Pt와 PbO₂전극에서 Iodide의 Cyclic Voltammetry

박인수,김학준 慶南大學校 附設 工業技術硏究所 1983 硏究論文集 Vol.1 No.-

지지전해질중에서 요오드화염의 전해산화반응을 검토하기 위하여 백금과 이산화납 전극에 대한 삼감전위주사법으로 싸이클릭 볼타모그램을 작성하여 비교하였다. 요오드 이온에 대한 백금의 전극반응은 산성하에서는 I₁??→I₂와 I₂→IO₃??의 두단계 반응으로 진행되는데, 전자는 가역적이고 후자는 비가역적이며 확산율속과정이다. 알칼리성에서는 I??→I₂와 I??→IO₃??의 두단계 반응으로서 비가역 과정이다. 요오드 이온에 대한 이산화납의 전극반응은 산성하에서는 PbO₂+2I??+2H?? →PbO+I₂+H₂O의 화학적인 반응과 그리고 I₂→IO₃??와 산소발생의 경쟁적인 반응이 일어나며, 알칼리성에서는 I??→IO₃??의 반응이 산소발생과 경쟁적으로 일어난다. Cyclic voltammetry and macro electrolysis studies are reported on platinum and lead dioxide electrodes for iodide in each supporting electrolyte. The oxidation of iodide due to platinum electrode reaction proceeds with two steps; the first corresponds to I??→I₂in both acid and alkali, and the second to I??→IO₃?? in acid and I??→IO₃?? in alkali. The former is reversible in acid and irreversible in alkali, while the latter is irreversible and diffusion rate controlling process. The oxidation of iodide due to lead dioxide reaction proceeds with two steps in acid; the first correcponds to PbO₂+2I??+2H??/ →PbO+I₂+H₂O chemically and the second to I₂→IO₃?? competed against oxygen gas evloution. In alkali, electrode reaction of I?? →IO₃? compete with O₂evolution.

HPLC를 이용한 농약 BPMC(2-sec-butylphenyl-N-methyl carbamate)의 측정법에 관한 연구

최학수,김창세 순천향대학교 1992 논문집 Vol.14 No.4

The measurements of pesticide BPMC were studied and following conditions were proposed as a most good methods; 1. There were detected at 254nm by means of Dupont model 850 UV detector. 2. Pesticide BPMC measurement was performed by means of Dupont model 8800, TMS column, 45% methanol as a solvent, flow rate 3.0ml/min. and chart speed 0.5 cm/min. 3. The relationships between the concentration and absorbance of pesticide BPMC were linear from 15 to 50mg/dl. 4. Deproteinization would be used satisfactorily in all of Folin-Wu, trichloroacetic acid and perchloric acid, and the recovery rate was also satisfactorily for all of them.

다공성 고분자수지 충전층에서 CO₂의 확산 및 분산

박인수,김학준 慶南大學校 附設 工業技術硏究所 1984 硏究論文集 Vol.2 No.-

이원세공고분자수지인 Amberlite XAD-2, XAD-4, XAD-7, 그리고 Amberlyst 15 충전층에서 CO₂의 확산계수 및 분산계수를 추산하기 위하여 선형흡착이론을 만족하는 저농도에서 펄스-응답의 모멘트를 해석하였다. 흡착열은 XAD-2<XAD-4<XAD-7<Amberlyst 15의 순서였다. 마이크로세공확산의 활성화에너지의 크기도 흡착열의 크기와 같은 순서였다. XAD-2의 경우, 마크로세공의 겉보기굴곡도는 1보다 작은 값인 0.8 이었으며, 이는 마크로세공에서 기상확산과 경쟁적으로 표면확산이 일어남을 시사한다. In order to estimate diffusion coefficient and axial dispersion coefficient of CO₂ in fixed bed of Amberlite XAD-2, XAD-4, XAD-7,and Amberlyst 15, we analysed moments of the pulse-response in the range of low concentration obeying the linear adsorption theory. The series of the heat of adsorption and the activation energy of micropore diffusion obtained from the first absolute moment and the second central moment were found to be XAD-2<XAD-4<XAD-7<Amberlyst 15. In the case of XAD-2, apparent tortuosity factor in macropore was found to be 0.8, less than unity. This indicates that surface diffusion takes place with gas phase diffusion compatatively in macropore.

교량구조물의 비탄성변위응답 평가를 위한 연성도감소계수 산정식 제안

송종걸,김학수 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A

The main objective of this study was to derive a formula of ductility reduction factor, expressed as R_(μ). To attain this objective, a study comprised reduction factors computed for stiffness degrading systems undergoing different levels of ductility and to investigate an accuracy of the formula. Based on this study, the main conclusions can be summarized :(1) The ductility reduction factor is primarily affected by the period of the system and the displacement ductility ratio. (2) The proposed formula is simpler and the inelastic deformations of bridge structures are better than those by the others formulas we used before.

교량구조물의 비탄성변위응답 평가를 위한 연성도감소계수 산정식 제안

송종걸,김학수 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B

The main objective of this study was to derive a formula of ductility reduction factor, expressed as R_(μ). To attain this objective, a study comprised reduction factors computed for stiffness degrading systems undergoing different levels of ductility and to investigate an accuracy of the formula. Based on this study, the main conclusions can be summarized :(1) The ductility reduction factor is primarily affected by the period of the system and the displacement ductility ratio. (2) The proposed formula is simpler and the inelastic deformations of bridge structures are better than those by the others formulas we used before.

중연계 무선네트워크 환경의 도로유지관리계측 시스템 개발에 관한 연구

이상우,송종결,남왕현,김학수 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B

Wireless Sensor Networks provide a new paradigm for sensing and disseminating information from various environments, with the potential to serve many and diverse applications. Recent advancement in wireless communications and electronics has enabled the development of low-cost sensor networks. The sensor networks can be used for various application areas. For different application areas, there are different technical issues that researchers are currently resolving. The current state of the art of sensor networks is captured in this article, where solutions are discussed under their related protocol stack layer sections. This article also points out the open research issues and intends to spark new interests and developments in this field. In order to evaluate the application of field monitoring system, lab tests field and FEM analysis are conducted. Therefore the accuracy of RFID wireless sensor data is verified.

중연계 무선네트워크 환경의 도로유지관리계측 시스템 개발에 관한 연구

이상우,송종걸,남왕현,김학수 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A

Wireless Sensor Networks provide a new paradigm for sensing and disseminating information from various environments, with the potential to serve many and diverse applications. Recent advancement in wireless communications and electronics has enabled the development of low-cost sensor networks. The sensor networks can be used for various application areas. For different application areas, there are different technical issues that researchers are currently resolving. The current state of the art of sensor networks is captured in this article, where solutions are discussed under their related protocol stack layer sections. This article also points out the open research issues and intends to spark new interests and developments in this field. In order to evaluate the application of field monitoring system, lab tests, field test and FEM analysis are conducted. Therefore the accuracy of RFID wireless sensor data is verified.

A Comprehensive and Comparative Review of Global Gastric Cancer Treatment Guidelines

Eom Sang Soo,Choi Wonyoung,Eom Bang Wool,Park Sin Hye,Kim Soo Jin,Kim Young Il,Man Yoon Hong,Lee Jong Yeul,Kim Chan Gyoo,Kim Hark Kyun,Kook Myeong-Cherl,Choi Il Ju,Kim Young-Woo,Park Young Iee,Ryu Keu 대한위암학회 2022 Journal of gastric cancer Vol.22 No.1

Countries differ in their treatment expertise and research results regarding gastric cancer; hence, treatment guidelines are diverse based on evidence and medical situations. A comprehensive and comparative review of each country’s guidelines is imperative to understand the similarities and differences among countries. We reviewed and compared five gastric cancer treatment guidelines in terms of endoscopic, surgical, perioperative, and palliative systemic treatment based on evidence levels and recommendation grades, as well as the postoperative follow-up strategies for each guideline. The Korean, Chinese, and European guidelines provided evidence and grading of the recommendations. The United States guidelines suggested categories for evidence and consensus. The Japanese guidelines suggested evidence and recommendations only for systemic treatment. The Korean and Japanese guidelines described endoscopic treatment, surgery, and lymphadenectomy in detail. The Chinese, United States, and European guidelines more intensively considered perioperative chemotherapy. In particular, the indications for chemotherapy and the regimens recommended by each guideline differed slightly. Considering their medical situations, each guideline had some diversity in terms of adopting evidence, which resulted in heterogeneous recommendations. This review will help medical personnel to comprehensively understand the diversity in gastric cancer treatment guidelines for each country in terms of evidence and recommendations.

지중해형 림프종 1예

김동완,송인성,김철우,김노경,방영주,방수미,임석아,김학균,류민희,허대석 대한소화기학회 1998 대한소화기학회지 Vol.32 No.1

Immunoproliferative small intestinal disease (IPSID) is constituted with a-heavy chain disease (α-HCD) and Mediterranean lymphoma. In contrast to western type of small intestinal lymphoma, the Mediterranean lymphoma is characterized by symptoms such as diarrhea, weight loss, malabsorption, and involvement of the distal duodenum and the upper jejunum. We present a case of the Mediterranean lymphoma. A male patient complained of diarrhea, fever, night sweats and weight loss for a year. An exploratory laparatomy revealed the small intestine to be diffusely thickened with malignant infiltration and to be perforated at one site. Jejunal resection was performed. On histologic examination, we confirmed it as malignant lymphoma of B-cell linage. This is the first case report of the Mediterranean lymphoma in Korea.

The influence of hypophosphatemia on outcomes of low- and high-intensity continuous renal replacement therapy in critically ill patients with acute kidney injury

( Soo Young Kim ),( Ye Na Kim ),( Ho Sik Shin ),( Yeonsoon Jung ),( Hark Rim ) 대한신장학회 2017 Kidney Research and Clinical Practice Vol.36 No.3

Background: The purpose of this study was to assess the role of hypophosphatemia in major clinical outcomes of patients treated with low- or high-intensity continuous renal replacement therapy (CRRT). Methods: We performed a retrospective analysis of data collected from 492 patients. We divided patients into two CRRT groups based on treatment intensity (greater than or equal to or less than 40 mL/kg/hour of effluent generation) and measured serum phosphate level daily during CRRT. Results: We obtained a total of 1,440 phosphate measurements on days 0, 1, and 2 and identified 39 patients (7.9%), 74 patients (15.0%), and 114 patients (23.1%) with hypophosphatemia on each of these respective days. In patients treated with low-intensity CRRT, there were 23 episodes of hypophosphatemia/1,000 patient days, compared with 83 episodes/1,000 patient days in patients who received high-intensity CRRT (P < 0.01). Multiple Cox proportional hazards analysis showed that Acute Physiology and Chronic Health Evaluation (APACHE) III score, utilization of vasoactive drugs, and arterial pH on the second day of CRRT were significant predictors of mortality, while serum phosphate level was not a significant contributor to mortality. Conclusion: APACHE score, use of vasoactive drugs, and arterial pH on the second CRRT day were identified as significant predictors of mortality. Hypophosphatemia might not be a major risk factor of increased mortality in patients treated with CRRT.