyunjeong) 한국청소년정책연구원 2020 한국청소년연구 Vol.31 No.1

본 연구는 청소년이 지각한 행복감 관련 변인들로 부모관계, 또래관계, 교사관계, 그릿과 정서문제의 구조적 관계는 어떠한지 검증하고자 하였다. 또한 청소년의 비행경험 여부에 따라 행복감 관련 구조모형에는 어떠한 차이가 있는지 검증해보았다. 이를 위해 한국아동․청소년패널조사(KCYPS, 2018)의 중학교 1학년 패널 1차년 데이터 1,129명의 자료를 활용하였다. 자료분석은 SPSS 22.0과 AMOS 22.0을 활용하여 구조방정식 모형의 검증을 실시하였다. 주요 연구결과를 요약하면 다음과 같다. 첫째, 부모관계와 또래관계는 그릿과 정서문제, 행복감에 직접적인 영향력이 있었으나, 교사관계는 그릿에만 직접적인 영향력이 있는 것으로 나타났다. 또한 그릿은 정서문제와 행복감, 정서문제는 행복감에 직접적인 영향력을 미치는 것으로 나타났다. 둘째, 부모관계와 또래관계는 행복감과의 관계에서 그릿과 정서문제를 통한 각각의 부분매개효과가 있었고, 그릿과 정서문제를 순차적으로 거쳐 행복감에 간접적인 영향을 미치는 것으로 나타났다. 또한 교사관계는 행복감의 관계에서 그릿을 통한 완전 매개효과가 있었고, 그릿과 정서문제를 순차적으로 거쳐 행복감에 간접적인 영향을 미치는 것으로 나타났다. 끝으로 비행경험에 따른 집단 간 비교에서 비행집단에서는 또래관계가 행복감과 정서문제에 직접적인 영향력이 있었지만, 일반집단에서는 유의하지 않았다. 이러한 본 연구결과는 청소년들의 행복감에 관련 변인들의 구조적 관계를 비행경험 여부에 따라서 그 차이를 살펴보았다는 점에서 의의가 있다. 이를 바탕으로 청소년기 행복감과 관련하여 주요 시사점 및 후속연구를 제안하였다. The purposes of this study were to investigate the structural relationships among adolescent’s perception of parental relationships, peer relationships, teacher relationships, grit, emotional problems, happiness, and to find out whether there were differences in the structural relationships among such variables by delinquency behavior. A total of 1,129 middle school students, whose data was taken from the Korea Children & Youth Panel Survey(KCYPS, 2018) were used in this study. The results of the analysis were as follows. First, adolescent`s perception of parental relationships, and peer relationships had a direct and significant effect on grit, emotional problems, and happiness. Additionally, student-teacher relationships had a direct and significant effect on grit, but it had not a direct effect on happiness. Second, the results of the analysis demonstrated that grit and emotional problems partially mediated the relationships between parental relationships and happiness, and peer relationships and happiness. Moreover, grit fully mediated the relationships between student-teacher relationships and happiness. Furthermore, grit and emotional problems double-mediated between social relationships (parental, peer, student-teacher) and happiness. Finally, there was a significant difference in the structural relationships of the variables influencing happiness between the ordinary and delinquent groups. Based on these results, the implications were discussed and further studies were suggested.