불순물 첨가 BGO 섬광체 단결정의 육성과 열형광 특성

김성철,김중환,김종일,정중현,도시홍,김기동,이대원 동의대학교 기초과학연구소 1996 基礎科學硏究論文集 Vol.6 No.1

Eu or Fe doped BGO scintillation crystals were grown by Czochralski method. In order to get information about traps in the grown BGO crystals, we measured trap parameters including activation energy, frequency factor and the kinetic order of thermoluminescence, and compared such parameters with thermoluminescent characteristics of pure BGO scintillation crystals. In addition, optical transmittance of the grown BGO crystals was measured.

우리나라 논 관개용 지하수 수질 특성

김진호,조광래,임수정,이경자,경기천,엄미정,김희권,김찬용,이영한,이신찬,윤순강 한국환경농학회 2003 한국환경농학회지 Vol.22 No.4

This study was carried out to evaluate the status of the groundwater quality for paddy fields irrigation in Korea. Water samples were collected at 130 sites throughout the country. Samples were collected at three seasons-April, July and October-in 2000. According to our survey, the groundwater was found to be suitable for irrigation purpose. Average EC was shown 0.286 dS/m. Nitrate-nitrogen and Cl^(-) concentration was 5.6 ㎎/L, 32.95 ㎎/L which satisfied the Korean Standards for Irrigation Water. Nitrate-nitrogen concentration in each province was shown as following orders: Jeju (11.17 ㎎/L) > Chungnam (8.16 ㎎/L) > Gyeongbuk (6.64 ㎎/L) > Gyounggi (5.91 ㎎/L) > Chungnam (4.95 ㎎/L) > Gyeongnam (3.91 mgk) > Jeonbuk (3.50 ㎎/L) > Jeonnam (3.27 ㎎/L) > Gangwon (2.91 ㎎/L). The concentration by sampling seasons were October (6.62 ㎎/L) > July (5.88 mg&) > April (4.78㎎/L). As the soil of Jeju Province is usually derived from volcanic ash soils mainly used for upland drops, it may influence the nitrate-nitrogen concentration of groundwater. The amount of rainfall also influence the water quality. But the COD_(Cr), were shown April (3.17㎎/L) > July (2.91 ㎎/L) > October (2.40 ㎎/L), it is highly related in the basal dose of organic matter fertilizers. This study demonstrated that groundwater quality was suitable for irrigation, but continuous monitoring is recommended for agricultural policy and developing OECD agricultural environment indicators.

특수 언어발달 장애 환아의 임상 및음향음성학적 특성연구

김연희,박세훈,신용일,김찬양,김현기,김정수 大韓再活醫學會 2000 Annals of Rehabilitation Medicine Vol.24 No.1

교잡종 찰옥수수에 대한 연구 : Ⅰ. 찰옥수수 "연농×재래" 교잡종의 생육 및 수량특성 Ⅰ. Growth and Yield Characteristics in Waxy Maize Hybrid Yeonnong × Jaerae

이희봉,정재영,최현구,김기훈,김효기,주정일 충남대학교 농업과학연구소 2001 농업과학연구 Vol.28 No.2

재래종 찰옥수수 F₁ 교잡종에 대한 생육 및 수량비교를 위해 충남대학교 농과대학 실험포장에서 육성한 이들 교잡종의 식물학적 특성에 대한 연구 결과는 다음과 같다. 1. 간장은 대조구에 비해 대학찰×재래찰, FR805/1K₃×고령찰이 가장 크게 나타났으나, FR805/1K₃×대학찰, 찰옥 1호에서 대조구와 비슷하게 나타내었다. 2. 착수수는 간장에서와 마찬가지로 대학찰×재래찰, FR805/1K₃×고령찰이 대조구보다 높게 나타났으나 대학찰×재래찰, 찰옥 1호는 비슷하였다. 3. 분얼수는 각 교잡종들간에 큰 차이가 없었다. 4. 이삭의 길이는 대조구에 비해 교잡종들이 거의 2배이상의 크기를 나타내었다. 5. 이삭직경은 FR805/1K₃× 고령찰의 교잡종을 제외하고 대조구와 비슷하게 나타났다. 6. 이삭열수는 Daehakchal×1K₁/LE만이 대조구와 유의성을 나타내고 기타 교잡종은 대조구와 비슷하였다. In order to evaluate the characteristics of growth and yield in F_(1) waxy hybrids using Korean local maize lines, six hybrids including check, Chalok # 1, were planted at the experinental field of e Chungnam National University. Stem and ear heights of Yeonnong × Jaerae and FR805/IK_(3) × Koryong hybrids were higher than the check hybrid. Number of fillers per plant in all hybrids were similar as 0.3 to 0.5 per plant Ear length of waxy hybrids was longer than 15㎝ of check hybrid and ear diameter was also thicker than check except FR805/IK_(3) × Koryong waxy hybrid. A final result, Yeonnong × Jaerae among hybrids was comparatively superior to other hybrids in the test.

청각 자극용 전기자극기 개발

허승덕,정동근,김리석,김광년,강명구,김재룡,김기련 한국음성과학회 2004 음성과학 Vol.11 No.3

This paper introduces a development of an electrical stimulator for auditory stimulation. The electrical stimulator is useful in neurotological diagnosis, audiological evaluation, candidate selection for cochlear implantation, optimal device selection and decision making of MAP strategy for severe-to-profound hearing impaired persons. The development was based on sound parameters of auditory brainstem responses and auditory electrophysiological characteristic such as effective firing of auditory nerve and recording evoked potentials during refractory period of neuron. Besides pulse parameter could adjustable by programming for more varied electrical stimulation evoked response audiometry. Using the electrical stimulator, electrical square pulse was applied to promontory, and electrically evoked auditory brainstem response and electrically middle latency response were successfully recorded in cats.

축산분뇨 혐기소화 잔재물의 특성 및 초지 적용성 평가

김승민(Seung Min Kim),정웅기(Woong-gi Jung),성용주(Yong Joo Sung),안희권(Hee-Kwon Ahn),김동성(Dong Sung Kim),윤도현(Do-Hyun Yoon),김동섭(Dong-Seop Kim1),정광화(Hwa Gwang Jung) 한국펄프·종이공학회 2014 펄프.종이기술 Vol.46 No.3

Pentaethlenehexamine XAD-4 수지를 이용한 금속이온의 흡착 및 분리에 관한 연구

김선덕,정원규,장기호 大邱大學校附設 基礎科學硏究所 1988 基礎科學硏究 Vol.5 No.-

The new chelating resin Pentaethylenehexamine XAD-4 was synthesized by the reaction of Amberlite XAD-4 resin and the chelate reagent Pentaethylenehexamine. The newly prepared resin contained 0.75 mmol of Pentaethylenehexamine per gram of resin and showed weak base behavior in aqueous solutions. The capacity of adsorption of metal ions are Mg(II) 1.0×10-³, Ca(II) 1.95×10-¹, Sr(II) 2.14×10-¹, Ba(II) 2.54×10-¹, Cu(II) 7.2×10-¹, Ni(II) 2.50×10-¹, Zn(1l) 2.11×10-¹, Co(II) 2.01×10-¹, m mol per gram of the chelating resin. Also, the elution order of the alkaline-earth metal ion Mg(II), Ca(Il), Sr(II), follow by Ba(II), and for the transition metal ions are eluted to Co (II), Zn(II), Ni(II), and Cu(II) in order.

會計規制의 本質과 經濟的 結果에 관한 硏究

金東律,朴基丁 釜山外國語大學校貿易經營硏究所 1987 貿易經營論集 Vol.3 No.-

Accounting regulation refers to explicit legislative and adminstrative controls over the process of selection of specific alternative reporting method,measurement systems, and disclosure techniques form among all that might be available for financial reporting by business enterprises. The fundamental dispute over regulation has been between those who consider and it is necessary that those who do not. The grounds for rupporting segulation is that there is economic disequilibrium. On the other hand, those who consider that regulation is not necessary contend that it entails costs being incurred by information producers; that these are not justified in terms of the pricing mechanism for securities; and that mechamisms already exist for adequate disclosure of an assumption that some regulation of the providers of financial information is necessary. Accounting regulation is viewed in terms of conceptual framework and then in terms of political process. Conceptual framework views involve continuing basically along present lines with the hope that the conceptual framework will provide a pursuasive justification for the present accounting regulation and an operational guidline for the future accounting regulation. This conceptual framework has either been the traditional one of the true income or the more recent one of decision-usefulness. The proponents of the former see accounting as finanical mapmaking and accounts as maps. The better map, the more completely it represents the complex phenomena that are being mapped. On the other hand, the proponents of the decision-usefulness approach attach more importance to the function the accounts perform than the appropriate measures to represent events. They argue that financial reporting should provide information that is useful to present and potential investors and creditors and other users in making rational investment, credit, and similar decisions. An alternative view is that accounting must be seen as political process. This view is opposed to the above view that the problems of accounting can be soived by the exploration and adoption of a conceptual framework. Those who have discussed accounting regulation as constrained by political processes are partitioned into those who contend that regulation should be political and those who contend that it can only be political. they imply That the different interests of different parties lead to the conclusion that, since an optimal solution of the the incompatibilities between them is infeasible, some political solution is required. The self-interes perspective is characterised by its focus upon the self-interests of individuals. From the self-interest perspective the existence of any such criteria is regarded primarily as a political as opposed to a rational outcome, as it is seen to be the result of power struggles between individuals pursuing irreconcilably different self-interests. In contrast, the worldview perspective focusses upon individuals' affiliation to shared values or ways of seeing. The self-interest perspective and the worldview perspective in relation to the actions of three parties involved in accounting regulation : companies, firms of accountants, and standard setting bodies are evaluated. First, in respect to companies-the providers of information-it is suggested that the worldview approach is richer because it appreciates that managers may express a range of views when making representation on behalf of industry. Sccond, in respect to firms of accountants the inadeauacy of self-interests perspective is found to be even more apparent because they have consistently supported information users, not their clients, information providers. Finally in respect to the standard setting bodies it is submitted that their support of user needs is better understood by reference to their past conditioning and present beliefs than in term of any self-interested concern to satisty user needs. However, the worldview perspective appears limited in two respects. In conclusion, economic consequences that affect specific industries, individuals, or corporations cannot be ignored and individuals and corporations should have an opportunity to be heard.

폭발접합시의 충돌속도 및 경도해석에 관한 연구

金靑均,文正基 弘益大學校 科學技術硏究所 1992 科學技術硏究論文集 Vol.2 No.-

One of the most important parameters for explosive welding is flyer velocity(??), which principally depends on momentum aparted from detonation of the explosive. And close dependency with other parameters such as dynamic angle(β), impact pressure(??), charge ratio(R), flyer thickness(??) and stand-off distance(d), should be taken accounts for welding design. This paper describes, as a result of experiment, some empirical equation related to relation between ?? and R. The value of ?? equals to ?? can be used on ordinary experiment, seems to be better accuracy than any other investigators.

웨이블릿 변환과 GPS 정밀시각동기를 이용한 전력계통 고장점 모니터링 시스템에 관한 연구

김기택,김혁수,최정용 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.A

A continuous and reliable electrical energy supply is the objective of any power system operation. A transmission line is the part of the power system where faults are most likely to happen. This paler describes the use of wavelet transform for analyzing power system fault transients in order to determine the fault location. Synchronized sampling was made possible by precise time receivers based on GPS time reference, and the sampled data were analyzed using wavelet transform. This paper describes a fault location monitoring system and fault locating algorithm with GPS, DSP processor, and data acquisition board, and presents some experimental results and error analysis.