• Proceedings of the Korean Society of Laser Processing Conference
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• 2006.11a
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• pp.103-107
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• 2006

Decapsulation of EMC(Epoxy Molding Compound) in package device is a method used to inspect inside of device by removing plastic molding. So far, chemical etching and mechanical grinding methods have been used widely. Recently, several works using laser have been carried out. This method has advantages with fast process time and precision than conventional methods because of noncontact process. Also, laser process is a clean process because of removing EMC directly without using toxic chemicals. The wavelength of laser used in this study is 355nm. Key parameters of removing EMC are laser power, scan speed, and number of scans of laser. It if confirmed that laser decapsulation is a useful process to inspect inside a device with a small thermal damage to chip surface.

• Journal of Environmental Science International
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• v.2 no.4
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• pp.347-356
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• 1993

The three natural zeolites collected in Yungil-gun, Kyungsangbuk-do, Korea, were analyzed by means of chemical wet methods and X-ray diffraction. The results indicated that the primary species of those zeolites were clinoptilolite mixed with heulandite, feldspar, montmorillonite, and quartz. These zeolites were chemically treated with NaOH, $\textrm{Ca(OH)}_2$, and HCl solution and their differences were also studied with X-ray diffraction method. The capabilities of removing $Cs^+$ and Sr^{2+}$ ions with chemically untreated zeolites, chemically treated zeolites, and also with synthetic zeolites were compared. The effect of other cations in removing Sr^{2+}$ ions was also studied. The experimental results showed that$Cs^+$ and Sr^{2+}$ ions could be removed up to 98% and 95% respectively out of 5 ppm with chemically untrearted natural zeolites. The treatment of 0.02N-$\textrm{Ca(OH)}_2$ and that of 2N-NaOH were most effective In removing $Cs^+$ and Sr^{2+}$ ions, respectively. It was found that the mountaintop of Sangjung 1-dong natural zeolite treated with 2N-NaOH was most efficient in removing Sr^{2+}$ ions mixed with other cations, compared with any other chemically treated and untreated natural zeolites in this work.

• Horticultural Science & Technology
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• v.29 no.4
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• pp.293-297
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• 2011

This experiment was conducted to elucidate the effects of mulching materials and removing time of the transparent polyethylene (PE) film on the growth of garlic at Uiseong experimental field, Korea. The experimental mulching materials comprised of transparent polyethylene film (0.025 mm) and net polyethylene (NPE). Plant height and leaf number of garlic were highest at PE treatment when the PE removing date was March 18 and this treatment also promoted the no. of cloves. Length of leaf sheath and bolting rate were highest and bulb weight loss rate was lowest at PE + NPE treatment when the PE removing date was March 18. But clove number was the lowest in this treatment compared to conventional PE film treatment. Conventional mulching method accelerated secondary growth rate but bulb weight loss was vice versa. There were statistically no differences in bulb diameter among treatments but conventional treatment positively focused on bulb diameter. Whenever PE film remove can suppress weeds compared to no mulching treatment but the dry weight of weeds were increasing trends as the removal dates of PE film were delayed. Transparent PE or PE + NPE treatments can be recommended to grow best quality garlic when PE film removing date is March 18.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.52 no.3
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• pp.271-275
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• 2016

Recently, pollution problem in coastal water has become more serious and pollution including red tide serves as a main reason for reduction of fishes resources. Particularly, nutrients such as nitrogen and phosphorus are the most serious pollutants. Normally, biological wastewater treatment process is used in removing such nutrients. However, it is difficult to adopt the biological wastewater treatment process to a small-scale fish processing factory in case of using seawater as wash water. Thus, removing nutrients through struvite crystallization is investigated in this study for treating shrimp processing wastewater. Experiments were conducted by varying molar ratio of $Mg^{2+}:NH^4-N:PO^4-P$ from 1:1:1 to 2:1:1. It can be concluded that optimum molar ratio is 1:1:1. Struvite crystallization process is compared with chemical coagulation process using PAC and struvite crystallization process is proven as the more effective process in removing nutrients from wastewater. In view of results obtained from these experiments, struvite crystallization process is a promising method in removing nitrogen and phosphorus from wastewater; however, not so good in removing organics. Thus, struvite crystallization process is suitable as the pre-treatment process in treating shrimp processing wastewater and additional biological process is needed to remove organics.

• Journal of Bio-Environment Control
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• v.20 no.1
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• pp.58-61
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• 2011

This study was conducted to develop an optimal pruning method for okra production. Three pruning methods were tested including apical bud removing, one-third removing from the top of plant, and no pruning as a control with 3 kinds interval for 15 days after 2 months sowing. The growth and development of okra was better at the treatment of one-third removing of plant than the others. The number of branches was 0.7 in control, 3.7~4.0 in apical bud removing, and 3.0~6.0 in one-third removing treatment. In summary, one-third pruning of plant from the top of plant at 30 days after starting of pruning treatment, which showed the highest yield by 12,910 kg/10a.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2001.04a
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• pp.398-401
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• 2001

This paper presents rough cutting pat고 drilling. This method has differences from conventional method which uses boundary curve by intersecting object to machine and each cutting plane. Die-cavity shape is drilled in z-map, we select various tool and remove much material in the short time. as a result, this method raise productivity. The major challenges in die-cavity pocketing include : 1)finding an inscribed circle for removing material of unmachined regions, 2) selecting optimal tool and efficiently arranging tool, 3) generating offset surface of shape, 4) determining machined width according to the selected tool, 5) detecting and removing unmachined regions, and 6) linking PJE(path-joining element). Conventional machining method calling contour-map is compared with drilling method using Z-map, for finding efficiency in the view of productivity.

• The Journal of Internal Korean Medicine
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• v.21 no.4
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• pp.615-619
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• 2000

Objective : The prostatic disease is characterized as relatively incurable, chronic and recurrent illness. Because of this property, we have the difficulty in treating this illness. Besides, the drug selectivity is restricted to the specific prostatic membrane, the barrier of prostate. This study was to evaluate the efficency of the activating blood flow and removing blood stasis Method to Prostatic disease. Methods : We investigated 51 prostatic patiens with NIH chronic prostatitis symptom index, digital rectal examination(DRE), expressed prostatic secretion(EPS). After investigation we treated the patients with herb which was aimed to activate the blood flow and remove the blood stasis method to prostatic disease. Results : After the treatment, symptom index score of the prostatic patients was reduced from 11.7 to 7.4. The cure rate of 51 prostatic patients was 76.5%. Also the cure rate of the patients who was treated over 4 weeks was higher than the patients treated below 4 weeks, 87.5% to 66.7% respectively. conclusions : These results indicate that oriental medical theraphy is useful enough to treat the prostatic patients. Therefore, the more research about the herb which has activating blood flow and removing blood stasis effect is necessary.

• The Journal of Internal Korean Medicine
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• v.15 no.1
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• pp.210-226
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• 1994

This study was performed to investigate the gastric cancer through the journal of oriental medicine since 1990. The following results have been obtaied. 1. The Herb-medication in Gastric Cancer was composed to the oral-method and the injection-method. but, the oral-method was major and the injection-method rarely used. 2. In the treatment of Gastric Cancer, the Herb-medication that copperated with the operation and chemotherahpy was much more used 3. In the oriental medical therapy, the therapy for invigoration(補法) was common used. and the therapy for regulating vital energy(理氣), removing blood stasis(祛瘀), relieving pain(止痛), clearing away the heat evil (淸熱), removing toxic material(解毒) was used. 4. The following Herb was much more used to threat the Gastric Cancer.

• Proceedings of the IEEK Conference
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• 2003.07e
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• pp.1920-1923
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• 2003

This paper presents compression rate improvement for SPIHT algorithm though redundancy bit removing. Proposed SPIHT algorithm uses a method to select of optimized threshold from feature of wavelet transform coefficients and removes sign bit if coefficient of LL area. Experimental results show that the proposed algorithm achieves more improvement bit rate and more fast progressive transmission with low bit rate.

• Journal of the Korean Institute of Navigation
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• v.20 no.4
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• pp.99-109
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• 1996

Though median filter is used for removing noise and smoothing image. But, the result of it has distortion around edge. And then, this paper proposes new noise removing algorithm by recursive morphological processing. Basic operation is same each other, but there is some different processing method between recursive morphology and general morphology theory. This recursive morphological filter can be viewed as the weighted order static filter, and then it has a weighted SE(structuring element). Especially using this algorithm to remove the 10% gaussian noise, this paper confirmed that PSNR is improved about 0.642~1.5757 db reserving edge well better than the results of the traditional median filter.