발언대 : 선원문제 , 어떻게 풀 것인가 - ' 선원복지로 메리트를 부여해야 '

강정욱 한국해사문제연구소 1989 (月刊)海洋韓國 Vol.189 No.-

DME도입 시장환경

강정욱,Gang, Jeong-Uk 한국LP가스공업협회 2006 LP가스 Vol.105 No.-

연료로서의 DME 디메틸에테르(화학식 CH -O-CH ,DME)는 당초 가정용 캔 스프레이 등 분사 약제인 프레온의 대체 물질로 사용되기 시작했다. 그 후 양호한 압축 착화성이나 무연 연소하는 성질을 가지는 등 디젤 엔진의 연로로서 LP 가스와 동등한 증기압을 가져 LP가스의 대체연료로서 현재 전 세계에서 활발히 연구개발이 이뤄지고 있다. DME의 재료는 천연가스, 석탄, 바이오매스 등 다양한 자원에서 제조가 가능한데 이들로부터 합성가스(CO,H )를 추출.합성해 제조한다. 이것은 경제규모에 미달하는 부존자원의 유효한 이용이나 자원의 다양화에도 연결되기 때문에 차세대 연료로서 주목받고 있다. 천연가스로부터 저가로 대량 생산이 가능한 직적법이나 메탄올을 탈수해 제조하는 간접법 등 제조 기술도 확립되어 있다.

제주 애플망고 씨앗 추출물의 부위별 이화학적 특성 비교

강정욱,유단희,현승훈,최호민,이인철 대한미용학회 2022 대한미용학회지 Vol.18 No.4

A study examining the physicochemical properties of extracts from different seed parts of mangifera indica L. from Jeju Island was conducted. Water, ethanol, and 1,3-butylene glycol extracts of other parts including seed, seed coat, and kernel in apple mango were prepared. Analysis of total polyphenol and flavonoid contents was performed. According to the results, apple mango kernel ethanol extracts (AMKE-E) showed higher content than other extracts. In addition, expression of AMKE-E was increased by radical scavenging activities of DPPH and ABTS, similar to the positive control, vitamin C. Inhibition of the activities of elastase by AMKE-E was confirmed. The results of HPLC analysis indicated that penta-O-glloyl beta D-glucose was the active compound in the extracts. The findings of this study demonstrate that AMKE-E can be used as a functional ingredient of cosmetics and exhibits antioxidant and elastase inhibition activity.

서비스 유형화 적합도와 조직성과 천연가스산업 실증 연구

강정욱,원석희,유영목 한국경영과학회 2013 한국경영과학회 학술대회논문집 Vol.2013 No.5

Impacts of Recurrent Tonsillitis on the Outcome of Powered Intracapsular Tonsillectomy in Children

강정욱,동성화,이선규,이건희 대한비과학회 2021 Journal of rhinology Vol.28 No.3

Background and Objectives: To investigate the effects of recurrent tonsillitis on postoperative outcomes after powered intracapsular tonsillectomy and adenoidectomy (PITA) in children with obstructive sleep-disordered breathing (oSDB). Materials and Methods: Children who underwent PITA in Kyung Hee University Hospital at Gangdong from 2016 to 2018 were classified into two oSDB groups according to comorbid chronic/recurrent acute tonsillitis (CHT). To evaluate the efficacy of the PITA technique, quality of life (QoL) was measured using the obstructive sleep apnea questionnaire (OSA-18) for 3 months after surgery. To evaluate the disadvantages of the PITA technique, we followed complications such as throat pain, otalgia, nausea, vomiting, and postoperative bleeding for 1 week after surgery. Finally, we compared the pre- and postoperative QoL and analyzed the incidence of postoperative complications in the oSDB with CHT (SDBwCHT) and oSDB without CHT (SDBsCHT) groups. Results: Of the 802 enrolled patients, 135 were classified as SDBwCHT and 667 as SDBsCHT. Both groups exhibited marked improvements in QoL after PITA. The SDBwCHT group showed a change of OSA-18 score from 70.7±17.0 to 31.2±11.4. The SDBsCHT group showed a change of OSA-18 score from 70.0±17.1 to 31.0±9.9. The groups did not demonstrate statistical differences in complication rates and severity of symptoms during the first postoperative week. Conclusion: Although comorbid CHT delayed improvement in postoperative symptoms, PITA is a useful technique to treat children with oSDB, regardless of CHT Background and Objectives: To investigate the effects of recurrent tonsillitis on postoperative outcomes after powered intracapsular tonsillectomy and adenoidectomy (PITA) in children with obstructive sleep-disordered breathing (oSDB).Materials and Methods: Children who underwent PITA in Kyung Hee University Hospital at Gangdong from 2016 to 2018 were classified into two oSDB groups according to comorbid chronic/recurrent acute tonsillitis (CHT). To evaluate the efficacy of the PITA technique, quality of life (QoL) was measured using the obstructive sleep apnea questionnaire (OSA-18) for 3 months after surgery. To evaluate the disadvantages of the PITA technique, we followed complications such as throat pain, otalgia, nausea, vomiting, and postoperative bleeding for 1 week after surgery. Finally, we compared the pre- and postoperative QoL and analyzed the incidence of postoperative complications in the oSDB with CHT (SDBwCHT) and oSDB without CHT (SDBsCHT) groups.Results: Of the 802 enrolled patients, 135 were classified as SDBwCHT and 667 as SDBsCHT. Both groups exhibited marked improvements in QoL after PITA. The SDBwCHT group showed a change of OSA-18 score from 70.7±17.0 to 31.2±11.4. The SDBsCHT group showed a change of OSA-18 score from 70.0±17.1 to 31.0±9.9. The groups did not demonstrate statistical differences in complication rates and severity of symptoms during the first postoperative week.Conclusion: Although comorbid CHT delayed improvement in postoperative symptoms, PITA is a useful technique to treat children with oSDB, regardless of CHT.

비파나무 잎 효소추출물의 항산화 및 콜라겐 생성능 증대 효과

강정욱,현승훈,김효민,유단희,조항의,이인철 한국피부과학연구원 2023 아시안뷰티화장품학술지 Vol.21 No.2

목적: 본 연구는 제주 비파나무 잎을 이용하여 효소추출물의 항산화 활성 및 진피섬유아세포 내 콜라겐 생성 증대 효과를 확인하는목적으로 진행되었다. 방법: 제주 비파나무 잎을 이용해 펩신 효소추출물을 제조 후 구성아미노산 분석을 진행하였다. 추출물의 항산화 효과를 확인하기 위해 라디칼 소거능 활성을 확인하였다. 진피섬유아세포 내 pro-collagen type 1 생성 활성을 통해 주름개선효능을 검증하였다. 결과: 구성아미노산 분석 결과, 비파나무 잎 효소추출물에서 16종의 아미노산이 분석되었다. DPPH 라디칼 소거능은 약 100 µg/mL에서 90.17±0.09%의 소거 활성을 나타내었으며, ABTS 라디칼 소거 활성도 농도의존적으로 활성이 증가한것을 확인하였다. 피부 주름개선 효능을 확인하고자 elastase 저해 활성을 확인한 결과, 최대 500 µg/mL에서 41.15±1.96%의 저해능을 확인하였으며, pro-collagen type-1 생성능도 농도 의존적으로 유의하게 증가한 것을 확인하였다. 결론: 제주 비파나무 잎 효소추출물의 항산화 및 콜라겐 생성 효능을 확인하여 기능성 화장품 소재로 가능성을 확인하였다.

SOME EXPLICIT PROPERTIES OF (p, q)-ANALOGUE EULER SUM USING (p, q)-SPECIAL POLYNOMIALS

강정욱 한국전산응용수학회 2020 Journal of applied mathematics & informatics Vol.38 No.1

In this paper we discuss some interesting properties of (p, q)-special polynomials and derive various relations. We gain some relations between (p, q)-zeta function and (p, q)-special polynomials by considering (p, q)-analogue Euler sum types. In addition, we derive the relationship between (p, q)-polylogarithm function and (p, q)-special polynomials.

인후두 역류 질환: 진단 및 치료

강정욱,은영규,Kang, Jeong Wook,Eun, Young-Gyu 대한후두음성언어의학회 2021 대한후두음성언어의학회지 Vol.32 No.2

Laryngopharyngeal reflux disease (LPRD) is an inflammatory condition of the upper aerodigestive tract mucosa induced by reflux content from stomach. Some of vocal cord diseases are associated with laryngopharyngeal reflux. Because of the pathophysiological features, proton pump inhibitor shows therapeutic effect on some vocal cord diseases. As like that, the gastric reflux contents can make macroscopic or microscopic morphological changes in the upper aerodigestive tract mucosa. Although the pathophysiology of LPRD is relatively clear, clinical diagnosis is still difficult. The diagnosis of LPRD includes objective tests such as 24-hours multichannel intraluminal impedance-pH metry and subjective tests such as questionnaire method. However, the objective verification of reflux is difficult due to invasiveness of the method, and the questionnaire methods have limitations because many symptoms are not specific for LPRD. Moreover, most methods are not fully standardized until now. Despite these limitations, many researchers are struggling to standardize diagnosis and treatment of LPRD, and there are several new achievements recently. Therefore, the purpose of this article is to review the recent literature on the clinical presentation, diagnosis, and treatment of LPRD, and to systematize our knowledge.

산소 플라즈마로 처리한 전도성 투명 BZO(ZnO:B)박막에 대한 전기적 특성

강정욱,유하진,손창길,조원태,박상기,최은하,권기청 한국진공학회 2010 한국진공학회 학술발표회초록집 Vol.38 No.-

Interpolation function of the multiple twisted q-Genocchi polynomials with weak weight α

강정욱,유천성 장전수학회 2013 Advanced Studies in Contemporary Mathematics Vol.23 No.3

Recently, many mathematicians have studies different kinds of the q-analogue of Genocchi numbers and polynomials(see [1-21]). In this paper, we give another definition of the multiple Hurwitz type q-zeta function with weak weight α. This function interpolates multiple twisted q-Genocchi polynomials with weak weight α at negative integers. Also we give some identities related to these polynomials.