• The Journal of the Korea Contents Association
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• v.21 no.8
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• pp.571-579
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• 2021

This study aims to identify the relationship between ADHD trait and game addiction among high school students, and to examine the double mediating model of hardiness and emotional use of music on that relationship. Participants were 254 male and female high school students. World Health Organization ADHD Self-Report Scale, Short Form of Hardiness Questionnaire, Use of Music Inventory, and Internet Gaming Use-Elicited Symptom Screen were used for this study. PROCESS Macro 3.5 Model 6 was used to analyse a double mediating effect. Results revealed that ADHD trait was negatively correlated with hardiness of high school students, and positively correlated with emotional use of music and game addiction. And, hardiness of high school students was positively correlated with emotional use of music and negatively correlated with game addiction, whereas emotional use of music was negatively correlated with game addiction. It was found that hardiness and emotional use of music were sequentially mediating ADHD trait and game addiction among high school students. These findings suggest that hardiness and emotional use of music play some special roles in the path in which adolescents' ADHD trait affects game addiction.

• Journal of Biomedical Engineering Research
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• v.33 no.2
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• pp.59-64
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• 2012

With rapid increasing usage of smart phones, social concerns have arisen about the possible effects of electromagnetic fields emitted from wideband code division multiple access(WCDMA) mobile phones on human health. The number of people with self-reported electromagnetic hypersensitivity(EHS) who complain of various subjective symptoms such as headache, insomnia etc. has also recently increased. However, it is unclear whether EHS results from physiological or other origins. In this double-blinded study, we investigated physiological changes such as heart rate, respiration rate, and heart rate variability with real and sham exposures for 15 EHS and 17 non-EHS persons using a module inside a dummy phone. Experiment was conducted using a WCDMA module with average power of 24 dBm at 1950 MHz with the specific absorption rate of 1.57 W/kg using a headphone for 32 min. As a conclusion, WCDMA RF exposure did not have any effects on the physiological variables in either group.

• Korean Journal of Optics and Photonics
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• v.35 no.5
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• pp.241-249
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• 2024

In this study, we demonstrate compact mode-locked laser operations using three different kinds of Yb³⁺-doped potassium double tungstate laser crystals, Yb:KGdW, Yb:KYW and Yb:KLuW, operating near 1040 nm at a repetition rate of 405 MHz. We utilized a semiconductor saturable absorber mirror as a mode locker, successfully maintaining mode-locked states for several hours without any Q-switching instabilities for all types of laser crystals. Notably, the Yb:KGdW mode-locked laser produces the shortest pulse with a duration of 108 fs, delivering 125 mW of output power. Additionally, we conducted a numerical analysis by solving the Haus master equation, which incorporates the effect of group delay dispersion and self-phase modulation, using the standard split-step Fourier method.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.5
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• pp.219-225
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• 2014

This paper describes an IC for Power Factor Correction. It can use electrical appliances which convert power from AC to DC. The power factor can be influenced not only phase difference of voltage and current but also sudden change of current waveform. This circuit enables current wave supplied to load by close to sinusoidal and minimum phase difference of voltage and current waveform. A self oscillated 10[kHz]~100[kHz] pulse signal converted to PWM waveform and it chops rectified full wave AC power which flows to load device. The multiplier and zero current detector circuit, UVLO, OVP, BGR circuits were designed. This IC has been designed and whole chip simulation use 0.5[um] double poly, double metal 20[V] CMOS process.

• Journal of Ginseng Research
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• v.43 no.4
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• pp.676-683
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• 2019

Background: Korean Red Ginseng (KRG) is widely used for strengthening the immune system and fighting fatigue, especially in people with deficiency syndrome. However, there is concern that the long-term application or a high dose of KRG can cause "fireness" (上火 in Chinese) because of its "dryness" (燥性 in Chinese). The aim of this study was to assess the safety and efficacy of a 4-week treatment with KRG in participants with deficiency syndrome. Methods: This was a 4-week, randomized, double-blind, placebo-controlled clinical trial. A total of 180 Chinese participants were randomly allocated to three groups: placebo control group, participants were given a placebo, 3.6 g/d; KRG 1.8 g and 3.6 g groups. The primary outcomes were the changes in fireness and safety evaluation (adverse events, laboratory tests, and electrocardiogram). The secondary outcomes were the efficacy of KRG on fatigue, which include the following: traditional Chinese medicine (TCM) symptom scale and fatigue self-assessment scale. Results: Of the 180 patients, 174 completed the full study. After 4 weeks of KRG treatment, the Fire-heat symptoms score including Excess fire-heat score and Deficient fire-heat score showed no significant change as compared with placebo treatment, and no clinically significant changes in any safety parameter were observed. Based on the TCM syndrome score and fatigue self-assessment score, TCM symptoms and fatigue were greatly improved after treatment with KRG, which showed a dose- and time-dependent effect. The total effective rate was also significantly increased in the KRG groups. Conclusion: Our study revealed that KRG has a potent antifatigue effect without significant adverse effects in people with deficiency syndrome. Although a larger sample size and longer treatment may be required for a more definite conclusion, this clinical trial is the first to disprove the common conception of "fireness" related to KRG.

• Journal of Oriental Neuropsychiatry
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• v.23 no.4
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• pp.133-152
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• 2012

Objectives : The purpose of this study is to investigate the effect of Sihogayonggolmoryeo-tang on the anxiety of Hwa-byung. Methods : In this randomized, double blinded, placebo-controlled study, we planned to give Sihogayonggolmoryeo-tang or controlled medication for anxiety of Hwa-byung. Hamilton Anxiety Scale (HAM-A) was measured as the 1st evaluative instrument, and Korean State-Trait Anxiety Inventory (STAI-K), Likert scale for major symptom of Hwa-byung, Hwa-Byung Scale Score, Korean Beck's Depression Inventory (BDI-K), Korean State-Trait Anger Expression Inventory (STAXI-K), Insomnia severity Index (ISI), Instrument of Oriental Medical Evaluation for Hwa-Byung, WHO Quality of Life Avvreviated (WHOQOL-BREF), genral self-Efficacy Scale (GSES), Rosenberg Self-Esteem Inventory (SRE) and Heart Rate Variability (HRV) were also measured as the 2nd evaluative instrument before treatment. Results : Clinical characteristics-vital signs and demographic characteristics showed no significant difference between both groups. The characteristics of disease-chief complaint, pattern Identification, period, etiological factor, and etc, also showed similarity of distribution in both groups. The results of Chest PA, EKG and clinicopathologic examination showed no significant difference between both groups. There were no significant difference between both groups in all valuation scales; HAM-A was measured as the first evaluative instrument, and STAI-K, Likert scale for major symptom of Hwa-byung, Hwa-Byung Scale Score, BDI-K, STAXI-K, ISI, Instrument of Oriental Medical Evaluation for Hwa-Byung, WHOQOL-BREF, GSES, SRE and HRV. Conclusions : We considered that establishment of the experimental group and controlled group was objective and worth conducting this research. In addition, this methodology is expected to be applied to the subsequent research. Further, we hope to make up for this study through various study and discussion.

• Journal of the Daesoon Academy of Sciences
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• v.33
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• pp.63-90
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• 2019

In pluralistic political realities that have been exposed as antagonistic relationships between self and others, the principle of 'Coincidentia Oppositorum' in Daesoon Thought emphasizes the complementarity between self and others and presents us with a new form of cognition and attitude which can overcome pluralistic political realities. Though solipsism that objectificates others on the basis of the self, the principle of 'Coincidentia Oppositorum' presents us a new form of cognition and attitude with which we can approach others. The principle of 'Coincidentia Oppositorum' is based on the logic that we can secure and extend ourselves only in relation between self and others. Self is not fully formed or perfected without others. Previous discussions on the principle of 'Coincidentia Oppositorum' as it is exists within Daesoon Thought have been limited to Eastern Philosophy. On one hand, this inclination may be due to a narrow understanding of Western Philosophy. The flow of Modern Western Philosophy can at times be a self-reflective output for solipsism. On the other hand, the understanding of the principle of 'Coincidentia Oppositorum in context of a dualistic contrast between Eastern Philosophy and Western Philosophy is not concordant with the principle of 'Coincidentia Oppositorum' which emphasizes the creation of harmony between self and others. This paper aims to investigate avenues to create harmony between Eastern Philosophy and Western Philosophy regarding the principle of 'Coincidentia Oppositorum' in Daesoon Thought. Specifically, attention will be paid to 'flesh' as used by Merleau-Ponty. In his writings, flesh is the matrix which activates the fundamental involvement between self and others. Self is a being of flesh and an ambiguous being which is formed in a double position (seeing and being seen). Flesh can secure and extend the self only through its relationship to an other or multiple others. Restoring the other that has been excluded from modern Western Philosophy, Merleau-Ponty's flesh call for contemplation into the meaning of the other and of otherness.

• Journal of Animal Science and Technology
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• v.50 no.5
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• pp.633-640
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• 2008

With a double mismatch primer set designed for amplifying the modified DNA sequence fragments, bovine melanocortin-1 receptor(MC1R) gene encoded in Extension locus which plays a critical role in coat color development was analyzed using polymerase chain reaction mediated restriction fragment length polymorphism(PCR-RFLP). Amplified PCR fragments were successfully discriminated with combining the MspI- and AluI-RFLP into three major alleles(ED, E+, and e), directly related to bovine coat color phenotypes. The genotyping results showed that Jeju black cattle contained three MC1R alleles, but yellowish-red colored Hanwoo and bridle colored Korean Brindle cattle did not contained the dominant black allele ED. However, two dominant black-colored cattle breeds, Holstein and Angus, contained the ED allele over 96% in frequency. Hanwoo×Holstein F1 and Hanwoo×Angus F1 crossbred calves showed ED/e MC1R genotypes, and uniformly black coat color. the results suggested that this MC1R genotyping method be useful in allele discrimination for bovine MC1R gene which used for breed classification and characterization, as one of the important genetic markers, using combination of MspI- and AluI-RFLP for modified PCR product amplified with a newly designed double mismatch primer set.

• The Journal of Fisheries Business Administration
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• v.30 no.1
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• pp.119-147
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• 1999

This article is subject to the rationalization of the cold-storage warehouse management, which gives the stabilization of the fishery production and the food life with respect to fisheries industry. In this point of view, the article examines to the structure of the cold-storage warehouse industry from the perspective of the industrial organization. To put it concretely, the article intends to apprehend the state of the structure of the industry and analyze the cold-storage warehouse's management activities. In addition, I try to find know the factors that affect the management performance(profitablity) of the industry through the cross-sectional correlation analysis. Finally, the conclusion of the article can be described as follows : \circled1 On the basis of the cold-storage capacity, there is the tendency that the industry concentrate in the area of Pusan(41.7%). \circled2 By formulating step of development of the industry, it is divided by six types. Type I is designed as raw material-storage warehouse for self-processing. Type IIis the raw material-storage warehouse for self-processing and storage-sale warehouse. Type III is the raw material-storage warehouse for self.distribution. Type IV is the raw material-storage warehouse for self-distribution and storage-sale warehouse. Type V is the net storage-sale warehouse. Type Ⅵ is the physical distribution center warehouse. Although each region has one representative type,6 types exist in all regions. \circled3 The competition structure of the industry has double structure on the basis of cold-storage capacity. \circled4 With respect to the management activity of the cold-storage warehouse, there is no change or even a decrease not increasing or not any change in sales from 1996 to 1997 \circled5 In order to try to induce the amount of shipper's materials, services that a cold-storage warehouse supply with its users include a custody-fee discount, a distribution-process service, a finance service, quality management service and so on. One of the best attractive services is the custody-fee service. \circled6 In the structure and management activity of the industry, the factors that affect management performance (profitablity) are a custody-fee discount, sales ability and capital structure of individual firm. Positive factor is sales ability and capital structure of individual firm. But, The custody-fee discount turns out to be a negative capital structure of individual film.

• Proceedings of the Korean Society of Crop Science Conference
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• 1999.11a
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• pp.102-144
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• 1999

The major problems of food crop cultivation in Korea are low yield of most crops except rice. inefficient cultivation techniques for aged farmers. and low international competibility. Therefore, development of cultivation techniques of food crops should aim the yield. quality improvement, labor reduction and production cost. The primary issue for increasing the yield of soybean, barely and wheat is to reduce the yield gap between the farmer's yield and recommended ones of experiment station. More advanced cultivation techniques needs to be developed. and/or the conventional breeding methods to be reconsidered. The newly developed labor-saving mechanized technique needs to reduce labor hours , and the cost of agricultural implements and machineries. In other words the labor-saving mechanized technique should be developed based on the improvement of total farming system as well as systemic fundamental innovation of cultural methods. The efficiency of solar energy use in food production of Korea in 1997 is as low as $0.52{\%}$ so there is much room to increase yield. It is recommendable that the concept of food Production should be changed to energy Producing efficiency Per unit area basis from volume and weight of food materials. Moreover, introduction of resonable cropping system is needed to increase yield of main crops, farmer's income, solar energy use efficiency, and decrease of land service expenditure. Current cropping system emphasized on economic crops. especially in vegetables , is not desirable for resonable use of arable land. stability of agricultural management and staple food crop self-sufficiency ratio. It is desirable to increase food crops . that are energy of carbohydrate and protein rich and land dependent crops. in cropping system. And the agronomist should develop the cultural methods to replace food crops for food self-sufficiency and stable farming management instead of economic crops in current cropping system. Low-input and environmentally-sound crop cultivation techniques, especially nitrogen-reducing culture technique which is directly related to food crop quality, also needs to be developed urgently. The extended cultivation of corn in upland and barely and wheat in lowland as a feed stuffs is recommended to prevent further decrease of food self-sufficiency ratio, which is mainly caused by the high reliance on imported feed grain. It is also considered that the calculation and presentation methods of standard agricultural income needs to be improved. The current calculation method uses unit land area of 10a regardless of crop kinds , characteristics of agricultural management and cultivation scale. So, it is apt to lead misunderstanding of farm income value. Therefore. it should show an income of average farmers for certain number of years. Research and developing system for food producing is not desirable because they are conducted currently individual crop and mono-culture basis. But actual agricultural income is usually earned by cropping system including upland and lowland. For example. the barley and wheat is usually cultivated in double cropping system. The cooperation among research institutes such as university agribusiness. government and farmers is indispensible. The public information and education on importance and consumption habit of food crops is necessary in Korean society to increase food self-sufficiency through nationwide cooperation.