HPLC를 사용한 쌀 중 잔류농약 동시분석법

최재천,이영자,김소희,최수영,최희주,정성욱,박흥재,김우성 한국환경과학회 2005 한국환경과학회지 Vol.14 No.4

A simple and sensitive analytical method based on RP-HPLC with UV detector(225 nm) and mobile phases using 0.1% phosphoric acid and acetonitrile was developed for simultaneous determination of quinclorac, bentazone, 2,4-D, bensulfuron-methyl, dymuron, capropamide, pencycuron, ethofenprox. This method was resulted in recovery of 78~ 96% with RSD 3.3~7.5%. LODs 0.12~0.84 and LOQs 0.34~1.20 ㎎/L. Calibration curves were linear with r of 0.9995~ 0.9999.

Comparison of risk and protective factors associated with smartphone addiction and Internet addiction

Choi, Sam-Wook,Kim, Dai-Jin,Choi, Jung-Seok,Ahn, Heejune,Choi, Eun-Jeung,Song, Won-Young,Kim, Seohee,Youn, Hyunchul Akadémiai Kiadó 2015 JOURNAL OF BEHAVIOURAL ADDICTIONS Vol.4 No.4

<P><B>Background and Aims</B></P><P>Smartphone addiction is a recent concern that has resulted from the dramatic increase in worldwide smartphone use. This study assessed the risk and protective factors associated with smartphone addiction in college students and compared these factors to those linked to Internet addiction.</P><P><B>Methods</B></P><P>College students (<I>N</I> = 448) in South Korea completed the Smartphone Addiction Scale, the Young’s Internet Addiction Test, the Alcohol Use Disorders Identification Test, the Beck Depression Inventory I, the State–Trait Anxiety Inventory (Trait Version), the Character Strengths Test, and the Connor–Davidson Resilience Scale. The data were analyzed using multiple linear regression analyses.</P><P><B>Results</B></P><P>The risk factors for smartphone addiction were female gender, Internet use, alcohol use, and anxiety, while the protective factors were depression and temperance. In contrast, the risk factors for Internet addiction were male gender, smartphone use, anxiety, and wisdom/knowledge, while the protective factor was courage.</P><P><B>Discussion</B></P><P>These differences may result from unique features of smartphones, such as high availability and primary use as a tool for interpersonal relationships.</P><P><B>Conclusions</B></P><P>Our findings will aid clinicians in distinguishing between predictive factors for smartphone and Internet addiction and can consequently be utilized in the prevention and treatment of smartphone addiction.</P>

지역사회에서 형성된 사회적 지지와 근로자의 사회심리적 스트레스간의 관련성

임화영,김형수,최영환,장성훈,이건세,정최경희,오원기,최재욱,정춘화 대한산업의학회 2006 대한직업환경의학회지 Vol.18 No.4

Objective: This study was performed to examine the relationship between community-based social support and psychosocial distress in workers. Methods: The study subjects were 596 workers recruited from 11 companies in Chungju city. A structured questionnaire was used to assess sociodemographics, health-related behaviors, job characteristics, job stress, work-based social support, community-based social support and level of psychosocial distress. Results: Hierarchical multiple regression analysis showed that workers with no chronic disease, exercise and sufficient sleep had a higher score of psychosocial distress than those with chronic disease, no exercise, and not enough sleep. Coworker's work-based social support and community-based social support were negatively associated with psychosocial distress. The R square value of total independent variables on psychosocial distress was 0.409, and that of community-based social support on psychosocial distress was 0.052. Conclusion: This study showed that community-based social support served as a protective factor against psychosocial distress in some workers. We recommend the establishment of a worksite stress reduction program in occupational level as well as community-based social support.

유방암의 뇌하수체 전이에 의한 양안 시력소실 1 예

최낙원,안명주,김재민,박동우,박용욱 한양대학교 의과대학 2000 한양의대 학술지 Vol.20 No.1

Pituitary gland metastasis is a rare clinical diagnosis, usually made in the setting of known primary systemic cancer with widespread metastasis to other organs. But visual loss as a presenting symptom of metastasis to the pituitary gland is unusal. We report here a case of 45-year-old woman who had been diagnosed as having metastatic breast cancer involving bone and liver 2 years ago, and received high dose chemotherapy with peripheral blood stem cell transplantation, developed sudden bilateral complete visual loss. At initial presentation, the patient had no light perception and no pupillary response to light in both eyes, but without evidence of panhypopituitarism, or diabetes insipidus. Brain MRI showed a large enhanced mass invasion to the cavernous sinus and extension to the suprasella portion without dura or base-of-skull metastasis. Pathologic examination showed metastatic breast cancer. Despite the transsphenoidal decompression surgery of metastatic tumor, the visual loss was not improved.

안면부에 발생한 고정형 스포로트리쿰증 3례

최윤애,류영욱,정재봉,송준영,이규석 啓明大學校 醫科大學 1993 계명의대학술지 Vol.12 No.3

We experienced 3 cases of fixed type cutaneous sporotrichosis confined to the face. Case 1 was a 32-month old child, affected over the nose. Case 2 was a 25-year old man, affected over the left cheek. Case 3 was a 71-year old man, affected over the nose. Histopathologically, chronic granulomatous inflammation with pseudoepitheliomatous hyperplasia was observed. Mycologically, typical dark brown to black colored colonines with moist, wrinkled and membranous surfaces were cultured. All patients were completely cured by oral administration of saturated KI and itraconazole combined therapy in a short period(40-90 days).

가새배치에 따른 고층건물의 변위에 관한 연구

최영화,임헌욱 대구대학교 산업기술연구소 2014 産業技術硏究 Vol.25 No.1

Mordern structures tend to be high-rise buildings because of the population growth, restraint of lands and the high value of lands. In aspect to the control of lateral displacement, the importance of wind load and seismic load is also increasing to get the resistance against lateral load. The purpose of this study is to analyze the base building and 12-case models according to the bracing arrangement, the relative stiffness ratio of column and girder, the number of floor and the bracing section area by using MIDAS/GENw computer program. The results are as followings ; 1. Case 2 is effective in the vertical bracing arrangement. 2. Case 6 is effectual in the group bracing arrangement. 3. Case 8 and 10 are efficient in the diagonal and the horizontal bracing arrangements, respectively. 4. Case 8 among the diagonal bracing arrangements shows the smallest displacement value in all 12 cases, compared with the base building by decreasing as much as 48%.

近代建築에 있어서 形態의 對稱性에 關한 硏究

崔武革,權寧煥,金正在,李郁 경북대학교 공과대학 1985 工大硏究誌 Vol.14 No.-

The symmetry has been denied in modern architecture. But the meaning of symmetry in modern architecture should not able to be interpreted by the static symmetry of the past, because the form in modern architecture, based in the zeitgeist, were the pursuit of free formal construction appearing through the use of new material, the priority of function, the need of new style and the concept of time-space. So the purpose of this study is to find out the symmetrical tendency in modern architecture by six kinds of the symmetry in new arithmetic conception:reflection, cyclic, translation, enlargement, spiral, glide symmetry. As a result of analysis, the architectural form of the grand masters in modern architecture is not simply free form but geometrical form of the more complex dynamic symmetry.

생물막 공정에서 질소제거효율 향상을 위한 유기성담체의 효용성 검토

최동욱,최영균,김대영,김윤중,정태학 대한상하수도학회 2003 상하수도학회지 Vol.17 No.3

Availability of organic media for improving nitrogen removal efficiency in a biofilter process was studied. Although, aerobic and anoxic phase could be clearly divided during the operation of single-stage biofilter process and nitrification efficiency was about 80%, denitrification efficiency was very low due to depletion of organic substrate in anoxic phase. However, the deficiency could be improved by addition of organic media in anoxic phase from the simulated result. Nitrogen removal efficiency in a biofilter process packed with organic media in anoxic phase was predicted to be 29% higher than that packed with inorganic media. In addition, about 79% of nitrogen removal efficiency could be obtained from a column test using organic media innoculated by activated sludge. Improvement in nitrogen removal efficiency was responsible for organic leaching from the organic media and the leaching rate was 0.21㎎COD/g-org.media/day.

횡문근융해증과 급성 신부전 및 범발성 혈관내 응고장애를 동반한 열사병 1예

최대은,박수진,권오경,이한규,이영모,이상주,나기량,이강욱,신영태 충남대학교 의학연구소 2003 충남의대잡지 Vol.30 No.2

Heat stroke is a life-threatening illness characterized by an elevated core body temperature that rises above 40% and central nervous system dysfunctions that results in delirium, convulsions, or coma. Heat stroke is subdivided into two forms, classic and exertional. Since strenuous exercise is one of the major exacerbating and precipitating factors, the incidence of exertional heat stroke is high among young adult, especially military personnel undergoing military training. Exertional heat stroke commonly causes rhabdomyolysis, lactic acidosis, acute renal failure, shock and pulmonary edema. We report a case of heat stroke with rhabdomyolysis, acute renal failure, disseminated intravascular coagulopathy(DIC) after strenuous exercise. A 18 year old man was admitted to the hospital because of loss of consciousness. He was a wrestler and he had tried to lose 6kg in weight by jogging and strenuous exercise on that summer day with hot temperature. The development of this illness was favoured by much clothes inappropriate for that environmental condition with a purpose to enhance sweating, and by restricted intake of water and food. On admission, the blood pressure was 80/50mmHg, and body temperature was 39.4℃ with stuporous mentality. Laboratory finding were as follows : in complete blood cell count, hemoglobin was 16.7g/dL and platelet count was 158,000/ mm³. In blood chemistry, AST 1061U/L, ALT 201U/L, BUN 30mg/dL, Cr 2.2mg/dL, LDH 941IU/L, CK 696IU/L were resulted. In arterial blood gas analysis, pH 7.39, pCO₂ 30mmHg pO₂ 86mmHg, HCO₃ 18.4mEq/L, O₂ saturation 96.7% were resulted. In urinalysis, specific gravity 1.025, protein 3+, erythrocyte 2+ were resulted. In brain imaging study, brain CT finding was normal. After appropriate treatments with rapid cooling, hydration and supportive care, he improved with alert mental status. On 2nd hospital day, in laboratory result, thrombocytopenia and coagulopathy were appeared and renal insufficiency was aggravated. So he was treated with platelet concentrate and fresh frosen plasma for DIC, and enough hydration for appropriate urine volume preservation. After all, On 22nd hospital day, he fully recovered and discharged. Nowadays, with followed for some duration, he is wellbeing with no complications.

황산이온 포착용 보호컬럼을 가진 이온 크로마토그래피에 의한 선택적인 음이온의 동시검출

최용욱,김종훈,김미경,최윤정,이수영 전주대학교 자연과학종합연구소 1997 전주대학교 자연과학연구소 학술논문집 Vol.10 No.3

Simultaneous detection method for measuring anions in drinking water except sulfate ion was developed by suppressed ion chromatography. Eluent with existing composition between carbonate and bicarbonate made the separation of early eluting anions poor. Therefore, it is necessary to use weaker eluent to increase the resolution of them. However, this caused elution time of sulfate ion to take long, consquantely, total pinning time was more than 60 minutes. In order to resolve this problem by use of column switching with guard column for trapping sulfate ion, the resolution of the rest 8 anions was enhanced, total running time was also shortened within 10 minutes. Usage of eluent with existing composition made possible determination of sulfate ion on guard column within 4 minutes. Calibration curves of 8 anions represented linearity of better than 0.999 and detection limits by this method of all the anions considered were between 0.04 and 0.002 mg/L