• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2002.05a
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• pp.101-106
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• 2002

최근 사무환경에서 컴퓨터 사용시간이 급증함에 따라 컴퓨터 소음의 불쾌감으로 인한 저소음형 컴퓨터에 대한 요구가 증가하고 있다. 이에 따라 효율적인 소음조절을 위하여 컴퓨터 소음에 대한 실태 조사를 위하여 설문조사를 실시하였으며, 물리적 측정치와 더불어 심리음향학적 각종 파라메타를 계산하였다. 또한 일반적 업무 Task가 주어진 상태에서 컴퓨터 소음에 대한 근무자의 상하한계치 설정을 위한 청감실험을 실시하였다. 설문조사 결과, 가장 시끄럽게 인식되는 소음은 팬소음(사용자 컴퓨터)과 키보드 사용음(타인 컴퓨터)으로 나타났으며, 약 55%의 사용자들이 보통 컴퓨터 소음에 대해 시끄럽게 느끼고 있는 것으로 나타났다. 또한 현재 사용중인 컴퓨터의 소음에 대해 사용자의 약 20% 정도만이 조용하게 느끼며, 컴퓨터 소음이 업무효율을 떨어뜨린다는 응답도 약 35%로 나타났다. 팬소음, CD-Rom 구동음, HDD 작동음에 대해 청감실험을 실시한 결과, 각 소음의 상하한치는 각각 31∼51dB(A), 34∼54dB(A), 34∼58dB(A)로 나타났다.

• Proceedings of the Korean Biophysical Society Conference
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• 1996.07a
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• pp.26-26
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• 1996

The methionine-rich segments of the Fifty four homologue (Ffh) protein of Escherichia coli and its eukaryotic counterpart SRP54 are thought to bind signal sequences of secretory proteins. The structure of a chemically synthesized 25-residue-long peptide corresponding to one of the proposed methionine rich amphiphilic helices of Ffh was determined in water and in aqueous trifluroethanol (TFE) solution using CD ard NMR. (omitted)

• Journal of the Korean Society of Food Science and Nutrition
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• v.29 no.5
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• pp.758-761
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• 2000

This study was performed to investigate the contamination levels of harmful heavy metals that sampled from June. 1 to June. 31, 1999, at 3 areas in Jeonbuk west cost area. The heavy metal contents were determinated by ICPS (Inductively Coupled Plasma Spectrometer) method. The levels of total lead, cadmium, aluminum, zinc and copper were determined and the results were summarized as follows: The minimum and maximum values (ppm) of 3 areas of shellfishes (shortneck clam, hard clam, cockle clam, snail and top sell) were Pb: 1.29~4.35, Cd:0.12~0.37, Al: 9.45~54.06, Zn: 9.65~15.14, Cu: 0.62~1.64 ppm.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.23 no.54
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• pp.97-110
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• 2000

As more and more companies pursue ISO 9000 certification, one of the most misconceptions about ISO 9000 is that registration is necessary only for business. ISO 9000 is being driven by commercial requirements, not legal fiat. This registration can be used as evidence of compliance to the ISO 9000 to satisfy specific customer requirements. The primary objective of this research is to provide the efficient implementation process of ISO 9000 certification on the basis of total quality management concerning with ISO/CDl 9001:2000, ISO/CDl 9004:2000 and ISO/CD2 9001:2000. Based on the result of first paper in May 1999, this study has been conducted using the data collected from 312 manufacturing companies which registered ISO 9000 certification. This analysis can be applied to Korean small and medium industrial companies in establishing and maintaining the development of qualify systems. The companies should be able to benefit if they make continuous effort to improve the quality activities based on the factors suggested in this paper.

• Nuclear Engineering and Technology
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• v.54 no.10
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• pp.3957-3961
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• 2022

Deposition behaviors of Sr and Cs in various liquid cathodes, such as Zn, Bi, Cd, and Pb, were examined to evaluate their recovery from LiCl-KCl eutectic salt. Cations in the salt were deposited on the liquid cathode, exhibiting potential of -1.8 to -2.1 V (vs. Ag/AgCl). Zn cathode had successful deposition of Sr and exhibited the highest recovery efficiency, up to 55%. Meanwhile, the other liquid cathodes showed low current efficiencies, below 18%, indicating LiCl-KCl salt decomposition. Sr was recovered from the Zn cathode as irregular rectangular SrZn₁₃ particles. A negligible amount of Cs was deposited on the entire liquid cathode, indicating that Cs was hardly deposited on liquid cathodes. Based on these results, we propose that liquid Zn cathode can be used for cleaning Sr in LiCl-KCl salt.

• Bulletin of the Korean Chemical Society
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• v.33 no.2
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• pp.492-498
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• 2012

A hyper branched 10-butylphenothiazine with in-situ thermally curable methacrylate (1,3,5-tris-[$\{$10-Butyl-3-(4-(2-methyl-acryloyloxy)-phenyl)-7-yl-10H-phenothiazine$\}$]-benzene, (tris-PTMA)) was synthesized successfully. From the TGA thermogram of tris-PTMA was thermally stable up to $336^{\circ}C$. In the first heating scan of DSC thermogram, tris-PTMA showed glass transition temperature (Tg) at $140^{\circ}C$ and broad endothermic process in the region of $144-179^{\circ}C$, which is thermally curing temperature. In the second heating process, $T_g$ exhibited at $158.7^{\circ}C$ and endothermic process was not observed. Thermally cured tris-PTMA showed no big change in the UV-visible spectrum after washing with organic solvent such as methylene chloride, chloroform, toluene, indicating that thermally cured film was very good solvent resistance. Thermally cured tris-PTMA was electrochemically stable and the HOMO energy level of tris-PTMA was -5.54 eV. The maximum luminance efficiency of double layer structured polymer light-emitting diode based on in-situ thermally cured tris-PTMA was 0.685 cd/A at 16.0 V, which was higher than that of the device without thermally cured tris-PTMA (0.348 cd/A at 15.0 V).

• Research in Community and Public Health Nursing
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• v.10 no.2
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• pp.508-524
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• 1999

We would like to identify the current status and the problem of the material for sexual education in Korea by analyzing the contents and the subjects of the materials. The 274 materials were collected from 80 institutes from March 1999 to June 1999. The collected ones were analyzed according to title. year of production. producer. subjects of materials and contents. Also, the materials in the internet was searched. Result were summarized by the descriptive statistics with SPSS/PC as followings: Type of materials were video tape (155), books (70), projection slides (43) and CD-ROM (6); Number of production from each institute were 54 from Planned Parenthood Federation of Korea, 39 from Korea Broadcasting System. 23 from Seoul School Health Center. 22 from Seoul Education and Science Research Institute, 16 from Korea Sexual Violence Relief Center, 13 from Republic of Korean National Redcross. and 10 from Korea Educational Development Institute; Subjects of the materials were middle and high school children (55), teachers (35), primary schoolchildren (17) and adult (14), preschool children (5). One hundred forty eight materials did not indicate the specific subjects; Thirty institutes had been providing the information for sexual education and the counseling. According to the above results. we suggest the followings: The systematic development of materials for sexual education appropriate to the specific subjects should be done: Materials in the CD-ROM and internet homepage should be developed more and more; The evaluation tool should be developed and adapted to the materials for the recommendation of the good materials; Database of the sexual materials should be provided for further development, evaluation and utilization.

• Journal of Korean Society on Water Environment
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• v.28 no.2
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• pp.277-284
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• 2012

This study developed a new ceramics in which natural zeolite was mixed and calcined with industrial by-product such as converter slag, red mud, and fly ash and evaluated the feasibility of the ceramics for removal of heavy metals in acid wastewater. The removal rate of heavy metal by ceramics increased in the order of ZS (zeolite and slag) > ZR (zeolite and red mud) > ZF (zeolite and fly ash) ceramics. The alkalinity increment and coherence of ceramics were increased in the order of ZS > ZR > ZF ceramics. The mixing ratio of natural zeolite to industrial by-product for maximum removal efficiency of heavy metal was 1:1 for ZS ceramics and 1:3 for ZR and ZF ceramics. The order of removal efficiency of heavy metal was observed to be ZS > ZR > ZF ceramics under the mixing ratio of 1:1 for ZS ceramics and 1:3 for ZR and ZF ceramics. The removal efficiency of heavy metal by ZS ceramics with 1:1 mixing ratio was Al 100%, Cd 54.6%, Cr 99.9%, Cu 98.7%, Fe 99.9%, Mn 42.2%, Ni 59.9%, Pb 99.8%, Zn 87.6%, respectively. In addition, the removal capacity of heavy metal by ZS ceramics was observed to be Al 2.01 mM/g, Cd 0.27 mM/g, Cr 1.02 mM/g, Cu 0.83 mM/g, Fe 0.95 mM/g, Mn 0.41 mM/g, Ni 0.55 mM/g, Pb 0.25 mM/g, Zn 0.70 mM/g, respectively. The comparative evaluation in the light of removal capacity, alkalinity increment, and coherence of ceramics showed the ZS ceramics had higher feasibility as a media than others for removal of heavy metals in acid wastewater.

• Journal of Environmental Health Sciences
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• v.19 no.2
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• pp.46-54
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• 1993

This study was carried out on the stabilized/solidified treatment for the reducing leachability of hazardous heavy metals copper, lead, chromium and cadmium in the hazardous sludge which treated to be unleached heavy metals by sodium diethyl dithiocarbamate. Cement matrix was analyzed for the leachability of 24 hrs and dynamic leaching test, structure and the optimum condition for the stabilization and solidification of the hazardous sludge. In 28 days of curing time the unconfined compressive strength was 21.5 kg/cm$^2$ at the ratio of portland cement (0.5)+fly ash (0.25) and 23.5 kg/cmz at the ratio of portland cement (0.5)+fly ash (0.25) + cake (0.25). High concentration of Pb, Cr and Cd in the sea water and Cu in the distilled water were leached at the dynamic leaching test. The concentration of leaching heavy metals for specimens which were tested 24 hrs were found low leachability with decreasing pH of leachant. According to dynamic leaching test, the low level of copper, lead, cadmium and chromium were leached in the cement matrix with sodium diethyl dithiocarbamate. But the effective diffusion coefficient of unleached cement matrix which was treated sodium diethyl dithiocarbamate was decreased above 2 times than that of cement matrix. The relation of leachant renewal period (Y) and cumulative fraction ion leached (X) was the following regression equations. Solidification with unleached agent. Y$_{Cu}$ = 1413752X + 247, Y$_{Pb}$ = 223501IX + 214, Y$_{Cr}$ = 8310601X - 472, Y$_{Cd}$ = 168787X + 1061 The structure of' solidified matrix with X-ray diffraction analysis was composed more Ca(OH)$_2$, Si, Mg(OH)$_2$ and Al in the unleached cement matrix than those in cement matrix.

• Asian Pacific Journal of Cancer Prevention
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• v.16 no.12
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• pp.5111-5113
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• 2015

Background: To investigate the diagnostic and treatment methods for Chinese patients with gastrointestinal stromal tumor (GIST). Materials and Methods: From January 2004 to June 2014, patients diagnosed with primary GIST and treated by a single medical team in the Department of Digestive Disease of XuYi Hospital of Traditional Chinese Medicine were retrospectively recruited. Re-examination and follow-up was conducted regularly and abdominal enhanced CT, blood biochemistry and responses to surgery or imatinib were recorded. Results: A total of 15 patients were enrolled, including 9 male and 6 female patients, with an average age of 54 years (ranging from 32-81 years). The primary symptoms were abdominal uncomfortable in 5 patients, abdominal pain in 6 patients as well as nausea and vomiting in 4 patients. One patient was diagnosed with bowl obstruction at the first visit. All patients were treated with surgery, and tumor site was confirmed 1 esophagus, 6 stomach, 4 small bowel, and 4 colorectal and all patients were pathologically diagnosed with GIST. Immunochemical test positive for CD 117 was found 12 patients, and positive for CD 34 in7 patients. The median follow-up time was 24 months (range of 3-63). Three metastasis were confirmed 1.5, 2 and 2.6 years postoperatively. Three patients were treatment by imatinib postoperatively. Conclusions: Surgery remains the main treatment method for Chinese patients with GIST and imatinib could be feasible and safe for treating Chinese patients with GIST.