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ZnO–CuO core–branch nanocatalysts for ultrasound-assisted azide–alkyne cycloaddition reactions
Park, Ji Chan,Kim, A Young,Kim, Jae Young,Park, Sungkyun,Park, Kang Hyun,Song, Hyunjoon unknown 2012 Chemical communications Vol. No.
<P>ZnO–CuO core–branch hybrid nanoparticles, synthesized by copper oxide growth and controlled oxidation on ZnO nanospheres, exhibited remarkable enhancement of catalytic activity and stability for ultrasound-assisted [3+2] azide–alkyne cycloaddition reactions, due to their high surface area and active facets of the CuO branches.</P> <P>Graphic Abstract</P><P>ZnO–CuO core–branch hybrid nanoparticles were synthesized by copper oxide growth and controlled oxidation on ZnO nanospheres, and employed as a highly active heterogeneous catalyst for ultrasound-assisted cycloaddition reactions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc31654d'> </P>
Park Sungkyun,Ma Seong Won,Seo Hoekyeong,Lee Sang-Gil,Lee Jihye,Ye Shinhee 대한직업환경의학회 2023 대한직업환경의학회지 Vol.35 No.1
Background: In 2019, the International Agency for Research on Cancer re-evaluated the carcinogenicity of night-shift work and reported that there is limited evidence that night-shift work is carcinogenic for the development of prostate cancer. Therefore, in 2020 and 2021, the Korean Epidemiologic Investigation Evaluation Committee concluded that 2 cases of prostate cancer were occupational diseases related to the night-shift work. Here, we report the 2 cases of prostate cancer in night-shift workers which were first concluded as occupational diseases by the Korean Epidemiologic Investigation Evaluation Committee. Case presentation: Patient A: A 61-year-old man worked as a city bus driver for approximately 17 years, from 2002 to 2019, and was exposed to night-shift work during this period. In March 2017, the patient was diagnosed with high-grade prostate cancer through core-needle biopsy after experiencing stinging pain lasting for 2 months. Patient B: A 56-year-old man worked as an electrician and an automated equipment operator in a cement manufacturing plant for 35 years from 1976 to 2013 and was exposed to night-shift work during this period. In 2013, the patient was diagnosed with high-grade prostate cancer through core needle biopsy at a university hospital because of dysuria that lasted for 6 months. Conclusions: The 2 workers were diagnosed with high-grade prostate cancer after working night shifts for 17 and 35 years respectively. Additionally, previous studies have reported that high-grade prostate cancer has a stronger relationship with night-shift work than low or medium-grade prostate cancer. Therefore, the Korean Epidemiologic Investigation Evaluation Committee concluded that night-shift work in these 2 patients contributed to the development of their prostate cancer.
Woo, Hyunje,Park, Junha,Kim, Jiwoong,Park, Sungkyun,Park, Kang Hyun ELSEVIER 2017 CATALYSIS COMMUNICATIONS Vol.100 No.-
<P><B>Abstract</B></P> <P>We report a one-pot synthesis of hierarchical MnO/Pd-Fe<SUB>3</SUB>O<SUB>4</SUB> and CoO/Pd-Fe<SUB>3</SUB>O<SUB>4</SUB> nanocomposites containing scrolled multilayered nanosheets by controlled thermal decomposition of Fe(CO)<SUB>5</SUB> and reduction of metal precursors [Pd(OAc)<SUB>2</SUB>]. During the synthetic process, particles of amorphous MnO and CoO are immobilized on the Pd-Fe<SUB>3</SUB>O<SUB>4</SUB> support. These hierarchical nanocomposites follow a stepwise growth mechanism, initially forming Pd-Fe<SUB>3</SUB>O<SUB>4</SUB> seeds aggregated from nuclei, followed by growth to produce multilayered MnO/Pd-Fe<SUB>3</SUB>O<SUB>4</SUB> or CoO/Pd-Fe<SUB>3</SUB>O<SUB>4</SUB> structures. To the best of our knowledge, this is the first report on the hydroboration of styrene with bis(pinacolato)diboron using heterogeneous nanocatalysts. Among these catalysts, CoO/Pd-Fe<SUB>3</SUB>O<SUB>4</SUB> nanocomposites showed excellent performance due to the presence of a dual Pd and CoO catalytic system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A one-pot synthesis of hierarchical MnO/Pd-Fe<SUB>3</SUB>O<SUB>4</SUB> and CoO/Pd-Fe<SUB>3</SUB>O<SUB>4</SUB> nanocomposites was reported. </LI> <LI> Hierarchical nanocomposites exhibit a stepwise growth mechanism. </LI> <LI> CoO/Pd-Fe<SUB>3</SUB>O<SUB>4</SUB> nanocomposites showed excellent performance for the hydroboration of styrene. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Dong Joon Park,Sungkyun Park,Seong Won Ma,Hoekyeong Seo,Sang Gil Lee,Kyung-Eun Lee 대한직업환경의학회 2022 대한직업환경의학회지 Vol.34 No.-
Background: Some epidemiological studies have estimated exposure among flight attendants with and without breast cancer. However, it is difficult to find a quantitative evaluation of occupational exposure factors related to cancer development individually in the case of breast cancer in flight attendants. That is, most, if not all, epidemiological studies of breast cancer in flight attendants with quantitative exposure estimates have estimated exposure in the absence of individual flight history data. Case presentation: A 41-year-old woman visited the hospital due to a left breast mass after a regular check-up. Breast cancer was suspected on ultrasonography. Following core biopsy, she underwent various imaging modalities. She was diagnosed invasive ductal carcinoma of no special type (estrogen receptor positive in 90%, progesterone receptor positive in 3%, human epidermal growth factor receptor 2/neu equivocal) with histologic grade 3 and nuclear grade 3 in the left breast. Neoadjuvant chemotherapy was administered to reduce the tumor size before surgery. However, due to serious chemotherapy side effects, the patient opted for alternative and integrative therapies. She joined the airline in January, 1996. Out of all flights, international flights and night flights accounted for 94.9% and 26.2, respectively. Night flights were conducted at least four times per month. Moreover, based on the virtual computer program CARI-6M, the estimated dose of cosmic radiation exposure was 78.81 mSv. There were no other personal triggers or family history of breast cancer. Conclusions: This case report shows that the potentially causal relationship between occupational harmful factors and the incidence of breast cancer may become more pronounced when night shift workers who work continuously are exposed to cosmic ionizing radiation. Therefore, close attention and efforts are needed to adjust night shift work schedules and regulate cosmic ionizing radiation exposure.
SUSTAIN를 이용하여 상업지구, 위락시설지구의 유출 특성 비교 분석
최동호 ( Dongho Choi ),백상수 ( Sangsoo Baek ),정재운 ( Jaewoon Jung ),김성균 ( Sungkyun Kim ),윤광식 ( Kwangsik Yoon ),박하나 ( Hana Park ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-
도시화와 함께 도로, 주거지역, 상업지역 등 불투수면이 증가하고 있으며, 불투수면의 증가는 강우시 유출량 증가와 더불어 배출되는 비점오염원을 증가를 야기 시켰다. 비점 오염관련 전문가들은 부족한 예산, 제한된 자원, 불완전한 정보에 의해 도시개발에 따른 비점오염원의 영향평가 및 비점오염원의 저감 방안 수립에 현실적인 제한을 받고 있으며, 이에 따라 도시개발에 따른 비점 오염원의 적절한 관리를 위해 모델의 사용은 정책결정을 위한 매우 중요한 정보를 생산하게 된다. SUSTAIN은 GIS기반으로, 유역에서의 강우 유출 및 오염물질 이송, 해석, 최적관리기법(습지, 침투도랑, 저류지, 옥상녹화)을 도입 시 오염물질의 저감 예측, BMP 위치 및 규모 선정, 목표수질과 유량을 달성하기 위한 효과적인 비용을 산정 할 수 있다. 본 연구에서는 SUSTAIN모델이 우리나라의 도시환경에 실제로 적용 할 수 있는지를 평가하기 위해 BMP를 설치하지 않은 상태로 모델을 구동하였다. 적용지구인 상업지구 저밀도지역(광주광역시 서구 치평동 상무지구 내 먹자골목)은 불투수면적 85%, 투수면적 15%이며, 분류식 하수관거를 사용하고 있다. 위락시설지역인 어린이대공원(광주광역시 북구 운암동)은 중 불투수면적이 약 37%, 투수면적이 약 63%를 차지하고 있고, 분류식 하수관거를 사용하고 있다. 2008년부터 2012년도까지 상업지구 저밀도 지역 12회, 위락시설지역 10회, 총 22회의 강우사상에 모델을 적용하였으며. 모델 적용 평가 방법으로 R<sup>2</sup>, RMSE, NSE가 사용하였다. 상업지구 저밀도지역의 강우사상의 R<sup>2</sup>, RMSE, NSE의 평균 값은 각각 0.65, 10.23, 0.50 가 나타났고, 위락시설지구 어린이대공원은 강우사상의 R<sup>2</sup>, RMSE, NSE의 평균값은 0.70, 7.79, 0.60로 나타났다. 이 결과는 Ramanrayanan et al(1997)가 제안한 모델평가에서 R<sup>2</sup>가 0.5 이상이고, NSE가 0.4이상 일 때 모델이 자연 현상을 잘 모의한 것이라는 기준에 충족한 것으로 나타나 SUSTAIN 모델이 우리나라에서 적용하고, 사용할 수 있는 것으로 보인다.
Woo, Hyunje,Kim, Daeho,Park, Ji Chan,Kim, Ji Woong,Park, Sungkyun,Lee, Jae Myung,Park, Kang Hyun The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.42
<▼1><P>We report a one-pot synthesis of hybrid nanocomposites of Cu-doped Pd–Fe3O4<I>via</I> controlled thermal decomposition of Fe(CO)5 and reduction of Pd(OAc)2 and Cu(acac)2.</P></▼1><▼2><P>We report a one-pot synthesis of hybrid nanocomposites of Cu-doped Pd–Fe3O4<I>via</I> controlled thermal decomposition of Fe(CO)5 and reduction of Pd(OAc)2 and Cu(acac)2. Sodium oleate, used as a capping agent, affected both the morphologies and surface areas of the Cu-doped Pd–Fe3O4 nanocomposites. To the best of our knowledge, these magnetically recyclable hybrid nanocomposites are a new class of nanocatalysts, and the tandem synthesis of 2-phenylbenzofuran from 2-iodophenol with phenylpropiolic acid catalyzed by heterogeneous nanocatalysts has not been reported in the literature. Moreover, Cu-doped Pd–Fe3O4 nanocatalysts are superior to previously reported catalysts for this tandem reaction.</P></▼2>