• Magazine of the Korean Society of Agricultural Engineers
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• v.17 no.3
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• pp.3885-3893
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• 1975

This work was intended to study the cutting graph and vibratory phenomina of a newly developed mower which may be suitable for mowing agricultural product having large and hard stems like corn and sugar beet. The system consists of cutter-bar having Curvilinear-translation motion, which attached to drag-crank mechanism. The motion of equation developed for experimental vibratory system which equipped with the cutter-bar system was established and the parameters defining the system's vibratory motion were experimentally determined. The optimum balancing weight for the cutter-bar am vibratory characteristics of the cutter-bar for various counterweight were analyzed to provide the design and operational conditions. The results of the study are summarized as follows; (1) The cutting graph by the new cutter-bar system depends upon the magnitude of ratio of forward travel(Vm) to crank speed (R$\omega$); The cutting pitch for Vm/R$\omega$ 1 (whole cycle cutting) and Vm/R$\omega$=2/$\pi$ (a half cycle cutting) are 2$\pi$ Vm and 4R, respectively. (2) The experimental vibratory system had been proved to function adequately so that it can be used in determining the required counterweight to minimize the vibratory motion of cutter-bar. (3) Experimentally determined counterweight to give the least vibratory motion was a little greater than the theoretically determined one. With the optimum counterweight it was possible to reduce up to about 87% of the amplitude without counterweight, which may be considered to be within safe operational region. (4) To avoid the actual operation of the cutter-bar at resonance which occured in low frequency ratio, it was considered that the rotational speed of the crank for a specific design of mower should be determined separately in connection with the desired cutting graph.

• Journal of Advanced Navigation Technology
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• v.12 no.1
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• pp.1-7
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• 2008

International Civil Aviation Organization(ICAO) adopted VOR(Very high frequency Omni-Range) as an international standard air navigation system in 1949 and recommended every country to make use of it in formulating air route and guiding take-off and landing of an aircraft. VOR is quite a useful navigation system so that more than 2,000 VORs have been installed all over the world including 39 in Korea: however, VOR signal could be easily affected by its circumstance like a mountainous area because it provides navigation information through AM and FM of VHF carrier. Therefore this study intends to investigate how much VOR performance is affected by its circumstances. For this purpose, the performance of the 10 VORs influenced by 24 obstacles are measured and analyzed by using an aircraft equipped with measuring instruments. This study may give us a feasible solution of problems related to the VOR siting in the future.

• KIEAE Journal
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• v.10 no.4
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• pp.137-145
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• 2010

Active sunlighting systems have been applied to deliver sunlight into the indoor space where natural light is insufficient, mainly because of the congested high-rise buildings in urban areas. Among various active sunlighting systems, a mirror sunlighting system which is simple structure and economically reasonable has been widely used in different types of spaces such as underground, north facing place and atrium. This study was to evaluate the mirror sunlighting systems, which were consisted of the first mirror of $3.5m{\times}2.5m$, the eight sets of the second mirrors of $1.0m{\times}1.25m$ and a sun tracker. Ten sets of the systems were installed for 40 apartment living rooms, the configuration of $3.5m(W){\times}4.0m(D){\times}2.5m(H)$ where sunlighting were not possible due to high retaining walls located in the front of the living rooms. The 45 HOBO data logger sensors for the indoor illuminance were equipped and 2 Li-cor photometers for outdoor illuminance. Both indoor and outdoor horizontal illuminances were monitored every second from 9am to 3pm on 17 January 2010 under clear sky condition. The results showed that the indoor illuminance of installed mirror sunlighting system was significant relationship with outdoor illuminance and increased the indoor illuminance level by 4.2 times on the whole floor space, by 8 times on the sun patch space of 6m2 and even by 2 times on the no sun patch space. In addition, the luminous conditions of the living room under real sky conditions met the KS recommendation for difficult task (600-1000-1500 lux) such as sewing and reading on whole floor space and sun patch space. It was proved that the benefits of mirror sunlighting systems included an effective technology for penetrating daylight into indoors where sunlighting was not possible and improving occupants' satisfaction and health, and contributing to energy saving in apartments during daytime.

• Proceedings of the Materials Research Society of Korea Conference
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• 2011.05a
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• pp.47.2-47.2
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• 2011

광전환 효율 20% (AM1.5G) 이상의 고효율 화합물 박막태양전지의 광흡수층으로 많은 관심을 받고 있는 $Cu(In,Ga)Se_2$ (CIGS) 태양전지의 광흡수층은 다양한 공정에 의해 제조가 가능하다. 현재 고효율 CIGS 셀 생성을 위해 널리 사용되고 있는 CIGS 흡수층 성장공정은 "co-evaporation (동시증발법)"과 2-step 공정이라 불리는 "precursorselenization(전구체-셀렌화)" 방법이다. 동시증발법은 개별원소 Cu, In, Ga, Se들을 고진공 분위기에서 고온(550~600$^{\circ}C$) 기판위에 증착하는 방법으로 소면적에서 가장 좋은 효율(~20%)을 보이는 공정이다. 하지만, 고온, 고진공 공정조건과 대면적 증착시 온도 및 조성 불균일 등의 문제점 등으로 상용화에 어려움이 있다. 전구체-셀렌화 공정은 1단계에서 다양한 방식(예: 스퍼터링, 전기도금, 프린팅 등) 방식으로 CuGaIn 전구체를 증착하고, 2단계에서 고온(550~600$^{\circ}C$)하에 H2Se gas 혹은 Se vapor와 반응시켜 CIGS를 생성한다. 일본의 Showa Shell와 Honda Soltec 등에 의해 이미 상업화 되었듯이, 저비용 대면적으로 상업화 가능성이 높은 공정으로 평가되고 있다. 하지만, 2단계에서 사용되는 H2Se 및 Se vapor의 유독성, 기상 Se과 금속전구체 간의 느린 셀렌화 반응속도, 셀렌화반응 후 생성된 CIGS 박막 두께방향으로의 Ga 불균일 분포, 생성된 CIGS/Mo 계면 접착력 저하 등의 문제점들이 개선, 해결되어야만 상업화에 성공할 수 있을 것이다. 본 연구에서는 Se layer가 코팅된 금속전구체의 셀렌화 반응메카니즘을 in-situ high-temperature XRD를 이용하여 연구하였다. 금속전구체는 스퍼터링, 스프레이 등 다양한 방법으로 제조되었고, 반응메카니즘 연구결과를 바탕으로 Se 코팅된 금속전구체를 이용한 급속열처리 공정의 최적화를 시도하였다.

• Convergence Security Journal
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• v.15 no.3_1
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• pp.31-39
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• 2015

The Female workforces opened the combatants which was not allowed so far including the artillery in the army, air defense, and etc. to the woman soldier in 2014. I exceeded 10,000 people in 2015 and it is in the plan to be expanded to 4,450 officers, 6,374 noncommissioned officers in 2017. A navy is the plan which selects the woman officer to board a submarine since 2017 and which I board over 3,000 t level in a submarine. But the institutional supplementation about this is insufficient although the woman soldier increased depending on the policy's decision. The role of the woman soldier was expanded and it was the time when the system developmental about the woman soldier management which is consistent with the future war aspect will have to be guaranteed, and the clear standard including the post circulation to the starting in advance of the woman soldier and human resource expansion and treatment, and etc. is required. I supplement the current regulation which I am applying as man soldier Army and the same standard although the woman soldier and man soldier Army has a difference and I analyze the phenomenon and the developmental solution should be suggested about the woman soldier people management.

• Physical Therapy Korea
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• v.5 no.2
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• pp.47-64
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• 1998

The purposes of this research were to understand the realities of health management and to analyze the subjective, functional, psychological, and social health effects of the application of an exercise and education program to manage health on an elderly population residing in an agricultural community. The specific purposes of this research were: 1. to determine the subjective, functional, psychological health conditions, and performance level of instrumental activities of daily living of both the experimental and control groups before introducing a health management program, and then 2. to compare these with both the experimental and control groups' subjective, functional, psychological health condition and performance level of instrumental activities of daily living after applying the health management program. The health management program was introduced to the experimental group (50 people) but not to the control group (50 people). The health management program was composed of a health exercise program and a health education program. A comparative study of subjective health conditions was done to examine the effect of the health management program and the characteristics of health related variables before and after the program application. The results were as follows: 1. When the experimental group, which had received the 8-week health management exercise and education program, was compared with the control group, which had not, the experimental group's subjective health condition scored higher than that of the control group (p

• The korean journal of orthodontics
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• v.24 no.4 s.47
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• pp.773-785
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• 1994

It has been generally believed that the impaction or eruption of mandibular third molars has significant correlations with the growth of the mandible, size of mandibular arch and size of teeth. The purpose of this study was to examine if there is any correlation between the status of eruption of mandibular third molars and the amount of mandibular crowding. The effect of missing of third moalrs to mandibular crowding was studied as well. 140 adult students of Yonsei University were selected and divided into three groups according to the status of mandibular third molars, Group 1) congenital missing group, Group 2) eruption group, and Group 3) impaction group. The tooth size, dimensions of the mandibular dental arch, and the amount of crowding were measured and compared. Results were as follows ; 1. There was no statistically significant difference in tooth size between the missing group and the eruption group(p<0.05). Impaction group showed larger total tooth material, inci- sal tooth material, and individual tooth size except central incisors compared to missing group (p<0.05). Impaction group showed larger total tooth material, incisal tooth material compared to eruption group as well(p<0.05). When individual tooth size was compared, impaction group had larger central incisors, canines, and second premolars than eruption group(p<0.05). 2. Missing group showed larger intermolar width than impaction group and it was stati- stically significant(p<0.05). 3. When compared the amount of total crowding, impaction group showed the largest am- ount of crowding, then eruption group, and missing group showed the least amount of crowding respectively(p<0.05). There was no statistically significant difference between missing stoup and eruption group in the amount of incisal crowding(p<0.05). Impaction group show- ed the largest amount of incisal crowding among all three groups(p<0.05).

• Journal of the Korean Academy of Clinical Electrophysiology
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• v.9 no.1
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• pp.15-21
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• 2011

Purpose : This study aims to examine the effects of action observation of ski simulation on electroencephalogram (EEG). Methods : Thirty healthy subjects were randomly divided into three groups: 10 participants in an AM (actual movement) group; 10 participants in an OM (observation) group; and 10 participants in a CM (control movement) group. The EEG was measured to examine changes in EEG between action observation and actually movement at 8 areas of the scalp for one minute before, during and after action observation. Results : Relative alpha power showed statistically significant differences among groups in Cz and C4 and there were interactions among groups in the Oz area. Relative beta power showed no statistical significance among groups and in particular, there were interactions among groups in the Oz area. Conclusion : These findings show that action observation affected brain activation as in actual movement. Thus it can be expected that when movement through the brain activation is applied to patients in bed rest or those who cannot perform actually movement, it can be utilized as physiotherapy.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.811-814
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• 2015

There are many modern societies use the digital products in everyday life in the Middle, convenience, give him plenty of Bluetooth is one of the users. Bluetooth (IEEE 802.15.1) means equipment in the close range between the low-power wireless communication standard for the connection to use the technology. Currently, Bluetooth earphone, Bluetooth speaker, wearable mounted devices also used a lot because it takes people to exploit the benefits had been lifted and thereby increases your damage. So, reducing the damage the user's further research about the security technique that can stop completely. I am sure that many Bluetooth hacking techniques, a Bluetooth device firmware vulnerability within the stored data to allow the approach to attacking the BlueTooth Snarfing and want to analyze.

• Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
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• v.1
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• pp.91-118
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• 1999

Die vorliegende Arbeit behandelt ein zweidimensionales Valenzmodell. In diesem Modell wurde der Versuch unternommen, durch Beruck­sichtigung $valenzunabh\"{a}ngiger$ Faktoren die bisherige eindimensionale Valenzkonzeption zu $\"{u}berwinden\;und\;f\"{u}r\;Problemf\"{a}lle$ der Valenz­forschung angemessenere $Erkl\"{a}rungen$ zu bieten. Dabei wurde mit Agel (1994) davon ausgegangen, $da\ss$ man zwischen Valenzpotenz und Valenzrealisierung unterscheiden sollte. Zwischen den beiden Ebenen besteht keine Isomorphie. Auf der Ebene der Valenz­potenz spreche ich von valenzgebundenen und valenzfreien Gliedern, auf der Ebene der Valenzrealisierung dagegen von notwendigen und optional en Gliedern. Somit ergeben sich insgesamt vier $M\"{o}glichkeiten:$ 1. valenzgebunden und notwendig; 2. valenzgebunden und optional; 3. valenzfrei und notwendig; 4. valenzfrei und optional. Viele $Problemf\"{a}lle$ der bisherigen Valenzforschung $geh\"{o}ren$ zu dem zweiten und dem dritten Typ. Erst die Annahme des zweidimensionalen Valenzmodells bietet $daf\"{u}r\;systematische\;Erkl\"{a}rungen$. Anhand verschiedener Beispiele wurde gezeigt, $da\ss$ syntaktische, semantische, pragmatische und konzeptuelle Faktoren die Valenzrealisierung beeinflussen. Valenzrealisierung ist somit nicht als $blo{\ss}e$ Wiedergabe der im Lexikon immanenten Valenzpotenz anzusehen. $Schlie{\ss}lich$ wurde am Beispiel yon gehen das $Verh\"{a}ltnis$ zwischen Valenzpotenz, konzeptuellen Prozessen und Valenzrealisierung dargestellt: Die Realisierung der eigentlich valenzgebundenen lokalen Adverbial­bestimmung $h\"{a}ngt$ eng mit den konzeptuellen Prozessen ($Lokalisierungs-proze{\ss}\;vs.\;Delokalisierungsproze{\ss}$) zusammen. Falls $Lokalisierungs-proze{\ss}$ stattfindet, ist die Realisietung der lokalen Adverbialbestimmung notwendig, um die Direktionalisierung des Verweisobjekts im Hinblick auf das Bezugsobjekt zu bezeichnen. Bei $Delokalisierungsproze\ss$ ist die Realisierung der lokalen Adverbialbestimung dagegen optional.