ͳȭа++̹
ڵα
| contents
ϹݰԽ
Q&AԽ
S/W
͵ | study
ȯ
Ϲȭ
ȭϹ
ȭǹ
꿡
۾
:
ID
:
¥
: 00-00-00 00:00
ȸ
: 16935
ȳϼ
ٽѹ 帮
ߴ ߰ ̰ŵ..
input 150A*100M,40--> 200A(1.8Kgf/cm)*1000mm
-->(25A*2M.4,65A*4M.4, 32A*3M.4,15A*5M.1)50 ̷ 12 ϴ.
α ɱ?
ߴ ⺻ . зµ ɸ1.8kgf/cm2ܿ ٸ ڰŵ
ڼϰ ˼ ?
ϴ..
00-00-00 00:00
Ƹ ū ̶ ܱ мʿ ̴ϴ. ȭо
о߿ ã .
ٸ û Ͻñ ٶϴ. å A4 ũ 100
ȵǴ åԴϴ.
Ʈ̴ Դϴ.
>> Pipe α ۼ ε, ʿ å . ͳ ƹ ˻ .
>> Crane Valve Ȩ ũ fatbrain amazon .
>> dz, , ο ... ڴ ִ ּ...
Ƹ ū ̶ ܱ мʿ ̴ϴ. ȭо о߿ ã . ٸ û Ͻñ ٶϴ. å A4 ũ 100 ȵǴ åԴϴ. Ʈ̴ Դϴ. >> Pipe α ۼ ε, ʿ å . ͳ ƹ ˻ . >> Crane Valve Ȩ ũ fatbrain amazon . >> dz, , ο ... ڴ ִ ּ...
׳
׳
00-00-00 00:00
μ Ű...
(ִ°) ..Ʋ ֽϴ.
Ʈ̴ Դϴ.
>> Pipe α ۼ ε, ʿ å . ͳ ƹ ˻ .
>> Crane Valve Ȩ ũ fatbrain amazon .
>> dz, , ο ... ڴ ִ ּ...
μ Ű... (ִ°) ..Ʋ ֽϴ. Ʈ̴ Դϴ. >> Pipe α ۼ ε, ʿ å . ͳ ƹ ˻ . >> Crane Valve Ȩ ũ fatbrain amazon . >> dz, , ο ... ڴ ִ ּ...
ֹּٶ
ֹּٶ
00-00-00 00:00
ȣ ϴ. ^^
Sch.NO = 1000*Ps/Ss
Ps = Safe Working Press [psig]
Ss = Safe Working Stress [lbf/in2]
輮 Դϴ.
>> ϴ noϴ ƽô
>> ˷ּ...
>>
ȣ ϴ. ^^ Sch.NO = 1000*Ps/Ss Ps = Safe Working Press [psig] Ss = Safe Working Stress [lbf/in2] 輮 Դϴ. >> ϴ noϴ ƽô >> ˷ּ... >>
Stefano
Stefano
00-00-00 00:00
Դϴ.
>> մϴ...
>>
>> ġ ӵ ϼ̴µ
>>
>> ϶ ̰ ֳ?
>>
>> ˰ ͽϴ...
>>
>> 亯 ø
>>
>> Ҹ ̶ Ұ ֽǼ ...
>>
>> 亯 ϸ Ź帱..
(1) SV(Space Velocity) ü ü (κ) ǥػ Ƿ Ÿ (ܼ) Ƿ մϴ. (Vol/time)/(Vol) = 1/(time) ϴ.
SV ̸̹ Ǯϸ "ԵǴ ð 귯 ִ°?" մϴ. ̸ Ẹ
SV = v/V (⼭ v , V )
(2) µ ǥػ° ƴϰ ⱸ Է ٸ ǰ Ϲ̱ SV Space Time( time) ȿ üϴ ð( üð, Ȥ ð) κ ٸϴ.
(3) ȯ (Ư ˸) Ǵ° ϱ Ͽ Ǵ SVԴϴ.
˸Ÿ ϴ ˸ Դ SV Ÿ 쵵 ؼ ϸ ˸ Ը Ƿ ȯؼ SV Ÿ ˴ϴ.
̷κ SV ˰ ũ V = v/(SV) ˴ϴ.
(4) Ҷ SV Ÿ ϴ°? ǹ̷ ؼǴµ..
, SV Ư и SV Ÿ 쿡 ο üϴ ð , ũ ӵ ȯ ũ Ǿϴ.
ϴ ( µ з) ߸ (˸) ֽϴ.
SV ϴ , Ͽ߸ մϴ.
(5) ٽ ϸ...( V, L) Ǵ Ṱ C (g/L, Ǵ mol/L), ü F (g/L, Ǵ mol/L), aи Fa(g/h, Ǵ mol/h), üе s(g/L, Ǵ mol/L) Ÿ F/s = Fa/C = v Ǿ ü Ƿ Ÿ v/V SV Ǵµ (̶ Ǵ ǥػ Ƿ Ÿ) ؼ Ǵ Volume Rate ̹ Ƚϴ.
, ٸ ȯ ؼ SV ؾ ϱ (ٽ ؼ ũ ) ̵ Ѵٴ ǹ̰ ϴ.
(6) Ȳ ٽ
"SV Ϸ ϴ Ǿ Ѵ." Դϴ.
SV Կ ־ κ Ѿ ̳ 迡 ־ ߿ Ұ ˴ϴ.
Ǿ⸦ ٶϴ.
Stefano/020222
Դϴ. >> մϴ... >> >> ġ ӵ ϼ̴µ >> >> ϶ ̰ ֳ? >> >> ˰ ͽϴ... >> >> 亯 ø >> >> Ҹ ̶ Ұ ֽǼ ... >> >> 亯 ϸ Ź帱.. (1) SV(Space Velocity) ü ü (κ) ǥػ Ƿ Ÿ (ܼ) Ƿ մϴ. (Vol/time)/(Vol) = 1/(time) ϴ. SV ̸̹ Ǯϸ "ԵǴ ð 귯 ִ°?" մϴ. ̸ Ẹ SV = v/V (⼭ v , V ) (2) µ ǥػ° ƴϰ ⱸ Է ٸ ǰ Ϲ̱ SV Space Time( time) ȿ üϴ ð( üð, Ȥ ð) κ ٸϴ. (3) ȯ (Ư ˸) Ǵ° ϱ Ͽ Ǵ SVԴϴ. ˸Ÿ ϴ ˸ Դ SV Ÿ 쵵 ؼ ϸ ˸ Ը Ƿ ȯؼ SV Ÿ ˴ϴ. ̷κ SV ˰ ũ V = v/(SV) ˴ϴ. (4) Ҷ SV Ÿ ϴ°? ǹ̷ ؼǴµ.. , SV Ư и SV Ÿ 쿡 ο üϴ ð , ũ ӵ ȯ ũ Ǿϴ. ϴ ( µ з) ߸ (˸) ֽϴ. SV ϴ , Ͽ߸ մϴ. (5) ٽ ϸ...( V, L) Ǵ Ṱ C (g/L, Ǵ mol/L), ü F (g/L, Ǵ mol/L), aи Fa(g/h, Ǵ mol/h), üе s(g/L, Ǵ mol/L) Ÿ F/s = Fa/C = v Ǿ ü Ƿ Ÿ v/V SV Ǵµ (̶ Ǵ ǥػ Ƿ Ÿ) ؼ Ǵ Volume Rate ̹ Ƚϴ. , ٸ ȯ ؼ SV ؾ ϱ (ٽ ؼ ũ ) ̵ Ѵٴ ǹ̰ ϴ. (6) Ȳ ٽ "SV Ϸ ϴ Ǿ Ѵ." Դϴ. SV Կ ־ κ Ѿ ̳ 迡 ־ ߿ Ұ ˴ϴ. Ǿ⸦ ٶϴ. Stefano/020222
....
....
00-00-00 00:00
õƴ Դϴ.
>> ȳϼ? Ǹ̶ ȸ翡 ٴϴ õ̶ մϴ.
>> ٸ ƴ϶, Ǹ ȭ ϴ test Fuel resistance ϴ ֽϴ.
>>
>> ̶ ϴ Fuel C ǥǾ ִ ִ..
>> ڼ ˰ ͽϴ.
>>
>> ASTM method D-471̶ ϴ..
>>
>> ̿ ڼ Ź帳ϴ.
>>
>> ƿ, ִ ˸ ڱ.
>>
>> մϴ.
>>
>> ȸźŹ帳ϴ.
>> ȸ ǥѹٿ
jchun@dysil.co.kr
Ź帳ϴ.
>>
.... astm ǥ ˰ ֽϴ. ǿ ϴµ װͿ ǥ .
fuel c ϸ...... װ ȸ翡 ˰?
ǥ ϴ е ˰ڱ. 밳 ȸ翡 ȭ ǰ ̴ ؼ ϰ ǥϴ 찡 Ƽ... fuel c ڳ.
õƴ Դϴ. >> ȳϼ? Ǹ̶ ȸ翡 ٴϴ õ̶ մϴ. >> ٸ ƴ϶, Ǹ ȭ ϴ test Fuel resistance ϴ ֽϴ. >> >> ̶ ϴ Fuel C ǥǾ ִ ִ.. >> ڼ ˰ ͽϴ. >> >> ASTM method D-471̶ ϴ.. >> >> ̿ ڼ Ź帳ϴ. >> >> ƿ, ִ ˸ ڱ. >> >> մϴ. >> >> ȸźŹ帳ϴ. >> ȸ ǥѹٿ jchun@dysil.co.kr Ź帳ϴ. >> .... astm ǥ ˰ ֽϴ. ǿ ϴµ װͿ ǥ . fuel c ϸ...... װ ȸ翡 ˰? ǥ ϴ е ˰ڱ. 밳 ȸ翡 ȭ ǰ ̴ ؼ ϰ ǥϴ 찡 Ƽ... fuel c ڳ.
....
....
00-00-00 00:00
Ǫ Դϴ.
>> µ..lbs lb ּ
.... ÷ . lbs.... װ ..
밳 lb Űϰ Ż糪 .( ...^^;;)
̷ ֽϴ. lbf, lbm ϴ . ڴ ̰, ڴ Ÿϴ. ׳ lb ϸ Ÿϴ.
ȭ å ø ڼ ֽ.
ȭ л Ѵ ̾. ū ...
ȭ ϰ ȭи ̳ ų Դϴ. ϼ.
Ǫ Դϴ. >> µ..lbs lb ּ .... ÷ . lbs.... װ .. 밳 lb Űϰ Ż糪 .( ...^^;;) ̷ ֽϴ. lbf, lbm ϴ . ڴ ̰, ڴ Ÿϴ. ׳ lb ϸ Ÿϴ. ȭ å ø ڼ ֽ. ȭ л Ѵ ̾. ū ... ȭ ϰ ȭи ̳ ų Դϴ. ϼ.
....
....
00-00-00 00:00
ϼ Դϴ.
>> 1̸ʹ Դϱ?
>> 亯 ٶϴ.
.... α. ڽ Ҷ ´ ǰ ־ մϴ. β ʰ ħ ° ±. ġ ", ˰ ִ° " ̷ Դϴ. .
Ѹ ϴ. ml Դϴ. ü Ǵ µ . ̷ ĵȴµ ؾ߰. .
ϼ Դϴ. >> 1̸ʹ Դϱ? >> 亯 ٶϴ. .... α. ڽ Ҷ ´ ǰ ־ մϴ. β ʰ ħ ° ±. ġ ", ˰ ִ° " ̷ Դϴ. . Ѹ ϴ. ml Դϴ. ü Ǵ µ . ̷ ĵȴµ ؾ߰. .
ϼ
ϼ
00-00-00 00:00
Ǿ .ѳ ؼ ...ȸǻȰ ɷ..Ѱ .м EC³?ϴ ؼ ġ Ĺ ִ Ǵ...о߰ ƴѰ? Ȥ..... 亯 Ź帳ϴ.
Ǿ .ѳ ؼ ...ȸǻȰ ɷ..Ѱ .м EC³?ϴ ؼ ġ Ĺ ִ Ǵ...о߰ ƴѰ? Ȥ..... 亯 Ź帳ϴ.
00-00-00 00:00
Ǽ!
.... Դϴ.
>> ϼ Դϴ.
>>
>> >> 1̸ʹ Դϱ?
>> >> 亯 ٶϴ.
>>
>> .... α. ڽ Ҷ ´ ǰ ־ մϴ. β ʰ ħ ° ±. ġ ", ˰ ִ° " ̷ Դϴ. .
>>
>> Ѹ ϴ. ml Դϴ. ü Ǵ µ . ̷ ĵȴµ ؾ߰. .
Ǽ! .... Դϴ. >> ϼ Դϴ. >> >> >> 1̸ʹ Դϱ? >> >> 亯 ٶϴ. >> >> .... α. ڽ Ҷ ´ ǰ ־ մϴ. β ʰ ħ ° ±. ġ ", ˰ ִ° " ̷ Դϴ. . >> >> Ѹ ϴ. ml Դϴ. ü Ǵ µ . ̷ ĵȴµ ؾ߰. .
....
....
00-00-00 00:00
ȫ Դϴ.
>>
>> ڴ ִ 亯 帳ϴ.
>>
>> HHV LHV ̿Ͽ ϰ
>> Ȯ Ǹ 帳ϴ.
>>
... ῭ ԵǸ HHV , ῭ Ե LHV Դϴ.
ڼ Ǵ Perry s Chemical Engineer s Handbook(p27-5, 7th Ed.) ֽϴ. ãƼ ñ.
ȫ Դϴ. >> >> ڴ ִ 亯 帳ϴ. >> >> HHV LHV ̿Ͽ ϰ >> Ȯ Ǹ 帳ϴ. >> ... ῭ ԵǸ HHV , ῭ Ե LHV Դϴ. ڼ Ǵ Perry s Chemical Engineer s Handbook(p27-5, 7th Ed.) ֽϴ. ãƼ ñ.
00-00-00 00:00
׳, .
5wt% KOH solution 100ml , KOHþ 100% ؼ....
1. KOH 緮( 5g Ѿ߰?) ˷
2. 쿡 ְ 1ð Ų.
3. ̰ ٽ ȿ .
( : Ⱑ Ŵ)
4. £ 5g Ȯ ĪѴ.
5. 100ml öũ
6. £ 100g ä.
(KOH 5g + Demi water 95g)
7. öũ δ.
, ϰ ͵ . ؼ ^^
Ʈϴ³Ѵ Դϴ.
>> 5%KOH ¹ ƽø ּ..
>> KOH° ϰ ¹ ֽø
>> ٽϴ..
>> ϴµ ˾ƾ߾...ѤѤ
׳, . 5wt% KOH solution 100ml , KOHþ 100% ؼ.... 1. KOH 緮( 5g Ѿ߰?) ˷ 2. 쿡 ְ 1ð Ų. 3. ̰ ٽ ȿ . ( : Ⱑ Ŵ) 4. £ 5g Ȯ ĪѴ. 5. 100ml öũ 6. £ 100g ä. (KOH 5g + Demi water 95g) 7. öũ δ. , ϰ ͵ . ؼ ^^ Ʈϴ³Ѵ Դϴ. >> 5%KOH ¹ ƽø ּ.. >> KOH° ϰ ¹ ֽø >> ٽϴ.. >> ϴµ ˾ƾ߾...ѤѤ
Ʈ
Ʈ³
00-00-00 00:00
˷,,ʹ ??
б ž..
б ȭ 赵 ߾...
̴ Դϴ.
>> ׳, .
>> 5wt% KOH solution 100ml , KOHþ 100% ؼ....
>>
>> 1. KOH 緮( 5g Ѿ߰?) ˷
>> 2. 쿡 ְ 1ð Ų.
>> 3. ̰ ٽ ȿ .
>> ( : Ⱑ Ŵ)
>> 4. £ 5g Ȯ ĪѴ.
>> 5. 100ml öũ
>> 6. £ 100g ä.
>> (KOH 5g + Demi water 95g)
>> 7. öũ δ.
>>
>> , ϰ ͵ . ؼ ^^
>>
>>
>>
>>
>>
>> Ʈϴ³Ѵ Դϴ.
>>
>> >> 5%KOH ¹ ƽø ּ..
>> >> KOH° ϰ ¹ ֽø
>> >> ٽϴ..
>> >> ϴµ ˾ƾ߾...ѤѤ
˷,,ʹ ?? б ž.. б ȭ 赵 ߾... ̴ Դϴ. >> ׳, . >> 5wt% KOH solution 100ml , KOHþ 100% ؼ.... >> >> 1. KOH 緮( 5g Ѿ߰?) ˷ >> 2. 쿡 ְ 1ð Ų. >> 3. ̰ ٽ ȿ . >> ( : Ⱑ Ŵ) >> 4. £ 5g Ȯ ĪѴ. >> 5. 100ml öũ >> 6. £ 100g ä. >> (KOH 5g + Demi water 95g) >> 7. öũ δ. >> >> , ϰ ͵ . ؼ ^^ >> >> >> >> >> >> Ʈϴ³Ѵ Դϴ. >> >> >> 5%KOH ¹ ƽø ּ.. >> >> KOH° ϰ ¹ ֽø >> >> ٽϴ.. >> >> ϴµ ˾ƾ߾...ѤѤ
....
....
00-00-00 00:00
ȭ Դϴ.
>>
>> ȲŻ ΰ?
>> ϴ ˷ּ...
>> ~~~~~
>>
.... ƽ.... Դϴ. ȲŻ̶...Ƹ ȭп ٳ, ˸ ˹ Ȳ ߿ ...
Ϸ ټ ð ʿ .
п ذ ʼԴϴ. ȭ ⺸ٴ Ƶ л ϴ ϳԴϴ. ܿ ġ, װ ȵǰŵ. , ϱ . Դٰ Ȳ ӵ ɷ ˰ ֽϴ. ̳, ش Ͼ ϴ° ɷ ˴ϴ.
ȭ Դϴ. >> >> ȲŻ ΰ? >> ϴ ˷ּ... >> ~~~~~ >> .... ƽ.... Դϴ. ȲŻ̶...Ƹ ȭп ٳ, ˸ ˹ Ȳ ߿ ... Ϸ ټ ð ʿ . п ذ ʼԴϴ. ȭ ⺸ٴ Ƶ л ϴ ϳԴϴ. ܿ ġ, װ ȵǰŵ. , ϱ . Դٰ Ȳ ӵ ɷ ˰ ֽϴ. ̳, ش Ͼ ϴ° ɷ ˴ϴ.
....
....
00-00-00 00:00
ŸϾƴ Դϴ.
>> ҷ 2 ִٰ
>>
>> İ ڽ ˰ ͽϴ
>>
>> ҷ ϴµ ˸Ŵ ˰ͽϴ
>>
>> !! ּ!! ۿ ϴ!!!
>>
>> pմ
>>
>>
>>
>>
.... ô Ʈ ô° ...
ȭ Ʈ Դϴ. м ڽ̳ ȭ Ʈ ˾ƺ.
ŸϾƴ Դϴ. >> ҷ 2 ִٰ >> >> İ ڽ ˰ ͽϴ >> >> ҷ ϴµ ˸Ŵ ˰ͽϴ >> >> !! ּ!! ۿ ϴ!!! >> >> pմ >> >> >> >> .... ô Ʈ ô° ... ȭ Ʈ Դϴ. м ڽ̳ ȭ Ʈ ˾ƺ.
ŸϾ
ŸϾ
00-00-00 00:00
.... Դϴ.
>> ŸϾƴ Դϴ.
>>
>> >> ҷ 2 ִٰ
>> >>
>> >> İ ڽ ˰ ͽϴ
>> >>
>> >> ҷ ϴµ ˸Ŵ ˰ͽϴ
>> >>
>> >> !! ּ!! ۿ ϴ!!!
>> >>
>> >> pմ
>> >>
>> >>
>> >>
>> >>
>> .... ô Ʈ ô° ...
>> ȭ Ʈ Դϴ. м ڽ̳ ȭ Ʈ ˾ƺ.
ְ ֽ... ʹϽô
..
.... Դϴ. >> ŸϾƴ Դϴ. >> >> >> ҷ 2 ִٰ >> >> >> >> İ ڽ ˰ ͽϴ >> >> >> >> ҷ ϴµ ˸Ŵ ˰ͽϴ >> >> >> >> !! ּ!! ۿ ϴ!!! >> >> >> >> pմ >> >> >> >> >> >> >> >> >> .... ô Ʈ ô° ... >> ȭ Ʈ Դϴ. м ڽ̳ ȭ Ʈ ˾ƺ. ְ ֽ... ʹϽô ..
....
....
00-00-00 00:00
ŸϾƴ Դϴ.
>> .... Դϴ.
>>
>> >> ŸϾƴ Դϴ.
>> >>
>> >> >> ҷ 2 ִٰ
>> >> >>
>> >> >> İ ڽ ˰ ͽϴ
>> >> >>
>> >> >> ҷ ϴµ ˸Ŵ ˰ͽϴ
>> >> >>
>> >> >> !! ּ!! ۿ ϴ!!!
>> >> >>
>> >> >> pմ
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> .... ô Ʈ ô° ...
>> >> ȭ Ʈ Դϴ. м ڽ̳ ȭ Ʈ ˾ƺ.
>>
>> ְ ֽ... ʹϽô
>>
>> ..
.... ´ٰ ؼ ȴ ʹ ϴٴ... и ȭ Ʈ ƴϰ ȭƮ Դϴ. ü ߸ȰŶ ñ. ̱. ã ̸ ģ Ʈ 賢.
ŸϾƴ Դϴ. >> .... Դϴ. >> >> >> ŸϾƴ Դϴ. >> >> >> >> >> ҷ 2 ִٰ >> >> >> >> >> >> İ ڽ ˰ ͽϴ >> >> >> >> >> >> ҷ ϴµ ˸Ŵ ˰ͽϴ >> >> >> >> >> >> !! ּ!! ۿ ϴ!!! >> >> >> >> >> >> pմ >> >> >> >> >> >> >> >> >> >> >> >> >> >> .... ô Ʈ ô° ... >> >> ȭ Ʈ Դϴ. м ڽ̳ ȭ Ʈ ˾ƺ. >> >> ְ ֽ... ʹϽô >> >> .. .... ´ٰ ؼ ȴ ʹ ϴٴ... и ȭ Ʈ ƴϰ ȭƮ Դϴ. ü ߸ȰŶ ñ. ̱. ã ̸ ģ Ʈ 賢.
Chem.
Chem.
00-00-00 00:00
.... Դϴ.
>> ȭ Դϴ.
>>
>> >>
>> >> ȲŻ ΰ?
>> >> ϴ ˷ּ...
>> >> ~~~~~
>> >>
>> .... ƽ.... Դϴ. ȲŻ̶...Ƹ ȭп ٳ, ˸ ˹ Ȳ ߿ ...
>> Ϸ ټ ð ʿ .
>> п ذ ʼԴϴ. ȭ ⺸ٴ Ƶ л ϴ ϳԴϴ. ܿ ġ, װ ȵǰŵ. , ϱ . Դٰ Ȳ ӵ ɷ ˰ ֽϴ. ̳, ش Ͼ ϴ° ɷ ˴ϴ.
ϴ D.V.S ȭȲ Żӵ ´ٸ ӵ Ѱ̸ δ SO2 + 1/2O --> SO3 ϴ..̷ ˸Ź Ȳ մϴ.
ӵ ˸ Ż ˴ϴ. Ϲ vanadia and Posstium sulfate silicaǥ鿡 impregnation ˴ϴ.
ӵ ð õ ̹Ƿ ȭа Ȳ Ǵ ˸Ÿ Oø ϴ.
̶ ִ å ..
.... Դϴ. >> ȭ Դϴ. >> >> >> >> >> ȲŻ ΰ? >> >> ϴ ˷ּ... >> >> ~~~~~ >> >> >> .... ƽ.... Դϴ. ȲŻ̶...Ƹ ȭп ٳ, ˸ ˹ Ȳ ߿ ... >> Ϸ ټ ð ʿ . >> п ذ ʼԴϴ. ȭ ⺸ٴ Ƶ л ϴ ϳԴϴ. ܿ ġ, װ ȵǰŵ. , ϱ . Դٰ Ȳ ӵ ɷ ˰ ֽϴ. ̳, ش Ͼ ϴ° ɷ ˴ϴ. ϴ D.V.S ȭȲ Żӵ ´ٸ ӵ Ѱ̸ δ SO2 + 1/2O --> SO3 ϴ..̷ ˸Ź Ȳ մϴ. ӵ ˸ Ż ˴ϴ. Ϲ vanadia and Posstium sulfate silicaǥ鿡 impregnation ˴ϴ. ӵ ð õ ̹Ƿ ȭа Ȳ Ǵ ˸Ÿ Oø ϴ. ̶ ִ å ..
Copyright 1999.07.10-Now ChemEng.co.kr & 3D System Engineering. (mail : ykjang@naver.com, call 010-4456-8090)