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鄭信一,都是弘,張志元 釜山水産大學校 1981 釜山水産大學 硏究報告 Vol.21 No.2
TEM을 採用한 一定溫度制御方式의 laser光送信器에서 電力損失을 줄이기 위한 方式이 제안되었다. 특히 종전의 drop 方式의 溫度制御器에서 TEM에 大電流를 供給하는 電力트랜지스터에서의 電力損失이 커서 스윗칭 구동방식을 도입하여 回路를 構成하고 drop 方式과 그 特性을 測定하여 比較하였다. 그 結果를 要約하면 다음과 같다. 1. 周圍溫度 15~50℃의 범위에서 drop方式의 1.3℃ 變化에 對해 0.2℃ 程度로 laser diode 放熱板의 溫度를 거의 一定하게 維持할 수 있었다. 그 結果 周圍溫度變化에 對해 5%/℃의 光出力變化를 갖는 laser diode를 가정할 때(실제는 laser diode에 따라 3~10%/℃ 變化) drop 方式에서 018%/℃에서 0.03%/℃로 매우 安定된 光出力을 얻을 수 있다. 2. 이 回路에서의 消費電力은 종전方式에 比해 20~50℃ 溫度범위에서 약 20~30%의 減少를 보였다. 3. 종전 方式에서는 -15V와 -5V의 두가지 直流電源이 必要하였으나 이방식에서는 +5V 또는 -5V의 단독電源을 使用하므로 실제 시스템의 적용에 아주 편리하다. 4. 電力트랜지스터에서의 電力消費가 작으므로 電力트랜지스터용 放熱板의 크기를 줄일 수 있어 光送信器의 小型化가 可能하다. 이 외에도 現在 laser diode의 칩을 TEM의 냉각부에 설치한 TEC-PAC laser diode가 開發되어 生産되므로 장래 많은 利用이 期待된다.
都是弘,鄭信一,張志元 釜山水産大學校 1981 釜山水産大學 硏究報告 Vol.21 No.2
이 기간동안 釜山地區의 環境放射能을 調査 硏究한 結果를 要約하면 다음과 같다. 1. 공중부유진애의 방사능 年平均値는 ??정도이고 最大計數値는 109.28±1.20pμCi/cc며, 이는 중공의 제 5차 核實驗의 影響이라고 생각된다. 2. 落塵의 放射能 年平均値는 ?? 程度이고, 最大計數値는 中共의 제15차 핵실험에서 나타난 49.78±0.01mCi/㎢-10days 였으며, 제5차 核實驗時에는 年平均値보다 상당히 큰 25.14±0.02mCi/㎢-10days를 나타내었다. 3. 降水物은 1969年부터 1980年 사이에서 測定値를 얻었으며, 放射能 년평균치는 ?? 정도이고 最大計數値는 ??이다. 이는 中共의 제16차 핵실험의 영향이라고 생각된다. 4. 中共의 제5차 核實驗을 제외한 核實驗에서는 釜山地區 環境放射能의 영향은 거의 없는 것으로 나타났다. 이것은 核爆發地의 氣流가 氣象條件으로 인하여 우리나라 上空을 통과하지 않고 우회하였다고 생각된다. 5. 環境放射能 測定結果들은 우리나라의 放射性 동위원소등의 관리 및 그에 의한 방사선장해방어령에 규정된 放射性 同位元素(β放射體)의 空氣中 許容濃度 및 水中 許容濃度에 미치지 못했다.
Shin Jeewon,Kwon Yoowon,Kim Ju Hee,Jeong Sujin 대한소아청소년과학회 2023 Clinical and Experimental Pediatrics (CEP) Vol.66 No.2
Background: Recent studies reported that prepregnancy body mass index (BMI) and weight gain during pregnancy affect birth weight and contribute to childhood obesity. However, no such data are available in Korea.Purpose: This study gathered data on weight gain during pregnancy and its impact on birth weight and childhood obesity in Korea.Methods: We reviewed 1,753 singleton full-term babies born at CHA Bundang Medical Center in 2014–2016. We first review each maternal and baby factor based on prepregnancy BMI (underweight, normal, overweight/obese) and then divided them into low, normal, and excess gestational weight gain (GWG) groups based on the American Institute of Medicine (IOM) guidelines. We reviewed the characteristics of each group and analyzed the association between maternal GWG based on IOM guidelines and child BMI after 6 years.Results: The maternal prepregnancy BMI group showed a significant difference in birth weight and child BMI at 6 years. As the prepregnancy BMI increased, the birth weight and BMI at 6 years also increased (P<0.001). Mean birth weight and child BMI at 6 years differed significantly among the GWG groups. Furthermore, excess postpartum weight gain increased the risk of childhood overweight and obesity (odds ratio, 2.21; 95% confidence interval, 1.40–3.49).Conclusion: Excess weight gain during pregnancy should be avoided due to its short- and long-term association with childhood obesity. Owing to the high prevalence of excess GWG and childhood obesity, excess weight gain during pregnancy can have significant public health implications.
Shin, Chul-Soo,Hong, Min-Seon,Shin, Hang-Chel,Lee, Jeewon The Korean Society for Biotechnology and Bioengine 2001 Biotechnology and Bioprocess Engineering Vol.6 No.4
The co-expression of the arg U gene in a double-vector expression system of recombi-nant Escherichia coli BL22(DE3)[pET-IEN2a+pAC-argU] significantly enhanced the production level of reconminant human interferon -$\alpha$2a(rhIFN-$\alpha$2a) in high cell density cultures, compared to a recombinant E. coli culture containing only the single expression vector, pET-IEN2a. The dry cell mass concentration increased to almost 100 g/L, and more than 4 g/L of rhIFN-$\alpha$2a was accumu-lated in the culture broth. Evidently, the synthesis of rhIFN-$\alpha$2a was strongly dependent on the pre-induction growtih rate and more efficient at a higher specific growth rate. The additional sup-ply of tRN $A^{Arg(AGG/AGA)}$ enhanced the expression level of the rhIFN-$\alpha$2a gene in the early stage of the post-induction phase, yet thereafter the specific production rate of rhIFN-$\alpha$2a rapidly de-creased due to severe segregational instability of plasmid vector pET-IEN2a. It would appear that the plasmid instability with only occurred to pET-IEN2a in the double vector system, was re-lated to the effect of translational stress due to the over expression of rhIFN-$\alpha$2a.
Jeewon Lee,Shin-Gyeom Kim,HyunChul Youn,Soyoung Irene Lee 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.11
Objective Young adults putting off marriage and having less children have become recent trends in many modern societies. Yet less is known about the psychological factors underlying the drastically low marriage and fertility rates. We hypothesized that childhood maltreatment experience may have a negative association with one’s marriage and childbearing intention. Methods A total of 1,004 college students (mean age of 20.8±2.3 years, 56.1% female) completed self-questionnaires including sociodemographic information, marriage and childbearing intention, Patient Health Questionnaire 9 (PHQ-9), and Childhood Trauma Questionnaire (CTQ). Multivariable logistic regression analyses were conducted to evaluate the effect of childhood trauma on marriage and childbearing intentions after controlling for sociodemographic variables and depression. Results 29.7% had no intention to get married and 40.4% had no intention to have children in the future. The prevalence of physical, sexual, and emotional abuse was 33.1%, 18.5%, and 22.3%, respectively. Multivariable logistic regression analyses revealed that female (p<0.001), poor health status (p=0.001), and childhood emotional abuse (p=0.01) were independent predictors of no desire to get married. Female (p<0.001), poor health status (p<0.001), and childhood emotional abuse (p=0.038) were also predictors of no desire to have children. Conclusion Childhood emotional abuse may be the most damaging form among other types of childhood maltreatment because it can occur more pervasively and persist for a longer period, causing extensive damage to a child’s emotional, social and cognitive development. Raising awareness regarding the life-long consequences of childhood emotional abuse and the need to prevent and detect childhood emotional abuse should be emphasized.
Suicidal Ideation of the Elderly According to Their Involvement in Grandchild Care
Jeewon Lee,Areum Lee,Doeun Lee,Han-Young Jung,Shin-gyeom Kim,Soyoung Irene Lee 대한신경정신의학회 2019 PSYCHIATRY INVESTIGATION Vol.16 No.8
The purpose of the present study was to examine the severity of suicidal ideation of the older adults according to the amount of involvement in grandchild care. Data for this research were drawn from a cross-sectional study conducted on community-dwelling adults aged 65 years or older. The 922 participants were divided into three groups according to their involvement in grandchild care: 18.5% had provided daily care, 12.4% had provided occasional care, and 69.1% had never cared for their grandchildren. ANCOVA analysis showed that the scores for depression was significantly lower in the group which took care of their grandchildren occasionally compared to the other two groups. The scores for suicidal ideation was significantly higher in the group which had never taken care of their grandchildren compared to the other two groups. Current study suggests that grandparenting may have a positive effect on suicidal ideation of the older adults.