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잠수장비와 수중환경에서 나타난 스쿠버 다이버들의 교육불이행
임현수(Lin, Hyun-Soo),강은석(Kang, Eun-Suk) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.5
This study is to follow the studies, which were conducted in Moon island between July and October in 2010. The previous studies, which were conducted by Lim, Hyun-soo and Kang Eun-suk in 2010, studied the current status of education of divers by classifying it into five subjects such as diving science, diving equipment, diving safety, underwater environment, and diving activities through FGI of expert groups. Being aware of the lack of materials about the observation of non-fulfillment of education on diving equipment and underwater environment and interviews, we made visits to the spots where the previous studies were conducted between July 28 and August 2nd to newly add up materials on interviews and questionnaires and analysed the cause and problems of the educational non-fulfillment about diving equipment and underwater environment. The educational non-fulfillment about diving equipment resulted in inappropriate management of equipment and loss of equipment, immature assembly of equipment of equipment, the loss of waist belts, and diving knife"s inappropriate use. The educational non-fulfillment about underwater environment brought about the damage of underwater environment, panic by underwater environment, conflicts with fishing villages, and the problems of trash-littering and defecation.
높은 입체선택성을 나타내는 고리카보네이트의 친핵성 치환반응과 광학활성인 β-Hydroxy Ester의 합성
강석구,박동철,노호식,윤승현,홍덕표 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.1
The nucleophilic ring opening of the cyclic carbonates of optically active threo-2,3-dihydroxy esters afforded α-substituted β-hydroxy esters with highly regio- and stereoselectivity under mild conditions. The α-substituted β-hydroxy esters were transformed to β-hydroxy esters
Pd 촉매하에서 allylic alcohol과 hypervalent iodine 화합물의 위치 선택적 vinylation에 관한 연구
강석구,이홍우,장수범,김태현,편성재 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2
The formation of carbon-carbon bond by palladium-catalyzed coupling of aryl or vinyl halides with olefins, known as the Heck reaction, has become a powerful tool in organic chemistry. In the case of allylic alcohols, palladium-catalyzed reaction of organic halides usually affords β-substituted ketones or aldehydes rether than β-substituted allylic alcohols.
진딧물의 경보페로몬인 (E)-β-Farnesene의 합성과 생물활성시험
강석구,정경운,이정운,고현관 성균관대학교 기초과학연구소 1986 論文集 Vol.37 No.1
(E)-β-Farnesene, the alarm pheromone of aphids was synthesized from nerolidol by reacting in a sealed tube at 150℃ for 24h with DMSO. Base(KOtBu/DMSO) catalized elimination of HCl from farnesyl chloride at 50℃ for 4h afforded (E)-β-farnesene as the major product. Farnesyl chloride was prepared from nerolidol or farnesol with SOCl_2 or HCl. Biological activity test of (E)-β-farnesene thus synthesized was conducted.
뚜렷한 입체 선택성을 갖는 알릴 디올의 고리 카보네이트와 아세토니드의 Wacker 산화 반응 연구
강석구,정경윤,정재욱,남궁은영,김태현 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.1
Palldium(Ⅱ) 촉매 하에서의 말단 알릴 디올의 고리 카보네이트와 아세토니드의 산화반응은 anti-Markovnikov hydation에 의해 알데히드 또는 α,β-불포화 알데히드 만이 생성되었다. 치환된 알릴 디올의 분자내 이중 결합의 반응으로는 (E)-알릴 디올의 경우에 β-케토 생성물을, 반면에 (Z)-알릴디올의 경우엔 α-케토 생성물을 얻을 수 있었다. 치환된 알릴 디올의 고리 카보네이트와 아세토니드에서는 각각 β-케토 화합물과 α,β-케토 화합물 들이 생성되었다. Palladium(Ⅱ)-Catalyzed oxidation of acetonides or cyclic carbonates of terminal allylic diols afforded aldehydes or α,β-unsaturated aldehydes as the sole products, resulting of anti-Markovnikov hydation. For the internal olefins of the substituted allylic diols, (E)-allylic diol provied β-keto-product, whereas (Z)-allylic diol affored α-keto-product. The acetonides and cyclic carbonates of the substituted allylic diols yielded β-keto-products and α,β-unsaturated ketones, respectively.
姜鎬祚,韓錫絃 건국대학교 1978 論文集 Vol.7 No.1
The nitrite content, VBN(volatile basic nitrogen) and bacterial count in pork sausage stored at various temperatures were examined for the evaluation hygienic condition of meat products. 1.Nitrite content of pork sausage was decreased from 3.1ppm to 2.2ppm in 25 days at 7℃, from 3.1ppm to 0.8ppm in 5 days at 25℃, and from 3.1ppm to 0.4ppm in 5 days at 36℃, respectively. 2.Nitrite content of pork sausage in which potassium nitrite was added was, however, increased from 3.1ppm to the maximum amounts of 15.2ppm, 118.3ppm and 97.6ppm when kept for 35 days at 7℃, 30 clays at 25℃ and 26 days at 36℃, respectively. 3.Content of VNB of pork sausage with potassium nitrate was increased from 11mg% to 40mg% after the storage for both 35 days at 7℃, 5 days at 25℃ and 5 days at 36℃. The bacterial counts of the pork sausage of 7˚, 25˚ and 36℃ groups were increased from 103 to 104,109 anti 109, respectively.
강석구,조현성,이재호 성균관대학교 기초과학연구소 1989 論文集 Vol.40 No.2
천연물 합성에서 출발물질로 유용하게 쓰이는 디아세톤 글루코스 헥소퓨라노스고리의 산화와 입체선택적 변형에 관하여 연구하였다. 이 고리의 C-3위치에 있는 히드록시기를 Trifluoroacetic anhydride(TFAA)로 사용하여 케토기로 산화시키는 방법을 연구한 후 얻어진 C-3 위치에 케톤에 대해 Grignard반응과 Wittig반응을 도입하여 퓨라노스고리의 C-3위치에 입체 선택적으로 치환기를 유도하는 방법을 연구하였다. 또한 고리밖의 곁가지의 변형도 아울러 연구하였다. We have studied on the oxidation and the stereoselective modifications of the hexofuranose ring derived from diacetone glucose. We have attempted the method of the oxidation with trifluoroacetic anhydride (TFAA) on the C-3 position of this furanose ring. On the other hand, we have induced the stereoselective substrate on the keto group of the C-3 position. The modifications of the side chain out of the ring have been also studied.
강석구,정경윤,박찬희,남궁은영,김태현 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2
The coupling reaction of iodobenzene with allylic diols in the presence of Pd(OAc)_2 and nBu_3P as catalysts using K_2CO_3 as base afforded the phenyl-substituted allylic diols. However, under the same reaction conditions with Et3N as base, phenyl-substituted α-hydroxy ketone was obtained.
Mechanical Alloying에 의한 Ti_xCu_90-xAl_10(x=50,60)의 비정질화 및 열적성질
강종욱,김현구,김혜숙,이상열 조선대학교 기초과학연구소 1996 自然科學硏究 Vol.19 No.1
Amorphous powders of the Ti_xCu_(90-x)Al_10(x=50,60) system were synthesized by mechanical alloying method under an argon atmosphere. The amorphization process of the Ti_xCu_(90-x)Al_10(x=50,60) powders after milling by MA were studied by XRD, SEM and DSC experiments. We found that the best milling conditions of the Ti_xCu_(90-x)Al_10(x=50,60) powders were a ball-to powder weight ratio of 15 : 1 and a revolving velocity of 250rev min^-1 in this experiment. XRD patterns of the Ti_xCu_(90-x)Al_10(x=50,60) powders obtained by MA showed broad peaks as the increasing of milling times of the powders. So we confirmed the amorphization of the powders. The position of peak intensity 2θ(max.) of amorphous powders decreased nearly linearly with the increase of titanium concentration. Average particle size of the Ti_xCu_(90-x)Al_10(x=50,60) powders were 20∼26㎛ from SEM micrograph. In the DSC experiment, crystallization temperature and peak temperature were observed to increase for the Ti_xCu_(90-x)Al_10(x=50,60) powders with increased titanium concentration. The activation energy of the Ti_50Cu_40Al_10 and Ti_60Cu_30Al_10 powders were 260.57 and 253.10KJ/mole, respectively. the crystallization fraction of the Ti_50Cu_40Al_10 and Ti_60Cu_30Al_10 powders were found to be 3.02% at 458℃ and 1.32% at 477.2℃.
강혁주,김성욱,최석진,이중현,장재식,서영범,윤병구,박건욱,김성자,김용섭,강승완,이구,양창헌,이창우,김욱년,이광헌,서정일 동국대학교 의학연구소 2000 東國醫學 Vol.7 No.-
과립상 세포종은 Schwann 세포 기원으로 생각되며 인체에 비교적 드물게 발생한다. 과립상 세포종은 전신 어느 곳에서나 발견될 수 있으나 주로 혀, 구강, 피부 혹은 유방 등에서 호발하며 드물게 위장관에서 발견된다. 위장관에서는 식도에서 가장 호발하며 다음으로 위, 대장 순이다. 과립상 세포종은 대부분, 특히 위장관에서는 양성이며 소수의 악성 병변이 보고되었다. 이러한 이유와 함께 수술 전의 진단이 어렵기 때문에 과립상 세포종에 대한 근본적인 치료는 현재까지 외과적 절제술이다. 최근에 시도되는 치료방법들로는 내시경적 레이저 치료, 용종절제술, 내시경적 점막 절제술 등이 있다. 저자들은 상부 소화관 내시경검사를 시행하여 식도 과립상 세포종을 진단하고 내시경적 점막 절제술을 시행하여 합병증 없이 퇴원하여 현재 재발없이 경과 관찰중인 1례를 경험하였기에 보고하는 바이다. Granular cell tumors, which occur infrequently, are probably of Schwann cell origin. They can occur almost anywhere in the body but usually affect the tongue, oral cavity, skin, or breasts and are rarely found in the gastrointestinal tracts. The esophagus is the most frequent gastrointestinal site, followed by the stomach and the colon. Granular cell tumors are generally benign, especially in the gastrointestinal tract, some malignant lesions have been reported. For this reason, and also because preoperative diagnosis is difficult, the standard treatment for granular cell tumor has until now been surgical excision. In recent years, other therapeutic methods is endoscopic laser therapy (ELT), polypectiomy, endoscopic mucosal resection (EMR). We report a case of esophageal granular cell tumor which was diagnosed by an endoscopy and managed using an endoscopic mucosal resection without complication.