자연 암석에서 나타나는 주기적침전반응의 화학적 연구

전상호,한미애,Jun, Sang-Ho,Han, Mi-Ae 대한자원환경지질학회 2007 자원환경지질 Vol.40 No.4

본 연구는 구과상암 형성의 원리로 알려진 리제강 현상을 화학적으로 실험하여 분석한 것으로 매질의 종류에 따라, 또한 내부전해질과 외부전해질이 바뀌었을 때 같은 리제강 링의 형태가 다르게 나타났다. 매질의 종류로는 한천, 젤라틴, 청포묵을 사용하였으며 한천은 1%, 젤라틴은 2%, 그리고 청포묵은 5%를 포함하여 0.01M 내부전해질 용액을 만들어 12시간동안 실온에서 굳혔을 때 외부전해질의 확산을 실험하기에 적절한 점성도를 유지하였으며 리제강 고리가 각 화학성분의 특성에 따라 선명하게 형성되는 현상을 볼 수 있었다. 용해도곱상수($K_{sp}$)가 $7.9{\times}10^{-9}$는 내부전해질 0.01M KI와 외부전해질 25% $Pb(NO_3){_2}$가 반응하여 생성한 리제강 링 간격이 0.01cm에서 0.12cm로 좁지만 점점 커지는 반면, 가 $8.3{\times}10^{-17}$는 내부전해질 0.01M KI와 외부전해질 25% $AgNO_3$이 반응하여 생성한 리제강 링간 간격은 0.7cm에서 0.45cm로 점점 작아지는 것으로 보아 화학적으로 리제강 링의 생성에서 링 간의 간격이나 전체 링의 생성 크기는 침전 물질의 용해도곱상수와 상관관계가 있는 것으로 나타났다. This study conducted a chemical experiment on the Leisegang phenomenon, which is known to be the principle of rhyolite formation, and analyzed the results. Even if the same chemical elements precipitated, the shape of Leisegang rings was different according to the condition of medium and depending on inner electrolyte and outer electrolyte. The experiment used agar, gelatin and mung-bean jelly as media. We prepared 0.01M inner electrolyte containing agar 1%, gelatin 2% and mung-bean jelly 5% and curdled the solution at room temperature for 12 hours and, as a result, we obtained viscosity optimal for experimenting on the diffusion of outer electrolyte, and Leisegang rings appeared clearly according to the characteristic of each chemical element. In $PbI_2$ with solubility product($K_{sp}$) of $7.9{\times}10^{-9}$ the intervals of Leisegang rings caused by the reaction of inner electrolyte 0.01M KI and outer electrolyte 25% $Pb(NO_3){_2}$ were narrow between 0.01cm and 0.12cmm but increased gradually, but in with of $8.3{\times}10^{-17}$ the intervals of Leisegang rings caused by the reaction of inner electrolyte 0.01M KI and outer electrolyte 25% $AgNO_3$ were between 0.7cm and 0.45cm and decreased gradually. This suggests that, in the chemical formation of Leisegang rings, the interval and size of the rings are correlated with the solubility product of the precipitates.

치조열 골이식

전상호,정영수,Jun, Sang-Ho,Padwa, Bonnie L.,Jung, Young-Soo 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.3

Bone grafting the alveolar cleft allows for stability and continuity of the dental arch, provides bone for eruption of permanent teeth or placement of dental implants, and gives support to the lateral ala of the nose. Closure of residual oronasal fistula can occur simultaneously. Repair of alveolar clefts can occur at a variety of stages defined as primary, early secondary, secondary, and late. Most centers perform this surgery as secondary bone grafting. Autogenous bone provides osteogenesis, osteoinduction and conduction and is recommended for grafting to the cleft alveolus and several donor sites are available. The surgeon should select the best flap design considering the amount of mucosa available, blood supply and tension-free closure, and the extent of the oronasal communication. The authors provide a comprehensive understanding of alveolar clefts and their repair by reviewing the historical perspective, objectives for treatment, timing, source of graft, presurgical orthodontics, surgical techniques, postoperative care, and complications.

소양호 퇴적물에 함유된 인의 존재형태와 용출가능성에 대하여

전상호,박용안 ( Sang Ho Jun,Young Ahn Park ) 한국하천호수학회 1989 생태와 환경 Vol.22 No.3

Fractional composition and mobility of sediment phosphorus in Lake Soyang are investigated. The fractional scheme was made for four chemically defined phosphorus forms as adsorbed phosphorus, non apatite inorganic phosphorus (NAI-P), apatite phosphorus and residual phosphorus. These forms were measured by chemical extraction technique. The most abundant fraction is residual phosphorus and the secondly abundant form NAI-P, and thirdly apatite phosphorus, and finally adsorbed phosphorus. The most efficient processes of scavenging of dissolved phosphours in the lake are biological uptake and chemical complexation. To evaluate the effects of pH on the mobility of sediment phosphorus, incubation experiments under aerobic and different pH condition of leaching solution are accomplished. The results show the pH of the leaching solution has strong influence on the release of sediment phosphorus and increases of leaching in high pH are more apparent in the NAI-P rich sediments than those in the residual P rich sediments.

실물 모형 강상판 접합상세부의 피로강도에 관한 실험적 연구

전상호(Jun Sang Ho),이문규(Lee Moon Kyu),정태주(Chung Tae Ju),박영석(Park Young Suk) 대한토목학회 2000 대한토목학회 학술발표회 논문집 Vol.2000 No.1

초저전력 기회 컴퓨팅을 실현하기 위한 하이브리드 LF/RF 구조 설계

전상호(Sang Ho Jun),조형곤(Hyeong Gon Jo),강순주(Soon Ju Kang) 한국통신학회 2012 한국통신학회 학술대회논문집 Vol.2012 No.11

한강 퇴적물에 함유된 오염물질의 존재형태와 이동성에 관한 연구 - 팔당호 퇴저굴의 인과 중금속을 중심으로 -

전상호 ( Sang Ho Jun ) 한국하천호수학회 1990 생태와 환경 Vol.23 No.1

Fractional composition and mobility of sediment phosphorus and some heavy metals in Lake Paldang are investigated. The fractional scheme for sediment phosphorus was made for four chemically defined phosphorus forms as adsorbed phosphorus, non. apatite inorganic phosphorus (NAI-P), apatite phosphorus and organic phosphorus (residual P) (Hieltjes and Lijklema, 1980). The most abundant fraction of the sediment phosphorus is NAI-P and secondly organic fraction, thirdly abundant apatite fraction. Adsorbed fraction is minor part of the total phosphorus. Mobilization of sediment phoshorus in Lake Paldang is most likely to occur when the pH increases or oxygen depleted in bottom water. The most abundant fraction of the sediment metal is residual fraction in all metals investigated. Labile fraction of the sediment metals are 18.0 % of total Cu, 51.5% of total Zn, 45.3% of total Pb, and 18.8% of total Ni respectively. Most of labile fraction consists of carbonate fraction for Cu, reducible fraction for Zn, Pb and Ni. Mobilization of Cu is most likely to occur when pH decreases, and Zn, Pb and Ni when oxygen is depleted.

Immediate loading 부족한 성공률 5% 채우기

전상호(Sang-Ho Jun),안진수(Jin-Soo Ahn),류재준(Jae-Jun Ryu),권종진(Jong-Jin Kwon) 대한치과의사협회 2013 대한치과의사협회지 Vol.51 No.4

A titanium based screw shaped dental implant was first introduced by Branemark and a treatment protocol where the restoration of edentulous area by connecting abutment after the osseointegration of the titanium surface of the implant and surrounding bone structure has been proposed. Although this protocol is widely accepted as a standard up to date, the healing duration of 3-6 months as well as the need for provisional prostheses during this period present as a major drawback. Immediate loading has been accomplished through the advent of various implant designs, enforced surface treatments, diverse forms of abutment, and delicate surgical techniques together with the increase in demand from the patients. The success rate of the immediate loading technique has been first reported as 85.7% by Dr. Schnitman in 1990 which recently has been reported up to 100% in the case of immediate loading in single tooth by Dr. Kan. To ameliorate the success rate of immediate loading technique, selection of patients presenting a sound bone quality and quantity, acquiring primary stability through delicate surgical techniques and fabrication of prostheses which accounts for biological stabilities should all be taken into consideration. This presentation introduces the understanding of biological stability of immediate loading, various methods for measurement of stability and clinical cases regarding immediate loading technique..

시설재배 오이의 물 절약 관개시점 구명

전상호(Sang-Ho Jeon),허승오(Seung-Oh Hur),하상건(Sang-Keun Ha),전현정(Hyun-Jung Jun),한경화(Kyung-Hwa Han),조희래(Hee-Rae Cho),홍순달(Soon-Dal Hong) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.5

본 연구는 시설재배오이의 적정 관개시점의 평가를 통한 물 관리 방안을 설정하기 위하여 수행하였다. 경기도 연천군 전곡읍 소재의 오이 시설재배 농가에서 Tensiometer를 이용한 자동관개시스템을 구축하고, 이를 이용하여 관개시점이 15, 20, 30, 40 kPa인 4개의 처리구를 두어 일반농가의 관행 관개방법과 비교하여 오이의 생산력과 물의 이용효율을 평가하였다. 관개방법에 따른 오이과실의 수량과 당도는 통계학적 차이는 없었으나 15 kPa보다 20, 30 kPa, 관행 처리구에서 각각 수량이 6%, 7%, 9% 높게 나타냈으며, 과실의 당도는 30 kPa 처리구에서 가장 높은 값인 4.1°brix, 관행과 40 kPa에서 가장 낮은 값인 3.7 °brix를 나타냈다. 건물중은 30 kPa에서 가장 큰 값을 나타내었으며 15, 20, 30 40 kPa처리구의 식물체 수분함량은 92, 86, 85, 84%로 조사되었다. 오이의 생육 기간 중 사용된 관개량은 관행 > 15 kPa >20 kPa > 30 kPa > 40 kPa 순이었으며, 절수율은 관행을 기준으로 15 kPa 처리구에서 46%, 20 kPa 처리구에서 48%, 30 kPa 처리구에서 58%, 40 kPa 처리구에서 69%가 절약되었다. 1 kg의 과실을 생산하는데 사용되는 물이용률은 관행이 가장 비효율적이며, 관행에 비해 15, 20, 30, 40 kPa처리구가 관행구보다 36~67%정도 물이 적게 사용되었다. 과실수량과 당도 등에 처리별 유의한 차이가 없으므로 30~40 kPa수준으로 관개시점 설정 시 60%이상의 물절약이 가능 할 것으로 판단된다. This study was conducted to investigate effects of irrigation points on cucumber growth and water saving under greenhouse. Automatic irrigation system and tensiometers were installed at four plots to measure soil water tension and properties of irrigated water. Each plot was irrigated at different irrigation points; soil water tension of 15, 20, 30, and 40 kPa, respectively. Conventional irrigation plot without tensiometer was also investigated. The total yield and sugar contents of cucumber had no significant differences between plots. However, irrigated water volumes were saved most when irrigation points were 30, and 40 kPa. The two plots of 30, and 40 kPa treatments used about 60% less of irrigated water than the plot of conventional practice did. In conclusion, this research suggested that the optimum irrigation point for cucumber cultivation in greenhouse can be soil water tension of 30 kPa based on the results of overall cucumber quality, and Greenhouse water usage.

조직문화와 리더쉽의 적합성이 행동적 유효성에 미치는 영향에 관한 실증연구

전상호(Sang - Ho Jun),신용존(Yong - John Shin) 한국경영학회 1995 經營學硏究 Vol.24 No.4

In spite of increasing intersts on organizational culture since 1980, there are relatively few studies on the relationships between organizational culture and leadership. Most of existed researches place emphases on how the leader in an organization determines and changes the culture. However, the organization culture as the shared value and belief of organization members influences and restricts the leadership. So the leaderships fitted in the organization culture are demanded. If the leadership unfitted in the organization culture will affect negatively on the behavioral effectiveness. This study is an exploative research for finding whether the organizational culture is an important factor affecting the leadership. So this study, based on the contingency theory, finds out congruence between organizational culture and leadership, and examines fitness of organizational culture and leadership to behavioral effectiveness by using above congruence. For this purpose, this study has set up a model and hypotheses on the organizational culture, leadership, and behavioral effectiveness. After examining hypotheses, this study has founded that specipic types of organizational culture are significantly related with specipic types of leadership, so there is a congruence between types of organizational culture and leadership. Also, the organization with fitted types of organizational culture and leadership is higher than those with unfitted ones in organizational involvement and job satisfaction. Thus, this study has suggested that there needs the leadership for fitting organizational culture, and this fitness improves behavioral effectiveness in corporates.

한강 유역환경의 종합적 연구 (3) ( Ecological Studies of Han River System ) / 의암호 저니 (底泥)에 의한 상부 수층의 오염 가능성에 대하여

전상호(Sang Ho Jun),이해금(Hae Keum Lee),최규열(Kyu Yul Choi) 강원대학교 환경연구소 1986 한강유역조사보고서 Vol.- No.-